summaryrefslogtreecommitdiffstats
path: root/documentation/ref-manual/ref-variables.xml
blob: 4445ffb5a125caeaabebd066f8dcad069ae20ee4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"
[<!ENTITY % poky SYSTEM "../poky.ent"> %poky; ] >

<!-- Dummy chapter -->
<chapter id='ref-variables-glos'>

<title>Variables Glossary</title>

<para>
    This chapter lists common variables used in the OpenEmbedded build system and gives an overview
    of their function and contents.
</para>

<glossary id='ref-variables-glossary'>


    <para>
       <link linkend='var-ALLOW_EMPTY'>A</link>
       <link linkend='var-B'>B</link>
       <link linkend='var-CFLAGS'>C</link>
       <link linkend='var-D'>D</link>
       <link linkend='var-ENABLE_BINARY_LOCALE_GENERATION'>E</link>
       <link linkend='var-FILES'>F</link>
<!--               <link linkend='var-glossary-g'>G</link> -->
       <link linkend='var-HOMEPAGE'>H</link>
       <link linkend='var-IMAGE_FEATURES'>I</link>
<!--               <link linkend='var-glossary-j'>J</link> -->
       <link linkend='var-KARCH'>K</link>
       <link linkend='var-LAYERDEPENDS'>L</link>
       <link linkend='var-MACHINE'>M</link>
<!--               <link linkend='var-glossary-n'>N</link> -->
       <link linkend='var-OE_BINCONFIG_EXTRA_MANGLE'>O</link>
       <link linkend='var-P'>P</link>
<!--               <link linkend='var-glossary-q'>Q</link> -->
       <link linkend='var-RCONFLICTS'>R</link>
       <link linkend='var-S'>S</link>
       <link linkend='var-T'>T</link>
<!--               <link linkend='var-glossary-u'>U</link> -->
<!--               <link linkend='var-glossary-v'>V</link> -->
       <link linkend='var-WORKDIR'>W</link>
<!--               <link linkend='var-glossary-x'>X</link> -->
<!--               <link linkend='var-glossary-y'>Y</link> -->
<!--               <link linkend='var-glossary-z'>Z</link>-->
    </para>

    <glossdiv id='var-glossary-a'><title>A</title>

         <glossentry id='var-ALLOW_EMPTY'><glossterm>ALLOW_EMPTY</glossterm>
            <glossdef>
                <para>
                   Specifies if an output package should still be produced if it is empty.
                   By default, BitBake does not produce empty packages.
                   This default behavior can cause issues when there is an
                   <link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link> or
                   some other runtime hard-requirement on the existence of the package.
                </para>

                <para>
                   Like all package-controlling variables, you must always use them in
                   conjunction with a package name override.
                   Here is an example:
                   <literallayout class='monospaced'>
     ALLOW_EMPTY_${PN} = "1"
                   </literallayout>
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-ALTERNATIVE'><glossterm>ALTERNATIVE</glossterm>
            <glossdef>
                <para>
                    Lists commands in a package that need an alternative
                    binary naming scheme.
                    Sometimes the same command is provided in multiple packages.
                    When this occurs, the OpenEmbedded build system needs to
                    use the alternatives system to create a different binary
                    naming scheme so the commands can co-exist.
                </para>

                <para>
                    To use the variable, list out the package's commands
                    that also exist as part of another package.
                    For example, if the <filename>busybox</filename> package
                    has four commands that also exist as part of another
                    package, you identify them as follows:
                    <literallayout class='monospaced'>
     ALTERNATIVE_busybox = "sh sed test bracket"
                    </literallayout>
                    For more information on the alternatives system, see the
                    "<link linkend='ref-classes-update-alternatives'>Alternatives - <filename>update-alternatives.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-ALTERNATIVE_LINK_NAME'><glossterm>ALTERNATIVE_LINK_NAME</glossterm>
            <glossdef>
                <para>
                    Used by the alternatives system to map duplicated commands
                    to actual locations.
                    For example, if the <filename>bracket</filename> command
                    provided by the <filename>busybox</filename> package is
                    duplicated through another package, you must use the
                    <filename>ALTERNATIVE_LINK_NAME</filename> variable to
                    specify the actual location:
                    <literallayout class='monospaced'>
     ALTERNATIVE_LINK_NAME[bracket] = "/usr/bin/["
                    </literallayout>
                    In this example, the binary for the
                    <filename>bracket</filename> command (i.e.
                    <filename>[</filename>) from the
                    <filename>busybox</filename> package resides in
                    <filename>/usr/bin/</filename>.
                    <note>
                        If <filename>ALTERNATIVE_LINK_NAME</filename> is not
                        defined, it defaults to
                        <filename>${bindir}/&lt;name&gt;</filename>.
                    </note>
                </para>

                <para>
                    For more information on the alternatives system, see the
                    "<link linkend='ref-classes-update-alternatives'>Alternatives - <filename>update-alternatives.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-ALTERNATIVE_PRIORITY'><glossterm>ALTERNATIVE_PRIORITY</glossterm>
            <glossdef>
                <para>
                    Used by the alternatives system to create default
                    priorities for duplicated commands.
                    You can use the variable to create a single default
                    regardless of the command name or package, a default for
                    specific duplicated commands regardless of the package, or
                    a default for specific commands tied to particular packages.
                    Here are the available syntax forms:
                    <literallayout class='monospaced'>
     ALTERNATIVE_PRIORITY = "&lt;priority&gt;"
     ALTERNATIVE_PRIORITY[&lt;name&gt;] = "&lt;priority&gt;"
     ALTERNATIVE_PRIORITY_&lt;pkg&gt;[&lt;name&gt;] = "&lt;priority&gt;"
                    </literallayout>
                </para>

                <para>
                    For more information on the alternatives system, see the
                    "<link linkend='ref-classes-update-alternatives'>Alternatives - <filename>update-alternatives.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-ALTERNATIVE_TARGET'><glossterm>ALTERNATIVE_TARGET</glossterm>
            <glossdef>
                <para>
                    Used by the alternatives system to create default link
                    locations for duplicated commands.
                    You can use the variable to create a single default
                    location for all duplicated commands regardless of the
                    command name or package, a default for
                    specific duplicated commands regardless of the package, or
                    a default for specific commands tied to particular packages.
                    Here are the available syntax forms:
                    <literallayout class='monospaced'>
     ALTERNATIVE_TARGET = "&lt;target&gt;"
     ALTERNATIVE_TARGET[&lt;name&gt;] = "&lt;target&gt;"
     ALTERNATIVE_TARGET_&lt;pkg&gt;[&lt;name&gt;] = "&lt;target&gt;"
                    </literallayout>
                    <note>
                        <para>
                            If <filename>ALTERNATIVE_TARGET</filename> is not
                            defined, it inherits the value from the
                            <link linkend='var-ALTERNATIVE_LINK_NAME'><filename>ALTERNATIVE_LINK_NAME</filename></link>
                            variable.
                        </para>

                        <para>
                            If <filename>ALTERNATIVE_LINK_NAME</filename> and
                            <filename>ALTERNATIVE_TARGET</filename> are the
                            same, the target for
                            <filename>ALTERNATIVE_TARGET</filename>
                            has "<filename>.{BPN}</filename>" appended to it.
                        </para>

                        <para>
                            Finally, if the file referenced has not been
                            renamed, the alternatives system will rename it to
                            avoid the need to rename alternative files in the
                            <filename>do_install</filename> task while
                            retaining support for the command if necessary.
                        </para>
                    </note>
                </para>

                <para>
                    For more information on the alternatives system, see the
                    "<link linkend='ref-classes-update-alternatives'>Alternatives - <filename>update-alternatives.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-AUTHOR'><glossterm>AUTHOR</glossterm>
            <glossdef>
                <para>The email address used to contact the original author
                    or authors in order to send patches and forward bugs.</para>
            </glossdef>
         </glossentry>

        <glossentry id='var-AUTOREV'><glossterm>AUTOREV</glossterm>
            <glossdef>
                <para>When <filename><link linkend='var-SRCREV'>SRCREV</link></filename>
                    is set to the value of this variable, it specifies to use the latest
                    source revision in the repository.
                    Here is an example:
                    <literallayout class='monospaced'>
     SRCREV = "${AUTOREV}"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-b'><title>B</title>

        <glossentry id='var-B'><glossterm>B</glossterm>
            <glossdef>
                <para>
                    The directory within the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
                    in which the OpenEmbedded build system places generated
                    objects during a recipe's build process.
                    By default, this directory is the same as the <link linkend='var-S'><filename>S</filename></link>
                    directory:
                    <literallayout class='monospaced'>
     B = "${WORKDIR}/${BPN}/{PV}/"
                    </literallayout>
                    You can separate the (<filename>S</filename>) directory
                    and the directory pointed to by the <filename>B</filename>
                    variable.
                    Most Autotools-based recipes support separating these
                    directories.
                    The build system defaults to using separate directories for
                    <filename>gcc</filename> and some kernel recipes.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BAD_RECOMMENDATIONS'><glossterm>BAD_RECOMMENDATIONS</glossterm>
            <glossdef>
                <para>
                    A list of packages not to install despite being recommended by a recipe.
                    Support for this variable exists only when using the
                    IPK packaging backend.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BB_DANGLINGAPPENDS_WARNONLY'><glossterm>BB_DANGLINGAPPENDS_WARNONLY</glossterm>
            <glossdef>
                <para>
                    Defines how BitBake handles situations where an append
                    file (<filename>.bbappend</filename>) has no
                    corresponding recipe file (<filename>.bb</filename>).
                    This condition often occurs when layers get out of sync
                    (e.g. <filename>oe-core</filename> bumps a
                    recipe version and the old recipe no longer exists and the
                    other layer has not been updated to the new version
                    of the recipe yet).
                </para>

                <para>
                    The default fatal behavior is safest because it is
                    the sane reaction given something is out of sync.
                    It is important to realize when your changes are no longer
                    being applied.
                </para>

                <para>
                    You can change the default behavior by setting this
                    variable to "1" in the <filename>local.conf</filename>
                    file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
                    as follows:
                    <literallayout class='monospaced'>
     BB_DANGLINGAPPENDS_WARNONLY = "1"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BB_DISKMON_DIRS'><glossterm>BB_DISKMON_DIRS</glossterm>
            <glossdef>
                <para>
                    Monitors disk space and available inodes during the build
                    and allows you to control the build based on these
                    parameters.
                </para>

                <para>
                    Disk space monitoring is disabled by default.
                    To enable monitoring, add the <filename>BB_DISKMON_DIRS</filename>
                    variable to your <filename>conf/local.conf</filename> file found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    Use the following form:
                    <literallayout class='monospaced'>
     BB_DISKMON_DIRS = "&lt;action&gt;,&lt;dir&gt;,&lt;threshold&gt; [...]"

     where:

        &lt;action&gt; is:
           ABORT:     Immediately abort the build when
                      a threshold is broken.
           STOPTASKS: Stop the build after the currently
                      executing tasks have finished when
                      a threshold is broken.
           WARN:      Issue a warning but continue the
                      build when a threshold is broken.
                      Subsequent warnings are issued as
                      defined by the
                      <link linkend='var-BB_DISKMON_WARNINTERVAL'>BB_DISKMON_WARNINTERVAL</link> variable,
                      which must be defined in the
                      conf/local.conf file.

        &lt;dir&gt; is:
           Any directory you choose. You can specify one or
           more directories to monitor by separating the
           groupings with a space.  If two directories are
           on the same device, only the first directory
           is monitored.

        &lt;threshold&gt; is:
           Either the minimum available disk space,
           the minimum number of free inodes, or
           both.  You must specify at least one.  To
           omit one or the other, simply omit the value.
           Specify the threshold using G, M, K for Gbytes,
           Mbytes, and Kbytes, respectively. If you do
           not specify G, M, or K, Kbytes is assumed by
           default.  Do not use GB, MB, or KB.
                    </literallayout>
                </para>

                <para>
                    Here are some examples:
                    <literallayout class='monospaced'>
     BB_DISKMON_DIRS = "ABORT,${TMPDIR},1G,100K WARN,${SSTATE_DIR},1G,100K"
     BB_DISKMON_DIRS = "STOPTASKS,${TMPDIR},1G"
     BB_DISKMON_DIRS = "ABORT,${TMPDIR},,100K"
                    </literallayout>
                    The first example works only if you also provide
                    the <link linkend='var-BB_DISKMON_WARNINTERVAL'><filename>BB_DISKMON_WARNINTERVAL</filename></link> variable
                    in the <filename>conf/local.conf</filename>.
                    This example causes the build system to immediately
                    abort when either the disk space in <filename>${TMPDIR}</filename> drops
                    below 1 Gbyte or the available free inodes drops below
                    100 Kbytes.
                    Because two directories are provided with the variable, the
                    build system also issue a
                    warning when the disk space in the
                    <filename>${SSTATE_DIR}</filename> directory drops
                    below 1 Gbyte or the number of free inodes drops
                    below 100 Kbytes.
                    Subsequent warnings are issued during intervals as
                    defined by the <filename>BB_DISKMON_WARNINTERVAL</filename>
                    variable.
                </para>

                <para>
                    The second example stops the build after all currently
                    executing tasks complete when the minimum disk space
                    in the <filename>${<link linkend='var-TMPDIR'>TMPDIR</link>}</filename>
                    directory drops below 1 Gbyte.
                    No disk monitoring occurs for the free inodes in this case.
                </para>

                <para>
                    The final example immediately aborts the build when the
                    number of free inodes in the <filename>${TMPDIR}</filename> directory
                    drops below 100 Kbytes.
                    No disk space monitoring for the directory itself occurs
                    in this case.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BB_DISKMON_WARNINTERVAL'><glossterm>BB_DISKMON_WARNINTERVAL</glossterm>
            <glossdef>
                <para>
                    Defines the disk space and free inode warning intervals.
                    To set these intervals, define the variable in your
                    <filename>conf/local.conf</filename> file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                </para>

                <para>
                    If you are going to use the
                    <filename>BB_DISKMON_WARNINTERVAL</filename> variable, you must
                    also use the
                    <link linkend='var-BB_DISKMON_DIRS'><filename>BB_DISKMON_DIRS</filename></link> variable
                    and define its action as "WARN".
                    During the build, subsequent warnings are issued each time
                    disk space or number of free inodes further reduces by
                    the respective interval.
                </para>

                <para>
                    If you do not provide a <filename>BB_DISKMON_WARNINTERVAL</filename>
                    variable and you do use <filename>BB_DISKMON_DIRS</filename> with
                    the "WARN" action, the disk monitoring interval defaults to
                    the following:
                    <literallayout class='monospaced'>
     BB_DISKMON_WARNINTERVAL = "50M,5K"
                    </literallayout>
                </para>

                <para>
                    When specifying the variable in your configuration file,
                    use the following form:
                    <literallayout class='monospaced'>
     BB_DISKMON_WARNINTERVAL = "&lt;disk_space_interval&gt;,&lt;disk_inode_interval&gt;"

     where:

        &lt;disk_space_interval&gt; is:
           An interval of memory expressed in either
           G, M, or K for Gbytes, Mbytes, or Kbytes,
           respectively. You cannot use GB, MB, or KB.

        &lt;disk_inode_interval&gt; is:
           An interval of free inodes expressed in either
           G, M, or K for Gbytes, Mbytes, or Kbytes,
           respectively. You cannot use GB, MB, or KB.
                    </literallayout>
                </para>

                <para>
                    Here is an example:
                    <literallayout class='monospaced'>
     BB_DISKMON_DIRS = "WARN,${SSTATE_DIR},1G,100K"
     BB_DISKMON_WARNINTERVAL = "50M,5K"
                    </literallayout>
                    These variables cause the OpenEmbedded build system to
                    issue subsequent warnings each time the available
                    disk space further reduces by 50 Mbytes or the number
                    of free inodes further reduces by 5 Kbytes in the
                    <filename>${SSTATE_DIR}</filename> directory.
                    Subsequent warnings based on the interval occur each time
                    a respective interval is reached beyond the initial warning
                    (i.e. 1 Gbytes and 100 Kbytes).
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBCLASSEXTEND'><glossterm>BBCLASSEXTEND</glossterm>
            <glossdef>
                <para>
                    Allows you to extend a recipe so that it builds variants of the software.
                    Common variants for recipes exist such as "natives" like <filename>quilt-native</filename>,
                    which is a copy of Quilt built to run on the build system;
                    "crosses" such as <filename>gcc-cross</filename>,
                    which is a compiler built to run on the build machine but produces binaries
                    that run on the target <link linkend='var-MACHINE'><filename>MACHINE</filename></link>;
                    "nativesdk", which targets the SDK machine instead of <filename>MACHINE</filename>;
                    and "mulitlibs" in the form "<filename>multilib:&lt;multilib_name&gt;</filename>".
                </para>

                <para>
                    To build a different variant of the recipe with a minimal amount of code, it usually
                    is as simple as adding the following to your recipe:
                    <literallayout class='monospaced'>
     BBCLASSEXTEND =+ "native nativesdk"
     BBCLASSEXTEND =+ "multilib:&lt;multilib_name&gt;"
                    </literallayout>
                </para>
             </glossdef>
        </glossentry>

        <glossentry id='var-BBMASK'><glossterm>BBMASK</glossterm>
            <glossdef>
                <para>
                    Prevents BitBake from processing recipes and recipe
                    append files.
                    Use the <filename>BBMASK</filename> variable from within the
                    <filename>conf/local.conf</filename> file found
                    in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                </para>

                <para>
                    You can use the <filename>BBMASK</filename> variable
                    to "hide" these <filename>.bb</filename> and
                    <filename>.bbappend</filename> files.
                    BitBake ignores any recipe or recipe append files that
                    match the expression.
                    It is as if BitBake does not see them at all.
                    Consequently, matching files are not parsed or otherwise
                    used by BitBake.</para>
                <para>
                    The value you provide is passed to Python's regular
                    expression compiler.
                    The expression is compared against the full paths to
                    the files.
                    For complete syntax information, see Python's
                    documentation at
                    <ulink url='http://docs.python.org/release/2.3/lib/re-syntax.html'></ulink>.
                </para>

                <para>
                    The following example uses a complete regular expression
                    to tell BitBake to ignore all recipe and recipe append
                    files in the <filename>/meta-ti/recipes-misc/</filename>
                    directory:
                    <literallayout class='monospaced'>
     BBMASK = "/meta-ti/recipes-misc/"
                    </literallayout>
                    If you want to mask out multiple directories or recipes,
                    use the vertical bar to separate the regular expression
                    fragments.
                    This next example masks out multiple directories and
                    individual recipes:
                    <literallayout class='monospaced'>
     BBMASK = "meta-ti/recipes-misc/|meta-ti/recipes-ti/packagegroup/"
     BBMASK .= "|.*meta-oe/recipes-support/"
     BBMASK .= "|.*openldap"
     BBMASK .= "|.*opencv"
     BBMASK .= "|.*lzma"
                    </literallayout>
                    Notice how the vertical bar is used to append the fragments.
                    <note>
                        When specifying a directory name, use the trailing
                        slash character to ensure you match just that directory
                        name.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BB_NUMBER_THREADS'><glossterm>BB_NUMBER_THREADS</glossterm>
            <glossdef>
                <para>The maximum number of tasks BitBake should run in parallel at any one time.
                    If your host development system supports multiple cores a good rule of thumb
                    is to set this variable to twice the number of cores.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBFILE_COLLECTIONS'><glossterm>BBFILE_COLLECTIONS</glossterm>
            <glossdef>
                <para>Lists the names of configured layers.
                    These names are used to find the other <filename>BBFILE_*</filename>
                    variables.
                    Typically, each layer will append its name to this variable in its
                    <filename>conf/layer.conf</filename> file.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBFILE_PATTERN'><glossterm>BBFILE_PATTERN</glossterm>
            <glossdef>
                <para>Variable that expands to match files from
                    <link linkend='var-BBFILES'><filename>BBFILES</filename></link>
                    in a particular layer.
                    This variable is used in the <filename>conf/layer.conf</filename> file and must
                    be suffixed with the name of the specific layer (e.g.
                    <filename>BBFILE_PATTERN_emenlow</filename>).</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBFILE_PRIORITY'><glossterm>BBFILE_PRIORITY</glossterm>
            <glossdef>
                <para>Assigns the priority for recipe files in each layer.</para>
                <para>This variable is useful in situations where the same recipe appears in
                    more than one layer.
                    Setting this variable allows you to prioritize a
                    layer against other layers that contain the same recipe - effectively
                    letting you control the precedence for the multiple layers.
                    The precedence established through this variable stands regardless of a
                    recipe's version
                    (<link linkend='var-PV'><filename>PV</filename></link> variable).
                    For example, a layer that has a recipe with a higher <filename>PV</filename> value but for
                    which the <filename>BBFILE_PRIORITY</filename> is set to have a lower precedence still has a
                    lower precedence.</para>
                <para>A larger value for the <filename>BBFILE_PRIORITY</filename> variable results in a higher
                    precedence.
                    For example, the value 6 has a higher precedence than the value 5.
                    If not specified, the <filename>BBFILE_PRIORITY</filename> variable is set based on layer
                    dependencies (see the
                    <filename><link linkend='var-LAYERDEPENDS'>LAYERDEPENDS</link></filename> variable for
                    more information.
                    The default priority, if unspecified
                    for a layer with no dependencies, is the lowest defined priority + 1
                    (or 1 if no priorities are defined).</para>
                <tip>
                    You can use the command <filename>bitbake-layers show_layers</filename> to list
                    all configured layers along with their priorities.
                </tip>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBFILES'><glossterm>BBFILES</glossterm>
            <glossdef>
                <para>List of recipe files used by BitBake to build software.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBPATH'><glossterm>BBPATH</glossterm>
            <glossdef>
                <para>Used by BitBake to locate <filename>.bbclass</filename> and configuration files.
                    This variable is analogous to the <filename>PATH</filename> variable.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBINCLUDELOGS'><glossterm>BBINCLUDELOGS</glossterm>
            <glossdef>
                <para>Variable that controls how BitBake displays logs on build failure.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBLAYERS'><glossterm>BBLAYERS</glossterm>
            <glossdef>
                <para>Lists the layers to enable during the build.
                    This variable is defined in the <filename>bblayers.conf</filename> configuration
                    file in the <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    Here is an example:
                    <literallayout class='monospaced'>
     BBLAYERS = " \
       /home/scottrif/poky/meta \
       /home/scottrif/poky/meta-yocto \
       /home/scottrif/poky/meta-yocto-bsp \
       /home/scottrif/poky/meta-mykernel \
       "

     BBLAYERS_NON_REMOVABLE ?= " \
       /home/scottrif/poky/meta \
       /home/scottrif/poky/meta-yocto \
       "
                    </literallayout>
                    This example enables four layers, one of which is a custom, user-defined layer
                    named <filename>meta-mykernel</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BBLAYERS_NON_REMOVABLE'><glossterm>BBLAYERS_NON_REMOVABLE</glossterm>
            <glossdef>
Core layer for images cannot be removed
                <para>Lists core layers that cannot be removed from the
                    <filename>bblayers.conf</filename> file.
                    In order for BitBake to build your image, your
                    <filename>bblayers.conf</filename> file must include the
                    <filename>meta</filename> and <filename>meta-yocto</filename>
                    core layers.
                    Here is an example that shows these two layers listed in
                    the <filename>BBLAYERS_NON_REMOVABLE</filename> statement:
                    <literallayout class='monospaced'>
     BBLAYERS = " \
       /home/scottrif/poky/meta \
       /home/scottrif/poky/meta-yocto \
       /home/scottrif/poky/meta-yocto-bsp \
       /home/scottrif/poky/meta-mykernel \
       "

     BBLAYERS_NON_REMOVABLE ?= " \
       /home/scottrif/poky/meta \
       /home/scottrif/poky/meta-yocto \
       "
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BINCONFIG_GLOB'><glossterm>BINCONFIG_GLOB</glossterm>
            <glossdef>
                <para>
                    When inheriting <filename>binconfig.bbclass</filename>
                    from a recipe, this variable specifies a wildcard for
                    configuration scripts that need editing.
                    The scripts are edited to correct any paths that have been
                    set up during compilation so that they are correct for
                    use when installed into the sysroot and called by the
                    build processes of other recipes.
                </para>

                <para>
                    For more information on how this variable works, see
                    <filename>meta/classes/binconfig.bbclass</filename> in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                    You can also find general information on the class in the
                    "<link linkend='ref-classes-binconfig'><filename>binconfig.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BP'><glossterm>BP</glossterm>
            <glossdef>
                <para>The base recipe name and version but without any special
                    recipe name suffix (i.e. <filename>-native</filename>, <filename>lib64-</filename>,
                    and so forth).
                    <filename>BP</filename> is comprised of the following:
                    <literallayout class="monospaced">
     ${BPN}-${PV}
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BPN'><glossterm>BPN</glossterm>
            <glossdef>
                <para>The bare name of the recipe.
                    This variable is a version of the <link linkend='var-PN'><filename>PN</filename></link> variable
                    but removes common suffixes such as "-native" and "-cross" as well
                    as removes common prefixes such as multilib's "lib64-" and "lib32-".
                    The exact list of suffixes removed is specified by the
                    <link linkend='var-SPECIAL_PKGSUFFIX'><filename>SPECIAL_PKGSUFFIX</filename></link> variable.
                    The exact list of prefixes removed is specified by the
                    <link linkend='var-MLPREFIX'><filename>MLPREFIX</filename></link> variable.
                    Prefixes are removed for <filename>multilib</filename>
                    and <filename>nativesdk</filename> cases.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-BUILDDIR'><glossterm>BUILDDIR</glossterm>
            <glossdef>
                <para>Points to the location of the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    You can define this directory indirectly through the
                    <link linkend='structure-core-script'><filename>&OE_INIT_FILE;</filename></link>
                    script by passing in a Build Directory path when you run the
                    script.
                    If you run the script and do not provide a Build Directory
                    path, the <filename>BUILDDIR</filename> defaults to
                    <filename>build</filename> in the current directory.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-c'><title>C</title>

        <glossentry id='var-CFLAGS'><glossterm>CFLAGS</glossterm>
            <glossdef>
                <para>
                    Flags passed to the C compiler for the target system.
                    This variable evaluates to the same as
                    <filename><link linkend='var-TARGET_CFLAGS'>TARGET_CFLAGS</link></filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-COMBINED_FEATURES'><glossterm>COMBINED_FEATURES</glossterm>
            <glossdef>
                <para>A set of features common between
                    <link linkend='var-MACHINE_FEATURES'><filename>MACHINE_FEATURES</filename></link>
                    and <link linkend='var-DISTRO_FEATURES'><filename>DISTRO_FEATURES</filename></link>.
                    See the glossary descriptions for these variables for more information.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-COMMON_LICENSE_DIR'><glossterm>COMMON_LICENSE_DIR</glossterm>
            <glossdef>
                <para>
                    Points to <filename>meta/files/common-licenses</filename>
                    in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>,
                    which is where generic license files reside.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-COMPATIBLE_HOST'><glossterm>COMPATIBLE_HOST</glossterm>
            <glossdef>
                <para>A regular expression that resolves to one or more hosts
                    (when the recipe is native) or one or more targets (when
                    the recipe is non-native) with which a recipe is compatible.
                    The regular expression is matched against
                    <link linkend="var-HOST_SYS"><filename>HOST_SYS</filename></link>.
                    You can use the variable to stop recipes from being built
                    for classes of systems with which the recipes are not
                    compatible.
                    Stopping these builds is particularly useful with kernels.
                    The variable also helps to increase parsing speed
                    since the build system skips parsing recipes not
                    compatible with the current system.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-COMPATIBLE_MACHINE'><glossterm>COMPATIBLE_MACHINE</glossterm>
            <glossdef>
                <para>A regular expression that resolves to one or more
                    target machines with which a recipe is compatible.
                    The regular expression is matched against
                    <link linkend="var-MACHINEOVERRIDES"><filename>MACHINEOVERRIDES</filename></link>.
                    You can use the variable to stop recipes from being built
                    for machines with which the recipes are not compatible.
                    Stopping these builds is particularly useful with kernels.
                    The variable also helps to increase parsing speed
                    since the build system skips parsing recipes not
                    compatible with the current machine.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-CONFFILES'><glossterm>CONFFILES</glossterm>
            <glossdef>
                <para>
                    Identifies editable or configurable files that are part of a package.
                    If the Package Management System (PMS) is being used to update
                    packages on the target system, it is possible that
                    configuration files you have changed after the original installation
                    and that you now want to remain unchanged are overwritten.
                    In other words, editable files might exist in the package that you do not
                    want reset as part of the package update process.
                    You can use the <filename>CONFFILES</filename> variable to list the files in the
                    package that you wish to prevent the PMS from overwriting during this update process.
                </para>

                <para>
                    To use the <filename>CONFFILES</filename> variable, provide a package name
                    override that identifies the resulting package.
                    Then, provide a space-separated list of files.
                    Here is an example:
                    <literallayout class='monospaced'>
  CONFFILES_${PN} += "${sysconfdir}/file1 \
     ${sysconfdir}/file2 ${sysconfdir}/file3"
                    </literallayout>
                </para>

                <para>
                    A relationship exists between the <filename>CONFFILES</filename> and
                    <filename><link linkend='var-FILES'>FILES</link></filename> variables.
                    The files listed within <filename>CONFFILES</filename> must be a subset of
                    the files listed within <filename>FILES</filename>.
                    Because the configuration files you provide with <filename>CONFFILES</filename>
                    are simply being identified so that the PMS will not overwrite them,
                    it makes sense that
                    the files must already be included as part of the package through the
                    <filename>FILES</filename> variable.
                </para>

                <note>
                    When specifying paths as part of the <filename>CONFFILES</filename> variable,
                    it is good practice to use appropriate path variables.
                    For example, <filename>${sysconfdir}</filename> rather than
                    <filename>/etc</filename> or <filename>${bindir}</filename> rather
                    than <filename>/usr/bin</filename>.
                    You can find a list of these variables at the top of the
                    <filename>/meta/conf/bitbake.conf</filename> file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                </note>
            </glossdef>
        </glossentry>

        <glossentry id='var-CONFIG_SITE'><glossterm>CONFIG_SITE</glossterm>
            <glossdef>
                <para>
                    A list of files that contains <filename>autoconf</filename> test results relevant
                    to the current build.
                    This variable is used by the Autotools utilities when running
                    <filename>configure</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-CORE_IMAGE_EXTRA_INSTALL'><glossterm>CORE_IMAGE_EXTRA_INSTALL</glossterm>
            <glossdef>
                <para>
                    Specifies the list of packages to be added to the image.
                    You should only set this variable in the
                    <filename>local.conf</filename> configuration file found
                    in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                </para>

                <para>
                    This variable replaces <filename>POKY_EXTRA_INSTALL</filename>, which is no longer supported.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-COREBASE'><glossterm>COREBASE</glossterm>
            <glossdef>
                <para>
                    Specifies the parent directory of the OpenEmbedded
                    Core Metadata layer (i.e. <filename>/meta</filename>).
                </para>

                <para>
                    It is an important distinction that
                    <filename>COREBASE</filename> points to the parent of this
                    layer and not the layer itself.
                    Consider an example where you have cloned the Poky Git
                    repository and retained the <filename>poky</filename>
                    name for your local copy of the repository.
                    In this case, <filename>COREBASE</filename> points to
                    the <filename>poky</filename> folder because it is the
                    parent directory of the <filename>poky/meta</filename>
                    layer.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-d'><title>D</title>

        <glossentry id='var-D'><glossterm>D</glossterm>
            <glossdef>
                <para>The destination directory.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DEBUG_BUILD'><glossterm>DEBUG_BUILD</glossterm>
            <glossdef>
                <para>
                    Specifies to build packages with debugging information.
                    This influences the value of the
                    <filename><link linkend='var-SELECTED_OPTIMIZATION'>SELECTED_OPTIMIZATION</link></filename>
                    variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DEBUG_OPTIMIZATION'><glossterm>DEBUG_OPTIMIZATION</glossterm>
            <glossdef>
                <para>
                    The options to pass in
                    <filename><link linkend='var-TARGET_CFLAGS'>TARGET_CFLAGS</link></filename>
                    and <filename><link linkend='var-CFLAGS'>CFLAGS</link></filename> when compiling
                    a system for debugging.
                    This variable defaults to "-O -fno-omit-frame-pointer -g".
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DEFAULT_PREFERENCE'><glossterm>DEFAULT_PREFERENCE</glossterm>
            <glossdef>
                <para>
                    Specifies a weak bias for recipe selection priority.
                </para>
                <para>
                    The most common usage of this is variable is to set
                    it to "-1" within a recipe for a development version of a
                    piece of software.
                    Using the variable in this way causes the stable version
                    of the recipe to build by default in the absence of
                    <filename><link linkend='var-PREFERRED_VERSION'>PREFERRED_VERSION</link></filename>
                    being used to build the development version.
                </para>
                <note>
                    The bias provided by <filename>DEFAULT_PREFERENCE</filename>
                    is weak and is overridden by
                    <filename><link linkend='var-BBFILE_PRIORITY'>BBFILE_PRIORITY</link></filename>
                    if the that variable is different between two layers
                    that contain different versions of the same recipe.
                </note>
            </glossdef>
        </glossentry>

        <glossentry id='var-DEPENDS'><glossterm>DEPENDS</glossterm>
            <glossdef>
                <para>
                    Lists a recipe's build-time dependencies
                    (i.e. other recipe files).
                    The system ensures that all the dependencies listed
                    have been built and have their contents in the appropriate
                    sysroots before the recipe's configure task is executed.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DEPLOY_DIR'><glossterm>DEPLOY_DIR</glossterm>
            <glossdef>
                <para>
                    Points to the area that the OpenEmbedded build system uses
                    to place images, packages, SDKs and other output
                    files that are ready to be used outside of the build system.
                    By default, this directory resides within the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
                    as <filename>tmp/deploy</filename>.
                </para>

                <para>
                    For more information on the structure of the Build
                    Directory, see
                    "<link linkend='structure-build'>The Build Directory - <filename>build/</filename></link>"
                    section.
                    For more detail on the contents of the
                    <filename>deploy</filename> directory, see the
                    "<link linkend='images-dev-environment'>Images</link>" and
                    "<link linkend='sdk-dev-environment'>Application Development SDK</link>"
                    sections.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DESCRIPTION'><glossterm>DESCRIPTION</glossterm>
            <glossdef>
                <para>The package description used by package managers.
                      If not set, <filename>DESCRIPTION</filename> takes
                      the value of the
                      <link linkend='var-SUMMARY'><filename>SUMMARY</filename></link>
                      variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DESTDIR'><glossterm>DESTDIR</glossterm>
            <glossdef>
                <para>the destination directory.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO'><glossterm>DISTRO</glossterm>
            <glossdef>
                <para>
                    The short name of the distribution.
                    This variable corresponds to a file with the
                    extension <filename>.conf</filename>
                    located in a <filename>conf/distro</filename> directory
                    within the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>
                    that contains the distribution configuration.
                    The value must not contain spaces, and is typically all lower-case.
                </para>
                <para>
                    If the variable is blank, a set of default configuration
                    will be used, which is specified
                    within <filename>meta/conf/distro/defaultsetup.conf</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_EXTRA_RDEPENDS'><glossterm>DISTRO_EXTRA_RDEPENDS</glossterm>
            <glossdef>
                <para>
                    Specifies a list of distro-specific packages to add to all images.
                    This variable takes affect through
                    <filename>packagegroup-base</filename> so the
                    variable only really applies to the more full-featured
                    images that include <filename>packagegroup-base</filename>.
                    You can use this variable to keep distro policy out of
                    generic images.
                    As with all other distro variables, you set this variable
                    in the distro <filename>.conf</filename> file.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_EXTRA_RRECOMMENDS'><glossterm>DISTRO_EXTRA_RRECOMMENDS</glossterm>
            <glossdef>
                <para>
                    Specifies a list of distro-specific packages to add to all images
                    if the packages exist.
                    The packages might not exist or be empty (e.g. kernel modules).
                    The list of packages are automatically installed but you can
                    remove them.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_FEATURES'><glossterm>DISTRO_FEATURES</glossterm>
            <glossdef>
                <para>The features enabled for the distribution.
                    For a list of supported features that ship with the
                    Yocto Project, see the
                    "<link linkend='ref-features-distro'>Distro</link>"
                    section.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_FEATURES_BACKFILL'><glossterm>DISTRO_FEATURES_BACKFILL</glossterm>
            <glossdef>
                <para>Features to be added to
                    <filename><link linkend='var-DISTRO_FEATURES'>DISTRO_FEATURES</link></filename>
                    if not also present in
                    <filename><link linkend='var-DISTRO_FEATURES_BACKFILL_CONSIDERED'>DISTRO_FEATURES_BACKFILL_CONSIDERED</link></filename>.
                </para>

                <para>
                    This variable is set in the <filename>meta/conf/bitbake.conf</filename> file.
                    It is not intended to be user-configurable.
                    It is best to just reference the variable to see which distro features are
                    being backfilled for all distro configurations.
                    See the <link linkend='ref-features-backfill'>Feature backfilling</link> section for
                    more information.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_FEATURES_BACKFILL_CONSIDERED'><glossterm>DISTRO_FEATURES_BACKFILL_CONSIDERED</glossterm>
            <glossdef>
                <para>Features from
                    <filename><link linkend='var-DISTRO_FEATURES_BACKFILL'>DISTRO_FEATURES_BACKFILL</link></filename>
                    that should not be backfilled (i.e. added to
                    <filename><link linkend='var-DISTRO_FEATURES'>DISTRO_FEATURES</link></filename>)
                    during the build.
                    See the "<link linkend='ref-features-backfill'>Feature Backfilling</link>" section for
                    more information.
                    </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_NAME'><glossterm>DISTRO_NAME</glossterm>
            <glossdef>
                <para>The long name of the distribution.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_PN_ALIAS'><glossterm>DISTRO_PN_ALIAS</glossterm>
            <glossdef>
                <para>Alias names used for the recipe in various Linux distributions.</para>
                <para>See the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#usingpoky-configuring-DISTRO_PN_ALIAS'>Handling
                    a Package Name Alias</ulink>" section in the Yocto Project Development
                    Manual for more information.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTRO_VERSION'><glossterm>DISTRO_VERSION</glossterm>
            <glossdef>
                <para>the version of the distribution.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DISTROOVERRIDES'><glossterm>DISTROOVERRIDES</glossterm>
            <glossdef>
                <para>
                    This variable lists overrides specific to the current
                    distribution.
                    By default, the variable list includes the value of the
                    <filename><link linkend='var-DISTRO'>DISTRO</link></filename>
                    variable.
                    You can extend the variable to apply any variable overrides
                    you want as part of the distribution and are not
                    already in <filename>OVERRIDES</filename> through
                    some other means.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-DL_DIR'><glossterm>DL_DIR</glossterm>
            <glossdef>
                <para>
                    The central download directory used by the build process to store downloads.
                    You can set this directory by defining the <filename>DL_DIR</filename>
                    variable in the <filename>/conf/local.conf</filename> file.
                    This directory is self-maintaining and you should not have
                    to touch it.
                    By default, the directory is <filename>downloads</filename> in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    <literallayout class='monospaced'>
     #DL_DIR ?= "${TOPDIR}/downloads"
                    </literallayout>
                    To specify a different download directory, simply uncomment the line
                    and provide your directory.
                </para>

                <para>
                    During a first build, the system downloads many different source code
                    tarballs from various upstream projects.
                    Downloading can take a while, particularly if your network
                    connection is slow.
                    Tarballs are all stored in the directory defined by
                    <filename>DL_DIR</filename> and the build system looks there first
                    to find source tarballs.
                    <note>
                        When wiping and rebuilding, you can preserve this directory to speed
                        up this part of subsequent builds.
                    </note>
                </para>

                <para>
                    You can safely share this directory between multiple builds on the
                    same development machine.
                    For additional information on how the build process gets
                    source files when working behind a firewall or proxy server,
                    see this specific question in the
                    "<link linkend='how-does-the-yocto-project-obtain-source-code-and-will-it-work-behind-my-firewall-or-proxy-server'>FAQ</link>"
                    chapter.
                </para>
            </glossdef>

        </glossentry>
    </glossdiv>

    <glossdiv id='var-glossary-e'><title>E</title>

        <glossentry id='var-ENABLE_BINARY_LOCALE_GENERATION'><glossterm>ENABLE_BINARY_LOCALE_GENERATION</glossterm>
            <glossdef>
                <para></para>
                <para>Variable that controls which locales for
                    <filename>eglibc</filename> are generated during the
                    build (useful if the target device has 64Mbytes
                    of RAM or less).</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXCLUDE_FROM_WORLD'><glossterm>EXCLUDE_FROM_WORLD</glossterm>
            <glossdef>
                <para>
                    Directs BitBake to exclude a recipe from world builds (i.e.
                    <filename>bitbake world</filename>).
                    This variable is intrinsically understood by BitBake.
                </para>

                <note>
                    During world builds, BitBake locates, parses and builds all
                    recipes found in every layer exposed in the
                    <filename>bblayers.conf</filename> configuration file.
                </note>

                <para>
                    To exclude a recipe from a world build using this variable,
                    set the variable to "1" in the recipe.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTENDPKGV'><glossterm>EXTENDPKGV</glossterm>
            <glossdef>
                <para>
                    The full package version specification as it appears on the
                    final packages produced by a recipe.
                    The variable's value is normally used to fix a runtime
                    dependency to the exact same version of another package
                    in the same recipe:
                    <literallayout class='monospaced'>
     RDEPENDS_${PN}-additional-module = "${PN} (= ${EXTENDPKGV})"
                    </literallayout>
                </para>

                <para>
                    The dependency relationships are intended to force the
                    package manager to upgrade these types of packages in
                    lock-step.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTENDPE'><glossterm>EXTENDPE</glossterm>
            <glossdef>
                <para>
                    Used with file and pathnames to create a prefix for a recipe's
                    version based on the recipe's
                    <link linkend='var-PE'><filename>PE</filename></link> value.
                    If <filename>PE</filename> is set and greater than zero for a recipe,
                    <filename>EXTENDPE</filename> becomes that value (e.g if
                    <filename>PE</filename> is equal to "1" then <filename>EXTENDPE</filename>
                    becomes "1_").
                    If a recipe's <filename>PE</filename> is not set (the default) or is equal to
                    zero, <filename>EXTENDPE</filename> becomes "".</para>
                    <para>See the <link linkend='var-STAMP'><filename>STAMP</filename></link>
                    variable for an example.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTERNALSRC'><glossterm>EXTERNALSRC</glossterm>
            <glossdef>
                <para>
                    If <filename>externalsrc.bbclass</filename> is inherited,
                    this variable points to the source tree, which is
                    outside of the OpenEmbedded build system.
                    When set, this variable sets the
                    <link linkend='var-S'><filename>S</filename></link>
                    variable, which is what the OpenEmbedded build system uses
                    to locate unpacked recipe source code.
                </para>

                <para>
                    For more information on
                    <filename>externalsrc.bbclass</filename>, see the
                    "<link linkend='ref-classes-externalsrc'><filename>externalsrc.bbclass</filename></link>"
                    section.
                    You can also find information on how to use this variable
                    in the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#building-software-from-an-external-source'>Building Software from an External Source</ulink>"
                    section in the Yocto Project Development Manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTERNALSRC_BUILD'><glossterm>EXTERNALSRC_BUILD</glossterm>
            <glossdef>
                <para>
                    If <filename>externalsrc.bbclass</filename> is inherited,
                    this variable points to the directory in which the recipe's
                    source code is built,
                    which is outside of the OpenEmbedded build system.
                    When set, this variable sets the
                    <link linkend='var-B'><filename>B</filename></link>
                    variable, which is what the OpenEmbedded build system uses
                    to locate the Build Directory.
                </para>

                <para>
                    For more information on
                    <filename>externalsrc.bbclass</filename>, see the
                    "<link linkend='ref-classes-externalsrc'><filename>externalsrc.bbclass</filename></link>"
                    section.
                    You can also find information on how to use this variable
                    in the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#building-software-from-an-external-source'>Building Software from an External Source</ulink>"
                    section in the Yocto Project Development Manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTRA_IMAGE_FEATURES'><glossterm>EXTRA_IMAGE_FEATURES</glossterm>
            <glossdef>
                <para>
                    The list of additional features to include in an image.
                    Typically, you configure this variable in your
                    <filename>local.conf</filename> file, which is found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    Although you can use this variable from within a recipe,
                    best practices dictate that you do not.
                    <note>
                        To enable primary features from within the image
                        recipe, use the
                        <link linkend='var-IMAGE_FEATURES'><filename>IMAGE_FEATURES</filename></link>
                        variable.
                    </note>
                </para>

                <para>
                    Here are some examples of features you can add:
                    <literallayout class='monospaced'>
"dbg-pkgs" - Adds -dbg packages for all installed packages
             including symbol information for debugging and
             profiling.

"debug-tweaks" - Makes an image suitable for development.
                 For example, ssh root access has a blank
                 password.  You should remove this feature
                 before you produce a production image.

"dev-pkgs" - Adds -dev packages for all installed packages.
             This is useful if you want to develop against
             the libraries in the image.

"read-only-rootfs" - Creates an image whose root
                     filesystem is read-only. See the
                     "<ulink url='&YOCTO_DOCS_DEV_URL;#creating-a-read-only-root-filesystem'>Creating a Read-Only Root Filesystem</ulink>"
                     section in the Yocto Project
                     Development Manual for more
                     information

"tools-debug" - Adds debugging tools such as gdb and
                strace.

"tools-profile" - Adds profiling tools such as oprofile,
                  exmap, lttng and valgrind (x86 only).

"tools-sdk" - Adds development tools such as gcc, make,
              pkgconfig and so forth.

"tools-testapps" - Adds useful testing tools such as
                   ts_print, aplay, arecord and so
                   forth.

                    </literallayout>
                </para>

                <para>
                    For a complete list of image features that ships with the
                    Yocto Project, see the
                    "<link linkend="ref-features-image">Images</link>"
                    section.
                </para>

                <para>
                    For an example that shows how to customize your image by
                    using this variable, see the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#usingpoky-extend-customimage-imagefeatures'>Customizing Images Using Custom <filename>IMAGE_FEATURES</filename> and <filename>EXTRA_IMAGE_FEATURES</filename></ulink>"
                    section in the Yocto Project Development Manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTRA_IMAGEDEPENDS'><glossterm>EXTRA_IMAGEDEPENDS</glossterm>
            <glossdef>
                <para>A list of recipes to build that do not provide packages
                    for installing into the root filesystem.
                </para>
                <para>Sometimes a recipe is required to build the final image but is not
                    needed in the root filesystem.
                    You can use the <filename>EXTRA_IMAGEDEPENDS</filename> variable to
                    list these recipes and thus, specify the dependencies.
                    A typical example is a required bootloader in a machine configuration.
                </para>
                <note>
                    To add packages to the root filesystem, see the various
                    <filename>*<link linkend='var-RDEPENDS'>RDEPENDS</link></filename>
                    and <filename>*<link linkend='var-RRECOMMENDS'>RRECOMMENDS</link></filename>
                    variables.
                </note>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTRA_OECMAKE'><glossterm>EXTRA_OECMAKE</glossterm>
            <glossdef>
                <para>Additional <filename>cmake</filename> options.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTRA_OECONF'><glossterm>EXTRA_OECONF</glossterm>
            <glossdef>
                <para>Additional <filename>configure</filename> script options.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-EXTRA_OEMAKE'><glossterm>EXTRA_OEMAKE</glossterm>
            <glossdef>
                <para>Additional GNU <filename>make</filename> options.</para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-f'><title>F</title>

        <glossentry id='var-FILES'><glossterm>FILES</glossterm>
            <glossdef>
                <para>
                    The list of directories or files that are placed in packages.
                </para>

                <para>
                    To use the <filename>FILES</filename> variable, provide a package name
                    override that identifies the resulting package.
                    Then, provide a space-separated list of files or paths that identifies the
                    files you want included as part of the resulting package.
                    Here is an example:
                    <literallayout class='monospaced'>
  FILES_${PN} += "${bindir}/mydir1/ ${bindir}/mydir2/myfile"
                    </literallayout>
                </para>

                <note>
                    When specifying paths as part of the <filename>FILES</filename> variable,
                    it is good practice to use appropriate path variables.
                    For example, <filename>${sysconfdir}</filename> rather than
                    <filename>/etc</filename> or <filename>${bindir}</filename> rather
                    than <filename>/usr/bin</filename>.
                    You can find a list of these variables at the top of the
                    <filename>/meta/conf/bitbake.conf</filename> file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                </note>

                <para>
                    If some of the files you provide with the <filename>FILES</filename> variable
                    are editable and you know they should not be
                    overwritten during the package update process by the Package Management
                    System (PMS), you can identify these files so that the PMS will not
                    overwrite them.
                    See the <filename><link linkend='var-CONFFILES'>CONFFILES</link></filename>
                    variable for information on how to identify these files to the PMS.
                </para>

            </glossdef>
        </glossentry>

        <glossentry id='var-FILESEXTRAPATHS'><glossterm>FILESEXTRAPATHS</glossterm>
            <glossdef>
                <para>
                    Extends the search path the OpenEmbedded build system uses
                    when looking for files and patches as it processes recipes
                    and append files.
                    The default directories BitBake uses when it processes
                    recipes are initially defined by the
                    <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link>
                    variable.
                    You can extend <filename>FILESPATH</filename> variable
                    by using <filename>FILESEXTRAPATHS</filename>.
                </para>

                <para>
                    Best practices dictate that you accomplish this by using
                    <filename>FILESEXTRAPATHS</filename> from within a
                    <filename>.bbappend</filename> file and that you prepend
                    paths as follows:
                    <literallayout class='monospaced'>
     FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
                    </literallayout>
                    In the above example, the build system first looks for files
                    in a directory that has the same name as the corresponding
                    append file.
                    <note>
                        <para>When extending <filename>FILESEXTRAPATHS</filename>,
                        be sure to use the immediate expansion
                        (<filename>:=</filename>) operator.
                        Immediate expansion makes sure that BitBake evaluates
                        <link linkend='var-THISDIR'><filename>THISDIR</filename></link>
                        at the time the directive is encountered rather than at
                        some later time when expansion might result in a
                        directory that does not contain the files you need.
                        </para>
                        <para>Also, include the trailing separating colon
                        character if you are prepending.
                        The trailing colon character is necessary because you
                        are directing BitBake to extend the path by prepending
                        directories to the search path.</para>
                    </note>
                    Here is another common use:
                    <literallayout class='monospaced'>
     FILESEXTRAPATHS_prepend := "${THISDIR}/files:"
                    </literallayout>
                    In this example, the build system extends the
                    <filename>FILESPATH</filename> variable to include a
                    directory named <filename>files</filename> that is in the
                    same directory as the corresponding append file.
                </para>

                <para>
                    Here is a final example that specifically adds three paths:
                    <literallayout class='monospaced'>
     FILESEXTRAPATHS_prepend := "path_1:path_2:path_3:"
                    </literallayout>
                </para>

                <para>
                    By prepending paths in <filename>.bbappend</filename>
                    files, you allow multiple append files that reside in
                    different layers but are used for the same recipe to
                    correctly extend the path.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-FILESOVERRIDES'><glossterm>FILESOVERRIDES</glossterm>
            <glossdef>
                <para>
                    A subset of <link linkend='var-OVERRIDES'><filename>OVERRIDES</filename></link>
                    used by the OpenEmbedded build system for creating
                    <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link>.
                    You can find more information on how overrides are handled
                    in the BitBake Manual that is located at
                    <filename>bitbake/doc/manual</filename> in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                </para>

                <para>
                    By default, the <filename>FILESOVERRIDES</filename>
                    variable is defined as:
                    <literallayout class='monospaced'>
     FILESOVERRIDES = "${TRANSLATED_TARGET_ARCH}:${MACHINEOVERRIDES}:${DISTROOVERRIDES}"
                    </literallayout>

                    <note>
                        Do not hand-edit the <filename>FILESOVERRIDES</filename>
                        variable.
                        The values match up with expected overrides and are
                        used in an expected manner by the build system.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-FILESPATH'><glossterm>FILESPATH</glossterm>
            <glossdef>
                <para>
                    The default set of directories the OpenEmbedded build system
                    uses when searching for patches and files.
                    During the build process, BitBake searches each directory in
                    <filename>FILESPATH</filename> in the specified order when
                    looking for files and patches specified by each
                    <filename>file://</filename> URI in a recipe.
                </para>

                <para>
                    The default value for the <filename>FILESPATH</filename>
                    variable is defined in the <filename>base.bbclass</filename>
                    class found in <filename>meta/classes</filename> in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>:
                    <literallayout class='monospaced'>
     FILESPATH = "${@base_set_filespath(["${FILE_DIRNAME}/${BP}", \
        "${FILE_DIRNAME}/${BPN}", "${FILE_DIRNAME}/files"], d)}"
                    </literallayout>
                    <note>
                        Do not hand-edit the <filename>FILESPATH</filename>
                        variable.
                        If you want the build system to look in directories
                        other than the defaults, extend the
                        <filename>FILESPATH</filename> variable by using the
                        <link linkend='var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></link>
                        variable.
                    </note>
                    Be aware that the default <filename>FILESPATH</filename>
                    directories do not map to directories in custom layers
                    where append files (<filename>.bbappend</filename>)
                    are used.
                    If you want the build system to find patches or files
                    that reside with your append files, you need to extend
                    the <filename>FILESPATH</filename> variable by using
                    the
                    <link linkend='var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></link>
                    variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-FILESYSTEM_PERMS_TABLES'><glossterm>FILESYSTEM_PERMS_TABLES</glossterm>
            <glossdef>
                <para>Allows you to define your own file permissions settings table as part of
                    your configuration for the packaging process.
                    For example, suppose you need a consistent set of custom permissions for
                    a set of groups and users across an entire work project.
                    It is best to do this in the packages themselves but this is not always
                    possible.
                </para>
                <para>
                    By default, the OpenEmbedded build system uses the <filename>fs-perms.txt</filename>, which
                    is located in the <filename>meta/files</filename> folder in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                    If you create your own file permissions setting table, you should place it in your
                    layer or the distros layer.
                </para>
                <para>
                    You define the <filename>FILESYSTEM_PERMS_TABLES</filename> variable in the
                    <filename>conf/local.conf</filename> file, which is found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>, to
                    point to your custom <filename>fs-perms.txt</filename>.
                    You can specify more than a single file permissions setting table.
                    The paths you specify to these files must be defined within the
                    <link linkend='var-BBPATH'><filename>BBPATH</filename></link> variable.
                </para>
                <para>
                    For guidance on how to create your own file permissions settings table file,
                    examine the existing <filename>fs-perms.txt</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-FULL_OPTIMIZATION'><glossterm>FULL_OPTIMIZATION</glossterm>
            <glossdef>
                <para>
                    The options to pass in
                    <filename><link linkend='var-TARGET_CFLAGS'>TARGET_CFLAGS</link></filename>
                    and <filename><link linkend='var-CFLAGS'>CFLAGS</link></filename>
                    when compiling an optimized system.
                    This variable defaults to
                    "-fexpensive-optimizations -fomit-frame-pointer -frename-registers -O2".
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

<!--            <glossdiv id='var-glossary-g'><title>G</title>-->
<!--            </glossdiv>-->

    <glossdiv id='var-glossary-h'><title>H</title>

        <glossentry id='var-HOMEPAGE'><glossterm>HOMEPAGE</glossterm>
            <glossdef>
                <para>Website where more information about the software the recipe is building
                    can be found.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-HOST_SYS'><glossterm>HOST_SYS</glossterm>
            <glossdef>
                <para>
                    Specifies the system, including the architecture and the
                    operating system, for with the build is occurring
                    in the context of the current
                    recipe.
                    The OpenEmbedded build system automatically sets this
                    variable.
                    You do not need to set the variable yourself.
                </para>

                <para>
                    Here are two examples:
                    <itemizedlist>
                        <listitem><para>Given a native recipe on a 32-bit
                            x86 machine running Linux, the value is
                            "i686-linux".
                            </para></listitem>
                        <listitem><para>Given a recipe being built for a
                            little-endian MIPS target running Linux,
                            the value might be "mipsel-linux".
                            </para></listitem>
                    </itemizedlist>
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-i'><title>I</title>

        <glossentry id='var-IMAGE_FEATURES'><glossterm>IMAGE_FEATURES</glossterm>
            <glossdef>
                <para>
                    The primary list of features to include in an image.
                    Typically, you configure this variable in an image recipe.
                    Although you can use this variable from your
                    <filename>local.conf</filename> file, which is found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>,
                    best practices dictate that you do not.
                    <note>
                        To enable extra features from outside the image recipe,
                        use the
                        <filename><link linkend='var-EXTRA_IMAGE_FEATURES'>EXTRA_IMAGE_FEATURES</link></filename> variable.
                    </note>
                    For a list of image features that ships with the Yocto
                    Project, see the
                    "<link linkend="ref-features-image">Images</link>"
                    section.
                </para>

                <para>
                    For example that shows how to customize your image by
                    using this variable, see the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#usingpoky-extend-customimage-imagefeatures'>Customizing Images Using Custom <filename>IMAGE_FEATURES</filename> and <filename>EXTRA_IMAGE_FEATURES</filename></ulink>"
                    section in the Yocto Project Development Manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_FSTYPES'><glossterm>IMAGE_FSTYPES</glossterm>
            <glossdef>
                <para>Formats of root filesystem images that you want to have created.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_INSTALL'><glossterm>IMAGE_INSTALL</glossterm>
            <glossdef>
                <para>
                    Specifies the packages to install into an image.
                    The <filename>IMAGE_INSTALL</filename> variable is a mechanism for an image
                    recipe and you should use it with care to avoid ordering issues.
                </para>

                <para>
                    Image recipes set <filename>IMAGE_INSTALL</filename> to specify the
                    packages to install into an image through <filename>image.bbclass</filename>.
                    Additionally, "helper" classes exist, such as <filename>core-image.bbclass</filename>,
                    that can take
                    <filename><link linkend='var-IMAGE_FEATURES'>IMAGE_FEATURES</link></filename> lists
                    and turn these into auto-generated entries in
                    <filename>IMAGE_INSTALL</filename> in addition to its default contents.
                </para>

                <para>
                    Using <filename>IMAGE_INSTALL</filename> with the <filename>+=</filename>
                    operator from the <filename>/conf/local.conf</filename> file or from within
                    an image recipe is not recommended as it can cause ordering issues.
                    Since <filename>core-image.bbclass</filename> sets <filename>IMAGE_INSTALL</filename>
                    to a default value using the <filename>?=</filename> operator, using a
                    <filename>+=</filename> operation against <filename>IMAGE_INSTALL</filename>
                    will result in unexpected behavior when used in
                    <filename>/conf/local.conf</filename>.
                    Furthermore, the same operation from with an image recipe may or may not
                    succeed depending on the specific situation.
                    In both these cases, the behavior is contrary to how most users expect
                    the <filename>+=</filename> operator to work.
                </para>

                <para>
                    When you use this variable, it is best to use it as follows:
                    <literallayout class='monospaced'>
     IMAGE_INSTALL_append = " package-name"
                    </literallayout>
                    Be sure to include the space between the quotation character and the start of the
                    package name.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_LINGUAS'><glossterm>IMAGE_LINGUAS</glossterm>
            <glossdef>
                <para>
                    Specifies the list of locales to install into the image
                    during the root filesystem construction process.
                    The OpenEmbedded build system automatically splits locale
                    files, which are used for localization, into separate
                    packages.
                    Setting the <filename>IMAGE_LINGUAS</filename> variable
                    ensures that any locale packages that correspond to packages
                    already selected for installation into the image are also
                    installed.
                    Here is an example:
                    <literallayout class='monospaced'>
     IMAGE_LINGUAS = "pt-br de-de"
                    </literallayout>
                    In this example, the build system ensures any Brazilian
                    Portuguese and German locale files that correspond to
                    packages in the image are installed (i.e.
                    <filename>*-locale-pt-br</filename>
                    and <filename>*-locale-de-de</filename> as well as
                    <filename>*-locale-pt</filename>
                    and <filename>*-locale-de</filename>, since some software
                    packages only provide locale files by language and not by
                    country-specific language).
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_OVERHEAD_FACTOR'><glossterm>IMAGE_OVERHEAD_FACTOR</glossterm>
            <glossdef>
                <para>
                    Defines a multiplier that the build system applies to the initial image
                    size for cases when the multiplier times the returned disk usage value
                    for the image is greater than the sum of
                    <filename><link linkend='var-IMAGE_ROOTFS_SIZE'>IMAGE_ROOTFS_SIZE</link></filename>
                    and
                    <filename><link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'>IMAGE_ROOTFS_EXTRA_SPACE</link></filename>.
                    The result of the multiplier applied to the initial image size creates
                    free disk space in the image as overhead.
                    By default, the build process uses a multiplier of 1.3 for this variable.
                    This default value results in 30% free disk space added to the image when this
                    method is used to determine the final generated image size.
                    You should be aware that post install scripts and the package management
                    system uses disk space inside this overhead area.
                    Consequently, the multiplier does not produce an image with
                    all the theoretical free disk space.
                    See <filename><link linkend='var-IMAGE_ROOTFS_SIZE'>IMAGE_ROOTFS_SIZE</link></filename>
                    for information on how the build system determines the overall image size.
                </para>

                <para>
                    The default 30% free disk space typically gives the image enough room to boot
                    and allows for basic post installs while still leaving a small amount of
                    free disk space.
                    If 30% free space is inadequate, you can increase the default value.
                    For example, the following setting gives you 50% free space added to the image:
                    <literallayout class='monospaced'>
     IMAGE_OVERHEAD_FACTOR = "1.5"
                    </literallayout>
                </para>

                <para>
                    Alternatively, you can ensure a specific amount of free disk space is added
                    to the image by using
                    <filename><link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'>IMAGE_ROOTFS_EXTRA_SPACE</link></filename>
                    the variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_ROOTFS_EXTRA_SPACE'><glossterm>IMAGE_ROOTFS_EXTRA_SPACE</glossterm>
            <glossdef>
                <para>
                    Defines additional free disk space created in the image in Kbytes.
                    By default, this variable is set to "0".
                    This free disk space is added to the image after the build system determines
                    the image size as described in
                    <filename><link linkend='var-IMAGE_ROOTFS_SIZE'>IMAGE_ROOTFS_SIZE</link></filename>.
                </para>

                <para>
                    This variable is particularly useful when you want to ensure that a
                    specific amount of free disk space is available on a device after an image
                    is installed and running.
                    For example, to be sure 5 Gbytes of free disk space is available, set the
                    variable as follows:
                    <literallayout class='monospaced'>
     IMAGE_ROOTFS_EXTRA_SPACE = "5242880"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IMAGE_ROOTFS_SIZE'><glossterm>IMAGE_ROOTFS_SIZE</glossterm>
            <glossdef>
                <para>
                    Defines the size in Kbytes for the generated image.
                    The OpenEmbedded build system determines the final size for the generated
                    image using an algorithm that takes into account the initial disk space used
                    for the generated image, a requested size for the image, and requested
                    additional free disk space to be added to the image.
                    Programatically, the build system determines the final size of the
                    generated image as follows:
                    <literallayout class='monospaced'>
    if (image-du * overhead) &lt; rootfs-size:
	internal-rootfs-size = rootfs-size + xspace
    else:
	internal-rootfs-size = (image-du * overhead) + xspace

    where:

      image-du = Returned value of the du command on
                 the image.

      overhead = IMAGE_OVERHEAD_FACTOR

      rootfs-size = IMAGE_ROOTFS_SIZE

      internal-rootfs-size = Initial root filesystem
                             size before any modifications.

      xspace = IMAGE_ROOTFS_EXTRA_SPACE
                    </literallayout>
                    See the <link linkend='var-IMAGE_OVERHEAD_FACTOR'><filename>IMAGE_OVERHEAD_FACTOR</filename></link>
                    and <link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'><filename>IMAGE_ROOTFS_EXTRA_SPACE</filename></link>
                    variables for related information.
<!--                    In the above example, <filename>overhead</filename> is defined by the
                    <filename><link linkend='var-IMAGE_OVERHEAD_FACTOR'>IMAGE_OVERHEAD_FACTOR</link></filename>
                    variable, <filename>xspace</filename> is defined by the
                    <filename><link linkend='var-IMAGE_ROOTFS_EXTRA_SPACE'>IMAGE_ROOTFS_EXTRA_SPACE</link></filename>
                    variable, and <filename>du</filename> is the results of the disk usage command
                    on the initially generated image. -->
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INC_PR'><glossterm>INC_PR</glossterm>
            <glossdef>
                <para>Helps define the recipe revision for recipes that share
                    a common <filename>include</filename> file.
                    You can think of this variable as part of the recipe revision
                    as set from within an include file.</para>
                <para>Suppose, for example, you have a set of recipes that
                    are used across several projects.
                    And, within each of those recipes the revision
                    (its <link linkend='var-PR'><filename>PR</filename></link>
                    value) is set accordingly.
                    In this case, when the revision of those recipes changes,
                    the burden is on you to find all those recipes and
                    be sure that they get changed to reflect the updated
                    version of the recipe.
                    In this scenario, it can get complicated when recipes
                    that are used in many places and provide common functionality
                    are upgraded to a new revision.</para>
                <para>A more efficient way of dealing with this situation is
                    to set the <filename>INC_PR</filename> variable inside
                    the <filename>include</filename> files that the recipes
                    share and then expand the <filename>INC_PR</filename>
                    variable within the recipes to help
                    define the recipe revision.
                    </para>
                <para>
                    The following provides an example that shows how to use
                    the <filename>INC_PR</filename> variable
                    given a common <filename>include</filename> file that
                    defines the variable.
                    Once the variable is defined in the
                    <filename>include</filename> file, you can use the
                    variable to set the <filename>PR</filename> values in
                    each recipe.
                    You will notice that when you set a recipe's
                    <filename>PR</filename> you can provide more granular
                    revisioning by appending values to the
                    <filename>INC_PR</filename> variable:
                    <literallayout class='monospaced'>
recipes-graphics/xorg-font/xorg-font-common.inc:INC_PR = "r2"
recipes-graphics/xorg-font/encodings_1.0.4.bb:PR = "${INC_PR}.1"
recipes-graphics/xorg-font/font-util_1.3.0.bb:PR = "${INC_PR}.0"
recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
                    </literallayout>
                    The first line of the example establishes the baseline
                    revision to be used for all recipes that use the
                    <filename>include</filename> file.
                    The remaining lines in the example are from individual
                    recipes and show how the <filename>PR</filename> value
                    is set.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INHIBIT_DEFAULT_DEPS'><glossterm>INHIBIT_DEFAULT_DEPS</glossterm>
            <glossdef>
                <para>
                    Prevents the default dependencies, namely the C compiler
                    and standard C library (libc), from being added to
                    <link linkend='var-DEPENDS'><filename>DEPENDS</filename></link>.
                    This variable is usually used within recipes that do not
                    require any compilation using the C compiler.
                </para>

                <para>
                    Set the variable to "1" to prevent the default dependencies
                    from being added.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INHIBIT_PACKAGE_STRIP'><glossterm>INHIBIT_PACKAGE_STRIP</glossterm>
            <glossdef>
                <para>
                    If set to "1", causes the build to not strip binaries in resulting packages.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INHERIT'><glossterm>INHERIT</glossterm>
            <glossdef>
                <para>
                    Causes the named class to be inherited at
                    this point during parsing.
                    The variable is only valid in configuration files.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INITRAMFS_FSTYPES'><glossterm>INITRAMFS_FSTYPES</glossterm>
            <glossdef>
                <para>
                    Defines the format for the output image of an initial
                    RAM disk (initramfs), which is used during boot.
                    Supported formats are the same as those supported by the
                    <link linkend='var-IMAGE_FSTYPES'><filename>IMAGE_FSTYPES</filename></link>
                    variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INITSCRIPT_PACKAGES'><glossterm>INITSCRIPT_PACKAGES</glossterm>
            <glossdef>
                <para>
                    A list of the packages that contain initscripts.
                    If multiple packages are specified, you need to append the package name
                    to the other <filename>INITSCRIPT_*</filename> as an override.</para>
                 <para>
                    This variable is used in recipes when using <filename>update-rc.d.bbclass</filename>.
                    The variable is optional and defaults to the
                    <link linkend='var-PN'><filename>PN</filename></link> variable.
                </para>
           </glossdef>
        </glossentry>

        <glossentry id='var-INITSCRIPT_NAME'><glossterm>INITSCRIPT_NAME</glossterm>
            <glossdef>
                <para>
                    The filename of the initscript as installed to <filename>${etcdir}/init.d</filename>.
                </para>
                <para>
                    This variable is used in recipes when using <filename>update-rc.d.bbclass</filename>.
                    The variable is Mandatory.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INITSCRIPT_PARAMS'><glossterm>INITSCRIPT_PARAMS</glossterm>
            <glossdef>
                <para>
                    Specifies the options to pass to <filename>update-rc.d</filename>.
                    Here is an example:
                    <literallayout class='monospaced'>
     INITSCRIPT_PARAMS = "start 99 5 2 . stop 20 0 1 6 ."
                    </literallayout>
                    In this example, the script has a runlevel of 99,
                    starts the script in initlevels 2 and 5, and
                    stops the script in levels 0, 1 and 6.
                </para>
                <para>
                    The variable is mandatory and is used in recipes when using
                    <filename>update-rc.d.bbclass</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-INSANE_SKIP'><glossterm>INSANE_SKIP</glossterm>
            <glossdef>
                <para>
                    Specifies the QA checks to skip for a specific package
                    within a recipe.
                    For example, to skip the check for symbolic link
                    <filename>.so</filename> files in the main package of a
                    recipe, add the following to the recipe.
                    The package name override must be used, which in this
                    example is <filename>${PN}</filename>:
                    <literallayout class='monospaced'>
     INSANE_SKIP_${PN} += "dev-so"
                    </literallayout>
                </para>
                <para>
                    See the "<link linkend='ref-classes-insane'>Generated Output Quality Assurance Checks - <filename>insane.bbclass</filename></link>"
                    section for a list of the valid QA checks you can
                    specify using this variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-IPK_FEED_URIS'><glossterm>INSANE_SKIP</glossterm>
            <glossdef>
                <para>
                    Helps users set up an additional package feed area on
                    a server for packages you might want to install on a
                    target that is running an image.
                    Once the feed is established, you can perform
                    installations or upgrades using the package manager
                    at runtime (e.g. <filename>opkg</filename>).
                </para>
            </glossdef>
        </glossentry>

<!--
        <glossentry id='var-INTERCEPT_DIR'><glossterm>INTERCEPT_DIR</glossterm>
            <glossdef>
                <para>
                    An environment variable that defines the directory where
                    post installation hooks are installed for the
                    post install environment.
                    This variable is fixed as follows:
                    <literallayout class='monospaced'>
     ${WORKDIR}/intercept_scripts
                    </literallayout>
                </para>

                <para>
                    After installation of a target's root filesystem,
                    post installation scripts, which are essentially bash scripts,
                    are all executed just a single time.
                    Limiting execution of these scripts minimizes installation
                    time that would be lengthened due to  certain packages
                    triggering redundant operations.
                    For example, consider the installation of font packages
                    as a common example.
                    Without limiting the execution of post installation scripts,
                    all font directories would be rescanned to create the
                    cache after each individual font package was installed.
                </para>

                <para>
                    Do not edit the <filename>INTERCEPT_DIR</filename>
                    variable.
                </para>
            </glossdef>
        </glossentry>
-->

    </glossdiv>

<!--            <glossdiv id='var-glossary-j'><title>J</title>-->
<!--            </glossdiv>-->

   <glossdiv id='var-glossary-k'><title>K</title>

        <glossentry id='var-KARCH'><glossterm>KARCH</glossterm>
            <glossdef>
                <para>
                    Defines the kernel architecture used when assembling
                    the configuration.
                    Architectures supported for this release are:
                    <literallayout class='monospaced'>
     powerpc
     arm
     i386
     mips
     powerpc
     x86_64
                    </literallayout>
                </para>

                <para>
                    You define the <filename>KARCH</filename> variable in the
                    <ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#bsp-descriptions'>BSP Descriptions</ulink>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KBRANCH'><glossterm>KBRANCH</glossterm>
            <glossdef>
                <para>
                    A regular expression used by the build process to explicitly identify the kernel
                    branch that is validated, patched and configured during a build.
                    The <filename>KBRANCH</filename> variable is optional.
                    You can use it to trigger checks to ensure the exact kernel branch you want is
                    being used by the build process.
                </para>

                <para>
                    Values for this variable are set in the kernel's recipe file and the kernel's
                    append file.
                    For example, if you are using the Yocto Project kernel that is based on the
                    Linux 3.4 kernel, the kernel recipe file is the
                    <filename>meta/recipes-kernel/linux/linux-yocto_3.4.bb</filename> file.
                    Following is the default value for <filename>KBRANCH</filename> and the default
                    override for the architectures the Yocto Project supports:
                    <literallayout class='monospaced'>
     KBRANCH_DEFAULT = "standard/base"
     KBRANCH = "${KBRANCH_DEFAULT}"
                    </literallayout>
                    This branch exists in the <filename>linux-yocto-3.4</filename> kernel Git
                    repository <ulink url='&YOCTO_GIT_URL;/cgit.cgi/linux-yocto-3.4/refs/heads'></ulink>.
                </para>

                <para>
                    This variable is also used from the kernel's append file to identify the kernel
                    branch specific to a particular machine or target hardware.
                    The kernel's append file is located in the BSP layer for a given machine.
                    For example, the kernel append file for the Crown Bay BSP is in the
                    <filename>meta-intel</filename> Git repository and is named
                    <filename>meta-crownbay/recipes-kernel/linux/linux-yocto_3.4.bbappend</filename>.
                    Here are the related statements from the append file:
                    <literallayout class='monospaced'>
     COMPATIBLE_MACHINE_crownbay = "crownbay"
     KMACHINE_crownbay  = "crownbay"
     KBRANCH_crownbay  = "standard/crownbay"

     COMPATIBLE_MACHINE_crownbay-noemgd = "crownbay-noemgd"
     KMACHINE_crownbay-noemgd  = "crownbay"
     KBRANCH_crownbay-noemgd  = "standard/crownbay"
                    </literallayout>
                        The <filename>KBRANCH_*</filename> statements identify the kernel branch to
                        use when building for the Crown Bay BSP.
                        In this case there are two identical statements: one for each type of
                        Crown Bay machine.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KBRANCH_DEFAULT'><glossterm>KBRANCH_DEFAULT</glossterm>
            <glossdef>
                <para>
                    Defines the Linux kernel source repository's default
                    branch used to build the Linux kernel.
                    The <filename>KBRANCH_DEFAULT</filename> value is
                    the default value for
                    <link linkend='var-KBRANCH'><filename>KBRANCH</filename></link>.
                    Unless you specify otherwise,
                    <filename>KBRANCH_DEFAULT</filename> initializes to
                    "master".
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KERNEL_EXTRA_ARGS'><glossterm>KERNEL_EXTRA_ARGS</glossterm>
            <glossdef>
                <para>
                    Specifies additional <filename>make</filename>
                    command-line arguments the OpenEmbedded build system
                    passes on when compiling the kernel.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KERNEL_FEATURES'><glossterm>KERNEL_FEATURES</glossterm>
            <glossdef>
                <para>Includes additional metadata from the Yocto Project kernel Git repository.
                    In the OpenEmbedded build system, the default Board Support Packages (BSPs)
                    <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>
                    is provided through
                    the <link linkend='var-KMACHINE'><filename>KMACHINE</filename></link>
                    and <link linkend='var-KBRANCH'><filename>KBRANCH</filename></link> variables.
                    You can use the <filename>KERNEL_FEATURES</filename> variable to further
                    add metadata for all BSPs.</para>
                <para>The metadata you add through this variable includes config fragments and
                    features descriptions,
                    which usually includes patches as well as config fragments.
                    You typically override the <filename>KERNEL_FEATURES</filename> variable
                    for a specific machine.
                    In this way, you can provide validated, but optional, sets of kernel
                    configurations and features.</para>
                <para>For example, the following adds <filename>netfilter</filename> to all
                    the Yocto Project kernels and adds sound support to the <filename>qemux86</filename>
                    machine:
                    <literallayout class='monospaced'>
     # Add netfilter to all linux-yocto kernels
     KERNEL_FEATURES="features/netfilter"

     # Add sound support to the qemux86 machine
     KERNEL_FEATURES_append_qemux86=" cfg/sound"
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KERNEL_IMAGETYPE'><glossterm>KERNEL_IMAGETYPE</glossterm>
            <glossdef>
                <para>The type of kernel to build for a device, usually set by the
                    machine configuration files and defaults to "zImage".
                    This variable is used
                    when building the kernel and is passed to <filename>make</filename> as the target to
                    build.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KERNEL_PATH'><glossterm>KERNEL_PATH</glossterm>
            <glossdef>
                <para>
                    The location of the kernel sources.
                    This variable is set to the value of the
                    <link linkend='var-STAGING_KERNEL_DIR'><filename>STAGING_KERNEL_DIR</filename></link>
                    within the <filename>module.bbclass</filename> class.
                    For information on how this variable is used, see the
                    "<ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#incorporating-out-of-tree-modules'>Incorporating Out-of-Tree Modules</ulink>"
                    section.
                </para>

                <para>
                    The <link linkend='var-KERNEL_SRC'><filename>KERNEL_SRC</filename></link>
                    variable is identical to the <filename>KERNEL_PATH</filename>
                    variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KERNEL_SRC'><glossterm>KERNEL_SRC</glossterm>
            <glossdef>
                <para>
                    The location of the kernel sources.
                    This variable is set to the value of the
                    <link linkend='var-STAGING_KERNEL_DIR'><filename>STAGING_KERNEL_DIR</filename></link>
                    within the <filename>module.bbclass</filename> class.
                    For information on how this variable is used, see the
                    "<ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#incorporating-out-of-tree-modules'>Incorporating Out-of-Tree Modules</ulink>"
                    section.
                </para>

                <para>
                    The <link linkend='var-KERNEL_PATH'><filename>KERNEL_PATH</filename></link>
                    variable is identical to the <filename>KERNEL_SRC</filename>
                    variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KFEATURE_DESCRIPTION'><glossterm>KFEATURE_DESCRIPTION</glossterm>
            <glossdef>
                <para>
                    Provides a short description of a configuration fragment.
                    You use this variable in the <filename>.scc</filename>
                    file that describes a configuration fragment file.
                    Here is the variable used in a file named
                    <filename>smp.scc</filename> to describe SMP being
                    enabled:
                    <literallayout class='monospaced'>
     define KFEATURE_DESCRIPTION "Enable SMP"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KMACHINE'><glossterm>KMACHINE</glossterm>
            <glossdef>
                <para>
                    The machine as known by the kernel.
                    Sometimes the machine name used by the kernel does not match the machine name
                    used by the OpenEmbedded build system.
                    For example, the machine name that the OpenEmbedded build system understands as
                    <filename>qemuarm</filename> goes by a different name in the Linux Yocto kernel.
                    The kernel understands that machine as <filename>arm_versatile926ejs</filename>.
                    For cases like these, the <filename>KMACHINE</filename> variable maps the
                    kernel machine name to the OpenEmbedded build system machine name.
                </para>

                <para>
                    Kernel machine names are initially defined in the
                    Yocto Linux Kernel's <filename>meta</filename> branch.
                    From the <filename>meta</filename> branch, look in
                    the <filename>meta/cfg/kernel-cache/bsp/&lt;bsp_name&gt;/&lt;bsp-name&gt;-&lt;kernel-type&gt;.scc</filename> file.
                    For example, from the <filename>meta</filename> branch in the
                    <filename>linux-yocto-3.0</filename> kernel, the
                    <filename>meta/cfg/kernel-cache/bsp/cedartrail/cedartrail-standard.scc</filename> file
                    has the following:
                    <literallayout class='monospaced'>
     define KMACHINE cedartrail
     define KTYPE standard
     define KARCH i386

     include ktypes/standard
     branch cedartrail

     include cedartrail.scc
                    </literallayout>
                    You can see that the kernel understands the machine name for
                    the Cedar Trail Board Support Package (BSP) as
                    <filename>cedartrail</filename>.
                </para>

                <para>
                    If you look in the Cedar Trail BSP layer in the
                    <filename>meta-intel</filename>
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-repositories'>Source Repositories</ulink>
                    at <filename>meta-cedartrail/recipes-kernel/linux/linux-yocto_3.0.bbappend</filename>,
                    you will find the following statements among others:
                    <literallayout class='monospaced'>
     COMPATIBLE_MACHINE_cedartrail = "cedartrail"
     KMACHINE_cedartrail  = "cedartrail"
     KBRANCH_cedartrail  = "yocto/standard/cedartrail"
     KERNEL_FEATURES_append_cedartrail += "bsp/cedartrail/cedartrail-pvr-merge.scc"
     KERNEL_FEATURES_append_cedartrail += "cfg/efi-ext.scc"

     COMPATIBLE_MACHINE_cedartrail-nopvr = "cedartrail"
     KMACHINE_cedartrail-nopvr  = "cedartrail"
     KBRANCH_cedartrail-nopvr  = "yocto/standard/cedartrail"
     KERNEL_FEATURES_append_cedartrail-nopvr += " cfg/smp.scc"
                    </literallayout>
                    The <filename>KMACHINE</filename> statements in the kernel's append file make sure that
                    the OpenEmbedded build system and the Yocto Linux kernel understand the same machine
                    names.
                </para>

                <para>
                    This append file uses two <filename>KMACHINE</filename> statements.
                    The first is not really necessary but does ensure that the machine known to the
                    OpenEmbedded build system as <filename>cedartrail</filename> maps to the machine
                    in the kernel also known as <filename>cedartrail</filename>:
                    <literallayout class='monospaced'>
     KMACHINE_cedartrail  = "cedartrail"
                    </literallayout>
                </para>

                <para>
                    The second statement is a good example of why the <filename>KMACHINE</filename> variable
                    is needed.
                    In this example, the OpenEmbedded build system uses the <filename>cedartrail-nopvr</filename>
                    machine name to refer to the Cedar Trail BSP that does not support the proprietary
                    PowerVR driver.
                    The kernel, however, uses the machine name <filename>cedartrail</filename>.
                    Thus, the append file must map the <filename>cedartrail-nopvr</filename> machine name to
                    the kernel's <filename>cedartrail</filename> name:
                    <literallayout class='monospaced'>
     KMACHINE_cedartrail-nopvr  = "cedartrail"
                    </literallayout>
                </para>

                <para>
                    BSPs that ship with the Yocto Project release provide all mappings between the Yocto
                    Project kernel machine names and the OpenEmbedded machine names.
                    Be sure to use the <filename>KMACHINE</filename> if you create a BSP and the machine
                    name you use is different than that used in the kernel.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-KTYPE'><glossterm>KTYPE</glossterm>
            <glossdef>
                <para>
                    Defines the kernel type to be used in assembling the
                    configuration.
                    The linux-yocto recipes define "standard", "tiny",
                    and "preempt-rt" kernel types.
                    See the
                    "<ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#kernel-types'>Kernel Types</ulink>"
                    section in the Yocto Project Linux Kernel Development
                    Manual for more information on kernel types.
                </para>

                <para>
                    You define the <filename>KTYPE</filename> variable in the
                    <ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#bsp-descriptions'>BSP Descriptions</ulink>.
                    The value you use must match the value used for the
                    <link linkend='var-LINUX_KERNEL_TYPE'><filename>LINUX_KERNEL_TYPE</filename></link>
                    value used by the kernel recipe.
                </para>
            </glossdef>
        </glossentry>
   </glossdiv>

    <glossdiv id='var-glossary-l'><title>L</title>

        <glossentry id='var-LAYERDEPENDS'><glossterm>LAYERDEPENDS</glossterm>
            <glossdef>
                <para>Lists the layers that this recipe depends upon, separated by spaces.
                    Optionally, you can specify a specific layer version for a dependency
                    by adding it to the end of the layer name with a colon, (e.g. "anotherlayer:3"
                    to be compared against
                    <link linkend='var-LAYERVERSION'><filename>LAYERVERSION</filename></link><filename>_anotherlayer</filename>
                    in this case).
                    An error will be produced if any dependency is missing or
                    the version numbers do not match exactly (if specified).
                    This variable is used in the <filename>conf/layer.conf</filename> file
                    and must be suffixed with the name of the specific layer (e.g.
                    <filename>LAYERDEPENDS_mylayer</filename>).</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LAYERDIR'><glossterm>LAYERDIR</glossterm>
            <glossdef>
                <para>When used inside the <filename>layer.conf</filename> configuration
                    file, this variable provides the path of the current layer.
                    This variable is not available outside of <filename>layer.conf</filename>
                    and references are expanded immediately when parsing of the file completes.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LAYERVERSION'><glossterm>LAYERVERSION</glossterm>
            <glossdef>
                <para>Optionally specifies the version of a layer as a single number.
                    You can use this within
                    <link linkend='var-LAYERDEPENDS'><filename>LAYERDEPENDS</filename></link>
                    for another layer in order to depend on a specific version
                    of the layer.
                    This variable is used in the <filename>conf/layer.conf</filename> file
                    and must be suffixed with the name of the specific layer (e.g.
                    <filename>LAYERVERSION_mylayer</filename>).</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LIC_FILES_CHKSUM'><glossterm>LIC_FILES_CHKSUM</glossterm>
            <glossdef>
                <para>Checksums of the license text in the recipe source code.</para>
                <para>This variable tracks changes in license text of the source
                    code files.
                    If the license text is changed, it will trigger a build
                    failure, which gives the developer an opportunity to review any
                    license change.</para>
                <para>
                    This variable must be defined for all recipes (unless
                    <link linkend='var-LICENSE'><filename>LICENSE</filename></link>
                    is set to "CLOSED")</para>
                <para>For more information, see the
                    <link linkend='usingpoky-configuring-LIC_FILES_CHKSUM'>
                    Tracking License Changes</link> section</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LICENSE'><glossterm>LICENSE</glossterm>
            <glossdef>
                <para>
                    The list of source licenses for the recipe.
                    Follow these rules:
                    <itemizedlist>
                        <listitem><para>Do not use spaces within individual
                            license names.</para></listitem>
                        <listitem><para>Separate license names using
                            | (pipe) when there is a choice between licenses.
                            </para></listitem>
                        <listitem><para>Separate license names using
                            &amp; (ampersand) when multiple licenses exist
                            that cover different parts of the source.
                            </para></listitem>
                        <listitem><para>You can use spaces between license
                            names.</para></listitem>
                    </itemizedlist>
                </para>

                <para>
                    Here are some examples:
                    <literallayout class='monospaced'>
     LICENSE = "LGPLv2.1 | GPLv3"
     LICENSE = "MPL-1 &amp; LGPLv2.1"
     LICENSE = "GPLv2+"
                    </literallayout>
                    The first example is from the recipes for Qt, which the user
                    may choose to distribute under either the LGPL version
                    2.1 or GPL version 3.
                    The second example is from Cairo where two licenses cover
                    different parts of the source code.
                    The final example is from <filename>sysstat</filename>,
                    which presents a single license.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LICENSE_PATH'><glossterm>LICENSE_PATH</glossterm>
            <glossdef>
                <para>Path to additional licenses used during the build.
                    By default, the OpenEmbedded build system uses <filename>COMMON_LICENSE_DIR</filename>
                    to define the directory that holds common license text used during the build.
                    The <filename>LICENSE_PATH</filename> variable allows you to extend that
                    location to other areas that have additional licenses:
                    <literallayout class='monospaced'>
     LICENSE_PATH += "/path/to/additional/common/licenses"
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LINUX_KERNEL_TYPE'><glossterm>LINUX_KERNEL_TYPE</glossterm>
            <glossdef>
                <para>
                    Defines the kernel type to be used in assembling the
                    configuration.
                    The linux-yocto recipes define "standard", "tiny", and
                    "preempt-rt" kernel types.
                    See the
                    "<ulink url='&YOCTO_DOCS_KERNEL_DEV_URL;#kernel-types'>Kernel Types</ulink>"
                    section in the Yocto Project Linux Kernel Development
                    Manual for more information on kernel types.
                </para>

                <para>
                    If you do not specify a
                    <filename>LINUX_KERNEL_TYPE</filename>, it defaults to
                    "standard".
                    Together with
                    <link linkend='var-KMACHINE'><filename>KMACHINE</filename></link>,
                    the <filename>LINUX_KERNEL_TYPE</filename> variable
                    defines the search
                    arguments used by the kernel tools to find the appropriate
                    description within the kernel
                    <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>
                    with which to build out the sources and configuration.
                    </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LINUX_VERSION'><glossterm>LINUX_VERSION</glossterm>
            <glossdef>
                <para>The Linux version from <filename>kernel.org</filename>
                    on which the Linux kernel image being built using the
                    OpenEmbedded build system is based.
                    You define this variable in the kernel recipe.
                    For example, the <filename>linux-yocto-3.4.bb</filename>
                    kernel recipe found in
                    <filename>meta/recipes-kernel/linux</filename>
                    defines the variables as follows:
                    <literallayout class='monospaced'>
     LINUX_VERSION ?= "3.4.24"
                    </literallayout>
                    The <filename>LINUX_VERSION</filename> variable is used to
                    define <link linkend='var-PV'><filename>PV</filename></link>
                    for the recipe:
                    <literallayout class='monospaced'>
     PV = "${LINUX_VERSION}+git${SRCPV}"
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LINUX_VERSION_EXTENSION'><glossterm>LINUX_VERSION_EXTENSION</glossterm>
            <glossdef>
                <para>A string extension compiled into the version
                    string of the Linux kernel built with the OpenEmbedded
                    build system.
                    You define this variable in the kernel recipe.
                    For example, the linux-yocto kernel recipes all define
                    the variable as follows:
                    <literallayout class='monospaced'>
     LINUX_VERSION_EXTENSION ?= "-yocto-${<link linkend='var-LINUX_KERNEL_TYPE'>LINUX_KERNEL_TYPE</link>}"
                    </literallayout>
                    Defining this variable essentially sets the
                    Linux kernel configuration item
                    <filename>CONFIG_LOCALVERSION</filename>, which is visible
                    through the <filename>uname</filename> command.
                    Here is an example that shows the extension assuming it
                    was set as previously shown:
                    <literallayout class='monospaced'>
     $ uname -r
     3.7.0-rc8-custom
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-LOG_DIR'><glossterm>LOG_DIR</glossterm>
            <glossdef>
                <para>
                    Specifies the directory to which the OpenEmbedded build
                    system writes overall log files.
                    The default directory is <filename>${TMPDIR}/log</filename>.
                </para>
                <para>
                    For the directory containing logs specific to each task,
                    see the <link linkend='var-T'><filename>T</filename></link>
                    variable.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-m'><title>M</title>

         <glossentry id='var-MACHINE'><glossterm>MACHINE</glossterm>
            <glossdef>
                <para>
                    Specifies the target device for which the image is built.
                    You define <filename>MACHINE</filename> in the
                    <filename>local.conf</filename> file found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    By default, <filename>MACHINE</filename> is set to
                    "qemux86", which is an x86-based architecture machine to
                    be emulated using QEMU:
                    <literallayout class='monospaced'>
     MACHINE ?= "qemux86"
                    </literallayout>
                    The variable corresponds to a machine configuration file of the
                    same name, through which machine-specific configurations are set.
                    Thus, when <filename>MACHINE</filename> is set to "qemux86" there
                    exists the corresponding <filename>qemux86.conf</filename> machine
                    configuration file, which can be found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
                    in <filename>meta/conf/machine</filename>.
                </para>

                <para>
                    The list of machines supported by the Yocto Project as
                    shipped include the following:
                    <literallayout class='monospaced'>
     MACHINE ?= "qemuarm"
     MACHINE ?= "qemumips"
     MACHINE ?= "qemuppc"
     MACHINE ?= "qemux86"
     MACHINE ?= "qemux86-64"
     MACHINE ?= "atom-pc"
     MACHINE ?= "beagleboard"
     MACHINE ?= "mpc8315e-rdb"
     MACHINE ?= "routerstationpro"
                    </literallayout>
                    The last four are Yocto Project reference hardware boards, which
                    are provided in the <filename>meta-yocto-bsp</filename> layer.
                    <note>Adding additional Board Support Package (BSP) layers
                        to your configuration adds new possible settings for
                        <filename>MACHINE</filename>.
                    </note>
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS'><glossterm>MACHINE_ESSENTIAL_EXTRA_RDEPENDS</glossterm>
            <glossdef>
                <para></para>
                <para>
                    A list of required machine-specific packages to install as part of
                    the image being built.
                    The build process depends on these packages being present.
                    Furthermore, because this is a "machine essential" variable, the list of
                    packages are essential for the machine to boot.
                    The impact of this variable affects images based on
                    <filename>packagegroup-core-boot</filename>,
                    including the <filename>core-image-minimal</filename> image.
                </para>
                <para>
                    This variable is similar to the
                    <filename><link linkend='var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS'>MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS</link></filename>
                    variable with the exception that the image being built has a build
                    dependency on the variable's list of packages.
                    In other words, the image will not build if a file in this list is not found.
                </para>
                <para>
                    As an example, suppose the machine for which you are building requires
                    <filename>example-init</filename> to be run during boot to initialize the hardware.
                    In this case, you would use the following in the machine's
                    <filename>.conf</filename> configuration file:
                    <literallayout class='monospaced'>
     MACHINE_ESSENTIAL_EXTRA_RDEPENDS += "example-init"
                    </literallayout>
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS'><glossterm>MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS</glossterm>
            <glossdef>
                <para></para>
                <para>
                    A list of recommended machine-specific packages to install as part of
                    the image being built.
                    The build process does not depend on these packages being present.
                    However, because this is a "machine essential" variable, the list of
                    packages are essential for the machine to boot.
                    The impact of this variable affects images based on
                    <filename>packagegroup-core-boot</filename>,
                    including the <filename>core-image-minimal</filename> image.
                </para>
                <para>
                    This variable is similar to the
                    <filename><link linkend='var-MACHINE_ESSENTIAL_EXTRA_RDEPENDS'>MACHINE_ESSENTIAL_EXTRA_RDEPENDS</link></filename>
                    variable with the exception that the image being built does not have a build
                    dependency on the variable's list of packages.
                    In other words, the image will still build if a package in this list is not found.
                    Typically, this variable is used to handle essential kernel modules, whose
                    functionality may be selected to be built into the kernel rather than as a module,
                    in which case a package will not be produced.
                </para>
                <para>
                    Consider an example where you have a custom kernel where a specific touchscreen
                    driver is required for the machine to be usable.
                    However, the driver can be built as a module or
                    into the kernel depending on the kernel configuration.
                    If the driver is built as a module, you want it to be installed.
                    But, when the driver is built into the kernel, you still want the
                    build to succeed.
                    This variable sets up a "recommends" relationship so that in the latter case,
                    the build will not fail due to the missing package.
                    To accomplish this, assuming the package for the module was called
                    <filename>kernel-module-ab123</filename>, you would use the
                    following in the machine's <filename>.conf</filename> configuration
                    file:
                    <literallayout class='monospaced'>
     MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += "kernel-module-ab123"
                    </literallayout>
                </para>
                <para>
                    Some examples of these machine essentials are flash, screen, keyboard, mouse,
                    or touchscreen drivers (depending on the machine).
                </para>
            </glossdef>
        </glossentry>

         <glossentry id='var-MACHINE_EXTRA_RDEPENDS'><glossterm>MACHINE_EXTRA_RDEPENDS</glossterm>
            <glossdef>
                <para>
                    A list of machine-specific packages to install as part of the
                    image being built that are not essential for the machine to boot.
                    However, the build process for more fully-featured images
                    depends on the packages being present.
                </para>
                <para>
                    This variable affects all images based on
                    <filename>packagegroup-base</filename>, which does not include the
                    <filename>core-image-minimal</filename> or <filename>core-image-basic</filename>
                    images.
                </para>
                <para>
                    The variable is similar to the
                    <filename><link linkend='var-MACHINE_EXTRA_RRECOMMENDS'>MACHINE_EXTRA_RRECOMMENDS</link></filename>
                    variable with the exception that the image being built has a build
                    dependency on the variable's list of packages.
                    In other words, the image will not build if a file in this list is not found.
                </para>
                <para>
                    An example is a machine that has WiFi capability but is not
                    essential for the machine to boot the image.
                    However, if you are building a more fully-featured image, you want to enable
                    the WiFi.
                    The package containing the firmware for the WiFi hardware is always
                    expected to exist, so it is acceptable for the build process to depend upon
                    finding the package.
                    In this case, assuming the package for the firmware was called
                    <filename>wifidriver-firmware</filename>, you would use the following in the
                    <filename>.conf</filename> file for the machine:
                    <literallayout class='monospaced'>
     MACHINE_EXTRA_RDEPENDS += "wifidriver-firmware"
                    </literallayout>
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-MACHINE_EXTRA_RRECOMMENDS'><glossterm>MACHINE_EXTRA_RRECOMMENDS</glossterm>
            <glossdef>
                <para></para>
                <para>
                    A list of machine-specific packages to install as part of the
                    image being built that are not essential for booting the machine.
                    The image being built has no build dependency on this list of packages.
                </para>
                <para>
                    This variable affects only images based on
                    <filename>packagegroup-base</filename>, which does not include the
                    <filename>core-image-minimal</filename> or <filename>core-image-basic</filename>
                    images.
                </para>
                <para>
                    This variable is similar to the
                    <filename><link linkend='var-MACHINE_EXTRA_RDEPENDS'>MACHINE_EXTRA_RDEPENDS</link></filename>
                    variable with the exception that the image being built does not have a build
                    dependency on the variable's list of packages.
                    In other words, the image will build if a file in this list is not found.
                </para>
                <para>
                    An example is a machine that has WiFi capability but is not essential
                    For the machine to boot the image.
                    However, if you are building a more fully-featured image, you want to enable
                    WiFi.
                    In this case, the package containing the WiFi kernel module will not be produced
                    if the WiFi driver is built into the kernel, in which case you still want the
                    build to succeed instead of failing as a result of the package not being found.
                    To accomplish this, assuming the package for the module was called
                    <filename>kernel-module-examplewifi</filename>, you would use the
                    following in the <filename>.conf</filename> file for the machine:
                    <literallayout class='monospaced'>
     MACHINE_EXTRA_RRECOMMENDS += "kernel-module-examplewifi"
                    </literallayout>
                </para>
            </glossdef>
         </glossentry>

         <glossentry id='var-MACHINE_FEATURES'><glossterm>MACHINE_FEATURES</glossterm>
            <glossdef>
                <para>Specifies the list of hardware features the
                    <link linkend='var-MACHINE'>MACHINE</link> supports.
                    For example, including the "bluetooth" feature causes the
                    <filename>bluez</filename> bluetooth daemon to be built and
                    added to the image.
                    It also causes the <filename>connman</filename> recipe
                    to look at <filename>MACHINE_FEATURES</filename> and when it
                    finds "bluetooth" there it enables the bluetooth
                    support in ConnMan.
                </para>

                <para>
                    For a list of features supported by the Yocto Project as shipped,
                    see the "<link linkend='ref-features-machine'>Machine</link>" section.
                </para>
            </glossdef>
         </glossentry>

        <glossentry id='var-MACHINE_FEATURES_BACKFILL'><glossterm>MACHINE_FEATURES_BACKFILL</glossterm>
            <glossdef>
                <para>Features to be added to
                    <filename><link linkend='var-MACHINE_FEATURES'>MACHINE_FEATURES</link></filename>
                    if not also present in
                    <filename><link linkend='var-MACHINE_FEATURES_BACKFILL_CONSIDERED'>MACHINE_FEATURES_BACKFILL_CONSIDERED</link></filename>.
                </para>

                <para>
                    This variable is set in the <filename>meta/conf/bitbake.conf</filename> file.
                    It is not intended to be user-configurable.
                    It is best to just reference the variable to see which machine features are
                    being backfilled for all machine configurations.
                    See the "<link linkend='ref-features-backfill'>Feature backfilling</link>" section for
                    more information.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MACHINE_FEATURES_BACKFILL_CONSIDERED'><glossterm>MACHINE_FEATURES_BACKFILL_CONSIDERED</glossterm>
            <glossdef>
                <para>Features from
                    <filename><link linkend='var-MACHINE_FEATURES_BACKFILL'>MACHINE_FEATURES_BACKFILL</link></filename>
                    that should not be backfilled (i.e. added to
                    <filename><link linkend='var-MACHINE_FEATURES'>MACHINE_FEATURES</link></filename>)
                    during the build.
                    See the "<link linkend='ref-features-backfill'>Feature backfilling</link>" section for
                    more information.
                    </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MACHINEOVERRIDES'><glossterm>MACHINEOVERRIDES</glossterm>
            <glossdef>
                <para>
                    Lists overrides specific to the current machine.
                    By default, this list includes the value
                    of <filename><link linkend='var-MACHINE'>MACHINE</link></filename>.
                    You can extend the list to apply variable overrides for
                    classes of machines.
                    For example, all QEMU emulated machines (e.g. qemuarm,
                    qemux86, and so forth) include a common file named
                    <filename>meta/conf/machine/include/qemu.inc</filename>
                    that prepends <filename>MACHINEOVERRIDES</filename> with
                    the following variable override:
                    <literallayout class='monospaced'>
    MACHINEOVERRIDES =. "qemuall:"
                    </literallayout>
                    Applying an override like <filename>qemuall</filename>
                    affects all QEMU emulated machines elsewhere.
                    Here is an example from the
                    <filename>connman-conf</filename> recipe:
                    <literallayout class='monospaced'>
    SRC_URI_append_qemuall = "file://wired.config \
                              file://wired-setup \
                             "
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MAINTAINER'><glossterm>MAINTAINER</glossterm>
            <glossdef>
                <para>The email address of the distribution maintainer.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MIRRORS'><glossterm>MIRRORS</glossterm>
            <glossdef>
                <para>
                    Specifies additional paths from which the OpenEmbedded
                    build system gets source code.
                    When the build system searches for source code, it first
                    tries the local download directory.
                    If that location fails, the build system tries locations
                    defined by
                    <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link>,
                    the upstream source, and then locations specified by
                    <filename>MIRRORS</filename> in that order.
                </para>

                <para>
                    Assuming your distribution
                    (<link linkend='var-DISTRO'><filename>DISTRO</filename></link>)
                    is "poky", the default value for
                    <filename>MIRRORS</filename> is defined in the
                    <filename>conf/distro/poky.conf</filename> file in the
                    <filename>meta-yocto</filename> Git repository.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MLPREFIX'><glossterm>MLPREFIX</glossterm>
            <glossdef>
                <para>
                    Specifies a prefix has been added to
                    <link linkend='var-PN'><filename>PN</filename></link> to create a special version
                    of a recipe or package, such as a Multilib version.
                    The variable is used in places where the prefix needs to be
                    added to or removed from a the name (e.g. the
                    <link linkend='var-BPN'><filename>BPN</filename></link> variable).
                    <filename>MLPREFIX</filename> gets set when a prefix has been
                    added to <filename>PN</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MODULE_TARBALL_DEPLOY'><glossterm>MODULE_TARBALL_DEPLOY</glossterm>
            <glossdef>
                <para>
                    Controls creation of the <filename>modules-*.tgz</filename>
                    file.
                    Set this variable to "0" to disable creation of this
                    file, which contains all of the kernel modules resulting
                    from a kernel build.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-MULTIMACH_TARGET_SYS'><glossterm>MULTIMACH_TARGET_SYS</glossterm>
            <glossdef>
                <para>
                    Separates files for different machines such that you can build
                    for multiple target machines using the same output directories.
                    See the <link linkend='var-STAMP'><filename>STAMP</filename></link> variable
                    for an example.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-n'><title>N</title>

        <glossentry id='var-NATIVELSBSTRING'><glossterm>NATIVELSBSTRING</glossterm>
            <glossdef>
                <para>
                    A string identifying the host distribution.
                    Strings consist of the host distributor ID
                    followed by the release, as reported by the
                    <filename>lsb_release</filename> tool
                    or as read from <filename>/etc/lsb-release</filename>.
                    For example, when running a build on Ubuntu 12.10, the value
                    is "Ubuntu-12.10".
                    If this information is unable to be determined, the value
                    resolves to "Unknown".
                </para>
                <para>
                    This variable is used by default to isolate native shared
                    state packages for different distributions (e.g. to avoid
                    problems with <filename>glibc</filename> version
                    incompatibilities).
                    Additionally, the variable is checked against
                    <link linkend='var-SANITY_TESTED_DISTROS'><filename>SANITY_TESTED_DISTROS</filename></link>
                    if that variable is set.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-o'><title>O</title>

        <glossentry id='var-OE_BINCONFIG_EXTRA_MANGLE'><glossterm>OE_BINCONFIG_EXTRA_MANGLE</glossterm>
            <glossdef>
                <para>
                    When a recipe inherits the
                    <filename>binconfig.bbclass</filename> class, this variable
                    specifies additional arguments passed to the "sed" command.
                    The sed command alters any paths in configuration scripts
                    that have been set up during compilation.
                    Inheriting this class results in all paths in these scripts
                    being changed to point into the
                    <filename>sysroots/</filename> directory so that all builds
                    that use the script will use the correct directories
                    for the cross compiling layout.
                </para>

                <para>
                    See the <filename>meta/classes/binconfig.bbclass</filename>
                    in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
                    for details on how this class applies these additional
                    sed command arguments.
                    For general information on the
                    <filename>binconfig.bbclass</filename> class, see the
                    "<link linkend='ref-classes-binconfig'>Binary Configuration Scripts - <filename>binconfig.bbclass</filename></link>"
                    section.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-OE_IMPORTS'><glossterm>OE_IMPORTS</glossterm>
            <glossdef>
                <para>
                    An internal variable used to tell the OpenEmbedded build
                    system what Python modules to import for every Python
                    function run by the system.
                </para>

                <note>
                    Do not set this variable.
                    It is for internal use only.
                </note>
            </glossdef>
        </glossentry>

        <glossentry id='var-OE_TERMINAL'><glossterm>OE_TERMINAL</glossterm>
            <glossdef>
                <para>
                    Controls how the OpenEmbedded build system spawns
                    interactive terminals on the host development system
                    (e.g. using the BitBake command with the
                    <filename>-c devshell</filename> command-line option).
                    For more information, see the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#platdev-appdev-devshell'>Using a Development Shell</ulink>" section
                    in the Yocto Project Development Manual.
                 </para>

                 <para>
                    You can use the following values for the
                    <filename>OE_TERMINAL</filename> variable:
                    <literallayout class='monospaced'>
     auto
     gnome
     xfce
     rxvt
     screen
     konsole
     none
                    </literallayout>
                    <note>Konsole support only works for KDE 3.x.
                        Also, "auto" is the default behavior for
                        <filename>OE_TERMINAL</filename></note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-OLDEST_KERNEL'><glossterm>OLDEST_KERNEL</glossterm>
            <glossdef>
                <para>
                    Declares the oldest version of the Linux kernel that the
                    produced binaries must support.
                    This variable is passed into the build of the Embedded
                    GNU C Library (<filename>eglibc</filename>).
                </para>

                <para>
                    The default for this variable comes from the
                    <filename>meta/conf/bitbake.conf</filename> configuration
                    file.
                    You can override this default by setting the variable
                    in a custom distribution configuration file.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-OVERRIDES'><glossterm>OVERRIDES</glossterm>
            <glossdef>
                <para>
                    BitBake uses <filename>OVERRIDES</filename> to control
                    what variables are overridden after BitBake parses
                    recipes and configuration files.
                    You can find more information on how overrides are handled
                    in the BitBake Manual that is located at
                    <filename>bitbake/doc/manual</filename> in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                </para>
            </glossdef>
        </glossentry>
    </glossdiv>

    <glossdiv id='var-glossary-p'><title>P</title>

        <glossentry id='var-P'><glossterm>P</glossterm>
            <glossdef>
                <para>The recipe name and version.
                    <filename>P</filename> is comprised of the following:
                    <literallayout class='monospaced'>
     ${PN}-${PV}
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGE_ARCH'><glossterm>PACKAGE_ARCH</glossterm>
            <glossdef>
                <para>The architecture of the resulting package or packages.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGE_BEFORE_PN'><glossterm>PACKAGE_BEFORE_PN</glossterm>
            <glossdef>
                <para>Enables easily adding packages to
                <filename><link linkend='var-PACKAGES'>PACKAGES</link></filename>
                before <filename>${<link linkend='var-PN'>PN</link>}</filename>
                so that the packages can pick up files that would normally be
                included in the default package.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGE_CLASSES'><glossterm>PACKAGE_CLASSES</glossterm>
            <glossdef>
                <para>This variable, which is set in the <filename>local.conf</filename> configuration
                    file found in the <filename>conf</filename> folder of the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>,
                    specifies the package manager to use when packaging data.
                    You can provide one or more arguments for the variable with the first
                    argument being the package manager used to create images:
                    <literallayout class='monospaced'>
     PACKAGE_CLASSES ?= "package_rpm package_deb package_ipk"
                    </literallayout>
                    For information on build performance effects as a result of the
                    package manager use, see
                    <link linkend='ref-classes-package'>Packaging - <filename>package*.bbclass</filename></link>
                    in this manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGE_EXTRA_ARCHS'><glossterm>PACKAGE_EXTRA_ARCHS</glossterm>
            <glossdef>
                <para>Specifies the list of architectures compatible with the device CPU.
                    This variable is useful when you build for several different devices that use
                    miscellaneous processors such as XScale and ARM926-EJS).</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGE_INSTALL'><glossterm>PACKAGE_INSTALL</glossterm>
            <glossdef>
                <para>
                    The final list of packages passed to the package manager
                    for installation into the image.
                    Because the package manager controls actual installation
                    of all packages, the list of packages passed using
                    <filename>PACKAGE_INSTALL</filename> is not the final list
                    of packages that are actually installed.
                </para>

                <para>
                    This variable is internal to the image construction
                    code.
                    Use the
                    <link linkend='var-IMAGE_INSTALL'><filename>IMAGE_INSTALL</filename></link>
                    variable to specify packages for installation.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGECONFIG'><glossterm>PACKAGECONFIG</glossterm>
            <glossdef>
                <para>
                    This variable provides a means of enabling or disabling
                    features of a recipe on a per-recipe basis.
                    The <filename>PACKAGECONFIG</filename>
                    variable itself specifies a space-separated list of the
                    features to enable.
                    The features themselves are specified as flags on the
                    <filename>PACKAGECONFIG</filename> variable.
                    You can provide up to four arguments, which are separated by
                    commas, to determine the behavior of each feature
                    when it is enabled or disabled.
                    You can omit any argument you like but must retain the
                    separating commas.
                    The arguments specify the following:
                    <orderedlist>
                        <listitem><para>Extra arguments
                            that should be added to the configure script argument list
                            (<link linkend='var-EXTRA_OECONF'><filename>EXTRA_OECONF</filename></link>)
                            if the feature is enabled.</para></listitem>
                        <listitem><para>Extra arguments
                            that should be added to <filename>EXTRA_OECONF</filename>
                            if the feature is disabled.
                            </para></listitem>
                        <listitem><para>Additional build dependencies
                            (<link linkend='var-DEPENDS'><filename>DEPENDS</filename></link>)
                            that should be added if the feature is enabled.
                            </para></listitem>
                        <listitem><para>Additional runtime dependencies
                            (<link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>)
                            that should be added if the feature is enabled.
                            </para></listitem>
                    </orderedlist>
                </para>

                <para>
                    Consider the following example taken from the
                    <filename>librsvg</filename> recipe.
                    In this example the feature is <filename>croco</filename>, which
                    has three arguments that determine the feature's behavior.
                        <literallayout class='monospaced'>
     PACKAGECONFIG ??= "croco"
     PACKAGECONFIG[croco] = "--with-croco,--without-croco,libcroco"
                        </literallayout>
                    The <filename>--with-croco</filename> and
                    <filename>libcroco</filename> arguments apply only if
                    the feature is enabled.
                    In this case, <filename>--with-croco</filename> is
                    added to the configure script argument list and
                    <filename>libcroco</filename> is added to
                    <filename><link linkend='var-DEPENDS'>DEPENDS</link></filename>.
                    On the other hand, if the feature is disabled say through
                    a <filename>.bbappend</filename> file in another layer, then
                    the second argument <filename>--without-croco</filename> is
                    added to the configure script rather than
                    <filename>--with-croco</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGES'><glossterm>PACKAGES</glossterm>
            <glossdef>
                <para>The list of packages to be created from the recipe.
                    The default value is the following:
                    <literallayout class='monospaced'>
     ${PN}-dbg ${PN}-staticdev ${PN}-dev ${PN}-doc ${PN}-locale ${PACKAGE_BEFORE_PN} ${PN}
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PACKAGES_DYNAMIC'><glossterm>PACKAGES_DYNAMIC</glossterm>
            <glossdef>
                <para>
                    A promise that your recipe satisfies runtime dependencies
                    for optional modules that are found in other recipes.
                    <filename>PACKAGES_DYNAMIC</filename>
                    does not actually satisfy the dependencies, it only states that
                    they should be satisfied.
                    For example, if a hard, runtime dependency
                    (<link linkend='var-RDEPENDS'><filename>RDEPENDS</filename></link>)
                    of another package is satisfied
                    at build time through the <filename>PACKAGES_DYNAMIC</filename>
                    variable, but a package with the module name is never actually
                    produced, then the other package will be broken.
                    Thus, if you attempt to include that package in an image,
                    you will get a dependency failure from the packaging system
                    during <filename>do_rootfs</filename>.
                </para>
                <para>
                    Typically, if there is a chance that such a situation can
                    occur and the package that is not created is valid
                    without the dependency being satisfied, then you should use
                    <link linkend='var-RRECOMMENDS'><filename>RRECOMMENDS</filename></link>
                    (a soft runtime dependency) instead of
                    <filename>RDEPENDS</filename>.
                </para>

                <para>
                    For an example of how to use the <filename>PACKAGES_DYNAMIC</filename>
                    variable when you are splitting packages, see the
                    "<ulink url='&YOCTO_DOCS_DEV_URL;#handling-optional-module-packaging'>Handling Optional Module Packaging</ulink>" section
                    in the Yocto Project Development Manual.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PARALLEL_MAKE'><glossterm>PARALLEL_MAKE</glossterm>
            <glossdef>
                <para>Specifies extra options that are passed to the <filename>make</filename> command during the
                    compile tasks.
                    This variable is usually in the form <filename>-j 4</filename>, where the number
                    represents the maximum number of parallel threads make can run.
                    If you development host supports multiple cores a good rule of thumb is to set
                    this variable to twice the number of cores on the host.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PATCHTOOL'><glossterm>PATCHTOOL</glossterm>
            <glossdef>
                <para>
                    Specifies the utility used to apply patches for a recipe
                    during <filename>do_patch</filename>.
                    The default utility used is "quilt" except for the
                    quilt-native recipe itself.
                    Because the quilt tool is not available at the
                    time quilt-native is being patched, it uses "patch".
                </para>

                <para>
                    If you wish to use an alternative patching tool, set the
                    variable in the recipe:
                    <literallayout class='monospaced'>
     PATCHTOOL = "tool-name"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PF'><glossterm>PF</glossterm>
            <glossdef>
                <para>Specifies the recipe or package name and includes all version and revision
                    numbers (i.e. <filename>eglibc-2.13-r20+svnr15508/</filename> and
                    <filename>bash-4.2-r1/</filename>).
                    This variable is comprised of the following:
                    <literallayout class='monospaced'>
     ${<link linkend='var-PN'>PN</link>}-${<link linkend='var-EXTENDPE'>EXTENDPE</link>}${<link linkend='var-PV'>PV</link>}-${<link linkend='var-PR'>PR</link>}
                    </literallayout></para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PN'><glossterm>PN</glossterm>
            <glossdef>
                <para>This variable can have two separate functions depending on the context: a recipe
                    name or a resulting package name.</para>
                <para><filename>PN</filename> refers to a recipe name in the context of a file used
                    by the OpenEmbedded build system as input to create a package.
                    The name is normally extracted from the recipe file name.
                    For example, if the recipe is named
                    <filename>expat_2.0.1.bb</filename>, then the default value of <filename>PN</filename>
                    will be "expat".</para>
                <para>
                    The variable refers to a package name in the context of a file created or produced by the
                    OpenEmbedded build system.</para>
                <para>If applicable, the <filename>PN</filename> variable also contains any special
                    suffix or prefix.
                    For example, using <filename>bash</filename> to build packages for the native
                    machine, <filename>PN</filename> is <filename>bash-native</filename>.
                    Using <filename>bash</filename> to build packages for the target and for Multilib,
                    <filename>PN</filename> would be <filename>bash</filename> and
                    <filename>lib64-bash</filename>, respectively.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PR'><glossterm>PR</glossterm>
            <glossdef>
                <para>The revision of the recipe.
                    The default value for this variable is "r0".
                    </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PREMIRRORS'><glossterm>PREMIRRORS</glossterm>
            <glossdef>
                <para>
                    Specifies additional paths from which the OpenEmbedded
                    build system gets source code.
                    When the build system searches for source code, it first
                    tries the local download directory.
                    If that location fails, the build system tries locations
                    defined by <filename>PREMIRRORS</filename>, the upstream
                    source, and then locations specified by
                    <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link>
                    in that order.
                </para>

                <para>
                    Assuming your distribution
                    (<link linkend='var-DISTRO'><filename>DISTRO</filename></link>)
                    is "poky", the default value for
                    <filename>PREMIRRORS</filename> is defined in the
                    <filename>conf/distro/poky.conf</filename> file in the
                    <filename>meta-yocto</filename> Git repository.
                </para>

                <para>
                    Typically, you could add a specific server for the
                    build system to attempt before any others by adding
                    something like the following to the
                    <filename>local.conf</filename> configuration file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>:
                    <literallayout class='monospaced'>
     PREMIRRORS_prepend = "\
     git://.*/.* http://www.yoctoproject.org/sources/ \n \
     ftp://.*/.* http://www.yoctoproject.org/sources/ \n \
     http://.*/.* http://www.yoctoproject.org/sources/ \n \
     https://.*/.* http://www.yoctoproject.org/sources/ \n"
                    </literallayout>
                    These changes cause the build system to intercept
                    Git, FTP, HTTP, and HTTPS requests and direct them to
                    the <filename>http://</filename> sources mirror.
                    You can use <filename>file://</filename> URLs to point
                    to local directories or network shares as well.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PRINC'><glossterm>PRINC</glossterm>
            <glossdef>
                <para>Causes the <link linkend='var-PR'><filename>PR</filename></link>
                    variable of <filename>.bbappend</filename> files to
                    dynamically increment.
                    This increment minimizes the impact of layer ordering.</para>
                <para>In order to ensure multiple <filename>.bbappend</filename> files can co-exist,
                    <filename>PRINC</filename> should be self referencing.
                    This variable defaults to 0.</para>
                <para>Following is an example that increments <filename>PR</filename> by two:
                    <literallayout class='monospaced'>
     PRINC := "${@int(PRINC) + 2}"
                    </literallayout>
                    It is advisable not to use strings such as ".= '.1'" with the variable because
                    this usage is very sensitive to layer ordering.
                    You should avoid explicit assignments as they cannot
                    adequately represent multiple
                    <filename>.bbappend</filename> files.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PROVIDES'><glossterm>PROVIDES</glossterm>
            <glossdef>
                <para>
                    A list of aliases that a recipe also provides.
                    These aliases are useful for satisfying dependencies of
                    other recipes during the build (as specified by
                    <filename><link linkend='var-DEPENDS'>DEPENDS</link></filename>).
                    <note>
                        A recipe's own
                        <filename><link linkend='var-PN'>PN</link></filename>
                        is implicitly already in its
                        <filename>PROVIDES</filename> list.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PV'><glossterm>PV</glossterm>
            <glossdef>
                <para>The version of the recipe.
                    The version is normally extracted from the recipe filename.
                    For example, if the recipe is named
                    <filename>expat_2.0.1.bb</filename>, then the default value of <filename>PV</filename>
                    will be "2.0.1".
                    <filename>PV</filename> is generally not overridden within
                    a recipe unless it is building an unstable (i.e. development) version from a source code repository
                    (e.g. Git or Subversion).
                 </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PE'><glossterm>PE</glossterm>
            <glossdef>
                <para>
                    the epoch of the recipe.
                    The default value is "0".
                    The field is used to make upgrades possible when the versioning scheme changes in
                    some backwards incompatible way.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PREFERRED_PROVIDER'><glossterm>PREFERRED_PROVIDER</glossterm>
            <glossdef>
                <para>
                    If multiple recipes provide an item, this variable
                    determines which recipe should be given preference.
                    You should always suffix the variable with the name of the
                    provided item, and you should set it to the
                    <link linkend='var-PN'><filename>PN</filename></link>
                    of the recipe to which you want to give precedence.
                    Here is an example:
                    <literallayout class='monospaced'>
     PREFERRED_PROVIDER_virtual/xserver = "xserver-xf86"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-PREFERRED_VERSION'><glossterm>PREFERRED_VERSION</glossterm>
            <glossdef>
                <para>
                    If there are multiple versions of recipes available, this
                    variable determines which recipe should be given preference.
                    You must always suffix the variable with the
                    <link linkend='var-PN'><filename>PN</filename></link>
                    you want to select, and you should set to the
                    <link linkend='var-PV'><filename>PV</filename></link>
                    accordingly for precedence.
                    You can use the "<filename>%</filename>" character as a
                    wildcard to match any number of characters, which can be
                    useful when specifying versions that contain long revision
                    numbers that could potentially change.
                    Here are two examples:
                    <literallayout class='monospaced'>
     PREFERRED_VERSION_python = "2.6.6"
     PREFERRED_VERSION_linux-yocto = "3.0+git%"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

<!--            <glossdiv id='var-glossary-q'><title>Q</title>-->
<!--            </glossdiv>-->

    <glossdiv id='var-glossary-r'><title>R</title>

        <glossentry id='var-RCONFLICTS'><glossterm>RCONFLICTS</glossterm>
            <glossdef>
                <para>The list of packages that conflict with another package.
                    Note that the package will not be installed if the conflicting packages are not
                    first removed.</para>
                <para>
                   Like all package-controlling variables, you must always use them in
                   conjunction with a package name override.
                   Here is an example:
                   <literallayout class='monospaced'>
     RCONFLICTS_${PN} = "another-conflicting-package-name"
                   </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RDEPENDS'><glossterm>RDEPENDS</glossterm>
            <glossdef>
                <para>
                    Lists a package's run-time dependencies (i.e. other packages)
                    that must be installed in order for the built package to run
                    correctly.
                    If a package in this list cannot be found during the build,
                    you will get a build error.
                </para>

                <para>
                    The names of the packages you list within
                    <filename>RDEPENDS</filename> must be the names of other
                    packages - they cannot be recipe names.
                    Although package names and recipe names usually match,
                    the important point here is that you are
                    providing package names within the
                    <filename>RDEPENDS</filename> variable.
                    For an example of the default list of packages created from
                    a recipe, see the
                    <link linkend='var-PACKAGES'><filename>PACKAGES</filename></link>
                    variable.
                </para>

                <para>
                    Because the <filename>RDEPENDS</filename> variable applies
                    to packages being built, you should always use the variable
                    in a form with an attached package name.
                    For example, suppose you are building a development package
                    that depends on the <filename>perl</filename> package.
                    In this case, you would use the following
                    <filename>RDEPENDS</filename> statement:
                    <literallayout class='monospaced'>
     RDEPENDS_${PN}-dev += "perl"
                    </literallayout>
                    In the example, the development package depends on
                    the <filename>perl</filename> package.
                    Thus, the <filename>RDEPENDS</filename> variable has the
                    <filename>${PN}-dev</filename> package name as part of the
                    variable.
                </para>

                <para>
                    The package name you attach to the
                    <filename>RDEPENDS</filename> variable must appear
                    as it would in the <filename>PACKAGES</filename>
                    namespace before any renaming of the output package by
                    classes like <filename>debian.bbclass</filename>.
                </para>

                <para>
                    In many cases you do not need to explicitly add
                    run-time dependencies using
                    <filename>RDEPENDS</filename> since some automatic
                    handling occurs:
                    <itemizedlist>
                        <listitem><para><emphasis><filename>shlibdeps</filename></emphasis>:  If
                            a run-time package contains a shared library
                            (<filename>.so</filename>), the build
                            processes the library in order to determine other
                            libraries to which it is dynamically linked.
                            The build process adds these libraries to
                            <filename>RDEPENDS</filename> when creating the run-time
                            package.</para></listitem>
                        <listitem><para><emphasis><filename>pcdeps</filename></emphasis>:  If
                            the package ships a <filename>pkg-config</filename>
                            information file, the build process uses this file
                            to add items to the <filename>RDEPENDS</filename>
                            variable to create the run-time packages.
                            </para></listitem>
                    </itemizedlist>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RM_OLD_IMAGE'><glossterm>RM_OLD_IMAGE</glossterm>
            <glossdef>
                <para>
                    Reclaims disk space by removing previously built
                    versions of the same image from the
                    <filename>images</filename> directory pointed to by the
                    <link linkend='var-DEPLOY_DIR'><filename>DEPLOY_DIR</filename></link>
                    variable.
                </para>

                <para>
                    Set this variable to "1" in your
                    <filename>local.conf</filename> file to remove these
                    images.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RM_WORK_EXCLUDE'><glossterm>RM_WORK_EXCLUDE</glossterm>
            <glossdef>
                <para>
                    With <filename>rm_work</filename> enabled, this
                    variable specifies a list of recipes whose work directories
                    should not be removed.
                    See the "<link linkend='ref-classes-rm-work'>Removing Work Files During the Build - <filename>rm_work.bbclass</filename></link>"
                    section for more details.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RPROVIDES'><glossterm>RPROVIDES</glossterm>
            <glossdef>
                <para>
                    A list of package name aliases that a package also provides.
                    These aliases are useful for satisfying runtime dependencies
                    of other packages both during the build and on the target
                    (as specified by
                    <filename><link linkend='var-RDEPENDS'>RDEPENDS</link></filename>).
                    <note>
                        A package's own name is implicitly already in its
                        <filename>RPROVIDES</filename> list.
                    </note>
                </para>
                <para>
                   As with all package-controlling variables, you must always
                   use the variable in conjunction with a package name override.
                   Here is an example:
                   <literallayout class='monospaced'>
     RPROVIDES_${PN} = "widget-abi-2"
                   </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RRECOMMENDS'><glossterm>RRECOMMENDS</glossterm>
            <glossdef>
                <para>
                    A list of packages that extends the usability of a package being
                    built.
                    The package being built does not depend on this list of packages in
                    order to successfully build, but needs them for the extended usability.
                    To specify runtime dependencies for packages, see the
                    <filename><link linkend='var-RDEPENDS'>RDEPENDS</link></filename> variable.
                </para>
                <para>
                    The OpenEmbedded build process automatically installs the list of packages
                    as part of the built package.
                    However, you can remove them later if you want.
                    If, during the build, a package from the list cannot be found, the build
                    process continues without an error.
                </para>
                <para>
                    Because the <filename>RRECOMMENDS</filename> variable applies to packages
                    being built, you should
                    always attach an override to the variable to specify the particular package
                    whose usability is being extended.
                    For example, suppose you are building a development package that is extended
                    to support wireless functionality.
                    In this case, you would use the following:
                    <literallayout class='monospaced'>
     RRECOMMENDS_${PN}-dev += "&lt;wireless_package_name&gt;"
                    </literallayout>
                    In the example, the package name
                    (<filename>${<link linkend='var-PN'>PN</link>}-dev</filename>)
                    must appear as it would in the
                    <filename><link linkend='var-PACKAGES'>PACKAGES</link></filename> namespace before any
                    renaming of the output package by classes like <filename>debian.bbclass</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RREPLACES'><glossterm>RREPLACES</glossterm>
            <glossdef>
                <para>
                    A list of packages replaced by a package.
                    The package manager uses this variable to determine which
                    package should be installed to replace other package(s)
                    during an upgrade.
                    In order to also have the other package(s) removed at the
                    same time, you must add the name of the other
                    package to the
                    <filename><link linkend='var-RCONFLICTS'>RCONFLICTS</link></filename> variable.
                </para>
                <para>
                   As with all package-controlling variables, you must use
                   this variable in conjunction with a package name
                   override.
                   Here is an example:
                   <literallayout class='monospaced'>
     RREPLACES_${PN} = "other-package-being-replaced"
                   </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-RSUGGESTS'><glossterm>RSUGGESTS</glossterm>
            <glossdef>
                <para>
                    A list of additional packages that you can suggest for
                    installation by the package manager at the time a package
                    is installed.
                    Not all package managers support this functionality.
                </para>
                <para>
                   As with all package-controlling variables, you must always
                   use this variable in conjunction with a package name
                   override.
                   Here is an example:
                   <literallayout class='monospaced'>
     RSUGGESTS_${PN} = "useful-package another-package"
                   </literallayout>
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-s'><title>S</title>

        <glossentry id='var-S'><glossterm>S</glossterm>
            <glossdef>
                <para>
                    The location in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
                    where unpacked recipe source code resides.
                    This location is within the working directory
                    (<filename><link linkend='var-WORKDIR'>WORKDIR</link></filename>),
                    which is not static.
                    The unpacked source location depends on the recipe name
                    (<filename><link linkend='var-PN'>PN</link></filename>) and
                    recipe version
                    (<filename><link linkend='var-PV'>PV</link></filename>) as
                    follows:
                    <literallayout class='monospaced'>
 ${WORKDIR}/${PN}/${PV}
                    </literallayout>
                    As an example, assume a
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
                    top-level folder named <filename>poky</filename> and a
                    default Build Directory at <filename>poky/build</filename>.
                    In this case, the working directory the build system uses
                    to keep the unpacked recipe for <filename>db</filename>
                    is the following:
                    <literallayout class='monospaced'>
 ~/poky/build/tmp/work/qemux86-poky-linux/db/5.1.19-r3/db-5.1.19
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SANITY_TESTED_DISTROS'><glossterm>SANITY_TESTED_DISTROS</glossterm>
            <glossdef>
                <para>
                    A list of the host distribution identifiers that the
                    build system has been tested against.
                    Identifiers consist of the host distributor ID
                    followed by the release,
                    as reported by the <filename>lsb_release</filename> tool
                    or as read from <filename>/etc/lsb-release</filename>.
                    Separate the list items with explicit newline
                    characters (<filename>\n</filename>).
                    If <filename>SANITY_TESTED_DISTROS</filename> is not empty
                    and the current value of
                    <link linkend='var-NATIVELSBSTRING'><filename>NATIVELSBSTRING</filename></link>
                    does not appear in the list, then the build system reports
                    a warning that indicates the current host distribution has
                    not been tested as a build host.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SDKIMAGE_FEATURES'><glossterm>SDKIMAGE_FEATURES</glossterm>
            <glossdef>
                <para>Equivalent to
                    <filename><link linkend='var-IMAGE_FEATURES'>IMAGE_FEATURES</link></filename>.
                    However, this variable applies to the SDK generated from an
                    image using the following command:
                    <literallayout class='monospaced'>
     $ bitbake -c populate_sdk imagename
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SDKMACHINE'><glossterm>SDKMACHINE</glossterm>
            <glossdef>
                <para>
                    The architecture of the machine that runs Application
                    Development Toolkit (ADT) items.
                    In other words, packages are built so that they will run
                    on the target you specify with the argument.
                    This implies that you can build out ADT/SDK items that
                    run on an architecture other than that of your build host.
                    For example, you can use an x86_64-based build host to
                    create packages that will run on an i686-based
                    SDK Machine.
                </para>

                <para>
                    You can use "i686" and "x86_64" as possible values for this
                    variable.
                    The variable defaults to "i686" and is set in the
                    <filename>local.conf</filename> file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    <literallayout class='monospaced'>
     SDKMACHINE ?= "i686"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SECTION'><glossterm>SECTION</glossterm>
            <glossdef>
                <para>The section in which packages should be categorized.
                    Package management utilities can make use of this variable.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SELECTED_OPTIMIZATION'><glossterm>SELECTED_OPTIMIZATION</glossterm>
            <glossdef>
                <para>
                    The variable takes the value of
                    <filename><link linkend='var-FULL_OPTIMIZATION'>FULL_OPTIMIZATION</link></filename>
                    unless <filename><link linkend='var-DEBUG_BUILD'>DEBUG_BUILD</link></filename> = "1".
                    In this case the value of
                    <filename><link linkend='var-DEBUG_OPTIMIZATION'>DEBUG_OPTIMIZATION</link></filename> is used.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SERIAL_CONSOLE'><glossterm>SERIAL_CONSOLE</glossterm>
            <glossdef>
                <para>
                    Defines a serial console (TTY) to enable using getty.
                    Provide a value that specifies the baud rate followed by
                    the TTY device name separated by a space.
                    You cannot specify more than one TTY device:
                    <literallayout class='monospaced'>
     SERIAL_CONSOLE = "115200 ttyS0"
                    </literallayout>
                    <note>
                        The <filename>SERIAL_CONSOLE</filename> is deprecated.
                        Please use the
                        <link linkend='var-SERIAL_CONSOLES'><filename>SERIAL_CONSOLES</filename></link>
                        variable.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SERIAL_CONSOLES'><glossterm>SERIAL_CONSOLES</glossterm>
            <glossdef>
                <para>
                    Defines the serial consoles (TTYs) to enable using getty.
                    Provide a value that specifies the baud rate followed by
                    the TTY device name separated by a semicolon.
                    Use spaces to separate multiple devices:
                    <literallayout class='monospaced'>
     SERIAL_CONSOLES = "115200;ttyS0 115200;ttyS1"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SERIAL_CONSOLES_CHECK'><glossterm>SERIAL_CONSOLES_CHECK</glossterm>
            <glossdef>
                <para>
                    Similar to
                    <link linkend='var-SERIAL_CONSOLES'><filename>SERIAL_CONSOLES</filename></link>
                    except the device is checked for existence before attempting
                    to enable it.
                    This variable is currently only supported with SysVinit
                    (i.e. not with systemd).
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SIGGEN_EXCLUDERECIPES_ABISAFE'><glossterm>SIGGEN_EXCLUDERECIPES_ABISAFE</glossterm>
            <glossdef>
                <para>
                    A list of recipes that are completely stable and will
                    never change.
                    The ABI for the recipes in the list are presented by
                    output from the tasks run to build the recipe.
                    Use of this variable is one way to remove dependencies from
                    one recipe on another that affect task signatures and
                    thus force rebuilds when the recipe changes.
                    <caution>
                        If you add an inappropriate variable to this list,
                        the software might break at runtime if the
                        interface of the recipe was changed after the other
                        had been built.
                    </caution>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS'><glossterm>SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS</glossterm>
            <glossdef>
                <para>
                    A list of recipe dependencies that should not be used to
                    determine signatures of tasks from one recipe when they
                    depend on tasks from another recipe.
                    For example:
                    <literallayout class='monospaced'>
    SIGGEN_EXCLUDE_SAFE_RECIPE_DEPS += "intone->mplayer2"
                    </literallayout>
                    In this example, <filename>intone</filename> depends on
                    <filename>mplayer2</filename>.
                </para>

                <para>
                    Use of this variable is one mechanism to remove dependencies
                    that affect task signatures and thus force rebuilds when a
                    recipe changes.
                    <caution>
                        If you add an inappropriate dependency for a recipe
                        relationship, the software might break during
                        runtime if the interface of the second recipe was
                        changed after the first recipe had been built.
                    </caution>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SITEINFO_ENDIANNESS'><glossterm>SITEINFO_ENDIANNESS</glossterm>
            <glossdef>
                <para>
                    Specifies the endian byte order of the target system.
                    The value should be either "le" for little-endian or "be" for big-endian.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SITEINFO_BITS'><glossterm>SITEINFO_BITS</glossterm>
            <glossdef>
                <para>
                    Specifies the number of bits for the target system CPU.
                    The value should be either "32" or "64".
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SOC_FAMILY'><glossterm>SOC_FAMILY</glossterm>
            <glossdef>
                <para>
                    Groups together machines based upon the same family
                    of SOC (System On Chip).
                    You typically set this variable in a common
                    <filename>.inc</filename> file that you include in the
                    configuration files of all the machines.
                    <note>
                        You must include
                        <filename>conf/machine/include/soc-family.inc</filename>
                        for this variable to appear in
                    <link linkend='var-MACHINEOVERRIDES'><filename>MACHINEOVERRIDES</filename></link>.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SOLIBS'><glossterm>SOLIBS</glossterm>
            <glossdef>
                <para>
                    Defines the suffix for shared libraries used on the
                    target platform.
                    By default, this suffix is ".so.*" for all Linux-based
                    systems and is defined in the
                    <filename>meta/conf/bitbake.conf</filename> configuration
                    file.
                </para>

                <para>
                    You will see this variable referenced in the default values
                    of <filename>FILES_${PN}</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SOLIBSDEV'><glossterm>SOLIBSDEV</glossterm>
            <glossdef>
                <para>
                    Defines the suffix for the development symbolic link
                    (symlink) for shared libraries on the target platform.
                    By default, this suffix is ".so" for Linux-based
                    systems and is defined in the
                    <filename>meta/conf/bitbake.conf</filename> configuration
                    file.
                </para>

                <para>
                    You will see this variable referenced in the default values
                    of <filename>FILES_${PN}-dev</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SPECIAL_PKGSUFFIX'><glossterm>SPECIAL_PKGSUFFIX</glossterm>
            <glossdef>
                <para>
                    A list of prefixes for <link linkend='var-PN'><filename>PN</filename></link> used by the
                    OpenEmbedded build system to create variants of recipes or packages.
                    The list specifies the prefixes to strip off during certain circumstances
                    such as the generation of the <link linkend='var-BPN'><filename>BPN</filename></link> variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SRC_URI'><glossterm>SRC_URI</glossterm>
            <glossdef>
                <para>The list of source files - local or remote.
                    This variable tells the OpenEmbedded build system which bits
                    to pull in for the build and how to pull them in.
                    For example, if the recipe or append file only needs to
                    fetch a tarball from the Internet, the recipe or
                    append file uses a single <filename>SRC_URI</filename>
                    entry.
                    On the other hand, if the recipe or append file needs to
                    fetch a tarball, apply two patches, and include a custom
                    file, the recipe or append file would include four
                    instances of the variable.</para>
                <para>The following list explains the available URI protocols:
                    <itemizedlist>
                        <listitem><para><emphasis><filename>file://</filename> -</emphasis>
                            Fetches files, which are usually files shipped with
                            the
                            <ulink url='&YOCTO_DOCS_DEV_URL;#metadata'>Metadata</ulink>,
                            from the local machine.
                            The path is relative to the
                            <link linkend='var-FILESPATH'><filename>FILESPATH</filename></link>
                            variable.
                            Thus, the build system searches, in order, from the
                            following directories, which are assumed to be a
                            subdirectories of the directory in which the
                            recipe file (<filename>.bb</filename>) or
                            append file (<filename>.bbappend</filename>)
                            resides:
                            <itemizedlist>
                                <listitem><para><emphasis><filename>${BPN}</filename> -</emphasis>
                                    The base recipe name without any special
                                    suffix or version numbers.
                                    </para></listitem>
                                <listitem><para><emphasis><filename>${BP}</filename> -</emphasis>
                                    <filename>${<link linkend='var-BPN'>BPN</link>}-${PV}</filename>.
                                    The base recipe name and version but without
                                    any special package name suffix.
                                    </para></listitem>
                                <listitem><para><emphasis>files -</emphasis>
                                    Files within a directory, which is named
                                    <filename>files</filename> and is also
                                    alongside the recipe or append file.
                                    </para></listitem>
                            </itemizedlist>
                            <note>
                                If you want the build system to pick up files
                                specified through a
                                <filename>SRC_URI</filename>
                                statement from your append file, you need to be
                                sure to extend the
                                <filename>FILESPATH</filename>
                                variable by also using the
                                <link linkend='var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></link>
                                variable from within your append file.
                            </note>
                            </para></listitem>
                        <listitem><para><emphasis><filename>bzr://</filename> -</emphasis> Fetches files from a
                            Bazaar revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>git://</filename> -</emphasis> Fetches files from a
                            Git revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>osc://</filename> -</emphasis> Fetches files from
                            an OSC (OpenSUSE Build service) revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>repo://</filename> -</emphasis> Fetches files from
                            a repo (Git) repository.</para></listitem>
                        <listitem><para><emphasis><filename>svk://</filename> -</emphasis> Fetches files from
                            an SVK revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>http://</filename> -</emphasis> Fetches files from
                            the Internet using <filename>http</filename>.</para></listitem>
                        <listitem><para><emphasis><filename>https://</filename> -</emphasis> Fetches files
                            from the Internet using <filename>https</filename>.</para></listitem>
                        <listitem><para><emphasis><filename>ftp://</filename> -</emphasis> Fetches files
                            from the Internet using <filename>ftp</filename>.</para></listitem>
                        <listitem><para><emphasis><filename>cvs://</filename> -</emphasis> Fetches files from
                            a CVS revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>hg://</filename> -</emphasis> Fetches files from
                            a Mercurial (<filename>hg</filename>) revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>p4://</filename> -</emphasis> Fetches files from
                            a Perforce (<filename>p4</filename>) revision control repository.</para></listitem>
                        <listitem><para><emphasis><filename>ssh://</filename> -</emphasis> Fetches files from
                            a secure shell.</para></listitem>
                        <listitem><para><emphasis><filename>svn://</filename> -</emphasis> Fetches files from
                            a Subversion (<filename>svn</filename>) revision control repository.</para></listitem>
                    </itemizedlist>
                </para>
                <para>Standard and recipe-specific options for <filename>SRC_URI</filename> exist.
                    Here are standard options:
                    <itemizedlist>
                        <listitem><para><emphasis><filename>apply</filename> -</emphasis> Whether to apply
                            the patch or not.
                            The default action is to apply the patch.</para></listitem>
                        <listitem><para><emphasis><filename>striplevel</filename> -</emphasis> Which
                            striplevel to use when applying the patch.
                            The default level is 1.</para></listitem>
                    </itemizedlist>
                </para>
                <para>Here are options specific to recipes building code from a revision control system:
                    <itemizedlist>
                        <listitem><para><emphasis><filename>mindate</filename> -</emphasis>
                            Apply the patch only if
                            <link linkend='var-SRCDATE'><filename>SRCDATE</filename></link>
                            is equal to or greater than <filename>mindate</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>maxdate</filename> -</emphasis>
                            Apply the patch only if <filename>SRCDATE</filename>
                            is not later than <filename>mindate</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>minrev</filename> -</emphasis>
                            Apply the patch only if <filename>SRCREV</filename>
                            is equal to or greater than <filename>minrev</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>maxrev</filename> -</emphasis>
                            Apply the patch only if <filename>SRCREV</filename>
                            is not later than <filename>maxrev</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>rev</filename> -</emphasis>
                            Apply the patch only if <filename>SRCREV</filename>
                            is equal to <filename>rev</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>notrev</filename> -</emphasis>
                            Apply the patch only if <filename>SRCREV</filename>
                            is not equal to <filename>rev</filename>.
                            </para></listitem>
                    </itemizedlist>
                </para>
                <para>Here are some additional options worth mentioning:
                    <itemizedlist>
                        <listitem><para><emphasis><filename>unpack</filename> -</emphasis> Controls
                            whether or not to unpack the file if it is an archive.
                            The default action is to unpack the file.</para></listitem>
                        <listitem><para><emphasis><filename>subdir</filename> -</emphasis> Places the file
                            (or extracts its contents) into the specified
                            subdirectory of <link linkend='var-WORKDIR'><filename>WORKDIR</filename></link>.
                            This option is useful for unusual tarballs or other archives that
                            do not have their files already in a subdirectory within the archive.
                            </para></listitem>
                        <listitem><para><emphasis><filename>name</filename> -</emphasis> Specifies a
                            name to be used for association with <filename>SRC_URI</filename> checksums
                            when you have more than one file specified in <filename>SRC_URI</filename>.
                            </para></listitem>
                        <listitem><para><emphasis><filename>downloadfilename</filename> -</emphasis> Specifies
                            the filename used when storing the downloaded file.</para></listitem>
                    </itemizedlist>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SRC_URI_OVERRIDES_PACKAGE_ARCH'><glossterm>SRC_URI_OVERRIDES_PACKAGE_ARCH</glossterm>
            <glossdef>
                <para></para>
                <para>
                    By default, the OpenEmbedded build system automatically detects whether
                    <filename><link linkend='var-SRC_URI'>SRC_URI</link></filename>
                    contains files that are machine-specific.
                    If so, the build system automatically changes
                    <filename><link linkend='var-PACKAGE_ARCH'>PACKAGE_ARCH</link></filename>.
                    Setting this variable to "0" disables this behavior.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SRCDATE'><glossterm>SRCDATE</glossterm>
            <glossdef>
                <para>
                    The date of the source code used to build the package.
                    This variable applies only if the source was fetched from a Source Code Manager (SCM).
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SRCPV'><glossterm>SRCPV</glossterm>
            <glossdef>
                <para>
                    Returns the version string of the current package.
                    This string is used to help define the value of
                    <link linkend='var-PV'><filename>PV</filename></link>.
                </para>

                <para>
                    The <filename>SRCPV</filename> variable is defined in the
                    <filename>meta/conf/bitbake.conf</filename> configuration
                    file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>
                    as follows:
                    <literallayout class='monospaced'>
     SRCPV = "${@bb.fetch2.get_srcrev(d)}"
                    </literallayout>
                </para>

                <para>
                    Recipes that need to define <filename>PV</filename> do so
                    with the help of the <filename>SRCPV</filename>.
                    For example, the <filename>ofono</filename> recipe
                    (<filename>ofono_git.bb</filename>) located in
                    <filename>meta/recipes-connectivity</filename> in the
                    Source Directory defines <filename>PV</filename> as
                    follows:
                    <literallayout class='monospaced'>
     PV = "1.5.0+git${SRCPV}"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SRCREV'><glossterm>SRCREV</glossterm>
            <glossdef>
                <para>
                    The revision of the source code used to build the package.
                    This variable applies to Subversion, Git, Mercurial and Bazaar
                    only.
                    Note that if you wish to build a fixed revision and you wish
                    to avoid performing a query on the remote repository every time
                    BitBake parses your recipe, you should specify a <filename>SRCREV</filename> that is a
                    full revision identifier and not just a tag.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SSTATE_DIR'><glossterm>SSTATE_DIR</glossterm>
            <glossdef>
                <para>The directory for the shared state cache.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SSTATE_MIRRORS'><glossterm>SSTATE_MIRRORS</glossterm>
            <glossdef>
                <para>
                    Configures the OpenEmbedded build system to search other
                    mirror locations for prebuilt cache data objects before
                    building out the data.
                    This variable works like fetcher
                    <link linkend='var-MIRRORS'><filename>MIRRORS</filename></link>
                    and <link linkend='var-PREMIRRORS'><filename>PREMIRRORS</filename></link>
                    and points to the cache locations to check for the shared
                    objects.
                </para>

                <para>
                    You can specify a filesystem directory or a remote URL such
                    as HTTP or FTP.
                    The locations you specify need to contain the shared state
                    cache (sstate-cache) results from previous builds.
                    The sstate-cache you point to can also be from builds on
                    other machines.
                </para>

                <para>
                    If a mirror uses the same structure as
                    <link linkend='var-SSTATE_DIR'><filename>SSTATE_DIR</filename></link>,
                    you need to add
                    "PATH" at the end as shown in the examples below.
                    The build system substitutes the correct path within the
                    directory structure.
                    <literallayout class='monospaced'>
     SSTATE_MIRRORS ?= "\
     file://.* http://someserver.tld/share/sstate/PATH \n \
     file://.* file:///some/local/dir/sstate/PATH"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-STAGING_KERNEL_DIR'><glossterm>STAGING_KERNEL_DIR</glossterm>
            <glossdef>
                <para>
                    The directory with kernel headers that are required to build out-of-tree
                    modules.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-STAMP'><glossterm>STAMP</glossterm>
            <glossdef>
                <para>
                    Specifies the base path used to create recipe stamp files.
                    The path to an actual stamp file is constructed by evaluating this
                    string and then appending additional information.
                    Currently, the default assignment for <filename>STAMP</filename>
                    as set in the <filename>meta/conf/bitbake.conf</filename> file
                    is:
                    <literallayout class='monospaced'>
     STAMP = "${STAMPS_DIR}/${MULTIMACH_TARGET_SYS}/${PN}/${EXTENDPE}${PV}-${PR}"
                    </literallayout>
                    See <link linkend='var-STAMPS_DIR'><filename>STAMPS_DIR</filename></link>,
                    <link linkend='var-MULTIMACH_TARGET_SYS'><filename>MULTIMACH_TARGET_SYS</filename></link>,
                    <link linkend='var-PN'><filename>PN</filename></link>,
                    <link linkend='var-EXTENDPE'><filename>EXTENDPE</filename></link>,
                    <link linkend='var-PV'><filename>PV</filename></link>, and
                    <link linkend='var-PR'><filename>PR</filename></link> for related variable
                    information.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-STAMPS_DIR'><glossterm>STAMPS_DIR</glossterm>
            <glossdef>
                <para>
                    Specifies the base directory in which the OpenEmbedded
                    build system places stamps.
                    The default directory is
                    <filename>${TMPDIR}/stamps</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SUMMARY'><glossterm>SUMMARY</glossterm>
            <glossdef>
                <para>The short (72 characters or less) summary of the binary package for packaging
                    systems such as <filename>opkg</filename>, <filename>rpm</filename> or
                    <filename>dpkg</filename>.
                    By default, <filename>SUMMARY</filename> is used to define
                    the <link linkend='var-DESCRIPTION'><filename>DESCRIPTION</filename></link>
                    variable if <filename>DESCRIPTION</filename> is not set
                    in the recipe.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-SYSROOT_PREPROCESS_FUNCS'><glossterm>SYSROOT_PREPROCESS_FUNCS</glossterm>
            <glossdef>
                <para>
                    A list of functions to execute after files are staged into
                    the sysroot.
                    These functions are usually used to apply additional
                    processing on the staged files, or to stage additional
                    files.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

    <glossdiv id='var-glossary-t'><title>T</title>

        <glossentry id='var-T'><glossterm>T</glossterm>
            <glossdef>
                <para>This variable points to a directory were BitBake places
                    temporary files, which consist mostly of task logs and
                    scripts, when building a particular recipe.
                    The variable is typically set as follows:
                    <literallayout class='monospaced'>
     T = "${WORKDIR}/temp"
                    </literallayout>
                    The <link linkend='var-WORKDIR'><filename>WORKDIR</filename></link>
                    is the directory into which BitBake unpacks and builds the
                    recipe.
                    The default <filename>bitbake.conf</filename> file sets this variable.</para>
                    <para>The <filename>T</filename> variable is not to be confused with
                    the <link linkend='var-TMPDIR'><filename>TMPDIR</filename></link> variable,
                    which points to the root of the directory tree where BitBake
                    places the output of an entire build.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TARGET_ARCH'><glossterm>TARGET_ARCH</glossterm>
            <glossdef>
                <para>
                    The architecture of the device being built.
                    The OpenEmbedded build system supports the following
                    architectures:
                    <literallayout class='monospaced'>
     arm
     mips
     ppc
     x86
     x86-64
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TARGET_CFLAGS'><glossterm>TARGET_CFLAGS</glossterm>
            <glossdef>
                <para>
                    Flags passed to the C compiler for the target system.
                    This variable evaluates to the same as
                    <filename><link linkend='var-CFLAGS'>CFLAGS</link></filename>.
                </para>
            </glossdef>
        </glossentry>


        <glossentry id='var-TARGET_FPU'><glossterm>TARGET_FPU</glossterm>
            <glossdef>
                <para>Specifies the method for handling FPU code.
                    For FPU-less targets, which include most ARM CPUs, the variable must be
                    set to "soft".
                    If not, the kernel emulation gets used, which results in a performance penalty.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TARGET_OS'><glossterm>TARGET_OS</glossterm>
            <glossdef>
                <para>Specifies the target's operating system.
                    The variable can be set to "linux" for <filename>eglibc</filename>-based systems and
                    to "linux-uclibc" for <filename>uclibc</filename>.
                    For ARM/EABI targets, there are also "linux-gnueabi" and
                    "linux-uclibc-gnueabi" values possible.</para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TCLIBC'><glossterm>TCLIBC</glossterm>
            <glossdef>
                <para>
                    Specifies which variant of the GNU standard C library (<filename>libc</filename>)
                    to use during the build process.
                    This variable replaces <filename>POKYLIBC</filename>, which is no longer
                    supported.
                </para>
                <para>
                    You can select <filename>eglibc</filename> or <filename>uclibc</filename>.
                    <note>
                        This release of the Yocto Project does not support the
                        <filename>glibc</filename> implementation of <filename>libc</filename>.
                    </note>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TCMODE'><glossterm>TCMODE</glossterm>
            <glossdef>
                <para>
                    The toolchain selector.
                    This variable replaces <filename>POKYMODE</filename>, which is no longer
                    supported.
                </para>
                <para>
                    The <filename>TCMODE</filename> variable selects the external toolchain
                    built using the OpenEmbedded build system or a few supported combinations of
                    the upstream GCC or CodeSourcery Labs toolchain.
                    The variable identifies the <filename>tcmode-*</filename> files used in
                    the <filename>meta/conf/distro/include</filename> directory, which is found in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>.
                </para>
                <para>
                    By default, <filename>TCMODE</filename> is set to "default", which
                    chooses the <filename>tcmode-default.inc</filename> file.
                    The variable is similar to
                    <link linkend='var-TCLIBC'><filename>TCLIBC</filename></link>, which controls
                    the variant of the GNU standard C library (<filename>libc</filename>)
                    used during the build process: <filename>eglibc</filename> or <filename>uclibc</filename>.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-THISDIR'><glossterm>THISDIR</glossterm>
            <glossdef>
                <para>
                    The directory in which the file BitBake is currently
                    parsing is located.
                    Do not manually set this variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TMPDIR'><glossterm>TMPDIR</glossterm>
            <glossdef>
                <para>
                    This variable is the base directory the OpenEmbedded
                    build system uses for all build output and intermediate
                    files (other than the shared state cache).
                    By default, the <filename>TMPDIR</filename> variable points
                    to <filename>tmp</filename> within the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                </para>

                <para>
                    If you want to establish this directory in a location other
                    than the default, you can uncomment and edit the following
                    statement in the
                    <filename>conf/local.conf</filename> file in the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink>:
                    <literallayout class='monospaced'>
     #TMPDIR = "${TOPDIR}/tmp"
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TOOLCHAIN_HOST_TASK'><glossterm>TOOLCHAIN_HOST_TASK</glossterm>
            <glossdef>
                <para>
                    This variable lists packages the OpenEmbedded build system
                    uses when building an SDK, which contains a
                    cross-development environment.
                    The packages specified by this variable are part of the
                    toolchain set that runs on the
                    <link linkend='var-SDKMACHINE'><filename>SDKMACHINE</filename></link>,
                    and each package should usually have the prefix
                    "nativesdk-".
                    When building an SDK using
                    <filename>bitbake -c populate_sdk &lt;imagename&gt;</filename>,
                    a default list of packages is set in this variable, but
                    you can add additional packages to the list.
                </para>

                <para>
                    For background information on cross-development toolchains
                    in the Yocto Project development environment, see the
                    "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
                    section.
                    For information on setting up a cross-development
                    environment, see the
                    "<ulink url='&YOCTO_DOCS_ADT_URL;#installing-the-adt'>Installing the ADT and Toolchains</ulink>"
                    section in the Yocto Project Application Developer's Guide.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TOOLCHAIN_TARGET_TASK'><glossterm>TOOLCHAIN_TARGET_TASK</glossterm>
            <glossdef>
                <para>
                    This variable lists packages the OpenEmbedded build system
                    uses when it creates the target part of an SDK
                    (i.e. the part built for the target hardware), which
                    includes libraries and headers.
                </para>

                <para>
                    For background information on cross-development toolchains
                    in the Yocto Project development environment, see the
                    "<link linkend='cross-development-toolchain-generation'>Cross-Development Toolchain Generation</link>"
                    section.
                    For information on setting up a cross-development
                    environment, see the
                    "<ulink url='&YOCTO_DOCS_ADT_URL;#installing-the-adt'>Installing the ADT and Toolchains</ulink>"
                    section in the Yocto Project Application Developer's Guide.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TOPDIR'><glossterm>TOPDIR</glossterm>
            <glossdef>
                <para>
                    This variable points to the
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>.
                    BitBake automatically sets this variable.
                </para>
            </glossdef>
        </glossentry>

        <glossentry id='var-TRANSLATED_TARGET_ARCH'><glossterm>TRANSLATED_TARGET_ARCH</glossterm>
            <glossdef>
                <para>
                    A sanitized version of
                    <link linkend='var-TARGET_ARCH'><filename>TARGET_ARCH</filename></link>.
                    This variable is used where the architecture is needed in
                    a value where underscores are not allowed, for example
                    within package filenames.
                    In this case, dash characters replace any underscore
                    characters used in TARGET_ARCH.
                </para>

                <para>
                    Do not edit this variable.
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

<!--            <glossdiv id='var-glossary-u'><title>U</title>-->
<!--            </glossdiv>-->

<!--            <glossdiv id='var-glossary-v'><title>V</title>-->
<!--            </glossdiv>-->

    <glossdiv id='var-glossary-w'><title>W</title>

        <glossentry id='var-WORKDIR'><glossterm>WORKDIR</glossterm>
            <glossdef>
                <para>
                    The pathname of the working directory in which the OpenEmbedded build system
                    builds a recipe.
                    This directory is located within the
                    <link linkend='var-TMPDIR'><filename>TMPDIR</filename></link> directory structure and changes
                    as different packages are built.
                </para>

                <para>
                    The actual <filename>WORKDIR</filename> directory depends on several things:
                    <itemizedlist>
                        <listitem>The temporary directory - <link linkend='var-TMPDIR'><filename>TMPDIR</filename></link></listitem>
                        <listitem>The package architecture - <link linkend='var-PACKAGE_ARCH'><filename>PACKAGE_ARCH</filename></link></listitem>
                        <listitem>The target machine - <link linkend='var-MACHINE'><filename>MACHINE</filename></link></listitem>
                        <listitem>The target operating system - <link linkend='var-TARGET_OS'><filename>TARGET_OS</filename></link></listitem>
                        <listitem>The recipe name - <link linkend='var-PN'><filename>PN</filename></link></listitem>
                        <listitem>The recipe version - <link linkend='var-PV'><filename>PV</filename></link></listitem>
                        <listitem>The recipe revision - <link linkend='var-PR'><filename>PR</filename></link></listitem>
                    </itemizedlist>
                </para>

                <para>
                    For packages that are not dependent on a particular machine,
                    <filename>WORKDIR</filename> is defined as follows:
                    <literallayout class='monospaced'>
 ${TMPDIR}/work/${PACKAGE_ARCH}-poky-${TARGET_OS}/${PN}/${PV}-${PR}
                    </literallayout>
                    As an example, assume a
                    <ulink url='&YOCTO_DOCS_DEV_URL;#source-directory'>Source Directory</ulink> top-level
                    folder name <filename>poky</filename> and a default
                    <ulink url='&YOCTO_DOCS_DEV_URL;#build-directory'>Build Directory</ulink>
                    at <filename>poky/build</filename>.
                    In this case, the working directory the build system uses to build
                    the <filename>v86d</filename> package is the following:
                    <literallayout class='monospaced'>
     ~/poky/build/tmp/work/qemux86-poky-linux/v86d/01.9-r0
                    </literallayout>
                </para>

                <para>
                    For packages that are dependent on a particular machine, <filename>WORKDIR</filename>
                    is defined slightly different:
                    <literallayout class='monospaced'>
 ${TMPDIR}/work/${MACHINE}-poky-${TARGET_OS}/${PN}/${PV}-${PR}
                    </literallayout>
                    As an example, again assume a Source Directory top-level folder
                    named <filename>poky</filename> and a default Build Directory
                    at <filename>poky/build</filename>.
                    In this case, the working directory the build system uses to build
                    the <filename>acl</filename> recipe, which is being built for a
                    MIPS-based device, is the following:
                    <literallayout class='monospaced'>
     ~/poky/build/tmp/work/mips-poky-linux/acl/2.2.51-r2
                    </literallayout>
                </para>
            </glossdef>
        </glossentry>

    </glossdiv>

<!--            <glossdiv id='var-glossary-x'><title>X</title>-->
<!--            </glossdiv>-->

<!--            <glossdiv id='var-glossary-y'><title>Y</title>-->
<!--            </glossdiv>-->

<!--            <glossdiv id='var-glossary-z'><title>Z</title>-->
<!--            </glossdiv>-->

</glossary>
</chapter>
<!--
vim: expandtab tw=80 ts=4
-->