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authorScott Rifenbark <scott.m.rifenbark@intel.com>2013-04-17 12:51:56 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2013-04-17 22:34:23 +0100
commit6a3f129958efca88b118b9abc0f8eb15c90591e6 (patch)
treeef4c33c28376309635a474b77e780788157c21e6 /documentation/dev-manual/dev-manual-common-tasks.xml
parenta3d2886a472d70e4341c42cbb515539585e5ebce (diff)
downloadpoky-6a3f129958efca88b118b9abc0f8eb15c90591e6.tar.gz
dev-manual: Edits to "Using .bbappend Files"
I re-wrote this to more clearly describe use. (From yocto-docs rev: c3d6eecd38c6d4c8b4e0b4e134cbd53ae3fd2aee) Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Diffstat (limited to 'documentation/dev-manual/dev-manual-common-tasks.xml')
-rw-r--r--documentation/dev-manual/dev-manual-common-tasks.xml52
1 files changed, 35 insertions, 17 deletions
diff --git a/documentation/dev-manual/dev-manual-common-tasks.xml b/documentation/dev-manual/dev-manual-common-tasks.xml
index b263420813..b18d80b41f 100644
--- a/documentation/dev-manual/dev-manual-common-tasks.xml
+++ b/documentation/dev-manual/dev-manual-common-tasks.xml
@@ -395,7 +395,7 @@
395 LICENSE = "MIT" 395 LICENSE = "MIT"
396 LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58 \ 396 LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58 \
397 file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420" 397 file://${COREBASE}/meta/COPYING.MIT;md5=3da9cfbcb788c80a0384361b4de20420"
398 PR = "r20" 398 PR = "r21"
399 399
400 SRC_URI = "file://config file://machconfig" 400 SRC_URI = "file://config file://machconfig"
401 S = "${WORKDIR}" 401 S = "${WORKDIR}"
@@ -410,9 +410,15 @@
410 if [ -s "${S}/machconfig" ]; then 410 if [ -s "${S}/machconfig" ]; then
411 install -m 0644 ${S}/machconfig ${D}${sysconfdir}/formfactor/ 411 install -m 0644 ${S}/machconfig ${D}${sysconfdir}/formfactor/
412 fi 412 fi
413 } 413 } </literallayout>
414 </literallayout> 414 In the main recipe, note the
415 Here is the append file, which is named 415 <ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink>
416 variable, which tells the OpenEmbedded build system where to
417 find files during the build.
418 </para>
419
420 <para>
421 Following is the append file, which is named
416 <filename>formfactor_0.0.bbappend</filename> and is from the 422 <filename>formfactor_0.0.bbappend</filename> and is from the
417 Crown Bay BSP Layer named 423 Crown Bay BSP Layer named
418 <filename>meta-intel/meta-crownbay</filename>. 424 <filename>meta-intel/meta-crownbay</filename>.
@@ -422,21 +428,33 @@
422 428
423 PRINC := "${@int(PRINC) + 2}" 429 PRINC := "${@int(PRINC) + 2}"
424 </literallayout> 430 </literallayout>
425 This example adds or overrides files in 431 </para>
426 <ulink url='&YOCTO_DOCS_REF_URL;#var-SRC_URI'><filename>SRC_URI</filename></ulink> 432
427 within a <filename>.bbappend</filename> by extending the path 433 <para>
428 BitBake uses to search for files. 434 By default, the build system uses the
429 The most reliable way to do this is by prepending the 435 <ulink url='&YOCTO_DOCS_REF_URL;#var-FILESPATH'><filename>FILESPATH</filename></ulink>
436 variable to locate files.
437 This append file extends the locations by setting the
430 <ulink url='&YOCTO_DOCS_REF_URL;#var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></ulink> 438 <ulink url='&YOCTO_DOCS_REF_URL;#var-FILESEXTRAPATHS'><filename>FILESEXTRAPATHS</filename></ulink>
431 variable. 439 variable.
432 For example, if you have your files in a directory that is named 440 Setting this variable in the <filename>.bbappend</filename>
433 the same as your package 441 file is the most reliable and recommended method for adding
434 (<ulink url='&YOCTO_DOCS_REF_URL;#var-PN'><filename>PN</filename></ulink>), 442 directories to the search path used by the build system
435 you can add this directory by adding the following to your 443 to find files.
436 <filename>.bbappend</filename> file: 444 </para>
437 <literallayout class='monospaced'> 445
438 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:" 446 <para>
439 </literallayout> 447 The statement in this example extends the directories to include
448 <filename>${THISDIR}/${</filename><ulink url='&YOCTO_DOCS_REF_URL;#var-PN'><filename>PN</filename></ulink><filename>}</filename>,
449 which resolves to the same directory in which the append file
450 resides (i.e.
451 <filename>meta-intel/meta-crownbay/recipes-bsp/formfactor</filename>.
452 This implies that you must have the supporting directory
453 structure set up that will contain any files or patches you
454 will be including from the layer.
455 </para>
456
457 <para>
440 Using the immediate expansion assignment operator 458 Using the immediate expansion assignment operator
441 <filename>:=</filename> is important because of the reference to 459 <filename>:=</filename> is important because of the reference to
442 <filename>THISDIR</filename>. 460 <filename>THISDIR</filename>.