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-rw-r--r--documentation/ref-manual/usingpoky.xml75
1 files changed, 54 insertions, 21 deletions
diff --git a/documentation/ref-manual/usingpoky.xml b/documentation/ref-manual/usingpoky.xml
index 99912ff14e..f70c1966e1 100644
--- a/documentation/ref-manual/usingpoky.xml
+++ b/documentation/ref-manual/usingpoky.xml
@@ -163,9 +163,8 @@
163 <ulink url='&YOCTO_DOCS_BB_URL;#bitbake-user-manual'>BitBake User Manual</ulink>. 163 <ulink url='&YOCTO_DOCS_BB_URL;#bitbake-user-manual'>BitBake User Manual</ulink>.
164 </note> 164 </note>
165 165
166 166 <section id='usingpoky-debugging-viewing-logs-from-failed-tasks'>
167 <section id='usingpoky-debugging-taskfailures'> 167 <title>Viewing Logs from Failed Tasks</title>
168 <title>Task Failures</title>
169 168
170 <para>The log file for shell tasks is available in 169 <para>The log file for shell tasks is available in
171 <filename>${WORKDIR}/temp/log.do_<replaceable>taskname</replaceable>.pid</filename>. 170 <filename>${WORKDIR}/temp/log.do_<replaceable>taskname</replaceable>.pid</filename>.
@@ -183,6 +182,58 @@
183 </para> 182 </para>
184 </section> 183 </section>
185 184
185 <section id='usingpoky-debugging-viewing-variable-values'>
186 <title>Viewing Variable Values</title>
187 <para>
188 BitBake's <filename>-e</filename> option is used to display
189 variable values after parsing.
190 The following command displays the variable values after the
191 configuration files (i.e. <filename>local.conf</filename>,
192 <filename>bblayers.conf</filename>, and so forth) have been
193 parsed:
194 <literallayout class='monospaced'>
195 $ bitbake -e
196 </literallayout>
197 The following command displays variable values after a specific
198 recipe has been parsed.
199 The variables include those from the configuration as well:
200 <literallayout class='monospaced'>
201 $ bitbake -e recipename
202 </literallayout>
203 <note><para>
204 Each recipe has its own private set of variables (datastore).
205 Internally, after parsing the configuration, a copy of the
206 resulting datastore is made prior to parsing each recipe.
207 This copying implies that variables set in one recipe will
208 not be visible to other recipes.</para>
209
210 <para>Likewise, each task within a recipe gets a private
211 datastore based on the recipe datastore, which means that
212 variables set within one task will not be visible to
213 other tasks.</para>
214 </note>
215 </para>
216
217 <para>
218 In the output of <filename>bitbake -e</filename>, each variable is
219 preceded by a description of how the variable got its value,
220 including temporary values that were later overriden.
221 This description also includes variable flags (varflags) set on
222 the variable.
223 The output can be very helpful during debugging.
224 </para>
225
226 <para>
227 Variables that are exported to the environment are preceded by
228 <filename>export</filename> in the output of
229 <filename>bitbake -e</filename>.
230 See the following example:
231 <literallayout class='monospaced'>
232 export CC="i586-poky-linux-gcc -m32 -march=i586 --sysroot=/home/ulf/poky/build/tmp/sysroots/qemux86"
233 </literallayout>
234 </para>
235 </section>
236
186 <section id='usingpoky-debugging-taskrunning'> 237 <section id='usingpoky-debugging-taskrunning'>
187 <title>Running Specific Tasks</title> 238 <title>Running Specific Tasks</title>
188 239
@@ -319,7 +370,6 @@
319 370
320 </section> 371 </section>
321 372
322
323 <section id='usingpoky-debugging-dependencies'> 373 <section id='usingpoky-debugging-dependencies'>
324 <title>Dependency Graphs</title> 374 <title>Dependency Graphs</title>
325 375
@@ -410,23 +460,6 @@
410 </para> 460 </para>
411 </section> 461 </section>
412 462
413 <section id='usingpoky-debugging-variables'>
414 <title>Variables</title>
415 <para>
416 You can use the <filename>-e</filename> BitBake option to
417 display the parsing environment for a configuration.
418 The following displays the general parsing environment:
419 <literallayout class='monospaced'>
420 $ bitbake -e
421 </literallayout>
422 This next example shows the parsing environment for a specific
423 recipe:
424 <literallayout class='monospaced'>
425 $ bitbake -e <replaceable>recipename</replaceable>
426 </literallayout>
427 </para>
428 </section>
429
430 <section id='recipe-logging-mechanisms'> 463 <section id='recipe-logging-mechanisms'>
431 <title>Recipe Logging Mechanisms</title> 464 <title>Recipe Logging Mechanisms</title>
432 <para> 465 <para>