diff options
Diffstat (limited to 'bitbake/doc/bitbake-user-manual')
-rw-r--r-- | bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml index 5e1a381fac..45366d5caa 100644 --- a/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml +++ b/bitbake/doc/bitbake-user-manual/bitbake-user-manual-metadata.xml | |||
@@ -403,6 +403,25 @@ | |||
403 | You select the os-specific version of the <filename>TEST</filename> | 403 | You select the os-specific version of the <filename>TEST</filename> |
404 | variable by appending the "os" override to the variable | 404 | variable by appending the "os" override to the variable |
405 | (i.e.<filename>TEST_os</filename>). | 405 | (i.e.<filename>TEST_os</filename>). |
406 | </para> | ||
407 | |||
408 | <para> | ||
409 | To better understand this, consider a practical example | ||
410 | that assumes an OpenEmbedded metadata-based Linux | ||
411 | kernel recipe file. | ||
412 | The following lines from the recipe file first set | ||
413 | the kernel branch variable <filename>KBRANCH</filename> | ||
414 | to a default value, then conditionally override that | ||
415 | value based on the architecture of the build: | ||
416 | <literallayout class='monospaced'> | ||
417 | KBRANCH = "standard/base" | ||
418 | KBRANCH_qemuarm = "standard/arm-versatile-926ejs" | ||
419 | KBRANCH_qemumips = "standard/mti-malta32" | ||
420 | KBRANCH_qemuppc = "standard/qemuppc" | ||
421 | KBRANCH_qemux86 = "standard/common-pc/base" | ||
422 | KBRANCH_qemux86-64 = "standard/common-pc-64/base" | ||
423 | KBRANCH_qemumips64 = "standard/mti-malta64" | ||
424 | </literallayout> | ||
406 | </para></listitem> | 425 | </para></listitem> |
407 | <listitem><para><emphasis>Appending and Prepending:</emphasis> | 426 | <listitem><para><emphasis>Appending and Prepending:</emphasis> |
408 | BitBake also supports append and prepend operations to | 427 | BitBake also supports append and prepend operations to |
@@ -416,6 +435,18 @@ | |||
416 | </literallayout> | 435 | </literallayout> |
417 | In this example, <filename>DEPENDS</filename> becomes | 436 | In this example, <filename>DEPENDS</filename> becomes |
418 | "glibc ncurses libmad". | 437 | "glibc ncurses libmad". |
438 | </para> | ||
439 | |||
440 | <para> | ||
441 | Again using a kernel recipe file as an example, the | ||
442 | following lines will conditionally append to the | ||
443 | <filename>KERNEL_FEATURES</filename> variable based | ||
444 | on the architecture: | ||
445 | <literallayout class='monospaced'> | ||
446 | KERNEL_FEATURES_append = " ${KERNEL_EXTRA_FEATURES}" | ||
447 | KERNEL_FEATURES_append_qemux86=" cfg/sound.scc cfg/paravirt_kvm.scc" | ||
448 | KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc cfg/paravirt_kvm.scc" | ||
449 | </literallayout> | ||
419 | </para></listitem> | 450 | </para></listitem> |
420 | </itemizedlist> | 451 | </itemizedlist> |
421 | </para> | 452 | </para> |