diff options
Diffstat (limited to 'bitbake')
-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 @@ You select the os-specific version of the <filename>TEST</filename> variable by appending the "os" override to the variable (i.e.<filename>TEST_os</filename>). + </para> + + <para> + To better understand this, consider a practical example + that assumes an OpenEmbedded metadata-based Linux + kernel recipe file. + The following lines from the recipe file first set + the kernel branch variable <filename>KBRANCH</filename> + to a default value, then conditionally override that + value based on the architecture of the build: + <literallayout class='monospaced'> + KBRANCH = "standard/base" + KBRANCH_qemuarm = "standard/arm-versatile-926ejs" + KBRANCH_qemumips = "standard/mti-malta32" + KBRANCH_qemuppc = "standard/qemuppc" + KBRANCH_qemux86 = "standard/common-pc/base" + KBRANCH_qemux86-64 = "standard/common-pc-64/base" + KBRANCH_qemumips64 = "standard/mti-malta64" + </literallayout> </para></listitem> <listitem><para><emphasis>Appending and Prepending:</emphasis> BitBake also supports append and prepend operations to @@ -416,6 +435,18 @@ </literallayout> In this example, <filename>DEPENDS</filename> becomes "glibc ncurses libmad". + </para> + + <para> + Again using a kernel recipe file as an example, the + following lines will conditionally append to the + <filename>KERNEL_FEATURES</filename> variable based + on the architecture: + <literallayout class='monospaced'> + KERNEL_FEATURES_append = " ${KERNEL_EXTRA_FEATURES}" + KERNEL_FEATURES_append_qemux86=" cfg/sound.scc cfg/paravirt_kvm.scc" + KERNEL_FEATURES_append_qemux86-64=" cfg/sound.scc cfg/paravirt_kvm.scc" + </literallayout> </para></listitem> </itemizedlist> </para> |