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Several fetchers support named sources that require setting a SRCREV with the source name as a suffix. These named SRCREV variables are not captured in the sstate hash calculation because they're only referenced within the bitbake fetcher function. Several recipes avoid this bug by adding the different SRCREVs to their packaging versioning but this is not enforced so it is very trivial to trip this bug case. Add a snippet to the base.bbclass anonymous python to add all named SRCREV variables to the vardeps of do_fetch to capture them in the sstate hash calculation. Testing of the bug can be shown by running the following bitbake commands with this patch set not applied: bitbake vulkan-demos | tee sed -i 's/SRCREV_gli = ".*"/SRCREV_gli = "xxx"/' \ ../meta/recipes-graphics/vulkan/vulkan-demos_git.bb bitbake vulkan-demos | tee; The above results in no errors despite a broken SRCREV because the recipe is considered unchanged by the bitbake sstate hash. After applying this patch the above commands instead result in a fetcher error which is correct. (From OE-Core rev: fdc000b8ae1577f1b29efb2cc4927664ad41e21c) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.