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1069c36417
Currently if a multiconfig build contains different configurations which have overlapping sstate artefacts, it will build them multiple times. This is clearly suboptimal and not what users want/expect. This adds code to detect this and stall all but one of the setscne tasks so that once its built, it can be found by the other tasks. We take care to iterate the multiconfigs in order so try and avoid dependency loops. We also match on PN+taskname+taskhash since this is what we know sstate in OE-Core would use. There are some tasks even within a multiconfig which match hashes (mostly do_populate_lic tasks) but those have a much higher chance of circular dependency so aren't work attempting to optimise. If a deadlock does occur the build will be slower but there is code to unbreak such a deadlock so it hopefully doens't break anything. Comments are injected into the test tasks so they have different task hashes and a new test for this optimisation is added. (Bitbake rev: a75c5fd6d4ec56836de0be2fe679c81297a080ad) 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.