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Although the meson crossfile should take care of setting the right cross environment for a target build, meson slurps any set CFLAGS, CXXFLAGS, LDFLAGS, and CPPFLAGS from the environment and injects them into the build (see mesonbuild/environment.py:get_args_from_envvars for details). This means that we are seeing native CFLAGS, CXXFLAGS, LDFLAGS, and CPPFLAGS in the target build, which is wrong and causes build failures when target and native have libraries in common (the linker gets confused and bails). That said, we *do* need to set certain vars for all builds so that meson can find the right build tools. Without this, meson will fail during its sanity checking step because it will determine the build tools to be unrunnable since they output target instead of native artifacts. The solution to all of this is to set CC, CXX, LD, and AR globally to the native tools while setting the other native vars *only* for the native build. For target builds, these vars will get overridden by the cross file as we expect. (From OE-Core rev: de7ae028c65a978969b2e06fdc1a2d08bc141a5b) Signed-off-by: Martin Kelly <mkelly@xevo.com> Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com> 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.