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When compiling for Thumb or Thumb2, frame pointers _must_ be disabled since the Thumb frame pointer in r7 clashes with musl's use of inline asm to make syscalls (where r7 is used for the syscall NR). In most cases, frame pointers will be disabled automatically due to the optimisation level, but appending an explicit -fomit-frame-pointer to CFLAGS handles cases where optimisation is set to -O0 or frame pointers have been enabled by -fno-omit-frame-pointer earlier in CFLAGS, etc. Note that this limitation applies both to gcc and clang, the only difference between the two being that where gcc aborts with an error about reusing r7, clang apparently silently generates broken code: https://bugs.llvm.org/show_bug.cgi?id=34165 (From OE-Core rev: d7580cd7792982fd9e98086e4edc490635e9adca) Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Ross Burton <ross.burton@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 + qemuppc64) * 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.