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When compiling for Thumb or Thumb2, frame pointers _must_ be disabled since the Thumb frame pointer in r7 clashes with pulseaudio'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. References: https://www.openwall.com/lists/musl/2017/10/09/2 (From OE-Core rev: b199a9dbc3440d7c4fad8d8baeea931a6b7381c1) Signed-off-by: Catalin Enache <catalin.enache@windriver.com> Signed-off-by: Stefan Ghinea <stefan.ghinea@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>