The CC test is fine and the right approach IMO; I used something similar in
ffmpeg to check whether the compiler defaults to VFP, v6 etc.:
check_asm = $(shell echo 'void foo(void) { __asm__ volatile("$(1)"); }' | $(CC)
-x c -c - -o /dev/null 2>/dev/null && echo 1 || echo 0)
vfp_asm := fadds s0, s0, s0
has_vfp := $(call check_asm, $(vfp_asm))
ifneq ($(has_vfp),1)
FLAVORS += vfp
endif
--
[arm] needs porting to thumb2
https://bugs.launchpad.net/bugs/513732
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