[Buildroot] [Bug 11996] opencv3 SIGILL on Cortex-A5 with VFPv4-D16

[bugzilla at busybox.net <bugzilla@busybox.net>]

https://bugs.busybox.net/show_bug.cgi?id=11996

--- Comment #1 from Arnout Vandecappelle <arnout@mind.be> ---
> I think this code in opencv3.mk is wrong (or maybe the ARM fpu config options
> are wrong):
>
> ifeq ($(BR2_ARCH_IS_64):$(BR2_ARM_CPU_HAS_VFPV3),:y)
> OPENCV3_CONF_OPTS += -DENABLE_VFPV3=ON
> else
> OPENCV3_CONF_OPTS += -DENABLE_VFPV3=OFF
> endif
> 
> Apparently I have BR2_ARM_CPU_HAS_VFPV3 set (even though I only have the 
> -D16 version), but when you pass -DENABLE_VFPV3=ON to OpenCV, it passes 
> -mfpu=vfpv3 to the compiler and this is what's causing the SIGILL.

If the only thing that ENABLE_VFPV3 does is to set the -mfpu=... option, then
we should just always set it to OFF, because we already pass that option.

Same for NEON, by the way.

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