[PATCH] aarch64: Fix f{max,min}{f} build for GCC 4.9 and 5

[Szabolcs Nagy]

On 17/11/17 10:32, Adhemerval Zanella wrote:
> GCC 4.9 and 5 do not generate a correct f{max,min}nm instruction for
> __builtin_{fmax,fmin}{f} without -ffinite-math-only.  It is clear a
> compiler issue since the instruction can handle NaN and Inf correctly
> and GCC6+ does not show this issue.
> 
> We backport a fix to GCC 5, raise the minimum required GCC version
> for aarch64 (since GCC 4.9 branch is now closed) and/or add configure
> check to check for this issue.  However I think -ffinit-math-only
> should be safe for these specific implementation and it is a much
> simpler solution.
> 
> Checked on aarch64-linux-gnu with GCC 5.3.1.
> 
> 	* sysdeps/aarch64/fpu/Makefile (CFLAGS-s_fmax.c, CFLAGS-s_fmaxf.c,
> 	CFLAGS-s_fmin.c, CFLAGS-s_fminf.c): New rule: add -ffinite-math-only.
> 

OK.