[PATCH] x86-64: Don't set GLRO(dl_platform) to NULL [BZ #22299]

[Florian Weimer]

On 10/19/2017 04:41 PM, H.J. Lu wrote:
> +      if (platform)
> +	GLRO(dl_platform) = platform;

This should use “if (platform != NULL)”.

> +ifneq (no,$(have-tunables))
> +tests += tst-platform-1
> +modules-names += tst-platformmod-1 x86_64/tst-platformmod-2
> +CFLAGS-tst-platform-1.c = -mno-avx
> +CFLAGS-tst-platformmod-1.c = -mno-avx
> +CFLAGS-tst-platformmod-2.c = -mno-avx
> +LDFLAGS-tst-platformmod-2.so = -Wl,-soname,tst-platformmod-2.so
> +$(objpfx)tst-platform-1: $(objpfx)tst-platformmod-1.so
> +$(objpfx)tst-platform-1.out: $(objpfx)x86_64/tst-platformmod-2.so
> +# Turn off AVX512F_Usable and AVX2_Usable so that GLRO(dl_platform) is
> +# always set to x86_64.
> +tst-platform-1-ENV = LD_PRELOAD=$(objpfx)\$$PLATFORM/tst-platformmod-2.so \
> +	GLIBC_TUNABLES=glibc.tune.hwcaps=-AVX512F_Usable,-AVX2_Usable
> +endif

Does this build $(objpfx)/tst-platformmod-2.so?  I think this would 
invalidate part of the test.

Thanks,
Florian