[Intel-gfx] xf86-video-intel (git-13461a1): BROKEN with clang-3.2 due to __cpuid() not available?

[Chris Wilson]

On Tue, Feb 26, 2013 at 02:38:14PM +0100, Sedat Dilek wrote:
> On Tue, Feb 26, 2013 at 2:33 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> > On Tue, Feb 26, 2013 at 02:20:26PM +0100, Sedat Dilek wrote:
> >> On Tue, Feb 26, 2013 at 1:58 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:
> >> > On Tue, Feb 26, 2013 at 01:35:51PM +0100, Sedat Dilek wrote:
> >> >> With xf86-video-intel-git13461a1 [1] I see this:
> >> >>
> >> >> [ build-log ]
> >> >> ...
> >> >>   CC     sna_cpu.lo
> >> >> 8 warnings generated.
> >> >>   CC     sna_damage.lo
> >> >>   CC     sna_display.lo
> >> >> sna_cpu.c:47:2: error: implicit declaration of function '__cpuid' is
> >> >> invalid in C99 [-Werror,-Wimplicit-function-declaration]
> >> >>         __cpuid(1, eax, ebx, ecx, edx);
> >> >>         ^
> >> > [snip]
> >> >
> >> >> So, clang should be treated differently?
> >> >
> >> > It doesn't use cpuid.h unless the compiler claims to be gcc >= 4. It
> >> > would appear once again that clang is broken.
> >>
> >> Can you explain why clang is BROKEN in your eyes?
> >
> > Because it claims to be gcc 4, yet fails to provide a function/macro
> > provided by gcc 4.
> 
> Even clang latest-git has same file [1].
> Any workaround you can imagine?

&& !defined(__clang__)

Based on the bug reports I have, I would strongly recommend not to use
clang as it is known to miscompile the ddx. My outlook is jaundiced
though as people report the failures but not if it ever then succeeds in
not exploding during use.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre