[PATCH] Do not define the gcc style target specific pre-defined preprocessor macros in clang-cl

[Nico Weber]

On Wed, Jul 9, 2014 at 10:18 AM, Ehsan Akhgari <ehsan.akhgari at gmail.com>
wrote:

> On Wed, Jul 9, 2014 at 12:00 PM, Nico Weber <thakis at chromium.org> wrote:
>
>> On Wed, Jul 9, 2014 at 8:53 AM, Ehsan Akhgari <ehsan.akhgari at gmail.com>
>> wrote:
>>
>>> That's OK, the main intention behind this patch is to unbreak code that
>>> assumes gcc specific things based on #ifdef __i386__ and friends...
>>>
>>> With that in mind, does this look good to land?
>>>
>>
>> This patch also removes the #error lines from all the intrinsics headers.
>> Did you intend that to be part of this patch? It's a good idea, but the
>> backend actually asserts when they are used, like David said.
>>
>
> Those are actually the changes I had to make to make the tests pass with
> my patch.  These headers currently use the gcc style target dependent
> macros in order to decide whether or not to #error and we have tests that
> hit the #error situation (or hit unknown types because we don't include
> some headers based on these macros if you #include "immintrin.h" for
> example).  If there is a better way to fix these issues, I'd be happy to do
> that instead.
>

I think it's a reasonable change (fwiw), but the backend code should
probably be changed to not assert when using the intrinsics before this
change goes in. I don't know how involved it is to do this; I don't know if
LLVM supports a "it's fine to use SSE from intrinsics, but not for any
other codegen" mode.
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