clang claim to be gcc 4.8.1 instead of 4.2.1

[Nico Weber]

This was discussed in this thread
http://marc.info/?t=133682946900003&r=1&w=2 People were generally
supportive of the idea, but it was deemed very hard to get glibc to build
with this ( http://marc.info/?l=cfe-dev&m=133717592322519&w=2 ) and the
benefit of doing this wasn't seen as very big in the end.

On Wed, Nov 12, 2014 at 2:55 PM, Yaron Keren <yaron.keren at gmail.com> wrote:

> gcc 4.2.1 is really old from 2008.  Some configuration headers such as
> boost "libstdcpp3.hpp" behave differently for pre-gcc 4.3 or later.
>
> gcc 4.8.1 is more recent, reasonable claim for clang.
>
> I had tried going for 4.9.1 but encountered a problem with intrinsics in
> mingw 4.9.1 intrin.h which are treated differently for gcc 4.9 or later:
>
>  * On GCC 4.9 we may always include those headers. On older GCCs, we may
> do it only if CPU
>  * features used by them are enabled, so we need to check macros like
> __SSE__ or __MMX__ first.
>  */
> #if __MINGW_GNUC_PREREQ(4, 9)
> #define __MINGW_FORCE_SYS_INTRINS
> #endif
> ...
>
> this does not work correctly with clang since the headers try to use SSE3
> instructions without __SSE3__ being defined and fail.
>
>
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>
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