[RFA] Prec x86 MMX 3DNow! SSE SSE2 SSE3 SSSE3 SSE4 support

[Tom Tromey]

>>>>> "Joel" == Joel Brobecker <brobecker@adacore.com> writes:

>> >Let's avoid that extension, as GDB is supposed to be buildable with
>> >a non-GCC compiler.
>> 
>> I thought we had given up that requirement?

Joel> You might be right, but I don't remember us making that decision.
Joel> Anyone remembers?

I have never heard that.

We do use GCC features sometimes, but always conditionally; e.g., look
for __GNUC__ in defs.h.

Tom