Re: Lowering compiler optimisation with Apple gcc

["Justin C. Walker" <justin@mac.com>]

On Dec 15, 2006, at 12:49 , Jason Martin wrote:

> I've had excellent luck on my Core 2 Mac with the latest version of  
> gcc using
>
>   CFLAGS="-m64 -fast"
>
> I've also ported and optimized GMP for Core 2 Macs, and using my port
> of GMP I get Pari benchmarks on my Mac Pro that out perform all of the
> Opteron machines I have access to.  For details, see my website (in my
> signature).
>
> I have not encountered any "bugs" in Apple's gcc, but I have
> encountered "frustrations" because the Apple gcc options are not
> compatible with the Linux options that I'm familiar with.
>
> One subtle point of building for Core 2 Macs is that current versions
> of the autoconf tools do not correctly detect the CPU type.  This is
> because the "uname -m" command returns the rather unhelpful "i386"
> rather than the "x86_64" that one might expect.  So, you have to
> manually detect the CPU (Agner Fog has some nice routines for this).

Thanks for posting these tidbits.  They will prove useful.

Justin

--
Justin C. Walker, Curmudgeon at Large
Director
Institute for the Enhancement of the Director's Income
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Nobody knows the trouble I've been
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