Re: Compiler opt

[Karl Hegbloom <hegbloom@pdx.edu>]

On Sat, 2004-08-28 at 15:05 -0500, Ron Johnson wrote:
> On Sat, 2004-08-28 at 11:55 -0700, Karl Hegbloom wrote:
> >  
> > Ok.  So then -m64 implies -march=k8 ?
> 
> It looks like you need to reverse that.  -march=k8 implies -m64.
> 
> From rom "man gcc-3.4":

Ah - Hah!  I looked at 'info gcc', not 'info gcc-3.4' or 'man gcc-3.4'.

>        -m32
>        -m64
>            Generate code for a 32-bit or 64-bit environ-
>            ment.  The 32-bit environment sets int, long and
>            pointer to 32 bits and generates code that runs
>            on any i386 system.  The 64-bit environment sets
>            int to 32 bits and long and pointer to 64 bits
>            and generates code for AMD's x86-64 architec-
>            ture.

Here's the bug.  It does not tell me, explicitly enough, whether or not
-m64 implies -march=k8 or not.  It seems to, but I'm not sure, since
perhaps -march=k8 could be incompatible with the em64t.  I think that
the documentation should be a little more clear here.

-- 
    Karl Hegbloom
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