Re: Predefine _M_IX86 in gcc

----- Original Message -----
From: "Earnie Boyd" <earnie_boyd-/[email protected]>
To: "Cosmin Truta" <[email protected]>
Cc: "Danny Smith" <[email protected]>;
<[email protected]>
Sent: Saturday, 21 December 2002 19:38
Subject: Re: [MinGW-patches] Predefine _M_IX86 in gcc


> Cosmin Truta wrote:
> >
> > I've just looked into the mingw specs, and I saw in the long line
> >   "... march=i486:-D__i486 -D__i486__ ..."
> > which can go into
> >   "... march=i486:-D__i486 -D__i486__ -D_M_IX86=400 ..."
> >
>
> Danny, I think Cosmin's points are valid based on code I've seen
> floating around.  However, should the macro definition be based on
mcpu
> or march?
>

-march, if it is to be useful  It would then provide information on what
insn set is available, not just how scheduling of the i386 insn set is
tuned.  The __i386__, __i486__  predefines  are based on -march
.
As I said in my ealrlier post, Cosmin's points may be valid, but adding
this nice feature has much lower priority for me than fixing other
problems    I  don't think manually editting the specs file after the
build is a good thing to do.  So I will look forward to Cosmin's patch
to gcc

Danny

> Earnie.
>
>
>
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