>
> On Sun, 13 Dec 1998, Matthias Andree wrote:
>
> >Hello penguinoids,
> >
> >I have wrote a small patch against 2.1.131-ac9 which implements the
> >promised enhanced support for the new egcs/pgcc i386 target submodel
> >options such as -mpentium, -mpentiumpro, -march=pentium and
> >-march=pentiumpro.
> >
> >The patch should be pretty self-explanatory and touches:
> >+++ linux-2.1.131-ac9-ma/Documentation/Configure.help Sun Dec 13 05:15:06 1998
> >+++ linux-2.1.131-ac9-ma/arch/i386/Makefile Sun Dec 13 05:14:09 1998
> >+++ linux-2.1.131-ac9-ma/arch/i386/config.in Sun Dec 13 05:14:21 1998
> >
> >
> >
> >Some questions left:
> >
> >1. Does gcc 2.8 support the aforementioned options?
> >
> >2. What is the minimum egcs/pgcc version for these options?
> >
> >3. What is the reason a 486 configured kernel will not run on the 386?
> > It's evidently not the compiler as far as I can tell from my
> > gcc-2.7.2.x/pgcc-1.1.1 documentation.
> >
> >
> >
> >And *please*, do check the Configure.help if the contents are correct.
> >There are probably some gcc/egcs/pgcc gurus out there which can comment
> >on for-/backwards compatibility, particularly in context with the
> >-march= option.
> >
> >Please Cc: your answers/comments.
> >
> >Happy compiling,
> >
> >--
> >Matthias Andree
> >
>
> As to -march= option, it is available indeed both for pentium and
> pentiumpro, according to the documentaion. I remember, however, reading a
> mail posted to the pgcc mailing list some months ago, where the author
> wrote approximately :
>
> this option dosen't make sense for pentium because there are no
> architecture specific instrunctions available for it (but not for
> pentiumpro). So the valide option for pentium is -mpentium.
>
Their are alot of pentium specific instructions. Of course gcc/gas make
not support any of them.
> I'm merely a beginner user. It's possible I misunderstood the intention of
> the author.
>
> Can some experts confirm or refute the above statement?
>
> junichi
>
>
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