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    SubjectRe: [PATCH] Support new egcs/pgcc -mpentium(pro) options

    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.

    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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