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    SubjectRe: Possible GCC contamination of Linux
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    "Richard B. Johnson" <root@chaos.analogic.com> said:
    > On Wed, 22 Sep 1999, Horst von Brand wrote:
    > > "Richard B. Johnson" <root@chaos.analogic.com> said:
    > > > On Wed, 22 Sep 1999, Artur Skawina wrote:
    > > > > Kurt Garloff wrote:

    > > > > > a patch which adds -fno-builtins to the Makefile and makes the
    > > > > > abs() work.

    > > > > why?

    > > > So you can compile a i386 or i486 kernel with a 'C' compiler that was
    > > > built on a i686 machine. It took me a week to find the reason why
    > > > a kernel, configured to run on a 486 (or even 386) would crash on
    > > > the boot of a 486.

    > > If the compiler gives you i686 instructions for a i486 target that you
    > > correctly specified, then the compiler is broken, pure and simple. Are you
    > > sure the Makefiles do set the target right? What gcc version are you using?
    > > Did you report the problem to the egcs folks?

    > I've been through this too many times already. The makefile is set up
    > right, the .config is set up right. I have used three versions of
    > the gcc compiler, never egcs.
    >
    > gcc 2.7.2, gcc 2.7.3, and gcc 2.8.1

    Then those are broken, as I stated. Note that all of them are obsolete and
    non-maintained.

    [...]

    > My suggestion was to not use any built-ins in the kernel. In other
    > words, if the kernel requires code it should be generated by kernel
    > source, not C-compiler source.

    Yep. No coding in C, only assembler.
    --
    Dr. Horst H. von Brand mailto:vonbrand@inf.utfsm.cl
    Departamento de Informatica Fono: +56 32 654431
    Universidad Tecnica Federico Santa Maria +56 32 654239
    Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513

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