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From: Richard Stallman <rms@gnu.org>
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Subject: Re: 21.2 on Irix 6.5 segfault on startup; patch.
Date: Sat, 05 Oct 2002 12:32:55 -0400
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    Compiled with gcc version egcs-2.91.66 19990314 (egcs-1.1.2 release)
    Problem seen with binutils 2.13, then I completely uninstalled
    binutils and re-compiled gcc (thus configuring to use system ld etc.)
    and rebuilt emacs. No change.

    Please describe exactly what actions triggered the bug
    and the precise symptoms of the bug:

    Seg fault & core dump on startup.

    Believe it or not, the following patch fixes things. Don't  ask me why.

I suspect that is due to a bug in the old GCC version you are using.
It is not worth debugging, but does the latest GCC work right?