[cvs-nhc98] segfault-causing examples

[Isaac Dupree]

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Malcolm Wallace wrote:
> You say that your gcc gives random crashes.  My best
> guess is flaky hardware - bad memory.

Yes, I know that's the usual theory, I've run memory tests and haven't
detected any. Maybe gcc is buggy and corrupts its stack unpredictably.
Although that could just as well produce incorrect results sometimes, I
suppose.  As a reference point, my machine is a Yhc buildbot and that
seems to work fine when gcc (called by ghc) doesn't outright crash.
Hmm... compiling with -O3 with "gcc (GCC) 4.1.2 20060928 (prerelease)
(Ubuntu 4.1.1-13ubuntu5)" things (including bits of GMP) maybe isn't
quite safe? Apparently C compilers are unreliable enough these days that
"It has now come to the point where a compiler should be assumed to
miscompile GMP." <http://gmplib.org/> and "It might seem that GMP is
unusually unlucky with compilers, that it triggers more bugs than other
packages.  I believe that is an illusion.  What really is happening, is
that GMP has a test suite that will find almost every miscompilation in
the library."
<http://gmplib.org/list-archives/gmp-bugs/2007-February/000698.html>

>  Maybe there was some random
> corruption in gcc whilst building something in the runtime system.  I
> would try
>     rm targets/powerpc-Darwin8/obj/runtime
>     rm targets/powerpc-Darwin8/runtime
>     make runtime
> and see if you get the same behaviour.

rm -r targets/ppc-Linux/obj/runtime/
rm targets/ppc-Linux/runtime
make runtime
make install

This didn't help.

BTW my --prefix=/home/isaac/install/nhc98 (and I haven't put that/bin in
my PATH)


Isaac
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