------- Comment #2 from ro at CeBiTec dot Uni-Bielefeld dot DE 2009-11-24
18:42 -------
Subject: Re: [4.5 regression] ICE building stage 1 libgcc on IRIX 5.3: SEGV in
compare_access_positions
> ------- Comment #1 from jamborm at gcc dot gnu dot org 2009-11-24 18:16
> -------
> Can you please add a check before the qsort call (tree-sra.c, line
> 1407) whether all pointers in the access_vec seem OK or whether it is
> SRA that passes the invalid pointer to qsort? Nothing fancy,
> something as stupid as the loop below should do:
>
> for (i =0; i < access_count; i++)
> gcc_assert (((unsigned) VEC_index (access_p, access_vec, i)) > 0x1000);
>
> If it passes I can't see any other explanation but a bad qsort. If it
> doesn't we'll need to figure out how the bad pointers get there.
It seems that the qsort is broken (although I haven't found any report
about qsort on IRIX 5.3 yet). Anyway, I've added a slightly modified
qsort from glibc to libiberty (which won't work due to license
differences, I suppose, but maybe newlib is an option), which allowed
the bootstrap to continue.
I'll later check (either with the code above or with gdb watchpoints)
what is causing the corruption.
Rainer
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42157
