[Bug target/66563] [4.9 Regression] ICE (segmentation fault) on sh4-linux-gnu

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66563

--- Comment #25 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to John Paul Adrian Glaubitz from comment #22)
> Provided that you're right, how would a bug in strlen this explain that gcc
> always segfaults when it needs to do float arithmetics?

I don't know the code of mpfr.  It could use __builtin_strlen for stuff like
parsing numbers etc.  However, the builtin_strlen code looks OK and hasn't been
causing trouble elsewhere.  So I guess that it just runs on broken data and
then causes a buffer overrun.  In other words, the actual bug is somewhere else
-- a quite common scenario for segfault class of bugs.