Last warning when building libgfortran

[François-Xavier Coudert]

It looks like libgfortran is one warning short of being able to
compile with -Werror. Although I think it would really be nice to have
the library built with -Werror, I can't manage to remove this last
warning:

../../../gcc/libgfortran/io/list_read.c: In function 'list_formatted_read':
../../../gcc/libgfortran/io/list_read.c:1289: warning: argument 'len' might be
clobbered by 'longjmp' or 'vfork'

I admit that I have no knowledge of the way longjmp() works, so it
might be easy to fix. Could someone (perhaps the person who introduced
it in the first place?) have a look at this?

Thanks,
FX