https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98904
--- Comment #12 from David Binderman <dcb314 at hotmail dot com> ---
(In reply to Tobias Burnus from comment #11)
> It might be that some code optimizes converts
...
> It might be that the either the middle end of GCC does this optimization or
> that valgrind does this internally.
I don't understand very much of your reply, but if you can replace
your two mights with facts, that would be IMHO a step in the right direction.
I replaced my existing fprintf code with slightly better code
on the obvious conditional:
if (flag_coarray == GFC_FCOARRAY_LIB)
{
fprintf( stderr, "flag_coarray %d\n", flag_coarray);
fprintf( stderr, "lhs_caf_attr.codimension %d\n",
lhs_caf_attr.codimension);
fprintf( stderr, "rhs_caf_attr.codimension %d\n",
rhs_caf_attr.codimension);
fprintf( stderr, "lhs_caf_attr.allocatable %d\n",
lhs_caf_attr.allocatable);
fprintf( stderr, "lhs_refs_comp %d\n", lhs_refs_comp);
fprintf( stderr, "rhs_caf_attr.allocatable %d\n",
rhs_caf_attr.allocatable);
fprintf( stderr, "rhs_refs_comp %d\n", rhs_refs_comp);
}
and, surprisingly, the problem seems to have gone away.
Mind you, I did compile with -O2 this time, not -O3 as originally specified,
so it looks like I get dodgy results if I build the fortran compiler with -O3.
I will avoid this in future. Deeper minds might want to look into this problem
some more.
