I submitted this bug to GCC GNATS
(http://gcc.gnu.org/cgi-bin/gnatsweb.pl, PR 9758), but
they responded that it's not reproducible on Linux. So, it
must be Mingw-specific.
So, I post it here...
Logged In: YES
PR 9758 has been closed on GCC bugzilla database for awhile,
so I'll close here. If you think that was incorrect decision
please respond to GCC list.