http://bugs.winehq.org/show_bug.cgi?id=4047
--- Comment #13 from Neil Skrypuch ns03ja@brocku.ca 2007-08-21 00:57:24 --- I compiled a fresh copy of 0.9.20 with GCC 4.1.2 and couldn't reproduce the original crash. Likewise, today's git also doesn't crash when compiled with GCC 4.1.2.
It seems like this was a bug in GCC, and has been fixed somewhere between GCC 4.1.1 and 4.1.2. Regardless, this bug can probably be resolved as fixed now.