The attached preprocessed file (from the mplayer sources) results in a GCC 4.5 (today's SVN snapshot) segfault when compiled with any -O flag. Compilation without -O completes correctly.
gcc -O -c -o af_format.o af_format.c af_format.pre.c: In function 'play': af_format.pre.c:1166:19: internal compiler error: Segmentation fault -- Summary: GCC 4.5 ICE segfault on any -O flag Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: il dot basso dot buffo at gmail dot com GCC host triplet: x86_64-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43238