The actual snapshot gcc-4.1-20050501 fails to bootstrap if -O3 -ftree-vectorize is given as CFLAGS.
Michael Cieslinski -- Summary: bootstrap fails with CFLAGS="-O3 -ftree-vectorize" Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: micis at gmx dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: x86_64-unknown-linux-gnu GCC host triplet: x86_64-unknown-linux-gnu GCC target triplet: x86_64-unknown-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21335