I've tried to built gcc-4.4.3 with different CFLAGS and CXXFLAGS variable and have found that when they are "-march=core2" there's one unexpected failure in libstdc++ tests: FAIL: abi_check. Everything else in test results is equal. I know that I should build gcc with neither CFLAGS nor CXXFLAGS set but maybe it's some kind of useful information.
-- Summary: abi_check from libstdc++ tests fails with CFLAGS="- march=core2" Product: gcc Version: 4.4.3 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: 4ernov at gmail dot com 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=43203