see http://gcc.gnu.org/ml/gcc-testresults/2005-04/msg00798.html and attached files
-- Summary: lots of libobjc regressions on i686-apple-darwin7.2.1 with GCC 4.0 RC1 compared to 4.0.0 20050220 (experimental) Product: gcc Version: 4.0.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: libobjc AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: lars dot sonchocky-helldorf at hamburg dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: i686-apple-darwin7.2.1 GCC host triplet: i686-apple-darwin7.2.1 GCC target triplet: i686-apple-darwin7.2.1 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20959