The stage1 libgcc.a and crt files are being built with -O0. This means that the stage2 cc1 is using unoptimized libgcc.a, but the stage3 cc1 is using optimized libgcc.a, which is causing them to be different, which is one of a number of causes for
Comparing stages 2 and 3 warning: ./cc1-checksum.o differs warning: ./cc1obj-checksum.o differs warning: ./cc1plus-checksum.o differs on Darwin. I suspect this is related to PR 32009 but am not sure they're the same bug. -- Summary: stage1 libgcc is being built unoptimized Product: gcc Version: 4.3.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: geoffk at gcc dot gnu dot org GCC target triplet: *-*-darwin* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32161