The introduction of tree addresses in debugging dumps has caused most lines of debugging dumps to differ. What we had before was that ordinary dumps produced with the same input & options by compilers produced in different stages of a bootstrap were reasonably diffable; Slightly different compilations where generally reasonably diffable with -fdump-unnumbered
-- Summary: dumped addresses makes diffing dumps unusable Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: other AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: amylaar at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28251