http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47044
Summary: bootstrap comparison failure when -O2 defaults on -fgraphite-identity Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassig...@gcc.gnu.org ReportedBy: howa...@nitro.med.uc.edu On x86_64-apple-darwin10 at r168176 with... Index: gcc/opts.c =================================================================== --- gcc/opts.c (revision 168176) +++ gcc/opts.c (working copy) @@ -458,6 +458,9 @@ { OPT_LEVELS_1_PLUS, OPT_fcombine_stack_adjustments, NULL, 1 }, /* -O2 optimizations. */ +#ifdef HAVE_cloog + { OPT_LEVELS_2_PLUS, OPT_fgraphite_identity, NULL, 1 }, +#endif { OPT_LEVELS_2_PLUS, OPT_finline_small_functions, NULL, 1 }, { OPT_LEVELS_2_PLUS, OPT_findirect_inlining, NULL, 1 }, { OPT_LEVELS_2_PLUS, OPT_fpartial_inlining, NULL, 1 }, applied to default on -fgraphite-identity at -O2, a bootstrap comparison failure occurs... Comparing stages 2 and 3 warning: gcc/cc1-checksum.o differs warning: gcc/cc1obj-checksum.o differs warning: gcc/cc1objplus-checksum.o differs warning: gcc/cc1plus-checksum.o differs Bootstrap comparison failure! gcc/alias.o differs gcc/attribs.o differs gcc/bb-reorder.o differs gcc/bitmap.o differs gcc/bt-load.o differs gcc/build/genattrtab.o differs gcc/build/genautomata.o differs gcc/build/genflags.o differs gcc/build/gengenrtl.o differs gcc/build/gengtype-lex.o differs gcc/build/gengtype-state.o differs ... This problem did not occur at r167670. http://gcc.gnu.org/ml/gcc-testresults/2010-12/msg00852.html ../gcc-4.6-20101222/configure --prefix=/sw --prefix=/sw/lib/gcc4.6 --mandir=/sw/share/man --infodir=/sw/lib/gcc4.6/info --enable-languages=c,c++,fortran,objc,obj-c++,java --with-gmp=/sw --with-libiconv-prefix=/sw --with-ppl=/sw --with-cloog=/sw --with-mpc=/sw --with-system-zlib --x-includes=/usr/X11R6/include --x-libraries=/usr/X11R6/lib --program-suffix=-fsf-4.6 --enable-checking=yes --enable-cloog-backend=isl --enable-build-with-cxx