When I try to build gcc-4.5 with gcc-4.5 using -march=atom it fails when comparing stage2 and 3:
Comparing stages 2 and 3 warning: gcc/cc1plus-checksum.o differs warning: gcc/cc1-checksum.o differs Bootstrap comparison failure! gcc/graphite-interchange.o differs gcc/dwarf2out.o differs gcc/tree-cfg.o differs gcc/gcc.o differs gcc/ipa-struct-reorg.o differs gcc/tree-outof-ssa.o differs gcc/reg-stack.o differs gcc/cgraphbuild.o differs gcc/profile.o differs gcc/sched-rgn.o differs gcc/cfgexpand.o differs gcc/collect2.o differs gcc/sched-ebb.o differs gcc/tree-ssa-ccp.o differs gcc/omega.o differs gcc/tree-if-conv.o differs gcc/tree-vect-slp.o differs gcc/tree-ssa-reassoc.o differs gcc/tree-ssa-structalias.o differs gcc/fortran/trans-io.o differs gcc/fortran/trans.o differs gcc/fortran/arith.o differs gcc/fortran/decl.o differs gcc/tree-ssa-loop-ivopts.o differs gcc/gimple-pretty-print.o differs gcc/tree-switch-conversion.o differs gcc/graph.o differs gcc/cp/call.o differs gcc/c-lex.o differs gcc/opts.o differs gcc/varasm.o differs gcc/tree-vect-loop-manip.o differs gcc/bt-load.o differs gcc/diagnostic.o differs gcc/tree-ssa-live.o differs gcc/tree-ssa-dom.o differs gcc/reload.o differs gcc/tree-parloops.o differs gcc/tree-pretty-print.o differs gcc/params.o differs gcc/builtins.o differs gcc/lto-streamer-in.o differs gcc/sched-deps.o differs gcc/haifa-sched.o differs gcc/cse.o differs gcc/ipa-prop.o differs gcc/c-pragma.o differs gcc/tree-vrp.o differs gcc/c-common.o differs gcc/print-tree.o differs gcc/tree-affine.o differs gcc/graphite-clast-to-gimple.o differs gcc/tree-eh.o differs gcc/c-parser.o differs gcc/tree-phinodes.o differs gcc/tree-data-ref.o differs gcc/lambda-code.o differs gcc/build/gengtype-parse.o differs gcc/ipa-type-escape.o differs gcc/ipa-cp.o differs gcc/tree-inline.o differs libcpp/files.o differs libcpp/traditional.o differs libcpp/lex.o differs libcpp/charset.o differs libiberty/regex.o differs libiberty/pic/regex.o differs make[2]: *** [compare] Fel 1 make[2]: Leaving directory `/tmp/portage/sys-devel/gcc-4.5.0/work/build' make[1]: *** [stage3-bubble] Fel 2 make[1]: Leaving directory `/tmp/portage/sys-devel/gcc-4.5.0/work/build' make: *** [bootstrap-lean] Fel 2 Initially gcc-4.5 was built with gcc-4.4.3 using -march=core2 -mtune=generic. This is my first GCC bug report so I'm not sure what else I need to provide. -- Summary: Bootstrap comparison fails when using -march=atom Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: nisselarsson at home dot se http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43921