------- Comment #13 from rearnsha at gcc dot gnu dot org 2010-09-16 16:54 ------- (In reply to comment #12) > I think it's likely there really is a miscompilation. I've not been able to > get very far trying to set up a native compiler to run on qemu, so it would > help if you could try to narrow it down a bit further. > > IIUC, stage1 and stage2 produce different output for some output files, such > as > expr.o. You could try to copy object files from stage1 to stage2, then > rebuild > the stage2 compiler with these objects, until these differences go away. In > that way, you can determine which file is being miscompiled by stage1. The > next step would be to find code generation differences for that file between > r162417 and r162418. >
You might also narrow down the source of the problem by comparing the dump files from using the two compilers -- the time at which the dumps start to diverge will be a strong indicator of the point at which the problem was introduced. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45445
