------- Comment #3 from matz at gcc dot gnu dot org 2010-06-29 11:31 ------- Can you perhaps run the testsuite without bootstrapping (configure --disable-bootstrap; make; make check) to see if there occurs some more obvious bug than a miscompilation of genmodes? Debugging bootstrap miscompilations via bugzilla is difficult. The miscompile might be in bitmap_clear, perhaps there's something obvious, but a breaking testcase is much easier.
(I do wonder though why the miscompile happens on darwin but not linux, even though the architecture is the same) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44699
