http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52132
--- Comment #4 from Piero Finizio <p.finizio at gmail dot com> 2012-02-06 23:01:56 UTC --- (In reply to comment #2) > Created attachment 26581 [details] > gcc47-pr52132.patch > > Untested fix. What get_true_reg does might be reasonable for code where we > have quite strict requirements on what SUBREG can be applied or not, but it is > definitely wrong for arbitrary SUBREGs in DEBUG_INSNs. In fact, I don't see > what get_true_reg would buy us, we get at the real REG in for_each_rtx anyway > and can keep the SUBREGs, FLOAT_EXTEND etc. in the DEBUG_INSN. Fix tested with gcc-4.7.0-20120126 sources, this last extracted from gcc-4.7.0-0.10.fc17.src.rpm. Now gmake works with mesa from git repository.