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From: "p.finizio at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/52132] [4.7 Regression] ICE in loc_descriptor
Date: Mon, 06 Feb 2012 23:02:00 -0000
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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.