Hi all.
I just have taken some time to inspect CPUTYPE support for clang. It
seems to me that clang generates incorrect code in some cases.
The first failure point I discovered was inability to build gcc from
sources or compile something with gcc. Code produced by gcc seem to fail
whether this was gcc compiled from bootstrap or anything else:
http://lists.freebsd.org/pipermail/freebsd-multimedia/2012-October/013469.html
I started testing by commenting out CPUTYPE in make.conf. After first
rebuild I also updated the ports and installed new version of
wine-devel. And to my surprise it works like a charm. Rolling back to
the world built with CPUTYPE=native makes wine break again.
To my surprise CPUTYPE was not the cause of wine failure per se. Wine
continues to work for k6, k6-3, athlon and athlon-tbird. But it
completely fails when the world was built with athlon-4 and athlon-xp.
Trying to recompile gcc I also found that everything works and yet again
up to the athlon-tbird.
My conclusion is: clang incorrectly produces code within one of core
libraries (I haven't tested which one yet, but I suspect libgcc_s.so)
when optimizing for athlon-4 or athlon-xp.
--
Sphinx of black quartz, judge my vow.
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