Interesting constant expr work in gcc land

Interesting approach:
http://gcc.gnu.org/ml/gcc-patches/2008-10/msg01061.html

-Chris

Yes, interesting... so they're finally going to fix that. Not much to
say, except that gcc does folding on expressions and clang does
evaluation as needed.

Also, note the fixincludes patch; apparently they agree that glibc's
tgmath.h isn't correct as-is.

-Eli