[Bug c++/54130] Recognize builtins with bool return type

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54130

--- Comment #6 from Marc Glisse <glisse at gcc dot gnu.org> 2012-07-31 20:13:38 
UTC ---
(In reply to comment #5)
> If your system headers declare isnan with bool return type I advise making 
> fixincludes fix them.

But the C++ standard requires a bool return type, using fixinclude to replace a
standard prototype with a non-standard one is strange...