[Bug middle-end/21743] Enable __builtin_clog

[pcarlini at suse dot de]

------- Additional Comments From pcarlini at suse dot de  2005-05-26 17:59 -------
A fix along the way suggested by Andrew doesn't seem implementable in a very clean
way, because no DEF_*_BUILTIN category does exactly what we want: 1- only 
__builtin_* variant (BOTH_P == false); 2- fall back to library function call
(FALLBACK_P == true). I'm still looking a bit into it...

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21743