2013-10-06  Oleg Endo  <olegendo@gcc.gnu.org>
	    Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/58625
	* include/c_global/cmath (signbit): Use __builtin_signbitf and
	__builtin_signbitl.

Co-Authored-By: Paolo Carlini <paolo.carlini@oracle.com>

From-SVN: r203228