re PR libstdc++/25913 (Client's isnormal function is broken by cmath)

re PR libstdc++/25913 (Client's isnormal function is broken by cmath)

2007-11-26  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/25913
	* include/c_std/cmath (std::fpclassify, isfinite, isinf, isnan,
	isnormal, signbit, isgreater, isgreaterequal, isless, islessequal,
	islessgreater, isunordered): Guard with __enable_if and forward
	with __promote.
	* include/c_global/cmath: Likewise.
	* testsuite/26_numerics/headers/cmath/25913.cc: New.

	* include/c_std/cmath (__gnu_cxx::__capture_isfinite,
	__capture_isinf, __capture_isnan, __capture_isnormal,
	__capture_signbit, __capture_isgreater, __capture_isgreaterequal,
	__capture_isless, __capture_islessequal, __capture_islessgreater,
	__capture_isunordered): Remove.
	(std::isfinite, isinf, isnan, isnormal, signbit, isgreater,
	isgreaterequal, isless, islessequal, islessgreater, isunordered):
	Forward to the corresponding builtin.
	* include/c_global/cmath: Likewise.

	* include/c_global/cmath (std::atan2, pow): Guard with __enable_if.

From-SVN: r130443