* linkage.m4 (GLIBCXX_MAYBE_UNDERSCORED_FUNCS): New macro.
	(GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_1,
	GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_2,
	GLIBCXX_CHECK_MATH_DECL_AND_LINKAGE_3,
	GLIBCXX_CHECK_MATH_DECLS_AND_LINKAGES_1,
	GLIBCXX_CHECK_STDLIB_DECL_AND_LINKAGE_2): Use it.
	(GLIBCXX_CHECK_MATH_SUPPORT): Delete obsolete comment.
	* acconfig.h: Delete redundant macros.
	* config.h.in, configure: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@97861 138bc75d-0d04-0410-961f-82ee72b054a4