2011-09-17  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/50441
	* acinclude.m4 ([GLIBCXX_ENABLE_INT128_FLOAT128]): Add.
	* configure.ac: Call it.
	* include/std/type_traits (__is_integral_helper<__int128_t>,
	__is_integral_helper<__uint128_t>,
	__is_floating_point_helper<__float128>,
	__make_unsigned<__int128_t>, __make_signed<__uint128_t>): Add.
	* testsuite/20_util/make_signed/requirements/typedefs-1.cc: Extend.
	* testsuite/20_util/make_signed/requirements/typedefs-2.cc: Likewise.
	* testsuite/20_util/make_unsigned/requirements/typedefs-1.cc: Likewise.
	* testsuite/20_util/make_unsigned/requirements/typedefs-2.cc: Likewise.
	* testsuite/20_util/is_signed/value.cc: Likewise.
	* testsuite/20_util/is_unsigned/value.cc: Likewise.
	* testsuite/20_util/is_integral/value.cc: Likewise.
	* testsuite/20_util/is_floating_point/value.cc: New.
	* testsuite/20_util/is_floating_point/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_floating_point/requirements/
	explicit_instantiation.cc: Likewise.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc: Adjust
	dg-error line numbers.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.
	* testsuite/20_util/declval/requirements/1_neg.cc: Likewise.
	* configure: Regenerate.
	* config.h.in: Likewise.

From-SVN: r178933