re PR libstdc++/46303 ('mutex' is not a member of 'std' failures in 30_threads/call_once/constexpr.cc, 30_threads/mutex/cons/constexpr.cc,  30_threads/once_flag/cons/constexpr.cc)

2010-11-04  Paolo Carlini  <paolo.carlini@oracle.com>

	PR libstdc++/46303
	* testsuite/30_threads/call_once/constexpr.cc: Add missing dg-require
	directives.
	* testsuite/30_threads/mutex/cons/constexpr.cc: Likewise.
	* testsuite/30_threads/once_flag/cons/constexpr.cc: Likewise.

2010-11-04  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/ratio (ratio_add, ratio_subtract, ratio_multiply,
	ratio_divide): Declare the data members constexpr.
	* testsuite/20_util/ratio/requirements/constexpr_data.cc: Extend.

From-SVN: r166319