[Bug 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

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46303

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2010-11-04 
13:37:13 UTC ---
the preprocessed file shows this condition in <mutex> is false:

#if defined(_GLIBCXX_HAS_GTHREADS) && defined(_GLIBCXX_USE_C99_STDINT_TR1)

so those new tests need 

// { dg-require-cstdint "" }
// { dg-require-gthreads "" }

and probably other dg-options directives, similar to
testsuite/30_threads/mutex/cons/1.cc