Don't assume that wctype produces a nice mask on all platforms. On glibc, for instance, it's a const char *. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@134787 91177308-0d34-0410-b5e6-96231b3b80d8 
diff --git a/include/__config b/include/__config index 239f0a2..a5afbca 100644 --- a/include/__config +++ b/include/__config 
@@ -289,4 +289,8 @@  #define _LIBCPP_STABLE_APPLE_ABI  #endif   +#ifdef __APPLE__ +#define _LIBCPP_WCTYPE_IS_MASK +#endif +  #endif // _LIBCPP_CONFIG