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[cpp.predefined]p2: __STDCPP_THREADS__ Defined, and has the value integer literal 1, if and only if a program can have more than one thread of execution . Also define it only if it's not defined already, since it's supposed to be defined by the compiler. Also move it from thread to __config (which requires setting it only if _LIBCPP_HAS_NO_THREADS is not defined). Part of PR33230. The intent is to eventually make the compiler define this instead. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@367316 91177308-0d34-0410-b5e6-96231b3b80d8