rsmith added inline comments. ================ Comment at: lib/Frontend/InitPreprocessor.cpp:465 @@ +464,3 @@ + if (LangOpts.CPlusPlus1z) { + Builder.defineMacro("__cpp_lib_atomic_is_always_lock_free", "201603"); + } ---------------- This should be defined by the relevant library header, not by the compiler, to indicate the library actually provides the new symbol.
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