jfb 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");
+ }
----------------
rsmith wrote:
> This should be defined by the relevant library header, not by the compiler,
> to indicate the library actually provides the new symbol.
Ah yes, makes sense. Looks like libc++ doesn't do this for other library
features yet so I'll add it there.
This patch would then just fix test/Lexer/cxx-features.cpp for C++17 support
and have nothing to do with `is_always_lock_free`. It's probably better if I
close this patch and open a new one in that case.
http://reviews.llvm.org/D17950
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