[libcxx-commits] [libcxx] [libc++] Set feature-test macro `__cpp_lib_atomic_float` (PR #127559)

[A. Jiang via libcxx-commits]

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@@ -2,7 +2,7 @@
 "`P0463R1 <https://wg21.link/P0463R1>`__","Endian just Endian","2017-07 (Toronto)","|Complete|","7",""
 "`P0674R1 <https://wg21.link/P0674R1>`__","Extending make_shared to Support Arrays","2017-07 (Toronto)","|Complete|","15",""
 "","","","","",""
-"`P0020R6 <https://wg21.link/P0020R6>`__","Floating Point Atomic","2017-11 (Albuquerque)","|Complete|","18",""
+"`P0020R6 <https://wg21.link/P0020R6>`__","Floating Point Atomic","2017-11 (Albuquerque)","|Complete|","18","The feature-test macro was not set until LLVM 21."
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frederick-vs-ja wrote:

Do we want to back-port this to release/20.x?

https://github.com/llvm/llvm-project/pull/127559