[libc++] Implement <numbers>
Summary: Constants have 33 significant decimal digits for IEEE 754 128-bit floating-point numbers.
Reviewers: ldionne, #libc, EricWF, zoecarver, curdeius
Reviewed By: ldionne, #libc, curdeius
Differential Revision: https://reviews.llvm.org/D77505
Cr-Mirrored-From: https://chromium.googlesource.com/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 4f6c4b473c4a57ec597a201dee483204454c8a6d
diff --git a/docs/FeatureTestMacroTable.rst b/docs/FeatureTestMacroTable.rst
index c04a883..a6867fb 100644
--- a/docs/FeatureTestMacroTable.rst
+++ b/docs/FeatureTestMacroTable.rst
@@ -198,6 +198,8 @@
------------------------------------------------- -----------------
``__cpp_lib_list_remove_return_type`` ``201806L``
------------------------------------------------- -----------------
+ ``__cpp_lib_math_constants`` ``201907L``
+ ------------------------------------------------- -----------------
``__cpp_lib_ranges`` *unimplemented*
------------------------------------------------- -----------------
``__cpp_lib_span`` ``202002L``