[libcxx-commits] [PATCH] D94983: [libc++] Make feature-test macros consistent with availability macros

[Louis Dionne via Phabricator via libcxx-commits]

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Before this patch, feature-test macros didn't take special availability
markup into account, which means that feature-test macros can sometimes
appear to "lie". For example, if you compile in C++20 mode and target
macOS 10.13, the __cpp_lib_filesystem feature-test macro will be provided
even though the <filesystem> declarations are marked as unavailable.
This patch fixes that.

rdar://68142369


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94983

Files:
  libcxx/include/__availability
  libcxx/include/version
  libcxx/utils/generate_feature_test_macro_components.py

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