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

Louis Dionne via Phabricator via libcxx-commits libcxx-commits at lists.llvm.org
Tue Jan 19 10:24:04 PST 2021

ldionne created this revision.
Herald added subscribers: jfb, jkorous, arichardson.
ldionne requested review of this revision.
Herald added a project: libc++.
Herald added a subscriber: libcxx-commits.
Herald added a reviewer: libc++.

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.


  rG LLVM Github Monorepo



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