[llvm-bugs] [Bug 50758] New: Cherry-pick 76fc35752d19ac605c1c1fd757af9c7c3bb4a906 to release/12.x

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50758

            Bug ID: 50758
           Summary: Cherry-pick 76fc35752d19ac605c1c1fd757af9c7c3bb4a906
                    to release/12.x
           Product: libc++
           Version: 12.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ldionne at apple.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com
            Blocks: 49317

That is:

    [libc++] Make feature-test macros consistent with availability macros

    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

    Differential Revision: https://reviews.llvm.org/D94983


Referenced Bugs:

https://bugs.llvm.org/show_bug.cgi?id=49317
[Bug 49317] [meta] 12.0.1 Release Blockers
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