[all-commits] [llvm/llvm-project] be087a: [libc++] Re-introduce _LIBCPP_DISABLE_AVAILABILITY...

[Louis Dionne via All-commits]

  Branch: refs/heads/release/20.x
  Home:   https://github.com/llvm/llvm-project
  Commit: be087ab35970dffe3e473b5a10266ed356261746
      https://github.com/llvm/llvm-project/commit/be087ab35970dffe3e473b5a10266ed356261746
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2025-05-09 (Fri, 09 May 2025)

  Changed paths:
    M libcxx/docs/ReleaseNotes/20.rst
    M libcxx/include/__configuration/availability.h
    A libcxx/test/libcxx/vendor/apple/disable-availability.sh.cpp

  Log Message:
  -----------
  [libc++] Re-introduce _LIBCPP_DISABLE_AVAILABILITY (#134158)

The `_LIBCPP_DISABLE_AVAILABILITY` macro was removed in afae1a5f32bb as an
intended no-op. It turns out that some projects are making use of that
macro to work around a Clang bug with availability annotations that
still exists: https://github.com/llvm/llvm-project/issues/134151.

Since that Clang bug still hasn't been fixed, I feel that we must sill
honor that unfortunate macro until we've figured out how to get rid of
it without breaking code.

(cherry picked from commit 25fc52e655fb4bfd3bb89948d5cbfe011e1b8984)



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