[all-commits] [llvm/llvm-project] fd001c: [libc++] Workaround clang bug in __has_unique_obje...

[Louis Dionne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fd001c16fed19249eec47d16ade9ad5810489c37
      https://github.com/llvm/llvm-project/commit/fd001c16fed19249eec47d16ade9ad5810489c37
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2024-06-20 (Thu, 20 Jun 2024)

  Changed paths:
    M libcxx/include/__type_traits/has_unique_object_representation.h
    A libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.compile.pass.cpp
    R libcxx/test/std/utilities/meta/meta.unary/meta.unary.prop/has_unique_object_representations.pass.cpp

  Log Message:
  -----------
  [libc++] Workaround clang bug in __has_unique_object_representations (#95314)

Clang currently has a bug in the __has_unique_object_representations
builtin where it doesn't provide consistent answers based on the order
of instantiation of templates. This was reported as #95311.

This patch adds a workaround in libc++ to avoid breaking users until
Clang has been fixed. It also revamps the tests a bit.



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