[all-commits] [llvm/llvm-project] cae351: [libc++] Bump `__cpp_lib_optional` and `__cpp_lib_...

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cae351f3453a0a26ec8eb2ddaf773c24a29d929e
      https://github.com/llvm/llvm-project/commit/cae351f3453a0a26ec8eb2ddaf773c24a29d929e
  Author: A. Jiang <de34 at live.cn>
  Date:   2024-10-26 (Sat, 26 Oct 2024)

  Changed paths:
    M libcxx/docs/FeatureTestMacroTable.rst
    M libcxx/docs/Status/Cxx20Papers.csv
    M libcxx/docs/Status/Cxx2cPapers.csv
    M libcxx/include/version
    M libcxx/test/std/language.support/support.limits/support.limits.general/optional.version.compile.pass.cpp
    M libcxx/test/std/language.support/support.limits/support.limits.general/variant.version.compile.pass.cpp
    M libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
    M libcxx/utils/generate_feature_test_macro_components.py

  Log Message:
  -----------
  [libc++] Bump `__cpp_lib_optional` and `__cpp_lib_variant` (#113650)

In C++20 mode, `__cpp_lib_optional` and `__cpp_lib_variant` should be
`202106L` due to DR P2231R1.

In C++26 mode, `__cpp_lib_variant` should be bumped to `202306L` due to
P2637R3.
- Clang 16/17 shouldn't get this bumping (as member `visit` requires
explicit object parameters), but it's very tricky to make the bumping
conditionally enabled. I _hope_ unconditionally bumping in C++26 will be
OK for LLVM 20 when the support for Clang 17 is dropped.

Related PRs:
- https://reviews.llvm.org/D102119
- #83335
- #76447



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