[all-commits] [llvm/llvm-project] 780854: [libc++] P2747R2: `constexpr` placement new (libra...

[A. Jiang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7808541fdea41b97dda6e5d6bf7831fabe5d5433
      https://github.com/llvm/llvm-project/commit/7808541fdea41b97dda6e5d6bf7831fabe5d5433
  Author: A. Jiang <de34 at live.cn>
  Date:   2024-08-28 (Wed, 28 Aug 2024)

  Changed paths:
    M libcxx/docs/FeatureTestMacroTable.rst
    M libcxx/docs/ReleaseNotes/20.rst
    M libcxx/docs/Status/Cxx2cPapers.csv
    M libcxx/include/__config
    M libcxx/include/new
    M libcxx/include/version
    M libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new.pass.cpp
    M libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.placement/new_array.pass.cpp
    M libcxx/test/std/language.support/support.limits/support.limits.general/new.version.compile.pass.cpp
    M libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp
    M libcxx/test/support/test_macros.h
    M libcxx/utils/generate_feature_test_macro_components.py

  Log Message:
  -----------
  [libc++] P2747R2: `constexpr` placement new (library part) (#105768)

This patch implements https://wg21.link/P2747R2.

The library changes affect direct `operator new` and `operator new[]`
calls even when the core language changes are absent.

The changes are not available for MS ABI because the `operator new` and
`operator new[]` are from VCRuntime's `<vcruntime_new.h>`. A feature
request was submitted for that [1].

As a drive-by change, the patch reformatted the whole `new.pass.cpp` and
`new_array.pass.cpp` tests.

Closes #105427

[1]: https://developercommunity.visualstudio.com/t/constexpr-for-placement-operator-newope/10730304.



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