[all-commits] [llvm/llvm-project] deeb93: [libc++][format] define __cpp_lib_format. (#98275)

[Mark de Wever via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: deeb936863f26e124cc870319148b0576266f11c
      https://github.com/llvm/llvm-project/commit/deeb936863f26e124cc870319148b0576266f11c
  Author: Mark de Wever <koraq at xs4all.nl>
  Date:   2024-07-10 (Wed, 10 Jul 2024)

  Changed paths:
    M libcxx/docs/FeatureTestMacroTable.rst
    M libcxx/include/version
    M libcxx/test/std/language.support/support.limits/support.limits.general/format.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++][format] define __cpp_lib_format. (#98275)

In order to define the format __cpp_lib_format to its initial value
(201907) these papers need to be completed:
- P0645R10 Text Formatting
- P1652R1 Printf corner cases in std::format
- 1361R2 Integration of chrono with text formatting The first two have
been implemented for a while the latter is almost done.

The next value (202106) requires:
- P2216R3 std::format improvements which has been implemented

The next value (202110) requires:
- P2418R2 Add support for std::generator-like types to std::format
- P2372R3 Fixing locale handling in chrono formatters The first one has
been implemented for a while the latter is almost done. The latter paper
is a DR against 1361R2 and both are implemented at the same time.

We've had user feedback that the missing of the __cpp_lib_format makes
their lives harder (https://github.com/llvm/llvm-project/issues/77773).
The missing papers 1361R2 and P2372R3 are very close to completion and
might completed before LLVM-19, but it will be a close call. This has
been discussed in the monthly libc++ meeting and we decided to set the
__cpp_lib_format so it will be set in LLVM-19.

Based on the discussion and the implementation status the
__cpp_lib_format is set to 202110.

Fixes #77773



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