[all-commits] [llvm/llvm-project] b4f7a2: [libc++] Bump OS version for macOS backdeployment ...

[Louis Dionne via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b4f7a2ab578957657336a598220fce6fc00f56b5
      https://github.com/llvm/llvm-project/commit/b4f7a2ab578957657336a598220fce6fc00f56b5
  Author: Louis Dionne <ldionne.2 at gmail.com>
  Date:   2025-04-05 (Sat, 05 Apr 2025)

  Changed paths:
    M .github/workflows/libcxx-build-and-test.yaml
    M libcxx/test/libcxx/strings/basic.string/string.capacity/allocation_size.pass.cpp
    M libcxx/test/std/input.output/file.streams/fstreams/filebuf.virtuals/setbuf.pass.cpp
    M libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_double.pass.cpp
    M libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_float.pass.cpp
    M libcxx/test/std/localization/locale.categories/category.numeric/locale.num.get/facet.num.get.members/get_long_double.pass.cpp
    M libcxx/test/std/strings/basic.string/string.capacity/max_size.pass.cpp
    M libcxx/test/std/strings/basic.string/string.capacity/over_max_size.pass.cpp

  Log Message:
  -----------
  [libc++] Bump OS version for macOS backdeployment CI jobs (#131883)

In 0547e573c555, I introduced backdeployment testing on macOS using
Github-provided builders. This was done by basically building libc++ on
a slightly older macOS (like macOS 13) and then running against the
system library on that machine. However, that created a dependency that
libc++ must keep working on macOS 13, which doesn't support the
latest-released Xcode.

This patch solves that problem by moving the deployment testing to a
newer version of macOS which supports the latest-released version of
Xcode.

Sadly, that also reduces the backdeployment coverage we have since we're
not actually testing on older OSes, but is necessary to satisfy the
documented libc++ support policy. In the future, we could improve the
situation by providing a Lit configuration that allows compiling (but
not running) all the tests, building the tests on a supported macOS, and
then shipping those tests on an older backdeployment target in order to
run them against the system library. Since that requires significant
engineering, this isn't done at this time.



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