[libcxx-commits] [libcxx] [llvm] [libc++] Update the AppleClang version (PR #193711)

[Nikolas Klauser via libcxx-commits]

https://github.com/philnik777 created https://github.com/llvm/llvm-project/pull/193711

None

>From ef1373fe951871dfc42f49656bccebd6ae36db38 Mon Sep 17 00:00:00 2001
From: Nikolas Klauser <nikolasklauser at berlin.de>
Date: Thu, 23 Apr 2026 12:20:39 +0200
Subject: [PATCH] [libc++] Update the AppleClang version

---
 .github/workflows/libcxx-build-and-test.yaml | 16 ++++++++--------
 libcxx/docs/index.rst                        |  2 +-
 libcxx/include/__configuration/compiler.h    |  4 ++--
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/.github/workflows/libcxx-build-and-test.yaml b/.github/workflows/libcxx-build-and-test.yaml
index 83f8f89ac5fe2..045b57de6a862 100644
--- a/.github/workflows/libcxx-build-and-test.yaml
+++ b/.github/workflows/libcxx-build-and-test.yaml
@@ -197,13 +197,13 @@ jobs:
       matrix:
         include:
         - config: generic-cxx03
-          os: macos-15
+          os: macos-26
         - config: generic-cxx23
-          os: macos-15
+          os: macos-26
         - config: generic-modules
-          os: macos-15
+          os: macos-26
         - config: apple-configuration
-          os: macos-15
+          os: macos-26
         # TODO: These jobs are intended to test back-deployment (building against ToT libc++ but running against an
         #       older system-provided libc++.dylib). Doing this properly would require building the test suite on a
         #       recent macOS using a recent Clang (hence recent Xcode), and then running the actual test suite on an
@@ -215,9 +215,9 @@ jobs:
         #       macOS versions as a way to avoid rotting that configuration, but it doesn't provide a lot of additional
         #       coverage.
         - config: apple-system
-          os: macos-15
+          os: macos-26
         - config: apple-system-hardened
-          os: macos-15
+          os: macos-26
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout at de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
@@ -225,8 +225,8 @@ jobs:
           persist-credentials: false
       - uses: maxim-lobanov/setup-xcode at ed7a3b1fda3918c0306d1b724322adc0b8cc0a90 # v1.7.0
         with:
-          # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
-          xcode-version: '26.0'
+          # https://github.com/actions/runner-images/blob/main/images/macos/macos-26-Readme.md
+          xcode-version: '26.4'
       - uses: seanmiddleditch/gha-setup-ninja at 3b1f8f94a2f8254bd26914c4ab9474d4f0015f67 # v6
       - name: Build and test
         run: |
diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
index 266f8c1b8ca04..38f77580d4530 100644
--- a/libcxx/docs/index.rst
+++ b/libcxx/docs/index.rst
@@ -132,7 +132,7 @@ velocity, libc++ drops support for older compilers as newer ones are released.
 Compiler     Versions            Restrictions               Support policy
 ============ =================== ========================== =====================
 Clang        21, 22, 23-git                                 latest two stable releases per `LLVM's release page <https://releases.llvm.org>`_ and the development version
-AppleClang   26.0                                           latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
+AppleClang   26.4                                           latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
 Open XL      17.1.4 (AIX)                                   latest stable release per `Open XL's documentation page <https://www.ibm.com/docs/en/openxl-c-and-cpp-aix>`_
 GCC          15                  In C++11 or later only     latest stable release per `GCC's release page <https://gcc.gnu.org/releases.html>`_
 ============ =================== ========================== =====================
diff --git a/libcxx/include/__configuration/compiler.h b/libcxx/include/__configuration/compiler.h
index 6ee7400cd1755..4c3dbbfc7d412 100644
--- a/libcxx/include/__configuration/compiler.h
+++ b/libcxx/include/__configuration/compiler.h
@@ -37,8 +37,8 @@
 #      warning "Libc++ only supports Clang 21 and later"
 #    endif
 #  elif defined(_LIBCPP_APPLE_CLANG_VER)
-#    if _LIBCPP_APPLE_CLANG_VER < 1700
-#      warning "Libc++ only supports AppleClang 26 and later"
+#    if _LIBCPP_APPLE_CLANG_VER < 2100
+#      warning "Libc++ only supports AppleClang 26.4 and later"
 #    endif
 #  elif defined(_LIBCPP_GCC_VER)
 #    if _LIBCPP_GCC_VER < 1500