[libc++] Upgrade macOS and Xcode to 26.0

Author: philnik777

.github/workflows/libcxx-build-and-test.yaml

@@ -215,7 +215,7 @@ jobs:
       - uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
         with:
           # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-Readme.md
-          xcode-version: '16.3'
+          xcode-version: '26.0'
       - uses: seanmiddleditch/gha-setup-ninja@3b1f8f94a2f8254bd26914c4ab9474d4f0015f67 # v6
       - name: Build and test
         run: |

libcxx/docs/index.rst

@@ -133,7 +133,7 @@ velocity, libc++ drops support for older compilers as newer ones are released.
 Compiler     Versions            Restrictions               Support policy
 ============ =================== ========================== =====================
 Clang        19, 20, 21-git                                 latest two stable releases per `LLVM's release page <https://releases.llvm.org>`_ and the development version
-AppleClang   16.4                                           latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
+AppleClang   26.0                                           latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
 Open XL      17.1.3 (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>`_
 ============ =================== ========================== =====================

libcxx/test/std/language.support/support.exception/propagation/make_exception_ptr.objc.pass.mm

@@ -17,7 +17,8 @@
 // out-of-the-box.
 // REQUIRES: has-fobjc-arc && darwin
 
-// ADDITIONAL_COMPILE_FLAGS: -fobjc-arc
+// FIXME: including <Foundation/Foundation.h> seems to be currently broken with modules enabled
+// ADDITIONAL_COMPILE_FLAGS: -fobjc-arc -fno-modules
 
 #include <cassert>
 #include <exception>