[libc++] Increase the minimum deployment target on macOS to 11.0 (llvm#176094)

h-vetinari · c-rhodes · commit 2bb98857c2ee · 2026-02-16T09:06:34.000Z
llvm#166172 moved the effective minimum deployment target on macOS to 10.15 (because `aligned_alloc` is not defined before that in the C stdlib), and indeed, it was mentioned in that PR that libc++ only supports macOS 11 and later. This PR rectifies the documentation and the code to reflect the actually supported deployment targets on macOS. See [1] for additional discussion about this. [1]: https://discourse.llvm.org/t/minimum-macos-deployment-target-increases-to-11-0-in-v22-1-visibility-discussion-on-update-policy (cherry picked from commit d485417)
diff --git a/libcxx/docs/ReleaseNotes/22.rst b/libcxx/docs/ReleaseNotes/22.rst
@@ -106,6 +106,8 @@ Improvements and New Features
 Deprecations and Removals
 -------------------------
 
+- The minimally supported deployment target on macOS has been increased to 11.0.
+
 Potentially breaking changes
 ----------------------------
 
diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
@@ -143,7 +143,7 @@ Libc++ also supports common platforms and architectures:
 ===================== ========================= ============================
 Target platform       Target architecture       Notes
 ===================== ========================= ============================
-macOS 10.13+          i386, x86_64, arm64
+macOS 11.0+           i386, x86_64, arm64       Deployment target lower bound is the minimum between what Chrome resp. the last stable `Xcode release <https://developer.apple.com/support/xcode>`_ support
 FreeBSD 12+           i386, x86_64, arm
 Linux                 i386, x86_64, arm, arm64  Only glibc-2.24 and later and no other libc is officially supported
 Android 5.0+          i386, x86_64, arm, arm64
diff --git a/libcxx/include/__configuration/availability.h b/libcxx/include/__configuration/availability.h
@@ -196,11 +196,11 @@
     __attribute__((availability(bridgeos, strict, introduced = 6.0)))                                             \
     __attribute__((availability(driverkit, strict, introduced = 21.3)))
 
-#  if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)  && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__  < 101300) || \
+#  if (defined(__ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__)  && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__  < 110000) || \
       (defined(__ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ < 150000) || \
       (defined(__ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__)     && __ENVIRONMENT_TV_OS_VERSION_MIN_REQUIRED__     < 150000) || \
-      (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__)  && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__  < 70000)  || \
-      (defined(__ENVIRONMENT_DRIVERKIT_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_DRIVERKIT_VERSION_MIN_REQUIRED__ < 190000)
+      (defined(__ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__)  && __ENVIRONMENT_WATCH_OS_VERSION_MIN_REQUIRED__  < 80000)  || \
+      (defined(__ENVIRONMENT_DRIVERKIT_VERSION_MIN_REQUIRED__) && __ENVIRONMENT_DRIVERKIT_VERSION_MIN_REQUIRED__ < 200000)
 #  warning "The selected platform is no longer supported by libc++."
 #  endif
 
