[libc++][ci] Update to Clang 13.

Per our support plan we should now support Clang 12 and 13. Adjust the
documentation and the CI runners. The change indirectly moves the main
CI runners to use the Clang 14 nightly builds.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D112360

4 files changed, 12 insertions, 12 deletions

diff --git a/libcxx/docs/index.rst b/libcxx/docs/index.rst
index a4bbac7ecf25..911ee2e3998f 100644
--- a/libcxx/docs/index.rst
+++ b/libcxx/docs/index.rst
@@ -103,7 +103,7 @@ velocity, libc++ drops support for older compilers as newer ones are released.
 ============ =============== ========================== =====================
 Compiler     Versions        Restrictions               Support policy
 ============ =============== ========================== =====================
-Clang        11, 12                                     latest two stable releases per `LLVM's release page <https://releases.llvm.org>`_
+Clang        12, 13                                     latest two stable releases per `LLVM's release page <https://releases.llvm.org>`_
 AppleClang   12                                         latest stable release per `Xcode's release page <https://developer.apple.com/documentation/xcode-release-notes>`_
 GCC          11              In C++11 or later only     latest stable release per `GCC's release page <https://gcc.gnu.org/releases.html>`_
 ============ =============== ========================== =====================
diff --git a/libcxx/utils/ci/Dockerfile b/libcxx/utils/ci/Dockerfile
index 6152b0593593..4939d52456fe 100644
--- a/libcxx/utils/ci/Dockerfile
+++ b/libcxx/utils/ci/Dockerfile
@@ -55,7 +55,7 @@ RUN printf "fr_CA ISO-8859-1\ncs_CZ ISO-8859-2" >> /usr/local/share/i1en/SUPPORT
 RUN locale-gen
 
 # Install Clang <latest>, <latest-1> and ToT, which are the ones we support.
-ENV LLVM_LATEST_VERSION=12
+ENV LLVM_LATEST_VERSION=13
 RUN apt-get update && apt-get install -y lsb-release wget software-properties-common
 RUN wget https://apt.llvm.org/llvm.sh -O /tmp/llvm.sh
 RUN bash /tmp/llvm.sh $(($LLVM_LATEST_VERSION - 1)) # previous release
diff --git a/libcxx/utils/ci/buildkite-pipeline.yml b/libcxx/utils/ci/buildkite-pipeline.yml
index c26405e58b97..924bf2de4e06 100644
--- a/libcxx/utils/ci/buildkite-pipeline.yml
+++ b/libcxx/utils/ci/buildkite-pipeline.yml
@@ -174,8 +174,8 @@ steps:
           limit: 2
     timeout_in_minutes: 120
 
-  - label: "Clang 11"
-    command: "libcxx/utils/ci/run-buildbot generic-clang-11"
+  - label: "Clang 12"
+    command: "libcxx/utils/ci/run-buildbot generic-clang-12"
     artifact_paths:
       - "**/test-results.xml"
     agents:
@@ -187,8 +187,8 @@ steps:
           limit: 2
     timeout_in_minutes: 120
 
-  - label: "Clang 12"
-    command: "libcxx/utils/ci/run-buildbot generic-clang-12"
+  - label: "Clang 13"
+    command: "libcxx/utils/ci/run-buildbot generic-clang-13"
     artifact_paths:
       - "**/test-results.xml"
     agents:
diff --git a/libcxx/utils/ci/run-buildbot b/libcxx/utils/ci/run-buildbot
index 1129957f508b..744d0fd8ba85 100755
--- a/libcxx/utils/ci/run-buildbot
+++ b/libcxx/utils/ci/run-buildbot
@@ -288,17 +288,17 @@ generic-32bit)
                    -DLIBUNWIND_TEST_CONFIG="llvm-libunwind-shared.cfg.in"
     check-runtimes
 ;;
-generic-clang-11)
-    export CC=clang-11
-    export CXX=clang++-11
+generic-clang-12)
+    export CC=clang-12
+    export CXX=clang++-12
     clean
     generate-cmake -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in" \
                    -DLIBUNWIND_TEST_CONFIG="llvm-libunwind-shared.cfg.in"
     check-runtimes
 ;;
-generic-clang-12)
-    export CC=clang-12
-    export CXX=clang++-12
+generic-clang-13)
+    export CC=clang-13
+    export CXX=clang++-13
     clean
     generate-cmake -DLIBCXX_TEST_CONFIG="llvm-libc++-shared.cfg.in" \
                    -DLIBUNWIND_TEST_CONFIG="llvm-libunwind-shared.cfg.in"