Use clang 21 in CI.

Author: insertinterestingnamehere

.circleci/config.yml

@@ -11,7 +11,7 @@ jobs:
     #machine:
     #  image: ubuntu-2504:edge
     docker:
-      - image: ubuntu:25.04
+      - image: ubuntu:25.10
     resource_class: arm.medium
     environment:
       CC: gcc-15
@@ -48,11 +48,11 @@ jobs:
     #machine:
     #  image: ubuntu-2504:edge
     docker:
-      - image: ubuntu:25.04
+      - image: ubuntu:25.10
     resource_class: arm.medium
     environment:
-      CC: clang-20
-      CXX: clang++-20
+      CC: clang-21
+      CXX: clang++-21
     steps:
       - run: |
           apt-get update --quiet=2 || apt-get update --quiet=2 || apt-get update --quiet=2
@@ -92,11 +92,11 @@ jobs:
     #machine:
     #  image: ubuntu-2504:edge
     docker:
-      - image: ubuntu:25.04
+      - image: ubuntu:25.10
     resource_class: arm.medium
     environment:
-      CC: clang-20
-      CXX: clang++-20
+      CC: clang-21
+      CXX: clang++-21
       CFLAGS: "-fsanitize=<< parameters.sanitizer >> -fno-sanitize-recover=all"
       CXXFLAGS: "-fsanitize=<< parameters.sanitizer >> -fno-sanitize-recover=all"
       LDFLAGS: "-fsanitize=<< parameters.sanitizer >> -fno-sanitize-recover=all"
@@ -118,7 +118,7 @@ jobs:
           # tzdata is required by clang and has to be installed carefully to avoid user prompts stalling the script.
           ln -fs /usr/share/zoneinfo/America/New_York /etc/localtime
           DEBIAN_FRONTEND=noninteractive sudo apt-get install -y --no-install-recommends tzdata
-          sudo apt-get install -y clang-20
+          sudo apt-get install -y clang-21
       - run: |
           mkdir build
           cd build

.github/workflows/CI.yml

@@ -47,7 +47,7 @@ jobs:
     continue-on-error: true
     strategy:
       matrix:
-        clang_version: [14, 15, 16, 17, 18, 19]
+        clang_version: [14, 15, 16, 17, 18, 19, 20]
         scheduler: [nemesis, sherwood, distrib]
         topology: [hwloc, binders, no]
         include:
@@ -63,6 +63,9 @@ jobs:
             gcc_version: 13
           - clang_version: 19
             gcc_version: 14
+          - clang_version: 20
+            gcc_version: 15
+            container: ubuntu:25.04
     env:
       CC: clang-${{ matrix.clang_version }}
       CXX: clang++-${{ matrix.clang_version }}
@@ -259,7 +262,7 @@ jobs:
 
   sanitizers:
     runs-on: ubuntu-24.04
-    container: ubuntu:25.04
+    container: ubuntu:25.10
     continue-on-error: true
     strategy:
       matrix:
@@ -281,8 +284,8 @@ jobs:
           - sanitizer: thread
             topology: binders
     env:
-      CC: clang-20
-      CXX: clang++-20
+      CC: clang-21
+      CXX: clang++-21
       CFLAGS: "-fsanitize=${{ matrix.sanitizer }} -fno-sanitize-recover=all"
       CXXFLAGS: ${{ matrix.use_libcxx && format('-stdlib=libc++ -fsanitize={0} -fno-sanitize-recover=all', matrix.sanitizer) || format('-fsanitize={0} -fno-sanitize-recover=all', matrix.sanitizer) }}
       LDFLAGS: "-fsanitize=${{ matrix.sanitizer }} -fno-sanitize-recover=all"
@@ -301,10 +304,10 @@ jobs:
       run: |
         sudo apt-get install -y software-properties-common # Only needed in container.
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - && break || sleep 1
-        sudo apt-add-repository 'deb https://apt.llvm.org/oracular/ llvm-toolchain-oracular-20 main' && break || sleep 1
-        sudo apt-get install -y clang-20
+        sudo apt-add-repository 'deb https://apt.llvm.org/plucky/ llvm-toolchain-plucky-21 main' && break || sleep 1
+        sudo apt-get install -y clang-21
     - if: ${{ matrix.use_libcxx }}
-      run: sudo apt-get install -y libc++-20-dev libc++abi-20-dev
+      run: sudo apt-get install -y libc++-21-dev libc++abi-21-dev
     - if: ${{ matrix.topology != 'no' }}
       run: |
         sudo apt-get install -y hwloc libhwloc-dev
@@ -324,7 +327,7 @@ jobs:
 
   linux-thorough:
     runs-on: ubuntu-24.04
-    container: ubuntu:25.04
+    container: ubuntu:25.10
     continue-on-error: true
     strategy:
       matrix:
@@ -337,8 +340,8 @@ jobs:
           - compiler: gcc
             use_libcxx: true
     env:
-      CC: ${{ matrix.compiler == 'gcc' && 'gcc-15' || 'clang-20' }}
-      CXX: ${{ matrix.compiler == 'gcc' && 'g++-15' || 'clang++-20' }}
+      CC: ${{ matrix.compiler == 'gcc' && 'gcc-15' || 'clang-21' }}
+      CXX: ${{ matrix.compiler == 'gcc' && 'g++-15' || 'clang++-21' }}
       CXXFLAGS: ${{ matrix.use_libcxx && '-stdlib=libc++' || '' }}
       QTHREADS_ENABLE_ASSERTS: ${{ matrix.use_asserts && '--enable-asserts' || '' }}
     steps:
@@ -353,10 +356,10 @@ jobs:
       run: |
         sudo apt-get install -y software-properties-common # Only needed in container.
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - && break || sleep 1
-        sudo apt-add-repository 'deb https://apt.llvm.org/oracular/ llvm-toolchain-oracular-20 main' && break || sleep 1
-        sudo apt-get install -y clang-20
+        sudo apt-add-repository 'deb https://apt.llvm.org/plucky/ llvm-toolchain-plucky-21 main' && break || sleep 1
+        sudo apt-get install -y clang-21
     - if: ${{ matrix.use_libcxx }}
-      run: sudo apt-get install -y libc++-20-dev libc++abi-20-dev
+      run: sudo apt-get install -y libc++-21-dev libc++abi-21-dev
     - if: ${{ matrix.topology != 'no' }}
       run: |
         sudo apt-get install -y hwloc libhwloc-dev
@@ -377,14 +380,14 @@ jobs:
     runs-on: ubuntu-24.04
     continue-on-error: true
     env:
-      CC: 'clang-20'
-      CXX: 'clang++-20'
+      CC: 'clang-21'
+      CXX: 'clang++-21'
     steps:
     - uses: actions/checkout@v4
     - run: |
         wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - && break || sleep 1
-        sudo apt-add-repository 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-20 main' && break || sleep 1
-        sudo apt-get install clang-format-20
+        sudo apt-add-repository 'deb https://apt.llvm.org/noble/ llvm-toolchain-noble-21 main' && break || sleep 1
+        sudo apt-get install clang-format-21
     - name: check formatting
       run: |
         clang-format --version

clang-format.sh

@@ -1 +1 @@
-find -iname *.h -or -iname *.c -or -iname *.hpp -or -iname *.cpp | xargs clang-format-20 -i
+find -iname *.h -or -iname *.c -or -iname *.hpp -or -iname *.cpp | xargs clang-format-21 -i