Allow specifying a particular clang-format binary (version), and pin the CI to version 15

.github/workflows/build.yml

@@ -74,15 +74,18 @@ jobs:
       run: cmake --build build
 
   check_format:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v3
       with:
         submodules: true
 
+    - name: Install Dependencies (Linux)
+      run: sudo apt-get update && sudo apt-get install clang-format-15
+
     - name: Configure CMake
       shell: bash
-      run: cmake -S . -B build
+      run: cmake -S . -B build -DCLANG_FORMAT_BINARY=clang-format-15
 
     - name: Check format
       shell: bash

CMakeLists.txt

@@ -427,6 +427,10 @@ if(BUILD_TOOLS)
   install(TARGETS cubeb-test)
 endif()
 
+if(NOT CLANG_FORMAT_BINARY)
+set(CLANG_FORMAT_BINARY clang-format)
+endif()
+
 add_custom_target(clang-format-check
   find
     ${CMAKE_CURRENT_SOURCE_DIR}/src
@@ -434,7 +438,7 @@ add_custom_target(clang-format-check
     -type f (-name "*.cpp" -o -name "*.c" -o -name "*.h")
     -not -path "*/subprojects/speex/*"
     -print0
-  | xargs -0 clang-format -Werror -n
+  | xargs -0 ${CLANG_FORMAT_BINARY} -Werror -n
   COMMENT "Check formatting with clang-format"
   VERBATIM)