インストール済みのctagsを使う

.github/workflows/build-on-msys2.yml

@@ -58,6 +58,7 @@ jobs:
             mingw-w64-x86_64-python
             mingw-w64-x86_64-7zip
             mingw-w64-x86_64-gdb
+            mingw-w64-x86_64-ctags
 
       - name: Show environment variables for debug
         run: env

.github/workflows/build-sakura.yml

@@ -143,6 +143,15 @@ jobs:
         echo "C:\Program Files\OpenCppCoverage" >> $env:GITHUB_PATH
       shell: pwsh
 
+    - name: Install Ctags (winget)
+      run: |
+        winget install `
+          --id UniversalCtags.Ctags `
+          --exact `
+          --accept-package-agreements `
+          --accept-source-agreements
+      shell: pwsh
+
     - name: Set up Python
       uses: actions/setup-python@v6
       with:

src/main/cmake/ctags.cmake

@@ -18,8 +18,19 @@ set(CTAGS_ZIP_FILE "${CMAKE_SOURCE_DIR}/installer/externals/universal-ctags/ctag
 set(CTAGS_GENERATED "${CTAGS_BUILD_DIR}/ctags.exe")
 set(CTAGS_EXECUTABLE "${OUTPUT_DIRECTORY}/ctags.exe")
 
+find_program(CTAGS_SYSTEM_EXECUTABLE
+  NAMES ctags
+)
+
+if(CTAGS_SYSTEM_EXECUTABLE)
+  add_custom_command(
+    OUTPUT "${CTAGS_EXECUTABLE}"
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different "${CTAGS_SYSTEM_EXECUTABLE}" "${CTAGS_EXECUTABLE}"
+    DEPENDS "${CTAGS_SYSTEM_EXECUTABLE}"
+    COMMENT "Copying ctags.exe from system installation"
+  )
 # 実績のあるものだけビルド対象にする。
-if(CMAKE_GENERATOR MATCHES "^Visual Studio" AND NOT CMAKE_GENERATOR_PLATFORM STREQUAL "Win32")
+elseif(CMAKE_GENERATOR MATCHES "^Visual Studio" AND NOT CMAKE_GENERATOR_PLATFORM STREQUAL "Win32")
   add_custom_command(
     OUTPUT
       "${CMAKE_SOURCE_DIR}/externals/ctags/.git"