cmake: add default Werror, extract version only from GITHUB_REF if tag

.github/workflows/test.yaml

@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Configure CMake
-        run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}} -DCMAKE_CXX_FLAGS="-Werror"
+        run: cmake -B ${{github.workspace}}/build -DCMAKE_BUILD_TYPE=${{env.BUILD_TYPE}}
 
       - name: Build
         run: cmake --build ${{github.workspace}}/build --config ${{env.BUILD_TYPE}}

CMakeLists.txt

@@ -24,7 +24,7 @@ project(
   VERSION ${TAG_VERSION_MAJOR}.${TAG_VERSION_MINOR}.${TAG_VERSION_PATCH}
 )
 
-add_compile_options(-Wall -Wextra -Wpedantic)
+add_compile_options(-Wall -Wextra -Wpedantic -Werror)
 
 set(PACKAGE_VERSION ${TAG_VERSION_MAJOR}.${TAG_VERSION_MINOR}.${TAG_VERSION_PATCH})
 

cmake/Versioning.cmake

@@ -8,7 +8,7 @@ if(GIT_EXECUTABLE)
         OUTPUT_STRIP_TRAILING_WHITESPACE
     )
 
-    if(DEFINED ENV{GITHUB_REF})
+    if(DEFINED ENV{GITHUB_REF} AND ENV{GITHUB_REF_TYPE} EQUAL "tag")
         set(TAG_VERSION $ENV{GITHUB_REF})
         message(STATUS "Extracted version from GITHUB_REF")
     endif()