cmake: fixed glog-modules.cmake installation

.github/workflows/linux-builds.yml

@@ -41,11 +41,13 @@ jobs:
           -G Ninja
         cmake --build build-googletest --target install
 
+    - name: Setup Environment
+      if: ${{matrix.build_type == 'Debug'}}
+      run: |
+        echo 'CXXFLAGS=--coverage' >> $GITHUB_ENV
+
     - name: Configure
       run: |
-        if [[ ${{matrix.build_type}} == "Debug" ]]; then
-          export CXXFLAGS=--coverage
-        fi
         cmake -S . -B build_${{matrix.build_type}} -G Ninja \
           -DBUILD_SHARED_LIBS=${{matrix.shared}} \
           -DCMAKE_CXX_STANDARD=${{matrix.std}} \
@@ -64,18 +66,34 @@ jobs:
               --config ${{matrix.build_type}} \
               --target install
 
-    - name: Test CMake Package
+        cmake build_${{matrix.build_type}} -G Ninja \
+              -DCMAKE_INSTALL_INCLUDEDIR=${{runner.workspace}}/foo/include \
+              -DCMAKE_INSTALL_LIBDIR=${{runner.workspace}}/foo/lib \
+              -DCMAKE_INSTALL_DATAROOTDIR=${{runner.workspace}}/foo/share
+        cmake --build build_${{matrix.build_type}} \
+              --config ${{matrix.build_type}} \
+              --target install
+
+    - name: Test CMake Package (relative GNUInstallDirs)
       run: |
-        if [[ ${{matrix.build_type}} == "Debug" ]]; then
-          export CXXFLAGS=--coverage
-        fi
         cmake -S src/package_config_unittest/working_config \
               -B build_${{matrix.build_type}}_package \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
               -DCMAKE_PREFIX_PATH=./build_${{matrix.build_type}}/install \
               -G Ninja
         cmake --build build_${{matrix.build_type}}_package \
               --config ${{matrix.build_type}}
 
+    - name: Test CMake Package (absolute GNUInstallDirs)
+      run: |
+        cmake -S src/package_config_unittest/working_config \
+              -B build_${{matrix.build_type}}_package_foo \
+              -DCMAKE_BUILD_TYPE=${{matrix.build_type}} \
+              -DCMAKE_PREFIX_PATH=${{runner.workspace}}/foo \
+              -G Ninja
+        cmake --build build_${{matrix.build_type}}_package_foo \
+              --config ${{matrix.build_type}}
+
     - name: Test
       run: |
         ctest --test-dir build_${{matrix.build_type}} -j$(nproc) --output-on-failure

CMakeLists.txt

@@ -1022,12 +1022,18 @@ configure_file (glog-modules.cmake.in
 install (CODE
 "
 set (glog_FULL_CMake_DATADIR \"\\\${CMAKE_CURRENT_LIST_DIR}/${glog_REL_CMake_DATADIR}\")
+set (glog_DATADIR_DESTINATION ${_glog_CMake_INSTALLDIR})
+
+if (NOT IS_ABSOLUTE ${_glog_CMake_INSTALLDIR})
+  set (glog_DATADIR_DESTINATION \"\${CMAKE_INSTALL_PREFIX}/\${glog_DATADIR_DESTINATION}\")
+endif (NOT IS_ABSOLUTE ${_glog_CMake_INSTALLDIR})
+
 configure_file (\"${CMAKE_CURRENT_SOURCE_DIR}/glog-modules.cmake.in\"
   \"${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/glog-modules.cmake\" @ONLY)
 file (INSTALL
   \"${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/glog-modules.cmake\"
   DESTINATION
-  \"\${CMAKE_INSTALL_PREFIX}/${_glog_CMake_INSTALLDIR}\")
+  \"\${glog_DATADIR_DESTINATION}\")
 "
   COMPONENT Development
 )