cmake: set CMP0074 policy

This enables the use of `<PackageName>_ROOT` (environment) variables.

.github/workflows/android.yml

@@ -6,6 +6,9 @@ jobs:
   build-android:
     name: NDK-C++${{matrix.std}}-${{matrix.abi}}-${{matrix.build_type}}
     runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
     strategy:
       fail-fast: true
       matrix:
@@ -22,7 +25,6 @@ jobs:
         version: 1.10.0
 
     - name: Configure
-      shell: bash
       run: |
         cmake -S . -B build_${{matrix.abi}} \
               -DANDROID_ABI=${{matrix.abi}} \
@@ -33,7 +35,8 @@ jobs:
               -DCMAKE_CXX_STANDARD=${{matrix.std}} \
               -DCMAKE_CXX_STANDARD_REQUIRED=ON \
               -DCMAKE_TOOLCHAIN_FILE=${ANDROID_NDK_HOME}/build/cmake/android.toolchain.cmake \
-              -G Ninja
+              -G Ninja \
+              -Werror
 
     - name: Build
       run: |

.github/workflows/linux.yml

@@ -68,7 +68,8 @@ jobs:
             -DCMAKE_CXX_STANDARD_REQUIRED=ON \
             -DCMAKE_INSTALL_PREFIX=${{github.workspace}}/install \
             -DWITH_CUSTOM_PREFIX=${{matrix.extra == 'custom-prefix'}} \
-            -G Ninja
+            -G Ninja \
+            -Werror
 
       - name: Build
         run: |

.github/workflows/macos.yml

@@ -42,12 +42,13 @@ jobs:
           CXXFLAGS: -Wall -Wextra -Wsign-conversion -Wtautological-compare -Werror ${{env.CXXFLAGS}}
         run: |
           cmake -S . -B build_${{matrix.build_type}} \
-                -G "${{matrix.generator}}" \
                 -DCMAKE_CXX_EXTENSIONS=OFF \
                 -DCMAKE_CXX_FLAGS_DEBUG=-pedantic-errors  \
                 -DCMAKE_CXX_FLAGS_RELEASE=-pedantic-errors \
                 -DCMAKE_CXX_STANDARD=${{matrix.std}} \
-                -DCMAKE_CXX_STANDARD_REQUIRED=ON
+                -DCMAKE_CXX_STANDARD_REQUIRED=ON \
+                -G "${{matrix.generator}}" \
+                -Werror
 
       - name: Build
         run: |

.github/workflows/windows.yml

@@ -42,7 +42,8 @@ jobs:
                 -DCMAKE_CXX_STANDARD_REQUIRED=ON `
                 -DCMAKE_INSTALL_PREFIX:PATH=./install `
                 -DWITH_CUSTOM_PREFIX=${{matrix.extra == 'custom-prefix'}} `
-                -G "${{matrix.generator}}"
+                -G "${{matrix.generator}}" `
+                -Werror
 
       - name: Build
         run: cmake --build build_${{matrix.build_type}} `
@@ -112,7 +113,8 @@ jobs:
                 -DCMAKE_CXX_STANDARD_REQUIRED=ON \
                 -DCMAKE_INSTALL_PREFIX:PATH=./install \
                 -DWITH_CUSTOM_PREFIX=${{matrix.extra == 'custom-prefix'}} \
-                -G Ninja
+                -G Ninja \
+                -Werror
 
       - name: Build
         run: |

CMakeLists.txt

@@ -8,6 +8,10 @@ if (POLICY CMP0063)
   cmake_policy (SET CMP0063 NEW)
 endif (POLICY CMP0063)
 
+if (POLICY CMP0074)
+  cmake_policy (SET CMP0074 NEW)
+endif (POLICY CMP0074)
+
 project(glog VERSION 0.6.0 LANGUAGES CXX)
 
 set (CPACK_PACKAGE_NAME glog)