build: add MUSEN_BUILD_EXAMPLES option

.github/workflows/build-and-test.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Build project
         uses: threeal/[email protected]
         with:
-          options: MUSEN_BUILD_TESTS=ON
+          options: MUSEN_BUILD_TESTS=ON MUSEN_BUILD_EXAMPLES=ON
           run-build: true
 
       - name: Test project

CMakeLists.txt

@@ -3,6 +3,7 @@ cmake_minimum_required(VERSION 3.5)
 project(musen)
 
 option(MUSEN_BUILD_TESTS "Build test targets.")
+option(MUSEN_BUILD_EXAMPLES "Build example targets.")
 
 function(cpmaddpackage)
   file(
@@ -42,13 +43,15 @@ install(TARGETS ${PROJECT_NAME}
   LIBRARY DESTINATION "lib"
   RUNTIME DESTINATION "bin")
 
-add_subdirectory("examples")
-
 if(MUSEN_BUILD_TESTS)
   enable_testing()
   add_subdirectory("test/gtest")
 endif()
 
+if(MUSEN_BUILD_EXAMPLES)
+  add_subdirectory("examples")
+endif()
+
 install(EXPORT ${PROJECT_NAME}_export
   FILE ${PROJECT_NAME}-config.cmake
   NAMESPACE ${PROJECT_NAME}::