build: Add flags to enable demo and tests

Hiding these behind a flag prevents them from being build on other
projects

CMakeLists.txt

@@ -77,5 +77,8 @@ set(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/${CMAKE_INSTALL_BINDIR})
 # Add main library subdir
 add_subdirectory(src/)
 
-enable_testing()
-add_subdirectory(tests/)
+option(BUILD_TESTS "Build test suite" OFF)
+if(BUILD_TESTS)
+  enable_testing()
+  add_subdirectory(tests/)
+endif(BUILD_TESTS)

src/CMakeLists.txt

@@ -32,33 +32,37 @@ set_target_properties(QuickPlot PROPERTIES PUBLIC_HEADER lineGeometry.h)
 
 install(TARGETS QuickPlot QuickPlotplugin)
 
-# Main target
-qt_add_executable(demo main.cpp)
-qt_add_qml_module(
-  demo
-  VERSION
-  1.0
-  URI
-  PlotDemo
-  QML_FILES
-  main.qml)
+option(BUILD_DEMO "Build Demo Executable" OFF)
+if(BUILD_DEMO)
+  # Main target
+  qt_add_executable(demo main.cpp)
+  qt_add_qml_module(
+    demo
+    VERSION
+    1.0
+    URI
+    PlotDemo
+    QML_FILES
+    main.qml)
 
-target_include_directories(
-  demo
-  PRIVATE ${PROJECT_SOURCE_DIR}/src ${PROJECT_BINARY_DIR}/src
-          ${PROJECT_SOURCE_DIR}/lib ${PROJECT_BINARY_DIR}/lib
-          ${Qt6Widgets_INCLUDE_DIRS} ${Qt6Quick3D_INCLUDE_DIRS})
+  target_include_directories(
+    demo
+    PRIVATE ${PROJECT_SOURCE_DIR}/src ${PROJECT_BINARY_DIR}/src
+            ${PROJECT_SOURCE_DIR}/lib ${PROJECT_BINARY_DIR}/lib
+            ${Qt6Widgets_INCLUDE_DIRS} ${Qt6Quick3D_INCLUDE_DIRS})
+
+  target_link_libraries(
+    demo
+    PRIVATE QuickPlot
+            QuickPlotplugin
+            Qt6::Widgets
+            Qt6::Gui
+            Qt6::Qml
+            Qt6::Core
+            Qt6::Quick3D)
 
-target_link_libraries(
-  demo
-  PRIVATE QuickPlot
-          QuickPlotplugin
-          Qt6::Widgets
-          Qt6::Gui
-          Qt6::Qml
-          Qt6::Core
-          Qt6::Quick3D)
+  set_target_properties(demo PROPERTIES RUNTIME demo)
 
-set_target_properties(demo PROPERTIES RUNTIME demo)
+  install(TARGETS demo RUNTIME)
 
-install(TARGETS demo RUNTIME)
+endif(BUILD_DEMO)