CMake avplay: do not build the app if OpenGL or GLUT are not found

cchampet · Clement Champetier · commit 8efa2eaa7432 · 2014-09-23T11:59:40.000+02:00
* Print a warning if avplay app can't be built. * Allow the user to build avTranscoder library even if dependencies of this app are not found. * fix #94
diff --git a/app/cpp/avplay/CMakeLists.txt b/app/cpp/avplay/CMakeLists.txt
@@ -5,25 +5,32 @@ set(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 include(AvTranscoderMacros)
 
 # Build app
-find_package(OpenGL REQUIRED)
-find_package(GLUT REQUIRED)
+find_package(OpenGL)
+if(OPENGL_FOUND)
+    find_package(GLUT)
+    if(GLUT_FOUND)
+        include_directories(${AVTRANSCODER_SRC_PATH} ${FFMPEG_INCLUDE_DIR})
+        include_directories( ${OPENGL_INCLUDE_DIRS}  ${GLUT_INCLUDE_DIRS} )
 
-include_directories(${AVTRANSCODER_SRC_PATH} ${FFMPEG_INCLUDE_DIR})
-include_directories( ${OPENGL_INCLUDE_DIRS}  ${GLUT_INCLUDE_DIRS} )
+        file(GLOB AVPLAY_SRC_FILES "*.cpp" "*.hpp")
+        add_executable(avplay ${AVPLAY_SRC_FILES})
+        set_target_properties(avplay PROPERTIES VERSION ${AVTRANSCODER_VERSION})
+        target_link_libraries(avplay avtranscoder-shared ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
 
-file(GLOB AVPLAY_SRC_FILES "*.cpp" "*.hpp")
-add_executable(avplay ${AVPLAY_SRC_FILES})
-set_target_properties(avplay PROPERTIES VERSION ${AVTRANSCODER_VERSION})
-target_link_libraries(avplay avtranscoder-shared ${OPENGL_LIBRARIES} ${GLUT_LIBRARY})
-
-# Install app
-install(
-	FILES "${CMAKE_CURRENT_BINARY_DIR}/avplay" "${CMAKE_CURRENT_BINARY_DIR}/avplay-${AVTRANSCODER_VERSION}"
-	PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ GROUP_EXECUTE GROUP_READ WORLD_READ WORLD_EXECUTE
-	DESTINATION "bin/"
-)
-install(
-	FILES ${CMAKE_CURRENT_SOURCE_DIR}/avplayer.man
-	RENAME avplayer.1
-	DESTINATION "share/man/man1/"
-)
+        # Install app
+        install(
+                FILES "${CMAKE_CURRENT_BINARY_DIR}/avplay" "${CMAKE_CURRENT_BINARY_DIR}/avplay-${AVTRANSCODER_VERSION}"
+                PERMISSIONS OWNER_EXECUTE OWNER_WRITE OWNER_READ GROUP_EXECUTE GROUP_READ WORLD_READ WORLD_EXECUTE
+                DESTINATION "bin/"
+        )
+        install(
+                FILES ${CMAKE_CURRENT_SOURCE_DIR}/avplayer.man
+                RENAME avplayer.1
+                DESTINATION "share/man/man1/"
+        )
+    else()
+        message("GLUT not found, will not build avplay app.")
+    endif()
+else()
+    message("OpenGL not found, will not build avplay app.")
+endif()
