upgrade v4l2wrapper and use its makefile

CMakeLists.txt

@@ -8,36 +8,20 @@ set(CMAKE_BUILD_TYPE DEBUG)
 set(CMAKE_C_FLAGS "-Wall")
 set(CMAKE_CXX_FLAGS "-Wall")
 
-add_custom_target(git_update
-    COMMAND git submodule init
-    COMMAND git submodule update
-    WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
-    )
-
 # define executable to build
 include_directories("${PROJECT_BINARY_DIR}/inc")
 aux_source_directory(src SRC_FILES)
 add_executable(${PROJECT_NAME} ${SRC_FILES})
-add_dependencies(${PROJECT_NAME} git_update)
 
 # v4l2wrapper
 include_directories("${PROJECT_BINARY_DIR}/v4l2wrapper/inc")
-set_source_files_properties(${PROJECT_BINARY_DIR}/v4l2wrapper/src/V4l2Device.cpp PROPERTIES GENERATED 1)
-set_source_files_properties(${PROJECT_BINARY_DIR}/v4l2wrapper/src/V4l2Output.cpp PROPERTIES GENERATED 1)
-set_source_files_properties(${PROJECT_BINARY_DIR}/v4l2wrapper/src/V4l2Capture.cpp PROPERTIES GENERATED 1)
-set_source_files_properties(${PROJECT_BINARY_DIR}/v4l2wrapper/src/V4l2MmapCapture.cpp PROPERTIES GENERATED 1)
-set_source_files_properties(${PROJECT_BINARY_DIR}/v4l2wrapper/src/V4l2ReadCapture.cpp PROPERTIES GENERATED 1)
-
-add_library(v4l2wrapper
-    STATIC
-    v4l2wrapper/src/V4l2Device.cpp
-    v4l2wrapper/src/V4l2Output.cpp
-    v4l2wrapper/src/V4l2Capture.cpp
-    v4l2wrapper/src/V4l2MmapCapture.cpp
-    v4l2wrapper/src/V4l2ReadCapture.cpp
-    )
-target_link_libraries(${PROJECT_NAME} v4l2wrapper)
-add_dependencies(v4l2wrapper git_update)
+find_library(V4L2WRAPPER_LIBRARY v4l2wrapper PATHS "${PROJECT_BINARY_DIR}/v4l2wrapper")
+if (NOT V4L2WRAPPER_LIBRARY)
+        message(STATUS "Could not find v4l2wrapper")
+        EXEC_PROGRAM("git submodule init && git submodule update && make -C v4l2wrapper")
+	find_library(V4L2WRAPPER_LIBRARY v4l2wrapper PATHS "${PROJECT_BINARY_DIR}/v4l2wrapper")
+endif (NOT V4L2WRAPPER_LIBRARY)
+target_link_libraries(${PROJECT_NAME} ${V4L2WRAPPER_LIBRARY})
 
 #pthread
 find_package (Threads)