allow to cross compile for raspberry

CMakeLists.txt

@@ -15,11 +15,11 @@ add_executable(${PROJECT_NAME} ${SRC_FILES})
 
 # v4l2wrapper
 include_directories("v4l2wrapper/inc")
-find_library(V4L2WRAPPER_LIBRARY libv4l2wrapper.a PATHS "v4l2wrapper")
+find_library(V4L2WRAPPER_LIBRARY libv4l2wrapper.a PATHS ".")
 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 libv4l2wrapper.a PATHS "v4l2wrapper")
+        EXEC_PROGRAM("git submodule init && git submodule update && make -C v4l2wrapper CC=${CMAKE_C_COMPILER} CFLAGS_EXTRA=--sysroot=${CMAKE_FIND_ROOT_PATH} && cp v4l2wrapper/libv4l2wrapper.a . && make -C v4l2wrapper clean")
+	find_library(V4L2WRAPPER_LIBRARY libv4l2wrapper.a PATHS ".")
         message(STATUS "v4l2wrapper built in V4L2WRAPPER_LIBRARY=${V4L2WRAPPER_LIBRARY}")	
 endif (NOT V4L2WRAPPER_LIBRARY)
 target_link_libraries(${PROJECT_NAME} ${V4L2WRAPPER_LIBRARY})

raspberry.toolchain

@@ -0,0 +1,6 @@
+SET(CMAKE_SYSTEM_NAME Linux)
+SET(CMAKE_SYSTEM_PROCESSOR arm)
+SET(CMAKE_C_COMPILER arm-linux-gnueabihf-gcc)
+SET(CMAKE_CXX_COMPILER arm-linux-gnueabihf-g++)
+SET(CMAKE_FIND_ROOT_PATH ${PROJECT_SOURCE_DIR}/rootfs)
+SET(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)