[CMake] How do I create a dependency to copy (touched) resource files when building an executable?

[Eric Wing]

I need to copy resource files from the source directory to the binary
directory with the creation of my executable. I want CMake's
dependency tracking to handle (re)copying these files whenever the
source has been touched.

Looking at other similar questions like:
http://stackoverflow.com/questions/17018477/cmake-adding-custom-resources-to-build-directory
and the CMake FAQ: How can I add a dependency to a source file which
is generated in a subdirectory?
http://www.cmake.org/Wiki/CMake_FAQ

I expected the following (simplified) code to work, but it doesn't. I
see the add_custom_target processed in the make chain, but the
add_custom_command never triggers.



project(foo)

cmake_minimum_required(VERSION 2.8)

add_executable(fooexe
	${CMAKE_SOURCE_DIR}/foo.c
	${CMAKE_SOURCE_DIR}/asset1.lua
#	${CMAKE_SOURCE_DIR}/subdir/subasset1.lua
)

add_custom_command(
	OUTPUT "${CMAKE_BINARY_DIR}/${CMAKE_CFG_INT}/asset1.lua"
	COMMAND ${CMAKE_COMMAND} -E copy_if_different
"${CMAKE_SOURCE_DIR}/asset1.lua"
"${CMAKE_BINARY_DIR}/${CMAKE_CFG_INT}/"
	DEPENDS "${CMAKE_SOURCE_DIR}/asset1.lua"
	COMMENT "Copying asset1.lua"
)

# files are only copied if a target depends on them
add_custom_target(fooresources ALL DEPENDS "${CMAKE_SOURCE_DIR}/asset1.lua"
	COMMENT "fooresources custom target"
	)
ADD_DEPENDENCIES(fooexe fooresources)



Would somebody explain to me the correct way to handle this?


Thanks,
Eric