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

[Eric Wing]

Thanks for the reply. So the usage case is that people are going to be
modifying the resources in the source directory. (These changes have
to be checked into revision control.) So I'm having trouble seeing how
depending on the binary directory is going to work. (The reason I must
copy the resources to the binary directory is it is impossible to
launch the application through the debugger or otherwise.)

Thanks,
Eric


On 6/30/14, Petr Kmoch <petr.kmoch at gmail.com> wrote:
> Hi Eric.
>
> It seems to me that you're copying from source dir to binary dir, but all
> dependencies are on the source dir file only. Therefore, there is nothing
> to trigger the generation of the binary-dir file. Perhaps you wanted
> 'fooresources' to depend on the binary-dir file instead?
>
> Petr
>
>
> On Mon, Jun 30, 2014 at 3:20 PM, Eric Wing <ewmailing at gmail.com> wrote:
>
>> 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
>> --
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