[CMake] Adding required source files to a custom target

[Attila Krasznahorkay]

Hi Nils,

Clever. I didn't even consider specifying the SOURCES argument of the custom target with a generator expression. But it seems to work perfectly.

Thanks!
             Attila

> On 03 Dec 2015, at 16:00, Nils Gladitz <nilsgladitz at gmail.com> wrote:
> 
> On 12/03/2015 03:47 PM, Attila Krasznahorkay wrote:
>> Dear All,
>> 
>> Is it possible to add additional source files to an already existing custom target?
>> 
>> My project needs to generate a number of "different things", which it does by setting up many custom commands. In order to trigger the generation of everything, I currently need to set up an inconvenient number of custom targets as well. Would it be possible to attach multiple custom commands to an already existing custom target?
>> 
> 
> e.g. this nonsense example seems to work:
> 
> cmake_minimum_required(VERSION 3.4)
> 
> add_custom_target(foo ALL
>     COMMAND ${CMAKE_COMMAND} -E echo $<TARGET_PROPERTY:foo,MY_INPUTS>
>     DEPENDS "$<TARGET_PROPERTY:foo,MY_INPUTS>"
>     VERBATIM
> )
> 
> function(add_custom_input input)
>     set(_output "${CMAKE_CURRENT_BINARY_DIR}/${input}.out")
>     set(_input "${CMAKE_CURRENT_SOURCE_DIR}/${input}")
> 
>     add_custom_command(OUTPUT ${_output}
>         COMMAND ${CMAKE_COMMAND} -E copy ${_input} ${_output}
>         DEPENDS ${_input}
>         VERBATIM
>     )
> 
>     set_property(TARGET foo APPEND PROPERTY MY_INPUTS ${_output})
> endfunction()
> 
> file(WRITE input1)
> add_custom_input(input1)
> 
> file(WRITE input2)
> add_custom_input(input2)
> Nils