[CMake] Run/build custom command/target only when "input" files change

[Mika.Rajala at patria.fi]

foreach(in_file ${ARGN})

....

ADD_CUSTOM_COMMAND(
        OUTPUT ${IDL_OUTPUT_DIR}/${out_file}.h
                ${IDL_OUTPUT_DIR}/${out_file}.tlb
        DEPENDS ${in_file}
        COMMAND(${MIDL_EXECUTABLE} ${in_file} <insert other args here>
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
)

....

endforeach()

i'm using this to generate files from IDL files so i can neatly list them
and because there is no way to set the working directory for the midl tool 
in cmake

I didn't put the rest of the file here because it's on another computer 
and i had to copy this by writing it.

from what i read in the "Mastering CMake" book, the DEPENDS thing should 
work.

I'v had 2 variations to the value, with absolute path and with relative, 
neither work.

I checked that they were correct by writing the value out with the 
'message' command and by testing the path printed out.

Did i miss something?

-mika




"Rolf Eike Beer" <eike at sf-mail.de> 
Sent by: cmake-bounces at cmake.org
08.03.2011 12:53

To
cmake at cmake.org
cc

Subject
Re: [CMake] Run/build custom command/target only when "input" files change






> Hi
>
> I have created a custom command that generates source code for me.
>
> There is a slight annoyance still, the command is excecuted every single
> time i tell the compiler to build.
>
> Can I make it so that it runs the program only when the source file
> changes or the target file doesn't exist?
>
> I looked at the documentation for add_custom_command and 
add_custom_target
> but found no direct anwser from either.
>
> I tried using dependencies but nothing came out of that for me.

Then show us some code on how you defined that command.

Eike
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