[CMake] How to depend on files generated in a subdirectory?

[Zac Bergquist]

Would this work?

add_dependencies(MergeFiles SubdirTarget)
On Nov 18, 2015 12:56 PM, "Attila Krasznahorkay" <
attila.krasznahorkay at gmail.com> wrote:

> Dear All,
>
> I'm trying to do something that may be very easy to implement, but I'm
> really struggling with it at the moment...
>
> I have a project in which I generate various files in subdirectories.
> Which I add to the main project file using add_subdirectory(...). Some of
> these files I need to merge into a single file at the end of the build. For
> which I tried to set up a custom command in my main project file. But I
> can't convince this main project file to find out how to generate the files
> whose generation rule sits in a subdirectory.
>
> Attached is a simple example of what I mean. In this example it is
> possible to execute the following commands successfully:
>
> make SubdirTarget
> make
>
> Since by the time the main target is built, its source files are already
> available. But if I try to just execute "make" first, I get:
>
> Scanning dependencies of target MergeFiles
> make[2]: *** No rule to make target `subdir/file3.txt', needed by
> `merged.txt'.  Stop.
> make[1]: *** [CMakeFiles/MergeFiles.dir/all] Error 2
> make: *** [all] Error 2
>
> I tried a number of different directory/file name combinations by now, but
> the problematic thing in the end seems to be that these files are generated
> in a different directory than where I try to use them.
>
> Do you have a suggestion on how I could do something like this?
>
> Cheers,
>             Attila
>
>
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