[CMake] add_custom_command depends on output from add_custom_target

[Rolf Eike Beer]

Am Monday 01 November 2010 schrieb SK:
> I know add_custom_target does not produce output as far as CMake is
> concerned.  My situation is as follows:
> 
> A traditional make process that I cannot modify produces a target on
> which I must do some post-processing.
> 
> I use add_custom_target to force the makefile to always run. I use
> add_custom_command for my post-processing steps.
> 
> How do I setup a dependency for the post-processing steps? I don't
> want to run these steps unless the external make actually updated its
> target.
> 
> The add_custom_command cannot use the name of the add_custom_target as
> a DEPENDS. I tried this and it assumes that the add_custom_target name
> is just a file and cannot find it.

Please have a look at http://public.kitware.com/Bug/view.php?id=11332 , this 
describes a very similar problem IMHO (and some workarounds).

Eike
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