[CMake] Building files with custom target

[Michael Jackson]

On Nov 28, 2008, at 8:00 AM, Pablo Yanez Trujillo wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> Hi
>
> I've got a problem and it seems that there isn't any FAQ entry to  
> solve my problem (or at least I'm to blind to find it).
>
> I'm writting a library that has a set of modules (sub-libraries  
> would match better) that depend on each other but are
> installed as separated libraries. I mean, I have this directory  
> structure:
>
> mylib
> |
> |- module1
> |  |- test
> |  |  |- samples
> |  `  `
> |- module2
> |  |- test
> |  |  |- samples
> ...
>
> In each CMakeLists.txt file of module{1,...n} I have a ADD_LIBRARY  
> command and with TARGET_LINK_LIBRARY I set the
> internal dependencies. Everything works fine in that way.
>
> Each module has a test directory for unit-test and inside this  
> directory a samples directory where you can find samples
> (not only 'how to use module' but small applications). Those  
> programs are not unit-test hence I don't want to use
> add_test for them.
>
> If I add (let's say in module2)
>
> add_executable(tcp_server test/samples/server.c)
> TARGET_LINK_LIBRARIES(tcp_server cu_tcp cu_thread)
>
> in modules2/CMakeLists.txt then the 'tcp_server' target is built  
> under 'make'. I don't want that those targets are built
> automatically, but I don't know how to do this. Besides I want to  
> create a custom target 'samples' so that iff I execute
> 'make samples' the sample-targets are built. I would like to let  
> cmake build them because cmake tracks the dependencies
> better. Is this possible at all?
>
> Thanks
> Pablo
>
>
> - --
> Pablo Yanez Trujillo
> http://klingsor.informatik.uni-freiburg.de
> My public key: http://klingsor.informatik.uni-freiburg.de/gpg/supertux.asc
>

One way to do this is to introduce an "option" to cmake:

# BUILD_SAMPLES is default to OFF
option(BUILD_SAMPLES "Build the sample Applications" OFF)

Now during ccmake or cmake time the user can select the BUILD_SAMPLES  
and turn it on.

if(BUILD_SAMPLES)
   add_executable(tcp_server test/samples/server.c)
   TARGET_LINK_LIBRARIES(tcp_server cu_tcp cu_thread)
endif(BUILD_SAMPLES)

This is one way of putting the logic directly into the cmake code.

_________________________________________________________
Mike Jackson                  mike.jackson at bluequartz.net
BlueQuartz Software                    www.bluequartz.net
Principal Software Engineer                  Dayton, Ohio