[CMake] Sharing objects between executables

[pellegrini]

Hi all,

I would need your advise about the strategy to adopt when two 
executables share common object files.

Here is the context. I have a project that consists in a program (e.g. 
console_prog) that was historically a console program
on top of which a GUI (gui_prog) was built. The gui_prog calling 
directly the console program via an input file generated by the GUI.

As the gui by itself does not mean anything without its console partner, 
I built a CMakeLists.tx file that contains two add_executables:

    - add_executable(console_prog console_prog.f90 module1.f90 
module2.f90 module3.f90 ...)
    - add_executable(gui_prog gui_prog.f90 module1.f90  module2.f90)

My problem is that gui_prog uses some routines included in the source 
files of the console program (e.g. module1.f90 module2.f90).
I would like to avoid a double build of module1.f90, module2.f90

I see two possibilities:
    - building a static libraries out of the common files and linking it 
to both console_prog and gui_prog executables
    - using the set_source_files_properties command on the objects files 
generated by pfind build with GENERATED option set to true.

Which approach do you think suit the best to my purpose ? If this is the 
second one: is there an easy way to get/specify the list of the
object files generated during the pfind build ?

thanks a lot

Eric

-- 
Eric Pellegrini
Calcul Scientifique
Institut Laue-Langevin
Grenoble, France