[CMake] Running external programs

[Mika.Rajala at patria.fi]

Hi

I need to generate a license file for my application and install it with
the NSIS package generated.

To generate it I need to run a program with various command line arguments,
one of which is a path to the compiled executable.

<MetaCode>

add_executable(MyApp .....)

execute_process(LicenseApp "-f MyApp")

install(MyApp)
install(${Path_to_license_file_generated_by_LicenseApp})

</MetaCode>

How do i do that?

The problem i have is that i need the MyApp target to be compiled before
calling the execute_process.

Is there a way i can do this with CMake?

-mika