[CMake] Usage of add_library(... IMPORTED)

[Stefan Reuschl]

Hi list,

a question about using IMPORTED library targets:
The documentation says
> It may be referenced like any target built within the project.
Which would sound nice without the exception in the previous sentence:
> The target name has scope in the directory in which it is created and  
> below.
This is contrary to libraries build using add_library(). Is there a reason  
for this?

I'm searching of the best way to use a library which was imported in a  
subdirectory...
Do I have to use a ProjectConfig.cmake file to find the imported library,  
i.e. import it in the ProjectConfig.cmake file?

To make it more complicated: What to do if add_custom_command() was used  
in a subdirectory to create the library?

Thanks for any hints!
Regards,
   Stefan