[CMake] Cannot add target-level dependencies to non-existent target

[Stephen Kelly]

Glenn Coombs wrote:

> I am getting the error in the subject.  The code I have looks like this:
> 
>     if (PRE_COMPILED_HEADERS_FOUND)
>         ADD_PRECOMPILED_HEADER(${header_pch} ${source_pch} sources
>         systemc)
>     endif()
> 
>     add_library(systemc ${sources} ${sources_no_pch} ${headers})
> 

Use target_sources after the target is created.

 add_library(systemc ${sources} ${headers})
 if (PRE_COMPILED_HEADERS_FOUND)
   ADD_PRECOMPILED_HEADER(${header_pch} ${source_pch} pch_files systemc)
   target_sources(systemc PRIVATE ${pch_files})
 endif()

Thanks,

Steve.