[CMake] OBJECT Library Type

[Simone Atzeni]

Hi,

I am trying to merge together two "OBJECT" libraries.
I am following the tutorial at: https://cmake.org/Wiki/CMake/Tutorials/Object_Library

However, in my case I have more level of folder nesting, and at the parent level I would like to merge two "OBJECT" libraries and only at the top I want to create the actual library.

I tried with:

add_library(common OBJECT "$<TARGET_OBJECTS:A> $<TARGET_OBJECTS:B> $<TARGET_OBJECTS:C>")

But I get the following error:

-----------------------------------------------------------------------------------------------------
CMake Error at lib/common/CMakeLists.txt:31 (add_library):
  OBJECT library "common" contains:

    file1.cpp.o
    file2.cpp.o
    file3.cpp.o
    ...

  but may contain only sources that compile, header files, and other files
  that would not affect linking of a normal library.

CMake Error at lib/common/CMakeLists.txt:31 (add_library):
  Only executables and non-OBJECT libraries may reference target objects.

What's the correct way to do this?

Thanks.
Simone


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