how to add prebuilt object files to executable in cmake

Question

I have an add_custom_target that triggers a make for a project (that project does not use cmake!) and generates an object file. I would like to add this object

Answer 1

You can list object files along sources in add_executable() and addlibrary():

add_executable(myProgram
   source.cpp
   object.o
)

The only thing is that you need to use add_custom_command to produce object files, so CMake would know where to get them. This would also make sure your object files are built before myProgram is linked.