Tests/RunCMake/ObjectLibrary/PreLink.cmake - third_party/github.com/Kitware/CMake - Git at Google

 add_library(A OBJECT a.c)
 add_custom_command(TARGET A PRE_LINK
   COMMAND  ${CMAKE_COMMAND} -E echo "A pre-link"
   )
	add_library(A OBJECT a.c)
	add_custom_command(TARGET A PRE_LINK
	COMMAND ${CMAKE_COMMAND} -E echo "A pre-link"
	)