CMake Cookbook

There is more

Let us now show the use of the object library functionality made available in CMake. We will use the same source files, but modify CMakeLists.txt:

cmake_minimum_required(VERSION 3.5 FATAL_ERROR)project(recipe-03 LANGUAGES CXX)add_library(message-objs  OBJECT    Message.hpp    Message.cpp  )# this is only needed for older compilers# but doesn't hurt either to have itset_target_properties(message-objs  PROPERTIES    POSITION_INDEPENDENT_CODE 1  )add_library(message-shared  SHARED    $<TARGET_OBJECTS:message-objs>  )add_library(message-static  STATIC    $<TARGET_OBJECTS:message-objs>  )add_executable(hello-world hello-world.cpp)target_link_libraries(hello-world message-static)

First, notice that the add_library command changed to add_library(message-objs ...