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 ...
