How to do it

Let us build a corresponding CMakeLists.txt instance, which will enable us to conditionally compile the source code based on the target OS:

  1. We first set the minimum CMake version, project name, and supported language:
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)project(recipe-02 LANGUAGES CXX)
  1. Then we define the executable and its corresponding source file:
add_executable(hello-world hello-world.cpp)
  1. Then we let the preprocessor know the system name by defining the following target compile definitions:
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")  target_compile_definitions(hello-world PUBLIC "IS_LINUX")endif()if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")  target_compile_definitions(hello-world PUBLIC "IS_MACOS")endif()if(CMAKE_SYSTEM_NAME ...

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