feat: add version header

CMakeLists.txt

@@ -2,21 +2,20 @@ cmake_minimum_required(VERSION 3.20)
 
 project(
   hello
-  VERSION 0.1
+  VERSION 0.1.0
   LANGUAGES CXX)
 
-set(SOURCES src/main.cpp)
-
-set(CMAKE_CXX_STANDARD 20)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
-
-set(CMAKE_EXPORT_COMPILE_COMMANDS
-    ON
-    CACHE INTERNAL "")
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 
 if(CMAKE_EXPORT_COMPILE_COMMANDS)
   set(CMAKE_CXX_STANDARD_INCLUDE_DIRECTORIES
       ${CMAKE_CXX_IMPLICIT_INCLUDE_DIRECTORIES})
 endif()
 
-add_executable(hello ${SOURCES})
+configure_file("${PROJECT_SOURCE_DIR}/include/version.h.in"
+               "${PROJECT_BINARY_DIR}/include/version.h")
+
+add_executable(hello src/main.cpp)
+target_compile_features(hello PUBLIC cxx_std_20)
+
+target_include_directories(hello PRIVATE "${PROJECT_BINARY_DIR}/include")

include/version.h.in

@@ -0,0 +1,8 @@
+#pragma once
+
+#define VERSION_MAJOR @PROJECT_VERSION_MAJOR@
+#define VERSION_MINOR @PROJECT_VERSION_MINOR@
+#define VERSION_PATCH @PROJECT_VERSION_PATCH@
+#define VERSION_TWEAK @PROJECT_VERSION_TWEAK@
+
+#define VERSION "@PROJECT_VERSION@"

src/main.cpp

@@ -1,6 +1,10 @@
+#include <cstdlib>
 #include <iostream>
 
+#include "version.h"
+
 int main(int argc, char **argv) {
-  std::cout << "Hello" << std::endl;
-  return 0;
+  std::cout << "Hello, world! Version " << VERSION << std::endl;
+
+  return EXIT_SUCCESS;
 }