CMake 笔记 | [25] 构建时为特定目标运行自定义命令

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.
├── CMakeLists.txt
├── generate_config.cmake
└── main.cpp

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cmake_minimum_required(VERSION 3.10)

project(test_command)

# 设置需要生成的头文件的路径
set(CONFIG_HEADER ${CMAKE_BINARY_DIR}/config.h)

# 添加一个自定义命令来生成头文件
add_custom_command(
    OUTPUT ${CONFIG_HEADER}
    COMMAND ${CMAKE_COMMAND}
        -DOUTPUT_FILE=${CONFIG_HEADER}
        -P ${CMAKE_CURRENT_SOURCE_DIR}/generate_config.cmake
    COMMENT "Generating config.h"
)

# 将生成的头文件的路径添加到包含目录
include_directories(${CMAKE_BINARY_DIR})

# 添加可执行文件
add_executable(test_app main.cpp)

# 将自定义命令的输出文件添加为依赖项
add_dependencies(test_app config_h_target)

# 定义一个自定义目标以便其他目标可以依赖它
add_custom_target(config_h_target DEPENDS ${CONFIG_HEADER})

# 将自定义目标添加到 ALL 阶段，以确保在每次构建时都生成 config.h
add_dependencies(test_app config_h_target)

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# 你可以在这里定义所需的宏
set(APP_NAME "TJUApp")
set(APP_VERSION "1.0.0")
set(DEBUG_MODE 1)

# 生成 config.h 头文件
file(WRITE ${OUTPUT_FILE} "#ifndef CONFIG_H\n")
file(APPEND ${OUTPUT_FILE} "#define CONFIG_H\n")
file(APPEND ${OUTPUT_FILE} "\n")

# 添加宏定义
file(APPEND ${OUTPUT_FILE} "#define APP_NAME \"${APP_NAME}\"\n")
file(APPEND ${OUTPUT_FILE} "#define APP_VERSION \"${APP_VERSION}\"\n")

if (DEBUG_MODE)
    file(APPEND ${OUTPUT_FILE} "#define DEBUG_MODE 1\n")
else ()
    file(APPEND ${OUTPUT_FILE} "#define DEBUG_MODE 0\n")
endif ()

# 结束文件
file(APPEND ${OUTPUT_FILE} "\n#endif\n")
#include <iostream>
#include "config.h"
int main() {
#ifdef DEBUG_MODE
  std::cout << "DEBUG_MODE: " << DEBUG_MODE << std::endl;
#endif
  return 0;
}

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mkdir build & cd build
cmake ..
make