cmake简单入门2

github: https://github.com/ZhouHanyu18/cmake

参考链接：https://blog.csdn.net/lwljava/article/details/38517193?utm_medium=distribute.pc_relevant.none-task-blog-OPENSEARCH-1&depth_1-utm_source=distribute.pc_relevant.none-task-blog-OPENSEARCH-1

一、自定义编译选项demo2

1. CMakeLists.txt

# cmake 最低版本要求
cmake_minimum_required (VERSION 2.8)
# 项目名称
project (Main)

# 是否使用自己的 Tools 库
option (USE_MYMATH "Use provided math implementation" ON)

# 是否加入 MathFunctions 库
if (USE_MYMATH)
  include_directories ("${PROJECT_SOURCE_DIR}")
  add_subdirectory (tools)  
  set (EXTRA_LIBS ${EXTRA_LIBS} Tools)
endif (USE_MYMATH)

#CMake 对源码的设置
configure_file (
  "${PROJECT_SOURCE_DIR}/config.h.in"
  "${PROJECT_BINARY_DIR}/config.h"
)
include_directories ("${PROJECT_BINARY_DIR}")

# 查找当前目录下的所有源文件, 并将名称保存到 DIR_SRCS 变量
aux_source_directory(main/ DIR_SRCS)
# 指定生成目标
add_executable(main ${DIR_SRCS})
# 添加链接库
target_link_libraries(main ${EXTRA_LIBS})

注意：configure_file的设置必须在USE_MYMATH定义之后，否则USE_MYMATH默认为OFF

2. main.cpp

#include 
#include 
#include "config.h"

#ifdef USE_MYMATH
#include "tools/math.h"
#else
#include 
#endif

int main(int argc, char* argv[]) {
    if (argc < 2) {
        printf("please input %s number: \n", argv[0]);
        return 1;
    }
    
    double input = atof(argv[1]);
    int n = atoi(argv[2]);
    double out = pow(input, n);
    
    printf("pow(%f, %d) is %f\n", input, n, out); 
}

包含配置文件的头文件，选择性进行编译

3. 新建build目录进行编译

4. 运行