CMake入门-03-还是HelloWorld

  • 2019 年 10 月 3 日
  • 筆記

工作环境

  • 系统：macOS Mojave 10.14.6
  • CMake: Version 3.15.0-rc4

Hello,World! 扩展-math 目录里的文件编译成静态库再由 main 函数调用

(0) 初始化项目

$ mkdir hello  $ cd hello  $ mkdir math build  $ touch CMakeLists.txt main.cpp math/MathFunctions.h math/MathFunctions.cpp math/CMakeLists.txt  $ tree  .  ├── build  ├── CMakeLists.txt  ├── main.cpp  └── math      ├── CMakeLists.txt      ├── MathFunctions.cpp      └── MathFunctions.h

(1) 准备测试代码 main.cpp、math/MathFunctions.h、math/MathFunctions.cpp

  • math/MathFunctions.h
int power(int base, int exponent);
  • math/MathFunctions.cpp
#include <stdio.h>  #include <stdlib.h>  #include "MathFunctions.h"    int power(int base, int exponent) {      int result = base;      int i;        if (exponent == 0) {          return 1;      }        for(i = 1; i < exponent; ++i){          result = result * base;      }      return result;  }
  • main.cpp
#include <iostream>  #include "MathFunctions.h"    using namespace std;    int main(int argc, char const *argv[]) {    /* code */    // cout << "Hello,World!" << power(2, 3) << endl;    printf("%s power(2,3)=%d n", "Hello,World!", power(2, 3));    return 0;  }

(2) 准备 CMakeLists.txt math/CMakeLists.txt

  • CMakeLists.txt
# CMake 最低版本号要求  cmake_minimum_required(VERSION 3.15.0)    # 项目名  project(hello)    # 查找当前目录下的所有源文件，并将名称保存到 SRC_LIST 变量  aux_source_directory(. SRC_LIST)  # 查找 math 目录下的所有源文件，并将名称保存到 MATH_SRC_LIST 变量  # aux_source_directory(${PROJECT_SOURCE_DIR}/math MATH_SRC_LIST)    # 添加 math 子目录 (math 目录里必须有 CMakeLists.txt)，这样 math 目录下的 CMakeLists.txt 文件和源代码也会被处理  add_subdirectory(math)    # 添加头文件路径  include_directories(${PROJECT_SOURCE_DIR}/math)    # 指定生成目标  add_executable(hello ${SRC_LIST} ${MATH_SRC_LIST})    # 添加链接库  target_link_libraries(hello MathFunctions)
  • math/CMakeLists.txt
# 查找当前目录下的所有源文件，并将名称保存到 DIR_LIB_SRCS 变量  aux_source_directory(. DIR_LIB_SRCS)    # 生成链接库  add_library (MathFunctions ${DIR_LIB_SRCS})

(3) 编译运行

$ cd hello/build  $ cmake ..  -- The C compiler identification is AppleClang 10.0.1.10010046  -- The CXX compiler identification is AppleClang 10.0.1.10010046  -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc  -- Check for working C compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/cc -- works  -- Detecting C compiler ABI info  -- Detecting C compiler ABI info - done  -- Detecting C compile features  -- Detecting C compile features - done  -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++  -- Check for working CXX compiler: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -- works  -- Detecting CXX compiler ABI info  -- Detecting CXX compiler ABI info - done  -- Detecting CXX compile features  -- Detecting CXX compile features - done  -- Configuring done  -- Generating done  -- Build files have been written to: /Users/staff/Desktop/hello/build    $ make  Scanning dependencies of target MathFunctions  [ 25%] Building CXX object math/CMakeFiles/MathFunctions.dir/MathFunctions.cpp.o  [ 50%] Linking CXX static library libMathFunctions.a  [ 50%] Built target MathFunctions  Scanning dependencies of target hello  [ 75%] Building CXX object CMakeFiles/hello.dir/main.cpp.o  [100%] Linking CXX executable hello  [100%] Built target hello    $ ./hello  Hello,World! power(2,3)=8

相关参考：
CMake 官方网站
CMake 入门实战

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