CMake compile static library

# CMake compile static library

Ready to work

• To install cmake
   , my system is ubuntu16. I won't go into details in this step. There is no problem with apt or source code installation.

• Source code
   I want to learn linux application layer programming in the system, so I bought the Linux/Uinx system programming manual .
  In the process of learning, I found that his code depends on several header files written by the author, so I came up with the idea of ​​compiling it into a static library. Although there are not many files, it can be regarded as learning something. If you need it, you can search and download it by yourself.
   The source code distribution is as follows:

  zqh@linux:~/system_program$ tree .
  .
  ├── build
  ├── CMakeLists.txt
  ├── lib
  │   ├── alt_functions.c
  │   ├── alt_functions.h
  │   ├── CMakeLists.txt
  │   ├── ename.c.inc
  │   ├── error_functions.c
  │   ├── error_functions.h
  │   ├── get_num.c
  │   ├── get_num.h
  │   └── tlpi_hdr.h
  └── 编译静态库.md
  
  2 directories, 11 files

• Writing CMakeLists
  • CMakeLists in the lib directory

  CMAKE_MINIMUM_REQUIRED(VERSION 2.8)  
  
  SET(LIB_SRC alt_functions.c error_functions.c get_num.c)  #添加源文件
  
  #添加静态库  
  ADD_LIBRARY(tpli_static STATIC ${LIB_SRC})  
  
  #将静态库重新命名为Libtpli
  SET_TARGET_PROPERTIES(tpli_static PROPERTIES OUTPUT_NAME "tpli")

  • CMakeLists in the current directory

  CMAKE_MINIMUM_REQUIRED(VERSION 2.8)  
  PROJECT(TestLIB)  #工程名
  ADD_SUBDIRECTORY(lib) #添加子目录

• compile

  cd build/
  cmake ..
  make

  View Results

  zqh@linux:~/system_program/build$ ls
  CMakeCache.txt  CMakeFiles  cmake_install.cmake  lib  Makefile
  zqh@linux:~/system_program/build$ cd lib/
  zqh@linux:~/system_program/build/lib$ ls
  CMakeFiles  cmake_install.cmake  libtpli.a  Makefile

  The static library libtpli.a is now generated.
• test

  • Preparation
    Create a new directory test, add the header file to it, the content is as follows

    zqh@linux:~/system_program/test$ tree
    .
    ├── build
    ├── CMakeLists.txt
    ├── inc
    │   ├── alt_functions.h
    │   ├── ename.c.inc
    │   ├── error_functions.h
    │   ├── get_num.h
    │   └── tlpi_hdr.h
    └── test.c
    
    2 directories, 7 files

    test.c (copy file content to another file):

        /*************************************************************************\
    *                  Copyright (C) Michael Kerrisk, 2017.                   *
    *                                                                         *
    * This program is free software. You may use, modify, and redistribute it *
    * under the terms of the GNU General Public License as published by the   *
    * Free Software Foundation, either version 3 or (at your option) any      *
    * later version. This program is distributed without any warranty.  See   *
    * the file COPYING.gpl-v3 for details.                                    *
    \*************************************************************************/
    
    /* Listing 4-1 */
    
    /* copy.c
    
    Copy the file named argv[1] to a new file named in argv[2].
    */
    #include <sys/stat.h>
    #include <fcntl.h>
    #include "tlpi_hdr.h"
    
    #ifndef BUF_SIZE        /* Allow "cc -D" to override definition */
    #define BUF_SIZE 1024
    #endif
    
    int
    main(int argc, char *argv[])
    {
        int inputFd, outputFd, openFlags;
        mode_t filePerms;
        ssize_t numRead;
        char buf[BUF_SIZE];
    
        if (argc != 3 || strcmp(argv[1], "--help") == 0)
            usageErr("%s old-file new-file\n", argv[0]);
    
        /* Open input and output files */
    
        inputFd = open(argv[1], O_RDONLY);
        if (inputFd == -1)
            errExit("opening file %s", argv[1]);
    
        openFlags = O_CREAT | O_WRONLY | O_TRUNC;
        filePerms = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP |
                    S_IROTH | S_IWOTH;      /* rw-rw-rw- */
        outputFd = open(argv[2], openFlags, filePerms);
        if (outputFd == -1)
            errExit("opening file %s", argv[2]);
    
        /* Transfer data until we encounter end of input or an error */
    
        while ((numRead = read(inputFd, buf, BUF_SIZE)) > 0)
            if (write(outputFd, buf, numRead) != numRead)
                fatal("couldn't write whole buffer");
        if (numRead == -1)
            errExit("read");
    
        if (close(inputFd) == -1)
            errExit("close input");
        if (close(outputFd) == -1)
            errExit("close output");
    
        exit(EXIT_SUCCESS);
    }

    CMakeLists.txt:

    CMAKE_MINIMUM_REQUIRED(VERSION 2.8)  
    project (Tutorial)  #工程名
    
    # 添加头文件目录
    include_directories(${PROJECT_SOURCE_DIR}/inc )
    
    
    link_libraries(/home/zqh/system_program/build/lib/libtpli.a)#添加静态库
    
    add_executable (Tutorial test.c) #创建可执行文件
    
    target_link_libraries(Tutorial /home/zqh/system_program/build/lib/libtpli.a)# 连接静态库库

  • compile

    cd build/
    cmake ..
    make

  • run

    ./Tutorial
    Usage: ./Tutorial old-file new-file
    cat 1.txt
    编译静态库成功
    ./Tutorial 1.txt 2.txt
    cat 2.txt
    编译静态库成功