CMake編譯靜態庫

CMake編譯靜態庫

---

準備工做

• 安裝cmake  個人系統是ubuntu16，這一步就不贅述了，apt或者源代碼安裝都沒問題。

• 源代碼  我是想在系統中學習好linux應用層編程，因此我買了Linux/Uinx系統編程手冊。 在學習過程當中發現他的代碼都依賴於做者所寫的幾個頭文件，因此我產生了將其將其編譯成靜態庫的想法，雖然文件很少，可是姑且也算是學習到了一些東西。須要的能夠自行百度搜索下載。  源代碼分佈以下：

  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
  └── 編譯靜態庫.md
  
  2 directories, 11 files

• 編寫CMakeLists

  • lib目錄下的CMakeLists

  CMAKE_MINIMUM_REQUIRED(VERSION 2.8)  
  
  SET(LIB_SRC alt_functions.c error_functions.c get_num.c)  #添加源文件
  
  #添加靜態庫  
  ADD_LIBRARY(tpli_static STATIC ${LIB_SRC})  
  
  #將靜態庫從新命名爲Libtpli
  SET_TARGET_PROPERTIES(tpli_static PROPERTIES OUTPUT_NAME "tpli")

  • 當前目錄下的CMakeLists

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

• 編譯

  cd build/
  cmake ..
  make

  查看結果

  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

  如今生成了靜態庫libtpli.a。

• 測試

  • 準備 新建了一個目錄test，將頭文件加入其中，內容以下

    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（複製文件內容到另外一個文件）:

    /*************************************************************************\
    *                  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
    
    # 添加頭文件目錄
    include_directories(${PROJECT_SOURCE_DIR}/inc )
    
    
    link_libraries(/home/zqh/system_program/build/lib/libtpli.a)#添加靜態庫
    
    add_executable (Tutorial test.c) #建立可執行文件
    
    target_link_libraries(Tutorial /home/zqh/system_program/build/lib/libtpli.a)# 鏈接靜態庫庫

  • 編譯

    cd build/
    cmake ..
    make

  • 運行

    ./Tutorial
    Usage: ./Tutorial old-file new-file
    cat 1.txt
    編譯靜態庫成功
    ./Tutorial 1.txt 2.txt
    cat 2.txt
    編譯靜態庫成功