CMake编译静态库

# CMake编译静态库

准备工作

安装cmake
我的系统是ubuntu16，这一步就不赘述了，apt或者源代码安装都没问题。

源代码
我是想在系统中学习好linux应用层编程，所以我买了Linux/Uinx系统编程手册。
在学习过程中发现他的代码都依赖于作者所写的几个头文件，所以我产生了将其将其编译成静态库的想法，虽然文件不多，但是姑且也算是学习到了一些东西。需要的可以自行百度搜索下载。
源代码分布如下：

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
└── 编译静态库.md

2 directories, 11 files

编写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")

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

编译

cd build/
cmake ..
make

查看结果

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

现在生成了静态库libtpli.a。

测试

准备
新建了一个目录test，将头文件加入其中，内容如下

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（复制文件内容到另一个文件）:

    /*************************************************************************\
*                  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

编译
```
cd build/
cmake ..
make
```

运行

./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

# CMake编译静态库

准备工作

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