linux 程序、动态库、静态库内部添加版本号和编译时间详解
<p>给程序和库添加版本号和库，有利于维护和升级。</p>
<p>
当然你可以在文件名上体现，比如有个程序叫 yun，文件名写为 yun_1.0.2，但这个需要每次手动维护，而且不能100%确保当前程序就是那个版本。所以，把版本号体现在程序内部，是一个不错的选择。</p>
<p>
<span><strong>----------------------------- 我是做法分割线 -------------------------------</strong></span></p>
<p>
<span><strong>一、可执行程序</strong></span></p>
<p>
程序内部定义版本宏，然后 main 函数通过 -v 参数，打印版本号和编译时间，代码如下：</p>
<p>
注：__date__（编译日期）， __time__（编译时间）</p>
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<code class="xhtml plain">#include <</code><code class="xhtml keyword">stdio.h</code><code class="xhtml plain">></code>
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<code class="xhtml plain">#include <</code><code class="xhtml keyword">string.h</code><code class="xhtml plain">></code>
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<code class="xhtml plain">#define version "0.0.2" // 此处每次发布版本要手动更新</code>
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<code class="xhtml plain">#define name "yun"</code>
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<code class="xhtml plain">{</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">if (0 == strcmp("-v", argv))</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf("%s version: %s (%s, %s)\n", name, version, __date__, __time__);</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">else if (0 == strcmp("-h", argv))</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf("usage: %s \n", name);</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf("options:\n");</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf(" void\trun %s\n", name);</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf(" -v\tdisplay %s version information\n", name);</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf(" -h\tdisplay help information\n");</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf("usage: %s [-v | -h]\n", name);</code>
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<code class="xhtml plain">}</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">if (2 == argc)</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">show_info(argv);</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">printf("can you feel me?\n");</code>
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<code class="xhtml spaces"> </code><code class="xhtml plain">return 0;</code>
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<code class="xhtml plain">}</code>
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<p>
<strong>运行效果：</strong></p>
<p>
<img title="linux 程序、动态库、静态库内部添加版本号和编译时间详解" alt="linux 程序、动态库、静态库内部添加版本号和编译时间详解" src="https://zhuji.jb51.net/uploads/img/202305/0b4d2a8499f444eace01204b8af60a5d.jpg"></p>
<p>
<span><strong>二、动态库、静态库</strong></span></p>
<p>
<span>库不采用 -v 这种方法，因为不是可执行程序。</span></p>
<p>
<span>我们可以给程序添加一个版本号字符串，编译成库后使用 strings 命令查看，代码如下：</span></p>
<p>
<span>/* add.h */</span></p>
<pre class="cpp prettyprint linenums" code_snippet_id="593124" name="code" snippet_file_name="blog_20150130_2_1497802">
#ifndef _add_h_#define _add_h_int add(int a, int b);#endif /* _add_h_ */</pre>
<p>
<span><span>/* add.c */</span></span></p>
<pre class="cpp prettyprint linenums" code_snippet_id="593124" name="code" snippet_file_name="blog_20150130_3_2987374">
#include "add.h"// 此处每次发布版本要手动更新const char *lib_info = "libadd version: 0.0.3 (2015-01-30, 08:30)";int add(int a, int b){return (a + b);}</pre>
<p>
<strong>编译及运行结果：</strong></p>
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/* 静态库 */</p>
<p>
<img title="linux 程序、动态库、静态库内部添加版本号和编译时间详解" alt="linux 程序、动态库、静态库内部添加版本号和编译时间详解" src="https://zhuji.jb51.net/uploads/img/202305/715f9a5391656e356795acd042b2a771.jpg"></p>
<p>
<span>/* 动态库 */</span></p>
<p>
<img title="linux 程序、动态库、静态库内部添加版本号和编译时间详解" alt="linux 程序、动态库、静态库内部添加版本号和编译时间详解" src="https://zhuji.jb51.net/uploads/img/202305/9f3af421774de1919ed3dfd6ccf1a869.jpg"></p>
<p>
<strong>说明：</strong></p>
<p>
<span><strong>strings</strong> 命令: 用于显示文件中的可打印字符。</span></p>
<p>
<span><strong>grep</strong>: 用于过滤无用信息，因为自定义的库信息包含 "version"，所以就只显示包含 "version" 的行，否则其他信息太多不好找。</span></p>
<p>
<span>此方法也可适用于<strong>可执行程序</strong>添加版本信息。</span></p>
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