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<title>关于带返回值的函数未返回引起的Undefined Behavior问题 | 云海鹰影</title>
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<h1 class="kratos-entry-title text-center">关于带返回值的函数未返回引起的Undefined Behavior问题</h1>
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<i class="fa fa-calendar"></i> 2023-02-24
<i class="fa fa-folder"></i> 分类 <a class="label-link" href="/categories/%E7%BC%96%E7%A8%8B%E5%9F%BA%E7%A1%80/">编程基础</a>, <a class="label-link" href="/categories/%E7%BC%96%E7%A8%8B%E5%9F%BA%E7%A1%80/C-%E5%9F%BA%E7%A1%80/">C++基础</a>
<i class="fa fa-user"></i> 作者 云海鹰影
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本文最后编辑于 <time datetime="1677810868553"></time> 前，其中的内容可能需要更新。
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<p>最近帮一个同事调试代码，遇到一个奇怪的double free崩溃问题，通过gdb定位到问题函数，发现问题出现在一个局部变量的析构函数中，最初没有关注到返回值问题，花了很多时间分析业务代码，结果找不出任何问题; 后来注意到返回值问题，想到gcc没有任何报错（用了-w屏蔽警告）, 而且测试问题函数内业务代码时，有时候也能修复，所以觉得应该与返回值无关，但是顺手修复后，bug就此消失了。后来上网查找了类似原因，原来是编译优化与UB的基础性问题，惭愧。</p>
</blockquote>
<p>知乎讨论帖： <a target="_blank" rel="noopener" href="https://www.zhihu.com/question/472017255">这个代码int函数无返回值且开-O2，for循环会无限循环，是什么原因？</a></p>
<p>后经过测试，对于int函数漏返回值：<br>ubuntu 18.04 gcc 7.5.0 -O2 编译器无警告，运行结果正确，没有触发UB行为<br>ubuntu 20.04 gcc 9.4.0 -O2 -O1 编译器输出警告，运行触发UB行为，比如上面提到的double free或者 带条件for无限循环 等问题</p>
<p>结论： 进行C/C++程序开发时，基础一定要打牢，同时非常有必要关注编译器版本，优化级别以及警告信息，尽量在打开警告(-Wall)时完成编译并认真对待警告。</p>
<h2 id="参考"><a href="#参考" class="headerlink" title="参考"></a>参考</h2><p><a target="_blank" rel="noopener" href="https://en.cppreference.com/w/cpp/language/ub">cppreference UB</a><br><a target="_blank" rel="noopener" href="https://www.cnblogs.com/wangzhiyi/p/10964937.html">C++ 未定义行为</a></p>
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最近帮一个同事调试代码，遇到一个奇怪的double free崩溃问题，通过gdb定位到问题函数，发现问题出现在一个局部变量的析构函数中，最初没有关注到返回值问题，花了很多时间分析业务代码，结果找不出任何问题; 后来注意到返回值问题，...`;
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