# Everything in C is undefined behavior

> ???[HackerNews](https://blog.habets.se/2026/05/Everything-in-C-is-undefined-behavior.html)

> ??????? 2026-06-14 ????????? `blogs.json` ??????????????????????????? Markdown ???????????????????????????????????????????????

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C语言标准中"未定义行为"(UB)的边界远比开发者想象的模糊。本文深入剖析了那些看似无害却触发UB的常见代码模式——从有符号整数溢出到严格别名违规，揭示编译器如何利用UB进行激进优化。理解这些暗礁不仅能避免诡异的生产环境bug，更能帮助开发者写出真正可移植、可预测的高性能C代码，是系统编程人员的必读警示。

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- ???2026-05-20
- ???技术资讯
- ???HackerNews, 技术资讯
- ?????HackerNews
- ?????https://blog.habets.se/2026/05/Everything-in-C-is-undefined-behavior.html

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