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https://asplos.dev/wordpress/2019/02/09/linux%e7%bc%96%e8%af%91%e5%87%ba%e7%8e%b0-text0x20%ef%bc%9a%e5%af%b9main%e6%9c%aa%e5%ae%9a%e4%b9%89%e7%9a%84%e5%bc%95%e7%94%a8-collect2-%e9%94%99%e8%af%af%ef%bc%9ald-%e8%bf%94/
linux编译出现 (.text+0x20)：对‘main’未定义的引用 collect2: 错误：ld 返回 1 | (.text+0x20): undefined reference to `main' and undefined reference to function 解决方法
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