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博客园 - Jans

Flutter运行时闪退 利用 Python 爬虫来对文本进行批量化翻译 Thinkpad T460声音问题 Error 56: The Cisco Systems, Inc. VPN Service has not been started(Cisco VPN在Vista/Win 7下出现Error 56的解决办法) - Jans Weblogic中配置Active Directory Authentication Provider weblogic 10.3.5重置密码 在基于WCF开发的Web Service导出WSDL定义问题及自定义wsdl:port 名称 JNI:在线程或信号处理函数中访问自定义类 (转)Java实现Web Service过程中处理SOAP Header的问题 Geek to Live: Set up your personal Wikipedia (转)GitHub上整理的一些工具,求补充 - (转)老衣的开发工具和类库集之2014版 如何删除Weblogic域 电蚊拍选购参考 Localizing WPF with .resx files C#操作串口总结 ASP.NET MVC的国际化问题 小众的分布式版本管理工具Code Co-op 关于效率长尾现象
GCC的内存边界对齐
Jans · 2015-01-19 · via 博客园 - Jans

  GCC有三种影响内存对齐的开关:

          首先是命令行参数 –fpack_struct=n (n只可以是1,2,4,8等2的幂,而且要小于平台默认的对齐字节数,否则不会生效)

          其次是#pragma pack(n) (取值同上述一样,否则也不会生效,而且不怎么会有提示,编译器会有警告)

          最有效的则是 __attribute__((aligned(n)))  这个n也是2的幂,但是没有平台的约束限制