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Posted to dev@brpc.apache.org by GitBox <gi...@apache.org> on 2022/02/15 08:38:13 UTC

[GitHub] [incubator-brpc] TousakaRin commented on issue #1693: compile failed with error "error: macro "__has_attribute" requires an identifier"

TousakaRin commented on issue #1693:
URL: https://github.com/apache/incubator-brpc/issues/1693#issuecomment-1040001492


   谢谢反馈，该问题是因为在编译时指定了选项 -D__const__= 导致的，brpc在编译时需要添加这个宏来避免gcc对errno宏做优化从而[导致未定义行为](https://github.com/apache/incubator-brpc/blob/master/docs/cn/thread_local.md#gcc4%E4%B8%8B%E7%9A%84errno%E9%97%AE%E9%A2%98)
   
   你的系统文件（/usr/include/x86_64-linux-gnu/sys/cdefs.h） 在 #if 中测试了 `__glibc_has_attribute (__const__)`，这个宏展开之后是` __has_attribute (__const__)`,  由于brpc在编译时将 __const__ 定义成了空，所以报错了。比较快的解决方案是直接删掉后边的 `__glibc_has_attribute (__const__)`  
   
   ps：提issue的时候可以预览一下，编译错误里的`__const__`变成了加粗的 __const__ 了
   


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