如何在clang ++中禁止显示警告? [英] How to suppress a warning in clang++?

问题描述

我编译了以下c ++程序:

I compiled the following c++ program:

 int main() {  2==3;  }

具有:

clang++-5.0 -std=c++17 -Wunused-comparison prog.cpp

并得到警告:

warning: equality comparison result unused [-Wunused-comparison]
2==3;
~^~~

...因此，这可能不是抑制CLANG中警告的正确方法.

... so, probably this is not the correct way to suppress a warning in CLANG.

在 clang手册，这部分是待办事项".

In the clang manual, this part is a "TODO".

禁用警告的正确命令行标志是什么?

What is the correct command-line flag to disable a warning?

推荐答案

在从中获得的clang诊断程序中:

In the clang diagnostic that you get from:

$ cat main.cpp
int main()
{
    2==3;
    return 0;
}

$ clang++ -c main.cpp
main.cpp:3:6: warning: equality comparison result unused [-Wunused-comparison]
    2==3;
    ~^~~
1 warning generated.

方括号:

-Wunused-comparison

告诉您 -Wunused-comparison 是负责诊断的已启用警告(在本例中为默认启用).因此，要取消诊断，您可以使用匹配的 -Wno -... 标志显式禁用该警告:

tells you that -Wunused-comparison is the enabled warning (in this case enabled by default) that was responsible for the diagnostic. So to suppress the diagnostic you explicitly disable that warning with the matching -Wno-... flag:

$ clang++ -c -Wno-unused-comparison main.cpp; echo Done
Done

GCC也是如此.

通常，禁止警告是鲁re的.宁可慷慨地启用它们- -Wall -Wextra [-pedantic] -然后修复有问题的代码.

In general, it is reckless to suppress warnings. One should rather enable them generously - -Wall -Wextra [-pedantic] - and then fix offending code.

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