如何使用clang ++与-std = c ++ 11 -Weverything -Werror [英] How to use clang++ with -std=c++11 -Weverything -Werror

问题描述

我要编译以下文件（temp.cpp）：

  #include< iostream& 
 
 class Foo {
 public：
 Foo（）= default; 
}; 
 
 int main（）{
 std :: cout< 作品！ << std :: endl; 
 return 0; 
} 
  

使用以下命令： clang ++ temp.cpp - o temp -std = c ++ 11 -Weverything -Werror

有一个错误：

temp.cpp：5：11：error：defaulted函数定义与C ++ 98不兼容[-Werror，-Wc ++ 98-compat]

我知道有一个像c ++ 98-compat这样的警告，它是一切的一部分。如何启用除c ++ 98-compat之外的所有警告？有没有一个c ++ 11兼容标志为-Weverything？

解决方案

实际上，你可能不需要所有的警告，因为一些警告可以被认为是风格或主观的，而其他（例如你碰到的）只是愚蠢的你的情况。

-Weverything 最初是由于两个原因构建的：

• 发现： c $ c>你樱桃挑选你不想申请的;优点是当转换到新版本的编译器时，您更有可能从新的警告中受益。

显然，是不是真的兼容生产使用;因此您似乎属于黑名单。

Clang诊断系统将输出最默认的警告名称负责生成警告（ -Wc ++ 98-compat ）的每个警告组，并且可以通过添加 no-

因此，对于黑名单，您可以： p>

  -Weverything -Wno-c ++ 98-compat -Wno -... 
  
 
 
 
我们鼓励您不时修改列入黑名单的警告列表（例如，升级到较新的编译器时）。
 
I want to compile the following file (temp.cpp):
#include <iostream> 

class Foo {
public:
  Foo() = default;
};

int main(){
  std::cout << "Works!" << std::endl;
  return 0;
}
With the following command: clang++ temp.cpp -o temp -std=c++11 -Weverything -Werror

There is an error:

  
temp.cpp:5:11: error: defaulted function definitions are incompatible with C++98 [-Werror,-Wc++98-compat]
I understand that there is a warning like c++98-compat and it is part of everything. How can I enable all warnings except c++98-compat? Is there a c++11 compatible flag for -Weverything?
解决方案
Actually, you probably do not want all the warnings, because a number of warnings can be considered as being stylistic or subjective and others (such as the one you ran afoul of) are just stupid in your situation.

-Weverything was initially built for two reasons:


discovery: it's pretty hard otherwise to get a list of all available warnings
black-listing alternative: with gcc, you cherry pick the warnings you wish to apply (white-listing), with -Weverything you cherry pick those you do not wish to apply; the advantage is that when moving over to a new version of the compiler, you are more likely to benefit from new warnings


Obviously, discovery is not really compatible with production use; therefore you seem to fall in the black-listing case.

Clang diagnostics system will output (by default) the name of the most specific warning group that is responsible for generating a warning (here -Wc++98-compat) and each warning group can be turned off by adding no- right after the -W.

Therefore, for blacklisting, you get:
-Weverything -Wno-c++98-compat -Wno-...
And you are encouraged to revise the list of blacklisted warnings from time to time (for example, when you upgrade to a newer compiler).

                        
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