c++ - 如何为忘记的返回语句打开 gcc 警告？

Question

如何为忘记的返回语句打开 gcc 警告？

它应该在以下情况下警告我:

int foo() {
  std::cout << "haha";
}

我知道 -Wall 会打开该警告，但它会启用太多其他警告。

Answer 1

根据 gcc 的 online documentation , -Wall 打开:

      -Waddress   
      -Warray-bounds (only with -O2)  
      -Wc++0x-compat  
      -Wchar-subscripts  
      -Wenum-compare (in C/Objc; this is on by default in C++) 
      -Wimplicit-int (C and Objective-C only) 
      -Wimplicit-function-declaration (C and Objective-C only) 
      -Wcomment  
      -Wformat   
      -Wmain (only for C/ObjC and unless -ffreestanding)  
      -Wmissing-braces  
      -Wnonnull  
      -Wparentheses  
      -Wpointer-sign  
      -Wreorder   
      -Wreturn-type  
      -Wsequence-point  
      -Wsign-compare (only in C++)  
      -Wstrict-aliasing  
      -Wstrict-overflow=1  
      -Wswitch  
      -Wtrigraphs  
      -Wuninitialized  
      -Wunknown-pragmas  
      -Wunused-function  
      -Wunused-label     
      -Wunused-value     
      -Wunused-variable  
      -Wvolatile-register-var 

其中，-Wreturn-type 似乎可以解决问题:

Warn whenever a function is defined with a return-type that defaults to int. Also warn about any return statement with no return-value in a function whose return-type is not void (falling off the end of the function body is considered returning without a value), and about a return statement with an expression in a function whose return-type is void.

但是，如果打开 -Wall 使您的代码有太多警告，我建议您修复您的代码!