C ++ 11的编译器标志 [英] Compiler flags for C++11

问题描述

我想写一个CMakeFiles.txt（从来没有做过），我不知道什么编译器标志用于C ++ 11。我使用GCC 4.8.2和标志是std = c ++ 0x，但我不知道该怎么做其他编译器。我不认为他们都使用那个标志，我相信MinGW-TDM使用std = c + + 11，什么正确的方式来确保编译器使用c ++ 11？

这里是一个示例代码：

 ＃test for C ++ 11 flags 
 include（TestCXXAcceptsFlag）
 
 if（NOT DISABLE_GXX0XCHECK）
＃尝试使用编译器标志-std = c ++ 11 
 check_cxx_accepts_flag（ -  std = c ++ 11CXX_FLAG_CXX11）
 endif（NOT DISABLE_GXX0XCHECK）
 
 if（CXX_FLAG_CXX11）
 [add flag -std = c ++ 11 where needed] 
 else（）
 if（NOT DISABLE_GXX0XCHECK） 
＃尝试使用编译器标志-std = c ++ 0x为旧编译器
 check_cxx_accepts_flag（ -  std = c ++ 0xCXX_FLAG_CXX0X）
 endif（NOT DISABLE_GXX0XCHECK）
 if（CXX_FLAG_CXX0X）
 [add flag -std = c ++ 11 where needed] 
 ... 
  

Mabye stackoverflow.com/ q / 10984442 也帮助你。

编辑：我尝试使用Microsoft的Visual C ++，我的解决方案缺陷：编译器发出关于无法识别的标志的警告。这意味着CMake检测到该标志为正确并添加它。因此，每个可执行文件都会收到此警告。添加-Werror，或者Visual C ++的任何标志都应该有帮助。

I'm trying to write a CMakeFiles.txt (never done it before) and I'm not sure what compiler flag to use for C++11. I use GCC 4.8.2 and the flag is std=c++0x but I'm not sure what to do about other compilers. I don't suppose they all use that flag, I believe MinGW-TDM uses std=c++11, what would the correct way to ensure the compiler uses c++11 be?

解决方案

In my project I just try to add -std=c++11 and if that does not work I try -std=c++0x. When both fail, I just leave it alone. For me that works great but I have never tried a Windows compiler. Here an example code:

# test for C++11 flags
include(TestCXXAcceptsFlag)

if(NOT DISABLE_GXX0XCHECK)
  # try to use compiler flag -std=c++11
  check_cxx_accepts_flag("-std=c++11" CXX_FLAG_CXX11)
endif(NOT DISABLE_GXX0XCHECK)

if(CXX_FLAG_CXX11)
  [add flag -std=c++11 where needed]
else()
  if(NOT DISABLE_GXX0XCHECK)
    # try to use compiler flag -std=c++0x for older compilers
    check_cxx_accepts_flag("-std=c++0x" CXX_FLAG_CXX0X)
  endif(NOT DISABLE_GXX0XCHECK)
  if(CXX_FLAG_CXX0X)
    [add flag -std=c++11 where needed]
...

Mabye stackoverflow.com/q/10984442 does help you, too. Erik Sjölund suggest to have a look at CMake nightly build's FindCXXFeatures.cmake.

Edit: I tried this with Microsoft's Visual C++ and my solution has a flaw: The compiler emits a warning about the unrecognized flag. This means CMake detects the flag as correct and adds it. Thus one gets this warning for every executable. Adding -Werror, or whatever the flag for Visual C++ is, should help.

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