命令行警告D9002:忽略未知选项'-std=c++11'

In my CMakeList.txt file, I have the following in order to add c++11 supports:

在我CMakeList。在txt文件中，我有以下命令来添加c++11支持:

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

集(CMAKE_CXX_FLAGS " $ { CMAKE_CXX_FLAGS }化c + + 11”)

This works fine under Mac with Xcode. However, I get the following warning message from Visual Studio. Any idea?

这在Mac下很好用Xcode。但是，我从Visual Studio得到以下警告消息。任何想法?

Command line warning D9002: ignoring unknown option '-std=c++0x'

命令行警告D9002:忽略未知选项'-std=c++0x'

Other than the compile warning, the program gets compile and run with no problem. I am using VS2013. If I remove that single "set flag" line, the warning goes away.

除了编译警告之外，程序还可以毫无问题地编译和运行。我用VS2013。如果我删除了那个单一的“设置标志”行，警告就会消失。

1 个解决方案

#1

The -std=c++11 option is for GCC/CLang only, it is not available in Visual Studio. C++ 11 support in Visual Studio should be turned on by default. So, you should use this option for GCC-like compilers only:

std=c++11选项只适用于GCC/CLang，在Visual Studio中是不可用的。默认情况下，在Visual Studio中支持c++ 11。因此，您应该仅为gcc类编译器使用此选项:

if(CMAKE_CXX_COMPILER_ID MATCHES "GNU|Clang")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
endif()

If you are using the latest versions of CMake you might try to use new compiler features mechanism : http://www.cmake.org/cmake/help/v3.1/manual/cmake-compile-features.7.html

如果您使用的是最新版本的CMake，您可能会尝试使用新的编译器特性机制:http://www.cmake.org/cmake/help/v3.1/manual/cmake- compi_features.7.html。