如何在 CMake 中激活 C++ 11? [英] How do I activate C++ 11 in CMake?

问题描述

当我尝试运行 CMake 生成的 makefile 来编译我的程序时，出现错误

When I try to run a CMake generated makefile to compile my program, I get the error that

C++ 98 模式不支持基于范围的 for 循环.

range based for loops are not supported in C++ 98 mode.

我尝试将 add_definitions(-std=c++0x) 添加到我的 CMakeLists.txt，但没有帮助.

I tried adding add_definitions(-std=c++0x) to my CMakeLists.txt, but it did not help.

我也试过这个:

if(CMAKE_COMPILER_IS_GNUCXX)
    add_definitions(-std=gnu++0x)
endif()

当我执行 g++ --version 时，我得到:

When I do g++ --version, I get:

g++ (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1

g++ (Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1

我也试过SET(CMAKE_CXX_FLAGS "-std=c++0x")，同样不行.

我不明白如何使用 CMake 激活 C++ 11 功能.

I do not understand how I can activate C++ 11 features using CMake.

推荐答案

事实证明，SET(CMAKE_CXX_FLAGS "-std=c++0x") 确实激活了许多 C++11 功能.它不起作用的原因是该语句如下所示:

As it turns out, SET(CMAKE_CXX_FLAGS "-std=c++0x") does activate many C++11 features. The reason it did not work was that the statement looked like this:

set(CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS} -g -ftest-coverage -fprofile-arcs")

按照这种方法，不知何故 -std=c++0x 标志被覆盖，它不起作用.一一设置标志或使用列表方法都有效.

Following this approach, somehow the -std=c++0x flag was overwritten and it did not work. Setting the flags one by one or using a list method is working.

list( APPEND CMAKE_CXX_FLAGS "-std=c++0x ${CMAKE_CXX_FLAGS} -g -ftest-coverage -fprofile-arcs")

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