如何激活C ++ 11在CMake？ [英] How to activate C++ 11 in CMake?

问题描述

当我尝试运行CMake生成makefile来编译我的程序时，我得到的错误是

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

在C ++ 98模式。

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

我尝试添加 add_definitions（-std = c ++ 0x）我的 CMakeLists.txt ，但它没有帮助。
我也尝试过：

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

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

当我做 g ++ --version ，我获得：

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

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

我也试过了 SET（CMAKE_CXX_FLAGS-std = c ++ 0x） ，这也不工作。

I have also tried SET(CMAKE_CXX_FLAGS "-std=c++0x"), which also does not work.

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）会激活许多C ++ 11功能。它不工作的原因是该语句看起来像这样：

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")

-std = c ++ 0x 标志被覆盖，它没有工作。

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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