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CMake无法找到支持C++11的编译器

cmake
3

我正在尝试安装FANN库以用于一个项目中。我正在使用这个作为我的指南，但当我运行cmake .时，我收到了如下提示：

`$ cmake .
-- FANN is used as APPLICATION_NAME
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Could NOT find OpenMP (missing:  OpenMP_CXX_FLAGS) 
-- The compiler /usr/bin/c++ has no C++0x, C++11 or C++14 support. FANN will still work with no problem, but the tests will not be able to compile.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/marvin/fann`

即使我已经安装了gcc/g++ 4.9，但根据Git hub上的说明，运行cmake .时输出应该类似于这样：
`-- The C compiler identification is GNU 4.8.1
-- The CXX compiler identification is GNU 4.8.1
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- FANN is used as APPLICATION_NAME
-- Try OpenMP C flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Try OpenMP CXX flag = [-fopenmp]
-- Performing Test OpenMP_FLAG_DETECTED
-- Performing Test OpenMP_FLAG_DETECTED - Success
-- Found OpenMP: -fopenmp  
-- Found PythonInterp: /home/cobalt/anaconda3/bin/python (found version "3.4.3") 
-- Looking for include file pthread.h
-- Looking for include file pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Performing Test COMPILER_SUPPORTS_CXX14
-- Performing Test COMPILER_SUPPORTS_CXX14 - Success
-- Performing Test COMPILER_SUPPORTS_CXX11
-- Performing Test COMPILER_SUPPORTS_CXX11 - Success
-- Performing Test COMPILER_SUPPORTS_CXX0X
-- Performing Test COMPILER_SUPPORTS_CXX0X - Success
-- The compiler /usr/bin/c++ has C++14 support.
-- Configuring done
-- Generating done
-- Build files have been written to: /home/cobalt/repos/fann`

有需要帮忙的吗？
你正在使用一种古老的编译器（并且看起来不是 g++），它甚至不支持 C++0x 标准。如果你确实已经安装了最新的 g++，那么你需要显式地将其设置为你的 C++ 编译器。 - tchakravarty
嘿，感谢您的快速回复！运行 sudo update-alternatives --config gcc 后，我得到了以下信息：`有 2 个选择可替代 /usr/bin/gcc (提供 /usr/bin/gcc)。

选择 路径 优先级 状态

  • 0 /usr/bin/gcc-4.9 60 自动模式 1 /usr/bin/gcc-4.8 60 手动模式 2 /usr/bin/gcc-4.9 60 手动模式` 我还需要做什么才能将其设置为我的默认编译器？
 - Marvin Limjuco
1
使用cmake -DCMAKE_CXX_FLAGS="-std=c++11" ..来编译程序。也许可以删除CMakeLists.txt文件，这将触发对编译器的新搜索，并得到编译器的输出结果。 - usr1234567
1个回答
2

即使您已安装gcc-4.9，它可能不在标准位置，或者您的环境变量CXX指向另一个编译器/usr/bin/c++。

尝试运行cmake -D CMAKE_CXX_COMPILER /path/to/your/g++-4.9/binary" ..

我得到了一个错误信息：命令行参数解析错误：-D。应该是：VAR:type=value。 - Vitaly Zdanevich
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