The CXX compiler identification is unknown

1、问题

cmake出现以下错误：

-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is unknown
-- 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
CMake Error at CMakeLists.txt:1 (project):
  No CMAKE_CXX_COMPILER could be found.

  Tell CMake where to find the compiler by setting either the environment
  variable "CXX" or the CMake cache entry CMAKE_CXX_COMPILER to the full path
  to the compiler, or to the compiler name if it is in the PATH.

 

2、分析

出现该错误的原因是因为cmake找不到C++的编译器（比如找不到g++）

 

3、解决

（1）更新软件源

sudo apt-get update

（2）安装build-essential

另：因为gcc不包含g++。可单独安装g++

apt-get install g++

（3）查看g++版本

g++ --version