g++: 错误：unrecognized command line option ‘-std=c++14’解决
g++版本过低
解决

yum install -y centos-release-scl-rh

yum install -y centos-release-scl

安装gcc7

yum install devtoolset-7-gcc.x86_64 && yum install devtoolset-7-gcc-c++.x86_64

--- 启用

scl enable devtoolset-7 bash

--查看

g++ --version