升级gcc到7.3版本
sudo yum install centos-release-scl-rh centos-release-scl
sudo yum install devtoolset-7-gcc devtoolset-7-gcc-c ++
source /opt/rh/devtoolset-7/enable
echo "source /opt/rh/devtoolset-7/enable" >> ~/.bashrc
安装Jsoncpp库
sudo yum install epel-release
sudo yum install jsoncpp-devel
