因为centos默认安装的gcc是GCC 4.*.* 是不支持 C++11 的，所以有些新的程序或软件要安装就行要升级GCC，否则无法编译通过
一、如下步骤安装不成功（yum install devtoolset-4），基本上是因为仓库不提供相应版本，请先执行yum search devtoolset查询一下
gcc 4.8 安装
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[root@DS-VM-Node239 ~]# curl -Lks http://www.hop5.in/yum/el6/hop5.repo > /etc/yum.repos.d/hop5.repo
[root@DS-VM-Node239 ~]# yum install gcc gcc-g++ -y
[root@DS-VM-Node239 ~]# gcc --version
gcc (GCC) 4.8.2 20131212 (Red Hat 4.8.2-8)
Copyright © 2013 Free Software Foundation, Inc.本程序是*软件；请参看源代码的版权声明。本软件没有任何担保；包括没有适销性和某一专用目的下的适用性担保。[root@DS-VM-Node239 ~]# g++ --version
g++ (GCC) 4.8.2 20131212 (Red Hat 4.8.2-8)Copyright © 2013 Free Software Foundation, Inc.本程序是*软件；请参看源代码的版权声明。本软件没有任何担保；包括没有适销性和某一专用目的下的适用性担保。[root@DS-VM-Node211 ~]#
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gcc 4.9 安装
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[root@DS-VM-Node239 ~]# yum install centos-release-scl -y
[root@DS-VM-Node239 ~]# yum install devtoolset-3-toolchain -y
[root@DS-VM-Node239 ~]# scl enable devtoolset-3 bash
[root@DS-VM-Node239 ~]# gcc --version
gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)
Copyright (C) 2014 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[root@DS-VM-Node239 ~]# g++ --version
g++ (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)Copyright (C) 2014 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[root@DS-VM-Node239 ~]# gfortran --version
GNU Fortran (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)Copyright (C) 2014 Free Software Foundation, Inc.GNU Fortran comes with NO WARRANTY, to the extent permitted by law.You may redistribute copies of GNU Fortranunder the terms of the GNU General Public License.For more information about these matters, see the file named COPYING
[root@DS-VM-Node239 ~]#
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gcc 5.2 安装
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[root@DS-VM-Node239 ~]# yum install centos-release-scl -y
[root@DS-VM-Node239 ~]# yum install devtoolset-4-toolchain -y
[root@DS-VM-Node239 ~]# scl enable devtoolset-4 bash
[root@DS-VM-Node239 ~]# gcc --version
gcc (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)
Copyright (C) 2015 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[root@DS-VM-Node239 ~]# g++ --version
g++ (GCC) 5.2.1 20150902 (Red Hat 5.2.1-2)Copyright (C) 2015 Free Software Foundation, Inc.This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
[root@DS-VM-Node239 ~]#
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二、使用新的办法
yum -y install centos-release-scl-rh centos-release-scl
参考 https://linux.cn/article-8509-1.html?utm_source=weibo&utm_medium=weibo
三、重新指向国内的源头
参考 https://blog.csdn.net/tao_627/article/details/77260963
四、添加源并安装
rpm --import http://linuxsoft.cern.ch/cern/slc68/x86_64/RPM-GPG-KEY-cern \
wget -O /etc/yum.repos.d/slc6-devtoolset.repo http://linuxsoft.cern.ch/cern/devtoolset/slc6-devtoolset.repo \
yum search devtoolset
参考 https://www.aliyun.com/jiaocheng/1389684.html