问题
I'm used to install packages on Debian/Ubuntu distributions, but now I need to install gcc and g++ version 8.*. There is only version 4.* in CentOS repositories. What's the correct way to install them manually?
回答1:
CentOS 8 already comes with GCC 8.
On CentOS 7, you can install GCC 8 from Developer Toolset. First you need to enable the Software Collections repository:
yum install centos-release-scl
Then you can install GCC 8 and its C++ compiler:
yum install devtoolset-8-gcc devtoolset-8-gcc-c++
To switch to a shell which defaults gcc and g++ to this GCC version, use:
scl enable devtoolset-8 -- bash
You need to wrap all commands under the scl call, so that the process environment changes performed by this command affect all subshells. For example, you could use the scl command to invoke a shell script that performs the required actions.
回答2:
Permanently adding DTS to your development environment
After installing the devtoolset:
yum install devtoolset-8-gcc devtoolset-8-gcc-c++
You can also use the following command, to make DTS the default:
source scl_source enable devtoolset-8
The benefit of this command is that it can be added to .bashrc, so that you don't have to run the scl command every time you login:
scl enable devtoolset-8 -- bash
来源：https://stackoverflow.com/questions/55345373/how-to-install-gcc-g-8-on-centos