配置yum源
$ cat /etc/yum.repos.d/CentOS.repo
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| [centos-sclo-rh]
name=CentOS-6.10 - SCLo rh
baseurl=http://vault.centos.org/centos/6.10/sclo/$basearch/rh/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo
[centos-sclo-sclo]
name=CentOS-6.10 - SCLo sclo
baseurl=http://vault.centos.org/centos/6.10/sclo/$basearch/sclo/
gpgcheck=1
enabled=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-SCLo
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$ yum clean all && yum makecache
toolchain 会自动安装gcc 7和 gcc 8 以及依赖
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| yum install devtoolset-7-toolchain
yum install devtoolset-7-toolchain
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列出所有软件
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| $ scl --list
devtoolset-7
devtoolset-8
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切换软件环境（临时使用gcc7 版本）
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| $ scl enable devtoolset-7 bash
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-7/root/usr/libexec/gcc/x86_64-redhat-linux/7/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-7/root/usr --mandir=/opt/rh/devtoolset-7/root/usr/share/man --infodir=/opt/rh/devtoolset-7/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --enable-plugin --with-linker-hash-style=gnu --enable-initfini-array --with-default-libstdcxx-abi=gcc4-compatible --with-isl=/builddir/build/BUILD/gcc-7.3.1-20180303/obj-x86_64-redhat-linux/isl-install --enable-libmpx --with-mpc=/builddir/build/BUILD/gcc-7.3.1-20180303/obj-x86_64-redhat-linux/mpc-install --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 7.3.1 20180303 (Red Hat 7.3.1-5) (GCC)
$ exit
exit
$ scl enable devtoolset-8 bash
$
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-8/root/usr/libexec/gcc/x86_64-redhat-linux/8/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-8/root/usr --mandir=/opt/rh/devtoolset-8/root/usr/share/man --infodir=/opt/rh/devtoolset-8/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --with-default-libstdcxx-abi=gcc4-compatible --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/isl-install --disable-libmpx --with-mpc=/builddir/build/BUILD/gcc-8.3.1-20190311/obj-x86_64-redhat-linux/mpc-install --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)
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当前bash窗口关闭后 将退出gcc7 环境使用
查看gcc相关路径
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$ find / -name gcc |grep bin
/opt/rh/devtoolset-8/root/usr/bin/gcc
/opt/rh/devtoolset-7/root/usr/bin/gcc
/usr/bin/gcc
$
$ find / -name g++ |grep bin
/opt/rh/devtoolset-8/root/usr/bin/g++
/opt/rh/devtoolset-7/root/usr/bin/g++
/usr/bin/g++
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配置gcc优先级
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| sudo update-alternatives --install /usr/bin/gcc gcc /opt/rh/devtoolset-8/root/usr/bin/gcc 10 --slave /usr/bin/g++ g++ /opt/rh/devtoolset-8/root/usr/bin/g++
sudo update-alternatives --install /usr/bin/gcc gcc /opt/rh/devtoolset-7/root/usr/bin/gcc 20 --slave /usr/bin/g++ g++ /opt/rh/devtoolset-7/root/usr/bin/g++
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100/200为优先级，数字越大优先级越高。
如果 /usr/bin/gcc文件存在需要删除或是重命名.
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| $ mv /usr/bin/gcc /usr/bin/gcc.backup
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查看配置
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| $ sudo update-alternatives --config gcc
There are 2 programs which provide 'gcc'.
Selection Command
-----------------------------------------------
+ 1 /opt/rh/devtoolset-8/root/usr/bin/gcc
* 2 /opt/rh/devtoolset-7/root/usr/bin/gcc
Enter to keep the current selection[+], or type selection number:
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删除 gcc 配置
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| sudo update-alternatives --remove gcc /opt/rh/devtoolset-7/root/usr/bin/gcc
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