How to install GNU GCC 8 on CentOS 7

It has been long after releasing the GNU GCC 8.x, but at last, there is a trusted repository, which has offered us packages for GNU GCC 8.x, which won’t break your system! Many of us prefer CentOS 7 because it offers free enterprise-class operating system and as mentioned in our article before – How to install new gcc and development tools under CentOS 7 there are a couple of approved external repositories for CentOS, which you can trust https://wiki.centos.org/AdditionalResources/Repositories. In one of them Software Collection – https://www.softwarecollections.org/en/scls/ several months ago the GNU GCC 8.x packages were added!
At present, the GNU GCC version is gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3).
Here are the steps how you can install GNU GCC 8 and how you can use it:

STEP 1) Update your system and install the repository in your system

The commands:

yum update -y
yum -y install centos-release-scl


The output in our server:

[root@my-centos7 ~]# yum update -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.coreix.net
 * extras: mirror.netweaver.uk
 * updates: mirror.netweaver.uk
No packages marked for update
[root@my-centos7 ~]# yum -y install centos-release-scl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.coreix.net
 * extras: mirror.netweaver.uk
 * updates: mirror.netweaver.uk
Resolving Dependencies
--> Running transaction check
---> Package centos-release-scl.noarch 0:2-3.el7.centos will be installed
--> Processing Dependency: centos-release-scl-rh for package: centos-release-scl-2-3.el7.centos.noarch
--> Running transaction check
---> Package centos-release-scl-rh.noarch 0:2-3.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================
 Package                                           Arch                               Version                                      Repository                          Size
============================================================================================================================================================================
Installing:
 centos-release-scl                                noarch                             2-3.el7.centos                               extras                              12 k
Installing for dependencies:
 centos-release-scl-rh                             noarch                             2-3.el7.centos                               extras                              12 k

Transaction Summary
============================================================================================================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 24 k
Installed size: 39 k
Downloading packages:
(1/2): centos-release-scl-rh-2-3.el7.centos.noarch.rpm                                                                                               |  12 kB  00:00:00     
(2/2): centos-release-scl-2-3.el7.centos.noarch.rpm                                                                                                  |  12 kB  00:00:00     
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                       156 kB/s |  24 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : centos-release-scl-rh-2-3.el7.centos.noarch                                                                                                              1/2 
  Installing : centos-release-scl-2-3.el7.centos.noarch                                                                                                                 2/2 
  Verifying  : centos-release-scl-2-3.el7.centos.noarch                                                                                                                 1/2 
  Verifying  : centos-release-scl-rh-2-3.el7.centos.noarch                                                                                                              2/2 

Installed:
  centos-release-scl.noarch 0:2-3.el7.centos                                                                                                                                

Dependency Installed:
  centos-release-scl-rh.noarch 0:2-3.el7.centos                                                                                                                             

Complete!

STEP 2) Install the development tools and GNU GCC 8, which is part of the “devtools” package

[root@my-centos7 ~]# yum install devtoolset-8
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.coreix.net
 * centos-sclo-rh: mirror.netweaver.uk
 * centos-sclo-sclo: mirror.netweaver.uk
 * extras: mirror.netweaver.uk
 * updates: mirror.netweaver.uk
Resolving Dependencies
--> Running transaction check
---> Package devtoolset-8.x86_64 0:8.1-1.el7 will be installed
--> Processing Dependency: devtoolset-8-toolchain for package: devtoolset-8-8.1-1.el7.x86_64
--> Processing Dependency: devtoolset-8-runtime for package: devtoolset-8-8.1-1.el7.x86_64
--> Processing Dependency: devtoolset-8-perftools for package: devtoolset-8-8.1-1.el7.x86_64
--> Running transaction check
---> Package devtoolset-8-perftools.x86_64 0:8.1-1.el7 will be installed
--> Processing Dependency: devtoolset-8-valgrind for package: devtoolset-8-perftools-8.1-1.el7.x86_64
--> Processing Dependency: devtoolset-8-systemtap for package: devtoolset-8-perftools-8.1-1.el7.x86_64
--> Processing Dependency: devtoolset-8-oprofile for package: devtoolset-8-perftools-8.1-1.el7.x86_64
--> Processing Dependency: devtoolset-8-dyninst for package: devtoolset-8-perftools-8.1-1.el7.x86_64
.....
.....
--> Finished Dependency Resolution

Dependencies Resolved

============================================================================================================================================================================
 Package                                               Arch                          Version                                    Repository                             Size
============================================================================================================================================================================
Installing:
 devtoolset-8                                          x86_64                        8.1-1.el7                                  centos-sclo-rh                        5.4 k
Installing for dependencies:
 audit-libs-python                                     x86_64                        2.8.4-4.el7                                base                                   76 k
 avahi-libs                                            x86_64                        0.6.31-19.el7                              base                                   61 k
 boost-date-time                                       x86_64                        1.53.0-27.el7                              base                                   52 k
 boost-system                                          x86_64                        1.53.0-27.el7                              base                                   40 k
 boost-thread                                          x86_64                        1.53.0-27.el7                              base                                   57 k
 checkpolicy                                           x86_64                        2.5-8.el7                                  base                                  295 k
 cpp                                                   x86_64                        4.8.5-36.el7_6.2                           updates                               5.9 M
 devtoolset-8-binutils                                 x86_64                        2.30-54.el7                                centos-sclo-rh                        5.5 M
 devtoolset-8-dwz                                      x86_64                        0.12-1.1.el7                               centos-sclo-rh                         98 k
 devtoolset-8-dyninst                                  x86_64                        9.3.2-6.el7                                centos-sclo-rh                        3.6 M
 devtoolset-8-elfutils                                 x86_64                        0.176-1.el7                                centos-sclo-rh                        431 k
 devtoolset-8-elfutils-libelf                          x86_64                        0.176-1.el7                                centos-sclo-rh                        202 k
 devtoolset-8-elfutils-libs                            x86_64                        0.176-1.el7                                centos-sclo-rh                        311 k
 devtoolset-8-gcc                                      x86_64                        8.3.1-3.1.el7                              centos-sclo-rh                         30 M
 devtoolset-8-gcc-c++                                  x86_64                        8.3.1-3.1.el7                              centos-sclo-rh                         12 M
 devtoolset-8-gcc-gfortran                             x86_64                        8.3.1-3.1.el7                              centos-sclo-rh                         12 M
 devtoolset-8-gdb                                      x86_64                        8.2-3.el7                                  centos-sclo-rh                        3.4 M
 devtoolset-8-libquadmath-devel                        x86_64                        8.3.1-3.1.el7                              centos-sclo-rh                        155 k
 devtoolset-8-libstdc++-devel                          x86_64                        8.3.1-3.1.el7                              centos-sclo-rh                        2.7 M
 devtoolset-8-ltrace                                   x86_64                        0.7.91-1.el7                               centos-sclo-rh                        148 k
 devtoolset-8-make                                     x86_64                        1:4.2.1-4.el7                              centos-sclo-rh                        485 k
 devtoolset-8-memstomp                                 x86_64                        0.1.5-5.el7                                centos-sclo-rh                        442 k
 devtoolset-8-oprofile                                 x86_64                        1.3.0-2.el7                                centos-sclo-rh                        1.8 M
 devtoolset-8-perftools                                x86_64                        8.1-1.el7                                  centos-sclo-rh                        2.8 k
 devtoolset-8-runtime                                  x86_64                        8.1-1.el7                                  centos-sclo-rh                         20 k
 devtoolset-8-strace                                   x86_64                        4.24-4.el7                                 centos-sclo-rh                        1.0 M
 devtoolset-8-systemtap                                x86_64                        3.3-2.el7                                  centos-sclo-rh                        144 k
 devtoolset-8-systemtap-client                         x86_64                        3.3-2.el7                                  centos-sclo-rh                        2.8 M
 devtoolset-8-systemtap-devel                          x86_64                        3.3-2.el7                                  centos-sclo-rh                        2.2 M
 devtoolset-8-systemtap-runtime                        x86_64                        3.3-2.el7                                  centos-sclo-rh                        427 k
 devtoolset-8-toolchain                                x86_64                        8.1-1.el7                                  centos-sclo-rh                        3.0 k
 devtoolset-8-valgrind                                 x86_64                        1:3.14.0-16.el7                            centos-sclo-rh                         11 M
 gcc                                                   x86_64                        4.8.5-36.el7_6.2                           updates                                16 M
 glibc-devel                                           x86_64                        2.17-260.el7_6.6                           updates                               1.1 M
 glibc-headers                                         x86_64                        2.17-260.el7_6.6                           updates                               684 k
 kernel-debug-devel                                    x86_64                        3.10.0-957.27.2.el7                        updates                                17 M
 kernel-headers                                        x86_64                        3.10.0-957.27.2.el7                        updates                               8.0 M
 libcgroup                                             x86_64                        0.41-20.el7                                base                                   66 k
 libgfortran5                                          x86_64                        8.2.1-1.3.1.el7_5                          updates                               796 k
 libmpc                                                x86_64                        1.0.1-3.el7                                base                                   51 k
 libquadmath                                           x86_64                        4.8.5-36.el7_6.2                           updates                               189 k
 libsemanage-python                                    x86_64                        2.5-14.el7                                 base                                  113 k
 mpfr                                                  x86_64                        3.1.1-4.el7                                base                                  203 k
 perl                                                  x86_64                        4:5.16.3-294.el7_6                         updates                               8.0 M
 perl-Carp                                             noarch                        1.26-244.el7                               base                                   19 k
 perl-Encode                                           x86_64                        2.51-7.el7                                 base                                  1.5 M
 perl-Exporter                                         noarch                        5.68-3.el7                                 base                                   28 k
 perl-File-Path                                        noarch                        2.09-2.el7                                 base                                   26 k
 perl-File-Temp                                        noarch                        0.23.01-3.el7                              base                                   56 k
 perl-Filter                                           x86_64                        1.49-3.el7                                 base                                   76 k
 perl-Getopt-Long                                      noarch                        2.40-3.el7                                 base                                   56 k
 perl-HTTP-Tiny                                        noarch                        0.033-3.el7                                base                                   38 k
 perl-PathTools                                        x86_64                        3.40-5.el7                                 base                                   82 k
 perl-Pod-Escapes                                      noarch                        1:1.04-294.el7_6                           updates                                51 k
 perl-Pod-Perldoc                                      noarch                        3.20-4.el7                                 base                                   87 k
 perl-Pod-Simple                                       noarch                        1:3.28-4.el7                               base                                  216 k
 perl-Pod-Usage                                        noarch                        1.63-3.el7                                 base                                   27 k
 perl-Scalar-List-Utils                                x86_64                        1.27-248.el7                               base                                   36 k
 perl-Socket                                           x86_64                        2.010-4.el7                                base                                   49 k
 perl-Storable                                         x86_64                        2.45-3.el7                                 base                                   77 k
 perl-Text-ParseWords                                  noarch                        3.29-4.el7                                 base                                   14 k
 perl-Time-HiRes                                       x86_64                        4:1.9725-3.el7                             base                                   45 k
 perl-Time-Local                                       noarch                        1.2300-2.el7                               base                                   24 k
 perl-constant                                         noarch                        1.27-2.el7                                 base                                   19 k
 perl-libs                                             x86_64                        4:5.16.3-294.el7_6                         updates                               688 k
 perl-macros                                           x86_64                        4:5.16.3-294.el7_6                         updates                                44 k
 perl-parent                                           noarch                        1:0.225-244.el7                            base                                   12 k
 perl-podlators                                        noarch                        2.5.1-3.el7                                base                                  112 k
 perl-threads                                          x86_64                        1.87-4.el7                                 base                                   49 k
 perl-threads-shared                                   x86_64                        1.43-6.el7                                 base                                   39 k
 policycoreutils-python                                x86_64                        2.5-29.el7_6.1                             updates                               456 k
 python-IPy                                            noarch                        0.75-6.el7                                 base                                   32 k
 scl-utils                                             x86_64                        20130529-19.el7                            base                                   24 k
 setools-libs                                          x86_64                        3.3.8-4.el7                                base                                  620 k
 unzip                                                 x86_64                        6.0-19.el7                                 base                                  170 k
 zip                                                   x86_64                        3.0-11.el7                                 base                                  260 k

Transaction Summary
============================================================================================================================================================================
Install  1 Package (+76 Dependent packages)

Total download size: 155 M
Installed size: 411 M
Is this ok [y/d/N]: y
Downloading packages:
(1/77): audit-libs-python-2.8.4-4.el7.x86_64.rpm
.....
.....
Installed:
  devtoolset-8.x86_64 0:8.1-1.el7                                                                                                                                           

Dependency Installed:
  audit-libs-python.x86_64 0:2.8.4-4.el7                   avahi-libs.x86_64 0:0.6.31-19.el7                    boost-date-time.x86_64 0:1.53.0-27.el7                    
  boost-system.x86_64 0:1.53.0-27.el7                      boost-thread.x86_64 0:1.53.0-27.el7                  checkpolicy.x86_64 0:2.5-8.el7                            
  cpp.x86_64 0:4.8.5-36.el7_6.2                            devtoolset-8-binutils.x86_64 0:2.30-54.el7           devtoolset-8-dwz.x86_64 0:0.12-1.1.el7                    
  devtoolset-8-dyninst.x86_64 0:9.3.2-6.el7                devtoolset-8-elfutils.x86_64 0:0.176-1.el7           devtoolset-8-elfutils-libelf.x86_64 0:0.176-1.el7         
  devtoolset-8-elfutils-libs.x86_64 0:0.176-1.el7          devtoolset-8-gcc.x86_64 0:8.3.1-3.1.el7              devtoolset-8-gcc-c++.x86_64 0:8.3.1-3.1.el7               
  devtoolset-8-gcc-gfortran.x86_64 0:8.3.1-3.1.el7         devtoolset-8-gdb.x86_64 0:8.2-3.el7                  devtoolset-8-libquadmath-devel.x86_64 0:8.3.1-3.1.el7     
  devtoolset-8-libstdc++-devel.x86_64 0:8.3.1-3.1.el7      devtoolset-8-ltrace.x86_64 0:0.7.91-1.el7            devtoolset-8-make.x86_64 1:4.2.1-4.el7                    
  devtoolset-8-memstomp.x86_64 0:0.1.5-5.el7               devtoolset-8-oprofile.x86_64 0:1.3.0-2.el7           devtoolset-8-perftools.x86_64 0:8.1-1.el7                 
  devtoolset-8-runtime.x86_64 0:8.1-1.el7                  devtoolset-8-strace.x86_64 0:4.24-4.el7              devtoolset-8-systemtap.x86_64 0:3.3-2.el7                 
  devtoolset-8-systemtap-client.x86_64 0:3.3-2.el7         devtoolset-8-systemtap-devel.x86_64 0:3.3-2.el7      devtoolset-8-systemtap-runtime.x86_64 0:3.3-2.el7         
  devtoolset-8-toolchain.x86_64 0:8.1-1.el7                devtoolset-8-valgrind.x86_64 1:3.14.0-16.el7         gcc.x86_64 0:4.8.5-36.el7_6.2                             
  glibc-devel.x86_64 0:2.17-260.el7_6.6                    glibc-headers.x86_64 0:2.17-260.el7_6.6              kernel-debug-devel.x86_64 0:3.10.0-957.27.2.el7           
  kernel-headers.x86_64 0:3.10.0-957.27.2.el7              libcgroup.x86_64 0:0.41-20.el7                       libgfortran5.x86_64 0:8.2.1-1.3.1.el7_5                   
  libmpc.x86_64 0:1.0.1-3.el7                              libquadmath.x86_64 0:4.8.5-36.el7_6.2                libsemanage-python.x86_64 0:2.5-14.el7                    
  mpfr.x86_64 0:3.1.1-4.el7                                perl.x86_64 4:5.16.3-294.el7_6                       perl-Carp.noarch 0:1.26-244.el7                           
  perl-Encode.x86_64 0:2.51-7.el7                          perl-Exporter.noarch 0:5.68-3.el7                    perl-File-Path.noarch 0:2.09-2.el7                        
  perl-File-Temp.noarch 0:0.23.01-3.el7                    perl-Filter.x86_64 0:1.49-3.el7                      perl-Getopt-Long.noarch 0:2.40-3.el7                      
  perl-HTTP-Tiny.noarch 0:0.033-3.el7                      perl-PathTools.x86_64 0:3.40-5.el7                   perl-Pod-Escapes.noarch 1:1.04-294.el7_6                  
  perl-Pod-Perldoc.noarch 0:3.20-4.el7                     perl-Pod-Simple.noarch 1:3.28-4.el7                  perl-Pod-Usage.noarch 0:1.63-3.el7                        
  perl-Scalar-List-Utils.x86_64 0:1.27-248.el7             perl-Socket.x86_64 0:2.010-4.el7                     perl-Storable.x86_64 0:2.45-3.el7                         
  perl-Text-ParseWords.noarch 0:3.29-4.el7                 perl-Time-HiRes.x86_64 4:1.9725-3.el7                perl-Time-Local.noarch 0:1.2300-2.el7                     
  perl-constant.noarch 0:1.27-2.el7                        perl-libs.x86_64 4:5.16.3-294.el7_6                  perl-macros.x86_64 4:5.16.3-294.el7_6                     
  perl-parent.noarch 1:0.225-244.el7                       perl-podlators.noarch 0:2.5.1-3.el7                  perl-threads.x86_64 0:1.87-4.el7                          
  perl-threads-shared.x86_64 0:1.43-6.el7                  policycoreutils-python.x86_64 0:2.5-29.el7_6.1       python-IPy.noarch 0:0.75-6.el7                            
  scl-utils.x86_64 0:20130529-19.el7                       setools-libs.x86_64 0:3.3.8-4.el7                    unzip.x86_64 0:6.0-19.el7                                 
  zip.x86_64 0:3.0-11.el7                                 

Complete!

STEP 3) Use the installed tools.

Because using such a package with multiple complex packages you must configure multiple environments and links to the versions you installed replacing the ones from your base system, but the package comes with a handy tool, which executing it will configure everything and you are ready to go!

scl enable devtoolset-8 bash

Whenever you want to use the new GCC you must execute it or you will end up with the default one.

[root@my-centos7 ~]# scl enable devtoolset-8 bash
[root@my-centos7 ~]# gcc --version
gcc (GCC) 8.3.1 20190311 (Red Hat 8.3.1-3)
Copyright (C) 2018 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.

Using Software Collection you could install multiple GNU GCC version 6, 7 (we have article on the subject – How to install new gcc and development tools under CentOS 7) and now 8.

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