How to install new gcc and development tools under CentOS 7

CentOS 7 is very stable and conservative operating system. It offers us free enterprise class operating system, which is compatible with Red Hat, but in many situations we need a newer (not even a bleeding edge) tools from a trusted source not from a unknown third repository! Let’s say you are developer and you need newer than GCC 4.8 (which is more than 5 years old nd at present we have stable GCC 8.x stable branch). There are repositories, which would surely break your system at one point even they do not break it at first installing a newer version of GNU GCC! There is a really easy and “official” way to have newer development software in CentOS 7 by using the Software Collection – https://www.softwarecollections.org/en/scls/
We can say these packages are officially maintained by CentOS 7 team and as a whole Red Hat/CentOS officials and community developers! The collaction aims at

  1. Multiple version installed of the same components, you can have multiple GNU GCC installed without breaking your system or compiling manually. Not only GNU GCC, you can have PHP, Ruby, Pyhton, famous databases like Mysql, Mongodb, PostgreSQL and many more
  2. To have newer version of the same components, you can have multiple version of GNU GCC – you can install with no worries of breaking your system GNU GCC 6 and 7

So here is how you do it:

STEP 1) Install the repository in your system

yum install centos-release-scl

Here is the output in our system:

[srv@local ~]# yum -y install centos-release-scl
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.crazyfrogs.org
 * extras: centos.quelquesmots.fr
 * updates: centos.mirror.fr.planethoster.net
Resolving Dependencies
--> Running transaction check
---> Package centos-release-scl.noarch 0:2-2.el7.centos will be installed
--> Processing Dependency: centos-release-scl-rh for package: centos-release-scl-2-2.el7.centos.noarch
--> Running transaction check
---> Package centos-release-scl-rh.noarch 0:2-2.el7.centos will be installed
--> Finished Dependency Resolution

Dependencies Resolved

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

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

STEP 2) Install the development tools and GNU GCC 7, which is part of the “devtools” package

yum install devtoolset-7-gcc*

Here is the output in our system:

[srv@local ~]# yum install devtoolset-7-gcc*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
 * base: centos.crazyfrogs.org
 * extras: centos.quelquesmots.fr
 * updates: centos.mirror.fr.planethoster.net
centos-sclo-rh                                                                                                                                 | 3.0 kB  00:00:00     
centos-sclo-sclo                                                                                                                               | 2.9 kB  00:00:00     
(1/2): centos-sclo-sclo/x86_64/primary_db                                                                                                      | 281 kB  00:00:00     
(2/2): centos-sclo-rh/x86_64/primary_db                                                                                                        | 3.5 MB  00:00:03     
Resolving Dependencies
--> Running transaction check
---> Package devtoolset-7-gcc.x86_64 0:7.3.1-5.4.el7 will be installed
--> Processing Dependency: glibc-devel >= 2.2.90-12 for package: devtoolset-7-gcc-7.3.1-5.4.el7.x86_64
--> Processing Dependency: devtoolset-7-binutils >= 2.22.52.0.1 for package: devtoolset-7-gcc-7.3.1-5.4.el7.x86_64
--> Processing Dependency: devtoolset-7-runtime for package: devtoolset-7-gcc-7.3.1-5.4.el7.x86_64
--> Processing Dependency: libmpfr.so.4()(64bit) for package: devtoolset-7-gcc-7.3.1-5.4.el7.x86_64
--> Processing Dependency: libmpc.so.3()(64bit) for package: devtoolset-7-gcc-7.3.1-5.4.el7.x86_64
---> Package devtoolset-7-gcc-c++.x86_64 0:7.3.1-5.4.el7 will be installed
--> Processing Dependency: devtoolset-7-libstdc++-devel = 7.3.1-5.4.el7 for package: devtoolset-7-gcc-c++-7.3.1-5.4.el7.x86_64
---> Package devtoolset-7-gcc-gdb-plugin.x86_64 0:7.3.1-5.4.el7 will be installed
---> Package devtoolset-7-gcc-gfortran.x86_64 0:7.3.1-5.4.el7 will be installed
--> Processing Dependency: devtoolset-7-libquadmath-devel = 7.3.1-5.4.el7 for package: devtoolset-7-gcc-gfortran-7.3.1-5.4.el7.x86_64
--> Processing Dependency: libgfortran4 >= 7.1.1-2 for package: devtoolset-7-gcc-gfortran-7.3.1-5.4.el7.x86_64
---> Package devtoolset-7-gcc-plugin-devel.x86_64 0:7.3.1-5.4.el7 will be installed
--> Processing Dependency: mpfr-devel >= 2.2.1 for package: devtoolset-7-gcc-plugin-devel-7.3.1-5.4.el7.x86_64
--> Processing Dependency: libmpc-devel >= 0.8.1 for package: devtoolset-7-gcc-plugin-devel-7.3.1-5.4.el7.x86_64
--> Processing Dependency: gmp-devel >= 4.1.2-8 for package: devtoolset-7-gcc-plugin-devel-7.3.1-5.4.el7.x86_64
--> Running transaction check
---> Package devtoolset-7-binutils.x86_64 0:2.28-11.el7 will be installed
---> Package devtoolset-7-libquadmath-devel.x86_64 0:7.3.1-5.4.el7 will be installed
--> Processing Dependency: libquadmath for package: devtoolset-7-libquadmath-devel-7.3.1-5.4.el7.x86_64
---> Package devtoolset-7-libstdc++-devel.x86_64 0:7.3.1-5.4.el7 will be installed
---> Package devtoolset-7-runtime.x86_64 0:7.1-4.el7 will be installed
--> Processing Dependency: scl-utils >= 20120927-11 for package: devtoolset-7-runtime-7.1-4.el7.x86_64
--> Processing Dependency: /usr/sbin/semanage for package: devtoolset-7-runtime-7.1-4.el7.x86_64
--> Processing Dependency: /usr/sbin/semanage for package: devtoolset-7-runtime-7.1-4.el7.x86_64
---> Package glibc-devel.x86_64 0:2.17-222.el7 will be installed
--> Processing Dependency: glibc-headers = 2.17-222.el7 for package: glibc-devel-2.17-222.el7.x86_64
--> Processing Dependency: glibc-headers for package: glibc-devel-2.17-222.el7.x86_64
---> Package gmp-devel.x86_64 1:6.0.0-15.el7 will be installed
---> Package libgfortran4.x86_64 0:7.2.1-1.2.1.el7_5 will be installed
---> Package libmpc.x86_64 0:1.0.1-3.el7 will be installed
---> Package libmpc-devel.x86_64 0:1.0.1-3.el7 will be installed
---> Package mpfr.x86_64 0:3.1.1-4.el7 will be installed
---> Package mpfr-devel.x86_64 0:3.1.1-4.el7 will be installed
--> Running transaction check
---> Package glibc-headers.x86_64 0:2.17-222.el7 will be installed
--> Processing Dependency: kernel-headers >= 2.2.1 for package: glibc-headers-2.17-222.el7.x86_64
--> Processing Dependency: kernel-headers for package: glibc-headers-2.17-222.el7.x86_64
---> Package libquadmath.x86_64 0:4.8.5-28.el7_5.1 will be installed
---> Package policycoreutils-python.x86_64 0:2.5-22.el7 will be installed
--> Processing Dependency: setools-libs >= 3.3.8-2 for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libsemanage-python >= 2.5-9 for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: audit-libs-python >= 2.1.3-4 for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: python-IPy for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.4)(64bit) for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libqpol.so.1(VERS_1.2)(64bit) for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libcgroup for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libapol.so.4(VERS_4.0)(64bit) for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: checkpolicy for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libqpol.so.1()(64bit) for package: policycoreutils-python-2.5-22.el7.x86_64
--> Processing Dependency: libapol.so.4()(64bit) for package: policycoreutils-python-2.5-22.el7.x86_64
---> Package scl-utils.x86_64 0:20130529-18.el7_4 will be installed
--> Running transaction check
---> Package audit-libs-python.x86_64 0:2.8.1-3.el7 will be installed
---> Package checkpolicy.x86_64 0:2.5-6.el7 will be installed
---> Package kernel-headers.x86_64 0:3.10.0-862.3.2.el7 will be installed
---> Package libcgroup.x86_64 0:0.41-15.el7 will be installed
---> Package libsemanage-python.x86_64 0:2.5-11.el7 will be installed
---> Package python-IPy.noarch 0:0.75-6.el7 will be installed
---> Package setools-libs.x86_64 0:3.3.8-2.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

======================================================================================================================================================================
 Package                                             Arch                        Version                                    Repository                           Size
======================================================================================================================================================================
Installing:
 devtoolset-7-gcc                                    x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                       29 M
 devtoolset-7-gcc-c++                                x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                       11 M
 devtoolset-7-gcc-gdb-plugin                         x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                      123 k
 devtoolset-7-gcc-gfortran                           x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                       11 M
 devtoolset-7-gcc-plugin-devel                       x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                      1.3 M
Installing for dependencies:
 audit-libs-python                                   x86_64                      2.8.1-3.el7                                base                                 75 k
 checkpolicy                                         x86_64                      2.5-6.el7                                  base                                294 k
 devtoolset-7-binutils                               x86_64                      2.28-11.el7                                centos-sclo-rh                      5.3 M
 devtoolset-7-libquadmath-devel                      x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                      153 k
 devtoolset-7-libstdc++-devel                        x86_64                      7.3.1-5.4.el7                              centos-sclo-rh                      2.6 M
 devtoolset-7-runtime                                x86_64                      7.1-4.el7                                  centos-sclo-rh                       20 k
 glibc-devel                                         x86_64                      2.17-222.el7                               base                                1.1 M
 glibc-headers                                       x86_64                      2.17-222.el7                               base                                678 k
 gmp-devel                                           x86_64                      1:6.0.0-15.el7                             base                                181 k
 kernel-headers                                      x86_64                      3.10.0-862.3.2.el7                         updates                             7.1 M
 libcgroup                                           x86_64                      0.41-15.el7                                base                                 65 k
 libgfortran4                                        x86_64                      7.2.1-1.2.1.el7_5                          updates                             676 k
 libmpc                                              x86_64                      1.0.1-3.el7                                base                                 51 k
 libmpc-devel                                        x86_64                      1.0.1-3.el7                                base                                 32 k
 libquadmath                                         x86_64                      4.8.5-28.el7_5.1                           updates                             188 k
 libsemanage-python                                  x86_64                      2.5-11.el7                                 base                                112 k
 mpfr                                                x86_64                      3.1.1-4.el7                                base                                203 k
 mpfr-devel                                          x86_64                      3.1.1-4.el7                                base                                 68 k
 policycoreutils-python                              x86_64                      2.5-22.el7                                 base                                454 k
 python-IPy                                          noarch                      0.75-6.el7                                 base                                 32 k
 scl-utils                                           x86_64                      20130529-18.el7_4                          base                                 24 k
 setools-libs                                        x86_64                      3.3.8-2.el7                                base                                619 k

Transaction Summary
======================================================================================================================================================================
Install  5 Packages (+22 Dependent packages)

Total download size: 73 M
Installed size: 188 M
Is this ok [y/d/N]: y

STEP 3) Use the installed tools.

Because using such a package with multiple complex packages you must configure multiple environment 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-7 bash

And you’ll be in a bash environment, which is configured for GNU GCC 7.

[srv@local ~]# scl enable devtoolset-7 bash
[srv@local ~]# which gcc
/opt/rh/devtoolset-7/root/usr/bin/gcc
[srv@local ~]# gcc --version
gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
Copyright (C) 2017 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@srv ~]#

As long as you are in this bash shell (you do not type exit) your environment is configured to use GNU GCC 7 and you can use make, cmake to compile your projects with this newer version.

Before entering the devtoolset-7 bash shell, here is the error for the GNU GCC version:

[srv@local build]# cmake3 ../
-- The C compiler identification is GNU 4.8.5
-- The CXX compiler identification is GNU 4.8.5
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:29 (message):
  g++ version must be at least 5.1!


-- Configuring incomplete, errors occurred!
See also "/root/myproject/build/CMakeFiles/CMakeOutput.log".

After entering the devtoolset-7 bash shell, everything is configured OK and you can proceed with the “make”:

[srv@local build]# rm -R *
[srv@local build]# cmake3 ../ 
-- The C compiler identification is GNU 7.3.1
-- The CXX compiler identification is GNU 7.3.1
-- Check for working C compiler: /opt/rh/devtoolset-7/root/usr/bin/cc
-- Check for working C compiler: /opt/rh/devtoolset-7/root/usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /opt/rh/devtoolset-7/root/usr/bin/c++
-- Check for working CXX compiler: /opt/rh/devtoolset-7/root/usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE  
-- Found OpenSSL: /usr/lib64/libcrypto.so (found version "1.0.2k") 
-- Configuring done
-- Generating done
-- Build files have been written to: /root/myproject/build
[srv@local ~]# make -j 8
Scanning dependencies of target myproject
[  3%] Building C object CMakeFiles/myproject.dir/myproject/backend/cpu/crypto/c_keccak.c.o
[  7%] Building C object CMakeFiles/myproject.dir/myproject/backend/cpu/crypto/c_groestl.c.o
[ 15%] Building C object CMakeFiles/myproject.dir/myproject/backend/cpu/crypto/c_blake256.c.o
...

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