Centos – How tonstall gcc 4.7.x/4.8.x on CentOS

Let us assume the ISO is already burnt into a DVD, or the ISO is present as a file on your file system. First, we need to mount it. The preferred mount point to mount it is /media/CentOS, because yum is configured to look for repositories from this location by default while installing packages from DVD. The steps below describe how to mount the ISO (whether present as a file or burnt into DVD) and install packages from the ISO.

1. If you have the ISO burnt into a DVD, insert the DVD into the CentOS system. If the ISO is not burnt into a DVD, but present as a separate file on the file system, then skip the next two steps and go directly to step 4 in this list.

2. Check if the DVD has been mounted automatically. To do this execute the following command:

   mount | grep CentOS
   

   If this command returns an output, it means the DVD has been mounted. For example, the following example output shows that the DVD has been mounted to /media/CentOS_6.4_Final automatically.

   /dev/sr0 on /media/CentOS_6.4_Final type iso9660 (ro,nosuid,nodev,uhelper=udisks,uid=500,gid=500,iocharset=utf8,mode=0400,dmode=0500)
   

3. If the CD has been mounted automatically, then ignore this step. Otherwise, mount it manually.

   mkdir /media/CentOS
   mount -t iso9660 /dev/sr0 /media/CentOS
   

4. If the ISO is present on the file system, mount it to /media/CentOS using the mount command with -o loop option.

   mount -o loop CentOS-6.4-x86_64-bin-DVD1.iso /media/CentOS/
   

5. Execute: cat /etc/yum.repos.d/CentOS-Media.repo and read the information provided as comments in this file. See the repo name within square brackets. It is c6-media by default. Also, see the locations specified for baseurl property. These URLs point to local directories /media/CentOS, /media/cdrom and /media/cdrecorder/ by default.

6. If the DVD is mounted to a mount point specified in the baseurl property, then ignore this step. Otherwise, create a symbolic link at a location specified in the baseurl property with the mount point as its target. An example follows.

   ln -s /media/CentOS_6.4_Final /media/CentOS
   

7. In the shell, execute the yum command while disabling all repos except the repo specified in /etc/yum.repos.d/CentOS-Media.repo:

   yum --disablerepo=\* --enablerepo=c6-media install gcc
   

I don't think it's possible to install GCC-5 on CentOS 5, its glibc version (2.5) is way too old.

For CentOS 6, use the following instructions:

• http://en.librehat.com/blog/build-gcc-5-dot-2-on-rhel-6/
• http://www.linuxfromscratch.org/blfs/view/cvs/general/gcc.html

Or you can use Docker with the following Dockerfile:

FROM centos:centos6

RUN yum install -y gcc gcc-c++ wget xz libgcc glibc-devel glibc-headers

# Run some tests
RUN gcc --version && \
    g++ --version && \
    which gcc && \
    which g++
RUN mkdir ~/tests && \
    cd ~/tests && \
    echo '#include <iostream>' > main.cpp && \
    echo 'using namespace std;' >> main.cpp && \
    echo 'int main() {' >> main.cpp && \
    echo '    cout << "Hello world!" << endl;' >> main.cpp && \
    echo '    return 0;' >> main.cpp && \
    echo '}' >> main.cpp && \
    g++ main.cpp -o main && \
    ./main

# Download and compile GCC-5
# http://en.librehat.com/blog/build-gcc-5-dot-2-on-rhel-6/

# Download and extract source code
ENV gcc_version "5.3.0"
RUN wget --no-verbose \
        http://ftpmirror.gnu.org/gcc/gcc-${gcc_version}/gcc-${gcc_version}.tar.bz2 && \
    tar xf gcc-${gcc_version}.tar.bz2
RUN wget --no-verbose \
        https://gmplib.org/download/gmp/gmp-6.1.0.tar.xz && \
    tar xf gmp-6.1.0.tar.xz && \
    mv gmp-6.1.0 gcc-${gcc_version}/gmp
RUN wget --no-verbose \
        ftp://ftp.gnu.org/gnu/mpc/mpc-1.0.3.tar.gz && \
    tar xf mpc-1.0.3.tar.gz && \
    mv mpc-1.0.3 gcc-${gcc_version}/mpc
RUN wget --no-verbose \
        http://www.mpfr.org/mpfr-current/mpfr-3.1.4.tar.xz && \
    tar xf mpfr-3.1.4.tar.xz && \
    mv mpfr-3.1.4 gcc-${gcc_version}/mpfr

# Compile and install GCC
# "we highly recommend that GCC be built into a separate directory from the sources which does not reside within the source tree"
RUN mkdir gcc-${gcc_version}_build && \
    cd gcc-${gcc_version}_build && \
    ../gcc-${gcc_version}/configure \
        --prefix=/usr \
        --disable-multilib \
        --enable-languages=c,c++ \
        --enable-libstdcxx-threads \
        --enable-libstdcxx-time \
        --enable-shared \
        --enable-__cxa_atexit \
        --disable-libunwind-exceptions \
        --disable-libada \
        --host x86_64-redhat-linux-gnu \
        --build x86_64-redhat-linux-gnu \
        --with-default-libstdcxx-abi=gcc4-compatible
RUN cd gcc-${gcc_version}_build && make -j4
RUN cd gcc-${gcc_version}_build && make install

# Validate the installed compiler
RUN hash -r && \
    gcc --version && \
    g++ --version && \
    which gcc && \
    which g++

# Register new libraries with `ldconfig`
RUN echo "/usr/local/lib64" > usrLocalLib64.conf && \
    mv usrLocalLib64.conf /etc/ld.so.conf.d/ && \
    ldconfig


# Clean out all the garbage
RUN rm -rf ~/${gcc_release} ~/{gcc_release}_build ~/tests