How to upgrade gcc on CentOS6.5

How to upgrade gcc on CentOS6.5

Question: The default gcc version on CentOS6.5 is too old to build a particular application. How can I upgrade the version of gcc installed on CentOS6.5?

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As of CentOS 6.5, the default version of gcc installed is 4.4.7. If you want to upgrade gcc on CentOS, you can install devtools, which is a CentOS version of Red Hat Developer Toolset. The devtools, which is available for CentOS 5 and 6, contains a suite of development tools including gcc, gdb, binutils, elfutils, etc. The devtools 1.1. offers gcc version 4.7.2.

To install devtools on CentOS, use the following commands.

$ sudo wget http://people.centos.org/tru/devtools-1.1/devtools-1.1.repo -P /etc/yum.repos.d
$ sudo sh -c 'echo "enabled=1" >> /etc/yum.repos.d/devtools-1.1.repo'
$ sudo yum install devtoolset-1.1

devtools will be installed under /opt/centos/devtoolset-1.1.

To use gcc from devtoolset, use the following command. This command will launch a new shell, wherein all environment variables are automatically set to use devtools.

$ scl enable devtoolset-1.1 bash
$ gcc --version

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Alternatively, you can explicitly define the following variables to use devtools.

export CC=/opt/centos/devtoolset-1.1/root/usr/bin/gcc  
export CPP=/opt/centos/devtoolset-1.1/root/usr/bin/cpp
export CXX=/opt/centos/devtoolset-1.1/root/usr/bin/c++

参考:
http://ask.xmodulo.com/upgrade-gcc-centos.html

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