Question: The default?gcc?version on CentOS is too old to build a particular application. How can I upgrade the version of?gcc?installed on CentOS?
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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 installdevtools, 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?gccversion 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
gcc (GCC) 4.7.2 20121015 (Red Hat 4.7.2-5)
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++
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来自 <http://ask.xmodulo.com/upgrade-gcc-centos.html>
发现问题 解决问题：How to upgrade gcc on CentOS
原文：http://www.cnblogs.com/keedor/p/4574788.html