How to install g++ 4.7.2 & c++11 on CentOS 5.x

From：http://unix.stackexchange.com/questions/63587/how-to-install-g-4-7-2-c11-on-centos-5-x

From this answer to "Install gcc 4.7 on CentOS [6.x]", the easiest way to get g++ 4.7, and the required tools and libraries, for CentOS 5.x is via the devtools package:

cd /etc/yum.repos.dwget http://people.centos.org/tru/devtools/devtools.repo yum --enablerepo=testing-devtools-6 install devtoolset-1.0

Since you're running g++ manually (as opposed to through make), you'll need to update your $PATHvariable so your shell will use the new gcc, g++, etc. binaries:

export PATH=/opt/centos/devtoolset-1.0/root/usr/bin/:$PATH

At this point, your g++ should be version 4.7.0

$ g++ --versiong++ (GCC) 4.7.0 20120507 (Red Hat 4.7.0-5)Copyright (C) 2012 Free Software Foundation, Inc.This is free software; see the source for copying conditions.  There is NOwarranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

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Be aware that installing gcc and associated tools and libraries in this manner relies on the repository maintainer to keep their packages up to date.