CentOS 6.5 Upgrade GCC 4.9.1

CentOS the GCC version is too low and my system is gcc-4.7.7 and needs to be upgraded.

1. Download gcc 4.9.1 source code

URL: http://www.linuxfromscratch.org/blfs/view/svn/general/gcc.html

wget http://ftp.gnu.org/gnu/gcc/gcc-4.9.1/gcc-4.9.1.tar.bz2

2. Extract source code

Tar jxvf gcc-4.9.1.tar.bz2

3. Installation Environment Establishment

GCC has a self-contained script that automatically helps you download the dependent libraries that you need, which is recommended, otherwise you may have a version incompatibility problem with your downloaded library.

CD gcc-4.9.1
./contrib/download_prerequisites 

4. Create a compiled file directory

CD..
mkdir Gcc-build

5. Enter gcc-build and generate makefile files

.. /gcc-4.9.1/configure--enable-checking=release--enable-languages=c,c++  --disable-multilib

6. Modifying environment variables

Export Ld_library_path= $LD _library_path:/usr/local/lib

7. Compiling the installation

Make-j4 make
Install

After the compilation is successful, view the GCC version as 4.9.1 with Gcc-v.

Reference Document: http://plutopalace.blog.com/2014/03/28/centos-compile-install-gcc/

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