Centos 6.9 编译install gcc-4.9.4

依赖gcc
yum install gcc gcc-c++  libgcc.i686 glibc-devel.i686 -y

下载gcc
wget http://ftp.gnu.org/gnu/gcc/gcc-4.9.4/gcc-4.9.4.tar.bz2

解压gcc
tar -xvf gcc-4.9.4.tar.bz2

cd gcc-gcc-4.9.4
./contrib/download_prerequisites  下载依赖项或者离线下载
wget http://ftp.vim.org/languages/gcc/infrastructure/mpc-1.0.3.tar.gz
wget http://ftp.vim.org/languages/gcc/infrastructure/mpfr-3.1.4.tar.bz2
wget http://ftp.vim.org/languages/gcc/infrastructure/gmp-4.3.2.tar.bz2
wget http://ftp.vim.org/languages/gcc/infrastructure/cloog-0.18.1.tar.gz
wget http://ftp.vim.org/languages/gcc/infrastructure/isl-0.14.tar.bz2

cd gcc-4.9.4（全部解压到目录编译安装一下)
tar -xvf gmp-4.3.2.tar.bz2
cd /gcc-4.9.4/gmp-4.3.2
./configure
make && make install

tar -zxvf cloog-0.18.1.tar.gz
cd /gcc-4.9.4/cloog-0.18.1
./configure
make && make install

tar -xvf isl-0.14.tar.bz2
cd /gcc-4.9.4/isl-0.14
./configure
make && make install

tar -xvf mpfr-3.1.4.tar.bz2
cd /gcc-4.9.4/mpfr-3.1.4
./configure
make && make install

tar -zxvf mpc-1.0.3.tar.gz
cd /gcc-4.9.4/mpc-1.0.3
./configure
make && make install

/root下建立编译输出目录
mkdir gcc-build-4.9.4

进入输出目录，执行命令，并生成makefile
cd gcc-build-4.9.4
../gcc-4.9.4/configure --enable-checking=release --enable-languages=c,c++ --disable-multil
make && make install

查看版本
gcc -v    g++ -v  或者 gcc --version   g++ --version

检查动态库：
strings /usr/lib64/libstdc++.so.6 | grep GLIBC