linux编译安装gcc-4.8.4

1、顺序安装三个依赖gmp、mpfr、mpc
（1）gmp
wget ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/infrastructure/gmp-4.3.2.tar.gz
tar -xvf gmp-4.3.2.tar.gz
cd gmp-4.3.2
mkdir /usr/local/gmp-4.3.2
./configure --prefix=/usr/local/gmp-4.3.2
make
make install

（2）mpfr
wget ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/infrastructure/mpfr-2.4.2.tar.bz2
tar -xvf mpfr-2.4.2.tar.bz2
cd mpfr-2.4.2
mkdir /usr/local/mpfr-2.4.2
./configure --prefix=/usr/local/mpfr-2.4.2 --with-gmp=/usr/local/gmp-4.3.2
make
make install

（3）mpc
wget ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/infrastructure/mpc-0.8.1.tar.gz
tar -xzvf mpc-0.8.1.tar.gz
cd mpc-0.8.1
mkdir /usr/local/mpc-0.8.1
./configure --prefix=/usr/local/mpc-0.8.1 --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2
make
make install

2、编译gcc
wget http://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-4.8.4/gcc-4.8.4.tar.gz
tar -xzvf gcc-4.8.4.tar.gz
cd gcc-4.8.4
mkdir /usr/local/gcc-4.8.4
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/gmp-4.3.2/lib/:/usr/local/mpfr-2.4.2/lib/:/usr/local/mpc-0.8.1/lib/
./configure --prefix=/usr/local/gcc-4.8.4 --enable-threads=posix --disable-checking --disable-multilib --enable-languages=c,c++ --with-gmp=/usr/local/gmp-4.3.2 --with-mpfr=/usr/local/mpfr-2.4.2 --with-mpc=/usr/local/mpc-0.8.1
make
make install
ln -s /usr/local/gcc-4.8.4/bin/gcc /usr/bin/gcc
ln -s /usr/local/gcc-4.8.4/bin/g++ /usr/bin/g++