先下载最新版的GCC

http://ftp.tsukuba.wide.ad.jp/software/gcc/releases/gcc-7.2.0/gcc-7.2.0.tar.xz

解压：

tar --xz  -xvf gcc-7.2.0.tar.xz

cd gcc-7.2.0

新手最多的问题是安装包的依赖问题，如下所示：

configure: error: Building GCC requires GMP 4.2+, MPFR 2.4.0+ and MPC 0.8.0+.

Try the --with-gmp, --with-mpfr and/or --with-mpc options to specify

their locations.  Source code for these libraries can be found at

their respective hosting sites as well as at

ftp://gcc.gnu.org/pub/gcc/infrastructure/.  See also

http://gcc.gnu.org/install/prerequisites.html for additional info.  If

you obtained GMP, MPFR and/or MPC from a vendor distribution package,

make sure that you have installed both the libraries and the header

files.  They may be located in separate packages.

而按照这些软件包，费事，配置还麻烦；其实GCC已经替我们想好了，只是大家不知道，

直接运行：

./contrib/download_prerequisites

所有相关的软件就按照好了！！！

然后就可以方便的编译了。

nohup ./configure --disable-multilib --prefix=$PWD/../gcc 1>log 2>err &

nohup make -j 3 1>m.log 2>m.err &

make install

然后大功告成！！