centos 7.2 源碼安裝 gcc 8.2

sudo yum install glibc-devel bison flex texinfo build-essential

wget http://ftp.gnu.org/gnu/gcc/gcc-8.2.0/gcc-8.2.0.tar.xz

tar -xf gcc-8.2.0.tar.xz

cd gcc-8.2.0/

./contrib/download_prerequisites

tar -xf ./isl-0.18.tar.bz2

tar -xf ./mpc-1.0.3.tar.gz

tar -xf ./mpfr-3.1.4.tar.bz2

tar -xf ./gmp-6.1.0.tar.bz2

mkdir gcc-build

cd $_

../configure -enable-checking=release -enable-language=c,c++ -disable-multilib

make

sudo make install

完成以後如果g++編譯報錯：  error trying to exec 'cc1plus'   退出當前shell，重新登錄進來就OK了(check辦法：which gcc/which g++/gcc -v/g++ -v)