1.下载

https://mirrors.tuna.tsinghua.edu.cn/gnu/gcc/gcc-8.4.0/

2.解压

tar zxvf gcc-8.4.0.tar.gz
cd gcc-8.4.0

3.下载依赖

./contrib/download_prerequisites

4.创建编译文件夹

mkdir bulidgcc
cd buildgcc

5.编译安装

../configure -enable-checking=release -enable-languages=c,c++ -disable-multilib --prefix=/path/gcc
make
make install

6.环境变量

#gcc
export gcchome=/path/gcc
export PATH=$gcchome/bin:$PATH
export PATH=$gcchome/lib:$PATH
export PATH=$gcchome/lib64:$PATH
export LD_LIBRARY_PATH=$gcchome/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$gcchome/lib64:$LD_LIBRARY_PATH
export LIBRARY_PATH=$gcchome/lib:$LIBRARY_PATH
export LIBRARY_PATH=$gcchome/lib64:$LIBRARY_PATH
export PATH=$gcchome/include:$PATH
export LD_LIBRARY_PATH=$gcchome/include:$LD_LIBRARY_PATH
export LIBRARY_PATH=$gcchome/include:$LIBRARY_PATH