yum -y install bzip2 make gcc gcc-c++

cd /data0/cmake/gcc-9.2.0

./contrib/download_prerequisites

mkdir build && cd build && ../configure --prefix=/data0/gcc -enable-checking=release -enable-languages=c,c++,objc,obj-c++ -disable-multilib --enable-bootstrap --enable-threads=posix

make -j4 && make install

reboot

mkdir -p /data0/gcc/bak && mv /usr/bin/gcc /data0/gcc/bak/gcc
mv /usr/bin/g++ /data0/gcc/bak/g++
mv /usr/bin/c++ /data0/gcc/bak/c++
mv /usr/bin/cc /data0/gcc/bak/cc
mv /usr/lib64/libstdc++.so.6 /data0/gcc/bak/libstdc++.so.6

ln -s /data0/gcc/bin/gcc /usr/bin/gcc
ln -s /data0/gcc/bin/g++ /usr/bin/g++
ln -s /data0/gcc/bin/c++ /usr/bin/c++
ln -s /data0/gcc/bin/gcc /usr/bin/cc
cp /data0/gcc/lib64/libstdc++.so.6.0.27 /usr/lib64
cd /usr/lib64
ln -s libstdc++.so.6.0.27 libstdc++.so.6

strings /usr/lib64/libstdc++.so.6 | grep GLIBC

gcc -v