GLIBCXX_3.4.9 cannot be found

1:manually download prerequisites
required package info can be found at contrib/download_prerequisites
2:compile prerequisites with static library (enable static and disable shared )
GMP, MPFR, MPC
3:compile gcc with shared library (please refer options to gcc -v command)
4:use LD_PRELOAD to load proper libstdc++ to start program

debug: strings libstdc++ |grep GLIBC