On Sat, May 5, 2018 at 5:13 AM, 夏晗 <xia...@tju.edu.cn> wrote: > root@Xia-Ubuntu:/usr/bin# gcc -v > 使用内建 specs。 > COLLECT_GCC=gcc > 目标:x86_64-pc-linux-gnu > 配置为:../configure -enable-checking=release -enable-languages=c,c++ > -disable-multilib > 线程模型:posix > gcc 版本 6.2.0 (GCC) > I have tried many methods like 'ln' and priority changing, but 'gcc -v' > still maintain at '6.2.0'.....
perhaps which -a gcc will provide a clue