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​

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