在 2018/5/5 20:13, 夏晗 写道:
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'.......
If you are using Ubuntu, the command `gcc` is a symlink to whichever version selected by your Ubuntu release and is the one used to build all system packages. Consequently, using a different target might result in binary incompatibility and is not recommended.
If you would like to invoke a different version of GCC, append the version number to it. This is true for all official releases and PPA packages.
For example, to invoke GCC 7 explicitly, you have to ensure it is installed by running `sudo apt-get install gcc-7`. The command `gcc-7` will be available thereafter and can be invoked either directly or indirectly by setting the `CC` environment variable.
-- Best regards, LH_Mouse
