如何使用 brew 链接到新的 gcc 版本？

Question

我刚刚通过运行brew update 和brew upgrade 获得了一个新的gcc 版本。 brew 抱怨brew link 没有成功完成：

~
✓  brew upgrade
==> Upgrading 1 outdated package, with result:
gcc 4.8.2_1
==> Upgrading gcc
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/gcc-4.8.2_1
######################################################################## 100,0%
==> Pouring gcc-4.8.2_1.mavericks.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
You can try again using:
  brew link gcc

Possible conflicting files are:
/usr/local/bin/gfortran -> /usr/local/Cellar/gfortran/4.8.2/bin/gfortran
/usr/local/share/man/man1/gfortran.1 -> /usr/local/Cellar/gfortran/4.8.2/share/man/man1/gfortran.1 

所以我手动运行brew link gcc：

~
✓  brew link gcc
Linking /usr/local/Cellar/gcc/4.8.2... 25 symlinks created

现在当我告诉 brew 清理时，我收到以下警告：

~
✓  brew cleanup
Warning: Skipping (old) /usr/local/Cellar/gcc/4.8.2 due to it being linked

我的酒窖里有两个 gcc 版本：

~
✓  ls /usr/local/Cellar/gcc
4.8.2   4.8.2_1

两个都需要吗？我想删除旧版本。我怎样才能做到这一点？

Answer 1

我通过运行以下命令解决了它

brew unlink gcc
brew rm gfortran
brew cleanup
brew link gcc

gfortran 似乎链接到了旧的 gcc 版本。