I'd like to install the latest clang (3.1) compiler using macports (I use emacs rather than xcode, and the version of clang that comes with xcode is older anyway). macports seems to have the latest versions of gcc, but when I enter "port list clang" the only version that shows up is 2.9. I use the C++11 features, so I want to use the latest version.
I'm running snow leopard on an MBP.
Clang has several different versions available on MacPorts:
$ port search clang
clang @2.9 (lang)
C, C++, Objective C and Objective C++ compiler
clang-2.9 @2.9 (lang)
C, C++, Objective C and Objective C++ compiler
clang-3.0 @3.0 (lang)
C, C++, Objective C and Objective C++ compiler
clang-3.1 @3.1-r154872 (lang)
C, C++, Objective C and Objective C++ compiler
clang-devel @3.0 (lang)
C, C++, Objective C and Objective C++ compiler
clang_select @0.1 (sysutils)
common files for selecting default clang version
Found 6 ports.
So if you just install the clang port, it'll install version 2.9. If you want 3.1, install the clang-3.1 port. You can also install clang_select, which is a utility that allows you to easily switch between multiple installations of Clang; without it, you have to manually specify the version of the Clang binary you want each time.
Just specify the version number:
port list clang-3.1
Worked fine for me. I'm on Lion, but I don't see why that would make a difference.
Since the macports repository appears to not have the latest clang, I suggest building clang from source and then proceeding to make a new macports package.
来源：https://stackoverflow.com/questions/10368617/how-to-install-clang-3-1-using-macports-osx-snow-leopard