问题
rvm install 1.9.3 --with-gcc=clang (as suggested by Can't install Ruby under Lion with RVM – GCC issues) doesn't work because neither Mac OS X 10.8.2 (Mountain Lion) nor Xcode 4.5 comes with clang.
Is it possible to compile Ruby with llvm?
According to Matthias Schmidt's "How to install Ruby 1.9.3 on Mac OS X with LLVM and rbenv", Ruby is now fully compatible with LLVM.
But, I still get: error: C compiler cannot create executables
UPDATE:
Actually, I found clang here /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang (thanks to the Node.js Installation Wiki). I just didn't have clang in my path.
So, if I add clang to my path, is rvm install 1.9.3 --with-gcc=clang sufficient?
回答1:
no, ruby is not fully compatible with llvm, there is at least one issue with Fibers and other issues might occur if version of llvm changes.
Ruby works best with gcc-4.2, rvm provides information how to get it (+other important stuff):
rvm requirements
回答2:
From RVM notes:
Homebrew:
If you are using Homebrew, you can install the apple-gcc42 and required libraries from homebrew/dupes:
brew update
brew tap homebrew/dupes
brew install autoconf automake apple-gcc42
rvm pkg install openssl
This can live side by side with an existing Xcode 4.2+ install or Command Line Tools for Xcode.
osx-gcc-installer:
If you don't use Homebrew, you can download and install osx-gcc-installer:
https://github.com/kennethreitz/osx-gcc-installer.
Hope it will help you.
回答3:
I used this: http://railsinstaller.org/mac - and it was a BREEZE. Also I like the sublime text editor, found that through this resource... Maybe I'll say goodbye to macvim! Imagine that.
来源：https://stackoverflow.com/questions/12604119/install-ruby-with-mountain-lion-xcode-4-5-and-rvm