Ned Deily <n...@acm.org> added the comment:

>Note that apple have made gcc available, as part of command line tools >for 
>XCode, freely (free developer registration required though) from:
> https://developer.apple.com/downloads
>See: 
>http://kennethreitz.com/xcode-gcc-and-homebrew.html

No. The new version of Xcode (Xcode 4.3, released last week) referred to in 
that post does *not* make gcc-4.2 available again.  Like Xcode 4.2, it only 
includes clang and llvm-gcc; 4.3 includes updated versions of each of the two. 
gcc-4.2 was removed starting with 4.2 and there is no indication that Apple 
intends to re-instate it. Besides the compiler updates, Xoode 4.3 has been 
significantly repackaged, including the ability to download and install its 
components in smaller sub-packages, instead of the monolithic large downloads 
of recent past releases.  However, Xcode 4.3 has moved the install location of 
components like the SDKs (which are used by Python universal builds) from 
/Developer to within the new Xcode application bundle 
(/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer);
 this change will require additional changes to the Python build and 
Distutils/packaging infrastructure to support properly.  For now, the easiest 
workaround when installing 
 Xcode 4.3 and removing previous versions is to create a symlink from the app 
bundle Developer directory above to /Developer.  I will be testing the new 
compiler versions shortly and working on more general support for 4.3.

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