STINNER Victor <victor.stin...@haypocalc.com> added the comment:

I asked for more information about llvm-gcc on IRC (#llvm). Extracts:

 - "llvm-gcc is not maintained." ("Clang and DragonEgg are.) "Apple is the 
maintainer of Apple's version of llvm-gcc and clang."
 - "Apple ships a [llvm-gcc] branch at a random point in svn + some bug fixes, 
not a proper release."
 - "llvm-gcc is Apple's GCC (which was never sync'd with mainline past 4.2.1 
because the FSF changed the license) with LLVM on the back end."
 - llvm-gcc-4.5 in Ubuntu 10.10 is not llvm-gcc, it's dragonegg, a new project

If I understood correctly, llvm-gcc is only the default C compiler of Xcode 
4.1. I don't think that you should workaround llvm-gcc bugs. If you are using 
Xcode 4.1, you can compile Python with clang. clang is a different C compiler 
and it doesn't have the bug.

----------
title: llvm-gcc-4.2 miscompiles Python (XCode 4.1+ on Mac OS 10.7) -> 
llvm-gcc-4.2 miscompiles Python (XCode 4.1 on Mac OS 10.7)

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