Ned Deily added the comment:
This is a regression from previous releases of Python. It was introduced by
fbe87fb071a6 (for Issue22038) which added the use of C built-in functions for
atomic memory access for additional architectures like x86_64. It seems that
the relatively early version of Apple's clang included with Xcode 4 fails
compiling this code. The specific clang version that failed ("Apple LLVM
version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)") is the version included
with the last shipped version of Xcode 4, Xcode 4.6.3, for OS X 10.7 and 10.8.
For OS X 10.8, there is available a more recent version of Xcode, Xcode 5.1.1,
which includes a new version of clang, "Apple LLVM 5.1 (clang-503.0.40)", which
does correctly compile this code. In general, we always recommend using the
most recent available version of Xcode- or Command Line Tools-installed build
tools for a particular version of OS X (with the notable exception of OS X 10.6
- stick with Xcode 3.2.6 there). So upgrading to Xcode 5.1.1 on
OS X 10.8.5 should solve the problem there. Unfortunately, for OS X 10.7.x,
Xcode 4.6.3 is the most recent version and Xcode 4 has always been somewhat
problematic for Python builds. It was in Xcode 4 that Apple stopped shipping
the "native" gcc-4.2 compiler in favor of clang and the hybrid Apple
llvm-gcc-4.2 compiler (which uses gcc as the front end and LLVM as the
backend). The llvm-gcc-4.2 compiler was a transitional tool, not
well-maintained, and is known to incorrectly compile recent versions of Python
3 (Issue13241) so it cannot be used as a substitute for clang in this case on
OS X 10.7 (it was no longer shipped as of Xcode 5).
Support for OS X 10.8 is much more important than OS X 10.7: I doubt there are
*that* many users are still on 10.7. So I think a case could be made for
marking this as "won't fix". On the other hand, it should be possible to add
tests to ./configure to skip trying to use the atomic builtins when this
compiler is in use.
----------
nosy: +haypo, larry
title: Python 3.5rc1 compilation error on OS X 10.8 -> Python 3.5rc1
compilation error with Apple clang 4.2 included with Xcode 4
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