distutils fails to build C extensions with XCode 5.1 and OS X 10.9 (Mavericks)

[kfrazier]

BPO	21244
Nosy	@jaraco, @ned-deily, @merwok, @dstufft
Files	toysetup.py: Simplified setup.py file to demonstrate the issue

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2014-04-16.01:37:06.888>
created_at = <Date 2014-04-15.19:16:26.860>
labels = ['library']
title = 'distutils fails to build C extensions with XCode 5.1 and OS X 10.9 (Mavericks)'
updated_at = <Date 2014-04-16.01:37:06.868>
user = 'https://bugs.python.org/kfrazier'

bugs.python.org fields:

activity = <Date 2014-04-16.01:37:06.868>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2014-04-16.01:37:06.888>
closer = 'ned.deily'
components = ['Distutils']
creation = <Date 2014-04-15.19:16:26.860>
creator = 'kfrazier'
dependencies = []
files = ['34889']
hgrepos = []
issue_num = 21244
keywords = []
message_count = 2.0
messages = ['216363', '216418']
nosy_count = 5.0
nosy_names = ['jaraco', 'ned.deily', 'eric.araujo', 'kfrazier', 'dstufft']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue21244'
versions = ['Python 2.7']

[kfrazier]

Using the stock Python shipped by Apple with OS X 10.9 Mavericks and XCode 5.1, Mercurial (and other Python extensions) encounter an error like:

cc -fno-strict-aliasing -fno-common -dynamic -g -Os -pipe -fno-common -fno-strict-aliasing -fwrapv -mno-fused-madd -DENABLE_DTRACE -DMACOSX -DNDEBUG -Wall -Wstrict-prototypes -Wshorten-64-to-32 -DNDEBUG -g -fwrapv -Os -Wall -Wstrict-prototypes -DENABLE_DTRACE -pipe -I/System/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 -c mercurial/base85.c -o /private/var/folders/qv/tv81r5_9119bs3jwj3g2rp540000gn/T/hgtests._a6HZj/build/temp.macosx-10.9-intel-2.7/mercurial/base85.o
clang: error: unknown argument: '-mno-fused-madd' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
error: command 'cc' failed with exit status 1
make: *** [tests] Error 1

This can be worked around with:

export CFLAGS=-Qunused-arguments

On my machine, Python was build with clang-500.0.68 and the XCode 5.1 updates it to clang-503.0.40. I will include a simple setup.py that can be run against Mercurial's head to demonstrate the issue.

[ned-deily]

This is a problem specifically with the Apple-supplied system Pythons in OS X 10.9. It's due to the obsolete configuration parameters used in their build of Python and due to changes in Xcode 5.1. Expect Apple to fix it in an upcoming maintenance release of OS X 10.9.x.