Python 3.3.0a3 build fails on MacOS 10.7 with XCode 4.3.2

[ThomasRobitaille]

BPO	14932
Nosy	@hynek
Superseder	bpo-13241: llvm-gcc-4.2 miscompiles Python (XCode 4.1 on Mac OS 10.7)
Files	python3.3_log

^{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 2012-05-28.11:39:52.642>
created_at = <Date 2012-05-28.10:57:52.104>
labels = ['build', 'expert-installation']
title = 'Python 3.3.0a3 build fails on MacOS 10.7 with XCode 4.3.2'
updated_at = <Date 2012-05-28.12:56:31.143>
user = 'https://bugs.python.org/ThomasRobitaille'

bugs.python.org fields:

activity = <Date 2012-05-28.12:56:31.143>
actor = 'hynek'
assignee = 'none'
closed = True
closed_date = <Date 2012-05-28.11:39:52.642>
closer = 'hynek'
components = ['Installation']
creation = <Date 2012-05-28.10:57:52.104>
creator = 'Thomas.Robitaille'
dependencies = []
files = ['25743']
hgrepos = []
issue_num = 14932
keywords = []
message_count = 4.0
messages = ['161765', '161769', '161771', '161777']
nosy_count = 2.0
nosy_names = ['hynek', 'Thomas.Robitaille']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '13241'
type = 'compile error'
url = 'https://bugs.python.org/issue14932'
versions = ['Python 3.3']

[ThomasRobitaille]

I can build Python 2.6 to 3.2 on MacOS 10.7 with XCode 4.3.2 using solely:

./configure
make

But if I do this with Python 3.3 alpha 3 I get the following error:

gcc   -framework CoreFoundation -o python.exe [Modules/python.o](https://github.com/python/cpython/blob/main/Modules/python.o) libpython3.3m.a -ldl  -framework CoreFoundation     
./python.exe -SE -m sysconfig --generate-posix-vars
Could not find platform dependent libraries <exec_prefix>
Consider setting $PYTHONHOME to <prefix>[:<exec_prefix>]
python.exe(92825) malloc: *** mmap(size=7310873954244194304) failed (error code=12)
*** error: can't allocate region
*** set a breakpoint in malloc_error_break to debug
Could not import runpy module
make: *** [[Lib/_sysconfigdata.py](https://github.com/python/cpython/blob/main/Lib/_sysconfigdata.py)] Segmentation fault: 11

The full log is attached.

[hynek]

Hello Thomas,

I presume your gcc is Apple's llvm-gcc (gcc --version output starts with "i686-apple-darwin11-llvm-gcc-4.2"), which is unfortunately a known to miscompile Python 3.3.

If you want to compile the latest Python 3.3 on OS X, use clang ("CC=clang ./configure" or "./configure CC=clang") which is also part of Apple's dev tools and works fine.

[ThomasRobitaille]

Thanks for the quick reply - wouldn't it make sense to add a directive to the configure script so that if the compiler matches 'i686-apple-darwin11-llvm-gcc-4.2', clang is used instead?

[hynek]

Have a look at bpo-13241 which is dedicated to this problem, especially at msg160081.