[ARROW-2734] [Python] Cython api example doesn't work by default on macOS

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.11.0
• Component/s: Documentation, Python
• Labels: pull-request-available
• Environment: macOS 10.13
• External issue URL: https://github.com/apache/arrow/issues/19121
• Assignee: Krisztian Szucs
• Reporter: Jonathan Chambers
• Created: 24/Jun/18 11:18
• Updated: 11/Jan/23 07:22
• Resolved: 28/Aug/18 16:39

Description

The setup.py + example.pyx given in the docs:

https://arrow.apache.org/docs/python/extending.html#example

doesn't work on macOS.

 

The first issue is the error:

example.cpp:603:10: fatal error: 'unordered_map' file not found

because (AFAIU) macOS clang doesn't include the required C++11 lib by default.

This can be solved by adding: 

os.environ['CFLAGS'] = '-std=c++11 -stdlib=libc++'

to setup.py

 

The second issue is that the line

ext.library_dirs.append(pa.get_library_dirs())

should be  

ext.library_dirs.extend(pa.get_library_dirs())

 

otherwise this causes a (completely uninformative) typerror during the build because library dirs ends up being a list of list instead of a list of string.

 

Issue Links

• links to: GitHub Pull Request #2488