Christian Hudon created ARROW-7041:
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Summary: PythonLibs setting found by CMake uses wrong version of
Python on macOS
Key: ARROW-7041
URL: https://issues.apache.org/jira/browse/ARROW-7041
Project: Apache Arrow
Issue Type: Bug
Reporter: Christian Hudon
I'm trying to build the Python library and run its tests, so to do that I need
to first build the C++ library. I'm going through the Python Development Guide
part of the docs. When invoking CMake to build the C++ library, it claims to
have found PythonLibs here:
-- Found PythonLibs:
/usr/local/Cellar/python@2/2.7.16_1/Frameworks/Python.framework/Versions/2.7/lib/libpython3.7m.dylib
Just by looking at the whole path, it doesn't look like a promising location.
And indeed, there's no libpython3.7*.dylib file in the Python 2.7 install
directory. So the C++ build fails.
I'm on macOS 10.14.6. I have Python 2.7 and 3.7 both installed via Homebrew.
(There is a libpython3.7*.dylib file in the Python 3.7 install of Homebrew.)
For the Python build dependencies, I have a Python 3.7 venv active and they are
installed there via pip. This happens with -DARROW_PYTHON=ON.
This definitely looks like whatever piece of CMake code that is trying to find
PythonLibs is grabbing the first directory it finds, and appending a path to
the dylib without looking if it exists. However, I don't know much of anything
about CMake. Any suggestion for a fix or at least a workaround to point CMake
to the PythonLibs directory that would make more sense?
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