64 lines
2.8 KiB
Python
64 lines
2.8 KiB
Python
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""" Distributor init file
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Distributors: you can add custom code here to support particular distributions
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of scipy.
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For example, this is a good place to put any checks for hardware requirements.
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The scipy standard source distribution will not put code in this file, so you
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can safely replace this file with your own version.
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"""
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import os
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# on Windows SciPy loads important DLLs
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# and the code below aims to alleviate issues with DLL
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# path resolution portability with an absolute path DLL load
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if os.name == 'nt':
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from ctypes import WinDLL
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import glob
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# convention for storing / loading the DLL from
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# scipy/.libs/, if present
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libs_path = os.path.abspath(os.path.join(os.path.dirname(__file__),
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'.libs'))
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if os.path.isdir(libs_path):
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# for Python >= 3.8, DLL resolution ignores the PATH variable
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# and the current working directory; see release notes:
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# https://docs.python.org/3/whatsnew/3.8.html#bpo-36085-whatsnew
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# Only the system paths, the directory containing the DLL, and
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# directories added with add_dll_directory() are searched for
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# load-time dependencies with Python >= 3.8
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# this module was originally added to support DLL resolution in
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# Python 3.8 because of the changes described above--providing the
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# absolute paths to the DLLs allowed for proper resolution/loading
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# however, we also started to receive reports of problems with DLL
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# resolution with Python 3.7 that were sometimes alleviated with
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# inclusion of the _distributor_init.py module; see SciPy main
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# repo gh-11826
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# we noticed in scipy-wheels repo gh-70 that inclusion of
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# _distributor_init.py in 32-bit wheels for Python 3.7 resulted
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# in failures in DLL resolution (64-bit 3.7 did not)
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# as a result, we decided to combine both the old (working directory)
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# and new (absolute path to DLL location) DLL resolution mechanisms
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# to improve the chances of resolving DLLs across a wider range of
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# Python versions
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# we did not experiment with manipulating the PATH environment variable
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# to include libs_path; it is not immediately clear if this would have
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# robustness or security advantages over changing working directories
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# as done below
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# we should remove the working directory shims when our minimum supported
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# Python version is 3.8 and trust the improvements to secure DLL loading
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# in the standard lib for Python >= 3.8
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try:
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owd = os.getcwd()
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os.chdir(libs_path)
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for filename in glob.glob(os.path.join(libs_path, '*dll')):
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WinDLL(os.path.abspath(filename))
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finally:
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os.chdir(owd)
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