[issue21042] ctypes.util.find_library() should return full pathname instead of filename in linux

[Martin Panter]

Martin Panter added the comment:

Tamás, it might be a good idea for you to sign a contributor agreement <https://www.python.org/psf/contrib/contrib-form/>.

I compiled Python in 32-bit mode and tried your v2 patch out, which found the wrong library as I predicted. Then I tried your new regex and it picked out the correct line. I had to edit it to get it to extract just the filename from the line:

r'lib%s\.[^\s]+\s\(%s(?:,\s.*)?\)\s=>\s(.*)' % (re.escape(name), abi_type)

I factored out the closing bracket from the comma + space bit, moved the group brackets to the end to extract the filename, and made it a raw string.

Without the patch, in 32-bit mode it will find 64-bit-only libraries:

>>> find_library("m")  # 32- and 64-bit available
'libm.so.6'
>>> find_library("tcl8.6")  # Only 64-bit version available!
'libtcl8.6.so'

With my edited regex:

>>> find_library("m")
'/usr/lib32/libm.so.6'
>>> find_library("tcl8.6") is None  # No 32-bit version found
True

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21042>
_______________________________________