From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?UTF-8?Q?Court=C3=A8s?=)
Subject: bug#30229: Python modules installed by pip in virtualenv can't find
	shared objects.
Date: Wed, 24 Jan 2018 16:01:42 +0100
Message-ID: <87k1w7xpux.fsf@gnu.org>
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	(Fis Trivial's message of "Tue, 23 Jan 2018 11:49:59 +0000")
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To: Fis Trivial <ybbs.daans@hotmail.com>
Cc: 30229@debbugs.gnu.org

Hi,

Fis Trivial <ybbs.daans@hotmail.com> skribis:

> In my case, it's lightgbm (installed by pip), needs libgomp.so from gcc:l=
ib for
> openmp support. Here is the backtrace:
>
> Traceback (most recent call last):
>   File "ex1.py", line 5, in <module>
>     import lightgbm as lgb
>   File "/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-=
packages/lightgbm/__init__.py", line 8, in <module>
>     from .basic import Booster, Dataset
>   File "/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-=
packages/lightgbm/basic.py", line 32, in <module>
>     _LIB =3D _load_lib()
>   File "/home/fis/Workspace/tianchi/medical_treatment/lib/python3.5/site-=
packages/lightgbm/basic.py", line 27, in _load_lib
>     lib =3D ctypes.cdll.LoadLibrary(lib_path[0])
>   File "/gnu/store/jb3n0bsdpkhvyb8y70jyr8fcx8fqssr9-python-3.5.3/lib/pyth=
on3.5/ctypes/__init__.py", line 425, in LoadLibrary
>     return self._dlltype(name)
>   File "/gnu/store/jb3n0bsdpkhvyb8y70jyr8fcx8fqssr9-python-3.5.3/lib/pyth=
on3.5/ctypes/__init__.py", line 347, in __init__
>     self._handle =3D _dlopen(self._name, mode)
> OSError: libgomp.so.1: cannot open shared object file: No such file or di=
rectory

I=E2=80=99d suggest hard-coding the absolute file name of libgomp.so.1 in
lightgbm/basic.py.

This is what we do, for instance, for Guile packages that use the
foreign function interface (FFI) and dynamically load shared libraries
(see =E2=80=98guile-gdbm-ffi=E2=80=99 as an example.)

HTH,
Ludo=E2=80=99.