[Nexus] Bug in python bindings: napi.py does not find libNeXus.so.0 on x86_64 systems
Tobias.Richter at diamond.ac.uk
Tobias.Richter at diamond.ac.uk
Thu Apr 11 19:17:12 BST 2013
The patch looks good. I've committed it ( http://trac.nexusformat.org/code/changeset/1893 ) and we'll give it a test.
Thanks for that contribution!
From: nexus-bounces at nexusformat.org [nexus-bounces at nexusformat.org] on behalf of Rolf Krahl [rolf.krahl at helmholtz-berlin.de]
Sent: 11 April 2013 18:34
To: nexus at nexusformat.org
Subject: [Nexus] Bug in python bindings: napi.py does not find libNeXus.so.0 on x86_64 systems
I just installed NeXus 4.3.0 on a Linux x86_64 system and I believe
that I found a bug in the Python bindings.
Even trivial Python programs using the NeXus API fail with an error
message that libNeXus.so.0 cannot be found:
$ python -c "import nxs"
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/usr/lib64/python2.7/site-packages/nxs/__init__.py", line 20, in <module>
from nxs.napi import *
File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 268, in <module>
nxlib = _init()
File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 263, in _init
lib = _libnexus()
File "/usr/lib64/python2.7/site-packages/nxs/napi.py", line 260, in _libnexus
raise OSError, "Set NEXUSLIB or move NeXus to one of: %s"%(", ".join(files))
OSError: Set NEXUSLIB or move NeXus to one of: /usr/lib64/python2.7/site-packages/nxs/libNeXus.so.0, /usr/lib/libNeXus.so.0, /usr/local/lib/libNeXus.so.0, /usr/lib/libNeXus.so.0
The NeXus API searches its lib in the following places in order:
- directory containing napi.py
where PREFIX is set by configure during install, /usr in my case. The
directory containing napi.py was /usr/lib64/python2.7/site-packages/nxs
here. The environment variables NEXUSLIB and LD_LIBRARY_PATH have not
been set. This boils the search patch down to
/usr/lib64/python2.7/site-packages/nxs, /usr/lib, /usr/local/lib,
But the lib has been installed as /usr/lib64/libNeXus.so.0 by make
install and that is exactly the place where it should be on a 64 bit
system. So napi.py should have looked in /usr/lib64.
Rather then in PREFIX/lib, /usr/local/lib, /usr/lib, napi.py should
look in LIBDIR as set by configure. That is the directory where it
gets installed by make install. See the attached patch.
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