Appears to install correctly but will throw ImportError

[jozzas]

I'm having some trouble getting pybullet to run correctly after installing. I still believe it's a simple path problem and I'm being stupid, but maybe I've missed an installation step or something obvious that wasn't documented.

My configuration:

Ubuntu 10.04
Python 2.6.5
Bullet 2.8.1
PyBullet trunk (r54)
numpy 1.6.0

I have built and installed bullet, and can successfully run the demos that come with it.

I have successfully built and installed pybullet, but when trying to run any of the demos, I get the following error:

>> python helloworld.py
Traceback (most recent call last):
  File "helloworld.py", line 4, in <module>
    from bullet.bullet import (
ImportError: libBulletSoftBody.so.0: cannot open shared object file: No such file or directory

When running test_bullet.py from /usr/local/lib/python2.6/dist-packages/bullet, I get the following output (not sure if relevant):

>> python test_bullet.py
test_bullet.py:13: RuntimeWarning: numpy.dtype size changed, may indicate binary incompatibility
  from bullet import (
test_bullet.py:13: RuntimeWarning: numpy.flatiter size changed, may indicate binary incompatibility
  from bullet import (

I have confirmed that:

/usr/local/lib (the location of the .so and .so.0 files for bullet) is in my .bashrc, and is definitely in my python path:

import sys
sys.path

(Output contains /usr/local/lib)

I have tried copying the bullet .so and .so.0 files directly to various other locations: the pybullet dist-packages folder, the dist-packages folder itself, to no avail.

How can I get pybullet to see my valid install of bullet?

Cheers!

[jozzas (jozzas)]

I should probably mention the build command that I issue and the result:

python setup.py build_ext --include-dirs /home/path-to-bullet/bullet-2.81-rev2613/src/ --library-dirs /usr/local/lib
running build_ext
skipping 'bullet/bullet.cpp' Cython extension (up-to-date)
building 'bullet.bullet' extension
creating build/temp.linux-x86_64-2.6
creating build/temp.linux-x86_64-2.6/bullet
gcc -pthread -fno-strict-aliasing -DNDEBUG -g -fwrapv -O2 -Wall -Wstrict-prototypes -fPIC -I/home/lyonj/Downloads/bullet-2.81-rev2613/src/ -I/usr/include/python2.6 -c bullet/bullet.cpp -o build/temp.linux-x86_64-2.6/bullet/bullet.o
cc1plus: warning: command line option "-Wstrict-prototypes" is valid for Ada/C/ObjC but not for C++
bullet/bullet.cpp: In function ‘PHY_ScalarType __pyx_f_6bullet_6bullet_11IndexedMesh__dtypeToScalarType(__pyx_obj_6bullet_6bullet_IndexedMesh*, PyArrayObject*)’:
bullet/bullet.cpp:4756: warning: ‘__pyx_r’ may be used uninitialized in this function
/usr/include/python2.6/numpy/__multiarray_api.h: At global scope:
/usr/include/python2.6/numpy/__multiarray_api.h:968: warning: ‘int _import_array()’ defined but not used
/usr/include/python2.6/numpy/__ufunc_api.h:182: warning: ‘int _import_umath()’ defined but not used
creating build/lib.linux-x86_64-2.6
creating build/lib.linux-x86_64-2.6/bullet
g++ -pthread -shared -Wl,-O1 -Wl,-Bsymbolic-functions build/temp.linux-x86_64-2.6/bullet/bullet.o -L/usr/local/lib -lBulletSoftBody -lBulletDynamics -lBulletCollision -lLinearMath -o build/lib.linux-x86_64-2.6/bullet/bullet.so

Seems to build and link okay, but maybe the linking isn't working?

[jozzas (jozzas)]

I copied the .so and .so.0 files from bullet to /usr/lib, re-ran the linking command manually (last bit above) and it's now working! Sorry for clogging up the bugs section, I'm sure I did something wrong in providing the library path to setup.py.

[Jean-Paul Calderone (exarkun)]

For the record, if your libraries are in /usr/local/lib then you probably also need to set LD_LIBRARY_PATH to include that directory at runtime in order for them to be found.