Weird Install Error: wxPython

[jazzcat2]

Greetings,

I have a weird error whenever I try to run any of the wxPython demos,
after compiling the packages from source.

This is a CentOS 4.3 install.  I'm very particular where everything goes
so as not to run into any OS-supplied components.

Python is here: /opt/Python-2.4.3
wxWidgets is here: /opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly  (as
compiled from the wxPython sources)

After building and installing wxWidgets, I built wxPython like so:

/opt/Python-2.4.3/bin/python ./setup.py build_ext --debug
WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config
UNICODE=1

Then, I installed it like this:

/opt/Python-2.4.3/bin/python ./setup.py install
WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config

And, when I try to run a demo, I get this error:

/opt/Python-2.4.3/bin/python ./Notebook.py
Traceback (most recent call last):
   File "./Notebook.py", line 4, in ?
     import  wx
   File
"/opt/Python-2.4.3/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/__init__.py",
line 42, in ?
     from wx._core import *
   File
"/opt/Python-2.4.3/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/_core.py",
line 4, in ?
     import _core_
ImportError: libwx_gtk2d_xrc-2.6.so.0: cannot open shared object file:
No such file or directory

Any idea what's going on here?

Thanks,
-Josh

[Robin Dunn]

Joshua Kramer wrote:

> Greetings,
>
> I have a weird error whenever I try to run any of the wxPython demos,
> after compiling the packages from source.
>
> This is a CentOS 4.3 install.  I'm very particular where everything goes
> so as not to run into any OS-supplied components.
>
> Python is here: /opt/Python-2.4.3
> wxWidgets is here: /opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly  (as
> compiled from the wxPython sources)
>
> After building and installing wxWidgets, I built wxPython like so:
>
> /opt/Python-2.4.3/bin/python ./setup.py build_ext --debug
> WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config
> UNICODE=1
>
> Then, I installed it like this:
>
> /opt/Python-2.4.3/bin/python ./setup.py install
> WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config
>
> And, when I try to run a demo, I get this error:
>
> /opt/Python-2.4.3/bin/python ./Notebook.py
> Traceback (most recent call last):
>   File "./Notebook.py", line 4, in ?
>     import  wx
>   File
> "/opt/Python-2.4.3/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/__init__.py",
> line 42, in ?
>     from wx._core import *
>   File
> "/opt/Python-2.4.3/lib/python2.4/site-packages/wx-2.6-gtk2-ansi/wx/_core.py",
> line 4, in ?
>     import _core_
> ImportError: libwx_gtk2d_xrc-2.6.so.0: cannot open shared object file:
> No such file or directory
>
> Any idea what's going on here?

By default the path to the wx shared libs is not embedded in the
wxPython extension modules, so the dynamic loader will just look in the
standard paths and in any paths specified by the LD_LIBRARY_PATH
environment variable.  You can either set that variable to include
/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib, add the path to
/etd/ld.so.conf and rerun ldconfig, or rebuild wxPython giving the
--rpath=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib option to the
build_ext setup command.


--
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!

[jazzcat2]

> environment variable.  You can either set that variable to include
> /opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib, add the path to
> /etd/ld.so.conf and rerun ldconfig, or rebuild wxPython giving the
> --rpath=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib option to the
> build_ext setup command.

Excellent, thanks for the help.  Now, the question is this: why is the
wxPython NOT looking for Unicode wxWidgets libs?  All of my wx libs are
Unicode, I think; for example wxPython looks for

libwx_gtk2d_xrc-2.6.so.0

when I really have

libwx_gtk2ud_xrc-2.6.so.0

As I can see from the line I supplied above, I am enabling Unicode by
setting UNICODE=1 on the build command line:

/opt/Python-2.4.3/bin/python ./setup.py build_ext --debug
WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config
UNICODE=1

Any ideas?

Thanks,
-Josh

[Robin Dunn]

Joshua Kramer wrote:

>> environment variable.  You can either set that variable to include
>> /opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib, add the path to
>> /etd/ld.so.conf and rerun ldconfig, or rebuild wxPython giving the
>> --rpath=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/lib option to the
>> build_ext setup command.
>
> Excellent, thanks for the help.  Now, the question is this: why is the
> wxPython NOT looking for Unicode wxWidgets libs?  All of my wx libs are
> Unicode, I think; for example wxPython looks for
>
> libwx_gtk2d_xrc-2.6.so.0
>
> when I really have
>
> libwx_gtk2ud_xrc-2.6.so.0
>
> As I can see from the line I supplied above, I am enabling Unicode by
> setting UNICODE=1 on the build command line:
>
> /opt/Python-2.4.3/bin/python ./setup.py build_ext --debug
> WX_CONFIG=/opt/Python-2.4.3/wxWidgets-2.6.3-PythonOnly/bin/wx-config
> UNICODE=1

Near the begining of setup.py's output there is a line that starts with
"Using flags:"  What is the rest of the line?  What do you get if you
run "wx-config --list " + those flags?

--
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!

[jazzcat2]

> Near the begining of setup.py's output there is a line that starts with
> "Using flags:"  What is the rest of the line?  What do you get if you
> run "wx-config --list " + those flags?

Actually, I was able to fix this by setting UNICODE=1 in the config.py
file... now things work as they should!

Thanks again for the help.

Cheers,
-Josh

[jazzcat2]

> ImportError: libwx_gtk2d_xrc-2.6.so.0: cannot open shared object file: No
> such file or directory

Ok, I got past that error.  Now, whenever I try to run an app using
wxWidgets, I get this traceback:

Traceback (most recent call last):
   File "./SPE.py", line 48, in ?
     import ConfigParser, sys, os, wx
   File
"/opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/__init__.py",
line 45, in ?
     from wx._core import *
   File
"/opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/_core.py",
line 4, in ?
     import _core_
ImportError:
/opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/_core_.so:
undefined symbol: PyUnicodeUCS2_FromEncodedObject

I've searched the entire source tree for the symbol, and the only place
it's present is _core_.so .  How do I resolve or get rid of the reference
to this symbol?

Thanks,
-J

[Robin Dunn]

Josh wrote:

>
>> ImportError: libwx_gtk2d_xrc-2.6.so.0: cannot open shared object file:
>> No such file or directory
>
> Ok, I got past that error.  Now, whenever I try to run an app using
> wxWidgets, I get this traceback:
>
> Traceback (most recent call last):
>   File "./SPE.py", line 48, in ?
>     import ConfigParser, sys, os, wx
>   File
> "/opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/__init__.py",
> line 45, in ?
>     from wx._core import *
>   File
> "/opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/_core.py",
> line 4, in ?
>     import _core_
> ImportError:
> /opt/Python-2.4.4-OR-EL5/lib/python2.4/site-packages/wx-2.8-gtk2-unicode/wx/_core_.so:
> undefined symbol: PyUnicodeUCS2_FromEncodedObject
>
> I've searched the entire source tree for the symbol, and the only place
> it's present is _core_.so .  How do I resolve or get rid of the
> reference to this symbol?

Any time there is a missing UCS2 or UCS4 symbol it usually means that
you are running with a different Python than what wxPython (or other
extension module) was built with, and that the two Pythons had different
configure options when they were built.  One had --enable-unicode=ucs4
and one had --enable-unicode=ucs2.


--
Robin Dunn
Software Craftsman
http://wxPython.org  Java give you jitters?  Relax with wxPython!