Guido van Rossum wrote:
>
> (There's a linux question at the bottom.)
>
> > > I decided to build the simple embedding demo in Demo/embed/. After
> > > fixing the Makefile (checkins coming), I ended up with one problem:
> > > the 'import site.py' failed error. When using -v I get this traceback:
> > >
> > > 'import site' failed; traceback:
> > > Traceback (most recent call last):
> > > File "/usr/local/lib/python2.0/site.py", line 146, in ?
> > > sys.setdefaultencoding('ascii')
> > > LookupError: no codec search functions registered: can't find encoding
> > >
> > > Is there some part of the initialization that I'm forgetting?
> >
> > Looks like the 'import encodings' failed. Could you check this
> > with -vv ?
>
> Thanks for the hint. Seems I've got it nailed down: it's looking for
> the struct module:
>
> [...]
> import codecs # precompiled from /usr/local/lib/python2.0/codecs.pyc
> # trying /usr/local/lib/python2.0/struct.so
> # trying /usr/local/lib/python2.0/structmodule.so
> # trying /usr/local/lib/python2.0/struct.py
> # trying /usr/local/lib/python2.0/struct.pyc
> # trying /usr/local/lib/python2.0/plat-linux2/struct.so
> # trying /usr/local/lib/python2.0/plat-linux2/structmodule.so
> # trying /usr/local/lib/python2.0/plat-linux2/struct.py
> # trying /usr/local/lib/python2.0/plat-linux2/struct.pyc
> # trying /usr/local/lib/python2.0/lib-tk/struct.so
> # trying /usr/local/lib/python2.0/lib-tk/structmodule.so
> # trying /usr/local/lib/python2.0/lib-tk/struct.py
> # trying /usr/local/lib/python2.0/lib-tk/struct.pyc
> # trying /usr/local/lib/python2.0/lib-dynload/struct.so
> # trying /usr/local/lib/python2.0/lib-dynload/structmodule.so
> 'import site' failed; traceback:
> Traceback (most recent call last):
> File "/usr/local/lib/python2.0/site.py", line 146, in ?
> sys.setdefaultencoding('ascii')
> LookupError: no codec search functions registered: can't find encoding
> [...]
>
> But the bizarre thing is that the last file it tries
> (/usr/local/lib/python2.0/lib-dynload/structmodule.so) actually
> exists!!!
>
> OK, so there's code masking the ImportError in import_encodings() in
> codecs.c. I disabled that (hmm, maybe this should be disabled
> automatically when -v is used!).
Hard to do since the setting of the verbosity flag is not
available to Python code.
> Now I get this traceback:
>
> Traceback (most recent call last):
> File "/usr/local/lib/python2.0/site.py", line 146, in ?
> sys.setdefaultencoding('ascii')
> File "/usr/local/lib/python2.0/encodings/__init__.py", line 30, in ?
> import codecs,aliases
> File "/usr/local/lib/python2.0/codecs.py", line 10, in ?
> import struct,types,__builtin__
> ImportError: /usr/local/lib/python2.0/lib-dynload/structmodule.so: undefined symbol: PyString_Type
>
> OK, I've managed to fix it by a change to the way I build Python: I'm
> now linking the struct module (and everything in Setup up to and
> including _codecs) statically.
>
> But I guess what's really missing is some kind of flag that tells the
> linker to export all symbols in the libpython2.0.a file... Is there a
> way? (I feel so stupid!)
From man ld:
-E
-export-dynamic
When creating an ELF file, add all symbols to the
dynamic symbol table. Normally, the dynamic symbol
table contains only symbols which are used by a dy
namic object. This option is needed for some uses
of dlopen.
(Not sure whether this is what you're looking for, though.)
--
Marc-Andre Lemburg
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Business: http://www.lemburg.com/
Python Pages: http://www.lemburg.com/python/
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