Jaap Spies wrote: > I'm trying to make a vpython package for SAGE: > see http://www.vpython.org/index.html [...] Got an answer from the VPython mailing list:
> Jaap Spies wrote: >> Bruce Sherwood wrote: >>> Dunno whether this might explain the problem that was seen with the Sage > [] >>> It seems that the option,"unicode=ucs4" ,is not used in compiling >>> "Python-2.5.1". > [] >> Is this option essential for vpython??? > > This whole problem has nothing to do with vpython, or only insofar as it uses > libboost_python for building. It is a libboost_python problem. > Libboost_python uses (by default) unicode, and therefore it needs to be > linked together with the same flavor of python, UCS2 or UCS4, that it was > built with. > > From the original post it seems clear that there were two pythons present on > the machine, the one from SAGE which believes in UCS2, and the one from the > linux distribution which believes in UCS4. The libboost_python was built > against the UCS4 python, so it cannot be used with UCS2 python. In other > words, if you want to build vpython with the python from SAGE, you first have > to build libboost_python with the same python. > > After reading up on this story, I still find it incredible that the python > developers consciously decided to allow python to adhere to one of two > incompatible persuasions, UCS2 and UCS4, so that compiled modules > (extensions) must adhere to the same persuasion as the python they were built > with, or they will crash. What is worse is that you don't see from the > outside which persuasion your python was built with, unless you run something > like > > python -c 'import sys; print sys.maxunicode' > > or you search for UCS2 or UCS4 in symbol names in the binary executable. > > AFAICT, UCS2 is still the default, i.e. you get this if you don't use any > --unicode configure flag. > > -- > Martin > > > > See also > http://mail.python.org/pipermail/distutils-sig/2006-July/006579.html for a discussion of Python and UCS2 vs. UCS4 Ubuntu and Fedora distribute Python compiled with UCS4. Maybe the Python version of SAGE should comply with the distribution, so for example libboost_python can be used. Jaap --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-devel@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
