Re: RE : RE : [matplotlib-devel] crash on matplotlib.matlab import on win32

[John H. <jdh...@ac...>]

>>>>> "Gregory" == Gregory Lielens <gre...@ff...> writes:

    Gregory> Hello,

    Gregory> I wondered if it is possible for me to compile a version
    Gregory> of matplotlib (using numarray) from source on
    Gregory> windows...so that I can play with the source and try to
    Gregory> locate the origin of the strange crash I have. I have
    Gregory> visual C++ 6.0 compiler, not sure if this is ok as my
    Gregory> first tests usind setup.py build did not succeed (linking
    Gregory> failed)...so is this relatively easy to do...or really
    Gregory> better leaved to true masochists? ;-)

It's not too hard, and I would be very thankful if you did!  I suggest
following the instructions in setupext.py.  That points you to the
win32_static dir with enclosed README instructions on how to set up
mingw32.  I've never built matplotlib with VC so I can't really advise
you there.

One thing that may simplify the build for you is you can turn off
BUILD_AGG, BUILD_IMAGE, BUILD_TKAGG, and BUILD_GTKAGG since you
experienced the problem with backend ps.  So you should be able to
safely skip the stuff about getting GTK and Tk.  

If you get it with

>>> import matplotlib
>>> matplotlib.use('PS')
>>> from matplotlib.matlab import *

The problem must be in _transforms or ft2font.  Unless of course this
is a really funky bug, which it appears to be.

To narrow the focus further, you might do

# new python shell
>>> import matplotlib
>>> matplotlib.use('PS')
>>> import matplotlib._transforms

# start a new python shell
>>> import matplotlib
>>> matplotlib.use('PS')
>>> import matplotlib.ft2font

Do either of these crash ?

I'm putting my money on _transforms, since it uses numarray and
ft2font doesn't.  Since you only get the crash with numarray builds,
the only logical place for the bug to be is in the _transforms module.
But will logic help us here ?!?

Another hackish debugging technique is to insert a lot of print
statements in matplotlib.matlab to find out where the crash is
occurring, ie, on which import line.

Good luck setting up the build environment.


JDH