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The Problem:
- you embed Python in some app
- the app dynamically loads libexpat of version X
- the embedded Python imports pyexpat (which was built
against
 libexpat version X+n)
--> pyexpat gets the expat symbols from the already
loaded and *older*
 libexpat: crash (Specifically the crash we observed
was in
 getting an old XML_ErrorString (from xmlparse.c)
and then calling
 it with newer values in the XML_Error enum:
 // pyexpat.c, line 1970
 ...
 // Added in Expat 1.95.7.
 MYCONST(XML_ERROR_UNBOUND_PREFIX);
 ...
The Solution:
Prefix all a exported symbols with "PyExpat_". This is
similar to
what Mozilla does for some common libs:
http://lxr.mozilla.org/seamonkey/source/modules/libimg/png/mozpngconf.h#115
I'll attach the gdb backtrace that we were getting and
a patch.