I have another example of segmentation faults when returning values from exslt functions. Again, I can't give you a minimal test stylesheet (durn it), but this one has a slightly different configuration and the solution may be of interest.
The function itself is a pretty straightforward substitute for the non-existent fn:lower-case() xpath function:
<xsl:param name="str" />
<func:result select="translate($str,$upper_alphabet,$lower_alphabet)" />
In this case I was not able to modify the function itself so as to get rid of the segmentation fault. Nothing worked.
The original place where the segfault was happening was the line:
<xsl:variable name="lower" select="wpn:lowercase(string(.))" />
The following modification removed the segfault:
<xsl:value-of select="wpn:lowercase(string(.))" />
I have done some cursory code inspection. All that bought me was the knowledge that cursory code inspection was insufficient. Duh.
I can duplicate this with xsltproc and our entire body of templates. I would take a whack at debugging through at this point if I knew how to get started with the debugger with libxml/libxslt. For example, are there debugging parameters to make? Is there a web page giving hints on this?
Marc M. Adkins