On Fri, 2008-08-08 at 14:24 -0500, Brian Peschel wrote:
> I am very stumped here.
>
> I wrote an custom driver for mapnik to read a proprietary data format.
> I defined rules and have everything running fine. If I build mapnik
> with debug:
> python scons/scons.py DEBUG=True
> python scons/scons.py DEBUG=True install
>
> If I build without debug (removing src/*os agg/src/*o before rebuilding)
> python scons/scons.py DEBUG=False
> python scons/scons.py DEBUG=False install
>
> I crash when I define my rules. Specifically, I crash the first time I
> try to add a filter:
>
> currentRule->set_filter(mapnik::create_filter(filterText.c_str()));
> If I change my styles so rules are created without filters, it process
> the the styles until the first filter, then a crash.
>
> It is crashing in include/mapnik/filter_factory.hpp on line 57:
> return filters.top();
> and gdb tells me it is crashing in a boost function (this is mapnik
> 0.5.1 on Fedora 8).
>
> So I commented out everything in the MAPNIK_DEBUG blocks thinking that
> would cause the crash and I could track down what in the block is
> preventing the crash. No luck. I run fine with DEBUG=True and crash
> with DEBUG=False.
>
> I know nothing about SCons, so I don't know what else DEBUG=True is
> doing. There must be something I am missing. Configure boost
> differently maybe?
>
> My application does real time rendering (versus tile generation) so
> every thing I can remove increase speed is important (not to mention the
> extra logging that is occurring).
>
> Any help or ideas would be greatly appreciated. I have been looking at
> this for a couple of days now and don't know what else to look at.
Look for references to DEBUG in the SConstruct file. Chances are that it
is the compile flags which make the difference. With Debug=True many
optimisations are disabled to make the code easier to follow in the
debugger.
If you're running on Linux then I'd suggest trying to run the code with
valgrind. This tends to be able to spot many subtle coding errors like
accessing memory after a free.
Jon
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