Re: [Pyobjc-dev] Segfault on py2app with lxml

[Ronald O. <ron...@ma...>]

On 9 Apr, 2008, at 2:59, Paul Everitt wrote:
>
> Hi all.  I have a weird issue and I'm looking for ideas on how to  
> debug it.
>
> I'm using the system Python on Leopard and I'm trying to bundle lxml
> compiled against an update libxml2/libxslt install.  I want to use
> py2app to freeze everything into a .app.
>
> For a basic, no-GUI app bundle, everything works fine.
>
> However, when my application uses a WebKit widget, I get a segfault  
> when
> doing various lxml operations.  A few lines added to the
> PyDocURLProtocol example application demonstrate the problem.
>
> lxml has some constants you can get to and inspect the version of  
> libxml
> that lxml is compiled against.  When I run my .app, I see the newer
> versions and not the system versions of libxml2/libxslt.  Also, I see
> the dylib copied into the bundled.
>
> My suspicion is that, because WebKit has a libxml2 and libxslt, that
> somehow the two are conflicting.  But, it's hard to investigate.
>
> Any suggestions?

I have a couple of things you could look into:

- does the application work when you use an alias bundle (py2app -A)?

- is your own build of lxml/libxml/... build using two-level  
namespaces or a single-level namespace? The former is default, to get  
the second you have to add '-flat_namespace' or '- 
force_flat_namespace' to the command-line while linking. The latter  
option is especially suspect, as it can cause problems like the one  
you're having.

Ronald
>
>
> --Paul
>
>
>
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