Re: Extending XML::LibXML through XS

On Sat, Nov 29, 2008 at 11:30 PM, Petr Pajas <[email protected]> wrote:
>
> Hi Emmanuel,
Hi Petr,

Thanks for the pointers!

>
> PmmSvNode(node) is a macro defined in XML::LibXML's libxml-perl-mm.h that
> expands to a function call PmmSvNodeExt(node,1) whose prototype is
>
> xmlNodePtr PmmSvNodeExt(SV* node, int copy);

I tried this but then I get the following error at runtime:
symbol lookup error: Xacobeo/XS/XS.so: undefined symbol: PmmSvNodeExt

I managed to get around this error by linking Xacobeo/XS/XS.so with
/usr/lib/perl5/auto/XML/LibXML/LibXML.so. I'm not too crazy about
linking to LibXML.so as I will need to detect where the .so is.

>
> Try adding just this prototype and either defining the macro or rewriting the
> typemap to use the direct function call. Hopefully the dynamical linker will
> be able to locate the symbol in XML/LibXML.so loaded with XML::LibXML. If
> not, you'll have to copy-paste the function from perl-libxml-mm.c.
>
I tried to copy  perl-libxml-mm.c and perl-libxml-sax.c (it's needed
by perl-libxml-mm.c) but I still have problem at runtime:
undefined symbol: PROXY_NODE_REGISTRY_MUTEX

I've checked and this mutex is declared in LibXML.c. I tried to link
again with LibXML/LibXML.so but the error persists. The only way I
found out to remove the error is to declare  PROXY_NODE_REGISTRY_MUTEX
in xs file. I'm not sure that this is a great idea as the mutex seems
to be used for thread synchronization and this will create two
different mutexes.

I think that I have no choice but to use the first alternative: to
declare the prototypes of PmmSvNode and PmmSvNodeExt and to link with
XML/LibXML/LibXML.so
-- 
Emmanuel Rodriguez
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