Re: [xml] xmlMemUsed() always returns 0 even when mem debug is activated

[Felip Manyé i Ballester <apaxeros gmail com>]

Thank you for your answer.

You were right, actually ldd shows that the binary links with the 
system-wide dynamic library (/usr/lib/libxml2.so.2), not the recompiled 
one. This is really strange, since I followed the instructions on this 
page: http://xmlsoft.org/FAQ.html#Developer, and precised an absolute 
path for xml2-config. Indeed its output seems correct, for:

gcc -o xml `/home/felip/libxml2/bin/xml2-config --cflags` -g xml.c 
`/home/felip/libxml2/bin/xml2-config --libs`

is expanded as:

gcc -o xml -I/home/felip/libxml2/include/libxml2 -g xml.c 
-L/home/felip/libxml2/lib -lxml2 -lm

I was able to make my program work by temporarily changing the link in 
/usr/lib, but of course this is not a satisfactory solution. How would I 
have to proceed in order to force a correct linking ? (I'm sorry but I 
had never really dealt with dynamic libraries and compilations options 
before...)

Regards,

Felip.


En/na Daniel Veillard ha escrit:
> On Thu, Dec 18, 2008 at 03:29:55PM +0100, apaxeros gmail com wrote:
>   
> > Hello,
> >
> > I've been trying to evaluate the amount of memory allocated using
> > xmlMemUsed. A similar question was asked in 2004:
> > http://mail.gnome.org/archives/xml/2004-March/msg00232.html, and Daniel
> > replied that mem debug had to be activated. That's why I recompiled libxml2
> > (version 2.6.30, on Ubuntu 8.04) with the option --with-mem-debug.
> > Unfortunately, the following code:
> >
> >  doc = xmlParseFile(argv[2]);
> >   if (doc == NULL)
> >   {
> >       printf ("%s could not be parsed\n", argv[2]);
> >       exit (1);
> >   }
> >   printf("Used memory: %d\n", xmlMemUsed());
> >   xmlDocDump(stdout, doc);
> >
> > always returns "Used memory: 0", while xmlDocDump() generates a correct
> > output. Is there a special way of using this function ?
> >     
>
>   make 100% sure you link with the newly recompiled library,
> if needed run under gdb and put a breakpoint on xmlMallocLoc.
>
> Daniel
>
>