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Posted to dev@httpd.apache.org by Abhinav Upadhyay <ab...@hover.in> on 2010/06/20 18:56:23 UTC

undefined symbol errors on loading a module that uses libxml2

Hello everyone! 

I am writing an Apache 2.2 module that uses the libxml2 API. I have compiled the
module using following commands:

apxs -I /usr/include/libxml2/ -c mod_xmltest.c
sudo apxs -n xmltest_module -i mod_xmltest.la

and used the following LoadFile directive in httpd.conf

LoadFile /usr/lib/libxml2.so

However on starting the server I am getting following error:

httpd: Syntax error on line 432 of /usr/local/apache2/conf/httpd.conf: Cannot
load /usr/local/apache2/modules/mod_hoverin.so into server:
/usr/local/apache2/modules/mod_hoverin.so: undefined symbol: xmlFreeNode

what could be wrong here ?

Thanks and Regards
Abhinav

Re: undefined symbol errors on loading a module that uses libxml2

Posted by Abhinav Upadhyay <ab...@hover.in>.



alin vasile <alinachegalati <at> yahoo.com> writes:

> 
> 
> 
> execute a ldd for /usr/lib/libxml2.so and see if all the dependecies are
satisfied.
>  
> Post the entire LoadModule/LoadFile area, I'm not sure if the order matters.
> 
> 
> 
> From: Abhinav Upadhyay <abhinav <at> hover.in>To: dev <at>
httpd.apache.orgSent: Sun, June 20, 2010 7:56:23 PMSubject: undefined symbol
errors on loading a module that uses libxml2Hello everyone! I am writing an
Apache 2.2 module that uses the libxml2 API. I have compiled themodule using
following commands:apxs -I /usr/include/libxml2/ -c mod_xmltest.csudo apxs -n
xmltest_module -i mod_xmltest.laand used the following LoadFile directive in
httpd.confLoadFile /usr/lib/libxml2.soHowever on s
>  tarting the server I am getting following error:httpd: Syntax error on line
432 of /usr/local/apache2/conf/httpd.conf: Cannotload
>  /usr/local/apache2/modules/mod_hoverin.so into
server:/usr/local/apache2/modules/mod_hoverin.so: undefined symbol:
xmlFreeNodewhat could be wrong here ?Thanks and RegardsAbhinav
> 
> 
> 
> 
> 
Hi, thanks for replying.
I tried changing the order of the directives.
I put the LoadFile directive before the LoadModule directive and it worked.
Thanks and Regards
Abhinav

Re: undefined symbol errors on loading a module that uses libxml2

Posted by alin vasile <al...@yahoo.com>.

execute a ldd for /usr/lib/libxml2.so and see if all the dependecies are satisfied.

Post the entire LoadModule/LoadFile area, I'm not sure if the order matters.

________________________________
From: Abhinav Upadhyay <ab...@hover.in>
To: dev@httpd.apache.org
Sent: Sun, June 20, 2010 7:56:23 PM
Subject: undefined symbol errors on loading a module that uses libxml2

Hello everyone! 

I am writing an Apache 2.2 module that uses the libxml2 API. I have compiled the
module using following commands:

apxs -I /usr/include/libxml2/ -c mod_xmltest.c
sudo apxs -n xmltest_module -i mod_xmltest.la

and used the following LoadFile directive in httpd.conf

LoadFile /usr/lib/libxml2.so

However on starting the server I am getting following error:

httpd: Syntax error on line 432 of /usr/local/apache2/conf/httpd.conf: Cannot
load /usr/local/apache2/modules/mod_hoverin.so into server:
/usr/local/apache2/modules/mod_hoverin.so: undefined symbol: xmlFreeNode

what could be wrong here ?

Thanks and Regards
Abhinav