[OSM-dev] [OSM-talk] Osm2Pgsql problem linking to libxml2

[Jon Burgess]

On Fri, 2007-02-09 at 15:49 +0000, yuri bay wrote:
> Hi,
> 
> I am still trying to solve the osm2pgsql compiling problem.  I wanted to use 
> OSM on winGRASS and need to import OSM data into PostgreSQL.  Since 
> osm2pgsql requires libxml2, I have managed to installed the libxml2, and 
> have downloaded the libxml binary files as wll.  But regardless of that I am 
> still having problem to compile osm2pgsql??  The following is the errors and 
> I would be grateful if someone could help.  Many thanks
> 
> 
> gcc osm2pgsql.c -o osm2pgsql -L c:/libxml/ -lxml
> 
> C:/Docume~1/Casey/Local~1/Temp/ccsDaaaa.o(.text+0xae6):osm2pgsql.c: 
> undefined reference to 'xmlStrEqual'
> ....undefined reference to 'xmlStrEqual'
> ....undefined reference to 'xmlTestReaderGetAttribute'
> ....undefined reference to 'bst_insert'
> ....undefined reference to '_imp_xmlFree'
> ....undefined reference to 'avl_insert'
> ....undefined reference to 'bst_balance'
> ...
> ...
> make: *** [osm2pgsql] Error 1
> 
> I have tried -lxml or -lxml2 the results were the same.  What is -lxml 
> means?
> 


'-lxml' means "dynamically link with the library called libxml".
Any -lFOO causes linking with libFOO.

I'm afraid you need to link together multiple object files to create
this binary, something like...

gcc -c -o osm2pgsql.o osm2pgsql.c
gcc -c -o bst.o bst.c
gcc -c -o avl.o avl.c
gcc -L c:/libxml/ -lxml2 -lz -lm  osm2pgsql.o bst.o avl.o   -o osm2pgsql

Normally the 'make' tool would handle most of this complexity for you
(using the instructions it reads from the Makefile). I'm not too
familiar with the Win32 cygwin/mingw build environment but make should
be readily available to take care of this for you. 

One slightly off topic suggestion is that you would probably find that a
lot of the OSM tools compile and operate more easily on a Linux distro.
You should be able to get hold of and install for a quite reasonable
cost (often $0). 

	Jon