VLC module, Cwiid, Linux, Wiimote, compilation issue - compilation

Question

I'm trying to write a vlc module to control it with the wiimote.
http://wiki.videolan.org/Hacker_Guide/How_To_Write_a_Module
I'm using the library cwiid.h http://abstrakraft.org/cwiid/wiki/libcwiid
I'm on Kubuntu 11.10 and when I'm compiling my module with ./vlc -vvv --extraintf wiimote I've this message :
main interface warning: cannot load module `/home/staross/vlc/modules/control/.libs/libwiimote_plugin.so' (/home/staross/vlc/modules/control/.libs/libwiimote_plugin.so: undefined symbol: cwiid_find_wiimote)
The compilator can't find the library, there is a link problem.
the library is installed in this directory: /usr/local/include/cwiid.h
I've already try lot of things:
put the absolute path in the #include<>
Change the path of cwiid.h : /home/staross/vlc/include/
Modify the file ld.so.conf and add this lines:
include /etc/ld.so.conf.d/*.conf
include /usr/local/lib/*.h
Modify the configure.ac file and add theses lines
dnl
dnl Wiimote plugin
dnl
AC_ARG_ENABLE(wiimote,
[ --enable-wiimote wiimote support (default disabled)])
if test "${enable_wiimote}" = "yes"
then
AC_CHECK_HEADER(cwiid.h, AC_CHECK_LIB(cwiid, cwiid_open, have_cwiid="true", have_cwiid="false"), have_cwiid="false")
if test "${have_cwiid}" = "true"
then
VLC_ADD_PLUGIN([wiimote])
VLC_ADD_LIBS([wiimote],[-lcwiid])
fi
fi
Modify the Modules.am like that
SOURCES_hello = hello.c
SOURCES_wiimote = wiimote.c
SUBDIRS = globalhotkeys dbus
SOURCES_dummy = dummy.c
SOURCES_gestures = gestures.c
SOURCES_netsync = netsync.c
SOURCES_ntservice = ntservice.c
SOURCES_hotkeys = hotkeys.c
SOURCES_lirc = lirc.c
SOURCES_oldrc = rc.c
if HAVE_DARWIN
motion_extra = unimotion.c unimotion.h
else
motion_extra = $(NULL)
endif
SOURCES_motion = \
motion.c \
$(motion_extra) \
$(NULL)
libvlc_LTLIBRARIES += \
libdummy_plugin.la \
libgestures_plugin.la \
libnetsync_plugin.la \
libhotkeys_plugin.la \
libhello_plugin.la \
libwiimote_plugin.la
if !HAVE_WINCE
libvlc_LTLIBRARIES += \
liboldrc_plugin.la
if !HAVE_WIN32
libvlc_LTLIBRARIES += \
libmotion_plugin.la
else
libvlc_LTLIBRARIES += \
libntservice_plugin.la
endif
endif
And of course the code from wiimote.c
#include <fcntl.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
/* VLC core API headers */
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_interface.h>
#include <stdlib.h>
#include <vlc_input.h>
#include <vlc_vout.h>
#include <vlc_aout.h>
#include <vlc_osd.h>
#include <vlc_playlist.h>
#include <cwiid.h>
#define BATTERY_STR_LEN 14
#define CHANNELS_NUMBER 4
#define VOLUME_TEXT_CHAN p_global_intf->p_sys->p_channels[ 0 ]
#define VOLUME_WIDGET_CHAN p_global_intf->p_sys->p_channels[ 1 ]
/* Forward declarations */
static int Open ( vlc_object_t * );
static void Close ( vlc_object_t * );
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_shortname( N_("Wiimote") )
set_description( N_("Wiimote control interface") )
set_category( CAT_INTERFACE )
set_subcategory( SUBCAT_INTERFACE_CONTROL )
set_capability( "interface", 0 )
set_callbacks( Open, Close )
vlc_module_end ()
/*****************************************************************************
* intf_sys_t: description and status of interface
*****************************************************************************/
struct intf_sys_t
{
cwiid_wiimote_t* p_wiimote; /* wiimote handle */
struct cwiid_state state; /* wiimote state */
bdaddr_t bdaddr; /* bluetooth device address */
int p_channels[ CHANNELS_NUMBER ]; /* contains registered
* channel IDs */
uint16_t status;
};
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static void Run( intf_thread_t * );
void cwiid_callback(cwiid_wiimote_t *wiimote, int mesg_count, union cwiid_mesg mesg[], struct timespec *timestamp);
void cwiid_btn(struct cwiid_btn_mesg *mesg);
static void DisplayVolume( intf_thread_t *p_intf, vout_thread_t *p_vout,
audio_volume_t i_vol );
static void ClearChannels( intf_thread_t *p_intf, vout_thread_t *p_vout );
/*****************************************************************************
* Open: initialize interface
*****************************************************************************/
static int Open( vlc_object_t *obj )
{
intf_thread_t *p_intf = (intf_thread_t *)obj; /* déclaration d'un Thread */
intf_sys_t *p_sys; /* déclaration d'un pointeur p_sys de type intf_sys_t */
p_intf->p_sys = p_sys = malloc( sizeof( intf_sys_t ) );
if( p_sys == NULL )
{
msg_Info(p_intf, "VLC_ENOMEM\n");
return VLC_ENOMEM;
}
/* #define BDADDR_ANY (&(bdaddr_t) {{0, 0, 0, 0, 0, 0}}) */
p_sys->bdaddr = *BDADDR_ANY;
p_intf->pf_run = Run;
msg_Info(p_intf, "VLC_SUCCESS\n");
return VLC_SUCCESS;
}
/*****************************************************************************
* Close: destroy interface
*****************************************************************************/
static void Close( vlc_object_t *obj )
{
intf_thread_t *p_intf = (intf_thread_t *)obj;
intf_sys_t *p_sys = p_intf->p_sys;
free( p_sys );
}
intf_thread_t *p_global_intf = NULL;
/*****************************************************************************
* Run: main loop
*****************************************************************************/
static void Run( intf_thread_t *p_intf )
{
p_global_intf = p_intf;
intf_sys_t *p_sys = p_intf->p_sys; /* déclaration d'un pointeur p_sys de type intf_sys_t */
struct cwiid_state state;
p_sys->status = 0;
msg_Err(p_intf, "Put Wiimote in discoverable mode (press 1+2) to connect it...\n");
cwiid_find_wiimote(&p_sys->bdaddr, 0);
msg_Info(p_intf, "Test\n");
}
So the question here is what can I do now to hope that the compilator will find the library and recognise the cwiid.h functions ?
Thank you!

Answer 1

I solved the problem:
objdump -T libwiimote_plugin.so
I modified the Makefile from vlc/modules/control/Makefile and add: LIBS_wiimote = -lcwiid
after
rm *wiimote*
rebuild with
make V=1 libwiimote_plugin.la
problem solved :)