undefined reference while linking - gcc

Question

i have added a module to ns2 and i am compiling it when i get undefined reference error.
g++ -o ns \
-lXext -lX11 -lnsl -ldl -lm -lm -lrt -lneoclassic -lxml
maser/mamas.o: In function `mamasReasoner::mamasReasoner()':
mamas.cc:(.text+0x95): undefined reference to `NeoEnvironment::initFromNs(std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >&, std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >&, int)'
maser/mamas.o: In function `mamasReasoner::build_ontology_tree(knBase&)':
mamas.cc:(.text+0x1c84): undefined reference to `NeoEnvironment::evaluateCommand(String const&)'
maser/mamas.o: In function `NeoEnvironment::readXmlFromMemory(char const*, char const*)':
mamas.cc:(.text._ZN14NeoEnvironment17readXmlFromMemoryEPKcS1_[NeoEnvironment::readXmlFromMemory(char const*, char const*)]+0x14): undefined reference to `Parser::readXmlFromMemory(char const*, char const*)'
collect2: ld returned 1 exit status
make: *** [ns] Error
the library which it is asking for is present at the /usr/local/lib/libneoclassic.so and the makefile can be seen here http://pastebin.com/NZWPxKht
which use the following code for linking.
LINK = g++
LDFLAGS = -lneoclassic -lrt -lxml2
LDOUT = -o $(BLANK)
LIB = \
-L/usr/local/lib -ltclcl -L/usr/local/lib -lotcl -L/usr/local/lib -ltk8.4 -L/usr/local/lib -ltcl8.4 \
-lXext -lX11 \
-lnsl -ldl \
-lm -lm
OBJ_CC = \
tools/random.o tools/rng.o tools/ranvar.o common/misc.o common/timer-handler.o \
common/scheduler.o common/object.o common/packet.o \
common/ip.o routing/route.o common/connector.o common/ttl.o \
trace/trace.o trace/trace-ip.o \
classifier/classifier.o classifier/classifier-addr.o \
classifier/classifier-hash.o \
classifier/classifier-virtual.o \
classifier/classifier-mcast.o \
classifier/classifier-bst.o \
classifier/classifier-mpath.o mcast/replicator.o \
classifier/classifier-mac.o \
classifier/classifier-qs.o \
classifier/classifier-port.o src_rtg/classifier-sr.o \
src_rtg/sragent.o src_rtg/hdr_src.o adc/ump.o \
qs/qsagent.o qs/hdr_qs.o \
apps/app.o apps/telnet.o tcp/tcplib-telnet.o \
tools/trafgen.o trace/traffictrace.o tools/pareto.o \
tools/expoo.o tools/cbr_traffic.o \
adc/tbf.o adc/resv.o adc/sa.o tcp/saack.o \
tools/measuremod.o adc/estimator.o adc/adc.o adc/ms-adc.o \
adc/timewindow-est.o adc/acto-adc.o \
adc/pointsample-est.o adc/salink.o adc/actp-adc.o \
adc/hb-adc.o adc/expavg-est.o\
adc/param-adc.o adc/null-estimator.o \
adc/adaptive-receiver.o apps/vatrcvr.o adc/consrcvr.o \
common/agent.o common/message.o apps/udp.o \
common/session-rtp.o apps/rtp.o tcp/rtcp.o \
common/ivs.o \
common/messpass.o common/tp.o common/tpm.o apps/worm.o \
tcp/tcp.o tcp/tcp-sink.o tcp/tcp-reno.o \
tcp/tcp-newreno.o \
tcp/tcp-vegas.o tcp/tcp-rbp.o tcp/tcp-full.o tcp/rq.o \
baytcp/tcp-full-bay.o baytcp/ftpc.o baytcp/ftps.o \
tcp/scoreboard.o tcp/scoreboard-rq.o tcp/tcp-sack1.o tcp/tcp-fack.o \
tcp/tcp-asym.o tcp/tcp-asym-sink.o tcp/tcp-fs.o \
tcp/tcp-asym-fs.o \
tcp/tcp-int.o tcp/chost.o tcp/tcp-session.o \
tcp/nilist.o \
sctp/sctp.o apps/sctp_app1.o\
sctp/sctp-timestamp.o sctp/sctp-hbAfterRto.o \
sctp/sctp-multipleFastRtx.o sctp/sctp-mfrHbAfterRto.o \
sctp/sctp-mfrTimestamp.o \
sctp/sctp-cmt.o \
sctp/sctpDebug.o \
tools/integrator.o tools/queue-monitor.o \
tools/flowmon.o tools/loss-monitor.o \
queue/queue.o queue/drop-tail.o \
adc/simple-intserv-sched.o queue/red.o \
queue/semantic-packetqueue.o queue/semantic-red.o \
tcp/ack-recons.o \
queue/sfq.o queue/fq.o queue/drr.o queue/srr.o queue/cbq.o \
queue/jobs.o queue/marker.o queue/demarker.o \
link/hackloss.o queue/errmodel.o queue/fec.o\
link/delay.o tcp/snoop.o \
gaf/gaf.o \
link/dynalink.o routing/rtProtoDV.o common/net-interface.o \
mcast/ctrMcast.o mcast/mcast_ctrl.o mcast/srm.o \
common/sessionhelper.o queue/delaymodel.o \
mcast/srm-ssm.o mcast/srm-topo.o \
routing/alloc-address.o routing/address.o \
$(LIB_DIR)int.Vec.o $(LIB_DIR)int.RVec.o \
$(LIB_DIR)dmalloc_support.o \
webcache/http.o webcache/tcp-simple.o webcache/pagepool.o \
webcache/inval-agent.o webcache/tcpapp.o webcache/http-aux.o \
webcache/mcache.o webcache/webtraf.o \
webcache/webserver.o \
webcache/logweb.o \
empweb/empweb.o \
empweb/empftp.o \
realaudio/realaudio.o \
mac/lanRouter.o classifier/filter.o \
common/pkt-counter.o \
common/Decapsulator.o common/Encapsulator.o \
common/encap.o \
mac/channel.o mac/mac.o mac/ll.o mac/mac-802_11.o \
mac/mac-802_3.o mac/mac-tdma.o mac/smac.o \
mobile/mip.o mobile/mip-reg.o mobile/gridkeeper.o \
mobile/propagation.o mobile/tworayground.o \
mobile/antenna.o mobile/omni-antenna.o \
mobile/shadowing.o mobile/shadowing-vis.o mobile/dumb-agent.o \
common/bi-connector.o common/node.o \
common/mobilenode.o \
mac/arp.o mobile/god.o mobile/dem.o \
mobile/topography.o mobile/modulation.o \
queue/priqueue.o queue/dsr-priqueue.o \
mac/phy.o mac/wired-phy.o mac/wireless-phy.o \
mac/mac-timers.o trace/cmu-trace.o mac/varp.o \
mac/mac-simple.o \
satellite/sat-hdlc.o \
dsdv/dsdv.o dsdv/rtable.o queue/rtqueue.o \
routing/rttable.o \
imep/imep.o imep/dest_queue.o imep/imep_api.o \
imep/imep_rt.o imep/rxmit_queue.o imep/imep_timers.o \
imep/imep_util.o imep/imep_io.o \
tora/tora.o tora/tora_api.o tora/tora_dest.o \
tora/tora_io.o tora/tora_logs.o tora/tora_neighbor.o \
dsr/dsragent.o dsr/hdr_sr.o dsr/mobicache.o dsr/path.o \
dsr/requesttable.o dsr/routecache.o dsr/add_sr.o \
dsr/dsr_proto.o dsr/flowstruct.o dsr/linkcache.o \
dsr/simplecache.o dsr/sr_forwarder.o \
aodv/aodv_logs.o aodv/aodv.o \
aodv/aodv_rtable.o aodv/aodv_rqueue.o \
common/ns-process.o \
satellite/satgeometry.o satellite/sathandoff.o \
satellite/satlink.o satellite/satnode.o \
satellite/satposition.o satellite/satroute.o \
satellite/sattrace.o \
rap/raplist.o rap/rap.o rap/media-app.o rap/utilities.o \
common/fsm.o tcp/tcp-abs.o \
diffusion/diffusion.o diffusion/diff_rate.o diffusion/diff_prob.o \
diffusion/diff_sink.o diffusion/flooding.o diffusion/omni_mcast.o \
diffusion/hash_table.o diffusion/routing_table.o diffusion/iflist.o \
tcp/tfrc.o tcp/tfrc-sink.o mobile/energy-model.o apps/ping.o tcp/tcp-rfc793edu.o \
queue/rio.o queue/semantic-rio.o tcp/tcp-sack-rh.o tcp/scoreboard-rh.o \
plm/loss-monitor-plm.o plm/cbr-traffic-PP.o \
linkstate/hdr-ls.o \
mpls/classifier-addr-mpls.o mpls/ldp.o mpls/mpls-module.o \
routing/rtmodule.o classifier/classifier-hier.o \
routing/addr-params.o \
nix/hdr_nv.o nix/classifier-nix.o \
nix/nixnode.o \
routealgo/rnode.o \
routealgo/bfs.o \
routealgo/rbitmap.o \
routealgo/rlookup.o \
routealgo/routealgo.o \
nix/nixvec.o \
nix/nixroute.o \
diffserv/dsred.o diffserv/dsredq.o \
diffserv/dsEdge.o diffserv/dsCore.o \
diffserv/dsPolicy.o diffserv/ew.o diffserv/dewp.o \
queue/red-pd.o queue/pi.o queue/vq.o queue/rem.o \
queue/gk.o \
pushback/rate-limit.o pushback/rate-limit-strategy.o \
pushback/ident-tree.o pushback/agg-spec.o \
pushback/logging-data-struct.o \
pushback/rate-estimator.o \
pushback/pushback-queue.o pushback/pushback.o \
common/parentnode.o trace/basetrace.o \
common/simulator.o asim/asim.o \
common/scheduler-map.o common/splay-scheduler.o \
linkstate/ls.o linkstate/rtProtoLS.o \
pgm/classifier-pgm.o pgm/pgm-agent.o pgm/pgm-sender.o \
pgm/pgm-receiver.o mcast/rcvbuf.o \
mcast/classifier-lms.o mcast/lms-agent.o mcast/lms-receiver.o \
mcast/lms-sender.o \
queue/delayer.o \
xcp/xcpq.o xcp/xcp.o xcp/xcp-end-sys.o \
wpan/p802_15_4csmaca.o wpan/p802_15_4fail.o \
wpan/p802_15_4hlist.o wpan/p802_15_4mac.o \
wpan/p802_15_4nam.o wpan/p802_15_4phy.o \
wpan/p802_15_4sscs.o wpan/p802_15_4timer.o \
wpan/p802_15_4trace.o wpan/p802_15_4transac.o \
maser/maser.o maser/mamas.o \
$(OBJ_STL)
$(LINK) $(LDFLAGS) $(LDOUT)$# \
common/tclAppInit.o $(OBJ) $(LIB)

Answer 1

I figured out that the functions were declared but not implemented. As soon as I implemented them, the problem was solved.