Summary

Linux Linking Errors

Synopsis

When linking the application, the following error is seen:

../LINUX/int_lib/liblmgr.a(l_unixmt.o)(.text+0x1cc): In function `l_mt_heartbeat'::
 undefined reference to `pthread_create'../LINUX/int_lib/liblmgr.a(l_unixmt.o)
(.text+0x427): In function `l_mt_free':: undefined reference to `pthread_join'collect2: 
ld returned 1 exit status.

Discussion

This is caused by missing the "-lpthread" link flag.Adding the "-lpthread" should resolve the problem.

Below is an example using our lmflex sample application:

Makefile :Line1: lmflex: $(SRCDIR)/lmflex.c $(SRCDIR)/lm_code.h $(CLIENTLIB) 
lmstriplm_new.oLine2: $(MAKE) lm_new.oLine3: $(CC) $(CFLAGS) $(SRCDIR)/lmflex.cLine4: $(CC) -
olmflex lmflex.o lm_new.o $(CLIENTLIB) $(XTRALIB) $(THREADLIB)Line5: rm lmflex.oLine6: $(STRIP 
lmflexLine7: ./lmstrip lmflexLine8: rm -f lm_new.o. After you type "make lmflex" from the shell,
you will see the following lines. 
As you can see Line#3 and Line#4 below refers to the makefile
 file Line#3 and Line#4 above.Line3: cc -c -g -I../machind -I. -DRELEASE_VERSION -DSUNOS5 -
DLM_INTERNAL ../machind/lmflex.cLine4: cc -o lmflex lmflex.o lm_new.o liblmgr.a libcrvs.a 
libsb.a -lsocket -lnsl -lintl -lsocket -lnsl -lintl -lpthread -lpthread.