C: Undefined symbols for architecture x86_64

Question

I call the function phtread_kill(gpsNavigationThread, 0) and ge the following error

Undefined symbols for architecture x86_64:

"_phtread_kill", referenced from:
  _startgpswatchdog in ccXXNhjy.o
ld: symbol(s) not found for architecture x86_64

I #include <pthread.h> so am not sure what the issue is.

I link as follows

gcc gps_nav.c dijk.c serial.c parser.c nav_corelogic.c -I/usr/include/libxml2 -lxml2 -lm -lpthread -o logic

I also #include signal.h but am not sure if there is a library for linking with it.

What OS? I think people are assuming Linux, but modern Linux-based systems do not use underscore prefix for C symbol names. Perhaps you're mixing binary code intended for another OS? — R.. GitHub STOP HELPING ICE, Apr 23 '11 at 17:09
@Helium3 sorry I had not seen it; and what about specifying one of -m32 or -m64, just to see if it is just a problem you are compiling in one way but the lib is available only as 32 or 64 bit... (afaik you cannot mix the thing in the same executable) — ShinTakezou, Apr 23 '11 at 17:28
there's a typo!! (brain is able to autosort letters in wrong position in known words, so it can be missed, this is a proof of that!) — ShinTakezou, Apr 23 '11 at 17:30

score 9 · Accepted Answer · answered Apr 23 '11 at 17:15

9

It's

pthread_kill(gpsNavigationThread, 0)

not:

phtread_kill(gpsNavigationThread, 0)

answered Apr 23 '11 at 17:15

karlphillip

hehe. thanks for spotting this. – some_id Apr 23 '11 at 18:17
I did the same error with strcopy (it is strcpy) – Simon Perepelitsa Aug 25 '12 at 08:40

score 0 · Answer 2 · answered Apr 23 '11 at 16:53

0

Have you linked with the pthreads library: -lpthread

answered Apr 23 '11 at 16:53

Tom Wadley

score 0 · Answer 3 · answered Apr 23 '11 at 16:54

0

Did you compile with -lpthread ?

answered Apr 23 '11 at 16:54

Henno Brandsma

score 0 · Answer 4 · answered Apr 23 '11 at 17:12

0

Try the -pthread option, which should set the appropriate options for both compilation and linking.

answered Apr 23 '11 at 17:12

Douglas Leeder

4 Answers4