Resolving sem_* link errors on Linux
 

Hi,

I am having difficulty resolving this link errors with one of the file. Is there a particular library that I missed or need to include when using semaphore.h?

Platform: Linux

>>semtest.o: In function `main':
>>semtest.o(.text+0x18): undefined reference to `sem_unlink'
>>semtest.o(.text+0x69): undefined reference to `sem_open'
>>semtest.o(.text+0x104): undefined reference to `sem_wait'
>>semtest.o(.text+0x184): undefined reference to `sem_getvalue'
>>semtest.o(.text+0x233): undefined reference to `sem_post'
>>collect2: ld returned 1 exit status
>>make: *** [semtest] Error 1

Any help would be appreciated. I am stuck at this point.

Thanks,

kl

Maybe try to link it with libpthread (-lpthread)

grep sem_unlink /lib/libpthread-0.10.so
-->Binary file /lib/libpthread-0.10.so matches

I link with -lrt and it went away for now.