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Undefined reference to `pthread_create'

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Undefined reference to `pthread_create' C programming forum discussing all C derivatives, including C#, C++, Object-C, and even plain old vanilla C. These languages are low level languages, and used on projects such as device drivers, compilers, and even whole computer operating systems.

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  #1  
Old September 25th, 2006, 09:21 PM
dillidamunda dillidamunda is offline
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Undefined reference to `pthread_create'
i made a program the error while compilation comes like:

undefined reference to `pthread_create'

pls suggest.
Last edited by dillidamunda : September 25th, 2006 at 09:42 PM. Reason: mismatch
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  #2  
Old September 25th, 2006, 10:44 PM
L7Sqr L7Sqr is offline
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Depends on the system, but try:

#include <pthread.h>

And when compiling:

gcc ... -pthread ...
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Old September 28th, 2006, 02:21 PM
c4all c4all is offline
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Quote:
Originally Posted by L7Sqr
Depends on the system, but try:

#include <pthread.h>

And when compiling:

gcc ... -pthread ...


I believe it should be
Quote:
gcc ... -lpthread ..
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Old September 28th, 2006, 10:34 PM
L7Sqr L7Sqr is offline
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Code:
tux64-05:0:~/tmp > gcc t.c
/tmp/ccKRLyw2.o: In function `main':
t.c:(.text+0x45): undefined reference to `pthread_create'
collect2: ld returned 1 exit status
tux64-05:0:~/tmp > gcc -pthread t.c
tux64-05:0:~/tmp >


Either way.

from man gcc
Code:

       -pthread
           Adds support for multithreading with the pthreads library.  This
           option sets flags for both the preprocessor and linker.
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Old May 7th, 2008, 07:45 AM
bob81 bob81 is offline
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This might also be useful.
This is also platform dependent. you can use -pthread and -lpthread both. The only difference is that:
Compiler/Platform :PGI Linux Command is: pgcc -lpthread
Compiler/Platform :GNU Linux, AIX Command is: gcc -pthread

Cheers!
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L7Sqr disagrees: You saved the day. And just in time too!
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