How compile with in Minix?

Question

Currently, I am studying Minix and I am doing a system based on threads and do not know how to compile my program.

For example: Mthreads.c

#include <stdlib.h>
#include <stdio.h>
#include <minix/mthread.h>

void hola(int y){
     printf("Hola Mundo");
}

int main(){

    mthread_thread_t a;

    mthread_create(&a, NULL, (void*)hola, 0);
    mthread_join(a, NULL);
}

Then I run clang to compile:

# clang Mthreads.c 
/var/tmp/g-10649b.o: In function `main':
Mthreads.c:(.text+0x5f): undefined reference to `mthread_create'
Mthreads.c:(.text+0x7d): undefined reference to `mthread_join'
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Any idea how to make this work?

I never used minix however I can give you a hint: the error that you're getting is a linker error. The compiler was able to find the symbols "mthread_create" and "mthread_join" inside the header file: "minix/mthread.h" however it cannot find the implementation of these functions. Usually these will be in a c library (either static or dynamic). So you need to figure out where the minix libraries are and tell the linker to look for them with "-l" option in command line. — Uri Brecher, Apr 28 '16 at 04:07
Possible duplicate of [Undefined reference to 'pthread\_create' — linker command option order (libraries before/after object files?)](http://stackoverflow.com/questions/9253200/undefined-reference-to-pthread-create-linker-command-option-order-libraries) — NathanOliver, Dec 22 '16 at 16:48

score 1 · Accepted Answer · edited Jan 04 '19 at 07:55

1

Use mthread library when compiling. Try it and you will solve your problem

clang Mthreads.c -lmthread

edited Jan 04 '19 at 07:55

Polluks

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answered Apr 28 '16 at 04:14

msc

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Do you mean `-pthread` as in the text or `-lpthread` as in the command line? Also, why `pthread` (which normally means POSIX threads) rather than `-lmthread` (which looks more natural to an outsider's eyes) or perhaps `-lthread`. – Jonathan Leffler Apr 28 '16 at 04:36
1

@JonathanLeffler: you guessed correctly, it should really be `-lmthread` in MINIX. – AntoineL Jun 12 '16 at 19:15

How compile with in Minix?

1 Answers1