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Old 06-23-2013, 03:02 PM   #1
LQ Newbie
Registered: Jun 2013
Distribution: linuxmint
Posts: 1

Rep: Reputation: Disabled
Wink problem with -fopenmp

hi everyone,I've very basic knowledge about programming.

As a part of program, i had to implement parallel processing in one program file, and that needs to be compiled using a make file. when i was compiling with -fopenmp it is showing the following error

undefined reference to GOMP_parallel_start
undefined reference to GOMP_parallel_end
undefined reference to omp_get_num_threads
undefined reference to omp_get_thread_num
undefined reference to GOMP_barrier

in make file target was written as

problemdef.o: problemdef.cpp
$(CXX) -fopenmp $(CXXFLAGS) $<

and the program was as follows

#include <vector>
#include <complex.h>
#include <iostream>
#include <time.h>
#include <math.h>
#include <cstdlib>
#include <stdio.h>
#include <string.h>
#include <omp.h>
#include <fstream>

#ifndef GLOBAL_H
#include "global.h"
#include "m_minrad.h"
#include "functs.h"

#define PAR // Comment out if not parallel version
using namespace std;

void test_problem(double* parameters)
int i;
#ifdef PAR
#pragma omp parallel for private(parameters,i)



could anyone please find what's wrong with program or part of makefile,it would be of great help to me
Old 07-02-2013, 09:53 AM   #2
Registered: Nov 2003
Location: Edinburgh, UK
Distribution: Arch
Posts: 43

Rep: Reputation: 18
It looks like the library containing the OpenMP functions is not being found by the compiler. Typically the library is named<whatever>. You could check where the loader is looking for libraries by, say, ld --verbose | grep SEARCH_DIR


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