openmp on dev c++

Question

Is there anyway to use openmp with dev c++. I have seen links on how to use in Visual Studio, but i am more comfortable with Dev C++ interface. Adding /openmp in the linker command line doesnt work either. I couldnt find the library to download too. Am i missing something. I tried running this sample code:

#include <stdio.h> 
#include <stdlib.h>

int main(int argc, char *argv[])
{
    #pragma omp parallel
    { 
       printf("Hello, world.\n");
    }
   return 0;
 }

From where I read it was mentioned Output on a computer with 2 Cores and 2 threads will be hello world printed twice. I have a core i7 but it was printed only once.

Where do you create a second thread? And FYI those headers are deprecated in C++. — Lightness Races in Orbit
– Lightness Races in Orbit, Commented Nov 7, 2011 at 15:09
@Tomalak The second thread is created by OpenMP, and the headers are just fine if this is C (but yeah, the question suggests that it’s C++). — Konrad Rudolph
– Konrad Rudolph, Commented Nov 7, 2011 at 15:11
Dev-C++ is outdated. Its development has stopped half a decade ago. Please use a modern IDE. — Konrad Rudolph
– Konrad Rudolph, Commented Nov 7, 2011 at 15:14

Lays · Accepted Answer · 2013-11-23 20:03:25Z

11

Tools > Compiler Options > Check the option "Add the following commands when compiler is called" > in the text area put "-fopenmp"

Compile and execute again :)

answered Nov 23, 2013 at 20:03

Lays

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1 Comment

Babaji Over a year ago

This helps. I think this is the answer that should be selected as the right one since the other one doesn't tell you how to do this on Dev C++.

tune2fs · Accepted Answer · 2011-11-07 15:08:00Z

4

I do not know Dev C++, but to enable openmp you also need to add the flag -fopenmp to your compiler. Additional to linking to omp.

With g++ it look like this

g++ yourProgram.cpp -o yourProgram -lgomp -fopenmp

-fopenmp will tell the compiler to generate parallel code. I hope this will help.

answered Nov 7, 2011 at 15:08

tune2fs

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1 Comment

Lightness Races in Orbit Over a year ago

Dev-C++ is an IDE. It invokes g++ by default (albeit the MinGW port).

Rodolfo · Accepted Answer · 2017-02-02 14:27:04Z

2

You have to include -fopenmp in

Project-> Project Option->Parameters - Link and
Tools ->Compiler Options (General) (check "add the following commands when calling the compiler" and include -fopenmp in the textBox

I have also included #include <omp.h> dev-c++ version 5.6.1

edited Feb 2, 2017 at 14:27

answered Feb 2, 2017 at 14:11

Rodolfo

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Comments

Victor · Accepted Answer · 2015-05-19 23:09:57Z

0

there is only the parallel region , the processor is informed that there is what parallelize , but as is parallelize the code they have to say via builders, probably what you want to use : #pragma omp sections

answered May 19, 2015 at 23:09

Victor

1

Comments

Aseem Ahir · Accepted Answer · 2016-10-22 23:54:01Z

0

I guess you also have to include the header file #include < omp.h > separately

answered Oct 22, 2016 at 23:54

Aseem Ahir

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