#!/bin/sh
# autopkgtest check: Build and run a simple program against libgfortran,
# to verify basic compile-time and run-time linking functionality.

set -e

CC=gcc-9
F95=gfortran-9

WORKDIR=$(mktemp -d)
trap "rm -rf $WORKDIR" 0 INT QUIT ABRT PIPE TERM
cd $WORKDIR
cat <<EOF > hello-gomp.c
#include <omp.h>
#include <stdio.h>
#include <stdlib.h>
int main (int argc, char *argv[]) {

int nthreads, tid;

/* Fork a team of threads giving them their own copies of variables */
#pragma omp parallel private(nthreads, tid)
 {

 /* Obtain thread number */
 tid = omp_get_thread_num();
 printf("Hello World from thread = %d\n", tid);

 /* Only master thread does this */
 if (tid == 0)
 {
  nthreads = omp_get_num_threads();
 printf("Number of threads = %d\n", nthreads);
 }

 } /* All threads join master thread and disband */
}
EOF

$CC -fopenmp -o gctest hello-gomp.c
echo "build: OK"
ldd gctest
[ -x gctest ]
./gctest
echo "run: OK"

cat <<EOF > hello-gomp.f
       program omp_par_do
         implicit none

         integer, parameter :: n = 100
         real, dimension(n) :: dat, result
         integer :: i

         !$OMP PARALLEL DO
         do i = 1, n
            result(i) = my_function(dat(i))
         end do
         !$OMP END PARALLEL DO

       contains

         function my_function(d) result(y)
           real, intent(in) :: d
           real :: y

           ! do something complex with data to calculate y
         end function my_function
       end program omp_par_do
EOF

$F95 -fopenmp -o gftest hello-gomp.f
echo "build: OK"
ldd gftest
[ -x gftest ]
./gftest
echo "run: OK"