Sun Studio Express 11.08 Known Problems and Workarounds

Version 14 by richard.friedman.at.sun
on Nov 15, 2008 01:07.
<< Changes from 13 to 14
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Current by richard.friedman.at.sun
on Dec 15, 2008 09:14.
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h2. OpenMP
The following issues have been reported with the OpenMP implementation in the compilers.
 

* C++ only: Compilation of a C++ program with {{-xopenmp}} may fail if the program contains a {{goto}} that jumps around a parallel region (CR 6708263).\\
Here is an example program that will fail compilation:
{code}
#include <omp.h>
#include <stdio.h>

int main ()
{
int i;
int x = 0;

if (omp_get_nested() != 0) {
goto END;
}

#pragma omp parallel
{
#pragma omp critical
x += 1;
}

END:
printf("x: %i\n", x);
return 0;
}
{code}


* C, C++, and Fortran: Static with chunksize loop schedule does not work with unsigned loop index (CR 6728643).
\\
Here is an example program. The program will loop forever at runtime.
{code}
#include <stdio.h>
#include <omp.h>

int main(void)
{
unsigned int k;

omp_set_dynamic(0);
omp_set_num_threads(2);

#pragma omp parallel for schedule(static, 2)
for (k = 1; k <= 30; k++)
{
printf ("k = %d, id = %d\n", k, omp_get_thread_num());
}

return 0;
}
{code}


* Fortran only: Loop nest in a subroutine with collapse clause and with variable loop step (step passed as argument to subroutine) gives incorrect result (CR 6714724).
\\
Here is an example program. The program will print a wrong value for {{i}}
{code}
subroutine sub (l1, u1, s1, l2, u2, s2)
implicit none
integer :: l1, u1, s1, l2, u2, s2
integer :: i, j, m

!$omp parallel do collapse (2) lastprivate (i, j, m)
do i = l1, u1, s1
do j = l2, u2, s2
m = i * 100 + j * 10
end do
end do

print *, "i =", i, " j =", j, " m =", m
end subroutine sub


program test
integer, parameter :: LB1 = 2, UB1 = 6, ST1 = 1
integer, parameter :: LB2 = -2, UB2 = 3, ST2 = 1

call sub (LB1, UB1, ST1, LB2, UB2, ST2)
end program
{code}

* C, C++, and Fortran: {{omp_init_nest_lock()}} fails when program is compiled with {{-xopenmp=noopt}} and {{-m64}} (CR 6723134).
\\
Here is an example program. The program will dump core at runtime.
{code}
#include <omp.h>
#include <stdio.h>

int main ()
{
omp_nest_lock_t lck;
int t;
int errors = 0;

omp_init_nest_lock (&lck);
return 0;
}
{code}

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