Pointers are not allowed in an OpenMP* FIRSTPRIVATE clause

The rules for the FIRSTPRIVATE clause for C/C++ are:

• A variable of class type (or array thereof) that appears in a FIRSTPRIVATE clause requires an accessible, unambiguous copy constructor for the class type.
• A variable that appears in a FIRSTPRIVATE clause must not have a CONST qualified type unless it is of class type with a mutable member.
• A variable that appears in a FIRSTPRIVATE clause must not have an incomplete C/C++ type or a reference type.

For FORTRAN, the rules are:

• A variable that appears in a FIRSTPRIVATE clause must be definable.
• FORTRAN pointers, Cray* pointers, and assumed-size arrays may not appear in a FIRSTPRIVATE clause.
• Variables that appear in namelist statements, in variable format expressions, and in expressions for statement function definitions, may not appear in a FIRSTPRIVATE clause.

#include <stdio.h>
#include <omp.h>

int sum = 0;
int a[100] = {0};
int *pntr = a;

int main(int argc, char **argv)
{
    int i;

    #pragma omp parallel for firstprivate(pntr) reduction(+:sum)
    for (i = 1; i < 100; i++) {
        // INCORRECT: firstprivate variable must not have a reference type
        sum = sum + *pntr;
    }
    return 0;
}