[Bug middle-end/110639] [OpenMP][5.1] Predefined firstprivate for pointers - attachment missing

[burnus at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110639

--- Comment #1 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Testing shows that the offsets are correctly handled but that there is an
ordering problem. Example:

int
main ()
{
  int a[100] = {};
  int *p = &a[0];
  uintptr_t iptr;
  #pragma omp target map(a, iptr)
    iptr = (uintptr_t) p;

This will fail - as the implicitly added 'firstprivate' arrives too early at
GOMP_target_ext - before 'a' is mapped:

   map(alloc:MEM[(char *)p] [len: 0])
     map(firstprivate:p [pointer assign, bias: 0])
       map(tofrom:iptr [len: 8])
         map(tofrom:a [len: 400])

If 'a' is already present on the device (e.g. 'omp target enter data map(a)'),
it works.

Solution: The implicitly mapped C/C++ pointer variable 'p' must be added at the
end of the clauses.