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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/104913] New: [OpenMP] Bogus 'unused variable' with 'omp depobj'
Date: Mon, 14 Mar 2022 11:23:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104913

            Bug ID: 104913
           Summary: [OpenMP] Bogus 'unused variable' with 'omp depobj'
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: diagnostic, openmp
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

The following C code shows the warning

foo.c:6:7: warning: unused variable =E2=80=98x=E2=80=99 [-Wunused-variable]
    6 |   int x;
      |       ^

but the variable is used in 'depend(inout: x)'.

(No warning for the Fortran code, which is fine. Found when looking at
https://github.com/SOLLVE/sollve_vv/pull/493 which then uses obj with
omp_target_memcpy_async.)


-----------------------
#include <omp.h>

void
foo ()
{
  int x;
  omp_depend_t obj;
  #pragma omp depobj(obj) depend(inout: x)
}
-----------------------
subroutine foo
  use omp_lib
  implicit none
  integer :: x
  integer(omp_depend_kind) obj
  !$omp depobj(obj) depend(inout: x)
end=