$ cat test.f90 subroutine foo include 'omp_lib.h' end subroutine $ gfortran -Wall -c test.f90 omp_lib.h:389:47: Warning: Variable 'depobj_list' at (1) is a dummy argument of the BIND(C) procedure 'omp_target_memcpy_async' but may not be C interoperable [-Wc-binding-type] omp_lib.h:429:58: Warning: Variable 'depobj_list' at (1) is a dummy argument of the BIND(C) procedure 'omp_target_memcpy_rect_async' but may not be C interoperable [-Wc-binding-type]