flang/test/Semantics/call24.f90

   1 ! RUN: %python %S/test_errors.py %s %flang_fc1
   2 ! 15.4.2.2. Test that errors are reported when an explicit interface
   3 ! is not provided for an external procedure that requires an explicit
   4 ! interface (the definition needs to be visible so that the compiler
   5 ! can detect the violation).
   6
   7 subroutine foo(a_pointer)
   8   real, pointer :: a_pointer(:)
   9 end subroutine
  10
  11 subroutine bar(a_pointer)
  12   procedure(real), pointer :: a_pointer
  13 end subroutine
  14
  15 subroutine baz(proc)
  16   external :: proc
  17   real, optional :: proc
  18 end subroutine
  19
  20 subroutine test()
  21   real, pointer :: a_pointer(:)
  22   real, pointer :: an_array(:)
  23   intrinsic :: sin
  24
  25   ! This call would be allowed if the interface was explicit here,
  26   ! but its handling with an implicit interface is different (no
  27   ! descriptor involved, copy-in/copy-out...)
  28
  29   !ERROR: References to the procedure 'foo' require an explicit interface
  30   call foo(a_pointer)
  31
  32   ! This call would be error if the interface was explicit here.
  33
  34   !ERROR: References to the procedure 'foo' require an explicit interface
  35   call foo(an_array)
  36
  37   !ERROR: References to the procedure 'bar' require an explicit interface
  38   !WARNING: If the procedure's interface were explicit, this reference would be in error
  39   !BECAUSE: Actual argument associated with procedure pointer dummy argument 'a_pointer=' must be a POINTER unless INTENT(IN)
  40   call bar(sin)
  41
  42   !ERROR: References to the procedure 'baz' require an explicit interface
  43   call baz(sin)
  44 end subroutine