https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80046
Bug ID: 80046
Summary: Explicit interface required for at (1): pointer
argument
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: joachim.herb at gmx dot de
Target Milestone: ---
This is a sibling bug report to
https://software.intel.com/en-us/forums/intel-visual-fortran-compiler-for-windows/topic/720770
The following code does not compile with gfortran (and as reported above with
the newest versions of ifort). Nevertheless, I think it should be valid code.
Here it is:
module impl_list__
implicit none
type, public :: Node_t
integer :: val
procedure(), nopass, pointer :: cloneProc_int
end type
interface
subroutine NodeCloner( tgt, src )
import Node_t
type(Node_t), pointer, intent(out) :: tgt
type(Node_t), intent(in) :: src
end subroutine
end interface
procedure(), pointer :: cloneProc => null()
type(Node_t) :: node
end module
subroutine func()
use impl_list__
implicit none
procedure(NodeCloner), pointer :: cloneNode, cloneNode_int
cloneNode_int => node%cloneProc_int
cloneNode => cloneProc
end subroutine
The compilation with gfortran results in the following error message (tested
with different versions: 5.2.0, 5.4.0, 7.0.0 20161030):
~/winhpc> gfortran --version
GNU Fortran (GCC) 7.0.0 20161030 (experimental)
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
~/winhpc> gfortran -c list_test_v2.f90
list_test_v2.f90:29:17:
cloneNode => cloneProc
1
Error: Explicit interface required for 'cloneproc' at (1): pointer argument
The code tests the use of two procedure pointers. One is stored inside a user
defined type, the other is defined within the module. gfortran in all version
accepts the pointer inside the user defined type but not the one defined
directly in the module. Ifort before version 17.0.0 accepts both pointers. The
compilation fails for both pointers if the version is 17.0.0 or newer (also
tested 17.0.2).
~/winhpc> ifort --version
ifort (IFORT) 17.0.0 20160721
Copyright (C) 1985-2016 Intel Corporation. All rights reserved.
~/winhpc> ifort -c list_test_v2.f90
list_test_v2.f90(28): error #6138: An explicit interface is required in this
context. [CLONENODE_INT]
cloneNode_int => node%cloneProc_int
----^
list_test_v2.f90(29): error #6138: An explicit interface is required in this
context. [CLONENODE]
cloneNode => cloneProc
----^
compilation aborted for list_test_v2.f90 (code 1)
Is this an intended behavior? If so, what would be the correct way to handle
such pointers? Otherwise, is this a bug?
