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From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/96986] [8/9/10/11 Regression] Explicit interface
 required: volatile argument for ENTRY subroutine
Date: Fri, 01 Jan 2021 20:04:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96986

--- Comment #2 from anlauf at gcc dot gnu.org ---
F2018 has:

! 15.4.2.2 Explicit interface

! Within the scope of a procedure identifier, the procedure shall have an
! explicit interface if it is not a statement function and

! (3) the procedure has a dummy argument that
!     (a) has the ALLOCATABLE, ASYNCHRONOUS, OPTIONAL, POINTER, TARGET, VAL=
UE,
!         or VOLATILE attribute,

So I'd say the code in comment#0 is invalid, although the compiler is not
required to diagnose this.

If you agree, we will close the issue as INVALID.=