Problems with 18.1 and ALIAS attribute

Dear Fortran Forum,

i got a problem with the ifort 18 Update 1 Compiler. It seems the way the alias attribute is handled in submodules has changed. I can't get my code to compile with the alias attribute. I need it, to keep downward compatibility of the dll. Is this new behavior intended or a bug?

Greetings
Wolf

module M_MOD
  implicit none

  type T_TYPE

    contains
!    procedure, nopass :: foo ! This works without ALIAS
    procedure, nopass :: foo_renamed=>foo ! This works in none of my tests with 18.1

  end type

interface
  module subroutine foo()
!    !DEC$ ATTRIBUTES ALIAS:"foo" :: foo
    !DEC$ ATTRIBUTES DLLEXPORT :: foo

  end subroutine
end interface

end module


submodule (M_MOD) S_MOD
  implicit none

contains
  module subroutine foo()
    ! IFORT 16 to 18.0 give "error #7286: This symbol has multiply declared DEC$ ATTRIBUTES ALIAS attribute.   [FOO]"
!    !DEC$ ATTRIBUTES ALIAS:"foo" :: foo ! Until 18.1 it worked without this line
    !DEC$ ATTRIBUTES DLLEXPORT :: foo

  end subroutine

end submodule


module M_USING_M_MOD
  use M_MOD
  implicit none

contains

  subroutine bar()

    type(T_TYPE) :: T_TYPE_INSTANCE

    ! IFORT 18.1 gives Link error: "error LNK2019: unresolved external symbol "M_MOD_mp_FOO" in function "M_USING_M_MOD_mp_BAR""
!    call T_TYPE_INSTANCE%foo()

    ! IFORT 18.1 gives Link error: "error LNK2019: unresolved external symbol "M_MOD_mp_FOO_RENAMED" in function "M_USING_M_MOD_mp_BAR""
    call T_TYPE_INSTANCE%foo_renamed()

  end subroutine

end module