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From: "fortranfan at outlook dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/104520] New: Unexpected behavior with STORAGE_SIZE
 intrinsic with a dummy argument that is unlimited polymorphic
Date: Sun, 13 Feb 2022 17:47:18 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104520

            Bug ID: 104520
           Summary: Unexpected behavior with STORAGE_SIZE intrinsic with a
                    dummy argument that is unlimited polymorphic
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: fortranfan at outlook dot com
  Target Milestone: ---

Consider the following:

--- begin code ---
module m
   use, intrinsic :: iso_fortran_env, only : character_storage_size
contains
   subroutine sub( a )
      class(*), intent(in) :: a
      print *, "storage_size(s) =3D ", storage_size(a)
      select type ( a )
         type is ( character(len=3D*) )
            print *, "expected is ", len(a)*character_storage_size
      end select
   end subroutine=20
end module
   use m=20
   character(len=3D2) :: s
   call sub( s )
end
--- end code ---

And the program behavior using gfortran:
--- begin console output ---
C:\temp>gfortran -Wall y.f90 -o y.exe

C:\temp>y.exe
 storage_size(s) =3D            8
 expected is           16

C:\temp>
--- end output ---

On the other hand, consider the following:

--- begin code ---
   character(len=3D2) :: s
   print *, storage_size(s)
end
--- end code ---

The program behavior is

--- begin output ---
C:\temp>gfortran -Wall y.f90 -o y.exe

C:\temp>y.exe
          16

C:\temp>
--- end output ---

I failed to find anything in the Fortran standard that supports the above s=
hown
program behavior.  Can the first case with the unlimited polymorphic dummy =
be
expected to the same as the second, meaning the storage size of the object =
get
determined as 16 bits?

Thank you,
Vipul Parekh=