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From: "mrestelli at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/63867] New: LEN is lost for a CHARACTER variable inside SELECT TYPE
Date: Fri, 14 Nov 2014 11:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63867

            Bug ID: 63867
           Summary: LEN is lost for a CHARACTER variable inside SELECT
                    TYPE
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mrestelli at gmail dot com

Consider the following code:

program p
 implicit none

 character(len=5) :: str

 str = 'abcde'
 call checklen1(str)
 call checklen2(str)

contains

 subroutine checklen1(s)
  character(len=*), intent(in) :: s

   call checklen2(s)

 end subroutine checklen1

 subroutine checklen2(s)
  class(*), intent(in) :: s

   select type(s)
    type is(character(len=*))
     write(*,*) "Len is ",len(s)
     write(*,*) "s is   ",s
   end select

 end subroutine checklen2

end program p


When compiled with gfortran it prints

$ ./test
 Len is            0
 s is   
 Len is            5
 s is   abcde

while the expected output is twice the same, i.e.

$ ./test
 Len is            5
 s is   abcde
 Len is            5
 s is   abcde


I.e., inside the SELECT TYPE the lenght of the string is lost, but
only when the actual argument is itself a dummy argument with LEN=* .


 $ gfortran --version
GNU Fortran (GCC) 5.0.0 20141114 (experimental)


Marco