[Bug fortran/84543] New: undefined reference to __copy_INTEGER_4_.3788

[neil.n.carlson at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84543

            Bug ID: 84543
           Summary: undefined reference to __copy_INTEGER_4_.3788
           Product: gcc
           Version: 8.0.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: neil.n.carlson at gmail dot com
  Target Milestone: ---

I stumbled across this problem while reducing an actual error to a minimal test
case (PR84539).  I wasn't going to bother reporting it (it seems a bit too
silly) but reconsidered. Maybe this means something significant to a developer;
I'll let you decide.

$ cat bug.f90
class(*), allocatable :: x
x = 42
end

$ gfortran bug.f90
/tmp/cclHGRhz.o:(.rodata+0x60): undefined reference to `__copy_INTEGER_4_.3788'
collect2: error: ld returned 1 exit status

And similar with a real or character value, and presumably with any of the
kinds that gfortran supports. The link error goes away if you add a TYPE IS
clause for the type of the value; e.g.

class(*), allocatable :: x
x = 42
select type (x)
type is (integer)
end select
end