[Bug fortran/15208] New: Accessing a variable passed to a subroutineafter an inferior call is not possible

["keven.boell at intel dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15208

             Bug #: 15208
           Summary: Accessing a variable passed to a subroutine after an
                    inferior call is not possible
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: fortran
        AssignedTo: unassigned@sourceware.org
        ReportedBy: keven.boell@intel.com
    Classification: Unclassified


Created attachment 6905
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6905
reproducer/dejagnu test in a single patch

When trying to call a subroutine which has a parameter, using an inferior call,
GDB is not able to read the variable correctly. Instead a "error reading
variable: Cannot access memory at address" message is shown.

The simple test program [1] below was compiled using gfortran 4.6.3 with -g.
Additionally you'll find a simple dejagnu test as a single patch attached,
which reproduces the issue.

After starting the program in GDB, the user may try to call the subroutine
"sub" using an inferior call and pass a value to it. At the variable read (w =
v) a SIGSEGV will be reported to the user:

(gdb) call sub(42)
Program received signal SIGSEGV, Segmentation fault.
0x00000000004005d0 in s2 (v=<error reading variable: Cannot access memory at
address 0x2a>) at ic.f90:5


[1] Simple test program:
--
subroutine sub (v)
    implicit none
    INTEGER, intent(in) :: v
    INTEGER :: w
    w = v
    return
END subroutine

PROGRAM inferior
    implicit none

    CALL sub(5)
END PROGRAM inferior

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