[Bug fortran/53521] New: Memory leak with zero sized array constructor

["Joost.VandeVondele at mat dot ethz.ch" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53521

             Bug #: 53521
           Summary: Memory leak with zero sized array constructor
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: Joost.VandeVondele@mat.ethz.ch


The following testcase (as reduced from CP2K) leaks memory when compiled with
gfortran 4.6 - 4.8 :

MODULE TEST
 IMPLICIT NONE
CONTAINS
 SUBROUTINE T(n1)
  INTEGER :: n1(:)
 END SUBROUTINE T
 SUBROUTINE T2(n)
   INTEGER :: n
   INTEGER :: k
   CALL T((/(k,k=1,n-1)/))
 END SUBROUTINE
END MODULE
USE TEST
  CALL T2(1)
END 

as can be verified with valgrind or putting a loop around call t2. The issue
seems to be the zero-sized array constructor.