re PR libfortran/31210 (I/O of string with (non-constant) zero length)

	PR libfortran/31210
	* gfortran.dg/zero_length_1.f90: New test.

From-SVN: r124429

gcc/testsuite/ChangeLog

+2007-05-04  Francois-Xavier Coudert <fxcoudert@gcc.gnu.org>
+
+	PR libfortran/31210
+	* gfortran.dg/zero_length_1.f90: New test.
+
 2007-05-04  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/31803

gcc/testsuite/gfortran.dg/zero_length_1.f90

+! { dg-do run }
+! PR libfortran/31210
+program test
+  implicit none
+  integer :: l = 0
+  character(len=20) :: s
+  
+  write(s,'(A,I1)') foo(), 0
+  if (trim(s) /= "0") call abort
+
+contains
+
+  function foo()
+    character(len=l) :: foo
+    foo = "XXXX"
+  end function
+
+end program test