re PR fortran/30235 ([4.1 only] missing alternate return argument with explicit…

re PR fortran/30235 ([4.1 only] missing alternate return argument with explicit interface causes segfault)

fortran/
	PR 30235
	* interface.c (compare_actual_formal): check for
	alternate returns when iterating over non-present
	arguments.

testsuite/
	PR 30235
	* gfortran.dg/altreturn_2.f90: new test.

From-SVN: r120447

gcc/fortran/ChangeLog

 2007-01-04  Brooks Moses  <brooks.moses@codesourcery.com>
 
+	PR 30235
+	* interface.c (compare_actual_formal): check for
+	alternate returns when iterating over non-present
+	arguments.
+
+2007-01-04  Brooks Moses  <brooks.moses@codesourcery.com>
+
 	* invoke.texi: Update manpage copyright to include 2007.
 
 2007-01-04  Brooks Moses  <brooks.moses@codesourcery.com>

gcc/fortran/interface.c

@@ -1455,6 +1455,13 @@ compare_actual_formal (gfc_actual_arglist ** ap,
     {
       if (new[i] != NULL)
 	continue;
+      if (f->sym == NULL)
+	{
+	  if (where)
+	    gfc_error ("Missing alternate return spec in subroutine call at %L",
+		       where);
+	  return 0;
+	}
       if (!f->sym->attr.optional)
 	{
 	  if (where)

gcc/testsuite/ChangeLog

+2006-01-04  Brooks Moses  <brooks.moses@codesourcery.com>
+
+	PR 30235
+	* gfortran.dg/altreturn_2.f90: new test.
+
 2007-01-04  Tom Tromey  <tromey@redhat.com>
 
 	PR preprocessor/28165:

gcc/testsuite/gfortran.dg/altreturn_2.f90

+! { dg-do compile }
+       program altreturn_2
+         call foo()  ! { dg-error "Missing alternate return" }
+       contains
+         subroutine foo(*)
+           return
+         end subroutine
+       end program