re PR fortran/31559 ([4.1 only] Assigning to an EXTERNAL leads to ICE)

2007-04-13  Tobias Burnus  <burnus@net-b.de>

	PR fortran/31559
	* primary.c (match_variable): External functions
	are no variables.

2007-04-13  Tobias Burnus  <burnus@net-b.de>

	PR fortran/31559
	* gfortran.dg/func_assign.f90: New test.

From-SVN: r123793

gcc/fortran/ChangeLog

+2007-04-13  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/31559
+	* primary.c (match_variable): External functions
+	are no variables.
+
 2007-04-13  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/31550

gcc/fortran/primary.c

@@ -2420,7 +2420,8 @@ match_variable (gfc_expr **result, int equiv_flag, int host_flag)
 
     case FL_PROCEDURE:
       /* Check for a nonrecursive function result */
-      if (sym->attr.function && (sym->result == sym || sym->attr.entry))
+      if (sym->attr.function && (sym->result == sym || sym->attr.entry)
+	  && !sym->attr.external)
 	{
 	  /* If a function result is a derived type, then the derived
 	     type may still have to be resolved.  */

gcc/testsuite/ChangeLog

+2007-04-13  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/31559
+	* gfortran.dg/func_assign.f90: New test.
+
 2007-04-13  Paul Thomas  <pault@gcc.gnu.org>
 
 	PR fortran/31550

gcc/testsuite/gfortran.dg/func_assign.f90

+! { dg-do compile }
+!
+! PR fortran/31559
+! Do not allow assigning to external functions
+!
+! Contributed by Steve Kargl <sgk@troutmask.apl.washington.edu>
+!
+module mod
+  implicit none
+contains
+  integer function bar()
+    bar = 4
+  end function bar
+
+  subroutine a() 
+   implicit none
+   real :: fun
+   external fun
+   interface
+     function funget(a)
+       integer :: a
+     end function
+     subroutine sub()
+     end subroutine sub
+   end interface
+   sub = 'a'  ! { dg-error "Expected VARIABLE" }
+   fun = 4.4  ! { dg-error "Expected VARIABLE" }
+   funget = 4 ! { dg-error "is not a VALUE" }
+   bar = 5    ! { dg-error "is not a VALUE" }
+  end subroutine a
+end module mod
+
+end