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[Patch, Fortran] PR 47377 reject nonpointer expr data-target in pointer assignment>


A rather obvious patch for an ICE occurring for invalid code:

ptr => f()

requires that "f()" returns a pointer. Currently, gfortran first happily accepts "f()" if the result variable has the target attribute - and then it ICEs. (Cf. PR for the quotes from the standard.)

Build on x86-64-linux and currently regtesting (so far successfully).
OK for the trunk?

Tobias
2011-01-20  Tobias Burnus  <burnus@net-b.de>

	PR fortran/47377
	* expr.c (gfc_check_pointer_assign): Reject expr data-targets
	without pointer attribute.

2011-01-20  Tobias Burnus  <burnus@net-b.de>

	PR fortran/47377
	* gfortran.dg/pointer_target_4.f90: New.

diff --git a/gcc/fortran/expr.c b/gcc/fortran/expr.c
index 3f1141a..a4e48c8 100644
--- a/gcc/fortran/expr.c
+++ b/gcc/fortran/expr.c
@@ -3507,6 +3507,15 @@ gfc_check_pointer_assign (gfc_expr *lvalue, gfc_expr *rvalue)
     lvalue->symtree->n.sym->attr.subref_array_pointer = 1;
 
   attr = gfc_expr_attr (rvalue);
+
+  if (rvalue->expr_type == EXPR_FUNCTION && !attr.pointer)
+    {
+      gfc_error ("Pointer assignment target expression "
+		 "at %L must deliver a pointer result",
+		 &rvalue->where);
+      return FAILURE;
+    }
+
   if (!attr.target && !attr.pointer)
     {
       gfc_error ("Pointer assignment target is neither TARGET "
diff --git a/gcc/testsuite/gfortran.dg/pointer_target_4.f90 b/gcc/testsuite/gfortran.dg/pointer_target_4.f90
new file mode 100644
index 0000000..cda3453
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/pointer_target_4.f90
@@ -0,0 +1,15 @@
+! { dg-do compile }
+!
+! PR fortran/47377
+!
+! Contributed by <thenlich@users.sourceforge.net>
+!
+program testgferr
+    real, pointer :: y
+    y => f()  ! { dg-error "must deliver a pointer result" }
+contains
+    function f()
+      real :: f
+      f = 5
+    end function f
+end program testgferr

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