[Bug fortran/41714] [OOP] ALLOCATE SOURCE= does not properly copy the value from SOURCE

["janus at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #5 from janus at gcc dot gnu dot org  2009-10-25 10:24 -------
(In reply to comment #4)
> internal compiler error: in tree_annotate_all_with_location, at gimplify.c:892

This goes away with the following patchlet:

Index: gcc/fortran/trans-expr.c
===================================================================
--- gcc/fortran/trans-expr.c    (Revision 153538)
+++ gcc/fortran/trans-expr.c    (Arbeitskopie)
@@ -4888,7 +4888,10 @@ gfc_build_memcpy_call (tree dst, tree src, tree le
   /* Construct call to __builtin_memcpy.  */
   tmp = build_call_expr_loc (input_location,
                         built_in_decls[BUILT_IN_MEMCPY], 3, dst, src, len);
-  return fold_convert (void_type_node, tmp);
+  if (TREE_CODE (tmp) == NOP_EXPR)
+    return tmp;
+  else
+    return fold_convert (void_type_node, tmp);
 }


The source of the problem was that the memcpy call

  (void) __builtin_memcpy ((void *) cp.$data, (void *) &x, 8);

is being replaced at -O1 by:

  (*(struct t2 * {ref-all}) SAVE_EXPR <cp.$data> = x;, (void *) SAVE_EXPR
<cp.$data>;);

which 'gfc_build_memcpy_call' was not able to cope with. I.e. the
'fold_convert' would produce an COMPOUND_EXPR, which later on would trigger the
error in 'tree_annotate_all_with_location'.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41714