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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/55854] ICE on intent(out) dummy argument with unlimited polymorphic component
Date: Thu, 03 Jan 2013 14:47:00 -0000
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X-Bugzilla-Keywords: ice-on-invalid-code
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55854

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> 2013-01-03 14:46:54 UTC ---
The problem seems to be the "gfc_class_null_initializer", where "ts" is
unlimited polymorphic and "init_expr" is of type "__class__$tar_a" (and
EXPR_NULL). The latter leads to the generation of __vtab_CLASS_0_ with the
associated _copy function.

Besides the wrong type, the generation _copy is triggered very late, namely in
gfc_trans_deferred_vars-> gfc_trans_structure_assign. That's the reason for
using the wrong scope and - hence - for the ICE.


Patch:

--- a/gcc/fortran/class.c
+++ b/gcc/fortran/class.c
@@ -414,7 +414,7 @@ gfc_class_null_initializer (gfc_typespec *ts, gfc_expr
*init_expr)
       && ts->u.derived->components->ts.u.derived->attr.unlimited_polymorphic;

   if (is_unlimited_polymorphic && init_expr)
-    vtab = gfc_find_intrinsic_vtab (&(init_expr->ts));
+    vtab = gfc_find_intrinsic_vtab (&ts->u.derived->components->ts);
   else
     vtab = gfc_find_derived_vtab (ts->u.derived);