re PR c++/41863 (segfault with sizeof in template parameter)

Fix PR c++/41863

gcc/cp/ChangeLog:

	PR c++/41863
	* pt.c (iterative_hash_template_arg): articifial parms
	don't have DECL_PARM_INDEX set. Do not hash it.

gcc/testsuite/ChangeLog:

	PR c++/41863
	* g++.dg/template/sizeof12.C: New test.

From-SVN: r153735

gcc/cp/ChangeLog

+2009-10-30  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/41863
+	* pt.c (iterative_hash_template_arg): articifial parms
+	don't have DECL_PARM_INDEX set. Do not hash it.
+
 2009-10-28  Jerry Quinn  <jlquinn@optonline.net>
 
 	* mangle.c (mangle_type_string_for_rtti): Revert r149964.

gcc/cp/pt.c

@@ -1501,7 +1501,8 @@ iterative_hash_template_arg (tree arg, hashval_t val)
       }
 
     case PARM_DECL:
-      val = iterative_hash_object (DECL_PARM_INDEX (arg), val);
+      if (!DECL_ARTIFICIAL (arg))
+	val = iterative_hash_object (DECL_PARM_INDEX (arg), val);
       return iterative_hash_template_arg (TREE_TYPE (arg), val);
 
     case TARGET_EXPR:

gcc/testsuite/ChangeLog

+2009-10-30  Dodji Seketeli  <dodji@redhat.com>
+
+	PR c++/41863
+	* g++.dg/template/sizeof12.C: New test.
+
 2009-10-29  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gnat.dg/pack14.adb: New test.

gcc/testsuite/g++.dg/template/sizeof12.C

+// Contributed by Dodji Seketeli <dodji@redhat.com>
+// Origin PR c++/41863
+
+template<int X>
+struct Bar
+{
+};
+
+template<typename T>
+class Foo
+{
+  T m_foo;
+
+  void
+  crash()
+  {
+    Bar<sizeof(m_foo)> bar;
+  }
+};