re PR c++/56419 (transactions in for-loops disappear)

	PR c++/56419
	* semantics.c (begin_transaction_stmt): Set TREE_SIDE_EFFECTS.
	(build_transaction_expr): Same.

From-SVN: r196282

gcc/cp/ChangeLog

+2013-02-25  Aldy Hernandez  <aldyh@redhat.com>
+
+	PR c++/56419
+	* semantics.c (begin_transaction_stmt): Set TREE_SIDE_EFFECTS.
+	(build_transaction_expr): Same.
+
 2013-02-25  Jason Merrill  <jason@redhat.com>
 
 	PR c++/56377

gcc/cp/semantics.c

@@ -5108,6 +5108,7 @@ begin_transaction_stmt (location_t loc, tree *pcompound, int flags)
 			 "transactional memory support enabled")));
 
   TRANSACTION_EXPR_BODY (r) = push_stmt_list ();
+  TREE_SIDE_EFFECTS (r) = 1;
   return r;
 }
 
@@ -5157,6 +5158,7 @@ build_transaction_expr (location_t loc, tree expr, int flags, tree noex)
   ret = build1 (TRANSACTION_EXPR, TREE_TYPE (expr), expr);
   if (flags & TM_STMT_ATTR_RELAXED)
 	TRANSACTION_EXPR_RELAXED (ret) = 1;
+  TREE_SIDE_EFFECTS (ret) = 1;
   SET_EXPR_LOCATION (ret, loc);
   return ret;
 }

gcc/testsuite/g++.dg/tm/pr56419.C

+// { dg-do compile }
+// { dg-options "-fgnu-tm" }
+
+int x = 0;
+int inc_func(int i) {
+     for (int j = 0; j < i; ++j)
+     {
+         __transaction_atomic { x+=1; }
+     }
+     return 0;
+}
+
+// { dg-final { scan-assembler "ITM_commitTransaction" } }