From 7fd7263dc9212bcf694e951327a9b33872158d37 Mon Sep 17 00:00:00 2001
From: Jakub Jelinek <jakub@redhat.com>
Date: Mon, 28 Jun 2010 22:12:31 +0200
Subject: [PATCH] =?UTF-8?q?re=20PR=20c++/44682=20(warning:=20variable=20?=
 =?UTF-8?q?=E2=80=98x=E2=80=99=20set=20but=20not=20used)?=
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	PR c++/44682
	* class.c (build_base_path): If want_pointer, call mark_rvalue_use
	on expr.

	* g++.dg/warn/Wunused-var-14.C: New test.

From-SVN: r161511
---
 gcc/cp/ChangeLog                           |  6 ++++++
 gcc/cp/class.c                             |  2 ++
 gcc/testsuite/ChangeLog                    |  5 +++++
 gcc/testsuite/g++.dg/warn/Wunused-var-14.C | 17 +++++++++++++++++
 4 files changed, 30 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/warn/Wunused-var-14.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 3b5f1bd82de..a7df7b8b1c6 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,9 @@
+2010-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44682
+	* class.c (build_base_path): If want_pointer, call mark_rvalue_use
+	on expr.
+
 2010-06-28  Steven Bosscher  <steven@gcc.gnu.org>
 
 	* init.c: Do not include except.h.
diff --git a/gcc/cp/class.c b/gcc/cp/class.c
index f945923ddc4..51f749f61b0 100644
--- a/gcc/cp/class.c
+++ b/gcc/cp/class.c
@@ -283,6 +283,8 @@ build_base_path (enum tree_code code,
   if (!want_pointer)
     /* This must happen before the call to save_expr.  */
     expr = cp_build_unary_op (ADDR_EXPR, expr, 0, tf_warning_or_error);
+  else
+    mark_rvalue_use (expr);
 
   offset = BINFO_OFFSET (binfo);
   fixed_type_p = resolves_to_fixed_type_p (expr, &nonnull);
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 5f0ea3fbd1e..e3558942969 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c++/44682
+	* g++.dg/warn/Wunused-var-14.C: New test.
+
 2010-06-28  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/43298
diff --git a/gcc/testsuite/g++.dg/warn/Wunused-var-14.C b/gcc/testsuite/g++.dg/warn/Wunused-var-14.C
new file mode 100644
index 00000000000..a552b56dad1
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-var-14.C
@@ -0,0 +1,17 @@
+// PR c++/44682
+// { dg-do compile }
+// { dg-options "-Wunused" }
+
+struct S { virtual ~S () {} };
+struct T { virtual ~T () {} };
+struct U : S, T {};
+
+void f (U &);
+
+void
+g (void *v)
+{
+  T *t = static_cast <T *> (v);
+  U *u = static_cast <U *> (t);
+  f (*u);
+}