From: Jakub Jelinek <jakub@redhat.com>
Date: Thu, 14 Mar 2002 14:26:56 +0000 (+0100)
Subject: call.c (build_over_call): Set TREE_NO_UNUSED_WARNING too.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d3f129b340ca8a3b6d67518791ea962db9c3e3f8;p=gcc.git

call.c (build_over_call): Set TREE_NO_UNUSED_WARNING too.

	* call.c (build_over_call): Set TREE_NO_UNUSED_WARNING too.
	* cvt.c (convert_to_void): Preserve TREE_NO_UNUSED_WARNING.

	* g++.dg/warn/Wunused-1.C: New test.

From-SVN: r50770
---

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index b97a1a44310..40c1e0d61fe 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2002-03-14  Jakub Jelinek  <jakub@redhat.com>
+
+	* call.c (build_over_call): Set TREE_NO_UNUSED_WARNING too.
+	* cvt.c (convert_to_void): Preserve TREE_NO_UNUSED_WARNING.
+
 2002-03-12  Richard Sandiford  <rsandifo@redhat.com>
 
 	* mangle.c (write_builtin_type): Handle 128-bit integers even if
diff --git a/gcc/cp/call.c b/gcc/cp/call.c
index 31b5baaf3fe..6f67e3d7b51 100644
--- a/gcc/cp/call.c
+++ b/gcc/cp/call.c
@@ -4305,6 +4305,7 @@ build_over_call (cand, args, flags)
 	     Ideally, the notions of having side-effects and of being
 	     useless would be orthogonal.  */
 	  TREE_SIDE_EFFECTS (val) = 1;
+	  TREE_NO_UNUSED_WARNING (val) = 1;
 	}
       else
 	val = build (MODIFY_EXPR, TREE_TYPE (to), to, arg);
diff --git a/gcc/cp/cvt.c b/gcc/cp/cvt.c
index 1d5dc90955e..cea204e29dc 100644
--- a/gcc/cp/cvt.c
+++ b/gcc/cp/cvt.c
@@ -852,6 +852,7 @@ convert_to_void (expr, implicit)
 	    tree t = build (COMPOUND_EXPR, TREE_TYPE (new_op1),
 			    TREE_OPERAND (expr, 0), new_op1);
 	    TREE_SIDE_EFFECTS (t) = TREE_SIDE_EFFECTS (expr);
+	    TREE_NO_UNUSED_WARNING (t) = TREE_NO_UNUSED_WARNING (expr);
 	    expr = t;
 	  }
 
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 3b18306aa6b..c65803b6a43 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,7 @@
+2002-03-14  Jakub Jelinek  <jakub@redhat.com>
+
+	* g++.dg/warn/Wunused-1.C: New test.
+
 2002-02-13  Richard Sandiford  <rsandifo@redhat.com>
 
 	* g++.dg/abi/mangle6.C: New test.
diff --git a/gcc/testsuite/g++.dg/warn/Wunused-1.C b/gcc/testsuite/g++.dg/warn/Wunused-1.C
new file mode 100644
index 00000000000..60ceb4f076d
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-1.C
@@ -0,0 +1,15 @@
+// Test whether -Wunused handles empty classes the same as non-empty.
+// { dg-do compile }
+// { dg-options "-Wunused" }
+
+struct A {};
+struct B { char c; };
+
+void foo ()
+{
+  struct A a0, a1;
+  struct B b0, b1 = { 25 };
+
+  a0 = a1;	// { dg-bogus "value computed is not used" }
+  b0 = b1;
+}