* 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.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@50770 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index b97a1a4..40c1e0d 100644 (file)
--- 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 31b5baa..6f67e3d 100644 (file)
--- 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 1d5dc90..cea204e 100644 (file)
--- 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 3b18306..c65803b 100644 (file)
--- 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 (file)
index 0000000..60ceb4f
--- /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;
+}