* c-typeck.c (mark_exp_read): Handle C_MAYBE_CONST_EXPR.
* c-parser.c (c_parser_postfix_expression): Call mark_exp_read on
statement expression.
* c-c++-common/Wunused-var-9.c: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@160318
138bc75d-0d04-0410-961f-
82ee72b054a4
--- /dev/null
+/* { dg-options "-Wunused" } */
+/* { dg-do compile } */
+
+int f1 (int *, int);
+int f2 (int *);
+int f3 (int *);
+
+int
+f4 (int x)
+{
+ int a, n = 0;
+ int b;
+ for (a = f1 (&b, x); f2 (&b); (void) (a = f3 (&b)))
+ n++;
+ return n;
+}
+
+void
+f5 (int x)
+{
+ int a;
+ a = x;
+ (void) (a = x);
+}
+
+void
+f6 (int x)
+{
+ int a; /* { dg-warning "set but not used" } */
+ a = x;
+}
+
+void
+f7 (int x)
+{
+ int a;
+ ({ a = x; });
+}
+
+int
+f8 (int x)
+{
+ int a;
+ int b = ({ a = x; });
+ return b;
+}
+
+int v;
+
+void
+f9 (int x)
+{
+ int a;
+ ({ v++, a = x; });
+}
+
+int
+f10 (int x)
+{
+ int a;
+ int b = ({ v++, a = x; });
+ return b;
+}
+
+void
+f11 (int x)
+{
+ int a;
+ a = x;
+ ({ v++, a; });
+}
+
+int
+f12 (int x)
+{
+ int a;
+ a = x;
+ int b = ({ v++, a; });
+ return b;
+}