--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/cpp/va-opt.c	Thu Oct 25 07:37:49 2018 +0900
@@ -0,0 +1,42 @@
+/* { dg-do compile } */
+/* { dg-options "-std=gnu99" { target c } } */
+/* { dg-options "-std=c++2a" { target c++ } } */
+
+extern void f0 (void);
+extern void f1 (int);
+extern void f2 (int, int);
+extern void f3 (int, int, int);
+extern void f4 (int, int, int, int);
+extern int s (const char *);
+
+#define CALL(F, ...) F (7 __VA_OPT__(,) __VA_ARGS__)
+#define CP(F, X, Y, ...) F (__VA_OPT__(X ## Y,) __VA_ARGS__)
+#define CS(F, ...) F(__VA_OPT__(s(# __VA_ARGS__)))
+#define D(F, ...) F(__VA_OPT__(__VA_ARGS__) __VA_OPT__(,) __VA_ARGS__)
+#define CALL0(...) __VA_OPT__(f2)(0 __VA_OPT__(,)__VA_ARGS__)
+
+void t (void)
+{
+  CALL (f1);
+  CALL (f1, );
+  CALL (f2, 1);
+  CALL (f3, 1, 2);
+
+  int one = 1;
+  int two = 2;
+  int onetwo = 23;
+
+  CP (f0, one, two);
+  CP (f0, one, two, );
+  CP (f2, one, two, 3);
+
+  CS (f0);
+  CS (f1, 1, 2, 3, 4);
+
+  D (f0);
+  D (f2, 1);
+  D (f4, 1, 2);
+
+  CALL0 ();
+  CALL0 (23);
+}