--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/cpp/trad/macroargs.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,44 @@
+/* Test that whitespace in arguments is preserved, and that each
+   newline in macro arguments become a space.  */
+
+/* { dg-do run } */
+
+#define f(x, y) "x y"
+#define g(x) x
+
+extern void abort (void);
+extern int strcmp (const char *, const char *);
+
+void testquoting ()
+{
+  const char *str1 = f("a", "\"a\"");
+  const char *str2 = f( \t, " \t");
+
+  if (strcmp (str1, "\"a\"  \"\\\"a\\\"\""))
+    abort ();
+  if (strcmp (str2, " \t  \" \\t\""))
+    abort ();
+}
+
+int main ()
+{
+  const char *str1 = f( foo ,bar);
+  const char *str2 = f(
+foo
+,bar);
+
+  if (strcmp (str1, " foo  bar"))
+    abort ();
+
+  if (strcmp (str1, str2))
+    abort ();
+
+  /* Verify that quoted state is preserved over a newline.  */
+  if (strcmp (g /* { dg-bogus "unterminated 2" } */ ("1
+, 2"), "1 , 2"))	
+    abort ();
+
+  testquoting ();
+
+  return 0;
+}