1 files changed, 26 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/cpp/vararg1.c b/gcc/testsuite/gcc.dg/cpp/vararg1.c
new file mode 100644
index 000000000..38bf56bd0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/cpp/vararg1.c
@@ -0,0 +1,26 @@
+/* { dg-do run } */
+/* { dg-options -w } */
+
+/* count() used to give 1 owing to a buggy test for varargs.  */
+#define count(y...)  count1 ( , ##y)
+#define count1(y...) count2 (y,1,0)
+#define count2(_,x0,n,y...) n
+#if count() != 0 || count(A) != 1
+#error Incorrect vararg argument counts
+#endif
+
+/* Test for changed behavior of the GNU varargs extension.
+   ##args, where args is a rest argument which received zero tokens,
+   used to delete the previous sequence of nonwhitespace characters.
+   Now it deletes the previous token.  */
+
+#include <string.h>
+
+#define S(str, args...) "  " str "\n", ##args
+
+int
+main()
+{
+  const char *s = S("foo");
+  return strchr (s, '\n') == NULL;
+}