diff --git a/gcc/testsuite/gcc.dg/gnu-predef-1.c b/gcc/testsuite/gcc.dg/gnu-predef-1.c
new file mode 100644
index 00000000000..9c7eebf75eb
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/gnu-predef-1.c
@@ -0,0 +1,14 @@
+/* Test that we diagnose the __FUNCTION__ and the __PRETTY_FUNCTION__
+   predefined identifiers in pedantic mode.  */
+/* { dg-do compile } */
+/* { dg-options "-std=gnu11 -pedantic" } */
+
+void
+foo (void)
+{
+  const char *s;
+  s = __FUNCTION__; /* { dg-warning " ISO C does not support .__FUNCTION__. predefined identifier" } */
+  s = __PRETTY_FUNCTION__; /* { dg-warning " ISO C does not support .__PRETTY_FUNCTION__. predefined identifier" } */
+  s = __extension__ __FUNCTION__;
+  s = __extension__ __PRETTY_FUNCTION__;
+}