1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/nested-func-3.c b/gcc/testsuite/gcc.dg/nested-func-3.c
new file mode 100644
index 00000000000..c4c016cfc4b
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/nested-func-3.c
@@ -0,0 +1,20 @@
+/* Undefined nested function should be a error, whether or not the
+   function is called.  Bug 17807.  */
+/* Origin: Joseph Myers <joseph@codesourcery.com> */
+/* { dg-do compile } */
+/* { dg-options "" } */
+
+void
+f (void)
+{
+  auto int fn (int); /* { dg-error "error: nested function 'fn' declared but never defined" } */
+  auto int fn2 (int); /* { dg-error "error: nested function 'fn2' declared but never defined" } */
+  sizeof(fn(1));
+}
+
+void
+h (void)
+{
+  auto int hn (int); /* { dg-error "error: nested function 'hn' declared but never defined" } */
+  hn (1);
+}