1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr19984.c b/gcc/testsuite/gcc.dg/pr19984.c
new file mode 100644
index 000000000..5323c461f
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr19984.c
@@ -0,0 +1,17 @@
+/* PR c/19984 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -std=c99" } */
+
+
+double nan (const char *);
+
+const double nok = nan ("");	/* { dg-warning "(not a constant)|(near initialization)" } */
+
+const double ok = __builtin_nan ("");
+
+double
+foo ()
+{
+  double ok2 = nan ("");
+  return ok2;
+}