From 6d7e0b337c16421a460ab0594db67bdecb377c67 Mon Sep 17 00:00:00 2001
From: Kumar Gala <kumar.gala@linaro.org>
Date: Thu, 12 Jul 2018 13:13:53 -0500
Subject: [PATCH] Print sign of NaN values to nano-vfprintf.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
---
 newlib/libc/stdio/nano-vfprintf_float.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/newlib/libc/stdio/nano-vfprintf_float.c b/newlib/libc/stdio/nano-vfprintf_float.c
index 98893e97b..071a09edc 100644
--- a/newlib/libc/stdio/nano-vfprintf_float.c
+++ b/newlib/libc/stdio/nano-vfprintf_float.c
@@ -213,6 +213,8 @@ _printf_float (struct _reent *data,
     }
   if (isnan (_fpvalue))
     {
+      if (_fpvalue < 0)
+	pdata->l_buf[0] = '-';
       if (code <= 'G')		/* 'A', 'E', 'F', or 'G'.  */
 	cp = "NAN";
       else