From c71c9882c22a53c994469fe26b1e0511c4a403d6 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Wed, 8 Mar 2017 20:30:48 +0100
Subject: [PATCH] arch.h: include <limits.h> if it exists (at least INT_MAX is
 used)

(cherry picked from commit aff1935e409df720e004e6c83d81d50fbc4465d8)
---
 src/include/lwip/arch.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/src/include/lwip/arch.h b/src/include/lwip/arch.h
index 884dccbc..55714e11 100644
--- a/src/include/lwip/arch.h
+++ b/src/include/lwip/arch.h
@@ -162,6 +162,19 @@ typedef uintptr_t mem_ptr_t;
 #endif
 #endif
 
+/** Define this to 1 in arch/cc.h of your port if your compiler does not provide
+ * the limits.h header. You need to define the type limits yourself in this case
+ * (e.g. INT_MAX).
+ */
+#ifndef LWIP_NO_LIMITS_H
+#define LWIP_NO_LIMITS_H 0
+#endif
+
+/* Include limits.h? */
+#if !LWIP_NO_LIMITS_H
+#include <limits.h>
+#endif
+
 /** C++ const_cast<target_type>(val) equivalent to remove constness from a value (GCC -Wcast-qual) */
 #ifndef LWIP_CONST_CAST
 #define LWIP_CONST_CAST(target_type, val) ((target_type)((ptrdiff_t)val))