From 03e9c88488dda0933d35e5c502db9a88deb62ab9 Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Tue, 5 Apr 2016 21:04:06 +0200
Subject: [PATCH] fixed bug #47625 (Error in compilation of C++ source using
 netifapi macros) by changing NULL define for __cplusplus

---
 src/include/lwip/def.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/include/lwip/def.h b/src/include/lwip/def.h
index 49571363..3bd0db84 100644
--- a/src/include/lwip/def.h
+++ b/src/include/lwip/def.h
@@ -53,8 +53,12 @@ extern "C" {
 #define LWIP_ARRAYSIZE(x) (sizeof(x)/sizeof((x)[0]))
 
 #ifndef NULL
+#ifdef __cplusplus
+#define NULL 0
+#else
 #define NULL ((void *)0)
 #endif
+#endif
 
 /* Endianess-optimized shifting of two u8_t to create one u16_t */
 #if BYTE_ORDER == LITTLE_ENDIAN