Merge pull request #4997 from kjbracey-arm/lwip_debug

Correct LWIP_DEBUG definition

Author: theotherjimmy

features/FEATURE_LWIP/lwip-interface/lwipopts.h

@@ -76,10 +76,9 @@
 #error "Either IPv4 or IPv6 must be preferred."
 #endif
 
-#if defined(MBED_CONF_LWIP_DEBUG_ENABLED)
-#define LWIP_DEBUG                  MBED_CONF_LWIP_DEBUG_ENABLED
-#else
-#define LWIP_DEBUG                  0
+#undef  LWIP_DEBUG
+#if MBED_CONF_LWIP_DEBUG_ENABLED
+#define LWIP_DEBUG                  1
 #endif
 
 #if NO_SYS == 0
@@ -100,7 +99,7 @@
 #define MBED_CONF_LWIP_TCPIP_THREAD_STACKSIZE      1200
 #endif
 
-#if LWIP_DEBUG
+#ifdef LWIP_DEBUG
 #define TCPIP_THREAD_STACKSIZE      MBED_CONF_LWIP_TCPIP_THREAD_STACKSIZE*2
 #else
 #define TCPIP_THREAD_STACKSIZE      MBED_CONF_LWIP_TCPIP_THREAD_STACKSIZE
@@ -118,7 +117,7 @@
 #define MBED_CONF_LWIP_PPP_THREAD_STACKSIZE    768
 #endif
 
-#if LWIP_DEBUG
+#ifdef LWIP_DEBUG
 #define DEFAULT_THREAD_STACKSIZE    MBED_CONF_LWIP_DEFAULT_THREAD_STACKSIZE*2
 #define PPP_THREAD_STACK_SIZE       MBED_CONF_LWIP_PPP_THREAD_STACKSIZE*2
 #else
@@ -258,7 +257,7 @@
 #define ETHARP_DEBUG                LWIP_DBG_OFF
 #define UDP_LPC_EMAC                LWIP_DBG_OFF
 
-#if LWIP_DEBUG
+#ifdef LWIP_DEBUG
 #define MEMP_OVERFLOW_CHECK         1
 #define MEMP_SANITY_CHECK           1
 #define LWIP_DBG_TYPES_ON           LWIP_DBG_ON