Ignore LWIP_PLATFORM_ASSERT when running tests

ports/unix/check/Makefile

@@ -33,7 +33,7 @@ CODEDIR=../../../../lwip
 LWIPDIR=$(CODEDIR)/src
 
 LDFLAGS:=$(LDFLAGS) -lcheck
-CFLAGS:=$(CFLAGS) -I/usr/include/check -I$(LWIPDIR)/../test/unit \
+CFLAGS:=$(CFLAGS) -DLWIP_UNIX_EMPTY_ASSERT -I/usr/include/check -I$(LWIPDIR)/../test/unit \
 	-I$(LWIPDIR)/include -I$(LWIPDIR)/include/ipv4 \
 	-I$(LWIPDIR)/include/ipv6 -Iunix/include -I. -I../include
 

ports/unix/include/arch/cc.h

@@ -82,8 +82,12 @@ typedef unsigned long mem_ptr_t;
 /* Plaform specific diagnostic output */
 #define LWIP_PLATFORM_DIAG(x)	do {printf x;} while(0)
 
+#ifdef LWIP_UNIX_EMPTY_ASSERT
+#define LWIP_PLATFORM_ASSERT(x)
+#else
 #define LWIP_PLATFORM_ASSERT(x) do {printf("Assertion \"%s\" failed at line %d in %s\n", \
                                      x, __LINE__, __FILE__); fflush(NULL); abort();} while(0)
+#endif
 
 #define LWIP_RAND() ((u32_t)rand())