Allow minimal unix target to build in cygwin (but not necessarily run).

Applied a patch from Marc Boucher which has the following changes:

1) Fixed sys_arch.txt documentation to have new return type from
   sys_thread_new.

2) Removed unnecessary casts on calling sys_timeout() in certain files.

3) Removed some unnecessary break statements after return statements.

4) Changed sys_timeout_remove() to sys_untimeout().

5) Added some forgotten #ifndef SYS_LIGHTWEIGHT_PROT to memp.c

6) Changed LWIP_DIAG and LWIP_PLATFORM_ASSERT to have do while().

ports/coldfire/include/arch/cc.h

@@ -30,7 +30,7 @@
  * 
  * Author: Adam Dunkels <adam@sics.se>
  *
- * $Id: cc.h,v 1.4 2003/02/12 22:02:02 davidhaas Exp $
+ * $Id: cc.h,v 1.5 2003/02/18 19:27:08 davidhaas Exp $
  */
 #ifndef __CC_H__
 #define __CC_H__
@@ -99,12 +99,12 @@ typedef	struct _types_fd_set {
 #include <stdlib.h>
 /* Plaform specific diagnostic output */
 #ifndef LWIP_PLATFORM_DIAG
-#define LWIP_PLATFORM_DIAG(x)	{printf x;}
+#define LWIP_PLATFORM_DIAG(x)	do {printf x;} while(0)
 #endif
 
 #ifndef LWIP_PLATFORM_ASSERT
-#define LWIP_PLATFORM_ASSERT(x)  {printf("Assertion \"%s\" failed at line %d in %s\n", \
-                                     x, __LINE__, __FILE__); fflush(NULL); abort();}
+#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
 
 

ports/unix/include/arch/cc.h

@@ -60,8 +60,8 @@ typedef u32_t mem_ptr_t;
 #include <stdio.h>
 #include <stdlib.h>
 /* Plaform specific diagnostic output */
-#define LWIP_PLATFORM_DIAG(x)	{printf x;}
+#define LWIP_PLATFORM_DIAG(x)	do {printf x;} while(0)
 
-#define LWIP_PLATFORM_ASSERT(x)  {printf("Assertion \"%s\" failed at line %d in %s\n", \
-                                     x, __LINE__, __FILE__); fflush(NULL); abort();}
+#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 /* __ARCH_CC_H__ */

ports/unix/proj/minimal/Makefile

@@ -31,7 +31,10 @@
  
 CCDEP=gcc
 CC=gcc
-CFLAGS=-g -Wall -DIPv4 -Os -fpack-struct
+#To Compile for linux: make ARCH=linux
+#To Compile for cygwin: make ARCH=cygwin
+ARCH=unix
+CFLAGS=-g -Wall -D$(ARCH) -DIPv4 -Os -fpack-struct
 ARFLAGS=rs
 
 CONTRIBDIR=../../../..