Tweaked the debug building and printing a little - I hope this works OK for everyone. Let me know if not.

Tamped down a few warnings.
For the demo/server Makefile, made an either/or choice between executable size optimization (normal) or gdb debug info and no optimization.

bacnet-stack/demo/server/Makefile

@@ -37,19 +37,27 @@ LIBRARY1=-L$(BACNET_LIB_DIR),-l$(BACNET_LIB_NAME)
 LIBRARY2=-lws2_32,-lgcc,-lm,-liphlpapi,-lwinmm
 LIBRARIES=$(LIBRARY1),$(LIBRARY2)
 endif
+
 #build for release (default) or debug
-DEBUGGING =
-OPTIMIZATION = -Os
 ifeq (${BUILD},debug)
+# Use -g to put info for gdb in the executable
+DEBUGGING = -g -DDEBUG_ENABLED=1
 OPTIMIZATION = -O0
-DEBUGGING = -g
+LINK_OPTIMIZATION = 
 ifeq (${BACDL_DEFINE},-DBACDL_BIP=1)
 DEFINES += -DBIP_DEBUG
 endif
+else 
+DEBUGGING =
+# Use -f optimizations and then link option --gc-sections to reduce executable size.
+# Of course, not when you want debug output for gdb!
+OPTIMIZATION = -Os -fdata-sections -ffunction-sections
+LINK_OPTIMIZATION = -Wl,--gc-sections
 endif
+
 # put all the flags together
-CFLAGS = -Wall $(DEBUGGING) $(OPTIMIZATION) $(INCLUDES) $(DEFINES) -fdata-sections -ffunction-sections
-LFLAGS = -Wl,-Map=$(TARGET).map,$(LIBRARIES),--gc-sections
+CFLAGS = -Wall $(DEBUGGING) $(OPTIMIZATION) $(INCLUDES) $(DEFINES) 
+LFLAGS = -Wl,-Map=$(TARGET).map,$(LIBRARIES) $(LINK_OPTIMIZATION)
 
 SRCS = main.c