First attempt to clean-up Makefiles.

1. Top (main) makefile defines build configuration variables and export them for sub-makes to use. BAC_ROUTING is defined here - is has been removed from config.h.
2. A new makefile has been added in demo subdirectory. It builds the demo applications. NOTE: the 'ports' target is not build.

bacnet-stack/demo/Makefile

@@ -0,0 +1,69 @@
+
+# Directories
+BACNET_PORT = linux
+BACNET_PORT_DIR = ../../ports/${BACNET_PORT}
+BACNET_INCLUDE = ../../include
+# BACnet Library
+BACNET_LIB_DIR = ../../lib
+BACNET_LIB_NAME = bacnet
+BACNET_LIB_TARGET = $(BACNET_LIB_DIR)/lib$(BACNET_LIB_NAME).a
+# Compiler Setup
+INCLUDES = -I$(BACNET_INCLUDE) -I$(BACNET_PORT_DIR)
+ifeq (${BACNET_PORT},linux)
+PFLAGS = -pthread
+TARGET_EXT =
+LIBRARIES=-lc,-lgcc,-lrt,-lm,-L$(BACNET_LIB_DIR),-l$(BACNET_LIB_NAME)
+endif
+ifeq (${BACNET_PORT},win32)
+TARGET_EXT = .exe
+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)
+OPTIMIZATION = -O0
+DEBUGGING = -g
+endif
+# put all the flags together
+CFLAGS = -Wall $(DEBUGGING) $(OPTIMIZATION) $(INCLUDES) $(DEFINES)
+LFLAGS = -Wl,$(LIBRARIES)
+
+.EXPORT_ALL_VARIABLES:
+
+SUBDIRS = readprop writeprop readfile writefile reinit server dcc \
+	whohas whois ucov timesync epics readpropm mstpcap
+
+ifneq (,$(findstring BAC_ROUTING=1,$(BACNET_DEFINES)))
+	SUBDIRS += whoisrouter iamrouter initrouter gateway
+endif
+
+
+.PHONY : all $(SUBDIRS) clean
+
+all : $(SUBDIRS)
+	@echo "utilities are in the bin directory"
+
+$(SUBDIRS) :
+	$(MAKE) -C $@
+
+clean :
+	for dir in $(SUBDIRS); do \
+		$(MAKE) -C $$dir clean; \
+	done
+
+# Add "ports" to the build, if desired
+ports:	atmega168 bdk-atxx4-mstp at91sam7s
+	@echo "Built the ports"
+
+atmega168: ports/atmega168/Makefile
+	make -C ports/atmega168 clean all
+
+at91sam7s: ports/at91sam7s/makefile
+	make -C ports/at91sam7s clean all
+
+bdk-atxx4-mstp: ports/bdk-atxx4-mstp/Makefile
+	make -C ports/bdk-atxx4-mstp clean all
+