ifndef CONTIKI
  ${error CONTIKI not defined! You must specify where CONTIKI resides}
endif

ifeq ($(TARGET),)
  -include Makefile.target
  ifeq ($(TARGET),)
    ${info TARGET not defined, using target 'native'}
    TARGET=native
  else
    ${info using saved target '$(TARGET)'}
  endif
endif

ifeq ($(DEFINES),)
  -include Makefile.$(TARGET).defines
  ifneq ($(DEFINES),)
    ${info using saved defines '$(DEFINES)'}
  endif
endif

usage:
	@echo "make MAKETARGETS... [TARGET=(TARGET)] [savetarget] [targets]"

targets:
	@ls -1 $(CONTIKI)/platform | grep -v CVS

savetarget:
	-@rm -f Makefile.target
	@echo "saving Makefile.target"
	@echo >Makefile.target "TARGET = $(TARGET)"

savedefines:
	-@rm -f Makefile.$(TARGET).defines
	@echo "saving Makefile.$(TARGET).defines"
	@echo >Makefile.$(TARGET).defines "DEFINES = $(DEFINES)"

OBJECTDIR = obj_$(TARGET)
ifeq (${wildcard $(OBJECTDIR)},)
  DUMMY := ${shell mkdir $(OBJECTDIR)}
endif

LOWERCASE = -abcdefghijklmnopqrstuvwxyz
UPPERCASE = _ABCDEFGHIJKLMNOPQRSTUVWXYZ
TARGET_UPPERCASE := ${shell echo $(TARGET) | sed 'y!$(LOWERCASE)!$(UPPERCASE)!'}
CFLAGS += -DCONTIKI_TARGET_$(TARGET_UPPERCASE)

include $(CONTIKI)/core/net/rime/Makefile.rime
include $(CONTIKI)/core/net/mac/Makefile.mac
SYSTEM  = process.c procinit.c autostart.c elfloader.c profile.c \
          timetable.c timetable-aggregate.c compower.c serial-line.c
THREADS = mt.c
LIBS    = memb.c timer.c list.c etimer.c energest.c rtimer.c stimer.c \
          print-stats.c ifft.c crc16.c random.c checkpoint.c ringbuf.c

ifdef UIP_CONF_IPV6
CFLAGS += -DUIP_CONF_IPV6
  UIP   = uip6.c tcpip.c psock.c uip-udp-packet.c uip-split.c \
          uip-over-mesh.c resolv.c hc.c tcpdump.c uiplib.c
  NET   = $(UIP) uip-icmp6.c uip-nd6.c uip-nd6-io.c uip-netif.c sicslowpan.c
else # UIP_CONF_IPV6
  UIP   = uip.c uiplib.c resolv.c tcpip.c psock.c hc.c uip-split.c uip-fw.c \
          uip-fw-drv.c uip_arp.c tcpdump.c uip-neighbor.c uip-udp-packet.c \
          uip-over-mesh.c #rawpacket-udp.c
  NET   = $(UIP) uaodv.c uaodv-rt.c
endif # UIP_CONF_IPV6

CTK     = ctk.c
CTKVNC  = $(CTK) ctk-vncserver.c libconio.c vnc-server.c vnc-out.c ctk-vncfont.c

ifndef CONTIKI_NO_NET
  CONTIKIFILES = $(SYSTEM) $(LIBS) $(NET) $(THREADS) $(DHCP)
else
  CONTIKIFILES = $(SYSTEM) $(LIBS) $(THREADS) sicslowpan.c fakeuip.c
endif

CONTIKI_SOURCEFILES += $(CONTIKIFILES)

CONTIKIDIRS += ${addprefix $(CONTIKI)/core/,dev lib net net/mac net/rime sys \
                 cfs ctk lib/ctk loader . }

oname = ${patsubst %.c,%.o,${patsubst %.S,%.o,$(1)}}

CONTIKI_OBJECTFILES = ${addprefix $(OBJECTDIR)/,${call oname, $(CONTIKI_SOURCEFILES)}}

PROJECT_OBJECTFILES = ${addprefix $(OBJECTDIR)/,${call oname, $(PROJECT_SOURCEFILES)}}

### Include application makefiles
ifdef APPS
  APPDIRS += ${wildcard ${addprefix $(CONTIKI)/apps/, $(APPS)} \
                ${addprefix $(CONTIKI)/platform/$(TARGET)/apps/, $(APPS)}}
  APPINCLUDES = ${foreach APP, $(APPS), ${wildcard \
                 $(CONTIKI)/apps/$(APP)/Makefile.$(APP) \
                 $(CONTIKI)/platform/$(TARGET)/apps/$(APP)/Makefile.$(APP)}}
  -include $(APPINCLUDES)
  APP_SOURCES = ${foreach APP, $(APPS), $($(APP)_src)}
  DSC_SOURCES = ${foreach APP, $(APPS), $($(APP)_dsc)}
  CONTIKI_SOURCEFILES += $(APP_SOURCES) $(DSC_SOURCES)
endif

### Include target makefile (TODO Unsafe?)
target_makefile := $(wildcard $(CONTIKI)/platform/$(TARGET)/Makefile.$(TARGET))

# Check if the target makefile exists
ifeq ($(strip $(target_makefile)),)
  ${error The target platform "$(TARGET)" does not exist (maybe it was misspelled?)}
else
  include $(CONTIKI)/platform/$(TARGET)/Makefile.$(TARGET)
endif

### Forward comma-separated list of arbitrary defines to the compiler

COMMA := ,
CFLAGS += ${addprefix -D,${subst $(COMMA), ,$(DEFINES)}}

### Setup directory search path for source and header files

CONTIKI_TARGET_DIRS_CONCAT = ${addprefix $(CONTIKI)/platform/$(TARGET)/, \
                               $(CONTIKI_TARGET_DIRS)}
CONTIKI_CPU_DIRS_CONCAT    = ${addprefix $(CONTIKI_CPU)/, \
                               $(CONTIKI_CPU_DIRS)}

SOURCEDIRS = . $(PROJECTDIRS) $(CONTIKI_TARGET_DIRS_CONCAT) \
             $(CONTIKI_CPU_DIRS_CONCAT) $(CONTIKIDIRS) $(APPDIRS)

vpath %.c $(SOURCEDIRS)
vpath %.S $(SOURCEDIRS)

CFLAGS += ${addprefix -I,$(SOURCEDIRS)}

### Automatic dependency generation

ifneq ($(MAKECMDGOALS),clean)
-include ${addprefix $(OBJECTDIR)/,$(CONTIKI_SOURCEFILES:.c=.d) \
				   $(PROJECT_SOURCEFILES:.c=.d)}
endif

clean:
	rm -f *~ *core core *.srec \
	*.lst *.map \
        *.cprg *.bin *.data contiki*.a *.firmware core-labels.S *.ihex *.ini \
        *.ce *.co $(CLEAN)
	-rm -rf $(OBJECTDIR)

ifndef CUSTOM_RULE_C_TO_CE
%.ce: %.c
	$(CC) $(CFLAGS) -DAUTOSTART_ENABLE -c $< -o $@
	$(STRIP) --strip-unneeded -g -x $@
endif

ifndef CUSTOM_RULE_C_TO_OBJECTDIR_O
$(OBJECTDIR)/%.o: %.c
	$(CC) $(CFLAGS) -c $< -o $@
endif

ifndef CUSTOM_RULE_S_TO_OBJECTDIR_O
$(OBJECTDIR)/%.o: %.S
	$(AS) $(ASFLAGS) -o $@ $<
endif

ifndef CUSTOM_RULE_C_TO_O
%.o: %.c
	$(CC) $(CFLAGS) -c $< -o $@
endif

ifndef CUSTOM_RULE_C_TO_CO
%.co: %.c
	$(CC) $(CFLAGS) -DAUTOSTART_ENABLE -c $< -o $@
endif

ifndef AROPTS
  AROPTS = rcf
endif

ifndef CUSTOM_RULE_ALLOBJS_TO_TARGETLIB
contiki-$(TARGET).a: $(CONTIKI_OBJECTFILES)
	$(AR) $(AROPTS) $@ $^
endif

ifndef CCDEP
  CCDEP = $(CC)
endif
ifndef CDEPFLAGS
  CDEPFLAGS = $(CFLAGS)
endif

ifndef CUSTOM_RULE_C_TO_OBJECTDIR_D
$(OBJECTDIR)/%.d: %.c
	@echo Making dependencies for $<; set -e; rm -f $@; \
	$(CCDEP) -MM $(CDEPFLAGS) $< > $@.$$$$; \
	sed 's,\($*\)\.o[ :]*,$(OBJECTDIR)/\1.o $@ : ,g' < $@.$$$$ > $@; \
	rm -f $@.$$$$
endif

ifndef LD
  LD = $(CC)
endif

ifndef CUSTOM_RULE_LINK
%.$(TARGET): %.co $(PROJECT_OBJECTFILES) $(PROJECT_LIBRARIES) contiki-$(TARGET).a
	$(LD) $(LDFLAGS) $(TARGET_STARTFILES) ${filter-out %.a,$^} ${filter %.a,$^} $(TARGET_LIBFILES) -o $@
endif

# Don't treat %.$(TARGET) as an intermediate file because it is
# in fact the primary target.
.PRECIOUS: %.$(TARGET)

# Cancel the predefined implict rule for compiling and linking
# a single C source into a binary to force GNU make to consider
# the match-anything rule below instead.
%: %.c

# Match-anything pattern rule to allow the project makefiles to
# abstract from the actual binary name. It needs to contain some
# command in order to be a rule, not just a prerequisite.
%: %.$(TARGET)
	@