################################################################
#  macros
################################################################
IMAGE = $(BUILDDIR)/downloadme

AS     = arm-elf-as
CC     = arm-elf-gcc
LD     = arm-elf-ld
GDB    = arm-elf-gdb-eclipse
SIMCMD = sh -c "VisualBoyAdvance-SDL.exe -Gtcp &"

ASFLAGS = -g
CFLAGS  = -g -O0 -mcpu=arm7tdmi -fno-builtin -mlittle-endian
LDFLAGS = -nostartfiles -nodefaultlibs -nostdlibs -static -T arm7.link 



INCDIR   = inc 
COMDIR   = inc\_common




SRCDIR   = src


BUILDDIR = build

C_SOURCES_ABS   = $(wildcard src/*.c) $(wildcard src/*/*.c)
ASM_SOURCES_ABS = $(ASM_SOURCES:%=$(SRCDIR)/%)
OBJECTS         = $(ASM_SOURCES_ABS:$(SRCDIR)/%.asm=$(BUILDDIR)/%.o) \
                  $(C_SOURCES_ABS:$(SRCDIR)/%.c=$(BUILDDIR)/%.o)

C_INC   = $(INCDIR:%=-I %) $(COMDIR:%=-I %)  

ASM_INC = $(INCDIR:%=-I %)

################################################################
#  rules
################################################################
rebuild : clean all



clean :
	@echo Deleting '$(BUILDDIR)' and its contents
	rm -f $(BUILDDIR)/*.o $(BUILDDIR)/*.elf $(BUILDDIR)/*.map $(BUILDDIR)/.gdbinit
	@echo
	@echo Finished building '$@'
	@echo



all : $(BUILDDIR) $(IMAGE).elf
	@echo
	@echo Finished building '$@'
	@echo
	@echo $(SRCDIR)



$(IMAGE).elf : Makefile arm7.link $(BUILDDIR)/.gdbinit $(C_SOURCES_ABS) $(ASM_SOURCES_ABS) $(OBJECTS)

	@echo Linking '$@'
	$(LD) -Map $(IMAGE).map $(OBJECTS) $(LDFLAGS) -o $@
	@echo




test : $(BUILDDIR) $(IMAGE).elf
	@echo Starting simulator and debugger
	$(GDB) -x $(BUILDDIR)/.gdbinit -w
	@echo
	@echo Debug session ended
	@echo



$(BUILDDIR)/.gdbinit : Makefile
	@echo Preparing gdb startup script '$@'
	@echo 'shell $(SIMCMD)'                  > $@
	@echo "file $(IMAGE).elf -readnow"      >> $@
	@echo "target remote :55555"            >> $@
#	@echo "set trust-readonly-sections on"  >> $@
	@echo "set osabi none"                  >> $@
	@echo "load"                            >> $@
	@echo "jump *0"                         >> $@
	@echo "b *0"                            >> $@
	@echo



$(OBJECTS) $(BUILDDIR)/.gdbinit : Makefile



$(BUILDDIR)/%.o : $(SRCDIR)/%.c
	@echo Compiling $<
	$(CC) $(C_INC) -c $(CFLAGS) $< -o $@
	@echo



$(BUILDDIR)/%.o : $(SRCDIR)/%.asm
	@echo Assembling $<
	$(AS) $(ASFLAGS) $(ASM_INC) $< -o $@
	@echo



$(BUILDDIR) :
	@echo Creating directory '$@'
	mkdir $@
	@echo