#---------------------------------------------------------------------------------
.SUFFIXES:
#---------------------------------------------------------------------------------

ifeq ($(strip $(DEVKITARM)),)
$(error "Please set DEVKITARM in your environment. export DEVKITARM=<path to>devkitARM")
endif

include $(DEVKITARM)/3ds_rules

#---------------------------------------------------------------------------------
# TARGET is the name of the output
# BUILD is the directory where object files & intermediate files will be placed
# SOURCES is a list of directories containing source code
# DATA is a list of directories containing data files
# INCLUDES is a list of directories containing header files
# SPECS is the directory containing the important build and link files
#---------------------------------------------------------------------------------
export TARGET		:=	$(shell basename $(CURDIR))
BUILD		:=	build
SOURCES		:=	source source/fatfs source/gamecart
DATA		:=	data
INCLUDES	:=	source

#---------------------------------------------------------------------------------
# Setup some defines
#---------------------------------------------------------------------------------

#---------------------------------------------------------------------------------
# options for code generation
#---------------------------------------------------------------------------------
ARCH	:=	-march=armv5te -mtune=arm946e-s -mthumb -mthumb-interwork

CFLAGS	:=	-g -Wall -Wextra -Wpedantic -O2 -flto\
			-fomit-frame-pointer\
			-ffast-math -std=c11\
			$(ARCH)

CFLAGS	+=	$(INCLUDE) -DARM9 -Werror-implicit-function-declaration -Wcast-align \
			-Wcast-qual -Wdisabled-optimization -Wformat=2 -Winit-self \
			-Wlogical-op -Wmissing-declarations -Wmissing-include-dirs \
			-Wredundant-decls -Wshadow -Wsign-conversion -Wstrict-overflow=5 \
			-Wswitch-default -Wundef -Wno-unused

CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions

ASFLAGS	:=	-g $(ARCH)
LDFLAGS	=	-nostartfiles -g --specs=../stub.specs $(ARCH) -Wl,-Map,$(TARGET).map
OCFLAGS	=	--set-section-flags .bss=alloc,load,contents

LIBS	:=

ifeq ($(EXEC_METHOD),BRAHMA)
	CFLAGS += -DBRAHMA #can't use CPPFLAGS because 3ds_rules doesn't use them
else ifeq ($(EXEC_METHOD), A9LH)
	CFLAGS += -DA9LH #can't use CPPFLAGS because 3ds_rules doesn't use them
endif

#---------------------------------------------------------------------------------
# list of directories containing libraries, this must be the top level containing
# include and lib
#---------------------------------------------------------------------------------
LIBDIRS	:=

#---------------------------------------------------------------------------------
# no real need to edit anything past this point unless you need to add additional
# rules for different file extensions
#---------------------------------------------------------------------------------
ifneq ($(BUILD),$(notdir $(CURDIR)))
#---------------------------------------------------------------------------------

export OUTPUT	:=	$(CURDIR)/$(TARGET)

export VPATH	:=	$(foreach dir,$(SOURCES),$(CURDIR)/$(dir)) \
			$(foreach dir,$(DATA),$(CURDIR)/$(dir))

export DEPSDIR	:=	$(CURDIR)/$(BUILD)

CFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.c)))
CPPFILES	:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.cpp)))
SFILES		:=	$(foreach dir,$(SOURCES),$(notdir $(wildcard $(dir)/*.s)))
BINFILES	:=	$(foreach dir,$(DATA),$(notdir $(wildcard $(dir)/*.*)))

#---------------------------------------------------------------------------------
# use CXX for linking C++ projects, CC for standard C
#---------------------------------------------------------------------------------
ifeq ($(strip $(CPPFILES)),)
#---------------------------------------------------------------------------------
	export LD	:=	$(CC)
#---------------------------------------------------------------------------------
else
#---------------------------------------------------------------------------------
	export LD	:=	$(CXX)
#---------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------

export OFILES	:= $(addsuffix .o,$(BINFILES)) \
			$(CPPFILES:.cpp=.o) $(CFILES:.c=.o) $(SFILES:.s=.o)

export INCLUDE	:=	$(foreach dir,$(INCLUDES),-I$(CURDIR)/$(dir)) \
			$(foreach dir,$(LIBDIRS),-I$(dir)/include) \
			-I$(CURDIR)/$(BUILD)

export LIBPATHS	:=	$(foreach dir,$(LIBDIRS),-L$(dir)/lib)

.PHONY: common clean all brahma a9lh release

#---------------------------------------------------------------------------------
all: release

common:
	@[ -d $(BUILD) ] || mkdir -p $(BUILD)

a9lh: common
	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile EXEC_METHOD=A9LH
	@mv $(OUTPUT).bin uncart_arm9loaderhax.bin

brahma: common
	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile EXEC_METHOD=BRAHMA
	@mv $(OUTPUT).bin uncart_brahma.bin

release:
	@rm -fr $(BUILD) $(OUTPUT).bin $(OUTPUT).elf
	@make --no-print-directory a9lh
	@rm -fr $(BUILD) $(OUTPUT).bin $(OUTPUT).elf
	@make --no-print-directory brahma

#---------------------------------------------------------------------------------
clean:
	@echo clean ...
	@rm -fr $(BUILD) $(OUTPUT).elf $(OUTPUT).bin uncart_arm9loaderhax.bin \
		uncart_brahma.bin


#---------------------------------------------------------------------------------
else

DEPENDS	:=	$(OFILES:.o=.d)

#---------------------------------------------------------------------------------
# main targets
#---------------------------------------------------------------------------------
$(OUTPUT).bin	:	$(OUTPUT).elf
$(OUTPUT).elf	:	$(OFILES)


#---------------------------------------------------------------------------------
%.bin: %.elf
	@$(OBJCOPY) $(OCFLAGS) -O binary $< $@
	@echo built ... $(notdir $@)


-include $(DEPENDS)


#---------------------------------------------------------------------------------------
endif
#---------------------------------------------------------------------------------------