# SPDX-License-Identifier: CC0-1.0
#
# SPDX-FileContributor: Antonio Niño Díaz, 2023
export BLOCKSDS			?= /opt/wonderful/thirdparty/blocksds/core
export BLOCKSDSEXT		?= /opt/wonderful/thirdparty/blocksds/external
export WONDERFUL_TOOLCHAIN	?= /opt/wonderful
ARM_NONE_EABI_PATH		?= $(WONDERFUL_TOOLCHAIN)/toolchain/gcc-arm-none-eabi/bin/

SOURCEDIRS	:= misc/ds
INCLUDEDIRS	:=
DSIWIFI		:= third_party/dsiwifi

ifdef BUILD_DSI
SOURCEDIRS	+= $(DSIWIFI)/arm_iop/source $(DSIWIFI)/common/source $(DSIWIFI)/arm_iop/source/ath $(DSIWIFI)/arm_iop/source/crypto $(DSIWIFI)/arm_iop/source/ieee
INCLUDEDIRS	+= $(DSIWIFI)/arm_iop/source  $(DSIWIFI)/arm_iop/include $(DSIWIFI)/common/source $(DSIWIFI)/include $(DSIWIFI)/include/lwip
BUILDDIR	:= build-dsi
LIBS		:= -lc -lnds7
LIBDIRS		:= $(BLOCKSDS)/libs/libnds
else
BUILDDIR	:= build-nds
LIBS		:= -lc -lnds7 -ldswifi7
LIBDIRS		:= $(BLOCKSDS)/libs/libnds $(BLOCKSDS)/libs/dswifi
endif

NAME		:= cc-arm7
ELF		:= $(BUILDDIR)/$(NAME).elf
MAP		:= $(BUILDDIR)/$(NAME).map

PREFIX		:= $(ARM_NONE_EABI_PATH)arm-none-eabi-
CC		:= $(PREFIX)gcc
CXX		:= $(PREFIX)g++
LD		:= $(CC)

DEFINES		:= -D__NDS__ -DARM7
ARCH		:= -mcpu=arm7tdmi -mtune=arm7tdmi
WARNFLAGS	:= -Wall

# Source files
# ------------
S_FILES		:= $(foreach dir,$(SOURCEDIRS),$(wildcard $(dir)/*.s))
C_FILES		:= $(foreach dir,$(SOURCEDIRS),$(wildcard $(dir)/*.c))


INCLUDEFLAGS	:= $(foreach path,$(INCLUDEDIRS),-I$(path)) \
		   $(foreach path,$(LIBDIRS),-I$(path)/include)

LIBDIRSFLAGS	:= $(foreach path,$(LIBDIRS),-L$(path)/lib)

ASFLAGS		+= -x assembler-with-cpp $(DEFINES) $(ARCH) \
		   -mthumb -mthumb-interwork $(INCLUDEFLAGS) \
		   -ffunction-sections -fdata-sections

CFLAGS		+= -std=gnu11 $(WARNFLAGS) $(DEFINES) $(ARCH) \
		   -mthumb -mthumb-interwork $(INCLUDEFLAGS) -O2 \
		   -ffunction-sections -fdata-sections \
		   -fomit-frame-pointer

LDFLAGS		:= -mthumb -mthumb-interwork $(LIBDIRSFLAGS) \
		   -Wl,-Map,$(MAP) -Wl,--gc-sections -nostdlib \
		   -T$(BLOCKSDS)/sys/crts/ds_arm7.ld \
		   -Wl,--no-warn-rwx-segments \
		   -Wl,--start-group $(LIBS) -lgcc -Wl,--end-group


# Intermediate build files
# ------------------------
OBJS		:= $(addprefix $(BUILDDIR)/, $(notdir $(C_FILES:%.c=%.o) $(S_FILES:%.s=%.o)))
DEPS		:= $(OBJS:.o=.d)
export VPATH	:= $(SOURCEDIRS)

# Targets
# -------
.PHONY: all clean

all: $(BUILDDIR) $(ELF)

$(BUILDDIR):
	mkdir -p $(BUILDDIR)

$(ELF): $(OBJS)
	$(LD) -o $@ $(OBJS) $(BLOCKSDS)/sys/crts/ds_arm7_crt0.o $(LDFLAGS)
clean:
	rm $(ELF) $(MAP) $(OBJS)

# Rules
# -----
$(BUILDDIR)/%.o : %.s
	$(CC) $(ASFLAGS) -MMD -MP -c -o $@ $<

$(BUILDDIR)/%.o : %.c
	$(CC) $(CFLAGS) -MMD -MP -c -o $@ $<

# Include dependency files if they exist
# --------------------------------------

-include $(DEPS)