# 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	:= src
INCLUDEDIRS     :=
DSIWIFI		:= third_party/dsiwifi

ifdef BUILD_DSI
SOURCEDIRS	+= $(DSIWIFI)/arm_host/source $(DSIWIFI)/common/source $(DSIWIFI)/arm_host/source/nds $(DSIWIFI)/arm_host/source/lwip $(DSIWIFI)/arm_host/source/lwip/ipv4 $(DSIWIFI)/arm_host/source/lwip/ipv6 $(DSIWIFI)/arm_host/source/lwip/netif $(DSIWIFI)/arm_host/source/lwip/netif/ppp $(DSIWIFI)/arm_host/source/lwip/api
INCLUDEDIRS	+= $(DSIWIFI)/arm_host/include $(DSIWIFI)/common/source $(DSIWIFI)/include $(DSIWIFI)/include/lwip
BUILDDIR	:= build-dsi
DEFINES		:= -DPLAT_NDS -DBUILD_DSI
LIBS		:= -lnds9 -lc
LIBDIRS		:= $(BLOCKSDS)/libs/libnds
else
BUILDDIR	:= build-nds
DEFINES		:= -DPLAT_NDS
LIBS		:= -ldswifi9 -lnds9 -lc
LIBDIRS		:= $(BLOCKSDS)/libs/dswifi $(BLOCKSDS)/libs/libnds
endif

NAME		:= cc-arm9
ELF		:= $(BUILDDIR)/$(NAME).elf
MAP		:= $(BUILDDIR)/$(NAME).map

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

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

# Compiler and linker flags
# -------------------------

ARCH		:= -mthumb -mcpu=arm946e-s+nofp

SPECS		:= $(BLOCKSDS)/sys/crts/ds_arm9.specs

WARNFLAGS	:= -Wall

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) $(INCLUDEFLAGS) \
		   $(ARCH) -ffunction-sections -fdata-sections \
		   -specs=$(SPECS)

CFLAGS		+= -std=gnu17 $(WARNFLAGS) $(DEFINES) $(INCLUDEFLAGS) \
		   $(ARCH) -O2 -ffunction-sections -fdata-sections \
		   -specs=$(SPECS)

LDFLAGS		:= $(ARCH) $(LIBDIRSFLAGS) -Wl,-Map,$(MAP) $(DEFINES) \
		   -Wl,--start-group $(LIBS) -Wl,--end-group -specs=$(SPECS)

# 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

all: $(BUILDDIR) $(ELF)

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

$(ELF): $(OBJS)
	$(LD) -o $@ $(OBJS) $(LDFLAGS)

clean:
	rm $(ELF) $(MAP) $(OBJS)
	rm -rf $(BUILDDIR)

# Rules
# -----

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

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

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

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

-include $(DEPS)