# 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     :=
DEFINES         := -DPLAT_NDS
LIBS            := -ldswifi9 -lnds9 -lc
LIBDIRS         := $(BLOCKSDS)/libs/dswifi $(BLOCKSDS)/libs/libnds

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

# Tools
# -----

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

# Source files
# ------------

SOURCES_S	:= $(foreach dir,$(SOURCEDIRS),$(wildcard $(dir)/*.s))
SOURCES_C	:= $(foreach dir,$(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	:= $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_S))) \
		   $(addsuffix .o,$(addprefix $(BUILDDIR)/,$(SOURCES_C)))

DEPS		:= $(OBJS:.o=.d)

# Targets
# -------

.PHONY: all

all: $(ELF)

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

# Rules
# -----

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

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

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

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

-include $(DEPS)