Makefile

rwildcard = $(foreach d, $(wildcard $1*), $(filter $(subst *, %, $2), $d) $(call rwildcard, $d/, $2))

# This should be set externally
name ?= Cakes.dat
filepath ?=
dir_out ?= .

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

CC := $(DEVKITARM)/bin/arm-none-eabi-gcc
AS := $(DEVKITARM)/bin/arm-none-eabi-as
LD := $(DEVKITARM)/bin/arm-none-eabi-ld
OC := $(DEVKITARM)/bin/arm-none-eabi-objcopy

dir_source := source
dir_build := build
dir_rop3ds := rop3ds

ARM9FLAGS := -mcpu=arm946e-s -march=armv5te
ARM11FLAGS := -mcpu=mpcore
ASFLAGS := -mlittle-endian
LDFLAGS := -nostdlib -flto -fwhole-program -fno-builtin
CFLAGS := $(ASFLAGS) $(LDFLAGS) -marm -O2 -std=c11 -MMD -MP -Wall -Wextra -Wno-main -DLAUNCHER_PATH='"$(filepath)$(name)"'

get_objects = $(patsubst $(dir_source)/%.s, $(dir_build)/%.o, \
			  $(patsubst $(dir_source)/%.c, $(dir_build)/%.o, $1))

objects := $(call get_objects, $(wildcard $(dir_source)/*.s $(dir_source)/*.c))

objects_payload := $(call get_objects, \
				   $(call rwildcard, $(dir_source)/payload, *.s *.c))

versions := mset_4x mset_4x_dg mset_4x_ndg mset_6x

rops := $(foreach ver, $(versions), $(dir_build)/$(ver)/rop.dat)

.SECONDARY:

.PHONY: all
all: launcher

.PHONY: launcher
launcher: $(dir_out)/$(name)

.PHONY: bigpayload
bigpayload: $(dir_build)/bigpayload.built

.PHONY: clean
clean:
	rm -rf $(dir_out)/$(name) $(dir_build)
	@$(MAKE) -C $(dir_rop3ds) clean

# Big payload
$(dir_build)/bigpayload.built: $(dir_out)/$(name) $(dir_build)/payload/main.bin
	dd if=$(dir_build)/payload/main.bin of=$(dir_out)/$(name) bs=512 seek=144
	@touch $@

# Throw everything together
$(dir_out)/$(name): $(dir_build)/mset/main.bin $(dir_build)/spider/main.bin
	@$(MAKE) -s -j1 $(rops)  # These can't be built in parallel...
	touch $@
	dd if=$(dir_build)/spider/main.bin of=$@ bs=512 seek=0
	dd if=$(dir_build)/mset_4x/rop.dat of=$@ bs=512 seek=32
	dd if=$(dir_build)/mset_4x_dg/rop.dat of=$@ bs=512 seek=34
	dd if=$(dir_build)/mset_4x_ndg/rop.dat of=$@ bs=512 seek=36
	dd if=$(dir_build)/mset_6x/rop.dat of=$@ bs=512 seek=40
	dd if=$(dir_build)/mset/main.bin of=$@ bs=512 seek=64

# MSET ROPs
$(dir_build)/mset_%/rop.dat: rop_param = MSET_$(shell echo $* | tr a-z A-Z)
$(dir_build)/mset_%/rop.dat:
	@make -C rop3ds LoadCodeMset.dat ASFLAGS="-D$(rop_param) -DARM_CODE_OFFSET=0x8000"
	@mkdir -p "$(@D)"
	@mv rop3ds/LoadCodeMset.dat $@

# Create bin from elf
$(dir_build)/%/main.bin: $(dir_build)/%/main.elf
	$(OC) -S -O binary $< $@

# Different flags for different things
$(dir_build)/payload/main.elf: ASFLAGS := $(ARM9FLAGS) $(ASFLAGS)
$(dir_build)/payload/main.elf: CFLAGS := $(ARM9FLAGS) $(CFLAGS)
$(dir_build)/payload/main.elf: $(objects_payload)
	$(LINK.o) -T linker_payload.ld $(OUTPUT_OPTION) $^

# The arm11 payloads
$(dir_build)/%/main.elf: ASFLAGS := $(ARM11FLAGS) $(ASFLAGS)

$(dir_build)/mset/main.elf: CFLAGS := -DENTRY_MSET $(ARM11FLAGS) $(CFLAGS)
$(dir_build)/mset/main.elf: $(patsubst $(dir_build)/%, $(dir_build)/mset/%, $(objects))
	$(LINK.o) -T linker_mset.ld $(OUTPUT_OPTION) $^

$(dir_build)/spider/main.elf: CFLAGS := -DENTRY_SPIDER $(ARM11FLAGS) $(CFLAGS)
$(dir_build)/spider/main.elf: $(patsubst $(dir_build)/%, $(dir_build)/spider/%, $(objects))
	$(LINK.o) -T linker_spider.ld $(OUTPUT_OPTION) $^

# Fatfs requires to be built in thumb
$(dir_build)/payload/fatfs/%.o: $(dir_source)/payload/fatfs/%.c
	@mkdir -p "$(@D)"
	$(COMPILE.c) -mthumb -mthumb-interwork -Wno-unused-function $(OUTPUT_OPTION) $<

$(dir_build)/payload/fatfs/%.o: $(dir_source)/payload/fatfs/%.s
	@mkdir -p "$(@D)"
	$(COMPILE.s) -mthumb -mthumb-interwork $(OUTPUT_OPTION) $<

$(dir_build)/payload/%.o: $(dir_source)/payload/%.c
	@mkdir -p "$(@D)"
	$(COMPILE.c) $(OUTPUT_OPTION) $<

$(dir_build)/payload/%.o: $(dir_source)/payload/%.s
	@mkdir -p "$(@D)"
	$(COMPILE.s) $(OUTPUT_OPTION) $<

.SECONDEXPANSION:
$(dir_build)/%.o: $(dir_source)/$$(notdir $$*).c
	@mkdir -p "$(@D)"
	$(COMPILE.c) $(OUTPUT_OPTION) $<

.SECONDEXPANSION:
$(dir_build)/%.o: $(dir_source)/$$(notdir $$*).s
	@mkdir -p "$(@D)"
	$(COMPILE.s) $(OUTPUT_OPTION) $<

include $(call rwildcard, $(dir_build), *.d)