Makefile

AS := ca65
LD := ld65

export TOP_DIR := $(dir $(realpath $(lastword $(MAKEFILE_LIST))))
export BIN_DIR := $(TOP_DIR)/bin
export BUILD_DIR := $(TOP_DIR)/build
export CONF_DIR := $(TOP_DIR)/conf
export DATA_DIR := $(TOP_DIR)/data
export INC_DIR := $(TOP_DIR)/include
export BINC_DIR := $(TOP_DIR)/binclude
export SRC_DIR := $(TOP_DIR)/src
export TOOLS_DIR := $(TOP_DIR)/tools

SRC_SUB_DIRS := $(wildcard $(SRC_DIR)/*/)
BUILD_SUB_DIRS := $(SRC_SUB_DIRS:$(SRC_DIR)/%=$(BUILD_DIR)/%)

LD_CONF := $(CONF_DIR)/ld.cfg
LD_SMALL_CONF := $(CONF_DIR)/ld_small.cfg

SRCS := $(wildcard $(SRC_DIR)/*.s) $(wildcard $(addsuffix /*.s, $(SRC_SUB_DIRS)))
OBJS := $(SRCS:$(SRC_DIR)/%.s=$(BUILD_DIR)/%.o)
INCS := $(wildcard $(INC_DIR)/*.inc)
BINCS := $(wildcard $(BINC_DIR)/*)

NAME := nes86
ROM := $(BIN_DIR)/$(NAME).nes
DBG := $(ROM:%.nes=%.dbg)

MAJOR_VERSION := 0
MINOR_VERSION := 8

# TODO: use "--feature line_continuations" and remove ".linecont +" from source files.
#       at the moment, the cc65 package provided for my Linux distro doesn't support that.
AS_FLAGS := -I $(INC_DIR)
AS_FLAGS += --bin-include-dir $(BINC_DIR)
AS_FLAGS += --feature string_escapes
AS_FLAGS += --feature underline_in_numbers
AS_FLAGS += -D MAJOR_VERSION=$(MAJOR_VERSION)
AS_FLAGS += -D MINOR_VERSION=$(MINOR_VERSION)
AS_FLAGS += --debug-info
ksnes: AS_FLAGS += -D KS_NES
edfc: AS_FLAGS += -D EDFC

LD_FLAGS := --dbgfile $(DBG)
all: LD_FLAGS += -C $(LD_CONF)
ksnes: LD_FLAGS += -C $(LD_SMALL_CONF)
edfc: LD_FLAGS += -C $(LD_SMALL_CONF)

.PHONY: all
all: $(DATA_DIR) $(ROM)

# build for the ksNes emulator in Animal Crossing
.PHONY: ksnes
ksnes: $(DATA_DIR) $(ROM)

# build for the original Everdrive N8
.PHONY: edfc
edfc: $(DATA_DIR) $(ROM)

.PHONY: clean
clean:
	$(MAKE) -C $(DATA_DIR) clean
	-rm -rf $(BINC_DIR)
	-rm -rf $(BUILD_DIR)
	-rm -rf $(BIN_DIR)

.PHONY: $(DATA_DIR)
$(DATA_DIR): $(BINC_DIR)
	$(MAKE) -C $(DATA_DIR)

# link object and library files into a iNES file
$(ROM): $(OBJS) $(LD_CONF) $(BIN_DIR)
	$(LD) $(LD_FLAGS) -o $@ $(OBJS)

# assemble source files into objects
$(BUILD_DIR)/%.o: $(SRC_DIR)/%.s $(INCS) $(BINCS) $(BINC_DIR) $(BUILD_DIR)
	$(AS) $(AS_FLAGS) -o $@ $<
	-python $(TOOLS_DIR)/lint65.py $(LD_CONF) $<

$(BUILD_DIR):
	-mkdir $@
	-mkdir $(BUILD_SUB_DIRS)

$(BIN_DIR):
	-mkdir $@

$(BINC_DIR):
	-mkdir $@