BUILD := build

override PACKAGES := fmt

WARNINGS := -Wall -Werror
OPTIMIZE := -Og -flto
DEBUG := -g

CXX := g++
CXXFLAGS := $(WARNINGS) $(OPTIMIZE) $(DEBUG)

LD := ld

PALBART := palbart

override CXXFLAGS += -std=c++20

override COMPILE_FLAGS := -MMD -MP -I. -Inanosim
override LINK_FLAGS :=

ifneq "$(strip $(PACKAGES))" ""
  override COMPILE_FLAGS += $(shell pkg-config --cflags $(PACKAGES))
  override LINK_FLAGS += -Wl,--start-group $(shell pkg-config --libs $(PACKAGES)) -Wl,--end-group
endif

default: $(BUILD)/minigolf
.PHONY: default

clean:
	rm -rf $(BUILD)
.PHONY: clean

.SECONDARY:
.SUFFIXES:

.have_submodules:
	git submodule update --init --recursive
	@touch $@

-include .have_submodules

override SOURCES := $(shell find -\( -name build -prune -\) -o -\( -\( -name \*.bin -o -name \*.cpp -o -name \*.pal -\) -print -\))

override OBJECTS := $(addprefix $(BUILD)/, $(addsuffix .o, $(basename $(SOURCES))))
override DEPENDS := $(addprefix $(BUILD)/, $(addsuffix .d, $(basename $(SOURCES))))

override SOURCES += $(BUILD)/programs/programs.cpp
override OBJECTS += $(BUILD)/programs/programs.o
override DEPENDS += $(BUILD)/programs/programs.d $(BUILD)/programs/programs.cpp.d

$(BUILD)/programs/programs.cpp.d:
	@mkdir -p $(dir $@)
	@echo "build/programs/programs.cpp:" `ls -1 programs/*` > $@
.PHONY: $(BUILD)/programs/programs.cpp.d

-include $(DEPENDS)

$(BUILD)/%.bin: %.bin
	@mkdir -p $(dir $@)
	ln -ft $(dir $@) $<

$(BUILD)/%.bin: %.pal
	@mkdir -p $(dir $@)
	ln -ft $(dir $@) $<
	$(PALBART) -$$ -a -n $(basename $@).pal

$(BUILD)/%.o: $(BUILD)/%.bin
	cd $(dir $@) && $(LD) -r -b binary -z noexecstack -o $(notdir $@) $(notdir $<)

$(BUILD)/%.o: %.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) $(COMPILE_FLAGS) -c -o $@ $<

$(BUILD)/%.o: $(BUILD)/%.cpp
	$(CXX) $(CXXFLAGS) $(COMPILE_FLAGS) -c -o $@ $<

$(BUILD)/programs/programs.cpp:
	@mkdir -p $(dir $@)
	scripts/mkprograms > $@

$(BUILD)/minigolf: $(OBJECTS)
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) -o $@ -Wl,--start-group $+ -Wl,--end-group $(LINK_FLAGS)