BUILD := build

override PACKAGES := fmt

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

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

LD := ld

XXD := xxd

override CXXFLAGS += -std=c++20

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

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

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

-include $(DEPENDS)

$(BUILD)/%.bin: %.hex
	@mkdir -p $(dir $@)
	$(XXD) -r -p $< $@

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

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

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

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