Makefile

# Assets are loaded relative to SDL_GetBasePath(), i.e. the directory of the
# executable, so the asset directories are symlinked next to the binary.
# Everything in build/ is generated, so it can be deleted at any time.

SRC_DIR := Rpg-SDL
BUILD_DIR := build
TARGET := $(BUILD_DIR)/rpg-sdl

SOURCES := $(wildcard $(SRC_DIR)/*.cpp)
OBJECTS := $(patsubst $(SRC_DIR)/%.cpp,$(BUILD_DIR)/%.o,$(SOURCES))
DEPS := $(OBJECTS:.o=.d)
ASSETS := fonts graphics music map
ASSET_LINKS := $(addprefix $(BUILD_DIR)/,$(ASSETS))

SDL_LIBS := sdl2 SDL2_image SDL2_ttf SDL2_mixer

CXX ?= g++
# -MMD -MP writes the .d files that rebuild an object when a header it includes changes
CXXFLAGS += -std=c++14 -O2 -Wall -MMD -MP $(shell pkg-config --cflags $(SDL_LIBS))
LDLIBS += $(shell pkg-config --libs $(SDL_LIBS))

all: $(TARGET) $(ASSET_LINKS)

$(TARGET): $(OBJECTS)
	$(CXX) $(OBJECTS) $(LDLIBS) -o $@

$(BUILD_DIR)/%.o: $(SRC_DIR)/%.cpp | $(BUILD_DIR)
	$(CXX) $(CXXFLAGS) -c $< -o $@

$(ASSET_LINKS): $(BUILD_DIR)/%: $(SRC_DIR)/% | $(BUILD_DIR)
	ln -sfn ../$(SRC_DIR)/$* $@

$(BUILD_DIR):
	mkdir -p $@

run: all
	./$(TARGET)

clean:
	rm -rf $(BUILD_DIR)

-include $(DEPS)

.PHONY: all run clean