Makefile

# Compiler
CXX = clang++
CXXFLAGS = -std=c++17 -g -DGL_SILENCE_DEPRECATION

# Include paths
INCLUDE_PATHS = -Isrc \
                -Ibuild/external/ggpo/include \
                $(shell pkg-config --cflags sdl2 sdl2_image SDL2_ttf jsoncpp) \
                -Iimgui -Iimgui/impl

# Library paths and linker flags
LIBRARY_FLAGS = $(shell pkg-config --libs sdl2 sdl2_image SDL2_ttf jsoncpp)
FRAMEWORK_FLAGS = -framework OpenGL

# Output binary
OBJ_NAME = game

# Build directory for object files
BUILD_DIR = build/obj

# Precompiled header
PCH_SRC = src/pch.h
PCH_OUT = $(BUILD_DIR)/pch.h.pch

# Source files
SRC_FILES = $(shell find src -name '*.cpp')
IMGUI_FILES = imgui/imgui.cpp imgui/imgui_draw.cpp imgui/imgui_widgets.cpp \
              imgui/impl/imgui_impl_sdl.cpp imgui/impl/imgui_impl_opengl2.cpp

# Object files: src/Foo/Bar.cpp -> build/obj/src/Foo/Bar.o
SRC_OBJS = $(patsubst %.cpp,$(BUILD_DIR)/%.o,$(SRC_FILES))
IMGUI_OBJS = $(patsubst %.cpp,$(BUILD_DIR)/%.o,$(IMGUI_FILES))
ALL_OBJS = $(SRC_OBJS) $(IMGUI_OBJS)

# Dependency files generated by -MMD
DEP_FILES = $(ALL_OBJS:.o=.d)

# Default target
all: $(OBJ_NAME)

# Link
$(OBJ_NAME): $(ALL_OBJS)
	$(CXX) $(ALL_OBJS) $(LIBRARY_FLAGS) $(FRAMEWORK_FLAGS) -o $(OBJ_NAME)

# Compile PCH
$(PCH_OUT): $(PCH_SRC)
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) $(INCLUDE_PATHS) -x c++-header $< -o $@

# Compile project sources (with PCH)
$(BUILD_DIR)/src/%.o: src/%.cpp $(PCH_OUT)
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) $(INCLUDE_PATHS) -MMD -MP -include-pch $(PCH_OUT) -c $< -o $@

# Compile imgui sources (no PCH — they don't use our project headers)
$(BUILD_DIR)/imgui/%.o: imgui/%.cpp
	@mkdir -p $(dir $@)
	$(CXX) $(CXXFLAGS) $(INCLUDE_PATHS) -MMD -MP -c $< -o $@

clean:
	rm -rf $(BUILD_DIR) $(OBJ_NAME)

.PHONY: all clean

# Include generated dependency files (if they exist)
-include $(DEP_FILES)