makefile

# Directories
SRC_DIR = src
OBJ_DIR = obj
RELEASE_DIR = release
DEBUG_DIR = debug

# Compiler and flags
CXX = g++
# Base flags
BASE_CXXFLAGS = -std=c++14 -Wall -Iinclude -Ithird_party

# Debug flags - include debug info, minimal optimization
DEBUG_CXXFLAGS = $(BASE_CXXFLAGS) -g -O1

# Release flags - full optimization, no debug info
RELEASE_CXXFLAGS = $(BASE_CXXFLAGS) -O3 -DNDEBUG

# Current mode - can be overridden by 'make MODE=release'
MODE ?= debug

# Set flags based on mode
ifeq ($(MODE),debug)
    CXXFLAGS = $(DEBUG_CXXFLAGS)
    TARGET_DIR = $(DEBUG_DIR)
else
    CXXFLAGS = $(RELEASE_CXXFLAGS)
    TARGET_DIR = $(RELEASE_DIR)
endif

FRAMEWORKS = -framework ApplicationServices

# Find all .cpp files recursively in SRC_DIR
SRCS := $(shell find $(SRC_DIR) -name '*.cpp')
# Generate object file names in OBJ_DIR, using the base name of the source file
# Assumes no two .cpp files have the same name in different subdirectories
OBJS := $(patsubst %.cpp,$(OBJ_DIR)/%.o,$(notdir $(SRCS)))

# Target executable
TARGET = $(TARGET_DIR)/input_simulator

# Tell make where to find source files for the pattern rule below
VPATH := $(shell find $(SRC_DIR) -type d)

# Default target
all: directories $(TARGET)

# Create necessary directories
directories:
	mkdir -p $(OBJ_DIR)
	mkdir -p $(RELEASE_DIR)
	mkdir -p $(DEBUG_DIR)

# Link
$(TARGET): $(OBJS)
	$(CXX) $(CXXFLAGS) $(OBJS) -o $(TARGET) $(FRAMEWORKS)

# Compile source files found via VPATH into OBJ_DIR
$(OBJ_DIR)/%.o: %.cpp
	$(CXX) $(CXXFLAGS) -c $< -o $@

# Clean
clean:
	rm -rf $(OBJ_DIR)
	rm -f $(DEBUG_DIR)/*
	rm -f $(RELEASE_DIR)/*

# Targets for specific modes
debug: all

release:
	$(MAKE) MODE=release all

.PHONY: all clean directories debug release