C/C++ Makefile template

Makefile

# Get top dir
# https://github.com/imp/dnsmasq/blob/master/Makefile
TOP_DIR != pwd
TOP_DIR ?= $(CURDIR)

BIN_DIR := $(TOP_DIR)/bin
TARGET := $(BIN_DIR)/SimulateServer

OBJ_DIR := $(TOP_DIR)/obj
OBJECTS := $(patsubst %.cpp, %.o, $(wildcard *.cpp))
OBJECTS := $(addprefix $(OBJ_DIR)/, $(OBJECTS))

# Run 'make BUILD_DEBUG=1' to generate gdb debug symbols
ifndef BUILD_DEBUG
override BUILD_DEBUG = 0
endif

ifneq ($(BUILD_DEBUG), 0)
$(info Debug build)
EXTRA_CPPFLAGS := -Wall -W -g
else
$(info Release build)
EXTRA_CPPFLAGS := -Wall -W -O2
endif

all: $(TARGET)

$(TARGET): $(OBJECTS) | $(BIN_DIR)
	$(CXX) $(LDFLAGS) $^ -o $(TARGET)

$(OBJECTS): $(OBJ_DIR)/%.o: %.cpp | $(OBJ_DIR)
	$(CXX) $(CXXFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS) -c $< -o $@

$(BIN_DIR):
	@mkdir -p $@

$(OBJ_DIR):
	@mkdir -p $@

.PHONY: clean rebuild
clean:
	rm -rf $(BIN_DIR) $(OBJ_DIR)

rebuild:
	$(MAKE) clean
	$(MAKE) all