# 该Makefile应当通过build_project.sh脚本执行
VERSION = 1.0

# arm -> linux arm rk3188 
# x86 -> window x86 mingw32 dll
# x64 -> linux x64
# aarch64 ->aarch64-linux-

TARGET_ARCH = arm 
CROSS_COMPILE = arm-linux-gnueabihf-
RELEASE=0

AS = $(CROSS_COMPILE)as
CC = $(CROSS_COMPILE)gcc
CXX = $(CROSS_COMPILE)g++
LD = $(CROSS_COMPILE)ld
AR = $(CROSS_COMPILE)ar
STRIP = $(CROSS_COMPILE)strip
OBJCOPY = $(CROSS_COMPILE)objcopy
CP = cp

ifeq ($(RELEASE), 1)
    DEBUG = -Wall -O2 
else
    DEBUG = -g -Wall
endif

CONFIG_COMPILER = gnu

TOP_DIR := $(shell pwd)

# 最终可执行文件名，是当前项目的目录名。
TARGET_EXEC := \
	$(notdir $(patsubst %/,%,$(dir $(lastword $(abspath $(MAKEFILE_LIST))))))

# tensorflow源码的最外层目录，以及其依赖的第三方库目录
TF_DIR := ./tensorflow_src
TF_DEPENDENCY_DIR := $(TF_DIR)/tensorflow/lite/tools/make/downloads
RKNN_DIR := ./librknn_api

# 生成好的项目所在目录，项目obj和可执行文件所在目录
BUILD_DIR := $(TOP_DIR)/bin
OBJ_DIR := $(TOP_DIR)/bin
BIN_DIR := $(TOP_DIR)/bin

# 项目源文件、头文件和库文件所在目录
SRC_DIRS := $(TOP_DIR)/src \
		$(TOP_DIR)/mfcc
	

INC_DIRS := $(TOP_DIR)/include \
	$(TF_DIR) \
	$(TF_DEPENDENCY_DIR)/flatbuffers/include \
	$(TF_DEPENDENCY_DIR)/absl \
	$(TF_DEPENDENCY_DIR)/googletest/googlemock/include \
	$(TF_DEPENDENCY_DIR)/googletest/googletest/include \
	$(RKNN_DIR)/include

LIB_DIRS := ./lib \
		$(RKNN_DIR)/lib \
		./libtensorflow/arm/lib 

# 符合要求的源文件
SRCS += $(foreach src_dir,$(SRC_DIRS),$(wildcard $(src_dir)/*.cpp))
SRCS += $(foreach src_dir,$(SRC_DIRS),$(wildcard $(src_dir)/*.cc))
SRCS += $(foreach src_dir,$(SRC_DIRS),$(wildcard $(src_dir)/*.c))


# 用于处理多个源目录的情况
vpath %*.cpp %(SRC_DIRS)
vpath %*.cc %(SRC_DIRS)
vpath %*.c %(SRC_DIRS)

# 第三方路径
VPATH = ./mfcc:./src:./fft2d

# 需要的链接库
LIBS := -lpthread \
	-latomic \
	-lrt \
	-ldl \
	-lrknn_api

# obj文件的文件名及存放路径
#OBJS := $(($(notdir $SRCS):%=$(OBJ_DIR)/%.o)
OBJS := $(foreach file,$(SRCS),$(OBJ_DIR)/$(notdir $(file).o))

# 额外目录指定文件编译
OBJS_EXT := fftsg2d.c fftsg.c 

OBJS += $(OBJS_EXT:%=$(OBJ_DIR)/%.o)


# =========================================================

DEFINES := #-D DLL

# 为编译器指定要包含的头文件目录
CPPFLAGS := $(addprefix -I,$(INC_DIRS))

# 为C++编译器指定预编译参数
#CXXFLAGS += \
	-march=armv6 \
	-mfpu=vfp \
	-funsafe-math-optimizations \
	-ftree-vectorize \
	-fPIC \
	-marm

# 为C编译器指定预编译参数
#CFLAGS += \
	-march=armv6 \
	-mfpu=vfp \
	-funsafe-math-optimizations \
	-ftree-vectorize \
	-fPIC \
	-marm

# 指定链接库和参数
#LDFLAGS := \
	$(addprefix -L,$(LIB_DIRS)) \
	$(LIBS) \
	-Wl,--no-export-dynamic \
	-Wl,--exclude-libs,ALL \
	-Wl,--gc-sections \
	-Wl,--as-needed

LDFLAGS := \
	$(addprefix -L,$(LIB_DIRS)) \
	$(LIBS) 

# 汇编参数
AFLAGS :=

ifeq ($(TARGET_ARCH), arm)
CFLAGS +=
CXXFLAGS +=
else ifeq ($(TARGET_ARCH), x86)
CFLAGS +=
CXXFLAGS +=
else ifeq ($(TARGET_ARCH), x64)
CFLAGS +=
CXXFLAGS +=
endif


# =========================================================

# 链接所有obj文件

$(BIN_DIR)/$(TARGET_EXEC): $(OBJS) 
	$(CXX) $(OBJS) -o $@ $(LDFLAGS)
	@echo "Version $(VERSION)"
	@echo "Build $(TARGET_EXEC) program OK"

# 编译所有c源文件
$(OBJ_DIR)/%.c.o: %.c 
	$(CC) $(DEBUG) $(CPPFLAGS) $(CFLAGS) $(DEFINES) -c $< -o $@

# 编译所有cpp源文件
$(OBJ_DIR)/%.cpp.o: %.cpp
	$(CXX) $(DEBUG) $(CPPFLAGS) $(CXXFLAGS) $(DEFINES) -c $< -o $@

# 编译所有cc源文件
$(OBJ_DIR)/%.cc.o: %.cc
	$(CXX) $(DEBUG) $(CPPFLAGS) $(CXXFLAGS) $(DEFINES) -c $< -o $@

# =========================================================

# 清空项目生成目录
.PHONY: clean
clean:
	rm -rf $(BUILD_DIR)/*

install:
	@echo "install $(TARGET_EXEC)"

#lib:$(lib_obj)
#	@echo "build  only dll $(lib_obj)"

#$(lib_obj):$(main_obj) $(cpp_obj) $(c_obj)
#	$(CXX) $(DEBUG) -shared -o $(out_dir)/$(lib_obj) $(main_obj) $(cpp_obj) $(CXXFLAGS) $(DLL) -Wl,--kill-at,--out-implib,$(out_dir)/$(lib_obj) $(DEFINES)
#	@echo "Version $(VERSION)"