#========================================================================================================
#                                            stc makefile
#FileName:    makefile
#Author:      xianfeng.du
#Data：        2022-08-10
#Description: top makefile
#========================================================================================================
VERSION = 1.00

OPTION ?= 
ifeq ($(OPTION),GCC)
	CROSS_CC ?=
else
#	TOOLS ?= /opt/gcc-linaro-7.5.0-2019.12-x86_64_aarch64-linux-gnu/bin
#	CROSS_CC ?= $(TOOLS)/aarch64-linux-gnu-
	CROSS_CC ?= aarch64-linux-gnu-
endif

AR = ar
CC = $(CROSS_CC)gcc
#$(info "CC=" $(CC))

git_id ?= $(shell git log -1 --format="%H")
commit_ts ?= $(shell git log -1 --format="%ct")
commit_time ?= $(shell date -d@$(commit_ts) +"%Y-%m-%d-%H:%M:%S")
#git_cmit ?= $(shell date +"%Y-%m-%d::%H:%M:%S")

$(info "commit_ts=" $(commit_ts))
$(info "commit_time=" $(commit_time))

DEFINES ?= TFU_VER=\"commit_id:$(git_id),commit_time:$(commit_time)\"
ifeq ($(adj_freq),yes)
DEFINES += SL_ADJ_FREQ
endif
board ?= EVMYFT
#ifeq ($(board),evb)
#DEFINES += EVB
#else
#DEFINES += EVMYFT
#endif
DEFINES += $(board)


#optimization level -O2
C_OPT_FLAGS ?= -O2

CC_FLAGS ?= $(C_OPT_FLAGS) -Wall -g 
CC_FLAGS += -Werror -Wno-unused-function 
CC_FLAGS += $(foreach d,$(DEFINES),-D$(d))
CC_FLAGS += -fPIC

SRC_DIRS ?= ./main/src
LIB_SRC_DIRS ?= ./stc/src
ifeq ($(gps),lc98s)
SRC_DIRS += ./lc98s/src
else
SRC_DIRS += ./ublox/src
endif

INCLUDE_DIRS ?= ./main/inc
INCLUDE_DIRS += ./stc/inc
INCLUDE_DIRS += ./ublox/inc

LD_FLAGS ?= -lgcc -lc 
LD_FLAGS += -lm -ldl -Wl,-rpath=./
LD_FLAGS += -lpthread
LD_FLAGS += -lstc
LD_FLAGS += -rdynamic -funwind-tables -ffunction-sections

$(info "DEFINES=" $(DEFINES))
#$(info "lib src =" $(LIB_SRC_DIRS))

#Flatten files and remove the duplicate by sort
ABS_SRC_DIRS := $(foreach d,$(SRC_DIRS),$(abspath $(d)))
#$(info "abs src =" $(ABS_SRC_DIRS))
ABS_LIB_SRC_DIRS := $(foreach d,$(LIB_SRC_DIRS),$(abspath $(d)))
#$(info "abs lib  =" $(ABS_LIB_SRC_DIRS))

SRC_FILES := $(foreach d,$(ABS_SRC_DIRS),$(wildcard $(d)/*.c))
#$(info "src files  =" $(SRC_FILES))
LIB_SRC_FILES := $(foreach d,$(ABS_LIB_SRC_DIRS),$(wildcard $(d)/*.c))
#$(info "lib files  =" $(LIB_SRC_FILES))
#main.c
MAIN_DIR := ./main/src
MAIN_FILE := ./main/src/main.c

# Allow certain files to be excluded from the build
#EXCL_SRCS ?= $(MAIN_FILE)

# Filter source files (allow files to be excluded)
FINAL_SRCS_FILES += $(foreach f,$(SRC_FILES),$(if $(findstring $(abspath $(f)),$(abspath $(EXCL_SRCS))),,$(f)))
#$(info "FINAL_SRCS_FILES=" $(FINAL_SRCS_FILES))

# ==============================================================================
# Variables: Output Files
# ==============================================================================
BUILD_DIR := ./build
LIB_DIRS ?= $(BUILD_DIR)
OBJ_MAIN_DIR   := $(BUILD_DIR)/main
OBJ_DIR   := $(BUILD_DIR)/obj
#BIN_DIR   := $(BUILD_DIR)/bin
#LIB_DIR   := $(BUILD_DIR)/lib
#ELF_FILE  := $(BIN_DIR)/test.elf
BIN_FILE := $(BUILD_DIR)/tfu.out
LIB_FILE := $(BUILD_DIR)/libstc.a

OBJ_FILES += $(foreach f,$(FINAL_SRCS_FILES),$(OBJ_DIR)/$(patsubst %.c,%.o,$(notdir $(f))))
#$(info "obj files  =" $(OBJ_FILES))
LIB_OBJ_FILES += $(foreach f,$(LIB_SRC_FILES),$(OBJ_DIR)/$(patsubst %.c,%.o,$(notdir $(f))))
#$(info "lib obj files  =" $(LIB_OBJ_FILES))
OBJ_MAIN_FILES += $(foreach f,$(MAIN_FILE),$(OBJ_MAIN_DIR)/$(patsubst %.c,%.o,$(notdir $(f))))



# ==============================================================================
# Rules: Compilation
# ==============================================================================
define DO_BUILD_OBJ
$(2)/%.o: $(1)/%.c | $(2)
	@echo "# Compiling $$< -> $$@"
	$(CC) $(CC_FLAGS) -o $$@ -c $$< $(patsubst %,-I %,$(INCLUDE_DIRS))
#OBJ_TGTS += $(foreach f,$(wildcard $(1)/*.c),$(OBJ_DIR)/$(notdir $(basename $(1)))/$(patsubst %.c,%.o,$(notdir $(f))))
endef

define DO_BUILD_DIR
$(1):
	@echo "# Creating directory $$@"
	mkdir -p $$@
endef

define DO_BUILD
	$(eval $(call DO_BUILD_DIR,$(1)))
	$(foreach d,$(sort $(2)),$(eval $(call DO_BUILD_OBJ,$(d),$(1))))
endef

$(eval $(call DO_BUILD,$(OBJ_DIR),$(ABS_SRC_DIRS)))
$(eval $(call DO_BUILD,$(OBJ_DIR),$(ABS_LIB_SRC_DIRS)))
$(eval $(call DO_BUILD,$(OBJ_MAIN_DIR), $(abspath $(MAIN_DIR))))

#$(BIN_FILE):$(OBJ_FILES) $(OBJ_MAIN_FILES)
$(BIN_FILE):$(OBJ_FILES)  
#	@echo "# Creating bin directory $(BIN_DIR)"
#	mkdir -p $(BIN_DIR)

	@echo "# Linking objects to form $@"
	$(CC) -o $@ $^ $(LD_FLAGS) $(patsubst %,-L %,$(LIB_DIRS))
#	$(CC) -o $@ $^ $(LD_FLAGS) -T$(LINK_FILE)	

$(LIB_FILE):$(LIB_OBJ_FILES) 
#	@echo "# Creating lib directory $(LIB_DIR)"
#	mkdir -p $(LIB_DIR)
	# $(info "lib obj =" $(LIB_OBJ_FILES))
	@echo "# Linking objects to form $@"
	$(AR) -rcs $@ $^ 	
#	$(CC) -shared -o $@ $^ $(LD_FLAGS)

# ==============================================================================
# Rules: Targets
# ==============================================================================
.DEFAULT_GOAL := all
.PHONY: build lib clean
all: lib build
build: $(BIN_FILE)
lib: $(LIB_FILE)
clean:
	@echo "deleted all files"
	rm -rf $(BUILD_DIR)