顶层Makefile分析

Posted 2021-08-13 四季帆

1. 顶层目录下的Makefile

        OpenHarmony/kernel/liteos_a/Makefile

-include $(LITEOSTOPDIR)/tools/build/config.mk               #包含 kernel/liteos_a/tools/build/config.mk

LITEOS_TARGET = liteos
LITEOS_PLATFORM_BASE = $(LITEOSTOPDIR)/platform

all: $(OUT) $(BUILD) $(LITEOS_TARGET) $(APPS)                #顶层目录下Makefile中的第一个目标

#文件很长，所以删掉了很多内容，只留下了要分析内容的主干
$(OUT): $(LITEOS_MENUCONFIG_H)
	$(HIDE)mkdir -p $(OUT)/lib		    #创建目录$(OUT)/lib
	$(HIDE)$(CC) -I$(LITEOS_PLATFORM_BASE)/include -I$(LITEOSTOPDIR)/../../vendor/hisi/hi35xx/$(LITEOS_PLATFORM)/config/board \\
		-E $(LITEOS_PLATFORM_BASE)/board.ld.S \\
		-o $(LITEOS_PLATFORM_BASE)/board.ld -P         #将kernel/liteos_a/platform/board.ld.S编译成board.ld
		
$(BUILD):
	$(HIDE)mkdir -p $(BUILD)         #创建目录$(BUILD)
	
$(LITEOS_TARGET): $(__LIBS)
	$(HIDE)touch $(LOSCFG_ENTRY_SRC)

	$(HIDE)for dir in $(LITEOS_SUBDIRS); \\        #遍历目录LITEOS_SUBDIRS
	do $(MAKE) -C $$dir all || exit 1; \\          #进入目录并编译目录中Makefile的第一个目标all
	done

	#连接各种库和目标文件
	$(LD) $(LITEOS_LDFLAGS) $(LITEOS_TABLES_LDFLAGS) $(LITEOS_DYNLDFLAGS) -Map=$(OUT)/$@.map -o $(OUT)/$@ --start-group $(LITEOS_LIBDEP) --end-group
#	$(SIZE) -t --common $(OUT)/lib/*.a >$(OUT)/$@.objsize
	$(OBJCOPY) -O binary $(OUT)/$@ $(LITEOS_TARGET_DIR)/$@.bin    #生成bin文件
	$(OBJDUMP) -t $(OUT)/$@ |sort >$(OUT)/$@.sym.sorted
	$(OBJDUMP) -d $(OUT)/$@ >$(OUT)/$@.asm                  #反汇编生成汇编文件
#	$(NM) -S --size-sort $(OUT)/$@ >$(OUT)/$@.size

$(ROOTFS): $(ROOTFSDIR)
	$(HIDE)$(shell $(LITEOSTOPDIR)/tools/scripts/make_rootfs/rootfsimg.sh $(ROOTFS_DIR) $(FSTYPE)  ${ROOTFS_SIZE})
	$(HIDE)cd $(ROOTFS_DIR)/.. && zip -r $(ROOTFS_ZIP) $(ROOTFS)
ifneq ($(OUT), $(LITEOS_TARGET_DIR))
	$(HIDE)mv $(ROOTFS_DIR) $(LITEOS_TARGET_DIR)rootfs
endif

1.1 kernel/liteos_a/tools/build/config.mk

-include $(LITEOSTOPDIR)/tools/build/mk/los_config.mk   #即kernel/liteos_a/tools/build/mk/los_config.mk

TOP_LD_PATH      = $(LITEOSTOPDIR)
SCRIPTS_PATH     = $(LITEOS_SCRIPTPATH)
LITEOS_MK_PATH   = $(MK_PATH)
LITEOS_SUBDIRS   = $(LIB_SUBDIRS)
LIB_BIGODIR      = $(LITEOS_LIB_BIGODIR)

##### liteos tables -u ldflags #####
-include $(LITEOS_MK_PATH)/liteos_tables_ldflags.mk

LITEOS_COPTS   := $(LITEOS_COPTS_DEBUG) $(LITEOS_COPTS_BASE)  \\
                  $(LITEOS_COPTS_EXTRA) $(LITEOS_CORE_COPTS)
LITEOS_CXXOPTS  := $(LITEOS_CXXOPTS_BASE)
LITEOS_INCLUDE  := $(LITEOS_KERNEL_INCLUDE)  $(LITEOS_EXTKERNEL_INCLUDE) \\
                   $(LITEOS_COMPAT_INCLUDE)  $(LITEOS_FS_INCLUDE) \\
                   $(LITEOS_NET_INCLUDE)     $(LITEOS_LIB_INCLUDE) \\
                   $(LITEOS_DRIVERS_INCLUDE) $(LOSCFG_TOOLS_DEBUG_INCLUDE) \\
                   $(LITEOS_PLATFORM_INCLUDE)
LITEOS_LIBDEP   := $(LITEOS_BASELIB)
LITEOS_ASFLAGS  := $(LITEOS_ASOPTS)      $(LITEOS_INCLUDE)
LITEOS_CFLAGS   := $(LITEOS_COPTS)       $(LITEOS_CMACRO) \\
                   $(LITEOS_CMACRO_TEST) $(LITEOS_IMAGE_MACRO) \\
                   $(LITEOS_INCLUDE)
LITEOS_CXXFLAGS := $(LITEOS_CXXOPTS)     $(LITEOS_CXXMACRO) \\
                   $(LITEOS_CMACRO)      $(LITEOS_CXXINCLUDE)
LITEOS_LDFLAGS  := $(LITEOS_LD_OPTS)     $(LITEOS_LD_PATH) \\
                   $(LITEOS_LD_SCRIPT)

1.2 kernel/liteos_a/tools/build/mk/los_config.mk

-include $(LITEOSTOPDIR)/.config
ifeq ($(LOSCFG_3RDPARTY), y)
    -include $(LITEOSTOPDIR)/3rdParty/3rdParty.mk
endif
include $(LITEOSTOPDIR)/arch/cpu.mk
include $(LITEOSTOPDIR)/platform/bsp.mk
ifeq ($(LOSCFG_DRIVERS_HDF), y)
include $(LITEOSTOPDIR)/../../drivers/hdf/lite/hdf_lite.mk
endif

2. 总结

        顶层目录下的主Makefile是LITEOS_SUBDIRS变量来控制是否编译相关子模块的，比如文件系统fat是否编译进kernel，在los_config.mk的296行向LITEOS_SUBDIRS追加了fs/fat，说明只要满足控制宏就回将fat编译进kernel。

config.mk:36:LITEOS_SUBDIRS   = $(LIB_SUBDIRS)

tools/build/mk/los_config.mk:97:LIB_SUBDIRS :=
tools/build/mk/los_config.mk:157:    LIB_SUBDIRS     += $(LITEOSTOPDIR)/kernel/common
tools/build/mk/los_config.mk:163:LIB_SUBDIRS       += kernel/base
tools/build/mk/los_config.mk:167:LIB_SUBDIRS += $(LITEOSTOPDIR)/../../vendor/hisi/hi35xx/$(LITEOS_PLATFORM)/config/board/
tools/build/mk/los_config.mk:214:    LIB_SUBDIRS           += kernel/extended/pipe
tools/build/mk/los_config.mk:221:    LIB_SUBDIRS        += lib/libc
tools/build/mk/los_config.mk:222:    LIB_SUBDIRS        += lib/libsec
tools/build/mk/los_config.mk:235:    LIB_SUBDIRS         += lib/libscrew
tools/build/mk/los_config.mk:246:    LIB_SUBDIRS       += kernel/extended/cppsupport
tools/build/mk/los_config.mk:252:    LIB_SUBDIRS    += lib/zlib
tools/build/mk/los_config.mk:260:    LIB_SUBDIRS       += compat/posix
tools/build/mk/los_config.mk:267:    LIB_SUBDIRS    += bsd
······
tools/build/mk/los_config.mk:296:    LIB_SUBDIRS     += fs/fat
······
tools/build/mk/los_config.mk:474:    LIB_SUBDIRS       += shell
tools/build/mk/los_config.mk:481:    LIB_SUBDIRS       += net/telnet
tools/build/mk/los_config.mk:495:LIB_SUBDIRS += syscall
tools/build/mk/los_config.mk:496:LIB_SUBDIRS += kernel/user
tools/build/mk/los_config.mk:515:LIB_SUBDIRS += security