慢慢欣赏linux make menuconfig流程-白红宇

慢慢欣赏linux make menuconfig流程

阅读量：4070 次

发布时间：2019-05-25

本文共 7598 字，大约阅读时间需要 25 分钟。

先看一下打印（使用前需要make clean）

[root@cliffr linux-2.6.32]# lsarch   COPYING  crypto         drivers   fs       init  Kbuild  lib          Makefile  Module.symvers  README          samples  security  tools  virtblock  CREDITS  Documentation  firmware  include  ipc   kernel  MAINTAINERS  mm        net             REPORTING-BUGS  scripts  sound     usr[root@cliffr linux-2.6.32]# make menuconfig V=1make -f scripts/Makefile.build obj=scripts/basic  gcc -Wp,-MD,scripts/basic/.fixdep.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer     -o scripts/basic/fixdep scripts/basic/fixdep.c    gcc -Wp,-MD,scripts/basic/.docproc.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer     -o scripts/basic/docproc scripts/basic/docproc.c    gcc -Wp,-MD,scripts/basic/.hash.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer     -o scripts/basic/hash scripts/basic/hash.c  mkdir -p include/linux include/configmake -f scripts/Makefile.build obj=scripts/kconfig menuconfig  gcc -Wp,-MD,scripts/kconfig/.conf.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer   -I/usr/include/ncurses -DCURSES_LOC="
   
    " -DLOCALE   -c -o scripts/kconfig/conf.o scripts/kconfig/conf.c  gcc -Wp,-MD,scripts/kconfig/.kxgettext.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer   -I/usr/include/ncurses -DCURSES_LOC="
    
     " -DLOCALE   -c -o scripts/kconfig/kxgettext.o scripts/kconfig/kxgettext.c/bin/sh /usr/local/src/linux-2.6.32/scripts/kconfig/lxdialog/check-lxdialog.sh -check gcc -I/usr/include/ncurses -DCURSES_LOC="
     
      " -DLOCALE  -lncursesw  gcc -Wp,-MD,scripts/kconfig/lxdialog/.checklist.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer   -I/usr/include/ncurses -DCURSES_LOC="
      
       " -DLOCALE   -c -o scripts/kconfig/lxdialog/checklist.o scripts/kconfig/lxdialog/checklist.c  gcc -Wp,-MD,scripts/kconfig/lxdialog/.inputbox.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer   -I/usr/include/ncurses -DCURSES_LOC="
       
        " -DLOCALE   -c -o scripts/kconfig/lxdialog/inputbox.o scripts/kconfig/lxdialog/inputbox.c  gcc -Wp,-MD,scripts/kconfig/lxdialog/.menubox.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer   -I/usr/include/ncurses -DCURSES_LOC="
        
         " -DLOCALE -c -o scripts/kconfig/lxdialog/menubox.o scripts/kconfig/lxdialog/menubox.c gcc -Wp,-MD,scripts/kconfig/lxdialog/.textbox.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -I/usr/include/ncurses -DCURSES_LOC="
         
          " -DLOCALE -c -o scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/textbox.c gcc -Wp,-MD,scripts/kconfig/lxdialog/.util.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -I/usr/include/ncurses -DCURSES_LOC="
          
           " -DLOCALE -c -o scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/util.c gcc -Wp,-MD,scripts/kconfig/lxdialog/.yesno.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -I/usr/include/ncurses -DCURSES_LOC="
           
            " -DLOCALE -c -o scripts/kconfig/lxdialog/yesno.o scripts/kconfig/lxdialog/yesno.c gcc -Wp,-MD,scripts/kconfig/.mconf.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -I/usr/include/ncurses -DCURSES_LOC="
            
             " -DLOCALE -c -o scripts/kconfig/mconf.o scripts/kconfig/mconf.c gcc -Wp,-MD,scripts/kconfig/.zconf.tab.o.d -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -I/usr/include/ncurses -DCURSES_LOC="
             
              " -DLOCALE -Iscripts/kconfig -c -o scripts/kconfig/zconf.tab.o scripts/kconfig/zconf.tab.c gcc -o scripts/kconfig/mconf scripts/kconfig/mconf.o scripts/kconfig/zconf.tab.o scripts/kconfig/lxdialog/checklist.o scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/inputbox.o scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/yesno.o scripts/kconfig/lxdialog/menubox.o -lncursesw scripts/kconfig/mconf arch/x86/Kconfig

先分析如下语句

feq ($(KBUILD_EXTMOD),)	# $(KBUILD_EXTMOD为空        ifneq ($(filter config %config,$(MAKECMDGOALS)),)	# $(MAKECMDGOALS)表示 menuconfig 所以满足if条件                config-targets := 1                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) # $(MAKECMDGOALS)只有一个 menuconfig 所以不满足if条件                        mixed-targets := 1                endif        endifendif

由于 config-targets 为1, 而 mixed-targets 为0, 所以进入如下分支

代码流程如下

%config: scripts_basic outputmakefile FORCE	$(Q)mkdir -p include/linux include/config	$(Q)$(MAKE) $(build)=scripts/kconfig $@		依赖1	scripts_basic:		$(Q)$(MAKE) $(build)=scripts/basic		=>make -f scripts/Makefile.build obj=scripts/basic				其中		scripts/Kbuild.include:150:build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj		=>build := -f scripts/Makefile.build obj				Makefile.build 里面找第一个目标编译, 也就是		__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \		 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \		 $(subdir-ym) $(always)		 		其中		scripts/basic/Makefile:13:always                := $(hostprogs-y)		scripts/basic/Makefile:12:hostprogs-y   := fixdep docproc hash		也就是说, __build 需要将 fixdep docproc hash 编译为目标文件。        		Makefile.build 是怎么将 scripts/basic/Makefile 包含进来的呢		# The filename Kbuild has precedence over Makefile		kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))		=>kbuild-dir := $(if $(filter /%,$(obj)),$(obj),$(srctree)/$(obj))		=>kbuild-dir := $(if $(filter /%,scripts/basic),scripts/basic,$(srctree)/scripts/basic)		=>kbuild-dir := scripts/basic				kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)		include $(kbuild-file)		=>kbuild-file := $(if $(wildcard scripts/basic/Kbuild),scripts/basic/Kbuild,scripts/basic/Makefile)		include $(kbuild-file)		=>kbuild-file := scripts/basic/Makefile #scripts/basic/Kbuild不存在, 所以走else分支		include scripts/basic/Makefile		# 由于 $(hostprogs-y) 存在, 所以在 Makefile.build 同时满足如下条件：		# Do not include host rules unless needed		ifneq ($(hostprogs-y)$(hostprogs-m),)		include scripts/Makefile.host		endif				#所以如下条件成立		# C code		# Executables compiled from a single .c file		host-csingle	:= $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))				#进入如下流程, 告诉我们如何编译.c和生成.cmd		$(host-csingle): $(obj)/%: $(src)/%.c FORCE			$(call if_changed_dep,host-csingle)		行为2	$(MAKE) $(build)=scripts/kconfig $@	=>make -f scripts/Makefile.build obj=scripts/kconfig menuconfig		其中 scripts/kconfig/Makefile:20:menuconfig: $(obj)/mconf		进入文件里面查看		menuconfig: $(obj)/mconf			$< $(Kconfig)		=>menuconfig: scripts/kconfig/mconf			scripts/kconfig arch/x86/Kconfig					其中		./scripts/kconfig/Makefile:11:Kconfig := arch/$(SRCARCH)/Kconfig

mconf 的作用是根据 kconfig 生成 .config

main{    conf_parse(av[1]); //解析Kconfig	conf_read(NULL);	set_config_filename(conf_get_configname());	//生成.config		}

Linux之Makefile（filter）

https://blog.csdn.net/zhoudengqing/article/details/41777957

makefile的wildcard函数

https://blog.csdn.net/qq_32693119/article/details/84701554

Makefile中wildcard的介绍

https://www.cnblogs.com/haoxing990/p/4629454.html

linux内核Makefile中的build构建机制

https://blog.csdn.net/metersun/article/details/52212842

配置Linux Kernel时make menuconfig执行流程分析

https://www.cnblogs.com/LoTGu/p/5968042.html

Linux 内核 Makefile 体系简单分析

https://blog.csdn.net/chenliujiang1989/article/details/7539211

linux驱动基础开发3——linux 内核配置机制（make menuconfig、Kconfig、makefile）讲解

https://blog.csdn.net/xdw1985829/article/details/6833319

make menuconfig过程讲解 OS总结的文档不错

https://blog.csdn.net/a746742897/article/details/52247292

https://blog.csdn.net/qingkongyeyue/article/details/52503313

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