make menuconfig 分析

本文主要是介绍make menuconfig 分析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

make menuconfig V=1：

1 	make -f ./scripts/Makefile.build obj=scripts/basic
2 	  cc -Wp,-MD,scripts/basic/.fixdep.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11     -o scripts/basic/fixdep scripts/basic/fixdep.c   
3 	rm -f .tmp_quiet_recordmcount
4 	make -f ./scripts/Makefile.build obj=scripts/kconfig menuconfig
5 	set -e; mkdir -p scripts/kconfig/; 	/bin/bash scripts/kconfig/mconf-cfg.sh < scripts/kconfig/mconf-cfg.sh > scripts/kconfig/.mconf-cfg.tmp; if [ -r scripts/kconfig/.mconf-cfg ] && cmp -s scripts/kconfig/.mconf-cfg scripts/kconfig/.mconf-cfg.tmp; then rm -f scripts/kconfig/.mconf-cfg.tmp; else : '  UPD     scripts/kconfig/.mconf-cfg'; mv -f scripts/kconfig/.mconf-cfg.tmp scripts/kconfig/.mconf-cfg; fi
6 	  cc -Wp,-MD,scripts/kconfig/.mconf.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/mconf.o scripts/kconfig/mconf.c
7 	  bison -oscripts/kconfig/zconf.tab.c -t -l scripts/kconfig/zconf.y
8 	  flex -oscripts/kconfig/zconf.lex.c -L scripts/kconfig/zconf.l
9 	  cc -Wp,-MD,scripts/kconfig/.zconf.tab.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -Iscripts/kconfig -c -o scripts/kconfig/zconf.tab.o scripts/kconfig/zconf.tab.c
10	  cc -Wp,-MD,scripts/kconfig/lxdialog/.checklist.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/checklist.o scripts/kconfig/lxdialog/checklist.c
11	  cc -Wp,-MD,scripts/kconfig/lxdialog/.inputbox.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/inputbox.o scripts/kconfig/lxdialog/inputbox.c
12	  cc -Wp,-MD,scripts/kconfig/lxdialog/.menubox.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/menubox.o scripts/kconfig/lxdialog/menubox.c
13	  cc -Wp,-MD,scripts/kconfig/lxdialog/.textbox.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/textbox.c
14	  cc -Wp,-MD,scripts/kconfig/lxdialog/.util.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/util.c
15	  cc -Wp,-MD,scripts/kconfig/lxdialog/.yesno.o.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11    -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -c -o scripts/kconfig/lxdialog/yesno.o scripts/kconfig/lxdialog/yesno.c
16	  cc   -o scripts/kconfig/mconf scripts/kconfig/mconf.o scripts/kconfig/zconf.tab.o scripts/kconfig/lxdialog/checklist.o scripts/kconfig/lxdialog/inputbox.o scripts/kconfig/lxdialog/menubox.o scripts/kconfig/lxdialog/textbox.o scripts/kconfig/lxdialog/util.o scripts/kconfig/lxdialog/yesno.o   -Wl,-Bsymbolic-functions -lncursesw -ltinfo
17	scripts/kconfig/mconf  Kconfig

94 	ifeq ("$(origin V)", "command line")
95 	  KBUILD_VERBOSE = $(V)
96 	endif
97 	ifndef KBUILD_VERBOSE
98 	  KBUILD_VERBOSE = 0
99 	endif
100
101	ifeq ($(KBUILD_VERBOSE),1)
102	  quiet =
103	  Q =
104	else
105	  quiet=quiet_
106	  Q = @
107	endif
......
481	scripts_basic:
482		$(Q)$(MAKE) $(build)=scripts/basic
483		$(Q)rm -f .tmp_quiet_recordmcount
......
492	outputmakefile:
493	ifneq ($(KBUILD_SRC),)
494		$(Q)ln -fsn $(srctree) source
495		$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
496			$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
497	endif
......	
563	%config: scripts_basic outputmakefile FORCE
564		$(Q)$(MAKE) $(build)=scripts/kconfig $@
......
2318 FORCE:

当在命令行中输入： make menuconfig V=1 时，94行条件成立，KBUILD_VERBOSE = 1，101行条件成立，quiet 和 Q 为空，则输出整个命令。
输入命令自动匹配顶层 Makefile 的第563 行并执行，由于目标 %config依赖 scripts_basic 、outputmakefile和FORCE， 则执行顺序如下：

1. 执行依赖 scripts_basic ，481-483行
2. 执行依赖 outputmakefile，492-497行
3. 执行依赖 FORCE，什么都不做，2318行

这三个依赖的生成见《make xxxx_defconfig 分析》中的步骤1和步骤2：

打印和执行 $(cmd_host-csingle) 命令【即生成 scripts/basic/fixdep 工具】，将实现目标 scripts/basic/fixdep 所用的命令、源码、头文件等信息全部写入到 scripts/basic/.fixdep.cmd文件中。
回显 1-3 行：

1 make -f ./scripts/Makefile.build obj=scripts/basic
2   cc -Wp,-MD,scripts/basic/.fixdep.d -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer   -std=gnu11     -o scripts/basic/fixdep scripts/basic/fixdep.c   
3 rm -f .tmp_quiet_recordmcount

生成目标%config

由上面的分析可知，%config 的三个依赖 scripts_basic、 outputmakefile 和 FORCE都已经实现。

1. 依赖scripts_basic：为了生成scripts/basic/fixdep
2. 依赖outputmakefile：什么都不做
3. 依赖FORCE：什么都不做

 
$(build)在 scripts/Kbuild.include 文件【在顶层Makefile的386行引用】的第184行定义：

184	build := -f $(srctree)/scripts/Makefile.build obj

最终展开为：

563	%config: scripts_basic outputmakefile FORCE
564		make -f ./scripts/Makefile.build obj=scripts/kconfig menuconfig

结果：由 < 3. make ./scripts/Makefile.build obj=scripts/kconfig menuconfig > 分析可知：

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