make menuconfig执行流程分析[通俗易懂]

%config: scripts_basic outputmakefile FORCE

    (Q)(Q)(MAKE) $(build)=scripts/kconfig $@

menuconfig: scripts_basic outputmakefile FORCE

    (Q)(Q)(MAKE) $(build)=scripts/kconfig menuconfig

# Beautify output

# —————————————————————————

#

# Normally, we echo the whole command before executing it. By making

# that echo (((quiet)$(cmd)), we now have the possibility to set

# $(quiet) to choose other forms of output instead, e.g.

#

#         quiet_cmd_cc_o_c = Compiling (RELDIR)/(RELDIR)/@

#         cmd_cc_o_c       = (CC)(CC)(c_flags) -c -o @@<

#

# If $(quiet) is empty, the whole command will be printed.

# If it is set to “quiet_”, only the short version will be printed.

# If it is set to “silent_”, nothing will be printed at all, since

# the variable $(silent_cmd_cc_o_c) doesn’t exist.

#

# A simple variant is to prefix commands with $(Q) – that’s useful

# for commands that shall be hidden in non-verbose mode.

#

#   (Q)ln(Q)ln@ :<

#

# If KBUILD_VERBOSE equals 0 then the above command will be hidden.

# If KBUILD_VERBOSE equals 1 then the above command is displayed.

#

# To put more focus on warnings, be less verbose as default

# Use ‘make V=1’ to see the full commands

ifeq (“$(origin V)“, “command line”)

  KBUILD_VERBOSE = $(V)

endif

ifndef KBUILD_VERBOSE

  KBUILD_VERBOSE = 0

endif

ifeq ($(KBUILD_VERBOSE),1)

  quiet =

  Q =

else

  quiet=quiet_

  Q = @

endif

###

# Shorthand for (Q)(Q)(MAKE) -f scripts/Makefile.build obj=

# Usage:

# (Q)(Q)(MAKE) $(build)=dir

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

# We need some generic definitions (do not try to remake the file).

$(srctree)/scripts/Kbuild.include: ;

include $(srctree)/scripts/Kbuild.include

PHONY += FORCE

FORCE:

# Declare the contents of the .PHONY variable as phony.  We keep that

# information in a variable so we can use it in if_changed and friends.

.PHONY: $(PHONY)

# Basic helpers built in scripts/

PHONY += scripts_basic

scripts_basic:

    (Q)(Q)(MAKE) $(build)=scripts/basic

    $(Q)rm -f .tmp_quiet_recordmcount

# Basic helpers built in scripts/

PHONY += scripts_basic

scripts_basic:

    $(Q) make -f $(srctree)/scripts/Makefile.build obj=scripts/basic

    $(Q) rm -f .tmp_quiet_recordmcount

src := $(obj)

# The filename Kbuild has precedence over Makefile

kbuild-dir := (if(if(filter /%,(src)),(src)),(src),(srctree)/(srctree)/(src))

kbuild-file := (if(if(wildcard (kbuild−dir)/Kbuild),(kbuild−dir)/Kbuild),(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)

include $(kbuild-file)

# If the save-* variables changed error out

ifeq ($(KBUILD_NOPEDANTIC),)

        ifneq (“$(save-cflags)“,”$(CFLAGS)“)

                (errorCFLAGSwaschangedin”(errorCFLAGSwaschangedin”(kbuild-file)”. Fix it to use ccflags-y)

        endif

endif

include scripts/Makefile.lib

__build: (if(if(KBUILD_BUILTIN),(builtin−target)(builtin−target)(lib-target) $(extra-y)) \

     (if(if(KBUILD_MODULES),(obj−m)(obj−m)(modorder-target)) \

     $(subdir-ym) $(always)

     @:

# Decide whether to build built-in, modular, or both.

# Normally, just do built-in.

KBUILD_MODULES :=

KBUILD_BUILTIN := 1

# If we have only “make modules”, don’t compile built-in objects.

# When we’re building modules with modversions, we need to consider

# the built-in objects during the descend as well, in order to

# make sure the checksums are up to date before we record them.

ifeq ($(MAKECMDGOALS),modules)

  KBUILD_BUILTIN := (if(if(CONFIG_MODVERSIONS),1)

endif

# If we have “make <whatever> modules”, compile modules

# in addition to whatever we do anyway.

# Just “make” or “make all” shall build modules as well

ifneq ((filterallallmodules,(filterallallmodules,(MAKECMDGOALS)),)

  KBUILD_MODULES := 1

endif

ifeq ($(MAKECMDGOALS),)

  KBUILD_MODULES := 1

endif

export KBUILD_MODULES KBUILD_BUILTIN

export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

__build: (builtin−target)(builtin−target)(lib-target) (extra−y)(extra−y)(subdir-ym) $(always)

     @:

PHONY += outputmakefile

# outputmakefile generates a Makefile in the output directory, if using a

# separate output directory. This allows convenient use of make in the

# output directory.

outputmakefile:

ifneq ($(KBUILD_SRC),)

    $(Q)ln -fsn $(srctree) source

    (Q)(Q)(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \

    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)

endif

src := $(obj)

PHONY := __build

__build:

# Init all relevant variables used in kbuild files so

# 1) they have correct type

# 2) they do not inherit any value from the environment

obj-y :=

obj-m :=

lib-y :=

lib-m :=

always :=

targets :=

subdir-y :=

subdir-m :=

EXTRA_AFLAGS   :=

EXTRA_CFLAGS   :=

EXTRA_CPPFLAGS :=

EXTRA_LDFLAGS  :=

asflags-y  :=

ccflags-y  :=

cppflags-y :=

ldflags-y  :=

subdir-asflags-y :=

subdir-ccflags-y :=

# Read auto.conf if it exists, otherwise ignore

-include include/config/auto.conf

include scripts/Kbuild.include

# For backward compatibility check that these variables do not change

save-cflags := $(CFLAGS)

# The filename Kbuild has precedence over Makefile

kbuild-dir := (if(if(filter /%,(src)),(src)),(src),(srctree)/(srctree)/(src))

kbuild-file := (if(if(wildcard (kbuild−dir)/Kbuild),(kbuild−dir)/Kbuild),(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)

include $(kbuild-file)

PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config \

    localmodconfig localyesconfig

ifdef KBUILD_KCONFIG

Kconfig := $(KBUILD_KCONFIG)

else

Kconfig := Kconfig

endif

# We need this, in case the user has it in its environment

unexport CONFIG_

… …

 menuconfig: $(obj)/mconf

    $< $(Kconfig)

… …

lxdialog := lxdialog/checklist.o lxdialog/util.o lxdialog/inputbox.o

lxdialog += lxdialog/textbox.o lxdialog/yesno.o lxdialog/menubox.o

conf-objs   := conf.o  zconf.tab.o

mconf-objs     := mconf.o zconf.tab.o $(lxdialog)

nconf-objs     := nconf.o zconf.tab.o nconf.gui.o

kxgettext-objs  := kxgettext.o zconf.tab.o

qconf-cxxobjs   := qconf.o

qconf-objs  := zconf.tab.o

gconf-objs  := gconf.o zconf.tab.o

hostprogs-y := conf nconf mconf kxgettext qconf gconf

clean-files := qconf.moc .tmp_qtcheck .tmp_gtkcheck

clean-files += zconf.tab.c zconf.lex.c zconf.hash.c gconf.glade.h

clean-files     += config.pot linux.pot

# Check that we have the required ncurses stuff installed for lxdialog (menuconfig)

PHONY += $(obj)/dochecklxdialog

(addprefix(addprefix(obj)/,$(lxdialog)): $(obj)/dochecklxdialog

$(obj)/dochecklxdialog:

    (Q)(Q)(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTLOADLIBES_mconf)

always := dochecklxdialog

%config: scripts_basic outputmakefile FORCE

    (Q)(Q)(MAKE) $(build)=scripts/kconfig $@

menuconfig: scripts_basic outputmakefile FORCE

    (Q)(Q)(MAKE) $(build)=scripts/kconfig menuconfig

# Beautify output

# —————————————————————————

#

# Normally, we echo the whole command before executing it. By making

# that echo (((quiet)$(cmd)), we now have the possibility to set

# $(quiet) to choose other forms of output instead, e.g.

#

#         quiet_cmd_cc_o_c = Compiling (RELDIR)/(RELDIR)/@

#         cmd_cc_o_c       = (CC)(CC)(c_flags) -c -o @@<

#

# If $(quiet) is empty, the whole command will be printed.

# If it is set to “quiet_”, only the short version will be printed.

# If it is set to “silent_”, nothing will be printed at all, since

# the variable $(silent_cmd_cc_o_c) doesn’t exist.

#

# A simple variant is to prefix commands with $(Q) – that’s useful

# for commands that shall be hidden in non-verbose mode.

#

#   (Q)ln(Q)ln@ :<

#

# If KBUILD_VERBOSE equals 0 then the above command will be hidden.

# If KBUILD_VERBOSE equals 1 then the above command is displayed.

#

# To put more focus on warnings, be less verbose as default

# Use ‘make V=1’ to see the full commands

ifeq (“$(origin V)“, “command line”)

  KBUILD_VERBOSE = $(V)

endif

ifndef KBUILD_VERBOSE

  KBUILD_VERBOSE = 0

endif

ifeq ($(KBUILD_VERBOSE),1)

  quiet =

  Q =

else

  quiet=quiet_

  Q = @

endif

###

# Shorthand for (Q)(Q)(MAKE) -f scripts/Makefile.build obj=

# Usage:

# (Q)(Q)(MAKE) $(build)=dir

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

# We need some generic definitions (do not try to remake the file).

$(srctree)/scripts/Kbuild.include: ;

include $(srctree)/scripts/Kbuild.include

PHONY += FORCE

FORCE:

# Declare the contents of the .PHONY variable as phony.  We keep that

# information in a variable so we can use it in if_changed and friends.

.PHONY: $(PHONY)

# Basic helpers built in scripts/

PHONY += scripts_basic

scripts_basic:

    (Q)(Q)(MAKE) $(build)=scripts/basic

    $(Q)rm -f .tmp_quiet_recordmcount

# Basic helpers built in scripts/

PHONY += scripts_basic

scripts_basic:

    $(Q) make -f $(srctree)/scripts/Makefile.build obj=scripts/basic

    $(Q) rm -f .tmp_quiet_recordmcount

src := $(obj)

# The filename Kbuild has precedence over Makefile

kbuild-dir := (if(if(filter /%,(src)),(src)),(src),(srctree)/(srctree)/(src))

kbuild-file := (if(if(wildcard (kbuild−dir)/Kbuild),(kbuild−dir)/Kbuild),(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)

include $(kbuild-file)

# If the save-* variables changed error out

ifeq ($(KBUILD_NOPEDANTIC),)

        ifneq (“$(save-cflags)“,”$(CFLAGS)“)

                (errorCFLAGSwaschangedin”(errorCFLAGSwaschangedin”(kbuild-file)”. Fix it to use ccflags-y)

        endif

endif

include scripts/Makefile.lib

__build: (if(if(KBUILD_BUILTIN),(builtin−target)(builtin−target)(lib-target) $(extra-y)) \

     (if(if(KBUILD_MODULES),(obj−m)(obj−m)(modorder-target)) \

     $(subdir-ym) $(always)

     @:

# Decide whether to build built-in, modular, or both.

# Normally, just do built-in.

KBUILD_MODULES :=

KBUILD_BUILTIN := 1

# If we have only “make modules”, don’t compile built-in objects.

# When we’re building modules with modversions, we need to consider

# the built-in objects during the descend as well, in order to

# make sure the checksums are up to date before we record them.

ifeq ($(MAKECMDGOALS),modules)

  KBUILD_BUILTIN := (if(if(CONFIG_MODVERSIONS),1)

endif

# If we have “make <whatever> modules”, compile modules

# in addition to whatever we do anyway.

# Just “make” or “make all” shall build modules as well

ifneq ((filterallallmodules,(filterallallmodules,(MAKECMDGOALS)),)

  KBUILD_MODULES := 1

endif

ifeq ($(MAKECMDGOALS),)

  KBUILD_MODULES := 1

endif

export KBUILD_MODULES KBUILD_BUILTIN

export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

__build: (builtin−target)(builtin−target)(lib-target) (extra−y)(extra−y)(subdir-ym) $(always)

     @:

PHONY += outputmakefile

# outputmakefile generates a Makefile in the output directory, if using a

# separate output directory. This allows convenient use of make in the

# output directory.

outputmakefile:

ifneq ($(KBUILD_SRC),)

    $(Q)ln -fsn $(srctree) source

    (Q)(Q)(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \

    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)

endif

src := $(obj)

PHONY := __build

__build:

# Init all relevant variables used in kbuild files so

# 1) they have correct type

# 2) they do not inherit any value from the environment

obj-y :=

obj-m :=

lib-y :=

lib-m :=

always :=

targets :=

subdir-y :=

subdir-m :=

EXTRA_AFLAGS   :=

EXTRA_CFLAGS   :=

EXTRA_CPPFLAGS :=

EXTRA_LDFLAGS  :=

asflags-y  :=

ccflags-y  :=

cppflags-y :=

ldflags-y  :=

subdir-asflags-y :=

subdir-ccflags-y :=

# Read auto.conf if it exists, otherwise ignore

-include include/config/auto.conf

include scripts/Kbuild.include

# For backward compatibility check that these variables do not change

save-cflags := $(CFLAGS)

# The filename Kbuild has precedence over Makefile

kbuild-dir := (if(if(filter /%,(src)),(src)),(src),(srctree)/(srctree)/(src))

kbuild-file := (if(if(wildcard (kbuild−dir)/Kbuild),(kbuild−dir)/Kbuild),(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)

include $(kbuild-file)

PHONY += oldconfig xconfig gconfig menuconfig config silentoldconfig update-po-config \

    localmodconfig localyesconfig

ifdef KBUILD_KCONFIG

Kconfig := $(KBUILD_KCONFIG)

else

Kconfig := Kconfig

endif

# We need this, in case the user has it in its environment

unexport CONFIG_

… …

 menuconfig: $(obj)/mconf

    $< $(Kconfig)

… …

lxdialog := lxdialog/checklist.o lxdialog/util.o lxdialog/inputbox.o

lxdialog += lxdialog/textbox.o lxdialog/yesno.o lxdialog/menubox.o

conf-objs   := conf.o  zconf.tab.o

mconf-objs     := mconf.o zconf.tab.o $(lxdialog)

nconf-objs     := nconf.o zconf.tab.o nconf.gui.o

kxgettext-objs  := kxgettext.o zconf.tab.o

qconf-cxxobjs   := qconf.o

qconf-objs  := zconf.tab.o

gconf-objs  := gconf.o zconf.tab.o

hostprogs-y := conf nconf mconf kxgettext qconf gconf

clean-files := qconf.moc .tmp_qtcheck .tmp_gtkcheck

clean-files += zconf.tab.c zconf.lex.c zconf.hash.c gconf.glade.h

clean-files     += config.pot linux.pot

# Check that we have the required ncurses stuff installed for lxdialog (menuconfig)

PHONY += $(obj)/dochecklxdialog

(addprefix(addprefix(obj)/,$(lxdialog)): $(obj)/dochecklxdialog

$(obj)/dochecklxdialog:

    (Q)(Q)(CONFIG_SHELL) $(check-lxdialog) -check $(HOSTCC) $(HOST_EXTRACFLAGS) $(HOSTLOADLIBES_mconf)

always := dochecklxdialog