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Commit 2c1f4f12 authored by Masahiro Yamada's avatar Masahiro Yamada
Browse files

kbuild: re-order the code to not parse unnecessary variables 



The top Makefile is divided into some sections such as mixed targets,
config targets, build targets, etc.

When we build mixed targets, Kbuild just invokes submake to process
them one by one.  In this case, compiler-related variables like CC,
KBUILD_CFLAGS, etc. are unneeded.

Check what kind of targets we are building first, and parse variables
for building only when necessary.

Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent ba634ece

Makefile

+118 −115
Original line number Diff line number Diff line
@@ -186,15 +186,6 @@ ifeq ("$(origin M)", "command line") 
  KBUILD_EXTMOD := $(M)

endif



# If building an external module we do not care about the all: rule

# but instead _all depend on modules

PHONY += all

ifeq ($(KBUILD_EXTMOD),)

_all: all

else

_all: modules

endif



ifeq ($(KBUILD_SRC),)

        # building in the source tree

        srctree := .
@@ -206,6 +197,9 @@ else 
                srctree := $(KBUILD_SRC)

        endif

endif



export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC



objtree		:= .

src		:= $(srctree)

obj		:= $(objtree)
@@ -214,6 +208,74 @@ VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) 


export srctree objtree VPATH



# To make sure we do not include .config for any of the *config targets

# catch them early, and hand them over to scripts/kconfig/Makefile

# It is allowed to specify more targets when calling make, including

# mixing *config targets and build targets.

# For example 'make oldconfig all'.

# Detect when mixed targets is specified, and make a second invocation

# of make so .config is not included in this case either (for *config).



version_h := include/generated/uapi/linux/version.h

old_version_h := include/linux/version.h



no-dot-config-targets := clean mrproper distclean \

			 cscope gtags TAGS tags help% %docs check% coccicheck \

			 $(version_h) headers_% archheaders archscripts \

			 kernelversion %src-pkg



config-targets := 0

mixed-targets  := 0

dot-config     := 1



ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)

	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)

		dot-config := 0

	endif

endif



ifeq ($(KBUILD_EXTMOD),)

        ifneq ($(filter config %config,$(MAKECMDGOALS)),)

                config-targets := 1

                ifneq ($(words $(MAKECMDGOALS)),1)

                        mixed-targets := 1

                endif

        endif

endif

# install and modules_install need also be processed one by one

ifneq ($(filter install,$(MAKECMDGOALS)),)

        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)

	        mixed-targets := 1

        endif

endif



ifeq ($(mixed-targets),1)

# ===========================================================================

# We're called with mixed targets (*config and build targets).

# Handle them one by one.



PHONY += $(MAKECMDGOALS) __build_one_by_one



$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one

	@:



__build_one_by_one:

	$(Q)set -e; \

	for i in $(MAKECMDGOALS); do \

		$(MAKE) -f $(srctree)/Makefile $$i; \

	done



else



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

scripts/Kbuild.include: ;

include scripts/Kbuild.include



# Read KERNELRELEASE from include/config/kernel.release (if it exists)

KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)

KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)

export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION



# SUBARCH tells the usermode build what the underlying arch is.  That is set

# first, and if a usermode build is happening, the "ARCH=um" on the command

# line overrides the setting of ARCH below.  If a native build is happening,
@@ -308,40 +370,6 @@ HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \ 
		-Wno-missing-field-initializers -fno-delete-null-pointer-checks

endif



# 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 $(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 ($(filter all _all modules,$(MAKECMDGOALS)),)

  KBUILD_MODULES := 1

endif



ifeq ($(MAKECMDGOALS),)

  KBUILD_MODULES := 1

endif



export KBUILD_MODULES KBUILD_BUILTIN

export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD



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

scripts/Kbuild.include: ;

include scripts/Kbuild.include



# Make variables (CC, etc...)

AS		= $(CROSS_COMPILE)as

LD		= $(CROSS_COMPILE)ld
@@ -406,11 +434,6 @@ KBUILD_AFLAGS_MODULE := -DMODULE 
KBUILD_CFLAGS_MODULE  := -DMODULE

KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds



# Read KERNELRELEASE from include/config/kernel.release (if it exists)

KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)

KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)



export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION

export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC

export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES

export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
@@ -459,73 +482,6 @@ ifneq ($(KBUILD_SRC),) 
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)

endif



# Support for using generic headers in asm-generic

PHONY += asm-generic uapi-asm-generic

asm-generic: uapi-asm-generic

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \

	            src=asm obj=arch/$(SRCARCH)/include/generated/asm

uapi-asm-generic:

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \

	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm



# To make sure we do not include .config for any of the *config targets

# catch them early, and hand them over to scripts/kconfig/Makefile

# It is allowed to specify more targets when calling make, including

# mixing *config targets and build targets.

# For example 'make oldconfig all'.

# Detect when mixed targets is specified, and make a second invocation

# of make so .config is not included in this case either (for *config).



version_h := include/generated/uapi/linux/version.h

old_version_h := include/linux/version.h



no-dot-config-targets := clean mrproper distclean \

			 cscope gtags TAGS tags help% %docs check% coccicheck \

			 $(version_h) headers_% archheaders archscripts \

			 kernelversion %src-pkg



config-targets := 0

mixed-targets  := 0

dot-config     := 1



ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)

	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)

		dot-config := 0

	endif

endif



ifeq ($(KBUILD_EXTMOD),)

        ifneq ($(filter config %config,$(MAKECMDGOALS)),)

                config-targets := 1

                ifneq ($(words $(MAKECMDGOALS)),1)

                        mixed-targets := 1

                endif

        endif

endif

# install and modules_install need also be processed one by one

ifneq ($(filter install,$(MAKECMDGOALS)),)

        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)

	        mixed-targets := 1

        endif

endif



ifeq ($(mixed-targets),1)

# ===========================================================================

# We're called with mixed targets (*config and build targets).

# Handle them one by one.



PHONY += $(MAKECMDGOALS) __build_one_by_one



$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one

	@:



__build_one_by_one:

	$(Q)set -e; \

	for i in $(MAKECMDGOALS); do \

		$(MAKE) -f $(srctree)/Makefile $$i; \

	done



else

ifeq ($(config-targets),1)

# ===========================================================================

# *config targets only - make sure prerequisites are updated, and descend
@@ -548,6 +504,44 @@ else 
# Build targets only - this includes vmlinux, arch specific targets, clean

# targets and others. In general all targets except *config targets.



# If building an external module we do not care about the all: rule

# but instead _all depend on modules

PHONY += all

ifeq ($(KBUILD_EXTMOD),)

_all: all

else

_all: modules

endif



# 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 $(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 ($(filter all _all modules,$(MAKECMDGOALS)),)

  KBUILD_MODULES := 1

endif



ifeq ($(MAKECMDGOALS),)

  KBUILD_MODULES := 1

endif



export KBUILD_MODULES KBUILD_BUILTIN



ifeq ($(KBUILD_EXTMOD),)

# Additional helpers built in scripts/

# Carefully list dependencies so we do not try to build scripts twice
@@ -1063,6 +1057,15 @@ prepare0: archprepare gcc-plugins 
# All the preparing..

prepare: prepare0 prepare-objtool



# Support for using generic headers in asm-generic

PHONY += asm-generic uapi-asm-generic

asm-generic: uapi-asm-generic

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \

	            src=asm obj=arch/$(SRCARCH)/include/generated/asm

uapi-asm-generic:

	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \

	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm



PHONY += prepare-objtool

prepare-objtool: $(objtool_target)