forked from Minki/linux
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: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Masahiro Yamada
parent
ba634eceb5
commit
2c1f4f1251
233
Makefile
233
Makefile
@ -186,15 +186,6 @@ ifeq ("$(origin M)", "command line")
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KBUILD_EXTMOD := $(M)
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endif
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# If building an external module we do not care about the all: rule
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# but instead _all depend on modules
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PHONY += all
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ifeq ($(KBUILD_EXTMOD),)
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_all: all
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else
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_all: modules
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endif
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ifeq ($(KBUILD_SRC),)
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# building in the source tree
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srctree := .
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@ -206,6 +197,9 @@ else
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srctree := $(KBUILD_SRC)
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endif
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endif
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export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
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objtree := .
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src := $(srctree)
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obj := $(objtree)
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@ -214,6 +208,74 @@ VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
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export srctree objtree VPATH
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# To make sure we do not include .config for any of the *config targets
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# catch them early, and hand them over to scripts/kconfig/Makefile
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# It is allowed to specify more targets when calling make, including
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# mixing *config targets and build targets.
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# For example 'make oldconfig all'.
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# Detect when mixed targets is specified, and make a second invocation
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# of make so .config is not included in this case either (for *config).
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version_h := include/generated/uapi/linux/version.h
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old_version_h := include/linux/version.h
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no-dot-config-targets := clean mrproper distclean \
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cscope gtags TAGS tags help% %docs check% coccicheck \
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$(version_h) headers_% archheaders archscripts \
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kernelversion %src-pkg
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config-targets := 0
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mixed-targets := 0
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dot-config := 1
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ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
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ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
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dot-config := 0
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endif
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endif
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ifeq ($(KBUILD_EXTMOD),)
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ifneq ($(filter config %config,$(MAKECMDGOALS)),)
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config-targets := 1
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ifneq ($(words $(MAKECMDGOALS)),1)
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mixed-targets := 1
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endif
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endif
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endif
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# install and modules_install need also be processed one by one
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ifneq ($(filter install,$(MAKECMDGOALS)),)
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ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
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mixed-targets := 1
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endif
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endif
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ifeq ($(mixed-targets),1)
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# ===========================================================================
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# We're called with mixed targets (*config and build targets).
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# Handle them one by one.
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PHONY += $(MAKECMDGOALS) __build_one_by_one
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$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
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@:
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__build_one_by_one:
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$(Q)set -e; \
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for i in $(MAKECMDGOALS); do \
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$(MAKE) -f $(srctree)/Makefile $$i; \
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done
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else
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# We need some generic definitions (do not try to remake the file).
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scripts/Kbuild.include: ;
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include scripts/Kbuild.include
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
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KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
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export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
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# SUBARCH tells the usermode build what the underlying arch is. That is set
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# first, and if a usermode build is happening, the "ARCH=um" on the command
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# line overrides the setting of ARCH below. If a native build is happening,
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@ -308,40 +370,6 @@ HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
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-Wno-missing-field-initializers -fno-delete-null-pointer-checks
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endif
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# Decide whether to build built-in, modular, or both.
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# Normally, just do built-in.
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KBUILD_MODULES :=
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KBUILD_BUILTIN := 1
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# If we have only "make modules", don't compile built-in objects.
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# When we're building modules with modversions, we need to consider
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# the built-in objects during the descend as well, in order to
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# make sure the checksums are up to date before we record them.
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ifeq ($(MAKECMDGOALS),modules)
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KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
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endif
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# If we have "make <whatever> modules", compile modules
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# in addition to whatever we do anyway.
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# Just "make" or "make all" shall build modules as well
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ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
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KBUILD_MODULES := 1
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endif
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ifeq ($(MAKECMDGOALS),)
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KBUILD_MODULES := 1
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endif
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export KBUILD_MODULES KBUILD_BUILTIN
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export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
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# We need some generic definitions (do not try to remake the file).
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scripts/Kbuild.include: ;
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include scripts/Kbuild.include
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# Make variables (CC, etc...)
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AS = $(CROSS_COMPILE)as
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LD = $(CROSS_COMPILE)ld
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@ -406,11 +434,6 @@ KBUILD_AFLAGS_MODULE := -DMODULE
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KBUILD_CFLAGS_MODULE := -DMODULE
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KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
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KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
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export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
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export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
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export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
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export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
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@ -459,73 +482,6 @@ ifneq ($(KBUILD_SRC),)
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$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
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endif
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# Support for using generic headers in asm-generic
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PHONY += asm-generic uapi-asm-generic
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asm-generic: uapi-asm-generic
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
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src=asm obj=arch/$(SRCARCH)/include/generated/asm
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uapi-asm-generic:
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
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src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
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# To make sure we do not include .config for any of the *config targets
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# catch them early, and hand them over to scripts/kconfig/Makefile
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# It is allowed to specify more targets when calling make, including
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# mixing *config targets and build targets.
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# For example 'make oldconfig all'.
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# Detect when mixed targets is specified, and make a second invocation
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# of make so .config is not included in this case either (for *config).
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version_h := include/generated/uapi/linux/version.h
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old_version_h := include/linux/version.h
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no-dot-config-targets := clean mrproper distclean \
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cscope gtags TAGS tags help% %docs check% coccicheck \
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$(version_h) headers_% archheaders archscripts \
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kernelversion %src-pkg
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config-targets := 0
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mixed-targets := 0
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dot-config := 1
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ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
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ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
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dot-config := 0
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endif
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endif
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ifeq ($(KBUILD_EXTMOD),)
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ifneq ($(filter config %config,$(MAKECMDGOALS)),)
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config-targets := 1
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ifneq ($(words $(MAKECMDGOALS)),1)
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mixed-targets := 1
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endif
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endif
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endif
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# install and modules_install need also be processed one by one
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ifneq ($(filter install,$(MAKECMDGOALS)),)
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ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
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mixed-targets := 1
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endif
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endif
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ifeq ($(mixed-targets),1)
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# ===========================================================================
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# We're called with mixed targets (*config and build targets).
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# Handle them one by one.
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PHONY += $(MAKECMDGOALS) __build_one_by_one
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$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
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@:
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__build_one_by_one:
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$(Q)set -e; \
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for i in $(MAKECMDGOALS); do \
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$(MAKE) -f $(srctree)/Makefile $$i; \
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done
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else
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ifeq ($(config-targets),1)
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# ===========================================================================
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# *config targets only - make sure prerequisites are updated, and descend
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@ -548,6 +504,44 @@ else
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# Build targets only - this includes vmlinux, arch specific targets, clean
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# targets and others. In general all targets except *config targets.
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# If building an external module we do not care about the all: rule
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# but instead _all depend on modules
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PHONY += all
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ifeq ($(KBUILD_EXTMOD),)
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_all: all
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else
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_all: modules
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endif
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# Decide whether to build built-in, modular, or both.
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# Normally, just do built-in.
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KBUILD_MODULES :=
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KBUILD_BUILTIN := 1
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# If we have only "make modules", don't compile built-in objects.
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# When we're building modules with modversions, we need to consider
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# the built-in objects during the descend as well, in order to
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# make sure the checksums are up to date before we record them.
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ifeq ($(MAKECMDGOALS),modules)
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KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
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endif
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# If we have "make <whatever> modules", compile modules
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# in addition to whatever we do anyway.
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# Just "make" or "make all" shall build modules as well
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ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
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KBUILD_MODULES := 1
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endif
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ifeq ($(MAKECMDGOALS),)
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KBUILD_MODULES := 1
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endif
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export KBUILD_MODULES KBUILD_BUILTIN
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ifeq ($(KBUILD_EXTMOD),)
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# Additional helpers built in scripts/
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# Carefully list dependencies so we do not try to build scripts twice
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@ -1063,6 +1057,15 @@ prepare0: archprepare gcc-plugins
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# All the preparing..
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prepare: prepare0 prepare-objtool
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# Support for using generic headers in asm-generic
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PHONY += asm-generic uapi-asm-generic
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asm-generic: uapi-asm-generic
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
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src=asm obj=arch/$(SRCARCH)/include/generated/asm
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uapi-asm-generic:
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$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
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src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
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PHONY += prepare-objtool
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prepare-objtool: $(objtool_target)
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