Makefile 56.1 KB
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VERSION = 4
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PATCHLEVEL = 7
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SUBLEVEL = 0
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EXTRAVERSION = -rc1
NAME = Psychotic Stoned Sheep
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# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

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# o Do not use make's built-in rules and variables
#   (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
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# Avoid funny character set dependencies
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unexport LC_ALL
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LC_COLLATE=C
LC_NUMERIC=C
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export LC_COLLATE LC_NUMERIC
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# Avoid interference with shell env settings
unexport GREP_OPTIONS

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# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

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# 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 $(RELDIR)/$@
#         cmd_cc_o_c       = $(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 $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
#
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# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

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ifeq ("$(origin V)", "command line")
  KBUILD_VERBOSE = $(V)
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endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0
endif

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ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif

# If the user is running make -s (silent mode), suppress echoing of
# commands

ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  quiet=silent_
endif
else					# make-3.8x
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  quiet=silent_
endif
endif

export quiet Q KBUILD_VERBOSE

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# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
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#
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# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
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ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
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endif

# That's our default target when none is given on the command line
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PHONY := _all
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_all:

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# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

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ifneq ($(words $(subst :, ,$(CURDIR))), 1)
  $(error main directory cannot contain spaces nor colons)
endif

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ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
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KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
								&& /bin/pwd)
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$(if $(KBUILD_OUTPUT),, \
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     $(error failed to create output directory "$(saved-output)"))
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PHONY += $(MAKECMDGOALS) sub-make

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$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
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	@:
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sub-make:
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	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
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	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
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# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)

# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)

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# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

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# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "Documentation/sparse.txt" for more details, including
# where to get the "sparse" utility.

ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
  KBUILD_CHECKSRC = 0
endif

# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
  KBUILD_EXTMOD ?= $(SUBDIRS)
endif

ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

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# If building an external module we do not care about the all: rule
# but instead _all depend on modules
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PHONY += all
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ifeq ($(KBUILD_EXTMOD),)
_all: all
else
_all: modules
endif

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ifeq ($(KBUILD_SRC),)
        # building in the source tree
        srctree := .
else
        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
                # building in a subdirectory of the source tree
                srctree := ..
        else
                srctree := $(KBUILD_SRC)
        endif
endif
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objtree		:= .
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src		:= $(srctree)
obj		:= $(objtree)

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VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
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export srctree objtree VPATH
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# 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,
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# then ARCH is assigned, getting whatever value it gets normally, and
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# SUBARCH is subsequently ignored.

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SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
				  -e s/sun4u/sparc64/ \
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				  -e s/arm.*/arm/ -e s/sa110/arm/ \
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				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
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				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
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				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
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# Cross compiling and selecting different set of gcc/bin-utils
# ---------------------------------------------------------------------------
#
# When performing cross compilation for other architectures ARCH shall be set
# to the target architecture. (See arch/* for the possibilities).
# ARCH can be set during invocation of make:
# make ARCH=ia64
# Another way is to have ARCH set in the environment.
# The default ARCH is the host where make is executed.

# CROSS_COMPILE specify the prefix used for all executables used
# during compilation. Only gcc and related bin-utils executables
# are prefixed with $(CROSS_COMPILE).
# CROSS_COMPILE can be set on the command line
# make CROSS_COMPILE=ia64-linux-
# Alternatively CROSS_COMPILE can be set in the environment.
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# A third alternative is to store a setting in .config so that plain
# "make" in the configured kernel build directory always uses that.
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# Default value for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
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ARCH		?= $(SUBARCH)
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CROSS_COMPILE	?= $(CONFIG_CROSS_COMPILE:"%"=%)
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# Architecture as present in compile.h
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UTS_MACHINE 	:= $(ARCH)
SRCARCH 	:= $(ARCH)
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# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
        SRCARCH := x86
endif
ifeq ($(ARCH),x86_64)
        SRCARCH := x86
endif
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# Additional ARCH settings for sparc
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ifeq ($(ARCH),sparc32)
       SRCARCH := sparc
endif
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ifeq ($(ARCH),sparc64)
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       SRCARCH := sparc
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endif
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# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
       SRCARCH := sh
endif

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# Additional ARCH settings for tile
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ifeq ($(ARCH),tilepro)
       SRCARCH := tile
endif
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ifeq ($(ARCH),tilegx)
       SRCARCH := tile
endif

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# Where to locate arch specific headers
hdr-arch  := $(SRCARCH)

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KCONFIG_CONFIG	?= .config
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export KCONFIG_CONFIG
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# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	  else if [ -x /bin/bash ]; then echo /bin/bash; \
	  else echo sh; fi ; fi)

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HOSTCC       = gcc
HOSTCXX      = g++
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HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
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HOSTCXXFLAGS = -O2
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ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
		-Wno-missing-field-initializers -fno-delete-null-pointer-checks
endif

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# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.
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KBUILD_MODULES :=
KBUILD_BUILTIN := 1

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# 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.
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ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

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# 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
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ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  KBUILD_MODULES := 1
endif

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
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: ;
include scripts/Kbuild.include
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# Make variables (CC, etc...)
AS		= $(CROSS_COMPILE)as
LD		= $(CROSS_COMPILE)ld
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
AWK		= awk
GENKSYMS	= scripts/genksyms/genksyms
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INSTALLKERNEL  := installkernel
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DEPMOD		= /sbin/depmod
PERL		= perl
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PYTHON		= python
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CHECK		= sparse

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CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void $(CF)
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CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
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CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
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CFLAGS_GCOV	= -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
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CFLAGS_KCOV	:= $(call cc-option,-fsanitize-coverage=trace-pc,)
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# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include/uapi \
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		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
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		-I$(srctree)/include/uapi \
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		-I$(objtree)/include/generated/uapi \
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                -include $(srctree)/include/linux/kconfig.h

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# Use LINUXINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
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LINUXINCLUDE    := \
		-I$(srctree)/arch/$(hdr-arch)/include \
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		-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
		-I$(objtree)/arch/$(hdr-arch)/include/generated \
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		$(if $(KBUILD_SRC), -I$(srctree)/include) \
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		-I$(objtree)/include
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LINUXINCLUDE	+= $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
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KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common \
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		   -Werror-implicit-function-declaration \
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		   -Wno-format-security \
		   -std=gnu89
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KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
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KBUILD_AFLAGS   := -D__ASSEMBLY__
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KBUILD_AFLAGS_MODULE  := -DMODULE
KBUILD_CFLAGS_MODULE  := -DMODULE
KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
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# Read KERNELRELEASE from include/config/kernel.release (if it exists)
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
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export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
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export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
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export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
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export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
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export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
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export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
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export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
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export KBUILD_ARFLAGS
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# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

# Files to ignore in find ... statements

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export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
			  -prune -o
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export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
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# ===========================================================================
# Rules shared between *config targets and build targets

# Basic helpers built in scripts/
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PHONY += scripts_basic
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scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
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	$(Q)rm -f .tmp_quiet_recordmcount
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# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

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PHONY += outputmakefile
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# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
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outputmakefile:
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ifneq ($(KBUILD_SRC),)
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	$(Q)ln -fsn $(srctree) source
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	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif
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# Support for using generic headers in asm-generic
PHONY += asm-generic
asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
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	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
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# To make sure we do not include .config for any of the *config targets
# 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.
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# For example 'make oldconfig all'.
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# Detect when mixed targets is specified, and make a second invocation
# 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
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,$(MAKECMDGOALS)),)
                config-targets := 1
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                ifneq ($(words $(MAKECMDGOALS)),1)
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                        mixed-targets := 1
                endif
        endif
endif
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# install and module_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
	        mixed-targets := 1
        endif
endif
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ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

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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
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else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
# KBUILD_DEFCONFIG may point out an alternative default configuration
# used for 'make defconfig'
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include arch/$(SRCARCH)/Makefile
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export KBUILD_DEFCONFIG KBUILD_KCONFIG
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config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
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	$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

ifeq ($(KBUILD_EXTMOD),)
# Additional helpers built in scripts/
# Carefully list dependencies so we do not try to build scripts twice
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# in parallel
554
PHONY += scripts
555
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
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	 asm-generic gcc-plugins
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	$(Q)$(MAKE) $(build)=$(@)

# Objects we will link into vmlinux / subdirs we need to visit
init-y		:= init/
561
drivers-y	:= drivers/ sound/ firmware/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
565
virt-y		:= virt/
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endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
569 570
# Read in config
-include include/config/auto.conf
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572
ifeq ($(KBUILD_EXTMOD),)
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# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
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-include include/config/auto.conf.cmd
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# To avoid any implicit rule to kick in, define an empty command
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$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
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# If .config is newer than include/config/auto.conf, someone tinkered
581
# with it and forgot to run make oldconfig.
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# if auto.conf.cmd is missing then we are probably in a cleaned tree so
583
# we execute the config step to be sure to catch updated Kconfig files
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include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
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	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
586
else
587
# external modules needs include/generated/autoconf.h and include/config/auto.conf
588 589 590 591
# but do not care if they are up-to-date. Use auto.conf to trigger the test
PHONY += include/config/auto.conf

include/config/auto.conf:
592
	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
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	echo >&2;							\
	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
	echo >&2 ;							\
598 599 600
	/bin/false)

endif # KBUILD_EXTMOD
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else
# Dummy target needed, because used as prerequisite
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include/config/auto.conf: ;
605
endif # $(dot-config)
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# The all: target is the default when no target is given on the
# command line.
# This allow a user to issue only 'make' to build a kernel including modules
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# Defaults to vmlinux, but the arch makefile usually adds further targets
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all: vmlinux

613 614 615 616 617
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
# values of the respective KBUILD_* variables
ARCH_CPPFLAGS :=
ARCH_AFLAGS :=
ARCH_CFLAGS :=
618
include arch/$(SRCARCH)/Makefile
619 620 621

KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
623
KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
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else
625 626 627 628 629
ifdef CONFIG_PROFILE_ALL_BRANCHES
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
else
KBUILD_CFLAGS   += -O2
endif
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endif

632 633 634
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

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PHONY += gcc-plugins
gcc-plugins: scripts_basic
ifdef CONFIG_GCC_PLUGINS
	$(Q)$(MAKE) $(build)=scripts/gcc-plugins
endif
	@:

include scripts/Makefile.gcc-plugins

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ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
# ipa clone creates specialized cloned functions
# partial inlining inlines only parts of functions
KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
                 $(call cc-option,-fno-ipa-cp-clone,) \
                 $(call cc-option,-fno-partial-inlining)
endif

654
ifneq ($(CONFIG_FRAME_WARN),0)
655 656 657
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

658
# Handle stack protector mode.
659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
#
# Since kbuild can potentially perform two passes (first with the old
# .config values and then with updated .config values), we cannot error out
# if a desired compiler option is unsupported. If we were to error, kbuild
# could never get to the second pass and actually notice that we changed
# the option to something that was supported.
#
# Additionally, we don't want to fallback and/or silently change which compiler
# flags will be used, since that leads to producing kernels with different
# security feature characteristics depending on the compiler used. ("But I
# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
#
# The middle ground is to warn here so that the failed option is obvious, but
# to let the build fail with bad compiler flags so that we can't produce a
# kernel when there is a CONFIG and compiler mismatch.
#
675
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
676 677
  stackp-flag := -fstack-protector
  ifeq ($(call cc-option, $(stackp-flag)),)
678
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
679
             -fstack-protector not supported by compiler)
680
  endif
681 682
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
683 684 685 686 687
  stackp-flag := -fstack-protector-strong
  ifeq ($(call cc-option, $(stackp-flag)),)
    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
	      -fstack-protector-strong not supported by compiler)
  endif
688 689 690
else
  # Force off for distro compilers that enable stack protector by default.
  stackp-flag := $(call cc-option, -fno-stack-protector)
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endif
692
endif
693
KBUILD_CFLAGS += $(stackp-flag)
694

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ifeq ($(cc-name),clang)
696 697 698 699 700 701 702 703 704 705 706
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
# Quiet clang warning: comparison of unsigned expression < 0 is always false
KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
# source of a reference will be _MergedGlobals and not on of the whitelisted names.
# See modpost pattern 2
KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
707
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
708 709
else

710 711
# These warnings generated too much noise in a regular build.
# Use make W=1 to enable them (see scripts/Makefile.build)
712
KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
713
KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
714
endif
715

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ifdef CONFIG_FRAME_POINTER
717
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
719 720 721 722 723 724
# Some targets (ARM with Thumb2, for example), can't be built with frame
# pointers.  For those, we don't have FUNCTION_TRACER automatically
# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
# incompatible with -fomit-frame-pointer with current GCC, so we don't use
# -fomit-frame-pointer with FUNCTION_TRACER.
ifndef CONFIG_FUNCTION_TRACER
725
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
727
endif
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729 730
KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)

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ifdef CONFIG_DEBUG_INFO
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ifdef CONFIG_DEBUG_INFO_SPLIT
KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
else
735
KBUILD_CFLAGS	+= -g
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endif
737
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
739 740 741
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
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743
ifdef CONFIG_DEBUG_INFO_REDUCED
744 745
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
746 747
endif

748
ifdef CONFIG_FUNCTION_TRACER
749 750 751 752
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
export CC_FLAGS_FTRACE
753 754 755
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
endif
756
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
757
KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
758
ifdef CONFIG_DYNAMIC_FTRACE
759
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
760 761 762 763
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
764 765
endif

766 767 768 769 770
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

771
# arch Makefile may override CC so keep this after arch Makefile is included
772
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
773 774
CHECKFLAGS     += $(NOSTDINC_FLAGS)

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# warn about C99 declaration after statement
776
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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# disable pointer signed / unsigned warnings in gcc 4.0
779
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
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781
# disable invalid "can't wrap" optimizations for signed / pointers
782
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
783

784 785 786
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

787 788 789 790 791 792
# disallow errors like 'EXPORT_GPL(foo);' with missing header
KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)

# require functions to have arguments in prototypes, not empty 'int foo()'
KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)

793 794 795
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

796 797 798
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

799 800 801
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

802 803 804
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
805
	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
806 807
endif

808 809
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
810
include scripts/Makefile.ubsan
811

812 813 814 815 816
# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
# last assignments
KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
817

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# Use --build-id when available.
LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
820
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
821
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
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LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

824
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
825
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
826 827
endif

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# Default kernel image to build when no specific target is given.
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829
# KBUILD_IMAGE may be overruled on the command line or
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# set in the environment
# Also any assignments in arch/$(ARCH)/Makefile take precedence over
# this default value
export KBUILD_IMAGE ?= vmlinux

#
# INSTALL_PATH specifies where to place the updated kernel and system map
# images. Default is /boot, but you can set it to other values
export	INSTALL_PATH ?= /boot

840 841 842 843 844 845 846
#
# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
# an argument if needed. Otherwise it defaults to the kernel install path
#
export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)

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#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
# relocations required by build roots.  This is not defined in the
S
Sam Ravnborg 已提交
850
# makefile but the argument can be passed to make if needed.
L
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851 852
#

853
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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854 855
export MODLIB

856
#
857 858 859 860
# INSTALL_MOD_STRIP, if defined, will cause modules to be
# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
# the default option --strip-debug will be used.  Otherwise,
# INSTALL_MOD_STRIP value will be used as the options to the strip command.
861

862 863
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
864
mod_strip_cmd = $(STRIP) --strip-debug
865
else
866
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
867 868
endif # INSTALL_MOD_STRIP=1
else
869
mod_strip_cmd = true
870 871 872
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

873 874 875 876 877 878 879
# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
# or CONFIG_MODULE_COMPRESS_XZ.

mod_compress_cmd = true
ifdef CONFIG_MODULE_COMPRESS
  ifdef CONFIG_MODULE_COMPRESS_GZIP
880
    mod_compress_cmd = gzip -n -f
881 882
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
883
    mod_compress_cmd = xz -f
884 885 886 887
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

888 889 890
# Select initial ramdisk compression format, default is gzip(1).
# This shall be used by the dracut(8) tool while creating an initramfs image.
#
J
Jan Beulich 已提交
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INITRD_COMPRESS-y                  := gzip
INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
897 898 899
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
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Linus Torvalds 已提交
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901
ifdef CONFIG_MODULE_SIG_ALL
902 903 904
$(eval $(call config_filename,MODULE_SIG_KEY))

mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
905 906 907 908 909 910
else
mod_sign_cmd = true
endif
export mod_sign_cmd


L
Linus Torvalds 已提交
911
ifeq ($(KBUILD_EXTMOD),)
912
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
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913 914 915

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
916
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
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917 918

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
919
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
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920 921 922 923 924 925 926 927

init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
libs-y		:= $(libs-y1) $(libs-y2)
928
virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
L
Linus Torvalds 已提交
929

930
# Externally visible symbols (used by link-vmlinux.sh)
931
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
932
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
933
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
934
export LDFLAGS_vmlinux
935
# used by scripts/pacmage/Makefile
936
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
937

938
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
L
Linus Torvalds 已提交
939

940 941 942 943 944
# Include targets which we want to execute sequentially if the rest of the
# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
# evaluated more than once.
PHONY += vmlinux_prereq
vmlinux_prereq: $(vmlinux-deps) FORCE
945
ifdef CONFIG_HEADERS_CHECK
946
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
M
Mathieu Desnoyers 已提交
947
endif
948 949
ifdef CONFIG_BUILD_DOCSRC
	$(Q)$(MAKE) $(build)=Documentation
J
Jan Kiszka 已提交
950 951 952
endif
ifdef CONFIG_GDB_SCRIPTS
	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
953
endif
954
ifdef CONFIG_TRIM_UNUSED_KSYMS
955
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
956 957
	  "$(MAKE) KBUILD_MODULES=1 -f $(srctree)/Makefile vmlinux_prereq"
endif
958 959 960

# standalone target for easier testing
include/generated/autoksyms.h: FORCE
961
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
962

963 964 965 966
# Final link of vmlinux
      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
quiet_cmd_link-vmlinux = LINK    $@

967
vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
968
	+$(call if_changed,link-vmlinux)
969

970 971 972 973 974
# Build samples along the rest of the kernel
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
endif

975
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
976
# make sure no implicit rule kicks in
977
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
L
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# Handle descending into subdirectories listed in $(vmlinux-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language

985
PHONY += $(vmlinux-dirs)
986
$(vmlinux-dirs): prepare scripts
L
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987 988
	$(Q)$(MAKE) $(build)=$@

989 990 991 992
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

G
Geert Uytterhoeven 已提交
993
# Store (new) KERNELRELEASE string in include/config/kernel.release
R
Roman Zippel 已提交
994
include/config/kernel.release: include/config/auto.conf FORCE
995
	$(call filechk,kernel.release)
996 997


L
Linus Torvalds 已提交
998
# Things we need to do before we recursively start building the kernel
999 1000 1001 1002
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.
L
Linus Torvalds 已提交
1003

1004
# Listed in dependency order
1005
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1006

1007
# prepare3 is used to check if we are building in a separate output directory,
L
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1008 1009
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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1010
prepare3: include/config/kernel.release
L
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1011
ifneq ($(KBUILD_SRC),)
1012
	@$(kecho) '  Using $(srctree) as source for kernel'
R
Roman Zippel 已提交
1013
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
Michal Marek 已提交
1014 1015
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
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1016 1017 1018 1019
		/bin/false; \
	fi;
endif

1020
# prepare2 creates a makefile if using a separate output directory
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prepare2: prepare3 outputmakefile asm-generic
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prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
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                   include/config/auto.conf
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	$(cmd_crmodverdir)
1026 1027
	$(Q)test -e include/generated/autoksyms.h || \
	    touch   include/generated/autoksyms.h
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1029
archprepare: archheaders archscripts prepare1 scripts_basic
1030

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prepare0: archprepare gcc-plugins
1032
	$(Q)$(MAKE) $(build)=.
1033

L
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# All the preparing..
1035 1036
prepare: prepare0 prepare-objtool

1037
ifdef CONFIG_STACK_VALIDATION
1038 1039
  has_libelf := $(call try-run,\
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1040 1041 1042 1043 1044 1045 1046 1047 1048
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
    $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev or elfutils-libelf-devel")
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

1049
PHONY += prepare-objtool
1050
prepare-objtool: $(objtool_target)
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# Generate some files
# ---------------------------------------------------------------------------

# KERNELRELEASE can change from a few different places, meaning version.h
# needs to be updated, so this check is forced on all builds

uts_len := 64
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define filechk_utsrelease.h
	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
	  exit 1;                                                         \
	fi;                                                               \
	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
endef
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define filechk_version.h
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	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
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	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
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endef

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$(version_h): $(srctree)/Makefile FORCE
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	$(call filechk,version.h)
1075
	$(Q)rm -f $(old_version_h)
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1077
include/generated/utsrelease.h: include/config/kernel.release FORCE
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	$(call filechk,utsrelease.h)

1080 1081
PHONY += headerdep
headerdep:
1082 1083
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1084

1085 1086 1087 1088 1089 1090
# ---------------------------------------------------------------------------
# Firmware install
INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
export INSTALL_FW_PATH

PHONY += firmware_install
1091
firmware_install:
1092 1093 1094
	@mkdir -p $(objtree)/firmware
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install

1095 1096 1097
# ---------------------------------------------------------------------------
# Kernel headers

1098 1099
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1100

1101 1102
# If we do an all arch process set dst to asm-$(hdr-arch)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1103

1104 1105 1106
PHONY += archheaders
archheaders:

1107 1108 1109
PHONY += archscripts
archscripts:

1110
PHONY += __headers
1111
__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1112
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1113 1114

PHONY += headers_install_all
1115 1116
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1117

1118
PHONY += headers_install
1119
headers_install: __headers
1120 1121 1122 1123
	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
	  $(error Headers not exportable for the $(SRCARCH) architecture))
	$(Q)$(MAKE) $(hdr-inst)=include/uapi
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1124

1125 1126
PHONY += headers_check_all
headers_check_all: headers_install_all
1127
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1128

1129 1130
PHONY += headers_check
headers_check: headers_install
1131 1132
	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1133

1134 1135 1136 1137 1138 1139 1140
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
	$(Q)$(MAKE) -C tools/testing/selftests run_tests

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kselftest-clean:
	$(Q)$(MAKE) -C tools/testing/selftests clean

1144 1145 1146 1147 1148 1149 1150 1151
PHONY += kselftest-merge
kselftest-merge:
	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
		-m $(objtree)/.config \
		$(srctree)/tools/testing/selftests/*/config
	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig

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# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

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# By default, build modules as well
L
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1159
all: modules
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1161
# Build modules
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#
1163 1164 1165
# A module can be listed more than once in obj-m resulting in
# duplicate lines in modules.order files.  Those are removed
# using awk while concatenating to the final file.
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1167
PHONY += modules
1168
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
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1169
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1170
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1172
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
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1174 1175 1176
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1177
%/modules.builtin: include/config/auto.conf
1178 1179
	$(Q)$(MAKE) $(modbuiltin)=$*

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# Target to prepare building external modules
1182
PHONY += modules_prepare
1183
modules_prepare: prepare scripts
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1184 1185

# Target to install modules
1186
PHONY += modules_install
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modules_install: _modinst_ _modinst_post

1189
PHONY += _modinst_
1190
_modinst_:
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	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1194
	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
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	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1197
		ln -s $(CURDIR) $(MODLIB)/build ; \
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	fi
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	@cp -f $(objtree)/modules.order $(MODLIB)/
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	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1203
# This depmod is only for convenience to give the initial
L
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# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1206
PHONY += _modinst_post
1207
_modinst_post: _modinst_
1208
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1209
	$(call cmd,depmod)
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ifeq ($(CONFIG_MODULE_SIG), y)
PHONY += modules_sign
modules_sign:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
endif

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else # CONFIG_MODULES

# Modules not configured
# ---------------------------------------------------------------------------

1222 1223
PHONY += modules modules_install
modules modules_install:
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	@echo >&2
	@echo >&2 "The present kernel configuration has modules disabled."
	@echo >&2 "Type 'make config' and enable loadable module support."
	@echo >&2 "Then build a kernel with module support enabled."
	@echo >&2
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	@exit 1

endif # CONFIG_MODULES

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules
# make mrproper  Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
CLEAN_DIRS  += $(MODVERDIR)

# Directories & files removed with 'make mrproper'
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MRPROPER_DIRS  += include/config usr/include include/generated          \
1245
		  arch/*/include/generated .tmp_objdiff
1246
MRPROPER_FILES += .config .config.old .version .old_version \
1247
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1248 1249
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
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		  signing_key.x509.signer vmlinux-gdb.py
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# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1256
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
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1258
PHONY += $(clean-dirs) clean archclean vmlinuxclean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1262 1263 1264 1265
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean

clean: archclean vmlinuxclean
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# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)

1273
PHONY += $(mrproper-dirs) mrproper archmrproper
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$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

mrproper: clean archmrproper $(mrproper-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)

# distclean
#
1283
PHONY += distclean
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distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
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		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
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		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1289
		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
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		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
# rpm target kept for backward compatibility
1296
package-dir	:= scripts/package
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1298 1299
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1300
%pkg: include/config/kernel.release FORCE
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	$(Q)$(MAKE) $(build)=$(package-dir) $@
1302
rpm: include/config/kernel.release FORCE
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	$(Q)$(MAKE) $(build)=$(package-dir) $@
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# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------

1309
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1310
boards := $(sort $(notdir $(boards)))
1311 1312
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
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1314
PHONY += help
L
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1315 1316
help:
	@echo  'Cleaning targets:'
1317
	@echo  '  clean		  - Remove most generated files but keep the config and'
1318
	@echo  '                    enough build support to build external modules'
1319
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1320
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
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	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all targets marked with [*]'
	@echo  '* vmlinux	  - Build the bare kernel'
	@echo  '* modules	  - Build all modules'
1329
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1330 1331
	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
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	@echo  '  dir/            - Build all files in dir and below'
1333
	@echo  '  dir/file.[ois]  - Build specified target only'
1334 1335
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1336
	@echo  '  dir/file.ko     - Build module including final link'
1337
	@echo  '  modules_prepare - Set up for building external modules'
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	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1340
	@echo  '  gtags           - Generate GNU GLOBAL index'
1341 1342 1343
	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
	@echo  '  image_name	  - Output the image name (use with make -s)'
1344
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1345
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1346
	 echo  ''
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	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1350
	@echo  '  versioncheck    - Sanity check on version.h usage'
1351
	@echo  '  includecheck    - Check for duplicate included header files'
1352
	@echo  '  export_report   - List the usages of all exported symbols'
1353
	@echo  '  headers_check   - Sanity check on exported headers'
1354 1355 1356
	@echo  '  headerdep       - Detect inclusion cycles in headers'
	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
	@echo  ''
1357 1358 1359 1360
	@echo  'Kernel selftest'
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
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	@echo  '  kselftest-clean - Remove all generated kselftest files'
1362 1363
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existed'
	@echo  '                    .config.'
1364
	@echo  ''
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	@echo  'Kernel packaging:'
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	@$(MAKE) $(build)=$(package-dir) help
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	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
	@echo  ''
1371
	@echo  'Architecture specific targets ($(SRCARCH)):'
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	@$(if $(archhelp),$(archhelp),\
1373
		echo '  No architecture specific help defined for $(SRCARCH)')
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	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1379 1380 1381 1382 1383
	@$(if $(board-dirs), \
		$(foreach b, $(board-dirs), \
		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
		printf "  %-16s - Show all of the above\\n" help-boards; \
		echo '')
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	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1386
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
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	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1388 1389
	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1390
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1391 1392 1393 1394
	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
	@echo  '		1: warnings which may be relevant and do not occur too often'
	@echo  '		2: warnings which occur quite often but may still be relevant'
	@echo  '		3: more obscure warnings, can most likely be ignored'
1395
	@echo  '		Multiple levels can be combined with W=12 or W=123'
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	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


1401 1402 1403 1404
help-board-dirs := $(addprefix help-,$(board-dirs))

help-boards: $(help-board-dirs)

1405
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1406 1407 1408 1409 1410 1411 1412 1413 1414

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(SRCARCH) $*):'
	@$(if $(boards-per-dir), \
		$(foreach b, $(boards-per-dir), \
		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
		echo '')


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# Documentation targets
# ---------------------------------------------------------------------------
%docs: scripts_basic FORCE
1418
	$(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
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	$(Q)$(MAKE) $(build)=Documentation/DocBook $@

else # KBUILD_EXTMOD

###
# External module support.
# When building external modules the kernel used as basis is considered
# read-only, and no consistency checks are made and the make
# system is not used on the basis kernel. If updates are required
# in the basis kernel ordinary make commands (without M=...) must
# be used.
#
# The following are the only valid targets when building external
# modules.
# make M=dir clean     Delete all automatically generated files
# make M=dir modules   Make all modules in specified dir
# make M=dir	       Same as 'make M=dir modules'
# make M=dir modules_install
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#                      Install the modules built in the module directory
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#                      Assumes install directory is already created

# We are always building modules
KBUILD_MODULES := 1
1442
PHONY += crmodverdir
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crmodverdir:
S
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1444
	$(cmd_crmodverdir)
L
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1445

1446
PHONY += $(objtree)/Module.symvers
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$(objtree)/Module.symvers:
	@test -e $(objtree)/Module.symvers || ( \
	echo; \
	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
	echo "           is missing; modules will have no dependencies and modversions."; \
	echo )

module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1455
PHONY += $(module-dirs) modules
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$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1460
	@$(kecho) '  Building modules, stage 2.';
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1461
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1463
PHONY += modules_install
1464
modules_install: _emodinst_ _emodinst_post
1465

1466 1467
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1468 1469
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1472
PHONY += _emodinst_post
1473 1474 1475
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))

1478
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1483
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1485
PHONY += help
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help:
	@echo  '  Building external modules.'
	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
	@echo  ''
	@echo  '  modules         - default target, build the module(s)'
	@echo  '  modules_install - install the module'
	@echo  '  clean           - remove generated files in module directory only'
	@echo  ''
1494 1495

# Dummies...
1496
PHONY += prepare scripts
1497 1498
prepare: ;
scripts: ;
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endif # KBUILD_EXTMOD

1501 1502 1503
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1504
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1505
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1506
		-o -name '*.ko.*' \
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		-o -name '*.dwo'  \
1508
		-o -name '*.su'  \
1509 1510 1511
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
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		-o -name '*.c.[012]*.*' \
1513 1514
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1517 1518
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1520
tags TAGS cscope gtags: FORCE
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	$(call cmd,tags)

# Scripts to check various things for consistency
# ---------------------------------------------------------------------------

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PHONY += includecheck versioncheck coccicheck namespacecheck export_report

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includecheck:
1529
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1531
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1534
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1536
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1538 1539 1540
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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namespacecheck:
	$(PERL) $(srctree)/scripts/namespace.pl

1544 1545 1546
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

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endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

1550
PHONY += checkstack kernelrelease kernelversion image_name
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# UML needs a little special treatment here.  It wants to use the host
# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
# else wants $(ARCH), including people doing cross-builds, which means
# that $(SUBARCH) doesn't work here.
ifeq ($(ARCH), um)
CHECKSTACK_ARCH := $(SUBARCH)
else
CHECKSTACK_ARCH := $(ARCH)
endif
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checkstack:
	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
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	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1565 1566
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1567

1568
kernelversion:
1569
	@echo $(KERNELVERSION)
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1571 1572 1573
image_name:
	@echo $(KBUILD_IMAGE)

1574 1575
# Clear a bunch of variables before executing the submake
tools/: FORCE
1576
	$(Q)mkdir -p $(objtree)/tools
1577
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1578 1579

tools/%: FORCE
1580
	$(Q)mkdir -p $(objtree)/tools
1581
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1582

1583 1584
# Single targets
# ---------------------------------------------------------------------------
1585
# Single targets are compatible with:
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# - build with mixed source and output
1587 1588 1589 1590 1591 1592 1593
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
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        build-dir  = $(patsubst %/,%,$(dir $@))
1595 1596 1597 1598 1599 1600 1601
        target-dir = $(dir $@)
else
        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

1602
%.s: %.c prepare scripts FORCE
1603
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1604
%.i: %.c prepare scripts FORCE
1605
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1606
%.o: %.c prepare scripts FORCE
1607
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1608
%.lst: %.c prepare scripts FORCE
1609
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1610
%.s: %.S prepare scripts FORCE
1611
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1612
%.o: %.S prepare scripts FORCE
1613
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1614 1615
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1616

1617
# Modules
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/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
1622 1623
# Make sure the latest headers are built for Documentation
Documentation/: headers_install
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%/: prepare scripts FORCE
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Sam Ravnborg 已提交
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	$(cmd_crmodverdir)
1626
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1627 1628
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
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Sam Ravnborg 已提交
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	$(cmd_crmodverdir)
1630
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1631
	$(build)=$(build-dir) $(@:.ko=.o)
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Sam Ravnborg 已提交
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1633

1634
# FIXME Should go into a make.lib or something
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# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)

1643
# Run depmod only if we have System.map and depmod is executable
1644
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
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                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1647

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# Create temporary dir for module support files
1649 1650 1651
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
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Linus Torvalds 已提交
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# read all saved command lines

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  $(cmd_files): ;	# Do not try to update included dependency files
  include $(cmd_files)
endif

endif	# skip-makefile

1665
PHONY += FORCE
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FORCE:
1667 1668

# Declare the contents of the .PHONY variable as phony.  We keep that
1669
# information in a variable so we can use it in if_changed and friends.
1670
.PHONY: $(PHONY)