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# SPDX-License-Identifier: GPL-2.0
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VERSION = 4
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PATCHLEVEL = 15
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SUBLEVEL = 0
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EXTRAVERSION =
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NAME = Fearless Coyote
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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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# That's our default target when none is given on the command line
PHONY := _all
_all:

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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

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ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
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  quiet=silent_
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  tools_silent=s
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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.

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# KBUILD_SRC is not intended to be used by the regular user (for now),
# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
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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

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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),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
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KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
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								&& pwd)
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$(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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# Invoke a second make in the output directory, passing relevant variables
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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.
#
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# See the file "Documentation/dev-tools/sparse.rst" for more details,
# including where to get the "sparse" utility.
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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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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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export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC

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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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# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

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

no-dot-config-targets := clean mrproper distclean \
			 cscope gtags TAGS tags help% %docs check% coccicheck \
			 $(version_h) headers_% archheaders archscripts \
			 kernelversion %src-pkg

config-targets := 0
mixed-targets  := 0
dot-config     := 1

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
		dot-config := 0
	endif
endif

ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(words $(MAKECMDGOALS)),1)
                        mixed-targets := 1
                endif
        endif
endif
# install and modules_install need also be processed one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
	        mixed-targets := 1
        endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

PHONY += $(MAKECMDGOALS) __build_one_by_one

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

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done

else

# We need some generic definitions (do not try to remake the file).
scripts/Kbuild.include: ;
include scripts/Kbuild.include

# Read KERNELRELEASE from include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION

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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/ \
				  -e s/riscv.*/riscv/)
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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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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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HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
HOST_LFS_LIBS := $(shell getconf LFS_LIBS)

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HOSTCC       = gcc
HOSTCXX      = g++
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HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
HOST_LOADLIBES := $(HOST_LFS_LIBS)
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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
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LEX		= flex
YACC		= bison
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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 $(CF)
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NOSTDINC_FLAGS  =
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CFLAGS_MODULE   =
AFLAGS_MODULE   =
LDFLAGS_MODULE  =
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CFLAGS_KERNEL	=
AFLAGS_KERNEL	=
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LDFLAGS_vmlinux =
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# Use USERINCLUDE when you must reference the UAPI directories only.
USERINCLUDE    := \
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		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
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		-I$(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    := \
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		-I$(srctree)/arch/$(SRCARCH)/include \
		-I$(objtree)/arch/$(SRCARCH)/include/generated \
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		$(if $(KBUILD_SRC), -I$(srctree)/include) \
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		-I$(objtree)/include \
		$(USERINCLUDE)
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KBUILD_AFLAGS   := -D__ASSEMBLY__
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KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
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		   -fno-strict-aliasing -fno-common -fshort-wchar \
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		   -Werror-implicit-function-declaration \
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		   -Wno-format-security \
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		   -std=gnu89
KBUILD_CPPFLAGS := -D__KERNEL__
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KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL :=
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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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GCC_PLUGINS_CFLAGS :=
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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 LEX YACC 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
export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE 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

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# Basic helpers built in scripts/basic/
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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) $(PATCHLEVEL)
endif
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ifeq ($(cc-name),clang)
ifneq ($(CROSS_COMPILE),)
CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
endif
ifneq ($(GCC_TOOLCHAIN),)
CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
endif
KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
endif

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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.

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

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

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.

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

# If we have "make <whatever> modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well

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

ifeq ($(MAKECMDGOALS),)
  KBUILD_MODULES := 1
endif

export KBUILD_MODULES KBUILD_BUILTIN

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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
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PHONY += scripts
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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/
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drivers-y	:= drivers/ sound/ firmware/
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net-y		:= net/
libs-y		:= lib/
core-y		:= usr/
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virt-y		:= virt/
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endif # KBUILD_EXTMOD

ifeq ($(dot-config),1)
571 572
# Read in config
-include include/config/auto.conf
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574
ifeq ($(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
583
# 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
585
# 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
588
else
589
# external modules needs include/generated/autoconf.h and include/config/auto.conf
590 591 592 593
# 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:
594
	$(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 ;							\
600 601 602
	/bin/false)

endif # KBUILD_EXTMOD
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else
# Dummy target needed, because used as prerequisite
R
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include/config/auto.conf: ;
607
endif # $(dot-config)
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609 610 611 612 613 614 615
# For the kernel to actually contain only the needed exported symbols,
# we have to build modules as well to determine what those symbols are.
# (this can be evaluated only once include/config/auto.conf has been included)
ifdef CONFIG_TRIM_UNUSED_KSYMS
  KBUILD_MODULES := 1
endif

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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

622 623 624 625 626
KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
export CFLAGS_GCOV CFLAGS_KCOV

627 628 629 630 631
# 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 :=
632
include arch/$(SRCARCH)/Makefile
633 634

KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
635
KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
636 637 638
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
639

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ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
641 642
KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
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else
644
ifdef CONFIG_PROFILE_ALL_BRANCHES
645
KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
646 647 648
else
KBUILD_CFLAGS   += -O2
endif
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endif

651 652 653
KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
			$(call cc-disable-warning,maybe-uninitialized,))

654 655 656
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)

657
# check for 'asm goto'
658
ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
659 660 661 662
	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
endif

663
include scripts/Makefile.kcov
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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

676
ifneq ($(CONFIG_FRAME_WARN),0)
677 678 679
KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif

680 681 682
# This selects the stack protector compiler flag. Testing it is delayed
# until after .config has been reprocessed, in the prepare-compiler-check
# target.
683 684 685 686
ifdef CONFIG_CC_STACKPROTECTOR_AUTO
  stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
  stackp-name := AUTO
else
687
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
688
  stackp-flag := -fstack-protector
689
  stackp-name := REGULAR
690 691
else
ifdef CONFIG_CC_STACKPROTECTOR_STRONG
692
  stackp-flag := -fstack-protector-strong
693
  stackp-name := STRONG
694
else
695 696 697 698
  # If either there is no stack protector for this architecture or
  # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
  # is empty, skipping all remaining stack protector tests.
  #
699
  # Force off for distro compilers that enable stack protector by default.
700 701
  KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
endif
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endif
703
endif
704
# Find arch-specific stack protector compiler sanity-checking script.
705
ifdef stackp-name
706
ifneq ($(stackp-flag),)
707 708
  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
  stackp-check := $(wildcard $(stackp-path))
709 710 711 712 713 714
  # If the wildcard test matches a test script, run it to check functionality.
  ifdef stackp-check
    ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
      stackp-broken := y
    endif
  endif
715 716 717
  ifndef stackp-broken
    # If the stack protector is functional, enable code that depends on it.
    KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
718 719 720 721 722 723 724 725
    # Either we've already detected the flag (for AUTO) or we'll fail the
    # build in the prepare-compiler-check rule (for specific flag).
    KBUILD_CFLAGS += $(stackp-flag)
  else
    # We have to make sure stack protector is unconditionally disabled if
    # the compiler is broken (in case we're going to continue the build in
    # AUTO mode).
    KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
726
  endif
727
endif
728
endif
729

730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
# 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,)
KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
else

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

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ifdef CONFIG_FRAME_POINTER
754
KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
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else
756 757 758 759 760 761
# 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
762
KBUILD_CFLAGS	+= -fomit-frame-pointer
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endif
764
endif
L
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766 767
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
772
KBUILD_CFLAGS	+= -g
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endif
774
KBUILD_AFLAGS	+= -Wa,-gdwarf-2
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endif
776 777 778
ifdef CONFIG_DEBUG_INFO_DWARF4
KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
endif
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780
ifdef CONFIG_DEBUG_INFO_REDUCED
781 782
KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
		   $(call cc-option,-fno-var-tracking)
783 784
endif

785
ifdef CONFIG_FUNCTION_TRACER
786 787 788 789
ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg
endif
export CC_FLAGS_FTRACE
790 791 792
ifdef CONFIG_HAVE_FENTRY
CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
endif
793
KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
794
KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
795
ifdef CONFIG_DYNAMIC_FTRACE
796
	ifdef CONFIG_HAVE_C_RECORDMCOUNT
797 798 799 800
		BUILD_C_RECORDMCOUNT := y
		export BUILD_C_RECORDMCOUNT
	endif
endif
801 802
endif

803 804 805 806 807
# We trigger additional mismatches with less inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH
KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
endif

808 809 810 811 812
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
endif

813
# arch Makefile may override CC so keep this after arch Makefile is included
814
NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
815 816
CHECKFLAGS     += $(NOSTDINC_FLAGS)

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# warn about C99 declaration after statement
818
KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
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# disable pointer signed / unsigned warnings in gcc 4.0
821
KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
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823
# disable invalid "can't wrap" optimizations for signed / pointers
824
KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
825

826 827 828
# Make sure -fstack-check isn't enabled (like gentoo apparently did)
KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)

829 830 831
# conserve stack if available
KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)

832 833 834 835 836 837
# 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)

838 839 840
# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

841 842 843
# enforce correct pointer usage
KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)

844 845 846
# Require designated initializers for all marked structures
KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)

847 848 849
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D)

850 851
include scripts/Makefile.kasan
include scripts/Makefile.extrawarn
852
include scripts/Makefile.ubsan
853

854 855 856 857 858
# 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)
859

R
Roland McGrath 已提交
860
# Use --build-id when available.
861
LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
862
			      $(call cc-ldoption, -Wl$(comma)--build-id,))
863
KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
R
Roland McGrath 已提交
864 865
LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)

866 867 868 869
ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
endif

870
ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
871
LDFLAGS_vmlinux	+= $(call ld-option, -X,)
872 873
endif

L
Linus Torvalds 已提交
874
# Default kernel image to build when no specific target is given.
S
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875
# KBUILD_IMAGE may be overruled on the command line or
L
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876 877 878 879 880 881 882 883 884 885
# 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

886 887 888 889 890 891 892
#
# 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
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896
# makefile but the argument can be passed to make if needed.
L
Linus Torvalds 已提交
897 898
#

899
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
L
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900 901
export MODLIB

902
#
903 904 905 906
# 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.
907

908 909
ifdef INSTALL_MOD_STRIP
ifeq ($(INSTALL_MOD_STRIP),1)
910
mod_strip_cmd = $(STRIP) --strip-debug
911
else
912
mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
913 914
endif # INSTALL_MOD_STRIP=1
else
915
mod_strip_cmd = true
916 917 918
endif # INSTALL_MOD_STRIP
export mod_strip_cmd

919 920 921 922 923 924 925
# 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
926
    mod_compress_cmd = gzip -n -f
927 928
  endif # CONFIG_MODULE_COMPRESS_GZIP
  ifdef CONFIG_MODULE_COMPRESS_XZ
929
    mod_compress_cmd = xz -f
930 931 932 933
  endif # CONFIG_MODULE_COMPRESS_XZ
endif # CONFIG_MODULE_COMPRESS
export mod_compress_cmd

934 935 936
# 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
937 938 939 940 941 942
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
943 944 945
# do not export INITRD_COMPRESS, since we didn't actually
# choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
L
Linus Torvalds 已提交
946

947
ifdef CONFIG_MODULE_SIG_ALL
948 949 950
$(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
951 952 953 954 955
else
mod_sign_cmd = true
endif
export mod_sign_cmd

956 957 958 959 960 961
ifdef CONFIG_STACK_VALIDATION
  has_libelf := $(call try-run,\
		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
  ifeq ($(has_libelf),1)
    objtool_target := tools/objtool FORCE
  else
962 963
    ifdef CONFIG_UNWINDER_ORC
      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
964 965 966
    else
      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
    endif
967 968 969 970 971
    SKIP_STACK_VALIDATION := 1
    export SKIP_STACK_VALIDATION
  endif
endif

972

L
Linus Torvalds 已提交
973
ifeq ($(KBUILD_EXTMOD),)
974
core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
L
Linus Torvalds 已提交
975 976 977

vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
978
		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
L
Linus Torvalds 已提交
979 980

vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
981
		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
L
Linus Torvalds 已提交
982 983 984 985 986 987

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))
988
libs-y2		:= $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
989
virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
L
Linus Torvalds 已提交
990

991
# Externally visible symbols (used by link-vmlinux.sh)
992
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
993 994
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
export KBUILD_VMLINUX_LIBS := $(libs-y1)
995
export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
996
export LDFLAGS_vmlinux
997
# used by scripts/package/Makefile
998
export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
999

1000
vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
L
Linus Torvalds 已提交
1001

1002 1003 1004 1005 1006
# 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
1007
ifdef CONFIG_HEADERS_CHECK
1008
	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
M
Mathieu Desnoyers 已提交
1009
endif
J
Jan Kiszka 已提交
1010
ifdef CONFIG_GDB_SCRIPTS
1011
	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1012
endif
1013
ifdef CONFIG_TRIM_UNUSED_KSYMS
1014
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1015
	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1016
endif
1017 1018 1019

# standalone target for easier testing
include/generated/autoksyms.h: FORCE
1020
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1021

1022 1023 1024
ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)

# Final link of vmlinux with optional arch pass after final link
1025 1026
cmd_link-vmlinux =                                                 \
	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1027
	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1028

1029
vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1030
	+$(call if_changed,link-vmlinux)
1031

1032 1033 1034 1035 1036
# Build samples along the rest of the kernel
ifdef CONFIG_SAMPLES
vmlinux-dirs += samples
endif

1037
# The actual objects are generated when descending,
L
Linus Torvalds 已提交
1038
# make sure no implicit rule kicks in
1039
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
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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

1047
PHONY += $(vmlinux-dirs)
1048
$(vmlinux-dirs): prepare scripts
1049
	$(Q)$(MAKE) $(build)=$@ need-builtin=1
L
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1051 1052 1053 1054
define filechk_kernel.release
	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

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1055
# Store (new) KERNELRELEASE string in include/config/kernel.release
R
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1056
include/config/kernel.release: include/config/auto.conf FORCE
1057
	$(call filechk,kernel.release)
1058 1059


L
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# Things we need to do before we recursively start building the kernel
1061 1062 1063 1064
# 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
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1066
# Listed in dependency order
1067
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1068

1069
# prepare3 is used to check if we are building in a separate output directory,
L
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1070 1071
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
R
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1072
prepare3: include/config/kernel.release
L
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1073
ifneq ($(KBUILD_SRC),)
1074
	@$(kecho) '  Using $(srctree) as source for kernel'
R
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1075
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
M
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1076 1077
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
L
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		/bin/false; \
	fi;
endif

1082 1083 1084 1085
# prepare2 creates a makefile if using a separate output directory.
# From this point forward, .config has been reprocessed, so any rules
# that need to depend on updated CONFIG_* values can be checked here.
prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
L
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D
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1087
prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
S
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1088
                   include/config/auto.conf
S
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1089
	$(cmd_crmodverdir)
L
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1090

1091
archprepare: archheaders archscripts prepare1 scripts_basic
1092

E
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prepare0: archprepare gcc-plugins
1094
	$(Q)$(MAKE) $(build)=.
1095

L
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# All the preparing..
1097 1098
prepare: prepare0 prepare-objtool

1099 1100 1101 1102 1103 1104 1105 1106 1107
# Support for using generic headers in asm-generic
PHONY += asm-generic uapi-asm-generic
asm-generic: uapi-asm-generic
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
uapi-asm-generic:
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm

1108
PHONY += prepare-objtool
1109
prepare-objtool: $(objtool_target)
L
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1110

1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
# Check for CONFIG flags that require compiler support. Abort the build
# after .config has been processed, but before the kernel build starts.
#
# For security-sensitive CONFIG options, 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. (For example, "But I selected
# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
PHONY += prepare-compiler-check
prepare-compiler-check: FORCE
# Make sure compiler supports requested stack protector flag.
ifdef stackp-name
1123 1124 1125 1126 1127 1128
  # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
  ifeq ($(stackp-flag),)
	@echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
		  Compiler does not support any known stack-protector >&2
  else
  # Fail if specifically requested stack protector is missing.
1129 1130 1131 1132
  ifeq ($(call cc-option, $(stackp-flag)),)
	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
		  $(stackp-flag) not supported by compiler >&2 && exit 1
  endif
1133
  endif
1134
endif
1135 1136
# Make sure compiler does not have buggy stack-protector support. If a
# specific stack-protector was requested, fail the build, otherwise warn.
1137
ifdef stackp-broken
1138 1139 1140 1141
  ifeq ($(stackp-name),AUTO)
	@echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
                  $(stackp-flag) available but compiler is broken: disabling >&2
  else
1142 1143
	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1144
  endif
1145 1146 1147
endif
	@:

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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
J
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1164 1165
	(echo \#define LINUX_VERSION_CODE $(shell                         \
	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
S
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	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
L
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endef

D
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1169
$(version_h): $(srctree)/Makefile FORCE
L
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1170
	$(call filechk,version.h)
1171
	$(Q)rm -f $(old_version_h)
L
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1172

1173
include/generated/utsrelease.h: include/config/kernel.release FORCE
S
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1174 1175
	$(call filechk,utsrelease.h)

1176 1177
PHONY += headerdep
headerdep:
1178 1179
	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1180

1181 1182 1183
# ---------------------------------------------------------------------------
# Kernel headers

1184 1185
#Default location for installed headers
export INSTALL_HDR_PATH = $(objtree)/usr
1186

1187 1188
# If we do an all arch process set dst to include/arch-$(SRCARCH)
hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1189

1190 1191 1192
PHONY += archheaders
archheaders:

1193 1194 1195
PHONY += archscripts
archscripts:

1196
PHONY += __headers
1197
__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1198
	$(Q)$(MAKE) $(build)=scripts build_unifdef
1199 1200

PHONY += headers_install_all
1201 1202
headers_install_all:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1203

1204
PHONY += headers_install
1205
headers_install: __headers
1206
	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1207
	  $(error Headers not exportable for the $(SRCARCH) architecture))
1208
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1209
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1210

1211 1212
PHONY += headers_check_all
headers_check_all: headers_install_all
1213
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1214

1215 1216
PHONY += headers_check
headers_check: headers_install
1217
	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1218
	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1219

1220 1221 1222 1223 1224
# ---------------------------------------------------------------------------
# Kernel selftest

PHONY += kselftest
kselftest:
1225
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1226

1227
PHONY += kselftest-clean
W
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1228
kselftest-clean:
1229
	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
W
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1230

1231 1232 1233 1234 1235 1236 1237 1238
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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1239 1240 1241 1242 1243
# ---------------------------------------------------------------------------
# Modules

ifdef CONFIG_MODULES

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# By default, build modules as well
L
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1245

1246
all: modules
L
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1247

1248
# Build modules
T
Tejun Heo 已提交
1249
#
1250 1251 1252
# 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.
L
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1254
PHONY += modules
1255
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
T
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1256
	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1257
	@$(kecho) '  Building modules, stage 2.';
S
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
L
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1259

1260 1261 1262
modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin

1263
%/modules.builtin: include/config/auto.conf
1264 1265
	$(Q)$(MAKE) $(modbuiltin)=$*

L
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1266 1267

# Target to prepare building external modules
1268
PHONY += modules_prepare
1269
modules_prepare: prepare scripts
L
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1270 1271

# Target to install modules
1272
PHONY += modules_install
L
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1273 1274
modules_install: _modinst_ _modinst_post

1275
PHONY += _modinst_
1276
_modinst_:
L
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1277 1278 1279
	@rm -rf $(MODLIB)/kernel
	@rm -f $(MODLIB)/source
	@mkdir -p $(MODLIB)/kernel
1280
	@ln -s $(abspath $(srctree)) $(MODLIB)/source
L
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1281 1282
	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
		rm -f $(MODLIB)/build ; \
1283
		ln -s $(CURDIR) $(MODLIB)/build ; \
L
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1284
	fi
T
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1285
	@cp -f $(objtree)/modules.order $(MODLIB)/
M
Michal Marek 已提交
1286
	@cp -f $(objtree)/modules.builtin $(MODLIB)/
S
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1287
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
L
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1288

1289
# This depmod is only for convenience to give the initial
L
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1290 1291
# boot a modules.dep even before / is mounted read-write.  However the
# boot script depmod is the master version.
1292
PHONY += _modinst_post
1293
_modinst_post: _modinst_
1294
	$(call cmd,depmod)
L
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J
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1296 1297 1298 1299 1300 1301
ifeq ($(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
# ---------------------------------------------------------------------------

1307 1308
PHONY += modules modules_install
modules modules_install:
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1309 1310 1311 1312 1313
	@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
L
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1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328
	@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'
S
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1329
MRPROPER_DIRS  += include/config usr/include include/generated          \
1330
		  arch/*/include/generated .tmp_objdiff
1331
MRPROPER_FILES += .config .config.old .version \
1332
		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1333 1334
		  signing_key.pem signing_key.priv signing_key.x509	\
		  x509.genkey extra_certificates signing_key.x509.keyid	\
J
Jan Kiszka 已提交
1335
		  signing_key.x509.signer vmlinux-gdb.py
L
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1336 1337 1338 1339 1340

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)
1341
clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
L
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1342

1343
PHONY += $(clean-dirs) clean archclean vmlinuxclean
L
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1344 1345 1346
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

1347 1348
vmlinuxclean:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1349
	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1350 1351

clean: archclean vmlinuxclean
L
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1352 1353 1354 1355 1356

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1357
mrproper-dirs      := $(addprefix _mrproper_,scripts)
L
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1358

1359
PHONY += $(mrproper-dirs) mrproper archmrproper
L
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1360 1361 1362 1363 1364 1365 1366 1367 1368
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

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

# distclean
#
1369
PHONY += distclean
L
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1370 1371 1372

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
S
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1373
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1374 1375
		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
		-o -name 'core' \) \
L
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1376 1377 1378 1379 1380 1381
		-type f -print | xargs rm -f


# Packaging of the kernel to various formats
# ---------------------------------------------------------------------------
# rpm target kept for backward compatibility
1382
package-dir	:= scripts/package
L
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1383

1384 1385
%src-pkg: FORCE
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1386
%pkg: include/config/kernel.release FORCE
S
Sam Ravnborg 已提交
1387
	$(Q)$(MAKE) $(build)=$(package-dir) $@
1388 1389 1390
rpm: rpm-pkg
	@echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
	@echo "           Please use \"rpm-pkg\" instead."
L
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1391 1392 1393 1394 1395


# Brief documentation of the typical targets used
# ---------------------------------------------------------------------------

1396
boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1397
boards := $(sort $(notdir $(boards)))
1398 1399
board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
board-dirs := $(sort $(notdir $(board-dirs:/=)))
L
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1400

1401
PHONY += help
L
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1402 1403
help:
	@echo  'Cleaning targets:'
1404
	@echo  '  clean		  - Remove most generated files but keep the config and'
1405
	@echo  '                    enough build support to build external modules'
1406
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1407
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
L
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1408 1409 1410 1411 1412 1413 1414 1415
	@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'
1416
	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
L
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1417
	@echo  '  dir/            - Build all files in dir and below'
1418
	@echo  '  dir/file.[ois]  - Build specified target only'
1419 1420
	@echo  '  dir/file.ll     - Build the LLVM assembly file'
	@echo  '                    (requires compiler support for LLVM assembly generation)'
1421 1422
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
1423
	@echo  '  dir/file.ko     - Build module including final link'
1424
	@echo  '  modules_prepare - Set up for building external modules'
L
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1425 1426
	@echo  '  tags/TAGS	  - Generate tags file for editors'
	@echo  '  cscope	  - Generate cscope index'
1427
	@echo  '  gtags           - Generate GNU GLOBAL index'
1428 1429 1430
	@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)'
1431
	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1432
	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1433
	 echo  ''
R
Randy Dunlap 已提交
1434
	@echo  'Static analysers:'
L
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1435 1436
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1437
	@echo  '  versioncheck    - Sanity check on version.h usage'
1438
	@echo  '  includecheck    - Check for duplicate included header files'
1439
	@echo  '  export_report   - List the usages of all exported symbols'
1440
	@echo  '  headers_check   - Sanity check on exported headers'
1441
	@echo  '  headerdep       - Detect inclusion cycles in headers'
1442
	@echo  '  coccicheck      - Check with Coccinelle'
1443
	@echo  ''
R
Randy Dunlap 已提交
1444
	@echo  'Kernel selftest:'
1445 1446 1447
	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
	@echo  '                    Build, install, and boot kernel before'
	@echo  '                    running kselftest on it'
W
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1448
	@echo  '  kselftest-clean - Remove all generated kselftest files'
1449
	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1450
	@echo  '                    .config.'
1451
	@echo  ''
R
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1452 1453 1454 1455
	@echo 'Userspace tools targets:'
	@echo '  use "make tools/help"'
	@echo '  or  "cd tools; make help"'
	@echo  ''
L
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1456
	@echo  'Kernel packaging:'
S
Sam Ravnborg 已提交
1457
	@$(MAKE) $(build)=$(package-dir) help
L
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1458 1459
	@echo  ''
	@echo  'Documentation targets:'
1460
	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
L
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1461
	@echo  ''
1462
	@echo  'Architecture specific targets ($(SRCARCH)):'
L
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1463
	@$(if $(archhelp),$(archhelp),\
1464
		echo '  No architecture specific help defined for $(SRCARCH)')
L
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1465 1466 1467 1468 1469
	@echo  ''
	@$(if $(boards), \
		$(foreach b, $(boards), \
		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
		echo '')
1470 1471 1472 1473 1474
	@$(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 '')
L
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1475 1476

	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1477
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
L
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1478
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
C
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1479
	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1480
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1481
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1482 1483 1484 1485
	@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'
1486
	@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'


1492 1493 1494 1495
help-board-dirs := $(addprefix help-,$(board-dirs))

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

1496
boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1497 1498 1499 1500 1501 1502 1503 1504 1505

$(help-board-dirs): help-%:
	@echo  'Architecture specific targets ($(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
# ---------------------------------------------------------------------------
1508 1509
DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
	       linkcheckdocs dochelp refcheckdocs
1510 1511
PHONY += $(DOC_TARGETS)
$(DOC_TARGETS): scripts_basic FORCE
1512
	$(Q)$(MAKE) $(build)=Documentation $@
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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
1535
PHONY += crmodverdir
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crmodverdir:
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	$(cmd_crmodverdir)
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1539
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))
1548
PHONY += $(module-dirs) modules
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$(module-dirs): crmodverdir $(objtree)/Module.symvers
	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)

modules: $(module-dirs)
1553
	@$(kecho) '  Building modules, stage 2.';
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
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1556
PHONY += modules_install
1557
modules_install: _emodinst_ _emodinst_post
1558

1559 1560
install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
PHONY += _emodinst_
1561 1562
_emodinst_:
	$(Q)mkdir -p $(MODLIB)/$(install-dir)
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	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
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1565
PHONY += _emodinst_post
1566 1567 1568
_emodinst_post: _emodinst_
	$(call cmd,depmod)

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

1571
PHONY += $(clean-dirs) clean
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$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

clean:	rm-dirs := $(MODVERDIR)
1576
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
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1578
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  ''
1587 1588

# Dummies...
1589
PHONY += prepare scripts
1590 1591
prepare: ;
scripts: ;
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endif # KBUILD_EXTMOD

1594 1595 1596
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
1597
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1598
		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1599
		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1600
		-o -name '*.dwo' -o -name '*.lst' \
1601
		-o -name '*.su'  \
1602 1603 1604
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1605
		-o -name .cache.mk \
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		-o -name '*.c.[012]*.*' \
1607
		-o -name '*.ll' \
1608 1609
		-o -name '*.gcno' \) -type f -print | xargs rm -f

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# Generate tags for editors
# ---------------------------------------------------------------------------
1612 1613
quiet_cmd_tags = GEN     $@
      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
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1615
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:
1624
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1626
		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
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versioncheck:
1629
	find $(srctree)/* $(RCS_FIND_IGNORE) \
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		-name '*.[hcS]' -type f -print | sort \
1631
		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
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1633 1634 1635
coccicheck:
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@

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

1639 1640 1641
export_report:
	$(PERL) $(srctree)/scripts/export_report.pl

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

1645
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 $$(find . -name '*.ko') | \
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	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
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1660 1661
kernelrelease:
	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1662

1663
kernelversion:
1664
	@echo $(KERNELVERSION)
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1666 1667 1668
image_name:
	@echo $(KBUILD_IMAGE)

1669 1670
# Clear a bunch of variables before executing the submake
tools/: FORCE
1671
	$(Q)mkdir -p $(objtree)/tools
1672
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1673 1674

tools/%: FORCE
1675
	$(Q)mkdir -p $(objtree)/tools
1676
	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1677

1678 1679
# Single targets
# ---------------------------------------------------------------------------
1680
# Single targets are compatible with:
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# - build with mixed source and output
1682 1683 1684 1685 1686 1687 1688
# - 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 $@))
1690 1691 1692 1693 1694 1695 1696
        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

1697
%.s: %.c prepare scripts FORCE
1698
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1699
%.i: %.c prepare scripts FORCE
1700
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1701
%.o: %.c prepare scripts FORCE
1702
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1703
%.lst: %.c prepare scripts FORCE
1704
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1705
%.s: %.S prepare scripts FORCE
1706
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1707
%.o: %.S prepare scripts FORCE
1708
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709 1710
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711 1712
%.ll: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1713

1714
# Modules
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/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
1719
# Make sure the latest headers are built for Documentation
1720
Documentation/ samples/: headers_install
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1721
%/: prepare scripts FORCE
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1722
	$(cmd_crmodverdir)
1723
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1724 1725
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
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1726
	$(cmd_crmodverdir)
1727
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1728
	$(build)=$(build-dir) $(@:.ko=.o)
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1729
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1730

1731
# 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)

1740
# Run depmod only if we have System.map and depmod is executable
1741
quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
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      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
R
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1743
                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1744

S
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1745
# Create temporary dir for module support files
1746 1747 1748
# clean it up only when building all modules
cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
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1749 1750 1751

# read all saved command lines

1752
cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
L
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1753 1754 1755 1756 1757 1758 1759 1760

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

endif	# skip-makefile

1761
PHONY += FORCE
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1762
FORCE:
1763 1764

# Declare the contents of the .PHONY variable as phony.  We keep that
1765
# information in a variable so we can use it in if_changed and friends.
1766
.PHONY: $(PHONY)