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Makefile
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# SPDX-License-Identifier: GPL-2.0
VERSION = 4 PATCHLEVEL = 14 SUBLEVEL = 159
EXTRAVERSION = NAME = Petit Gorille
# *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. That's our
# default target when none is given on the command
# line
PHONY := _all _all:
# 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)
# Avoid funny character set dependencies
unexport LC_ALL LC_COLLATE=C LC_NUMERIC=C export
LC_COLLATE LC_NUMERIC
# Avoid interference with shell env settings
unexport GREP_OPTIONS
# 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. 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 $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command
# will be hidden. If KBUILD_VERBOSE equals 1 then
# the above command is displayed.
#
# To put more focus on warnings, be less verbose as
# default Use 'make V=1' to see the full commands
ifeq ("$(origin V)", "command line")
KBUILD_VERBOSE = $(V) endif ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0 endif ifeq
($(KBUILD_VERBOSE),1)
quiet =
Q = else
quiet=quiet_
Q = @ endif
# If the user is running make -s (silent mode),
# suppress echoing of commands
ifneq ($(findstring s,$(filter-out
--%,$(MAKEFLAGS))),)
quiet=silent_
tools_silent=s endif export quiet Q KBUILD_VERBOSE
# kbuild supports saving output files in a separate
# directory. To locate output files in a separate
# directory two syntaxes are supported. In both
# cases the working directory must be the root of
# the kernel src. 1) O= Use "make
# O=dir/to/store/output/files/"
#
# 2) Set KBUILD_OUTPUT Set the environment variable
# KBUILD_OUTPUT to point to the directory where the
# output files shall be placed. export
# KBUILD_OUTPUT=dir/to/store/output/files/ make
#
# The O= assignment takes precedence over the
# KBUILD_OUTPUT environment variable. KBUILD_SRC is
# not intended to be used by the regular user (for
# now), it is set on invocation of make with
# KBUILD_OUTPUT or O= specified.
ifeq ($(KBUILD_SRC),)
# OK, Make called in directory where kernel src
# resides Do we want to locate output files in a
# separate directory?
ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O) endif
# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ; ifneq ($(words
$(subst :, ,$(CURDIR))), 1)
$(error main directory cannot contain spaces nor
colons) endif ifneq ($(KBUILD_OUTPUT),)
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT) KBUILD_OUTPUT :=
$(shell mkdir -p $(KBUILD_OUTPUT) && cd
$(KBUILD_OUTPUT) \
&& /bin/pwd) $(if $(KBUILD_OUTPUT),, \
$(error failed to create output directory
"$(saved-output)")) PHONY += $(MAKECMDGOALS)
sub-make $(filter-out _all sub-make
$(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
@:
# Invoke a second make in the output directory,
# passing relevant variables
sub-make:
$(Q)$(MAKE) -C $(KBUILD_OUTPUT)
KBUILD_SRC=$(CURDIR) \
-f $(CURDIR)/Makefile $(filter-out _all
sub-make,$(MAKECMDGOALS))
# 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 ($(skip-makefile),)
# Do not print "Entering directory ...", but we want
# to display it when entering to the output
# directory so that IDEs/editors are able to
# understand relative filenames.
MAKEFLAGS += --no-print-directory
# Call a source code checker (by default, "sparse")
# as part of the C compilation.
#
# Use 'make C=1' to enable checking of only
# re-compiled files. Use 'make C=2' to enable
# checking of *all* source files, regardless of
# whether they are re-compiled or not.
#
# See the file "Documentation/dev-tools/sparse.rst"
# for more details, including where to get the
# "sparse" utility.
ifeq ("$(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 := $(M) endif ifeq ($(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 export KBUILD_CHECKSRC
KBUILD_EXTMOD KBUILD_SRC objtree := . src :=
$(srctree) obj := $(objtree) VPATH := $(srctree)$(if
$(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) export srctree
objtree VPATH
# To make sure we do not include .config for any of
# the *config targets catch them early, and hand
# them over to scripts/kconfig/Makefile It is
# allowed to specify more targets when calling make,
# including mixing *config targets and build
# targets. For example 'make oldconfig all'. Detect
# when mixed targets is specified, and make a second
# invocation of make so .config is not included in
# this case either (for *config).
version_h := include/generated/uapi/linux/version.h
old_version_h := include/linux/version.h
no-dot-config-targets := clean mrproper distclean \
cscope gtags TAGS tags
help% %docs check% coccicheck \
$(version_h) headers_%
archheaders archscripts \
kernelversion %src-pkg
config-targets := 0 mixed-targets := 0 dot-config :=
1 ifneq ($(filter $(no-dot-config-targets),
$(MAKECMDGOALS)),)
ifeq ($(filter-out $(no-dot-config-targets),
$(MAKECMDGOALS)),)
dot-config := 0
endif endif ifeq ($(KBUILD_EXTMOD),)
ifneq ($(filter config
%config,$(MAKECMDGOALS)),)
config-targets := 1
ifneq ($(words $(MAKECMDGOALS)),1)
mixed-targets := 1
endif
endif endif
# install and modules_install need also be processed
# one by one
ifneq ($(filter install,$(MAKECMDGOALS)),)
ifneq ($(filter
modules_install,$(MAKECMDGOALS)),)
mixed-targets := 1
endif endif ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build
# targets). Handle them one by one.
PHONY += $(MAKECMDGOALS) __build_one_by_one
$(filter-out __build_one_by_one, $(MAKECMDGOALS)):
__build_one_by_one
@: __build_one_by_one:
$(Q)set -e; \
for i in $(MAKECMDGOALS); do \
$(MAKE) -f $(srctree)/Makefile $$i;
\
done else
# We need some generic definitions (do not try to
# remake the file).
scripts/Kbuild.include: ; include
scripts/Kbuild.include
# Read KERNELRELEASE from
# include/config/kernel.release (if it exists)
KERNELRELEASE = $(shell cat
include/config/kernel.release 2> /dev/null)
KERNELVERSION = $(VERSION)$(if
$(PATCHLEVEL),.$(PATCHLEVEL)$(if
$(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) export
VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE
KERNELVERSION
# SUBARCH tells the usermode build what the
# underlying arch is. That is set first, and if a
# usermode build is happening, the "ARCH=um" on the
# command line overrides the setting of ARCH below.
# If a native build is happening, then ARCH is
# assigned, getting whatever value it gets normally,
# and SUBARCH is subsequently ignored.
SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e
s/x86_64/x86/ \
-e
s/sun4u/sparc64/ \
-e s/arm.*/arm/ -e
s/sa110/arm/ \
-e s/s390x/s390/
-e s/parisc64/parisc/ \
-e
s/ppc.*/powerpc/ -e s/mips.*/mips/ \
-e s/sh[234].*/sh/
-e s/aarch64.*/arm64/ )
# 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. A
# third alternative is to store a setting in .config
# so that plain "make" in the configured kernel
# build directory always uses that. Default value
# for CROSS_COMPILE is not to prefix executables
# Note: Some architectures assign CROSS_COMPILE in
# their arch/*/Makefile
ARCH ?= $(SUBARCH) CROSS_COMPILE ?=
$(CONFIG_CROSS_COMPILE:"%"=%)
# Architecture as present in compile.h
UTS_MACHINE := $(ARCH) SRCARCH := $(ARCH)
# Additional ARCH settings for x86
ifeq ($(ARCH),i386)
SRCARCH := x86 endif ifeq ($(ARCH),x86_64)
SRCARCH := x86 endif
# Additional ARCH settings for sparc
ifeq ($(ARCH),sparc32)
SRCARCH := sparc endif ifeq ($(ARCH),sparc64)
SRCARCH := sparc endif
# Additional ARCH settings for sh
ifeq ($(ARCH),sh64)
SRCARCH := sh endif
# Additional ARCH settings for tile
ifeq ($(ARCH),tilepro)
SRCARCH := tile endif ifeq ($(ARCH),tilegx)
SRCARCH := tile endif
# Where to locate arch specific headers
hdr-arch := $(SRCARCH) KCONFIG_CONFIG ?= .config
export KCONFIG_CONFIG
# 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) HOST_LFS_CFLAGS :=
$(shell getconf LFS_CFLAGS 2>/dev/null)
HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS
2>/dev/null) HOST_LFS_LIBS := $(shell getconf
LFS_LIBS 2>/dev/null) HOSTCC = gcc HOSTCXX = g++
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 :=
$(HOST_LFS_LIBS) ifeq ($(shell $(HOSTCC) -v 2>&1 |
grep -c "clang version"), 1) HOSTCFLAGS +=
-Wno-unused-value -Wno-unused-parameter \
-Wno-missing-field-initializers
endif
# Make variables (CC, etc...)
AS = $(CROSS_COMPILE)as LD = $(CROSS_COMPILE)ld
REAL_CC = $(CROSS_COMPILE)gcc LDGOLD =
$(CROSS_COMPILE)ld.gold 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 INSTALLKERNEL :=
installkernel DEPMOD = /sbin/depmod PERL = perl
PYTHON = python CHECK = sparse
# Use the wrapper for the compiler. This wrapper
# scans for new warnings and causes the build to
# stop upon encountering them
CC = $(PYTHON) $(srctree)/scripts/gcc-wrapper.py
$(REAL_CC) CHECKFLAGS := -D__linux__ -Dlinux
-D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void $(CF)
NOSTDINC_FLAGS = CFLAGS_MODULE = AFLAGS_MODULE =
LDFLAGS_MODULE = CFLAGS_KERNEL = AFLAGS_KERNEL =
LDFLAGS_vmlinux =
# Use USERINCLUDE when you must reference the UAPI
# directories only.
USERINCLUDE := \
-I$(srctree)/arch/$(hdr-arch)/include/uapi
\
-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi
\
-I$(srctree)/include/uapi \
-I$(objtree)/include/generated/uapi
\
-include
$(srctree)/include/linux/kconfig.h
# Use LINUXINCLUDE when you must reference the
# include/ directory. Needed to be compatible with
# the O= option
LINUXINCLUDE := \
-I$(srctree)/arch/$(hdr-arch)/include
\
-I$(objtree)/arch/$(hdr-arch)/include/generated
\
$(if $(KBUILD_SRC),
-I$(srctree)/include) \
-I$(objtree)/include \
$(USERINCLUDE) KBUILD_AFLAGS :=
-D__ASSEMBLY__ KBUILD_CFLAGS := -Wall -Wundef
-Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -fno-common
-fshort-wchar \
-Werror-implicit-function-declaration
\
-Wno-format-security \
-std=gnu89 KBUILD_CPPFLAGS :=
-D__KERNEL__ KBUILD_AFLAGS_KERNEL :=
KBUILD_CFLAGS_KERNEL := KBUILD_AFLAGS_MODULE :=
-DMODULE KBUILD_CFLAGS_MODULE := -DMODULE
KBUILD_LDFLAGS_MODULE := -T
$(srctree)/scripts/module-common.lds
GCC_PLUGINS_CFLAGS := CLANG_FLAGS := export ARCH
SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE
AS LD CC export CPP AR NM STRIP OBJCOPY OBJDUMP
HOSTLDFLAGS HOST_LOADLIBES export MAKE AWK GENKSYMS
INSTALLKERNEL PERL PYTHON UTS_MACHINE export HOSTCXX
HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS export
KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE
OBJCOPYFLAGS LDFLAGS export KBUILD_CFLAGS
CFLAGS_KERNEL CFLAGS_MODULE export CFLAGS_KASAN
CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN export
KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE export
KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE
KBUILD_LDFLAGS_MODULE export KBUILD_AFLAGS_KERNEL
KBUILD_CFLAGS_KERNEL export KBUILD_ARFLAGS
# 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
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 export
RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper
--exclude .svn \
--exclude CVS --exclude .pc
--exclude .hg --exclude .git
# ===========================================================================
# Rules shared between *config targets and build
# targets Basic helpers built in scripts/basic/
PHONY += scripts_basic scripts_basic:
$(Q)$(MAKE) $(build)=scripts/basic
$(Q)rm -f .tmp_quiet_recordmcount
# To avoid any implicit rule to kick in, define an
# empty command.
scripts/basic/%: scripts_basic ; PHONY +=
outputmakefile
# outputmakefile generates a Makefile in the output
# directory, if using a separate output directory.
# This allows convenient use of make in the output
# directory.
outputmakefile: ifneq ($(KBUILD_SRC),)
$(Q)ln -fsn $(srctree) source
$(Q)$(CONFIG_SHELL)
$(srctree)/scripts/mkmakefile \
$(srctree) $(objtree) $(VERSION)
$(PATCHLEVEL) endif ifeq ($(cc-name),clang) ifneq
($(CROSS_COMPILE),) CLANG_TRIPLE ?= $(CROSS_COMPILE)
CLANG_FLAGS += --target=$(notdir
$(CLANG_TRIPLE:%-=%)) GCC_TOOLCHAIN_DIR := $(dir
$(shell which $(CROSS_COMPILE)elfedit)) CLANG_FLAGS
+= --prefix=$(GCC_TOOLCHAIN_DIR) GCC_TOOLCHAIN :=
$(realpath $(GCC_TOOLCHAIN_DIR)/..) endif ifneq
($(GCC_TOOLCHAIN),) CLANG_FLAGS +=
--gcc-toolchain=$(GCC_TOOLCHAIN) endif CLANG_FLAGS
+= -no-integrated-as CLANG_FLAGS +=
-Werror=unknown-warning-option KBUILD_CFLAGS +=
$(CLANG_FLAGS) KBUILD_AFLAGS += $(CLANG_FLAGS)
export CLANG_FLAGS endif RETPOLINE_CFLAGS_GCC :=
-mindirect-branch=thunk-extern
-mindirect-branch-register RETPOLINE_VDSO_CFLAGS_GCC
:= -mindirect-branch=thunk-inline
-mindirect-branch-register RETPOLINE_CFLAGS_CLANG :=
-mretpoline-external-thunk
RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
RETPOLINE_CFLAGS := $(call
cc-option,$(RETPOLINE_CFLAGS_GCC),$(call
cc-option,$(RETPOLINE_CFLAGS_CLANG)))
RETPOLINE_VDSO_CFLAGS := $(call
cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call
cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG))) export
RETPOLINE_CFLAGS export RETPOLINE_VDSO_CFLAGS ifeq
($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are
# updated, and descend in scripts/kconfig to make
# the *config target Read arch specific Makefile to
# set KBUILD_DEFCONFIG as needed. KBUILD_DEFCONFIG
# may point out an alternative default configuration
# used for 'make defconfig'
include arch/$(SRCARCH)/Makefile export
KBUILD_DEFCONFIG KBUILD_KCONFIG config:
scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@
%config: scripts_basic outputmakefile FORCE
$(Q)$(MAKE) $(build)=scripts/kconfig $@ else
# ===========================================================================
# Build targets only - this includes vmlinux, arch
# specific targets, clean targets and others. In
# general all targets except *config targets. If
# building an external module we do not care about
# the all: rule but instead _all depend on modules
PHONY += all ifeq ($(KBUILD_EXTMOD),) _all: all else
_all: modules endif
# Decide whether to build built-in, modular, or
# both. Normally, just do built-in.
KBUILD_MODULES := KBUILD_BUILTIN := 1
# If we have only "make modules", don't compile
# built-in objects. When we're building modules with
# modversions, we need to consider the built-in
# objects during the descend as well, in order to
# make sure the checksums are up to date before we
# record them.
ifeq ($(MAKECMDGOALS),modules)
KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif
# If we have "make <whatever> modules", compile
# modules in addition to whatever we do anyway. Just
# "make" or "make all" shall build modules as well
ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
KBUILD_MODULES := 1 endif ifeq ($(MAKECMDGOALS),)
KBUILD_MODULES := 1 endif export KBUILD_MODULES
KBUILD_BUILTIN ifeq ($(KBUILD_EXTMOD),)
# Additional helpers built in scripts/ Carefully
# list dependencies so we do not try to build
# scripts twice in parallel
PHONY += scripts scripts: scripts_basic
include/config/auto.conf
include/config/tristate.conf \
asm-generic gcc-plugins
$(Q)$(MAKE) $(build)=$(@)
# Objects we will link into vmlinux / subdirs we
# need to visit
init-y := init/ drivers-y := drivers/ sound/
firmware/ net-y := net/ libs-y := lib/ core-y :=
usr/ virt-y := virt/ endif # KBUILD_EXTMOD ifeq
($(dot-config),1)
# Read in config
-include include/config/auto.conf ifeq
($(KBUILD_EXTMOD),)
# Read in dependencies to all Kconfig* files, make
# sure to run oldconfig if changes are detected.
-include include/config/auto.conf.cmd
# To avoid any implicit rule to kick in, define an
# empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
# If .config is newer than include/config/auto.conf,
# someone tinkered with it and forgot to run make
# oldconfig. if auto.conf.cmd is missing then we are
# probably in a cleaned tree so we execute the
# config step to be sure to catch updated Kconfig
# files
include/config/%.conf: $(KCONFIG_CONFIG)
include/config/auto.conf.cmd
$(Q)$(MAKE) -f $(srctree)/Makefile
silentoldconfig else
# external modules needs
# include/generated/autoconf.h and
# include/config/auto.conf 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:
$(Q)test -e include/generated/autoconf.h -a
-e $@ || ( \
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 ; \
/bin/false) endif # KBUILD_EXTMOD else
# Dummy target needed, because used as prerequisite
include/config/auto.conf: ; endif # $(dot-config)
# 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
# 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 Defaults to vmlinux, but the arch makefile
# usually adds further targets
all: vmlinux KBUILD_CFLAGS += $(call
cc-option,-fno-PIE) KBUILD_AFLAGS += $(call
cc-option,-fno-PIE) CFLAGS_GCOV := -fprofile-arcs
-ftest-coverage \
$(call cc-option,-fno-tree-loop-im)
\
$(call
cc-disable-warning,maybe-uninitialized,) CFLAGS_KCOV
:= $(call cc-option,-fsanitize-coverage=trace-pc,)
export CFLAGS_GCOV CFLAGS_KCOV
# Make toolchain changes before including
# arch/$(SRCARCH)/Makefile to ensure ar/cc/ld-*
# macros return correct values.
ifdef CONFIG_LTO_CLANG
# use GNU gold with LLVMgold for LTO linking, and LD
# for vmlinux_link
LDFINAL_vmlinux := $(LD) LD := $(LDGOLD) LDFLAGS +=
-plugin LLVMgold.so
# use llvm-ar for building symbol tables from IR
# files, and llvm-dis instead of objdump for
# processing symbol versions and exports
LLVM_AR := llvm-ar LLVM_DIS := llvm-dis export
LLVM_AR LLVM_DIS endif
# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to
# override the default values of the respective
# KBUILD_* variables
ARCH_CPPFLAGS := ARCH_AFLAGS := ARCH_CFLAGS :=
include arch/$(SRCARCH)/Makefile KBUILD_CFLAGS +=
$(call cc-option,-fno-delete-null-pointer-checks,)
KBUILD_CFLAGS += $(call
cc-disable-warning,frame-address,) 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)
KBUILD_CFLAGS += $(call cc-disable-warning,
address-of-packed-member) KBUILD_CFLAGS += $(call
cc-disable-warning, attribute-alias) ifdef
CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += -Os
$(call cc-disable-warning,maybe-uninitialized,) else
ifdef CONFIG_PROFILE_ALL_BRANCHES KBUILD_CFLAGS +=
-O2 $(call cc-disable-warning,maybe-uninitialized,)
else KBUILD_CFLAGS += -O2 endif endif KBUILD_CFLAGS
+= $(call cc-ifversion, -lt, 0409, \
$(call
cc-disable-warning,maybe-uninitialized,))
# Tell gcc to never replace conditional load with a
# non-conditional one
KBUILD_CFLAGS += $(call
cc-option,--param=allow-store-data-races=0)
# check for 'asm goto'
ifeq ($(shell $(CONFIG_SHELL)
$(srctree)/scripts/gcc-goto.sh $(CC)
$(KBUILD_CFLAGS)), y)
KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO endif
include scripts/Makefile.gcc-plugins 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,) \
$(call
cc-option,-fno-partial-inlining) endif ifneq
($(CONFIG_FRAME_WARN),0) KBUILD_CFLAGS += $(call
cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
endif
# This selects the stack protector compiler flag.
# Testing it is delayed until after .config has been
# reprocessed, in the prepare-compiler-check target.
ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
stackp-flag := -fstack-protector
stackp-name := REGULAR else ifdef
CONFIG_CC_STACKPROTECTOR_STRONG
stackp-flag := -fstack-protector-strong
stackp-name := STRONG else
# Force off for distro compilers that enable stack
# protector by default.
stackp-flag := $(call cc-option,
-fno-stack-protector) endif endif
# Find arch-specific stack protector compiler
# sanity-checking script.
ifdef CONFIG_CC_STACKPROTECTOR
stackp-path :=
$(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
stackp-check := $(wildcard $(stackp-path)) endif
KBUILD_CFLAGS += $(stackp-flag) ifeq
($(cc-name),clang) KBUILD_CPPFLAGS += $(call
cc-option,-Qunused-arguments,) KBUILD_CFLAGS +=
$(call cc-disable-warning, format-invalid-specifier)
KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
KBUILD_CFLAGS += $(call cc-disable-warning,
duplicate-decl-specifier) KBUILD_CFLAGS +=
-fno-builtin KBUILD_CFLAGS += $(call cc-option,
-Wno-undefined-optimized) KBUILD_CFLAGS += $(call
cc-option,
-Wno-tautological-constant-out-of-range-compare)
KBUILD_CFLAGS += $(call cc-option, -mllvm
-disable-struct-const-merge) KBUILD_CFLAGS += $(call
cc-option, -Wno-sometimes-uninitialized)
# 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) else
KBUILD_CFLAGS += $(call
cc-option,-fno-delete-null-pointer-checks,)
# 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) endif KBUILD_CFLAGS +=
$(call cc-disable-warning, unused-const-variable)
ifdef CONFIG_FRAME_POINTER KBUILD_CFLAGS +=
-fno-omit-frame-pointer -fno-optimize-sibling-calls
else
# 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 KBUILD_CFLAGS +=
-fomit-frame-pointer endif endif KBUILD_CFLAGS +=
$(call cc-option, -fno-var-tracking-assignments)
ifdef CONFIG_DEBUG_INFO ifdef
CONFIG_DEBUG_INFO_SPLIT KBUILD_CFLAGS += $(call
cc-option, -gsplit-dwarf, -g) else KBUILD_CFLAGS +=
-g endif KBUILD_AFLAGS += -Wa,-gdwarf-2 endif ifdef
CONFIG_DEBUG_INFO_DWARF4 KBUILD_CFLAGS += $(call
cc-option, -gdwarf-4,) endif ifdef
CONFIG_DEBUG_INFO_REDUCED KBUILD_CFLAGS += $(call
cc-option, -femit-struct-debug-baseonly) \
$(call
cc-option,-fno-var-tracking) endif ifdef
CONFIG_FUNCTION_TRACER ifndef CC_FLAGS_FTRACE
CC_FLAGS_FTRACE := -pg endif export CC_FLAGS_FTRACE
ifdef CONFIG_HAVE_FENTRY CC_USING_FENTRY :=
$(call cc-option, -mfentry -DCC_USING_FENTRY) endif
KBUILD_CFLAGS += $(CC_FLAGS_FTRACE)
$(CC_USING_FENTRY) KBUILD_AFLAGS +=
$(CC_USING_FENTRY) ifdef CONFIG_DYNAMIC_FTRACE
ifdef CONFIG_HAVE_C_RECORDMCOUNT
BUILD_C_RECORDMCOUNT := y
export BUILD_C_RECORDMCOUNT
endif endif endif
# We trigger additional mismatches with less
# inlining
ifdef CONFIG_DEBUG_SECTION_MISMATCH KBUILD_CFLAGS +=
$(call cc-option, -fno-inline-functions-called-once)
endif ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
KBUILD_CFLAGS += $(call
cc-option,-ffunction-sections,) KBUILD_CFLAGS +=
$(call cc-option,-fdata-sections,) endif ifdef
CONFIG_LTO_CLANG lto-clang-flags := -flto
-fvisibility=hidden
# allow disabling only clang LTO where needed
DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
export DISABLE_LTO_CLANG endif ifdef CONFIG_LTO
lto-flags := $(lto-clang-flags) KBUILD_CFLAGS +=
$(lto-flags) DISABLE_LTO := $(DISABLE_LTO_CLANG)
export DISABLE_LTO
# LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be
# set to override the linker and flags for
# vmlinux_link.
export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux endif
ifdef CONFIG_CFI_CLANG cfi-clang-flags +=
-fsanitize=cfi DISABLE_CFI_CLANG :=
-fno-sanitize=cfi ifdef CONFIG_MODULES
cfi-clang-flags += -fsanitize-cfi-cross-dso
DISABLE_CFI_CLANG += -fno-sanitize-cfi-cross-dso
endif ifdef CONFIG_CFI_PERMISSIVE cfi-clang-flags +=
-fsanitize-recover=cfi -fno-sanitize-trap=cfi endif
# also disable CFI when LTO is disabled
DISABLE_LTO_CLANG += $(DISABLE_CFI_CLANG)
# allow disabling only clang CFI where needed
export DISABLE_CFI_CLANG endif ifdef CONFIG_CFI
# cfi-flags are re-tested in prepare-compiler-check
cfi-flags := $(cfi-clang-flags) KBUILD_CFLAGS +=
$(cfi-flags) DISABLE_CFI := $(DISABLE_CFI_CLANG)
DISABLE_LTO += $(DISABLE_CFI) export DISABLE_CFI
endif
# arch Makefile may override CC so keep this after
# arch Makefile is included
NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC)
-print-file-name=include) CHECKFLAGS +=
$(NOSTDINC_FLAGS)
# warn about C99 declaration after statement
KBUILD_CFLAGS += $(call
cc-option,-Wdeclaration-after-statement,)
# disable pointer signed / unsigned warnings in gcc
# 4.0
KBUILD_CFLAGS += $(call cc-disable-warning,
pointer-sign)
# disable stringop warnings in gcc 8+
KBUILD_CFLAGS += $(call cc-disable-warning,
stringop-truncation)
# disable invalid "can't wrap" optimizations for
# signed / pointers
KBUILD_CFLAGS += $(call
cc-option,-fno-strict-overflow)
# clang sets -fmerge-all-constants by default as
# optimization, but this is non-conforming behavior
# for C and in fact breaks the kernel, so we need to
# disable it here generally.
KBUILD_CFLAGS += $(call
cc-option,-fno-merge-all-constants)
# for gcc -fno-merge-all-constants disables
# everything, but it is fine to have actual
# conforming behavior enabled.
KBUILD_CFLAGS += $(call
cc-option,-fmerge-constants)
# Make sure -fstack-check isn't enabled (like gentoo
# apparently did)
KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
# conserve stack if available
KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
# 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)
# Prohibit date/time macros, which would make the
# build non-deterministic
KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
# enforce correct pointer usage
KBUILD_CFLAGS += $(call
cc-option,-Werror=incompatible-pointer-types)
# Require designated initializers for all marked
# structures
KBUILD_CFLAGS += $(call
cc-option,-Werror=designated-init)
# change __FILE__ to the relative path from the
# srctree
KBUILD_CFLAGS += $(call
cc-option,-fmacro-prefix-map=$(srctree)/=)
# ensure -fcf-protection is disabled when using
# retpoline as it is incompatible with
# -mindirect-branch=thunk-extern
ifdef CONFIG_RETPOLINE KBUILD_CFLAGS += $(call
cc-option,-fcf-protection=none) endif
# use the deterministic mode of AR if available
KBUILD_ARFLAGS := $(call ar-option,D) include
scripts/Makefile.kasan include
scripts/Makefile.extrawarn include
scripts/Makefile.ubsan
# 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)
# Use --build-id when available.
LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
$(call cc-ldoption,
-Wl$(comma)--build-id,)) KBUILD_LDFLAGS_MODULE +=
$(LDFLAGS_BUILD_ID) LDFLAGS_vmlinux +=
$(LDFLAGS_BUILD_ID) ifdef
CONFIG_LD_DEAD_CODE_DATA_ELIMINATION LDFLAGS_vmlinux
+= $(call ld-option, --gc-sections,) endif ifeq
($(CONFIG_STRIP_ASM_SYMS),y) LDFLAGS_vmlinux +=
$(call ld-option, -X,) endif
# Default kernel image to build when no specific
# target is given. KBUILD_IMAGE may be overruled on
# the command line or set in the environment Also
# any assignments in arch/$(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
#
# 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)
#
# INSTALL_MOD_PATH specifies a prefix to MODLIB for
# module directory relocations required by build
# roots. This is not defined in the makefile but
# the argument can be passed to make if needed.
#
MODLIB =
$(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
export MODLIB
#
# 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.
ifdef INSTALL_MOD_STRIP ifeq
($(INSTALL_MOD_STRIP),1) mod_strip_cmd = $(STRIP)
--strip-debug else mod_strip_cmd = $(STRIP)
$(INSTALL_MOD_STRIP) endif # INSTALL_MOD_STRIP=1
else mod_strip_cmd = true endif # INSTALL_MOD_STRIP
export mod_strip_cmd
# CONFIG_MODULE_COMPRESS, if defined, will cause
# module to be compressed after they are installed
# in agreement with CONFIG_MODULE_COMPRESS_GZIP or
# CONFIG_MODULE_COMPRESS_XZ.
mod_compress_cmd = true ifdef CONFIG_MODULE_COMPRESS
ifdef CONFIG_MODULE_COMPRESS_GZIP
mod_compress_cmd = gzip -n -f
endif # CONFIG_MODULE_COMPRESS_GZIP
ifdef CONFIG_MODULE_COMPRESS_XZ
mod_compress_cmd = xz -f
endif # CONFIG_MODULE_COMPRESS_XZ endif #
CONFIG_MODULE_COMPRESS export mod_compress_cmd
# Select initial ramdisk compression format, default
# is gzip(1). This shall be used by the dracut(8)
# tool while creating an initramfs image.
#
INITRD_COMPRESS-y := gzip
INITRD_COMPRESS-$(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
# do not export INITRD_COMPRESS, since we didn't
# actually choose a sane default compression above.
# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
ifdef CONFIG_MODULE_SIG_ALL $(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 else mod_sign_cmd = true
endif export mod_sign_cmd HOST_LIBELF_LIBS = $(shell
pkg-config libelf --libs 2>/dev/null || echo -lelf)
ifdef CONFIG_STACK_VALIDATION
has_libelf := $(call try-run,\
echo "int main() {}" | $(HOSTCC) -xc
-o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
ifeq ($(has_libelf),1)
objtool_target := tools/objtool FORCE
else
SKIP_STACK_VALIDATION := 1
export SKIP_STACK_VALIDATION
endif endif ifeq ($(KBUILD_EXTMOD),) core-y +=
kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
vmlinux-dirs := $(patsubst %/,%,$(filter %/,
$(init-y) $(init-m) \
$(core-y) $(core-m)
$(drivers-y) $(drivers-m) \
$(net-y) $(net-m) $(libs-y)
$(libs-m) $(virt-y))) vmlinux-alldirs := $(sort
$(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
$(init-) $(core-) $(drivers-)
$(net-) $(libs-) $(virt-)))) 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 := $(filter-out %.a,
$(patsubst %/, %/built-in.o, $(libs-y))) virt-y :=
$(patsubst %/, %/built-in.o, $(virt-y))
# Externally visible symbols (used by
# link-vmlinux.sh)
export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2)
$(drivers-y) $(net-y) $(virt-y) export
KBUILD_VMLINUX_LIBS := $(libs-y1) export KBUILD_LDS
:= arch/$(SRCARCH)/kernel/vmlinux.lds
export LDFLAGS_vmlinux
# used by scripts/package/Makefile
export KBUILD_ALLDIRS := $(sort $(filter-out
arch/%,$(vmlinux-alldirs)) arch Documentation
include samples scripts tools) vmlinux-deps :=
$(KBUILD_LDS) $(KBUILD_VMLINUX_INIT)
$(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
# 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 ifdef CONFIG_HEADERS_CHECK
$(Q)$(MAKE) -f $(srctree)/Makefile
headers_check endif ifdef CONFIG_GDB_SCRIPTS
$(Q)ln -fsn $(abspath
$(srctree)/scripts/gdb/vmlinux-gdb.py) endif ifdef
CONFIG_TRIM_UNUSED_KSYMS
$(Q)$(CONFIG_SHELL)
$(srctree)/scripts/adjust_autoksyms.sh \
"$(MAKE) -f $(srctree)/Makefile vmlinux"
endif
# standalone target for easier testing
include/generated/autoksyms.h: FORCE
$(Q)$(CONFIG_SHELL)
$(srctree)/scripts/adjust_autoksyms.sh true
ARCH_POSTLINK := $(wildcard
$(srctree)/arch/$(SRCARCH)/Makefile.postlink)
# Final link of vmlinux with optional arch pass
# after final link
cmd_link-vmlinux = \
$(CONFIG_SHELL) $< $(LD) $(LDFLAGS)
$(LDFLAGS_vmlinux) ; \
$(if $(ARCH_POSTLINK), $(MAKE) -f
$(ARCH_POSTLINK) $@, true) vmlinux:
scripts/link-vmlinux.sh vmlinux_prereq
$(vmlinux-deps) FORCE
+$(call if_changed,link-vmlinux)
# Build samples along the rest of the kernel
ifdef CONFIG_SAMPLES vmlinux-dirs += samples endif
# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
# 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
PHONY += $(vmlinux-dirs) $(vmlinux-dirs): prepare
scripts
$(Q)$(MAKE) $(build)=$@ define
filechk_kernel.release
echo "$(KERNELVERSION)$$($(CONFIG_SHELL)