diff options
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 1761 |
1 files changed, 1761 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 000000000..14ba089d5 --- /dev/null +++ b/Makefile @@ -0,0 +1,1761 @@ +# SPDX-License-Identifier: GPL-2.0 +VERSION = 4 +PATCHLEVEL = 19 +SUBLEVEL = 249 +EXTRAVERSION = +NAME = "People's Front" + +# *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.a 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 $(KBUILD_OUTPUT) \ + && pwd) +$(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 + +clean-targets := %clean mrproper cleandocs +no-dot-config-targets := $(clean-targets) \ + cscope gtags TAGS tags help% %docs check% coccicheck \ + $(version_h) headers_% archheaders archscripts \ + %asm-generic kernelversion %src-pkg +no-sync-config-targets := $(no-dot-config-targets) install %install \ + kernelrelease + +config-targets := 0 +mixed-targets := 0 +dot-config := 1 +may-sync-config := 1 + +ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) + ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) + dot-config := 0 + endif +endif + +ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) + ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) + may-sync-config := 0 + endif +endif + +ifneq ($(KBUILD_EXTMOD),) + may-sync-config := 0 +endif + +ifeq ($(KBUILD_EXTMOD),) + ifneq ($(filter config %config,$(MAKECMDGOALS)),) + config-targets := 1 + ifneq ($(words $(MAKECMDGOALS)),1) + mixed-targets := 1 + endif + endif +endif + +# For "make -j clean all", "make -j mrproper defconfig all", etc. +ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) + ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) + mixed-targets := 1 + 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 $$i; \ + done + +else + +# We need some generic definitions (do not try to remake the file). +scripts/Kbuild.include: ; +include scripts/Kbuild.include + +# Read KERNELRELEASE from include/config/kernel.release (if it exists) +KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) +KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION) +export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION + +include scripts/subarch.include + +# Cross compiling and selecting different set of gcc/bin-utils +# --------------------------------------------------------------------------- +# +# When performing cross compilation for other architectures ARCH shall be set +# to the target architecture. (See arch/* for the possibilities). +# ARCH can be set during invocation of make: +# make ARCH=ia64 +# Another way is to have ARCH set in the environment. +# The default ARCH is the host where make is executed. + +# CROSS_COMPILE specify the prefix used for all executables used +# during compilation. Only gcc and related bin-utils executables +# are prefixed with $(CROSS_COMPILE). +# CROSS_COMPILE can be set on the command line +# make CROSS_COMPILE=ia64-linux- +# Alternatively CROSS_COMPILE can be set in the environment. +# Default value for CROSS_COMPILE is not to prefix executables +# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile +ARCH ?= $(SUBARCH) + +# Architecture as present in compile.h +UTS_MACHINE := $(ARCH) +SRCARCH := $(ARCH) + +# Additional ARCH settings for x86 +ifeq ($(ARCH),i386) + SRCARCH := x86 +endif +ifeq ($(ARCH),x86_64) + SRCARCH := x86 +endif + +# Additional ARCH settings for sparc +ifeq ($(ARCH),sparc32) + SRCARCH := sparc +endif +ifeq ($(ARCH),sparc64) + SRCARCH := sparc +endif + +# Additional ARCH settings for sh +ifeq ($(ARCH),sh64) + SRCARCH := sh +endif + +KCONFIG_CONFIG ?= .config +export KCONFIG_CONFIG + +# SHELL used by kbuild +CONFIG_SHELL := $(shell if [ -x "$$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 := $(shell getconf LFS_LIBS 2>/dev/null) + +ifneq ($(LLVM),) +HOSTCC = clang +HOSTCXX = clang++ +else +HOSTCC = gcc +HOSTCXX = g++ +endif +KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \ + -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \ + $(HOSTCFLAGS) +KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) +KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) +KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) + +# Make variables (CC, etc...) +CPP = $(CC) -E +ifneq ($(LLVM),) +CC = clang +LD = ld.lld +AR = llvm-ar +NM = llvm-nm +OBJCOPY = llvm-objcopy +OBJDUMP = llvm-objdump +READELF = llvm-readelf +OBJSIZE = llvm-size +STRIP = llvm-strip +else +CC = $(CROSS_COMPILE)gcc +LD = $(CROSS_COMPILE)ld +AR = $(CROSS_COMPILE)ar +NM = $(CROSS_COMPILE)nm +OBJCOPY = $(CROSS_COMPILE)objcopy +OBJDUMP = $(CROSS_COMPILE)objdump +READELF = $(CROSS_COMPILE)readelf +OBJSIZE = $(CROSS_COMPILE)size +STRIP = $(CROSS_COMPILE)strip +endif +LEX = flex +YACC = bison +AWK = awk +GENKSYMS = scripts/genksyms/genksyms +INSTALLKERNEL := installkernel +DEPMOD = depmod +PERL = perl +PYTHON = python +PYTHON2 = python2 +PYTHON3 = python3 +CHECK = sparse + +CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ + -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) +NOSTDINC_FLAGS = +CFLAGS_MODULE = +AFLAGS_MODULE = +LDFLAGS_MODULE = +CFLAGS_KERNEL = +AFLAGS_KERNEL = +LDFLAGS_vmlinux = + +# Use USERINCLUDE when you must reference the UAPI directories only. +USERINCLUDE := \ + -I$(srctree)/arch/$(SRCARCH)/include/uapi \ + -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \ + -I$(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/$(SRCARCH)/include \ + -I$(objtree)/arch/$(SRCARCH)/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 \ + -Werror=return-type -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 +KBUILD_LDFLAGS := +GCC_PLUGINS_CFLAGS := +CLANG_FLAGS := + +export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC +export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS +export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE +export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS + +export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_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 ($(CROSS_COMPILE),) +CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%)) +GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit)) +CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE)) +GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..) +endif +ifneq ($(GCC_TOOLCHAIN),) +CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN) +endif +ifneq ($(LLVM_IAS),1) +CLANG_FLAGS += -no-integrated-as +endif +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 + +KBUILD_CFLAGS += $(call cc-option,-fno-PIE) +KBUILD_AFLAGS += $(call cc-option,-fno-PIE) + +# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included. +# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile. +# CC_VERSION_TEXT is referenced from Kconfig (so it needs export), +# and from include/config/auto.conf.cmd to detect the compiler upgrade. +CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1) + +ifeq ($(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 CC_VERSION_TEXT + +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. +ifeq ($(MAKECMDGOALS),modules) + KBUILD_BUILTIN := +endif + +# If we have "make <whatever> modules", compile modules +# in addition to whatever we do anyway. +# Just "make" or "make all" shall build modules as well + +ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) + KBUILD_MODULES := 1 +endif + +ifeq ($(MAKECMDGOALS),) + KBUILD_MODULES := 1 +endif + +export KBUILD_MODULES KBUILD_BUILTIN + +ifeq ($(KBUILD_EXTMOD),) +# Objects we will link into vmlinux / subdirs we need to visit +init-y := init/ +drivers-y := drivers/ sound/ firmware/ +net-y := net/ +libs-y := lib/ +core-y := usr/ +virt-y := virt/ +endif # KBUILD_EXTMOD + +ifeq ($(dot-config),1) +include include/config/auto.conf +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 + +CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \ + $(call cc-option,-fno-tree-loop-im) \ + $(call cc-disable-warning,maybe-uninitialized,) +export CFLAGS_GCOV + +# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later. +ifdef CONFIG_FUNCTION_TRACER + CC_FLAGS_FTRACE := -pg +endif + +# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default +# values of the respective KBUILD_* variables +ARCH_CPPFLAGS := +ARCH_AFLAGS := +ARCH_CFLAGS := +include arch/$(SRCARCH)/Makefile + +ifeq ($(dot-config),1) +ifeq ($(may-sync-config),1) +# Read in dependencies to all Kconfig* files, make sure to run syncconfig if +# changes are detected. This should be included after arch/$(SRCARCH)/Makefile +# because some architectures define CROSS_COMPILE there. +include include/config/auto.conf.cmd + +# To avoid any implicit rule to kick in, define an empty command +$(KCONFIG_CONFIG): ; + +# The actual configuration files used during the build are stored in +# include/generated/ and include/config/. Update them if .config is newer than +# include/config/auto.conf (which mirrors .config). +# +# This exploits the 'multi-target pattern rule' trick. +# The syncconfig should be executed only once to make all the targets. +%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG) + $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig +else +# External modules and some install targets need 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 # may-sync-config +endif # $(dot-config) + +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) + +ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE +KBUILD_CFLAGS += -Os +else +KBUILD_CFLAGS += -O2 +endif + +# Tell gcc to never replace conditional load with a non-conditional one +KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) +KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) + +include scripts/Makefile.kcov +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 + +stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector +stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector +stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong + +KBUILD_CFLAGS += $(stackp-flags-y) + +ifeq ($(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) +# 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) +endif + +# 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) +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 += $(call cc-option, -gsplit-dwarf, -g) +else +KBUILD_CFLAGS += -g +endif +ifneq ($(LLVM_IAS),1) +KBUILD_AFLAGS += -Wa,-gdwarf-2 +endif +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) \ + $(call cc-option,-fno-var-tracking) +endif + +ifdef CONFIG_FUNCTION_TRACER +ifdef CONFIG_FTRACE_MCOUNT_RECORD + # gcc 5 supports generating the mcount tables directly + ifeq ($(call cc-option-yn,-mrecord-mcount),y) + CC_FLAGS_FTRACE += -mrecord-mcount + export CC_USING_RECORD_MCOUNT := 1 + endif + ifdef CONFIG_HAVE_NOP_MCOUNT + ifeq ($(call cc-option-yn, -mnop-mcount),y) + CC_FLAGS_FTRACE += -mnop-mcount + CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT + endif + endif +endif +ifdef CONFIG_HAVE_FENTRY + ifeq ($(call cc-option-yn, -mfentry),y) + CC_FLAGS_FTRACE += -mfentry + CC_FLAGS_USING += -DCC_USING_FENTRY + endif +endif +export CC_FLAGS_FTRACE +KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING) +KBUILD_AFLAGS += $(CC_FLAGS_USING) +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_KERNEL += -ffunction-sections -fdata-sections +LDFLAGS_vmlinux += --gc-sections +endif + +# arch Makefile may override CC so keep this after arch Makefile is included +NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) + +# 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) + +# We'll want to enable this eventually, but it's not going away for 5.7 at least +KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds) +KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds) +KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow) + +# Another good warning that we'll want to enable eventually +KBUILD_CFLAGS += $(call cc-disable-warning, restrict) + +# Enabled with W=2, disabled by default as noisy +KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized) + +# 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)/=) + +# 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 := $(call ld-option, --build-id) +KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID) +LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID) + +ifeq ($(CONFIG_STRIP_ASM_SYMS),y) +LDFLAGS_vmlinux += $(call ld-option, -X,) +endif + +# insure the checker run with the right endianness +CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian) + +# the checker needs the correct machine size +CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32) + +# Default kernel image to build when no specific target is given. +# KBUILD_IMAGE may be overruled on the command line or +# set in the environment +# Also any assignments in arch/$(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) $(KBUILD_HOSTLDFLAGS) -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 + +PHONY += prepare0 + +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.a, $(init-y)) +core-y := $(patsubst %/, %/built-in.a, $(core-y)) +drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y)) +net-y := $(patsubst %/, %/built-in.a, $(net-y)) +libs-y1 := $(patsubst %/, %/lib.a, $(libs-y)) +libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y))) +virt-y := $(patsubst %/, %/built-in.a, $(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) + +# Recurse until adjust_autoksyms.sh is satisfied +PHONY += autoksyms_recursive +autoksyms_recursive: $(vmlinux-deps) +ifdef CONFIG_TRIM_UNUSED_KSYMS + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ + "$(MAKE) -f $(srctree)/Makefile vmlinux" +endif + +# 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 + +autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) + +$(autoksyms_h): + $(Q)mkdir -p $(dir $@) + $(Q)touch $@ + +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) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \ + $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) + +vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE +ifdef CONFIG_HEADERS_CHECK + $(Q)$(MAKE) -f $(srctree)/Makefile headers_check +endif +ifdef CONFIG_GDB_SCRIPTS + $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) +endif + +$(call if_changed,link-vmlinux) + +# Build samples along the rest of the kernel. This needs headers_install. +ifdef CONFIG_SAMPLES +vmlinux-dirs += samples +samples: headers_install +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) $(build)=$@ need-builtin=1 + +define filechk_kernel.release + echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" +endef + +# Store (new) KERNELRELEASE string in include/config/kernel.release +include/config/kernel.release: $(srctree)/Makefile FORCE + $(call filechk,kernel.release) + +# Additional helpers built in scripts/ +# Carefully list dependencies so we do not try to build scripts twice +# in parallel +PHONY += scripts +scripts: scripts_basic asm-generic gcc-plugins $(autoksyms_h) + $(Q)$(MAKE) $(build)=$(@) + +# Things we need to do before we recursively start building the kernel +# 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. + +PHONY += prepare archprepare prepare1 prepare2 prepare3 + +# prepare3 is used to check if we are building in a separate output directory, +# and if so do: +# 1) Check that make has not been executed in the kernel src $(srctree) +prepare3: include/config/kernel.release +ifneq ($(KBUILD_SRC),) + @$(kecho) ' Using $(srctree) as source for kernel' + $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ + echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \ + echo >&2 " in the '$(srctree)' directory.";\ + /bin/false; \ + fi; +endif + +# 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 outputmakefile asm-generic + +prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h + $(cmd_crmodverdir) + +archprepare: archheaders archscripts prepare1 scripts_basic + +prepare0: archprepare gcc-plugins + $(Q)$(MAKE) $(build)=. + +# All the preparing.. +prepare: prepare0 prepare-objtool + +# Support for using generic headers in asm-generic +PHONY += asm-generic uapi-asm-generic +asm-generic: uapi-asm-generic + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ + src=asm obj=arch/$(SRCARCH)/include/generated/asm +uapi-asm-generic: + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \ + src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm + +PHONY += prepare-objtool +prepare-objtool: $(objtool_target) +ifeq ($(SKIP_STACK_VALIDATION),1) +ifdef CONFIG_UNWINDER_ORC + @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 + @false +else + @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2 +endif +endif + +# 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 +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 + +define filechk_version.h + (echo \#define LINUX_VERSION_CODE $(shell \ + expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 255); \ + echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) +endef + +$(version_h): FORCE + $(call filechk,version.h) + $(Q)rm -f $(old_version_h) + +include/generated/utsrelease.h: include/config/kernel.release FORCE + $(call filechk,utsrelease.h) + +PHONY += headerdep +headerdep: + $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \ + $(srctree)/scripts/headerdep.pl -I$(srctree)/include + +# --------------------------------------------------------------------------- +# Kernel headers + +#Default location for installed headers +export INSTALL_HDR_PATH = $(objtree)/usr + +# If we do an all arch process set dst to include/arch-$(SRCARCH) +hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include) + +PHONY += archheaders +archheaders: + +PHONY += archscripts +archscripts: + +PHONY += __headers +__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts + $(Q)$(MAKE) $(build)=scripts build_unifdef + +PHONY += headers_install_all +headers_install_all: + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install + +PHONY += headers_install +headers_install: __headers + $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \ + $(error Headers not exportable for the $(SRCARCH) architecture)) + $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include + $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) + +PHONY += headers_check_all +headers_check_all: headers_install_all + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check + +PHONY += headers_check +headers_check: headers_install + $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1 + $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1 + +# --------------------------------------------------------------------------- +# Kernel selftest + +PHONY += kselftest +kselftest: + $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests + +PHONY += kselftest-clean +kselftest-clean: + $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean + +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 + +# --------------------------------------------------------------------------- +# Modules + +ifdef CONFIG_MODULES + +# By default, build modules as well + +all: modules + +# 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. +ifdef CONFIG_MODVERSIONS + KBUILD_BUILTIN := 1 +endif + +# Build modules +# +# 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. + +PHONY += modules +modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin + $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order + @$(kecho) ' Building modules, stage 2.'; + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost + +modules.builtin: $(vmlinux-dirs:%=%/modules.builtin) + $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin + +%/modules.builtin: include/config/auto.conf include/config/tristate.conf + $(Q)$(MAKE) $(modbuiltin)=$* + + +# Target to prepare building external modules +PHONY += modules_prepare +modules_prepare: prepare scripts + +# Target to install modules +PHONY += modules_install +modules_install: _modinst_ _modinst_post + +PHONY += _modinst_ +_modinst_: + @rm -rf $(MODLIB)/kernel + @rm -f $(MODLIB)/source + @mkdir -p $(MODLIB)/kernel + @ln -s $(abspath $(srctree)) $(MODLIB)/source + @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ + rm -f $(MODLIB)/build ; \ + ln -s $(CURDIR) $(MODLIB)/build ; \ + fi + @cp -f $(objtree)/modules.order $(MODLIB)/ + @cp -f $(objtree)/modules.builtin $(MODLIB)/ + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst + +# This depmod is only for convenience to give the initial +# boot a modules.dep even before / is mounted read-write. However the +# boot script depmod is the master version. +PHONY += _modinst_post +_modinst_post: _modinst_ + $(call cmd,depmod) + +ifeq ($(CONFIG_MODULE_SIG), y) +PHONY += modules_sign +modules_sign: + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign +endif + +else # CONFIG_MODULES + +# Modules not configured +# --------------------------------------------------------------------------- + +PHONY += modules modules_install +modules modules_install: + @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 + @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) include/ksym + +# Directories & files removed with 'make mrproper' +MRPROPER_DIRS += include/config usr/include include/generated \ + arch/*/include/generated .tmp_objdiff +MRPROPER_FILES += .config .config.old .version \ + Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \ + signing_key.pem signing_key.priv signing_key.x509 \ + x509.genkey extra_certificates signing_key.x509.keyid \ + signing_key.x509.signer vmlinux-gdb.py + +# clean - Delete most, but leave enough to build external modules +# +clean: rm-dirs := $(CLEAN_DIRS) +clean: rm-files := $(CLEAN_FILES) +clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples) + +PHONY += $(clean-dirs) clean archclean vmlinuxclean +$(clean-dirs): + $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) + +vmlinuxclean: + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean + $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) + +clean: archclean vmlinuxclean + +# mrproper - Delete all generated files, including .config +# +mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) +mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) +mrproper-dirs := $(addprefix _mrproper_,scripts) + +PHONY += $(mrproper-dirs) mrproper archmrproper +$(mrproper-dirs): + $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) + +mrproper: clean archmrproper $(mrproper-dirs) + $(call cmd,rmdirs) + $(call cmd,rmfiles) + +# distclean +# +PHONY += distclean + +distclean: mrproper + @find $(srctree) $(RCS_FIND_IGNORE) \ + \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ + -o -name '*.bak' -o -name '#*#' -o -name '*%' \ + -o -name 'core' \) \ + -type f -print | xargs rm -f + + +# Packaging of the kernel to various formats +# --------------------------------------------------------------------------- +package-dir := scripts/package + +%src-pkg: FORCE + $(Q)$(MAKE) $(build)=$(package-dir) $@ +%pkg: include/config/kernel.release FORCE + $(Q)$(MAKE) $(build)=$(package-dir) $@ + + +# Brief documentation of the typical targets used +# --------------------------------------------------------------------------- + +boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig) +boards := $(sort $(notdir $(boards))) +board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig)) +board-dirs := $(sort $(notdir $(board-dirs:/=))) + +PHONY += help +help: + @echo 'Cleaning targets:' + @echo ' clean - Remove most generated files but keep the config and' + @echo ' enough build support to build external modules' + @echo ' mrproper - Remove all generated files + config + various backup files' + @echo ' distclean - mrproper + remove editor backup and patch files' + @echo '' + @echo 'Configuration targets:' + @$(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' + @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)' + @echo ' dir/ - Build all files in dir and below' + @echo ' dir/file.[ois] - Build specified target only' + @echo ' dir/file.ll - Build the LLVM assembly file' + @echo ' (requires compiler support for LLVM assembly generation)' + @echo ' dir/file.lst - Build specified mixed source/assembly target only' + @echo ' (requires a recent binutils and recent build (System.map))' + @echo ' dir/file.ko - Build module including final link' + @echo ' modules_prepare - Set up for building external modules' + @echo ' tags/TAGS - Generate tags file for editors' + @echo ' cscope - Generate cscope index' + @echo ' gtags - Generate GNU GLOBAL index' + @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)' + @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \ + echo ' (default: $(INSTALL_HDR_PATH))'; \ + echo '' + @echo 'Static analysers:' + @echo ' checkstack - Generate a list of stack hogs' + @echo ' namespacecheck - Name space analysis on compiled kernel' + @echo ' versioncheck - Sanity check on version.h usage' + @echo ' includecheck - Check for duplicate included header files' + @echo ' export_report - List the usages of all exported symbols' + @echo ' headers_check - Sanity check on exported headers' + @echo ' headerdep - Detect inclusion cycles in headers' + @echo ' coccicheck - Check with Coccinelle' + @echo '' + @echo 'Kernel selftest:' + @echo ' kselftest - Build and run kernel selftest (run as root)' + @echo ' Build, install, and boot kernel before' + @echo ' running kselftest on it' + @echo ' kselftest-clean - Remove all generated kselftest files' + @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing' + @echo ' .config.' + @echo '' + @echo 'Userspace tools targets:' + @echo ' use "make tools/help"' + @echo ' or "cd tools; make help"' + @echo '' + @echo 'Kernel packaging:' + @$(MAKE) $(build)=$(package-dir) help + @echo '' + @echo 'Documentation targets:' + @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp + @echo '' + @echo 'Architecture specific targets ($(SRCARCH)):' + @$(if $(archhelp),$(archhelp),\ + echo ' No architecture specific help defined for $(SRCARCH)') + @echo '' + @$(if $(boards), \ + $(foreach b, $(boards), \ + printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ + echo '') + @$(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 '') + + @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' + @echo ' make V=2 [targets] 2 => give reason for rebuild of target' + @echo ' make O=dir [targets] Locate all output files in "dir", including .config' + @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)' + @echo ' make C=2 [targets] Force check of all c source with $$CHECK' + @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' + @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' + @echo ' Multiple levels can be combined with W=12 or W=123' + @echo '' + @echo 'Execute "make" or "make all" to build all targets marked with [*] ' + @echo 'For further info see the ./README file' + + +help-board-dirs := $(addprefix help-,$(board-dirs)) + +help-boards: $(help-board-dirs) + +boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))) + +$(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 '') + + +# Documentation targets +# --------------------------------------------------------------------------- +DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \ + linkcheckdocs dochelp refcheckdocs +PHONY += $(DOC_TARGETS) +$(DOC_TARGETS): scripts_basic FORCE + $(Q)$(MAKE) $(build)=Documentation $@ + +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 +# Install the modules built in the module directory +# Assumes install directory is already created + +# We are always building modules +KBUILD_MODULES := 1 + +PHONY += $(objtree)/Module.symvers +$(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)) +PHONY += $(module-dirs) modules +$(module-dirs): prepare $(objtree)/Module.symvers + $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@) + +modules: $(module-dirs) + @$(kecho) ' Building modules, stage 2.'; + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost + +PHONY += modules_install +modules_install: _emodinst_ _emodinst_post + +install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra) +PHONY += _emodinst_ +_emodinst_: + $(Q)mkdir -p $(MODLIB)/$(install-dir) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst + +PHONY += _emodinst_post +_emodinst_post: _emodinst_ + $(call cmd,depmod) + +clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD)) + +PHONY += $(clean-dirs) clean +$(clean-dirs): + $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) + +clean: rm-dirs := $(MODVERDIR) +clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers + +PHONY += help +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 '' + +# Dummies... +PHONY += prepare scripts +prepare: + $(cmd_crmodverdir) +scripts: ; +endif # KBUILD_EXTMOD + +clean: $(clean-dirs) + $(call cmd,rmdirs) + $(call cmd,rmfiles) + @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ + \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \ + -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \ + -o -name '*.dwo' -o -name '*.lst' \ + -o -name '*.su' \ + -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ + -o -name '*.lex.c' -o -name '*.tab.[ch]' \ + -o -name '*.asn1.[ch]' \ + -o -name '*.symtypes' -o -name 'modules.order' \ + -o -name modules.builtin -o -name '.tmp_*.o.*' \ + -o -name '*.c.[012]*.*' \ + -o -name '*.ll' \ + -o -name '*.gcno' \) -type f -print | xargs rm -f + +# Generate tags for editors +# --------------------------------------------------------------------------- +quiet_cmd_tags = GEN $@ + cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ + +tags TAGS cscope gtags: FORCE + $(call cmd,tags) + +# Scripts to check various things for consistency +# --------------------------------------------------------------------------- + +PHONY += includecheck versioncheck coccicheck namespacecheck export_report + +includecheck: + find $(srctree)/* $(RCS_FIND_IGNORE) \ + -name '*.[hcS]' -type f -print | sort \ + | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl + +versioncheck: + find $(srctree)/* $(RCS_FIND_IGNORE) \ + -name '*.[hcS]' -type f -print | sort \ + | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl + +coccicheck: + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@ + +namespacecheck: + $(PERL) $(srctree)/scripts/namespace.pl + +export_report: + $(PERL) $(srctree)/scripts/export_report.pl + +endif #ifeq ($(config-targets),1) +endif #ifeq ($(mixed-targets),1) + +PHONY += checkstack kernelrelease kernelversion image_name + +# 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 +checkstack: + $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ + $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH) + +kernelrelease: + @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" + +kernelversion: + @echo $(KERNELVERSION) + +image_name: + @echo $(KBUILD_IMAGE) + +# Clear a bunch of variables before executing the submake +tools/: FORCE + $(Q)mkdir -p $(objtree)/tools + $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ + +tools/%: FORCE + $(Q)mkdir -p $(objtree)/tools + $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $* + +# Single targets +# --------------------------------------------------------------------------- +# Single targets are compatible with: +# - build with mixed source and output +# - build with separate output dir 'make O=...' +# - external modules +# +# target-dir => where to store outputfile +# build-dir => directory in kernel source tree to use + +ifeq ($(KBUILD_EXTMOD),) + build-dir = $(patsubst %/,%,$(dir $@)) + 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 + +%.s: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.i: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.o: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.lst: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.s: %.S prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.o: %.S prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.symtypes: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) +%.ll: %.c prepare scripts FORCE + $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) + +# Modules +/: prepare scripts FORCE + $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ + $(build)=$(build-dir) +# Make sure the latest headers are built for Documentation +Documentation/ samples/: headers_install +%/: prepare scripts FORCE + $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ + $(build)=$(build-dir) +%.ko: prepare scripts FORCE + $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ + $(build)=$(build-dir) $(@:.ko=.o) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost + +# FIXME Should go into a make.lib or something +# =========================================================================== + +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) + +# Run depmod only if we have System.map and depmod is executable +quiet_cmd_depmod = DEPMOD $(KERNELRELEASE) + cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ + $(KERNELRELEASE) + +# Create temporary dir for module support files +# clean it up only when building all modules +cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \ + $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*) + +# read all saved command lines + +cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) + +ifneq ($(cmd_files),) + $(cmd_files): ; # Do not try to update included dependency files + include $(cmd_files) +endif + +endif # skip-makefile + +PHONY += FORCE +FORCE: + +# Declare the contents of the PHONY variable as phony. We keep that +# information in a variable so we can use it in if_changed and friends. +.PHONY: $(PHONY) |