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Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 2144 |
1 files changed, 2144 insertions, 0 deletions
diff --git a/Makefile b/Makefile new file mode 100644 index 000000000..9dd167178 --- /dev/null +++ b/Makefile @@ -0,0 +1,2144 @@ +# SPDX-License-Identifier: GPL-2.0 +VERSION = 6 +PATCHLEVEL = 1 +SUBLEVEL = 76 +EXTRAVERSION = +NAME = Curry Ramen + +# *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. + +$(if $(filter __%, $(MAKECMDGOALS)), \ + $(error targets prefixed with '__' are only for internal use)) + +# That's our default target when none is given on the command line +PHONY := __all +__all: + +# We are using a recursive build, so we need to do a little thinking +# to get the ordering right. +# +# Most importantly: sub-Makefiles should only ever modify files in +# their own directory. If in some directory we have a dependency on +# a file in another dir (which doesn't happen often, but it's often +# unavoidable when linking the built-in.a targets which finally +# turn into vmlinux), we will call a sub make in that other dir, and +# after that we are sure that everything which is in that other dir +# is now up to date. +# +# The only cases where we need to modify files which have global +# effects are thus separated out and done before the recursive +# descending is started. They are now explicitly listed as the +# prepare rule. + +ifneq ($(sub_make_done),1) + +# Do not use make's built-in rules and variables +# (this increases performance and avoids hard-to-debug behaviour) +MAKEFLAGS += -rR + +# 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 + +# 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 $@ :< +# +# If KBUILD_VERBOSE equals 0 then the above command will be hidden. +# If KBUILD_VERBOSE equals 1 then the above command is displayed. +# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt. +# +# To put more focus on warnings, be less verbose as default +# Use 'make V=1' to see the full commands + +ifeq ("$(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 +# make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. + +ifeq ($(filter 3.%,$(MAKE_VERSION)),) +silence:=$(findstring s,$(firstword -$(MAKEFLAGS))) +else +silence:=$(findstring s,$(filter-out --%,$(MAKEFLAGS))) +endif + +ifeq ($(silence),s) +quiet=silent_ +KBUILD_VERBOSE = 0 +endif + +export quiet Q KBUILD_VERBOSE + +# Call a source code checker (by default, "sparse") as part of the +# C compilation. +# +# Use 'make C=1' to enable checking of only re-compiled files. +# Use 'make C=2' to enable checking of *all* source files, regardless +# of whether they are re-compiled or not. +# +# See the file "Documentation/dev-tools/sparse.rst" for more details, +# including where to get the "sparse" utility. + +ifeq ("$(origin C)", "command line") + KBUILD_CHECKSRC = $(C) +endif +ifndef KBUILD_CHECKSRC + KBUILD_CHECKSRC = 0 +endif + +export KBUILD_CHECKSRC + +# Enable "clippy" (a linter) as part of the Rust compilation. +# +# Use 'make CLIPPY=1' to enable it. +ifeq ("$(origin CLIPPY)", "command line") + KBUILD_CLIPPY := $(CLIPPY) +endif + +export KBUILD_CLIPPY + +# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the +# directory of external module to build. Setting M= takes precedence. +ifeq ("$(origin M)", "command line") + KBUILD_EXTMOD := $(M) +endif + +$(if $(word 2, $(KBUILD_EXTMOD)), \ + $(error building multiple external modules is not supported)) + +$(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \ + $(error module directory path cannot contain '$x'))) + +# Remove trailing slashes +ifneq ($(filter %/, $(KBUILD_EXTMOD)),) +KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).) +endif + +export KBUILD_EXTMOD + +# Kbuild will save output files in the current working directory. +# This does not need to match to the root of the kernel source tree. +# +# For example, you can do this: +# +# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile +# +# If you want to save output files in a different location, there are +# two syntaxes to specify it. +# +# 1) O= +# Use "make O=dir/to/store/output/files/" +# +# 2) Set KBUILD_OUTPUT +# Set the environment variable KBUILD_OUTPUT to point to the output directory. +# export KBUILD_OUTPUT=dir/to/store/output/files/; make +# +# The O= assignment takes precedence over the KBUILD_OUTPUT environment +# variable. + +# Do we want to change the working directory? +ifeq ("$(origin O)", "command line") + KBUILD_OUTPUT := $(O) +endif + +ifneq ($(KBUILD_OUTPUT),) +# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot +# expand a shell special character '~'. We use a somewhat tedious way here. +abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd) +$(if $(abs_objtree),, \ + $(error failed to create output directory "$(KBUILD_OUTPUT)")) + +# $(realpath ...) resolves symlinks +abs_objtree := $(realpath $(abs_objtree)) +else +abs_objtree := $(CURDIR) +endif # ifneq ($(KBUILD_OUTPUT),) + +ifeq ($(abs_objtree),$(CURDIR)) +# Suppress "Entering directory ..." unless we are changing the work directory. +MAKEFLAGS += --no-print-directory +else +need-sub-make := 1 +endif + +this-makefile := $(lastword $(MAKEFILE_LIST)) +abs_srctree := $(realpath $(dir $(this-makefile))) + +ifneq ($(words $(subst :, ,$(abs_srctree))), 1) +$(error source directory cannot contain spaces or colons) +endif + +ifneq ($(abs_srctree),$(abs_objtree)) +# Look for make include files relative to root of kernel src +# +# --included-dir is added for backward compatibility, but you should not rely on +# it. Please add $(srctree)/ prefix to include Makefiles in the source tree. +MAKEFLAGS += --include-dir=$(abs_srctree) +endif + +ifneq ($(filter 3.%,$(MAKE_VERSION)),) +# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x +# We need to invoke sub-make to avoid implicit rules in the top Makefile. +need-sub-make := 1 +# Cancel implicit rules for this Makefile. +$(this-makefile): ; +endif + +export abs_srctree abs_objtree +export sub_make_done := 1 + +ifeq ($(need-sub-make),1) + +PHONY += $(MAKECMDGOALS) __sub-make + +$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make + @: + +# Invoke a second make in the output directory, passing relevant variables +__sub-make: + $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS) + +endif # need-sub-make +endif # sub_make_done + +# We process the rest of the Makefile if this is the final invocation of make +ifeq ($(need-sub-make),) + +# 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 + +ifeq ($(abs_srctree),$(abs_objtree)) + # building in the source tree + srctree := . + building_out_of_srctree := +else + ifeq ($(abs_srctree)/,$(dir $(abs_objtree))) + # building in a subdirectory of the source tree + srctree := .. + else + srctree := $(abs_srctree) + endif + building_out_of_srctree := 1 +endif + +ifneq ($(KBUILD_ABS_SRCTREE),) +srctree := $(abs_srctree) +endif + +objtree := . +VPATH := $(srctree) + +export building_out_of_srctree 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 + +clean-targets := %clean mrproper cleandocs +no-dot-config-targets := $(clean-targets) \ + cscope gtags TAGS tags help% %docs check% coccicheck \ + $(version_h) headers headers_% archheaders archscripts \ + %asm-generic kernelversion %src-pkg dt_binding_check \ + outputmakefile rustavailable rustfmt rustfmtcheck +# Installation targets should not require compiler. Unfortunately, vdso_install +# is an exception where build artifacts may be updated. This must be fixed. +no-compiler-targets := $(no-dot-config-targets) install dtbs_install \ + headers_install modules_install kernelrelease image_name +no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \ + image_name +single-targets := %.a %.i %.rsi %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/ + +config-build := +mixed-build := +need-config := 1 +need-compiler := 1 +may-sync-config := 1 +single-build := + +ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) + ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) + need-config := + endif +endif + +ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),) + ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),) + need-compiler := + endif +endif + +ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) + ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) + may-sync-config := + endif +endif + +ifneq ($(KBUILD_EXTMOD),) + may-sync-config := +endif + +ifeq ($(KBUILD_EXTMOD),) + ifneq ($(filter %config,$(MAKECMDGOALS)),) + config-build := 1 + ifneq ($(words $(MAKECMDGOALS)),1) + mixed-build := 1 + endif + endif +endif + +# We cannot build single targets and the others at the same time +ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),) + single-build := 1 + ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),) + mixed-build := 1 + endif +endif + +# For "make -j clean all", "make -j mrproper defconfig all", etc. +ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),) + ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),) + mixed-build := 1 + endif +endif + +# install and modules_install need also be processed one by one +ifneq ($(filter install,$(MAKECMDGOALS)),) + ifneq ($(filter modules_install,$(MAKECMDGOALS)),) + mixed-build := 1 + endif +endif + +ifdef mixed-build +# =========================================================================== +# We're called with mixed targets (*config and build targets). +# Handle them one by one. + +PHONY += $(MAKECMDGOALS) __build_one_by_one + +$(MAKECMDGOALS): __build_one_by_one + @: + +__build_one_by_one: + $(Q)set -e; \ + for i in $(MAKECMDGOALS); do \ + $(MAKE) -f $(srctree)/Makefile $$i; \ + done + +else # !mixed-build + +include $(srctree)/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 $(srctree)/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 ($(ARCH),sparc64) + SRCARCH := sparc +endif + +# Additional ARCH settings for parisc +ifeq ($(ARCH),parisc64) + SRCARCH := parisc +endif + +export cross_compiling := +ifneq ($(SRCARCH),$(SUBARCH)) +cross_compiling := 1 +endif + +KCONFIG_CONFIG ?= .config +export KCONFIG_CONFIG + +# SHELL used by kbuild +CONFIG_SHELL := sh + +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),) +ifneq ($(filter %/,$(LLVM)),) +LLVM_PREFIX := $(LLVM) +else ifneq ($(filter -%,$(LLVM)),) +LLVM_SUFFIX := $(LLVM) +endif + +HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) +HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX) +else +HOSTCC = gcc +HOSTCXX = g++ +endif +HOSTRUSTC = rustc +HOSTPKG_CONFIG = pkg-config + +KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ + -O2 -fomit-frame-pointer -std=gnu11 \ + -Wdeclaration-after-statement +KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS) +KBUILD_USERLDFLAGS := $(USERLDFLAGS) + +# These flags apply to all Rust code in the tree, including the kernel and +# host programs. +export rust_common_flags := --edition=2021 \ + -Zbinary_dep_depinfo=y \ + -Dunsafe_op_in_unsafe_fn -Drust_2018_idioms \ + -Dunreachable_pub -Dnon_ascii_idents \ + -Wmissing_docs \ + -Drustdoc::missing_crate_level_docs \ + -Dclippy::correctness -Dclippy::style \ + -Dclippy::suspicious -Dclippy::complexity \ + -Dclippy::perf \ + -Dclippy::let_unit_value -Dclippy::mut_mut \ + -Dclippy::needless_bitwise_bool \ + -Dclippy::needless_continue \ + -Wclippy::dbg_macro + +KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS) +KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) +KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ + -Zallow-features= $(HOSTRUSTFLAGS) +KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) +KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) + +# Make variables (CC, etc...) +CPP = $(CC) -E +ifneq ($(LLVM),) +CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX) +LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX) +AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX) +NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX) +OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX) +OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX) +READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX) +STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX) +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 +STRIP = $(CROSS_COMPILE)strip +endif +RUSTC = rustc +RUSTDOC = rustdoc +RUSTFMT = rustfmt +CLIPPY_DRIVER = clippy-driver +BINDGEN = bindgen +CARGO = cargo +PAHOLE = pahole +RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids +LEX = flex +YACC = bison +AWK = awk +INSTALLKERNEL := installkernel +DEPMOD = depmod +PERL = perl +PYTHON3 = python3 +CHECK = sparse +BASH = bash +KGZIP = gzip +KBZIP2 = bzip2 +KLZOP = lzop +LZMA = lzma +LZ4 = lz4c +XZ = xz +ZSTD = zstd + +PAHOLE_FLAGS = $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh) + +CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \ + -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF) +NOSTDINC_FLAGS := +CFLAGS_MODULE = +RUSTFLAGS_MODULE = +AFLAGS_MODULE = +LDFLAGS_MODULE = +CFLAGS_KERNEL = +RUSTFLAGS_KERNEL = +AFLAGS_KERNEL = +LDFLAGS_vmlinux = + +# Use USERINCLUDE when you must reference the UAPI directories only. +USERINCLUDE := \ + -I$(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/compiler-version.h \ + -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 $(building_out_of_srctree),-I$(srctree)/include) \ + -I$(objtree)/include \ + $(USERINCLUDE) + +KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE +KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \ + -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \ + -Werror=implicit-function-declaration -Werror=implicit-int \ + -Werror=return-type -Wno-format-security \ + -std=gnu11 +KBUILD_CPPFLAGS := -D__KERNEL__ +KBUILD_RUSTFLAGS := $(rust_common_flags) \ + --target=$(objtree)/rust/target.json \ + -Cpanic=abort -Cembed-bitcode=n -Clto=n \ + -Cforce-unwind-tables=n -Ccodegen-units=1 \ + -Csymbol-mangling-version=v0 \ + -Crelocation-model=static \ + -Zfunction-sections=n \ + -Dclippy::float_arithmetic + +KBUILD_AFLAGS_KERNEL := +KBUILD_CFLAGS_KERNEL := +KBUILD_RUSTFLAGS_KERNEL := +KBUILD_AFLAGS_MODULE := -DMODULE +KBUILD_CFLAGS_MODULE := -DMODULE +KBUILD_RUSTFLAGS_MODULE := --cfg MODULE +KBUILD_LDFLAGS_MODULE := +KBUILD_LDFLAGS := +CLANG_FLAGS := + +ifeq ($(KBUILD_CLIPPY),1) + RUSTC_OR_CLIPPY_QUIET := CLIPPY + RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) +else + RUSTC_OR_CLIPPY_QUIET := RUSTC + RUSTC_OR_CLIPPY = $(RUSTC) +endif + +ifdef RUST_LIB_SRC + export RUST_LIB_SRC +endif + +# Allows the usage of unstable features in stable compilers. +export RUSTC_BOOTSTRAP := 1 + +export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG +export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN CARGO +export HOSTRUSTC KBUILD_HOSTRUSTFLAGS +export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL +export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX +export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD +export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE +export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS + +export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS +export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE +export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE +export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE +export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE +export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL +export PAHOLE_FLAGS + +# 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 + +PHONY += outputmakefile +ifdef building_out_of_srctree +# Before starting out-of-tree build, make sure the source tree is clean. +# outputmakefile generates a Makefile in the output directory, if using a +# separate output directory. This allows convenient use of make in the +# output directory. +# At the same time when output Makefile generated, generate .gitignore to +# ignore whole output directory + +quiet_cmd_makefile = GEN Makefile + cmd_makefile = { \ + echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \ + echo "include $(srctree)/Makefile"; \ + } > Makefile + +outputmakefile: + @if [ -f $(srctree)/.config -o \ + -d $(srctree)/include/config -o \ + -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \ + echo >&2 "***"; \ + echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \ + echo >&2 "*** in $(abs_srctree)";\ + echo >&2 "***"; \ + false; \ + fi + $(Q)ln -fsn $(srctree) source + $(call cmd,makefile) + $(Q)test -e .gitignore || \ + { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore +endif + +# The expansion should be delayed until arch/$(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 = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) + +ifneq ($(findstring clang,$(CC_VERSION_TEXT)),) +include $(srctree)/scripts/Makefile.clang +endif + +# Include this also for config targets because some architectures need +# cc-cross-prefix to determine CROSS_COMPILE. +ifdef need-compiler +include $(srctree)/scripts/Makefile.compiler +endif + +ifdef config-build +# =========================================================================== +# *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 $(srctree)/arch/$(SRCARCH)/Makefile +export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT + +config: outputmakefile scripts_basic FORCE + $(Q)$(MAKE) $(build)=scripts/kconfig $@ + +%config: outputmakefile scripts_basic FORCE + $(Q)$(MAKE) $(build)=scripts/kconfig $@ + +else #!config-build +# =========================================================================== +# Build targets only - this includes vmlinux, arch specific targets, clean +# targets and others. In general all targets except *config targets. + +# If building an external module we do not care about the all: rule +# but instead __all depend on modules +PHONY += all +ifeq ($(KBUILD_EXTMOD),) +__all: all +else +__all: modules +endif + +targets := + +# 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 modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),) + KBUILD_MODULES := 1 +endif + +ifeq ($(MAKECMDGOALS),) + KBUILD_MODULES := 1 +endif + +export KBUILD_MODULES KBUILD_BUILTIN + +ifdef need-config +include include/config/auto.conf +endif + +ifeq ($(KBUILD_EXTMOD),) +# Objects we will link into vmlinux / subdirs we need to visit +core-y := +drivers-y := +libs-y := lib/ +endif # KBUILD_EXTMOD + +# 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 +ifdef CONFIG_CC_IS_GCC +CFLAGS_GCOV += -fno-tree-loop-im +endif +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 + +include $(srctree)/arch/$(SRCARCH)/Makefile + +ifdef need-config +ifdef may-sync-config +# Read in dependencies to all Kconfig* files, make sure to run syncconfig if +# changes are detected. This should be included after arch/$(SRCARCH)/Makefile +# because some architectures define CROSS_COMPILE there. +include include/config/auto.conf.cmd + +$(KCONFIG_CONFIG): + @echo >&2 '***' + @echo >&2 '*** Configuration file "$@" not found!' + @echo >&2 '***' + @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or' + @echo >&2 '*** "make menuconfig" or "make xconfig").' + @echo >&2 '***' + @/bin/false + +# 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. +# (Note: use the grouped target '&:' when we bump to GNU Make 4.3) +# +# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig, +# so you cannot notice that Kconfig is waiting for the user input. +%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG) + $(Q)$(kecho) " SYNC $@" + $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig +else # !may-sync-config +# 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: + @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 # need-config + +KBUILD_CFLAGS += -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 += $(call cc-disable-warning, address-of-packed-member) + +ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE +KBUILD_CFLAGS += -O2 +KBUILD_RUSTFLAGS += -Copt-level=2 +else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE +KBUILD_CFLAGS += -Os +KBUILD_RUSTFLAGS += -Copt-level=s +endif + +# Always set `debug-assertions` and `overflow-checks` because their default +# depends on `opt-level` and `debug-assertions`, respectively. +KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n) +KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n) + +# Tell gcc to never replace conditional load with a non-conditional one +ifdef CONFIG_CC_IS_GCC +# gcc-10 renamed --param=allow-store-data-races=0 to +# -fno-allow-store-data-races. +KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0) +KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races) +endif + +ifdef CONFIG_READABLE_ASM +# Disable optimizations that make assembler listings hard to read. +# reorder blocks reorders the control in the function +# ipa clone creates specialized cloned functions +# partial inlining inlines only parts of functions +KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining +endif + +ifneq ($(CONFIG_FRAME_WARN),0) +KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN) +endif + +stackp-flags-y := -fno-stack-protector +stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector +stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong + +KBUILD_CFLAGS += $(stackp-flags-y) + +KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror +KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds + +KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings +KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y) + +ifdef CONFIG_CC_IS_CLANG +KBUILD_CPPFLAGS += -Qunused-arguments +# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable. +KBUILD_CFLAGS += -Wno-gnu +else + +# gcc inanely warns about local variables called 'main' +KBUILD_CFLAGS += -Wno-main +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) + +# These result in bogus false positives +KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer) + +ifdef CONFIG_FRAME_POINTER +KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls +KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y +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. +# In the Rust target specification, "frame-pointer" is set explicitly +# to "may-omit". +ifndef CONFIG_FUNCTION_TRACER +KBUILD_CFLAGS += -fomit-frame-pointer +endif +endif + +# Initialize all stack variables with a 0xAA pattern. +ifdef CONFIG_INIT_STACK_ALL_PATTERN +KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern +endif + +# Initialize all stack variables with a zero value. +ifdef CONFIG_INIT_STACK_ALL_ZERO +KBUILD_CFLAGS += -ftrivial-auto-var-init=zero +ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER +# https://github.com/llvm/llvm-project/issues/44842 +KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang +endif +endif + +# While VLAs have been removed, GCC produces unreachable stack probes +# for the randomize_kstack_offset feature. Disable it for all compilers. +KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection) + +# Clear used registers at func exit (to reduce data lifetime and ROP gadgets). +ifdef CONFIG_ZERO_CALL_USED_REGS +KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr +endif + +ifdef CONFIG_FUNCTION_TRACER +ifdef CONFIG_FTRACE_MCOUNT_USE_CC + CC_FLAGS_FTRACE += -mrecord-mcount + ifdef CONFIG_HAVE_NOP_MCOUNT + ifeq ($(call cc-option-yn, -mnop-mcount),y) + CC_FLAGS_FTRACE += -mnop-mcount + CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT + endif + endif +endif +ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL + CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT +endif +ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT + ifdef CONFIG_HAVE_C_RECORDMCOUNT + BUILD_C_RECORDMCOUNT := y + export BUILD_C_RECORDMCOUNT + endif +endif +ifdef CONFIG_HAVE_FENTRY + # s390-linux-gnu-gcc did not support -mfentry until gcc-9. + 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) +endif + +# We trigger additional mismatches with less inlining +ifdef CONFIG_DEBUG_SECTION_MISMATCH +KBUILD_CFLAGS += -fno-inline-functions-called-once +endif + +# `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0). +ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION +KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections +KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y +LDFLAGS_vmlinux += --gc-sections +endif + +ifdef CONFIG_SHADOW_CALL_STACK +CC_FLAGS_SCS := -fsanitize=shadow-call-stack +KBUILD_CFLAGS += $(CC_FLAGS_SCS) +export CC_FLAGS_SCS +endif + +ifdef CONFIG_LTO_CLANG +ifdef CONFIG_LTO_CLANG_THIN +CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit +KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache +else +CC_FLAGS_LTO := -flto +endif +CC_FLAGS_LTO += -fvisibility=hidden + +# Limit inlining across translation units to reduce binary size +KBUILD_LDFLAGS += -mllvm -import-instr-limit=5 + +# Check for frame size exceeding threshold during prolog/epilog insertion +# when using lld < 13.0.0. +ifneq ($(CONFIG_FRAME_WARN),0) +ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0) +KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN) +endif +endif +endif + +ifdef CONFIG_LTO +KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) +KBUILD_AFLAGS += -fno-lto +export CC_FLAGS_LTO +endif + +ifdef CONFIG_CFI_CLANG +CC_FLAGS_CFI := -fsanitize=kcfi +KBUILD_CFLAGS += $(CC_FLAGS_CFI) +export CC_FLAGS_CFI +endif + +ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B +KBUILD_CFLAGS += -falign-functions=64 +endif + +# arch Makefile may override CC so keep this after arch Makefile is included +NOSTDINC_FLAGS += -nostdinc + +# warn about C99 declaration after statement +KBUILD_CFLAGS += -Wdeclaration-after-statement + +# Variable Length Arrays (VLAs) should not be used anywhere in the kernel +KBUILD_CFLAGS += -Wvla + +# disable pointer signed / unsigned warnings in gcc 4.0 +KBUILD_CFLAGS += -Wno-pointer-sign + +# In order to make sure new function cast mismatches are not introduced +# in the kernel (to avoid tripping CFI checking), the kernel should be +# globally built with -Wcast-function-type. +KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type) + +# 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, 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 +ifdef CONFIG_CC_IS_GCC +KBUILD_CFLAGS += -Wno-maybe-uninitialized +endif + +# The allocators already balk at large sizes, so silence the compiler +# warnings for bounds checks involving those possible values. While +# -Wno-alloc-size-larger-than would normally be used here, earlier versions +# of gcc (<9.1) weirdly don't handle the option correctly when _other_ +# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX +# doesn't work (as it is documented to), silently resolving to "0" prior to +# version 9.1 (and producing an error more recently). Numeric values larger +# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently +# ignored, continuing to default to PTRDIFF_MAX. So, left with no other +# choice, we must perform a versioned check to disable this warning. +# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au +KBUILD_CFLAGS-$(call gcc-min-version, 90100) += -Wno-alloc-size-larger-than +KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH) + +# disable invalid "can't wrap" optimizations for signed / pointers +KBUILD_CFLAGS += -fno-strict-overflow + +# Make sure -fstack-check isn't enabled (like gentoo apparently did) +KBUILD_CFLAGS += -fno-stack-check + +# conserve stack if available +ifdef CONFIG_CC_IS_GCC +KBUILD_CFLAGS += -fconserve-stack +endif + +# Prohibit date/time macros, which would make the build non-deterministic +KBUILD_CFLAGS += -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_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=) + +# include additional Makefiles when needed +include-y := scripts/Makefile.extrawarn +include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug +include-$(CONFIG_KASAN) += scripts/Makefile.kasan +include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan +include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan +include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan +include-$(CONFIG_KCOV) += scripts/Makefile.kcov +include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct +include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins + +include $(addprefix $(srctree)/, $(include-y)) + +# scripts/Makefile.gcc-plugins is intentionally included last. +# Do not add $(call cc-option,...) below this line. When you build the kernel +# from the clean source tree, the GCC plugins do not exist at this point. + +# Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments +KBUILD_CPPFLAGS += $(KCPPFLAGS) +KBUILD_AFLAGS += $(KAFLAGS) +KBUILD_CFLAGS += $(KCFLAGS) +KBUILD_RUSTFLAGS += $(KRUSTFLAGS) + +KBUILD_LDFLAGS_MODULE += --build-id=sha1 +LDFLAGS_vmlinux += --build-id=sha1 + +KBUILD_LDFLAGS += -z noexecstack +ifeq ($(CONFIG_LD_IS_BFD),y) +KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments) +endif + +ifeq ($(CONFIG_STRIP_ASM_SYMS),y) +LDFLAGS_vmlinux += -X +endif + +ifeq ($(CONFIG_RELR),y) +LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags +endif + +# We never want expected sections to be placed heuristically by the +# linker. All sections should be explicitly named in the linker script. +ifdef CONFIG_LD_ORPHAN_WARN +LDFLAGS_vmlinux += --orphan-handling=warn +endif + +# Align the bit size of userspace programs with the kernel +KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) +KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS)) + +# make the checker run with the right architecture +CHECKFLAGS += --arch=$(ARCH) + +# 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 + +PHONY += prepare0 + +export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/) +export MODORDER := $(extmod_prefix)modules.order +export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps + +ifeq ($(KBUILD_EXTMOD),) + +build-dir := . +clean-dirs := $(sort . Documentation \ + $(patsubst %/,%,$(filter %/, $(core-) \ + $(drivers-) $(libs-)))) + +export ARCH_CORE := $(core-y) +export ARCH_LIB := $(filter %/, $(libs-y)) +export ARCH_DRIVERS := $(drivers-y) $(drivers-m) +# Externally visible symbols (used by link-vmlinux.sh) + +KBUILD_VMLINUX_OBJS := ./built-in.a +ifdef CONFIG_MODULES +KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) +KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) +else +KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y)) +endif + +export KBUILD_VMLINUX_LIBS +export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds + +# Recurse until adjust_autoksyms.sh is satisfied +PHONY += autoksyms_recursive +ifdef CONFIG_TRIM_UNUSED_KSYMS +# 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) +KBUILD_MODULES := 1 + +autoksyms_recursive: $(build-dir) modules.order + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \ + "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive" +endif + +autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h) + +quiet_cmd_autoksyms_h = GEN $@ + cmd_autoksyms_h = mkdir -p $(dir $@); \ + $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@ + +$(autoksyms_h): + $(call cmd,autoksyms_h) + +# '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14 +quiet_cmd_ar_vmlinux.a = AR $@ + cmd_ar_vmlinux.a = \ + rm -f $@; \ + $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \ + $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt) + +targets += vmlinux.a +vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt autoksyms_recursive FORCE + $(call if_changed,ar_vmlinux.a) + +PHONY += vmlinux_o +vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o + +vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o + @: + +PHONY += vmlinux +# LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux, +# not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is +# unrelated; the decompressors just happen to have the same base name, +# arch/*/boot/compressed/vmlinux. +# Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux. +# +# _LDFLAGS_vmlinux is a workaround for the 'private export' bug: +# https://savannah.gnu.org/bugs/?61463 +# For Make > 4.4, the following simple code will work: +# vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) +vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux) +vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux) +vmlinux: vmlinux.o $(KBUILD_LDS) modpost + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux + +# The actual objects are generated when descending, +# make sure no implicit rule kicks in +$(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ; + +filechk_kernel.release = \ + echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" + +# Store (new) KERNELRELEASE string in include/config/kernel.release +include/config/kernel.release: 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 scripts_dtc + $(Q)$(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 + +archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \ + asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \ + include/generated/compile.h include/generated/autoconf.h remove-stale-files + +prepare0: archprepare + $(Q)$(MAKE) $(build)=scripts/mod + $(Q)$(MAKE) $(build)=. prepare + +# All the preparing.. +prepare: prepare0 +ifdef CONFIG_RUST + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh + $(Q)$(MAKE) $(build)=rust +endif + +PHONY += remove-stale-files +remove-stale-files: + $(Q)$(srctree)/scripts/remove-stale-files + +# Support for using generic headers in asm-generic +asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj + +PHONY += asm-generic uapi-asm-generic +asm-generic: uapi-asm-generic + $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \ + generic=include/asm-generic +uapi-asm-generic: + $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \ + generic=include/uapi/asm-generic + +# 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 + if [ $(SUBLEVEL) -gt 255 ]; then \ + echo \#define LINUX_VERSION_CODE $(shell \ + expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \ + else \ + echo \#define LINUX_VERSION_CODE $(shell \ + expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ + fi; \ + echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \ + ((c) > 255 ? 255 : (c)))'; \ + echo \#define LINUX_VERSION_MAJOR $(VERSION); \ + echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \ + echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL) +endef + +$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0) +$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0) +$(version_h): FORCE + $(call filechk,version.h) + +include/generated/utsrelease.h: include/config/kernel.release FORCE + $(call filechk,utsrelease.h) + +filechk_compile.h = $(srctree)/scripts/mkcompile_h \ + "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)" + +include/generated/compile.h: FORCE + $(call filechk,compile.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 + +quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include + cmd_headers_install = \ + mkdir -p $(INSTALL_HDR_PATH); \ + rsync -mrl --include='*/' --include='*\.h' --exclude='*' \ + usr/include $(INSTALL_HDR_PATH) + +PHONY += headers_install +headers_install: headers + $(call cmd,headers_install) + +PHONY += archheaders archscripts + +hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj + +PHONY += headers +headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts + $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML)) + $(Q)$(MAKE) $(hdr-inst)=include/uapi + $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi + +ifdef CONFIG_HEADERS_INSTALL +prepare: headers +endif + +PHONY += scripts_unifdef +scripts_unifdef: scripts_basic + $(Q)$(MAKE) $(build)=scripts scripts/unifdef + +# --------------------------------------------------------------------------- +# Install + +# Many distributions have the custom install script, /sbin/installkernel. +# If DKMS is installed, 'make install' will eventually recurse back +# to this Makefile to build and install external modules. +# Cancel sub_make_done so that options such as M=, V=, etc. are parsed. + +quiet_cmd_install = INSTALL $(INSTALL_PATH) + cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh + +# --------------------------------------------------------------------------- +# Tools + +ifdef CONFIG_OBJTOOL +prepare: tools/objtool +endif + +ifdef CONFIG_BPF +ifdef CONFIG_DEBUG_INFO_BTF +prepare: tools/bpf/resolve_btfids +endif +endif + +PHONY += resolve_btfids_clean + +resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids + +# tools/bpf/resolve_btfids directory might not exist +# in output directory, skip its clean in that case +resolve_btfids_clean: +ifneq ($(wildcard $(resolve_btfids_O)),) + $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean +endif + +# Clear a bunch of variables before executing the submake +ifeq ($(quiet),silent_) +tools_silent=s +endif + +tools/: FORCE + $(Q)mkdir -p $(objtree)/tools + $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ + +tools/%: FORCE + $(Q)mkdir -p $(objtree)/tools + $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $* + +# --------------------------------------------------------------------------- +# Kernel selftest + +PHONY += kselftest +kselftest: headers + $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests + +kselftest-%: headers FORCE + $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $* + +PHONY += kselftest-merge +kselftest-merge: + $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!)) + $(Q)find $(srctree)/tools/testing/selftests -name config | \ + xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config + $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig + +# --------------------------------------------------------------------------- +# Devicetree files + +ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) +dtstree := arch/$(SRCARCH)/boot/dts +endif + +ifneq ($(dtstree),) + +%.dtb: dtbs_prepare + $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ + +%.dtbo: dtbs_prepare + $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ + +PHONY += dtbs dtbs_prepare dtbs_install dtbs_check +dtbs: dtbs_prepare + $(Q)$(MAKE) $(build)=$(dtstree) + +# include/config/kernel.release is actually needed when installing DTBs because +# INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make +# dtbs_install depend on it as dtbs_install may run as root. +dtbs_prepare: include/config/kernel.release scripts_dtc + +ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),) +export CHECK_DTBS=y +dtbs: dt_binding_check +endif + +dtbs_check: dtbs + +dtbs_install: + $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH) + +ifdef CONFIG_OF_EARLY_FLATTREE +all: dtbs +endif + +endif + +PHONY += scripts_dtc +scripts_dtc: scripts_basic + $(Q)$(MAKE) $(build)=scripts/dtc + +ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) +export CHECK_DT_BINDING=y +endif + +PHONY += dt_binding_check +dt_binding_check: scripts_dtc + $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings + +PHONY += dt_compatible_check +dt_compatible_check: dt_binding_check + $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@ + +# --------------------------------------------------------------------------- +# 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 +# + +# *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFOBTF_MODULES +# is an exception. +ifdef CONFIG_DEBUG_INFO_BTF_MODULES +KBUILD_BUILTIN := 1 +modules: vmlinux +endif + +modules: modules_prepare + +# Target to prepare building external modules +modules_prepare: prepare + $(Q)$(MAKE) $(build)=scripts scripts/module.lds + +export modules_sign_only := + +ifeq ($(CONFIG_MODULE_SIG),y) +PHONY += modules_sign +modules_sign: modules_install + @: + +# modules_sign is a subset of modules_install. +# 'make modules_install modules_sign' is equivalent to 'make modules_install'. +ifeq ($(filter modules_install,$(MAKECMDGOALS)),) +modules_sign_only := y +endif +endif + +modinst_pre := +ifneq ($(filter modules_install,$(MAKECMDGOALS)),) +modinst_pre := __modinst_pre +endif + +modules_install: $(modinst_pre) +PHONY += __modinst_pre +__modinst_pre: + @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 + @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order + @cp -f modules.builtin $(MODLIB)/ + @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/ + +endif # CONFIG_MODULES + +### +# Cleaning is done on three levels. +# make clean Delete most generated files +# Leave enough to build external modules +# make mrproper Delete the current configuration, and all generated files +# make distclean Remove editor backup files, patch leftover files and the like + +# Directories & files removed with 'make clean' +CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \ + modules.builtin modules.builtin.modinfo modules.nsdeps \ + compile_commands.json .thinlto-cache rust/test rust/doc \ + .vmlinux.objs .vmlinux.export.c + +# Directories & files removed with 'make mrproper' +MRPROPER_FILES += include/config include/generated \ + arch/$(SRCARCH)/include/generated .objdiff \ + debian snap tar-install \ + .config .config.old .version \ + Module.symvers \ + certs/signing_key.pem \ + certs/x509.genkey \ + vmlinux-gdb.py \ + *.spec \ + rust/target.json rust/libmacros.so + +# clean - Delete most, but leave enough to build external modules +# +clean: rm-files := $(CLEAN_FILES) + +PHONY += archclean vmlinuxclean + +vmlinuxclean: + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean + $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean) + +clean: archclean vmlinuxclean resolve_btfids_clean + +# mrproper - Delete all generated files, including .config +# +mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) +mrproper-dirs := $(addprefix _mrproper_,scripts) + +PHONY += $(mrproper-dirs) mrproper +$(mrproper-dirs): + $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) + +mrproper: clean $(mrproper-dirs) + $(call cmd,rmfiles) + @find . $(RCS_FIND_IGNORE) \ + \( -name '*.rmeta' \) \ + -type f -print | xargs rm -f + +# distclean +# +PHONY += distclean + +distclean: mrproper + @find . $(RCS_FIND_IGNORE) \ + \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ + -o -name '*.bak' -o -name '#*#' -o -name '*%' \ + -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \ + -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \ + -type f -print | xargs rm -f + + +# Packaging of the kernel to various formats +# --------------------------------------------------------------------------- + +%src-pkg: FORCE + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ +%pkg: include/config/kernel.release FORCE + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@ + +# 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 ' 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 ' headerdep - Detect inclusion cycles in headers' + @echo ' coccicheck - Check with Coccinelle' + @echo ' clang-analyzer - Check with clang static analyzer' + @echo ' clang-tidy - Check with clang-tidy' + @echo '' + @echo 'Tools:' + @echo ' nsdeps - Generate missing symbol namespace dependencies' + @echo '' + @echo 'Kernel selftest:' + @echo ' kselftest - Build and run kernel selftest' + @echo ' Build, install, and boot kernel before' + @echo ' running kselftest on it' + @echo ' Run as root for full coverage' + @echo ' kselftest-all - Build kernel selftest' + @echo ' kselftest-install - Build and install kernel selftest' + @echo ' kselftest-clean - Remove all generated kselftest files' + @echo ' kselftest-merge - Merge all the config dependencies of' + @echo ' kselftest to existing .config.' + @echo '' + @echo 'Rust targets:' + @echo ' rustavailable - Checks whether the Rust toolchain is' + @echo ' available and, if not, explains why.' + @echo ' rustfmt - Reformat all the Rust code in the kernel' + @echo ' rustfmtcheck - Checks if all the Rust code in the kernel' + @echo ' is formatted, printing a diff otherwise.' + @echo ' rustdoc - Generate Rust documentation' + @echo ' (requires kernel .config)' + @echo ' rusttest - Runs the Rust tests' + @echo ' (requires kernel .config; downloads external repos)' + @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file' + @echo ' (requires kernel .config)' + @echo ' dir/file.[os] - Build specified target only' + @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.' + @echo ' Run with RUSTFMT=n to skip reformatting if needed.' + @echo ' The output is not intended to be compilable.' + @echo ' dir/file.ll - Build the LLVM assembly file' + @echo '' + @$(if $(dtstree), \ + echo 'Devicetree:'; \ + echo '* dtbs - Build device tree blobs for enabled boards'; \ + echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \ + echo ' dt_binding_check - Validate device tree binding documents'; \ + echo ' dtbs_check - Validate device tree source files';\ + echo '') + + @echo 'Userspace tools targets:' + @echo ' use "make tools/help"' + @echo ' or "cd tools; make help"' + @echo '' + @echo 'Kernel packaging:' + @$(MAKE) -f $(srctree)/scripts/Makefile.package help + @echo '' + @echo 'Documentation targets:' + @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp + @echo '' + @echo 'Architecture specific targets ($(SRCARCH)):' + @$(or $(archhelp),\ + echo ' No architecture specific help defined for $(SRCARCH)') + @echo '' + @$(if $(boards), \ + $(foreach b, $(boards), \ + printf " %-27s - 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 $$CHECK' + @echo ' (sparse by default)' + @echo ' make C=2 [targets] Force check of all c source with $$CHECK' + @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections' + @echo ' make W=n [targets] Enable extra build 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 ' e: warnings are being treated as errors' + @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): + $(Q)$(MAKE) $(build)=Documentation $@ + + +# Rust targets +# --------------------------------------------------------------------------- + +# "Is Rust available?" target +PHONY += rustavailable +rustavailable: + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!" + +# Documentation target +# +# Using the singular to avoid running afoul of `no-dot-config-targets`. +PHONY += rustdoc +rustdoc: prepare + $(Q)$(MAKE) $(build)=rust $@ + +# Testing target +PHONY += rusttest +rusttest: prepare + $(Q)$(MAKE) $(build)=rust $@ + +# Formatting targets +PHONY += rustfmt rustfmtcheck + +# We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream. +# +# We match using absolute paths since `find` does not resolve them +# when matching, which is a problem when e.g. `srctree` is `..`. +# We `grep` afterwards in order to remove the directory entry itself. +rustfmt: + $(Q)find $(abs_srctree) -type f -name '*.rs' \ + -o -path $(abs_srctree)/rust/alloc -prune \ + -o -path $(abs_objtree)/rust/test -prune \ + | grep -Fv $(abs_srctree)/rust/alloc \ + | grep -Fv $(abs_objtree)/rust/test \ + | grep -Fv generated \ + | xargs $(RUSTFMT) $(rustfmt_flags) + +rustfmtcheck: rustfmt_flags = --check +rustfmtcheck: rustfmt + +# IDE support targets +PHONY += rust-analyzer +rust-analyzer: + $(Q)$(MAKE) $(build)=rust $@ + +# Misc +# --------------------------------------------------------------------------- + +PHONY += scripts_gdb +scripts_gdb: prepare0 + $(Q)$(MAKE) $(build)=scripts/gdb + $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py) + +ifdef CONFIG_GDB_SCRIPTS +all: scripts_gdb +endif + +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. + +# We are always building only modules. +KBUILD_BUILTIN := +KBUILD_MODULES := 1 + +build-dir := $(KBUILD_EXTMOD) + +compile_commands.json: $(extmod_prefix)compile_commands.json +PHONY += compile_commands.json + +clean-dirs := $(KBUILD_EXTMOD) +clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \ + $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache + +PHONY += prepare +# now expand this into a simple variable to reduce the cost of shell evaluations +prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) +prepare: + @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \ + echo >&2 "warning: the compiler differs from the one used to build the kernel"; \ + echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \ + echo >&2 " You are using: $(CC_VERSION_TEXT)"; \ + fi + +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 '' + +endif # KBUILD_EXTMOD + +# --------------------------------------------------------------------------- +# Modules + +PHONY += modules modules_install modules_prepare + +ifdef CONFIG_MODULES + +$(MODORDER): $(build-dir) + @: + +# KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. +# This is solely useful to speed up test compiles. +modules: modpost +ifneq ($(KBUILD_MODPOST_NOFINAL),1) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal +endif + +PHONY += modules_check +modules_check: $(MODORDER) + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< + +quiet_cmd_depmod = DEPMOD $(MODLIB) + cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \ + $(KERNELRELEASE) + +modules_install: + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst +ifndef modules_sign_only + $(call cmd,depmod) +endif + +else # CONFIG_MODULES + +# Modules not configured +# --------------------------------------------------------------------------- + +modules modules_install: + @echo >&2 '***' + @echo >&2 '*** The present kernel configuration has modules disabled.' + @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.' + @echo >&2 '*** to enable CONFIG_MODULES.' + @echo >&2 '***' + @exit 1 + +KBUILD_MODULES := + +endif # CONFIG_MODULES + +PHONY += modpost +modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \ + $(if $(KBUILD_MODULES), modules_check) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost + +# Single targets +# --------------------------------------------------------------------------- +# To build individual files in subdirectories, you can do like this: +# +# make foo/bar/baz.s +# +# The supported suffixes for single-target are listed in 'single-targets' +# +# To build only under specific subdirectories, you can do like this: +# +# make foo/bar/baz/ + +ifdef single-build + +# .ko is special because modpost is needed +single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS))) +single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \ + $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko))) + +$(single-ko): single_modules + @: +$(single-no-ko): $(build-dir) + @: + +# Remove MODORDER when done because it is not the real one. +PHONY += single_modules +single_modules: $(single-no-ko) modules_prepare + $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost +ifneq ($(KBUILD_MODPOST_NOFINAL),1) + $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal +endif + $(Q)rm -f $(MODORDER) + +single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) + +KBUILD_MODULES := 1 + +endif + +# 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 += $(build-dir) +$(build-dir): prepare + $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals) + +clean-dirs := $(addprefix _clean_, $(clean-dirs)) +PHONY += $(clean-dirs) clean +$(clean-dirs): + $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) + +clean: $(clean-dirs) + $(call cmd,rmfiles) + @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \ + \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ + -o -name '*.ko.*' \ + -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \ + -o -name '*.dwo' -o -name '*.lst' \ + -o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \ + -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ + -o -name '*.lex.c' -o -name '*.tab.[ch]' \ + -o -name '*.asn1.[ch]' \ + -o -name '*.symtypes' -o -name 'modules.order' \ + -o -name '.tmp_*' \ + -o -name '*.c.[012]*.*' \ + -o -name '*.ll' \ + -o -name '*.gcno' \ + -o -name '*.*.symversions' \) -type f -print | xargs rm -f + +# Generate tags for editors +# --------------------------------------------------------------------------- +quiet_cmd_tags = GEN $@ + cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ + +tags TAGS cscope gtags: FORCE + $(call cmd,tags) + +# Script to generate missing namespace dependencies +# --------------------------------------------------------------------------- + +PHONY += nsdeps +nsdeps: export KBUILD_NSDEPS=1 +nsdeps: modules + $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps + +# Clang Tooling +# --------------------------------------------------------------------------- + +quiet_cmd_gen_compile_commands = GEN $@ + cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs)) + +$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \ + $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ + $(if $(CONFIG_MODULES), $(MODORDER)) FORCE + $(call if_changed,gen_compile_commands) + +targets += $(extmod_prefix)compile_commands.json + +PHONY += clang-tidy clang-analyzer + +ifdef CONFIG_CC_IS_CLANG +quiet_cmd_clang_tools = CHECK $< + cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $< + +clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json + $(call cmd,clang_tools) +else +clang-tidy clang-analyzer: + @echo "$@ requires CC=clang" >&2 + @false +endif + +# Scripts to check various things for consistency +# --------------------------------------------------------------------------- + +PHONY += includecheck versioncheck coccicheck 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: + $(Q)$(BASH) $(srctree)/scripts/$@ + +export_report: + $(PERL) $(srctree)/scripts/export_report.pl + +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 $$(find . -name '*.ko') | \ + $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) + +kernelrelease: + @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" + +kernelversion: + @echo $(KERNELVERSION) + +image_name: + @echo $(KBUILD_IMAGE) + +quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) + cmd_rmfiles = rm -rf $(rm-files) + +# read saved command lines for existing targets +existing-targets := $(wildcard $(sort $(targets))) + +-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) + +endif # config-build +endif # mixed-build +endif # need-sub-make + +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) |