D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
usr
/
src
/
linux-headers-7.0.0-29
/
Filename :
Makefile
back
Copy
# SPDX-License-Identifier: GPL-2.0 VERSION = 7 PATCHLEVEL = 0 SUBLEVEL = 12 EXTRAVERSION = NAME = Baby Opossum Posse # *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. ifeq ($(filter output-sync,$(.FEATURES)),) $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION)) endif $(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. this-makefile := $(lastword $(MAKEFILE_LIST)) abs_srctree := $(realpath $(dir $(this-makefile))) abs_output := $(CURDIR) ifneq ($(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 # --------------------------------------------------------------------------- # # Most of build commands in Kbuild start with "cmd_". You can optionally define # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from # that command is printed by default. # # e.g.) # quiet_cmd_depmod = DEPMOD $(MODLIB) # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE) # # A simple variant is to prefix commands with $(Q) - that's useful # for commands that shall be hidden in non-verbose mode. # # $(Q)$(MAKE) $(build)=scripts/basic # # If KBUILD_VERBOSE contains 1, the whole command is echoed. # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed. # # To put more focus on warnings, be less verbose as default # Use 'make V=1' to see the full commands ifeq ("$(origin V)", "command line") KBUILD_VERBOSE = $(V) endif quiet = quiet_ Q = @ ifneq ($(findstring 1, $(KBUILD_VERBOSE)),) quiet = Q = endif # If the user is running make -s (silent mode), suppress echoing of # commands ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),) quiet=silent_ override KBUILD_VERBOSE := 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 := $(M) endif ifeq ("$(origin MO)", "command line") KBUILD_EXTMOD_OUTPUT := $(MO) 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 $(KBUILD_EXTMOD).) endif export KBUILD_EXTMOD ifeq ("$(origin W)", "command line") KBUILD_EXTRA_WARN := $(W) endif export KBUILD_EXTRA_WARN # Kbuild will save output files in the current working directory. # This does not need to match to the root of the kernel source tree. # # For example, you can do this: # # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile # # If you want to save output files in a different location, there are # two syntaxes to specify it. # # 1) O= # Use "make O=dir/to/store/output/files/" # # 2) Set KBUILD_OUTPUT # Set the environment variable KBUILD_OUTPUT to point to the output directory. # export KBUILD_OUTPUT=dir/to/store/output/files/; make # # The O= assignment takes precedence over the KBUILD_OUTPUT environment # variable. ifeq ("$(origin O)", "command line") KBUILD_OUTPUT := $(O) endif ifdef KBUILD_EXTMOD ifdef KBUILD_OUTPUT objtree := $(realpath $(KBUILD_OUTPUT)) $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist)) else objtree := $(abs_srctree) endif # If Make is invoked from the kernel directory (either kernel # source directory or kernel build directory), external modules # are built in $(KBUILD_EXTMOD) for backward compatibility, # otherwise, built in the current directory. output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD))) # KBUILD_EXTMOD might be a relative path. Remember its absolute path before # Make changes the working directory. srcroot := $(realpath $(KBUILD_EXTMOD)) $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist)) else objtree := . output := $(KBUILD_OUTPUT) endif export objtree srcroot # Do we want to change the working directory? ifneq ($(output),) # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first. $(shell mkdir -p "$(output)") # $(realpath ...) resolves symlinks abs_output := $(realpath $(output)) $(if $(abs_output),,$(error failed to create output directory "$(output)")) endif ifneq ($(words $(subst :, ,$(abs_srctree))), 1) $(error source directory cannot contain spaces or colons) endif export sub_make_done := 1 endif # sub_make_done ifeq ($(abs_output),$(CURDIR)) # Suppress "Entering directory ..." if we are at the final work directory. no-print-directory := --no-print-directory else # Recursion to show "Entering directory ..." need-sub-make := 1 endif ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),) # If --no-print-directory is unset, recurse once again to set it. # You may end up recursing into __sub-make twice. This is needed due to the # behavior change in GNU Make 4.4.1. need-sub-make := 1 endif ifeq ($(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) $(no-print-directory) -C $(abs_output) \ -f $(abs_srctree)/Makefile $(MAKECMDGOALS) else # need-sub-make # We process the rest of the Makefile if this is the final invocation of make ifndef KBUILD_EXTMOD srcroot := $(abs_srctree) endif ifeq ($(srcroot),$(CURDIR)) building_out_of_srctree := else export building_out_of_srctree := 1 endif ifdef KBUILD_ABS_SRCTREE # Do nothing. Use the absolute path. else ifeq ($(srcroot),$(CURDIR)) # Building in the source. srcroot := . else ifeq ($(srcroot)/,$(dir $(CURDIR))) # Building in a subdirectory of the source. srcroot := .. endif export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot)) ifdef building_out_of_srctree export VPATH := $(srcroot) else VPATH := endif # 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 \ run-command no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \ image_name single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/ config-build := mixed-build := need-config := 1 may-sync-config := 1 single-build := ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) need-config := endif endif ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),) may-sync-config := endif endif need-compiler := $(may-sync-config) ifneq ($(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 = $(call read-file, $(objtree)/include/config/kernel.release) 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=arm64 # 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=aarch64-linux-gnu- # 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 := $(LLVM) else ifneq ($(LLVM),1) $(error Invalid value for LLVM, see Documentation/kbuild/llvm.rst) 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 # the KERNELDOC macro needs to be exported, as scripts/Makefile.build # has a logic to call it KERNELDOC = $(srctree)/tools/docs/kernel-doc export KERNELDOC KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \ -O2 -fomit-frame-pointer -std=gnu11 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 \ -Astable_features \ -Aunused_features \ -Dnon_ascii_idents \ -Dunsafe_op_in_unsafe_fn \ -Wmissing_docs \ -Wrust_2018_idioms \ -Wunreachable_pub \ -Wclippy::all \ -Wclippy::as_ptr_cast_mut \ -Wclippy::as_underscore \ -Wclippy::cast_lossless \ -Aclippy::collapsible_if \ -Aclippy::collapsible_match \ -Wclippy::ignored_unit_patterns \ -Wclippy::mut_mut \ -Wclippy::needless_bitwise_bool \ -Aclippy::needless_lifetimes \ -Wclippy::no_mangle_with_rust_abi \ -Wclippy::ptr_as_ptr \ -Wclippy::ptr_cast_constness \ -Wclippy::ref_as_ptr \ -Wclippy::undocumented_unsafe_blocks \ -Aclippy::uninlined_format_args \ -Wclippy::unnecessary_safety_comment \ -Wclippy::unnecessary_safety_doc \ -Wrustdoc::missing_crate_level_docs \ -Wrustdoc::unescaped_backticks KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \ $(HOSTCFLAGS) -I $(srctree)/scripts/include KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \ -I $(srctree)/scripts/include KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \ -Zallow-features= $(HOSTRUSTFLAGS) KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS) KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS) KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS)) # 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 PAHOLE = pahole RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids LEX = flex YACC = bison AWK = awk INSTALLKERNEL := installkernel PERL = perl PYTHON3 = python3 CHECK = sparse BASH = bash KGZIP = gzip KBZIP2 = bzip2 KLZOP = lzop LZMA = lzma LZ4 = lz4 XZ = xz ZSTD = zstd TAR = tar 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/$(SRCARCH)/include/generated \ -I$(srctree)/include \ -I$(objtree)/include \ $(USERINCLUDE) # UBUNTU: Include our third party driver stuff too LINUXINCLUDE += -I$(srctree)/ubuntu/include KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE KBUILD_CFLAGS := KBUILD_CFLAGS += -std=gnu11 KBUILD_CFLAGS += -fshort-wchar KBUILD_CFLAGS += -funsigned-char KBUILD_CFLAGS += -fno-common KBUILD_CFLAGS += -fno-PIE KBUILD_CFLAGS += -fno-strict-aliasing KBUILD_CPPFLAGS := -D__KERNEL__ KBUILD_RUSTFLAGS := $(rust_common_flags) \ -Cpanic=abort -Cembed-bitcode=n -Clto=n \ -Cforce-unwind-tables=n -Ccodegen-units=1 \ -Csymbol-mangling-version=v0 \ -Crelocation-model=static \ -Zfunction-sections=n \ -Wclippy::float_arithmetic KBUILD_AFLAGS_KERNEL := KBUILD_CFLAGS_KERNEL := KBUILD_RUSTFLAGS_KERNEL := KBUILD_AFLAGS_MODULE := -DMODULE KBUILD_CFLAGS_MODULE := -DMODULE KBUILD_RUSTFLAGS_MODULE := --cfg MODULE KBUILD_LDFLAGS_MODULE := KBUILD_LDFLAGS := CLANG_FLAGS := ifeq ($(KBUILD_CLIPPY),1) RUSTC_OR_CLIPPY_QUIET := CLIPPY RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER) else RUSTC_OR_CLIPPY_QUIET := RUSTC RUSTC_OR_CLIPPY = $(RUSTC) endif # Allows the usage of unstable features in stable compilers. export RUSTC_BOOTSTRAP := 1 # Allows finding `.clippy.toml` in out-of-srctree builds. export CLIPPY_CONF_DIR := $(srctree) 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 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 TAR export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS 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 # 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 # =========================================================================== # Rules shared between *config targets and build targets # Basic helpers built in scripts/basic/ PHONY += scripts_basic scripts_basic: KBUILD_HOSTCFLAGS := $(KBUILD_HOSTCFLAGS) scripts_basic: KBUILD_HOSTLDFLAGS := $(KBUILD_HOSTLDFLAGS) 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 ifdef KBUILD_EXTMOD print_env_for_makefile = \ echo "export KBUILD_OUTPUT = $(objtree)"; \ echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \ echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)" else print_env_for_makefile = \ echo "export KBUILD_OUTPUT = $(CURDIR)" endif quiet_cmd_makefile = GEN Makefile cmd_makefile = { \ echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \ $(print_env_for_makefile); \ echo "include $(abs_srctree)/Makefile"; \ } > Makefile outputmakefile: ifeq ($(KBUILD_EXTMOD),) @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 else @if [ -f $(srcroot)/modules.order ]; then \ echo >&2 "***"; \ echo >&2 "*** The external module source tree is not clean."; \ echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \ echo >&2 "***"; \ false; \ fi endif $(Q)ln -fsn $(srcroot) 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, RUSTC_VERSION_TEXT and PAHOLE_VERSION are referenced from # Kconfig (so they need export), and from include/config/auto.conf.cmd to # detect the version changes between builds. CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1)) RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null)) PAHOLE_VERSION = $(shell $(srctree)/scripts/pahole-version.sh $(PAHOLE)) ifneq ($(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 RUSTC_VERSION_TEXT PAHOLE_VERSION 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 := y # 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-%,$(MAKECMDGOALS)),) KBUILD_MODULES := y endif ifeq ($(MAKECMDGOALS),) KBUILD_MODULES := y endif export KBUILD_MODULES KBUILD_BUILTIN ifdef need-config include $(objtree)/include/config/auto.conf endif ifeq ($(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 ifdef CONFIG_TRACEPOINTS # To check for unused tracepoints (tracepoints that are defined but never # called), run with: # # make UT=1 # # Each unused tracepoints can take up to 5KB of memory in the running kernel. # It is best to remove any that are not used. # # This command line option will be removed when all current unused # tracepoints are removed. ifeq ("$(origin UT)", "command line") WARN_ON_UNUSED_TRACEPOINTS := $(UT) endif endif # CONFIG_TRACEPOINTS export WARN_ON_UNUSED_TRACEPOINTS 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 show the error message checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf) missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs)) ifdef missing-configs PHONY += $(objtree)/include/config/auto.conf $(objtree)/include/config/auto.conf: @echo >&2 '***' @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:' @printf >&2 '*** - %s\n' $(missing-configs) @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.' @echo >&2 '***' @/bin/false endif endif # may-sync-config endif # need-config KBUILD_CFLAGS += -fno-delete-null-pointer-checks ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE KBUILD_CFLAGS += -O2 KBUILD_RUSTFLAGS += -Copt-level=2 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE KBUILD_CFLAGS += -Os KBUILD_RUSTFLAGS += -Copt-level=s endif # Always set `debug-assertions` and `overflow-checks` because their default # depends on `opt-level` and `debug-assertions`, respectively. KBUILD_RUSTFLAGS += -Cdebug-assertions=$(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 += $(call cc-option,-fno-allow-store-data-races) endif ifdef CONFIG_READABLE_ASM # Disable optimizations that make assembler listings hard to read. # reorder blocks reorders the control in the function # ipa clone creates specialized cloned functions # partial inlining inlines only parts of functions KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining endif stackp-flags-y := -fno-stack-protector stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong KBUILD_CFLAGS += $(stackp-flags-y) 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 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang export CC_AUTO_VAR_INIT_ZERO_ENABLER KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER) endif endif ifdef CONFIG_CC_IS_CLANG ifdef CONFIG_CC_HAS_COUNTED_BY_PTR KBUILD_CFLAGS += -fexperimental-late-parse-attributes endif endif # Explicitly clear padding bits during variable initialization KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all) # 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) # Get details on warnings generated due to GCC value tracking. KBUILD_CFLAGS += $(call cc-option, -fdiagnostics-show-context=2) # Clear used registers at func exit (to reduce data lifetime and ROP gadgets). ifdef CONFIG_ZERO_CALL_USED_REGS KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr endif ifdef CONFIG_FUNCTION_TRACER ifdef CONFIG_FTRACE_MCOUNT_USE_CC CC_FLAGS_FTRACE += -mrecord-mcount ifdef CONFIG_HAVE_NOP_MCOUNT ifeq ($(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 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT endif 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 ifndef CONFIG_DYNAMIC_SCS CC_FLAGS_SCS := -fsanitize=shadow-call-stack KBUILD_CFLAGS += $(CC_FLAGS_SCS) KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack endif export CC_FLAGS_SCS endif ifdef CONFIG_LTO_CLANG ifdef CONFIG_LTO_CLANG_THIN CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit 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 endif ifdef CONFIG_LTO KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO) KBUILD_AFLAGS += -fno-lto export CC_FLAGS_LTO endif ifdef CONFIG_CFI CC_FLAGS_CFI := -fsanitize=kcfi ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers endif ifdef CONFIG_FINEIBT_BHI CC_FLAGS_CFI += -fsanitize-kcfi-arity endif ifdef CONFIG_RUST # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS. RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI) export RUSTC_FLAGS_CFI endif KBUILD_CFLAGS += $(CC_FLAGS_CFI) export CC_FLAGS_CFI endif # Architectures can define flags to add/remove for floating-point support CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT export CC_FLAGS_FPU export CC_FLAGS_NO_FPU ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0) # Set the minimal function alignment. Use the newer GCC option # -fmin-function-alignment if it is available, or fall back to -falign-funtions. # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT. ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT) else KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT) endif endif # arch Makefile may override CC so keep this after arch Makefile is included NOSTDINC_FLAGS += -nostdinc # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE, # the kernel uses only C99 flexible arrays for dynamically sized trailing # arrays. Enforce this for everything that may examine structure sizes and # perform bounds checking. KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3) # Allow including a tagged struct or union anonymously in another struct/union. KBUILD_CFLAGS += -fms-extensions # disable invalid "can't wrap" optimizations for signed / pointers KBUILD_CFLAGS += -fno-strict-overflow # Make sure -fstack-check isn't enabled (like gentoo apparently did) KBUILD_CFLAGS += -fno-stack-check # conserve stack if available ifdef CONFIG_CC_IS_GCC KBUILD_CFLAGS += -fconserve-stack endif # Ensure compilers do not transform certain loops into calls to wcslen() KBUILD_CFLAGS += -fno-builtin-wcslen # change __FILE__ to the relative path to the source directory ifdef building_out_of_srctree KBUILD_CPPFLAGS += -fmacro-prefix-map=$(srcroot)/= ifeq ($(call rustc-option-yn, --remap-path-scope=macro),y) KBUILD_RUSTFLAGS += --remap-path-prefix=$(srcroot)/= --remap-path-scope=macro endif endif # include additional Makefiles when needed include-y := scripts/Makefile.warn include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf 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-$(CONFIG_KSTACK_ERASE) += scripts/Makefile.kstack_erase include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller include-$(CONFIG_WARN_CONTEXT_ANALYSIS) += scripts/Makefile.context-analysis 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) # ld.lld before 15 did not support -z pack-relative-relocs. LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs) endif # We never want expected sections to be placed heuristically by the # linker. All sections should be explicitly named in the linker script. ifdef CONFIG_LD_ORPHAN_WARN LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL) endif ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),) LDFLAGS_vmlinux += --emit-relocs --discard-none endif # Align the architecture of userspace programs with the kernel USERFLAGS_FROM_KERNEL := --target=% ifdef CONFIG_ARCH_USERFLAGS KBUILD_USERCFLAGS += $(CONFIG_ARCH_USERFLAGS) KBUILD_USERLDFLAGS += $(CONFIG_ARCH_USERFLAGS) else # If not overridden also inherit the bit size USERFLAGS_FROM_KERNEL += -m32 -m64 endif KBUILD_USERCFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) KBUILD_USERLDFLAGS += $(filter $(USERFLAGS_FROM_KERNEL), $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)) # userspace programs are linked via the compiler, use the correct linker ifdef CONFIG_CC_IS_CLANG KBUILD_USERLDFLAGS += --ld-path=$(LD) endif # 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 $(CONFIG_64BIT),-m64,-m32) # Validate the checker is available and functional ifneq ($(KBUILD_CHECKSRC), 0) ifneq ($(shell $(srctree)/scripts/checker-valid.sh $(CHECK) $(CHECKFLAGS)), 1) $(warning C=$(KBUILD_CHECKSRC) specified, but $(CHECK) is not available or not up to date) KBUILD_CHECKSRC = 0 endif endif # Default kernel image to build when no specific target is given. # KBUILD_IMAGE may be overruled on the command line or # set in the environment # Also any assignments in arch/$(ARCH)/Makefile take precedence over # this default value export KBUILD_IMAGE ?= vmlinux # # INSTALL_PATH specifies where to place the updated kernel and system map # images. Default is /boot, but you can set it to other values export INSTALL_PATH ?= /boot # # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots. # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as # an argument if needed. Otherwise it defaults to the kernel install path # export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE) # # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory # relocations required by build roots. This is not defined in the # makefile but the argument can be passed to make if needed. # MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE) export MODLIB PHONY += prepare0 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 $(patsubst %/, %/lib.a, $(filter %/, $(libs-y))) KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y)) export KBUILD_VMLINUX_LIBS export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds 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. KBUILD_MODULES := y endif # '$(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 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) $(KBUILD_VMLINUX_LIBS)): . ; ifeq ($(origin KERNELRELEASE),file) filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree) else filechk_kernel.release = echo $(KERNELRELEASE) endif # 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) include/generated/utsrelease.h \ include/generated/compile.h include/generated/autoconf.h \ include/generated/rustc_cfg 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-headers 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): private PATCHLEVEL := $(or $(PATCHLEVEL), 0) $(version_h): private 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); \ find usr/include -type f -name '*.h' -print0 | \ tar -czf - --null --no-recursion --no-wildcards-match-slash -T- | \ tar -xzf - --strip-components=1 -C $(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 ifdef HEADER_ARCH $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers else $(Q)$(MAKE) $(hdr-inst)=include/uapi $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= endif ifdef CONFIG_HEADERS_INSTALL prepare: headers endif PHONY += usr_gen_init_cpio usr_gen_init_cpio: scripts_basic $(Q)$(MAKE) $(build)=usr usr/gen_init_cpio PHONY += scripts_unifdef scripts_unifdef: scripts_basic $(Q)$(MAKE) $(build)=scripts scripts/unifdef PHONY += scripts_gen_packed_field_checks scripts_gen_packed_field_checks: scripts_basic $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks # --------------------------------------------------------------------------- # 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 # --------------------------------------------------------------------------- # vDSO install PHONY += vdso_install vdso_install: export INSTALL_FILES = $(vdso-install-y) vdso_install: $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst # --------------------------------------------------------------------------- # Tools ifdef CONFIG_OBJTOOL prepare: tools/objtool endif ifdef CONFIG_BPF ifdef CONFIG_DEBUG_INFO_BTF prepare: tools/bpf/resolve_btfids endif endif # The tools build system is not a part of Kbuild and tends to introduce # its own unique issues. If you need to integrate a new tool into Kbuild, # please consider locating that tool outside the tools/ tree and using the # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry # here. See Documentation/kbuild/makefiles.rst for details. 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 PHONY += objtool_clean objtool_mrproper objtool_O = $(abspath $(objtree))/tools/objtool objtool_clean objtool_mrproper: ifneq ($(wildcard $(objtool_O)),) $(Q)$(MAKE) -sC $(abs_srctree)/tools/objtool O=$(objtool_O) srctree=$(abs_srctree) $(patsubst objtool_%,%,$@) endif tools/: FORCE $(Q)mkdir -p $(objtree)/tools $(Q)$(MAKE) O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ tools/%: FORCE $(Q)mkdir -p $(objtree)/tools $(Q)$(MAKE) 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 $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \ xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig # --------------------------------------------------------------------------- # Devicetree files ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) dtstree := arch/$(SRCARCH)/boot/dts endif dtbindingtree := Documentation/devicetree/bindings %.yaml: dtbs_prepare $(Q)$(MAKE) $(build)=$(dtbindingtree) \ $(dtbindingtree)/$(patsubst %.yaml,%.example.dtb,$@) dt_binding_check_one ifneq ($(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) need-dtbslist=1 # 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 %.yaml, $(MAKECMDGOALS)),) export CHECK_DTBS=y endif ifneq ($(CHECK_DTBS),) dtbs_prepare: dt_binding_schemas endif dtbs_check: dtbs dtbs_install: $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree) ifdef CONFIG_OF_EARLY_FLATTREE all: dtbs endif ifdef CONFIG_GENERIC_BUILTIN_DTB vmlinux: dtbs endif endif PHONY += scripts_dtc scripts_dtc: scripts_basic $(Q)$(MAKE) $(build)=scripts/dtc ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),) export CHECK_DTBS=y endif PHONY += dt_binding_check dt_binding_schemas dt_binding_check: dt_binding_schemas scripts_dtc $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ dt_binding_schemas: $(Q)$(MAKE) $(build)=$(dtbindingtree) PHONY += dt_compatible_check dt_compatible_check: dt_binding_schemas $(Q)$(MAKE) $(build)=$(dtbindingtree) $@ # --------------------------------------------------------------------------- # 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 := y endif # Build modules # # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES # is an exception. ifdef CONFIG_DEBUG_INFO_BTF_MODULES KBUILD_BUILTIN := y modules: vmlinux endif modules: modules_prepare # Target to prepare building external modules modules_prepare: prepare $(Q)$(MAKE) $(build)=scripts scripts/module.lds endif # CONFIG_MODULES ### # Cleaning is done on three levels. # make clean Delete most generated files # Leave enough to build external modules # make mrproper Delete the current configuration, and all generated files # make distclean Remove editor backup files, patch leftover files and the like # Directories & files removed with 'make clean' CLEAN_FILES += vmlinux.symvers modules-only.symvers \ modules.builtin modules.builtin.modinfo modules.nsdeps \ modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \ compile_commands.json rust/test \ rust-project.json .vmlinux.objs .vmlinux.export.c \ .builtin-dtbs-list .builtin-dtbs.S # Directories & files removed with 'make mrproper' MRPROPER_FILES += include/config include/generated \ arch/$(SRCARCH)/include/generated .objdiff \ snap tar-install PKGBUILD pacman \ .config .config.old .version \ Module.symvers \ certs/signing_key.pem \ certs/x509.genkey \ vmlinux-gdb.py \ rpmbuild \ rust/libmacros.so rust/libmacros.dylib \ rust/libpin_init_internal.so rust/libpin_init_internal.dylib # clean - Delete most, but leave enough to build external modules # clean: private 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 objtool_clean # mrproper - Delete all generated files, including .config # mrproper: private rm-files := $(MRPROPER_FILES) mrproper-dirs := $(addprefix _mrproper_,scripts) PHONY += $(mrproper-dirs) mrproper $(mrproper-dirs): $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) mrproper: clean objtool_mrproper $(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 # --------------------------------------------------------------------------- modules-cpio-pkg: usr_gen_init_cpio %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 $(board-dirs:/=))) PHONY += help help: @echo 'Cleaning targets:' @echo ' clean - Remove most generated files but keep the config and' @echo ' enough build support to build external modules' @echo ' mrproper - Remove all generated files + config + various backup files' @echo ' distclean - mrproper + remove editor backup and patch files' @echo '' @$(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 ' vdso_install - Install unstripped vdso 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 - Build ready-to-install UAPI headers in usr/include' @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \ echo ' (default: $(INSTALL_HDR_PATH))'; \ echo '' @echo 'Static analysers:' @echo ' checkstack - Generate a list of stack hogs and consider all functions' @echo ' with a stack size larger than MINSTACKSIZE (default: 100)' @echo ' versioncheck - Sanity check on version.h usage' @echo ' includecheck - Check for duplicate included header files' @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 $(INSTALL_DTBS_PATH)'; \ echo ' dt_binding_check - Validate device tree binding documents and examples'; \ echo ' dt_binding_schemas - Build processed device tree binding schemas'; \ echo ' dtbs_check - Validate device tree source files';\ echo '') @echo 'Userspace tools targets:' @echo ' use "make tools/help"' @echo ' or "cd tools; make help"' @echo '' @echo 'Kernel packaging:' @$(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=n [targets] 1: verbose build' @echo ' 2: give reason for rebuild of target' @echo ' V=1 and V=2 can be combined with V=12' @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,c,e 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 ' c: extra checks in the configuration stage (Kconfig)' @echo ' e: warnings are being treated as errors' @echo ' Multiple levels can be combined with W=12 or W=123' @echo ' make UT=1 [targets] Warn if a tracepoint is defined but not used.' @echo ' [ This will be removed when all current unused tracepoints are eliminated. ]' @$(if $(dtstree), \ echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \ echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \ ) @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 texinfodocs infodocs mandocs \ htmldocs-redirects 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 # # Generated files as well as vendored crates are skipped. PHONY += rustfmt rustfmtcheck rustfmt: $(Q)find $(srctree) $(RCS_FIND_IGNORE) \ \( \ -path $(srctree)/rust/proc-macro2 \ -o -path $(srctree)/rust/quote \ -o -path $(srctree)/rust/syn \ \) -prune -o \ -type f -a -name '*.rs' -a ! -name '*generated*' -print \ | xargs $(RUSTFMT) $(rustfmt_flags) rustfmtcheck: rustfmt_flags = --check rustfmtcheck: rustfmt # Misc # --------------------------------------------------------------------------- PHONY += misc-check misc-check: $(Q)$(srctree)/scripts/misc-check all: misc-check 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 filechk_kernel.release = echo $(KERNELRELEASE) ### # 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 := y build-dir := . clean-dirs := . clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json PHONY += prepare # now expand this into a simple variable to reduce the cost of shell evaluations prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT) prepare: PAHOLE_VERSION := $(PAHOLE_VERSION) prepare: @if [ "$(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: $(CC_VERSION_TEXT)"; \ fi @if [ "$(PAHOLE_VERSION)" != "$(CONFIG_PAHOLE_VERSION)" ]; then \ echo >&2 "warning: pahole version differs from the one used to build the kernel"; \ echo >&2 " The kernel was built with: $(CONFIG_PAHOLE_VERSION)"; \ echo >&2 " You are using: $(PAHOLE_VERSION)"; \ 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 ' rust-analyzer - generate rust-project.json rust-analyzer support file' @echo '' ifndef CONFIG_MODULES modules modules_install: __external_modules_error __external_modules_error: @echo >&2 '***' @echo >&2 '*** The present kernel disabled CONFIG_MODULES.' @echo >&2 '*** You cannot build or install external modules.' @echo >&2 '***' @false endif endif # KBUILD_EXTMOD # --------------------------------------------------------------------------- # Modules PHONY += modules modules_install modules_sign modules_prepare modules_install: $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \ sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y) ifeq ($(CONFIG_MODULE_SIG),y) # modules_sign is a subset of modules_install. # 'make modules_install modules_sign' is equivalent to 'make modules_install'. modules_sign: modules_install @: else modules_sign: @echo >&2 '***' @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.' @echo >&2 '***' @false endif ifdef CONFIG_MODULES modules.order: $(build-dir) @: # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. # This is solely useful to speed up test compiles. modules: modpost ifneq ($(KBUILD_MODPOST_NOFINAL),1) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal endif PHONY += modules_check modules_check: modules.order $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $< else # CONFIG_MODULES modules: @: 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 modules.order 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 $(m:%.ko=%.o);) } > modules.order $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost ifneq ($(KBUILD_MODPOST_NOFINAL),1) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal endif $(Q)rm -f modules.order single-goals := $(addprefix $(build-dir)/, $(single-no-ko)) KBUILD_MODULES := y endif prepare: outputmakefile # 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 . $(RCS_FIND_IGNORE) \ \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \ -o -name '*.ko.*' \ -o -name '*.dtb' -o -name '*.dtbo' \ -o -name '*.dtb.S' -o -name '*.dtbo.S' \ -o -name '*.dt.yaml' -o -name 'dtbs-list' \ -o -name '*.dwo' -o -name '*.lst' \ -o -name '*.su' -o -name '*.mod' \ -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ -o -name '*.lex.c' -o -name '*.tab.[ch]' \ -o -name '*.asn1.[ch]' \ -o -name '*.symtypes' -o -name 'modules.order' \ -o -name '*.c.[012]*.*' \ -o -name '*.ll' \ -o -name '*.gcno' \ \) -type f -print \ -o -name '.tmp_*' -print \ | xargs rm -rf # Generate tags for editors # --------------------------------------------------------------------------- quiet_cmd_tags = GEN $@ cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@ tags TAGS cscope gtags: FORCE $(call cmd,tags) # Generate rust-project.json (a file that describes the structure of non-Cargo # Rust projects) for rust-analyzer (an implementation of the Language Server # Protocol). PHONY += rust-analyzer rust-analyzer: +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh ifdef KBUILD_EXTMOD # FIXME: external modules must not descend into a sub-directory of the kernel $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@ else $(Q)$(MAKE) $(build)=rust $@ endif # 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)) compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \ $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \ $(if $(CONFIG_MODULES), modules.order) FORCE $(call if_changed,gen_compile_commands) targets += 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: 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 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) $(srctree)/scripts/$@ 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 MINSTACKSIZE ?= 100 checkstack: $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \ $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE) kernelrelease: @$(filechk_kernel.release) kernelversion: @echo $(KERNELVERSION) image_name: @echo $(KBUILD_IMAGE) PHONY += run-command run-command: $(Q)$(KBUILD_RUN_COMMAND) 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)