1 # SPDX-License-Identifier: GPL-2.0
6 NAME = Baby Opossum Posse
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
14 ifeq ($(filter output-sync,$(.FEATURES)),)
15 $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__' are only for internal use))
21 # That's our default target when none is given on the command line
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
41 this-makefile := $(lastword $(MAKEFILE_LIST))
42 abs_srctree := $(realpath $(dir $(this-makefile)))
43 abs_output := $(CURDIR)
45 ifneq ($(sub_make_done),1)
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
51 # Avoid funny character set dependencies
55 export LC_COLLATE LC_NUMERIC
57 # Avoid interference with shell env settings
61 # ---------------------------------------------------------------------------
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
74 # $(Q)$(MAKE) $(build)=scripts/basic
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
82 ifeq ("$(origin V)", "command line")
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
94 # If the user is running make -s (silent mode), suppress echoing of
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
98 override KBUILD_VERBOSE :=
101 export quiet Q KBUILD_VERBOSE
103 # Call a source code checker (by default, "sparse") as part of the
106 # Use 'make C=1' to enable checking of only re-compiled files.
107 # Use 'make C=2' to enable checking of *all* source files, regardless
108 # of whether they are re-compiled or not.
110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
111 # including where to get the "sparse" utility.
113 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C)
116 ifndef KBUILD_CHECKSRC
120 export KBUILD_CHECKSRC
122 # Enable "clippy" (a linter) as part of the Rust compilation.
124 # Use 'make CLIPPY=1' to enable it.
125 ifeq ("$(origin CLIPPY)", "command line")
126 KBUILD_CLIPPY := $(CLIPPY)
131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132 # directory of external module to build. Setting M= takes precedence.
133 ifeq ("$(origin M)", "command line")
134 KBUILD_EXTMOD := $(M)
137 ifeq ("$(origin MO)", "command line")
138 KBUILD_EXTMOD_OUTPUT := $(MO)
141 $(if $(word 2, $(KBUILD_EXTMOD)), \
142 $(error building multiple external modules is not supported))
144 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
145 $(error module directory path cannot contain '$x')))
147 # Remove trailing slashes
148 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
149 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
154 ifeq ("$(origin W)", "command line")
155 KBUILD_EXTRA_WARN := $(W)
158 export KBUILD_EXTRA_WARN
160 # Kbuild will save output files in the current working directory.
161 # This does not need to match to the root of the kernel source tree.
163 # For example, you can do this:
165 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
167 # If you want to save output files in a different location, there are
168 # two syntaxes to specify it.
171 # Use "make O=dir/to/store/output/files/"
173 # 2) Set KBUILD_OUTPUT
174 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
175 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
177 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
180 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O)
186 objtree := $(realpath $(KBUILD_OUTPUT))
187 $(if $(objtree),,$(error specified kernel directory "$(KBUILD_OUTPUT)" does not exist))
189 objtree := $(abs_srctree)
191 # If Make is invoked from the kernel directory (either kernel
192 # source directory or kernel build directory), external modules
193 # are built in $(KBUILD_EXTMOD) for backward compatibility,
194 # otherwise, built in the current directory.
195 output := $(or $(KBUILD_EXTMOD_OUTPUT),$(if $(filter $(CURDIR),$(objtree) $(abs_srctree)),$(KBUILD_EXTMOD)))
196 # KBUILD_EXTMOD might be a relative path. Remember its absolute path before
197 # Make changes the working directory.
198 srcroot := $(realpath $(KBUILD_EXTMOD))
199 $(if $(srcroot),,$(error specified external module directory "$(KBUILD_EXTMOD)" does not exist))
202 output := $(KBUILD_OUTPUT)
205 export objtree srcroot
207 # Do we want to change the working directory?
209 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
210 $(shell mkdir -p "$(output)")
211 # $(realpath ...) resolves symlinks
212 abs_output := $(realpath $(output))
213 $(if $(abs_output),,$(error failed to create output directory "$(output)"))
216 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
217 $(error source directory cannot contain spaces or colons)
220 export sub_make_done := 1
222 endif # sub_make_done
224 ifeq ($(abs_output),$(CURDIR))
225 # Suppress "Entering directory ..." if we are at the final work directory.
226 no-print-directory := --no-print-directory
228 # Recursion to show "Entering directory ..."
232 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
233 # If --no-print-directory is unset, recurse once again to set it.
234 # You may end up recursing into __sub-make twice. This is needed due to the
235 # behavior change in GNU Make 4.4.1.
239 ifeq ($(need-sub-make),1)
241 PHONY += $(MAKECMDGOALS) __sub-make
243 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
246 # Invoke a second make in the output directory, passing relevant variables
248 $(Q)$(MAKE) $(no-print-directory) -C $(abs_output) \
249 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
253 # We process the rest of the Makefile if this is the final invocation of make
256 srcroot := $(abs_srctree)
259 ifeq ($(srcroot),$(CURDIR))
260 building_out_of_srctree :=
262 export building_out_of_srctree := 1
265 ifdef KBUILD_ABS_SRCTREE
266 # Do nothing. Use the absolute path.
267 else ifeq ($(srcroot),$(CURDIR))
268 # Building in the source.
270 else ifeq ($(srcroot)/,$(dir $(CURDIR)))
271 # Building in a subdirectory of the source.
275 export srctree := $(if $(KBUILD_EXTMOD),$(abs_srctree),$(srcroot))
277 ifdef building_out_of_srctree
278 export VPATH := $(srcroot)
283 # To make sure we do not include .config for any of the *config targets
284 # catch them early, and hand them over to scripts/kconfig/Makefile
285 # It is allowed to specify more targets when calling make, including
286 # mixing *config targets and build targets.
287 # For example 'make oldconfig all'.
288 # Detect when mixed targets is specified, and make a second invocation
289 # of make so .config is not included in this case either (for *config).
291 version_h := include/generated/uapi/linux/version.h
293 clean-targets := %clean mrproper cleandocs
294 no-dot-config-targets := $(clean-targets) \
295 cscope gtags TAGS tags help% %docs check% coccicheck \
296 $(version_h) headers headers_% archheaders archscripts \
297 %asm-generic kernelversion %src-pkg dt_binding_check \
298 outputmakefile rustavailable rustfmt rustfmtcheck
299 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
301 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %/
309 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
310 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
315 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
316 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
321 need-compiler := $(may-sync-config)
323 ifneq ($(KBUILD_EXTMOD),)
327 ifeq ($(KBUILD_EXTMOD),)
328 ifneq ($(filter %config,$(MAKECMDGOALS)),)
330 ifneq ($(words $(MAKECMDGOALS)),1)
336 # We cannot build single targets and the others at the same time
337 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
339 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
344 # For "make -j clean all", "make -j mrproper defconfig all", etc.
345 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
346 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
351 # install and modules_install need also be processed one by one
352 ifneq ($(filter install,$(MAKECMDGOALS)),)
353 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
359 # ===========================================================================
360 # We're called with mixed targets (*config and build targets).
361 # Handle them one by one.
363 PHONY += $(MAKECMDGOALS) __build_one_by_one
365 $(MAKECMDGOALS): __build_one_by_one
370 for i in $(MAKECMDGOALS); do \
371 $(MAKE) -f $(srctree)/Makefile $$i; \
376 include $(srctree)/scripts/Kbuild.include
378 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
379 KERNELRELEASE = $(call read-file, $(objtree)/include/config/kernel.release)
380 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
381 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
383 include $(srctree)/scripts/subarch.include
385 # Cross compiling and selecting different set of gcc/bin-utils
386 # ---------------------------------------------------------------------------
388 # When performing cross compilation for other architectures ARCH shall be set
389 # to the target architecture. (See arch/* for the possibilities).
390 # ARCH can be set during invocation of make:
392 # Another way is to have ARCH set in the environment.
393 # The default ARCH is the host where make is executed.
395 # CROSS_COMPILE specify the prefix used for all executables used
396 # during compilation. Only gcc and related bin-utils executables
397 # are prefixed with $(CROSS_COMPILE).
398 # CROSS_COMPILE can be set on the command line
399 # make CROSS_COMPILE=aarch64-linux-gnu-
400 # Alternatively CROSS_COMPILE can be set in the environment.
401 # Default value for CROSS_COMPILE is not to prefix executables
402 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
405 # Architecture as present in compile.h
406 UTS_MACHINE := $(ARCH)
409 # Additional ARCH settings for x86
413 ifeq ($(ARCH),x86_64)
417 # Additional ARCH settings for sparc
418 ifeq ($(ARCH),sparc32)
421 ifeq ($(ARCH),sparc64)
425 # Additional ARCH settings for parisc
426 ifeq ($(ARCH),parisc64)
430 export cross_compiling :=
431 ifneq ($(SRCARCH),$(SUBARCH))
435 KCONFIG_CONFIG ?= .config
436 export KCONFIG_CONFIG
438 # SHELL used by kbuild
441 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
442 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
443 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
446 ifneq ($(filter %/,$(LLVM)),)
447 LLVM_PREFIX := $(LLVM)
448 else ifneq ($(filter -%,$(LLVM)),)
449 LLVM_SUFFIX := $(LLVM)
452 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
453 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
459 HOSTPKG_CONFIG = pkg-config
461 # the KERNELDOC macro needs to be exported, as scripts/Makefile.build
462 # has a logic to call it
463 KERNELDOC = $(srctree)/scripts/kernel-doc.py
466 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
467 -O2 -fomit-frame-pointer -std=gnu11
468 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
469 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
471 # These flags apply to all Rust code in the tree, including the kernel and
473 export rust_common_flags := --edition=2021 \
474 -Zbinary_dep_depinfo=y \
477 -Dunsafe_op_in_unsafe_fn \
482 -Wclippy::ignored_unit_patterns \
484 -Wclippy::needless_bitwise_bool \
485 -Aclippy::needless_lifetimes \
486 -Wclippy::no_mangle_with_rust_abi \
487 -Wclippy::undocumented_unsafe_blocks \
488 -Wclippy::unnecessary_safety_comment \
489 -Wclippy::unnecessary_safety_doc \
490 -Wrustdoc::missing_crate_level_docs \
491 -Wrustdoc::unescaped_backticks
493 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
494 $(HOSTCFLAGS) -I $(srctree)/scripts/include
495 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
496 -I $(srctree)/scripts/include
497 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
498 -Zallow-features= $(HOSTRUSTFLAGS)
499 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
500 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
501 KBUILD_PROCMACROLDFLAGS := $(or $(PROCMACROLDFLAGS),$(KBUILD_HOSTLDFLAGS))
503 # Make variables (CC, etc...)
506 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
507 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
508 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
509 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
510 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
511 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
512 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
513 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
515 CC = $(CROSS_COMPILE)gcc
516 LD = $(CROSS_COMPILE)ld
517 AR = $(CROSS_COMPILE)ar
518 NM = $(CROSS_COMPILE)nm
519 OBJCOPY = $(CROSS_COMPILE)objcopy
520 OBJDUMP = $(CROSS_COMPILE)objdump
521 READELF = $(CROSS_COMPILE)readelf
522 STRIP = $(CROSS_COMPILE)strip
527 CLIPPY_DRIVER = clippy-driver
530 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
534 INSTALLKERNEL := installkernel
547 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
548 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
559 # Use USERINCLUDE when you must reference the UAPI directories only.
561 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
562 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
563 -I$(srctree)/include/uapi \
564 -I$(objtree)/include/generated/uapi \
565 -include $(srctree)/include/linux/compiler-version.h \
566 -include $(srctree)/include/linux/kconfig.h
568 # Use LINUXINCLUDE when you must reference the include/ directory.
569 # Needed to be compatible with the O= option
571 -I$(srctree)/arch/$(SRCARCH)/include \
572 -I$(objtree)/arch/$(SRCARCH)/include/generated \
573 -I$(srctree)/include \
574 -I$(objtree)/include \
577 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
580 KBUILD_CFLAGS += -std=gnu11
581 KBUILD_CFLAGS += -fshort-wchar
582 KBUILD_CFLAGS += -funsigned-char
583 KBUILD_CFLAGS += -fno-common
584 KBUILD_CFLAGS += -fno-PIE
585 KBUILD_CFLAGS += -fno-strict-aliasing
587 KBUILD_CPPFLAGS := -D__KERNEL__
588 KBUILD_RUSTFLAGS := $(rust_common_flags) \
589 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
590 -Cforce-unwind-tables=n -Ccodegen-units=1 \
591 -Csymbol-mangling-version=v0 \
592 -Crelocation-model=static \
593 -Zfunction-sections=n \
594 -Wclippy::float_arithmetic
596 KBUILD_AFLAGS_KERNEL :=
597 KBUILD_CFLAGS_KERNEL :=
598 KBUILD_RUSTFLAGS_KERNEL :=
599 KBUILD_AFLAGS_MODULE := -DMODULE
600 KBUILD_CFLAGS_MODULE := -DMODULE
601 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
602 KBUILD_LDFLAGS_MODULE :=
606 ifeq ($(KBUILD_CLIPPY),1)
607 RUSTC_OR_CLIPPY_QUIET := CLIPPY
608 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
610 RUSTC_OR_CLIPPY_QUIET := RUSTC
611 RUSTC_OR_CLIPPY = $(RUSTC)
614 # Allows the usage of unstable features in stable compilers.
615 export RUSTC_BOOTSTRAP := 1
617 # Allows finding `.clippy.toml` in out-of-srctree builds.
618 export CLIPPY_CONF_DIR := $(srctree)
620 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
621 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
622 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
623 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
624 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
625 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
626 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE
627 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
629 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
630 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
631 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
632 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
633 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
634 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
636 # Files to ignore in find ... statements
638 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
639 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
642 # ===========================================================================
643 # Rules shared between *config targets and build targets
645 # Basic helpers built in scripts/basic/
646 PHONY += scripts_basic
648 $(Q)$(MAKE) $(build)=scripts/basic
650 PHONY += outputmakefile
651 ifdef building_out_of_srctree
652 # Before starting out-of-tree build, make sure the source tree is clean.
653 # outputmakefile generates a Makefile in the output directory, if using a
654 # separate output directory. This allows convenient use of make in the
656 # At the same time when output Makefile generated, generate .gitignore to
657 # ignore whole output directory
660 print_env_for_makefile = \
661 echo "export KBUILD_OUTPUT = $(objtree)"; \
662 echo "export KBUILD_EXTMOD = $(realpath $(srcroot))" ; \
663 echo "export KBUILD_EXTMOD_OUTPUT = $(CURDIR)"
665 print_env_for_makefile = \
666 echo "export KBUILD_OUTPUT = $(CURDIR)"
669 quiet_cmd_makefile = GEN Makefile
671 echo "\# Automatically generated by $(abs_srctree)/Makefile: don't edit"; \
672 $(print_env_for_makefile); \
673 echo "include $(abs_srctree)/Makefile"; \
677 ifeq ($(KBUILD_EXTMOD),)
678 @if [ -f $(srctree)/.config -o \
679 -d $(srctree)/include/config -o \
680 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
682 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
683 echo >&2 "*** in $(abs_srctree)";\
688 @if [ -f $(srcroot)/modules.order ]; then \
690 echo >&2 "*** The external module source tree is not clean."; \
691 echo >&2 "*** Please run 'make -C $(abs_srctree) M=$(realpath $(srcroot)) clean'"; \
696 $(Q)ln -fsn $(srcroot) source
698 $(Q)test -e .gitignore || \
699 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
702 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
703 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
704 # CC_VERSION_TEXT and RUSTC_VERSION_TEXT are referenced from Kconfig (so they
705 # need export), and from include/config/auto.conf.cmd to detect the compiler
707 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
708 RUSTC_VERSION_TEXT = $(subst $(pound),,$(shell $(RUSTC) --version 2>/dev/null))
710 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
711 include $(srctree)/scripts/Makefile.clang
714 # Include this also for config targets because some architectures need
715 # cc-cross-prefix to determine CROSS_COMPILE.
717 include $(srctree)/scripts/Makefile.compiler
721 # ===========================================================================
722 # *config targets only - make sure prerequisites are updated, and descend
723 # in scripts/kconfig to make the *config target
725 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
726 # KBUILD_DEFCONFIG may point out an alternative default configuration
727 # used for 'make defconfig'
728 include $(srctree)/arch/$(SRCARCH)/Makefile
729 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT RUSTC_VERSION_TEXT
731 config: outputmakefile scripts_basic FORCE
732 $(Q)$(MAKE) $(build)=scripts/kconfig $@
734 %config: outputmakefile scripts_basic FORCE
735 $(Q)$(MAKE) $(build)=scripts/kconfig $@
738 # ===========================================================================
739 # Build targets only - this includes vmlinux, arch-specific targets, clean
740 # targets and others. In general all targets except *config targets.
742 # If building an external module we do not care about the all: rule
743 # but instead __all depend on modules
745 ifeq ($(KBUILD_EXTMOD),)
753 # Decide whether to build built-in, modular, or both.
754 # Normally, just do built-in.
759 # If we have only "make modules", don't compile built-in objects.
760 ifeq ($(MAKECMDGOALS),modules)
764 # If we have "make <whatever> modules", compile modules
765 # in addition to whatever we do anyway.
766 # Just "make" or "make all" shall build modules as well
768 ifneq ($(filter all modules nsdeps compile_commands.json clang-%,$(MAKECMDGOALS)),)
772 ifeq ($(MAKECMDGOALS),)
776 export KBUILD_MODULES KBUILD_BUILTIN
779 include $(objtree)/include/config/auto.conf
782 ifeq ($(KBUILD_EXTMOD),)
783 # Objects we will link into vmlinux / subdirs we need to visit
787 endif # KBUILD_EXTMOD
789 # The all: target is the default when no target is given on the
791 # This allow a user to issue only 'make' to build a kernel including modules
792 # Defaults to vmlinux, but the arch makefile usually adds further targets
795 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
796 ifdef CONFIG_CC_IS_GCC
797 CFLAGS_GCOV += -fno-tree-loop-im
801 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
802 ifdef CONFIG_FUNCTION_TRACER
803 CC_FLAGS_FTRACE := -pg
806 include $(srctree)/arch/$(SRCARCH)/Makefile
809 ifdef may-sync-config
810 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
811 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
812 # because some architectures define CROSS_COMPILE there.
813 include include/config/auto.conf.cmd
817 @echo >&2 '*** Configuration file "$@" not found!'
819 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
820 @echo >&2 '*** "make menuconfig" or "make xconfig").'
824 # The actual configuration files used during the build are stored in
825 # include/generated/ and include/config/. Update them if .config is newer than
826 # include/config/auto.conf (which mirrors .config).
828 # This exploits the 'multi-target pattern rule' trick.
829 # The syncconfig should be executed only once to make all the targets.
830 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
832 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
833 # so you cannot notice that Kconfig is waiting for the user input.
834 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
835 $(Q)$(kecho) " SYNC $@"
836 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
837 else # !may-sync-config
838 # External modules and some install targets need include/generated/autoconf.h
839 # and include/config/auto.conf but do not care if they are up-to-date.
840 # Use auto.conf to show the error message
842 checked-configs := $(addprefix $(objtree)/, include/generated/autoconf.h include/generated/rustc_cfg include/config/auto.conf)
843 missing-configs := $(filter-out $(wildcard $(checked-configs)), $(checked-configs))
845 ifdef missing-configs
846 PHONY += $(objtree)/include/config/auto.conf
848 $(objtree)/include/config/auto.conf:
850 @echo >&2 '*** ERROR: Kernel configuration is invalid. The following files are missing:'
851 @printf >&2 '*** - %s\n' $(missing-configs)
852 @echo >&2 '*** Run "make oldconfig && make prepare" on kernel source to fix it.'
857 endif # may-sync-config
860 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
862 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
864 KBUILD_RUSTFLAGS += -Copt-level=2
865 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
867 KBUILD_RUSTFLAGS += -Copt-level=s
870 # Always set `debug-assertions` and `overflow-checks` because their default
871 # depends on `opt-level` and `debug-assertions`, respectively.
872 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
873 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
875 # Tell gcc to never replace conditional load with a non-conditional one
876 ifdef CONFIG_CC_IS_GCC
877 # gcc-10 renamed --param=allow-store-data-races=0 to
878 # -fno-allow-store-data-races.
879 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
880 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
883 ifdef CONFIG_READABLE_ASM
884 # Disable optimizations that make assembler listings hard to read.
885 # reorder blocks reorders the control in the function
886 # ipa clone creates specialized cloned functions
887 # partial inlining inlines only parts of functions
888 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
891 stackp-flags-y := -fno-stack-protector
892 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
893 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
895 KBUILD_CFLAGS += $(stackp-flags-y)
897 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
898 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
900 ifdef CONFIG_FRAME_POINTER
901 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
902 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
904 # Some targets (ARM with Thumb2, for example), can't be built with frame
905 # pointers. For those, we don't have FUNCTION_TRACER automatically
906 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
907 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
908 # -fomit-frame-pointer with FUNCTION_TRACER.
909 # In the Rust target specification, "frame-pointer" is set explicitly
911 ifndef CONFIG_FUNCTION_TRACER
912 KBUILD_CFLAGS += -fomit-frame-pointer
916 # Initialize all stack variables with a 0xAA pattern.
917 ifdef CONFIG_INIT_STACK_ALL_PATTERN
918 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
921 # Initialize all stack variables with a zero value.
922 ifdef CONFIG_INIT_STACK_ALL_ZERO
923 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
924 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
925 # https://github.com/llvm/llvm-project/issues/44842
926 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
927 export CC_AUTO_VAR_INIT_ZERO_ENABLER
928 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
932 # Explicitly clear padding bits during variable initialization
933 KBUILD_CFLAGS += $(call cc-option,-fzero-init-padding-bits=all)
935 # While VLAs have been removed, GCC produces unreachable stack probes
936 # for the randomize_kstack_offset feature. Disable it for all compilers.
937 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
939 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
940 ifdef CONFIG_ZERO_CALL_USED_REGS
941 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
944 ifdef CONFIG_FUNCTION_TRACER
945 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
946 CC_FLAGS_FTRACE += -mrecord-mcount
947 ifdef CONFIG_HAVE_NOP_MCOUNT
948 ifeq ($(call cc-option-yn, -mnop-mcount),y)
949 CC_FLAGS_FTRACE += -mnop-mcount
950 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
954 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
955 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
956 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
959 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
960 ifdef CONFIG_HAVE_C_RECORDMCOUNT
961 BUILD_C_RECORDMCOUNT := y
962 export BUILD_C_RECORDMCOUNT
965 ifdef CONFIG_HAVE_FENTRY
966 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
967 ifeq ($(call cc-option-yn, -mfentry),y)
968 CC_FLAGS_FTRACE += -mfentry
969 CC_FLAGS_USING += -DCC_USING_FENTRY
972 export CC_FLAGS_FTRACE
973 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
974 KBUILD_AFLAGS += $(CC_FLAGS_USING)
977 # We trigger additional mismatches with less inlining
978 ifdef CONFIG_DEBUG_SECTION_MISMATCH
979 KBUILD_CFLAGS += -fno-inline-functions-called-once
982 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
983 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
984 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
985 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
986 LDFLAGS_vmlinux += --gc-sections
989 ifdef CONFIG_SHADOW_CALL_STACK
990 ifndef CONFIG_DYNAMIC_SCS
991 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
992 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
993 KBUILD_RUSTFLAGS += -Zsanitizer=shadow-call-stack
998 ifdef CONFIG_LTO_CLANG
999 ifdef CONFIG_LTO_CLANG_THIN
1000 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
1002 CC_FLAGS_LTO := -flto
1004 CC_FLAGS_LTO += -fvisibility=hidden
1006 # Limit inlining across translation units to reduce binary size
1007 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
1011 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
1012 KBUILD_AFLAGS += -fno-lto
1016 ifdef CONFIG_CFI_CLANG
1017 CC_FLAGS_CFI := -fsanitize=kcfi
1018 ifdef CONFIG_CFI_ICALL_NORMALIZE_INTEGERS
1019 CC_FLAGS_CFI += -fsanitize-cfi-icall-experimental-normalize-integers
1021 ifdef CONFIG_FINEIBT_BHI
1022 CC_FLAGS_CFI += -fsanitize-kcfi-arity
1025 # Always pass -Zsanitizer-cfi-normalize-integers as CONFIG_RUST selects
1026 # CONFIG_CFI_ICALL_NORMALIZE_INTEGERS.
1027 RUSTC_FLAGS_CFI := -Zsanitizer=kcfi -Zsanitizer-cfi-normalize-integers
1028 KBUILD_RUSTFLAGS += $(RUSTC_FLAGS_CFI)
1029 export RUSTC_FLAGS_CFI
1031 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
1035 # Architectures can define flags to add/remove for floating-point support
1036 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT
1038 export CC_FLAGS_NO_FPU
1040 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
1041 # Set the minimal function alignment. Use the newer GCC option
1042 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
1043 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
1044 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
1045 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
1047 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
1051 # arch Makefile may override CC so keep this after arch Makefile is included
1052 NOSTDINC_FLAGS += -nostdinc
1054 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
1055 # the kernel uses only C99 flexible arrays for dynamically sized trailing
1056 # arrays. Enforce this for everything that may examine structure sizes and
1057 # perform bounds checking.
1058 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
1060 # disable invalid "can't wrap" optimizations for signed / pointers
1061 KBUILD_CFLAGS += -fno-strict-overflow
1063 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
1064 KBUILD_CFLAGS += -fno-stack-check
1066 # conserve stack if available
1067 ifdef CONFIG_CC_IS_GCC
1068 KBUILD_CFLAGS += -fconserve-stack
1071 # Ensure compilers do not transform certain loops into calls to wcslen()
1072 KBUILD_CFLAGS += -fno-builtin-wcslen
1074 # change __FILE__ to the relative path to the source directory
1075 ifdef building_out_of_srctree
1076 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srcroot)/=)
1079 # include additional Makefiles when needed
1080 include-y := scripts/Makefile.extrawarn
1081 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1082 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1083 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1084 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1085 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1086 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1087 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1088 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1089 include-$(CONFIG_AUTOFDO_CLANG) += scripts/Makefile.autofdo
1090 include-$(CONFIG_PROPELLER_CLANG) += scripts/Makefile.propeller
1091 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1093 include $(addprefix $(srctree)/, $(include-y))
1095 # scripts/Makefile.gcc-plugins is intentionally included last.
1096 # Do not add $(call cc-option,...) below this line. When you build the kernel
1097 # from the clean source tree, the GCC plugins do not exist at this point.
1099 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1100 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1101 KBUILD_AFLAGS += $(KAFLAGS)
1102 KBUILD_CFLAGS += $(KCFLAGS)
1103 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1105 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1106 LDFLAGS_vmlinux += --build-id=sha1
1108 KBUILD_LDFLAGS += -z noexecstack
1109 ifeq ($(CONFIG_LD_IS_BFD),y)
1110 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1113 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1114 LDFLAGS_vmlinux += -X
1117 ifeq ($(CONFIG_RELR),y)
1118 # ld.lld before 15 did not support -z pack-relative-relocs.
1119 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1122 # We never want expected sections to be placed heuristically by the
1123 # linker. All sections should be explicitly named in the linker script.
1124 ifdef CONFIG_LD_ORPHAN_WARN
1125 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1128 ifneq ($(CONFIG_ARCH_VMLINUX_NEEDS_RELOCS),)
1129 LDFLAGS_vmlinux += --emit-relocs --discard-none
1132 # Align the bit size of userspace programs with the kernel
1133 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1134 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS))
1136 # userspace programs are linked via the compiler, use the correct linker
1137 ifeq ($(CONFIG_CC_IS_CLANG)$(CONFIG_LD_IS_LLD),yy)
1138 KBUILD_USERLDFLAGS += --ld-path=$(LD)
1141 # make the checker run with the right architecture
1142 CHECKFLAGS += --arch=$(ARCH)
1144 # insure the checker run with the right endianness
1145 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1147 # the checker needs the correct machine size
1148 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1150 # Default kernel image to build when no specific target is given.
1151 # KBUILD_IMAGE may be overruled on the command line or
1152 # set in the environment
1153 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1154 # this default value
1155 export KBUILD_IMAGE ?= vmlinux
1158 # INSTALL_PATH specifies where to place the updated kernel and system map
1159 # images. Default is /boot, but you can set it to other values
1160 export INSTALL_PATH ?= /boot
1163 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1164 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1165 # an argument if needed. Otherwise it defaults to the kernel install path
1167 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1170 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1171 # relocations required by build roots. This is not defined in the
1172 # makefile but the argument can be passed to make if needed.
1175 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1180 ifeq ($(KBUILD_EXTMOD),)
1183 clean-dirs := $(sort . Documentation \
1184 $(patsubst %/,%,$(filter %/, $(core-) \
1185 $(drivers-) $(libs-))))
1187 export ARCH_CORE := $(core-y)
1188 export ARCH_LIB := $(filter %/, $(libs-y))
1189 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1190 # Externally visible symbols (used by link-vmlinux.sh)
1192 KBUILD_VMLINUX_OBJS := built-in.a $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1193 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1195 export KBUILD_VMLINUX_LIBS
1196 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1198 ifdef CONFIG_TRIM_UNUSED_KSYMS
1199 # For the kernel to actually contain only the needed exported symbols,
1200 # we have to build modules as well to determine what those symbols are.
1204 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1205 quiet_cmd_ar_vmlinux.a = AR $@
1206 cmd_ar_vmlinux.a = \
1208 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1209 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1211 targets += vmlinux.a
1212 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1213 $(call if_changed,ar_vmlinux.a)
1216 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1217 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1219 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1223 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1224 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1225 # unrelated; the decompressors just happen to have the same base name,
1226 # arch/*/boot/compressed/vmlinux.
1227 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1229 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1230 # https://savannah.gnu.org/bugs/?61463
1231 # For Make > 4.4, the following simple code will work:
1232 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1233 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1234 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1235 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1236 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1238 # The actual objects are generated when descending,
1239 # make sure no implicit rule kicks in
1240 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1242 ifeq ($(origin KERNELRELEASE),file)
1243 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1245 filechk_kernel.release = echo $(KERNELRELEASE)
1248 # Store (new) KERNELRELEASE string in include/config/kernel.release
1249 include/config/kernel.release: FORCE
1250 $(call filechk,kernel.release)
1252 # Additional helpers built in scripts/
1253 # Carefully list dependencies so we do not try to build scripts twice
1256 scripts: scripts_basic scripts_dtc
1257 $(Q)$(MAKE) $(build)=$(@)
1259 # Things we need to do before we recursively start building the kernel
1260 # or the modules are listed in "prepare".
1261 # A multi level approach is used. prepareN is processed before prepareN-1.
1262 # archprepare is used in arch Makefiles and when processed asm symlink,
1263 # version.h and scripts_basic is processed / created.
1265 PHONY += prepare archprepare
1267 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1268 asm-generic $(version_h) include/generated/utsrelease.h \
1269 include/generated/compile.h include/generated/autoconf.h \
1270 include/generated/rustc_cfg remove-stale-files
1272 prepare0: archprepare
1273 $(Q)$(MAKE) $(build)=scripts/mod
1274 $(Q)$(MAKE) $(build)=. prepare
1276 # All the preparing..
1279 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1280 $(Q)$(MAKE) $(build)=rust
1283 PHONY += remove-stale-files
1285 $(Q)$(srctree)/scripts/remove-stale-files
1287 # Support for using generic headers in asm-generic
1288 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1290 PHONY += asm-generic uapi-asm-generic
1291 asm-generic: uapi-asm-generic
1292 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1293 generic=include/asm-generic
1295 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1296 generic=include/uapi/asm-generic
1298 # Generate some files
1299 # ---------------------------------------------------------------------------
1301 # KERNELRELEASE can change from a few different places, meaning version.h
1302 # needs to be updated, so this check is forced on all builds
1305 define filechk_utsrelease.h
1306 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1307 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1310 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1313 define filechk_version.h
1314 if [ $(SUBLEVEL) -gt 255 ]; then \
1315 echo \#define LINUX_VERSION_CODE $(shell \
1316 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1318 echo \#define LINUX_VERSION_CODE $(shell \
1319 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1321 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1322 ((c) > 255 ? 255 : (c)))'; \
1323 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1324 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1325 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1328 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1329 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1331 $(call filechk,version.h)
1333 include/generated/utsrelease.h: include/config/kernel.release FORCE
1334 $(call filechk,utsrelease.h)
1336 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1337 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1339 include/generated/compile.h: FORCE
1340 $(call filechk,compile.h)
1344 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1345 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1347 # ---------------------------------------------------------------------------
1350 #Default location for installed headers
1351 export INSTALL_HDR_PATH = $(objtree)/usr
1353 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1354 cmd_headers_install = \
1355 mkdir -p $(INSTALL_HDR_PATH); \
1356 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1357 usr/include $(INSTALL_HDR_PATH)
1359 PHONY += headers_install
1360 headers_install: headers
1361 $(call cmd,headers_install)
1363 PHONY += archheaders archscripts
1365 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1368 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders
1370 $(Q)$(MAKE) -f $(srctree)/Makefile HEADER_ARCH= SRCARCH=$(HEADER_ARCH) headers
1372 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1373 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1376 ifdef CONFIG_HEADERS_INSTALL
1380 PHONY += scripts_unifdef
1381 scripts_unifdef: scripts_basic
1382 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1384 PHONY += scripts_gen_packed_field_checks
1385 scripts_gen_packed_field_checks: scripts_basic
1386 $(Q)$(MAKE) $(build)=scripts scripts/gen_packed_field_checks
1388 # ---------------------------------------------------------------------------
1391 # Many distributions have the custom install script, /sbin/installkernel.
1392 # If DKMS is installed, 'make install' will eventually recurse back
1393 # to this Makefile to build and install external modules.
1394 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1396 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1397 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1399 # ---------------------------------------------------------------------------
1402 PHONY += vdso_install
1403 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1405 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1407 # ---------------------------------------------------------------------------
1410 ifdef CONFIG_OBJTOOL
1411 prepare: tools/objtool
1415 ifdef CONFIG_DEBUG_INFO_BTF
1416 prepare: tools/bpf/resolve_btfids
1420 # The tools build system is not a part of Kbuild and tends to introduce
1421 # its own unique issues. If you need to integrate a new tool into Kbuild,
1422 # please consider locating that tool outside the tools/ tree and using the
1423 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1424 # here. See Documentation/kbuild/makefiles.rst for details.
1426 PHONY += resolve_btfids_clean
1428 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1430 # tools/bpf/resolve_btfids directory might not exist
1431 # in output directory, skip its clean in that case
1432 resolve_btfids_clean:
1433 ifneq ($(wildcard $(resolve_btfids_O)),)
1434 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1438 $(Q)mkdir -p $(objtree)/tools
1439 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1442 $(Q)mkdir -p $(objtree)/tools
1443 $(Q)$(MAKE) LDFLAGS= O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1445 # ---------------------------------------------------------------------------
1450 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1452 kselftest-%: headers FORCE
1453 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1455 PHONY += kselftest-merge
1457 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1458 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1459 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1460 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1462 # ---------------------------------------------------------------------------
1465 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1466 dtstree := arch/$(SRCARCH)/boot/dts
1472 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1474 %.dtbo: dtbs_prepare
1475 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1477 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1479 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1481 # include/config/kernel.release is actually needed when installing DTBs because
1482 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1483 # dtbs_install depend on it as dtbs_install may run as root.
1484 dtbs_prepare: include/config/kernel.release scripts_dtc
1486 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1490 ifneq ($(CHECK_DTBS),)
1491 dtbs_prepare: dt_binding_schemas
1497 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1499 ifdef CONFIG_OF_EARLY_FLATTREE
1503 ifdef CONFIG_GENERIC_BUILTIN_DTB
1509 PHONY += scripts_dtc
1510 scripts_dtc: scripts_basic
1511 $(Q)$(MAKE) $(build)=scripts/dtc
1513 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1517 PHONY += dt_binding_check dt_binding_schemas
1518 dt_binding_check: dt_binding_schemas scripts_dtc
1519 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1522 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1524 PHONY += dt_compatible_check
1525 dt_compatible_check: dt_binding_schemas
1526 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1528 # ---------------------------------------------------------------------------
1531 ifdef CONFIG_MODULES
1533 # By default, build modules as well
1537 # When we're building modules with modversions, we need to consider
1538 # the built-in objects during the descend as well, in order to
1539 # make sure the checksums are up to date before we record them.
1540 ifdef CONFIG_MODVERSIONS
1547 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1549 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1554 modules: modules_prepare
1556 # Target to prepare building external modules
1557 modules_prepare: prepare
1558 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1560 endif # CONFIG_MODULES
1563 # Cleaning is done on three levels.
1564 # make clean Delete most generated files
1565 # Leave enough to build external modules
1566 # make mrproper Delete the current configuration, and all generated files
1567 # make distclean Remove editor backup files, patch leftover files and the like
1569 # Directories & files removed with 'make clean'
1570 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1571 modules.builtin modules.builtin.modinfo modules.nsdeps \
1572 modules.builtin.ranges vmlinux.o.map vmlinux.unstripped \
1573 compile_commands.json rust/test \
1574 rust-project.json .vmlinux.objs .vmlinux.export.c \
1575 .builtin-dtbs-list .builtin-dtb.S
1577 # Directories & files removed with 'make mrproper'
1578 MRPROPER_FILES += include/config include/generated \
1579 arch/$(SRCARCH)/include/generated .objdiff \
1580 debian snap tar-install PKGBUILD pacman \
1581 .config .config.old .version \
1583 certs/signing_key.pem \
1587 rust/libmacros.so rust/libmacros.dylib
1589 # clean - Delete most, but leave enough to build external modules
1591 clean: private rm-files := $(CLEAN_FILES)
1593 PHONY += archclean vmlinuxclean
1596 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1597 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1599 clean: archclean vmlinuxclean resolve_btfids_clean
1601 # mrproper - Delete all generated files, including .config
1603 mrproper: private rm-files := $(MRPROPER_FILES)
1604 mrproper-dirs := $(addprefix _mrproper_,scripts)
1606 PHONY += $(mrproper-dirs) mrproper
1608 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1610 mrproper: clean $(mrproper-dirs)
1612 @find . $(RCS_FIND_IGNORE) \
1613 \( -name '*.rmeta' \) \
1614 -type f -print | xargs rm -f
1621 @find . $(RCS_FIND_IGNORE) \
1622 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1623 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1624 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1625 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1626 -type f -print | xargs rm -f
1629 # Packaging of the kernel to various formats
1630 # ---------------------------------------------------------------------------
1633 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1634 %pkg: include/config/kernel.release FORCE
1635 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1637 # Brief documentation of the typical targets used
1638 # ---------------------------------------------------------------------------
1640 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1641 boards := $(sort $(notdir $(boards)))
1642 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1643 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1647 @echo 'Cleaning targets:'
1648 @echo ' clean - Remove most generated files but keep the config and'
1649 @echo ' enough build support to build external modules'
1650 @echo ' mrproper - Remove all generated files + config + various backup files'
1651 @echo ' distclean - mrproper + remove editor backup and patch files'
1653 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1655 @echo 'Other generic targets:'
1656 @echo ' all - Build all targets marked with [*]'
1657 @echo '* vmlinux - Build the bare kernel'
1658 @echo '* modules - Build all modules'
1659 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1660 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1661 @echo ' dir/ - Build all files in dir and below'
1662 @echo ' dir/file.[ois] - Build specified target only'
1663 @echo ' dir/file.ll - Build the LLVM assembly file'
1664 @echo ' (requires compiler support for LLVM assembly generation)'
1665 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1666 @echo ' (requires a recent binutils and recent build (System.map))'
1667 @echo ' dir/file.ko - Build module including final link'
1668 @echo ' modules_prepare - Set up for building external modules'
1669 @echo ' tags/TAGS - Generate tags file for editors'
1670 @echo ' cscope - Generate cscope index'
1671 @echo ' gtags - Generate GNU GLOBAL index'
1672 @echo ' kernelrelease - Output the release version string (use with make -s)'
1673 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1674 @echo ' image_name - Output the image name (use with make -s)'
1675 @echo ' headers - Build ready-to-install UAPI headers in usr/include'
1676 @echo ' headers_install - Install sanitised kernel UAPI headers to INSTALL_HDR_PATH'; \
1677 echo ' (default: $(INSTALL_HDR_PATH))'; \
1679 @echo 'Static analysers:'
1680 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1681 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1682 @echo ' versioncheck - Sanity check on version.h usage'
1683 @echo ' includecheck - Check for duplicate included header files'
1684 @echo ' headerdep - Detect inclusion cycles in headers'
1685 @echo ' coccicheck - Check with Coccinelle'
1686 @echo ' clang-analyzer - Check with clang static analyzer'
1687 @echo ' clang-tidy - Check with clang-tidy'
1690 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1692 @echo 'Kernel selftest:'
1693 @echo ' kselftest - Build and run kernel selftest'
1694 @echo ' Build, install, and boot kernel before'
1695 @echo ' running kselftest on it'
1696 @echo ' Run as root for full coverage'
1697 @echo ' kselftest-all - Build kernel selftest'
1698 @echo ' kselftest-install - Build and install kernel selftest'
1699 @echo ' kselftest-clean - Remove all generated kselftest files'
1700 @echo ' kselftest-merge - Merge all the config dependencies of'
1701 @echo ' kselftest to existing .config.'
1703 @echo 'Rust targets:'
1704 @echo ' rustavailable - Checks whether the Rust toolchain is'
1705 @echo ' available and, if not, explains why.'
1706 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1707 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1708 @echo ' is formatted, printing a diff otherwise.'
1709 @echo ' rustdoc - Generate Rust documentation'
1710 @echo ' (requires kernel .config)'
1711 @echo ' rusttest - Runs the Rust tests'
1712 @echo ' (requires kernel .config; downloads external repos)'
1713 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1714 @echo ' (requires kernel .config)'
1715 @echo ' dir/file.[os] - Build specified target only'
1716 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1717 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1718 @echo ' The output is not intended to be compilable.'
1719 @echo ' dir/file.ll - Build the LLVM assembly file'
1722 echo 'Devicetree:'; \
1723 echo '* dtbs - Build device tree blobs for enabled boards'; \
1724 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1725 echo ' dt_binding_check - Validate device tree binding documents and examples'; \
1726 echo ' dt_binding_schemas - Build processed device tree binding schemas'; \
1727 echo ' dtbs_check - Validate device tree source files';\
1730 @echo 'Userspace tools targets:'
1731 @echo ' use "make tools/help"'
1732 @echo ' or "cd tools; make help"'
1734 @echo 'Kernel packaging:'
1735 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1737 @echo 'Documentation targets:'
1738 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1740 @echo 'Architecture-specific targets ($(SRCARCH)):'
1742 echo ' No architecture-specific help defined for $(SRCARCH)')
1745 $(foreach b, $(boards), \
1746 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1748 @$(if $(board-dirs), \
1749 $(foreach b, $(board-dirs), \
1750 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1751 printf " %-16s - Show all of the above\\n" help-boards; \
1754 @echo ' make V=n [targets] 1: verbose build'
1755 @echo ' 2: give reason for rebuild of target'
1756 @echo ' V=1 and V=2 can be combined with V=12'
1757 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1758 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1759 @echo ' (sparse by default)'
1760 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1761 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1762 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1763 @echo ' 1: warnings which may be relevant and do not occur too often'
1764 @echo ' 2: warnings which occur quite often but may still be relevant'
1765 @echo ' 3: more obscure warnings, can most likely be ignored'
1766 @echo ' c: extra checks in the configuration stage (Kconfig)'
1767 @echo ' e: warnings are being treated as errors'
1768 @echo ' Multiple levels can be combined with W=12 or W=123'
1770 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1771 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1774 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1775 @echo 'For further info see the ./README file'
1778 help-board-dirs := $(addprefix help-,$(board-dirs))
1780 help-boards: $(help-board-dirs)
1782 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1784 $(help-board-dirs): help-%:
1785 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1786 @$(if $(boards-per-dir), \
1787 $(foreach b, $(boards-per-dir), \
1788 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1792 # Documentation targets
1793 # ---------------------------------------------------------------------------
1794 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1795 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1796 PHONY += $(DOC_TARGETS)
1798 $(Q)$(MAKE) $(build)=Documentation $@
1802 # ---------------------------------------------------------------------------
1804 # "Is Rust available?" target
1805 PHONY += rustavailable
1807 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1809 # Documentation target
1811 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1814 $(Q)$(MAKE) $(build)=rust $@
1819 $(Q)$(MAKE) $(build)=rust $@
1821 # Formatting targets
1822 PHONY += rustfmt rustfmtcheck
1825 $(Q)find $(srctree) $(RCS_FIND_IGNORE) \
1826 -type f -a -name '*.rs' -a ! -name '*generated*' -print \
1827 | xargs $(RUSTFMT) $(rustfmt_flags)
1829 rustfmtcheck: rustfmt_flags = --check
1830 rustfmtcheck: rustfmt
1833 # ---------------------------------------------------------------------------
1837 $(Q)$(srctree)/scripts/misc-check
1841 PHONY += scripts_gdb
1842 scripts_gdb: prepare0
1843 $(Q)$(MAKE) $(build)=scripts/gdb
1844 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1846 ifdef CONFIG_GDB_SCRIPTS
1850 else # KBUILD_EXTMOD
1852 filechk_kernel.release = echo $(KERNELRELEASE)
1855 # External module support.
1856 # When building external modules the kernel used as basis is considered
1857 # read-only, and no consistency checks are made and the make
1858 # system is not used on the basis kernel. If updates are required
1859 # in the basis kernel ordinary make commands (without M=...) must be used.
1861 # We are always building only modules.
1868 clean: private rm-files := Module.symvers modules.nsdeps compile_commands.json
1871 # now expand this into a simple variable to reduce the cost of shell evaluations
1872 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1874 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1875 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1876 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1877 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1882 @echo ' Building external modules.'
1883 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1885 @echo ' modules - default target, build the module(s)'
1886 @echo ' modules_install - install the module'
1887 @echo ' clean - remove generated files in module directory only'
1888 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1891 ifndef CONFIG_MODULES
1892 modules modules_install: __external_modules_error
1893 __external_modules_error:
1895 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1896 @echo >&2 '*** You cannot build or install external modules.'
1901 endif # KBUILD_EXTMOD
1903 # ---------------------------------------------------------------------------
1906 PHONY += modules modules_install modules_sign modules_prepare
1909 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1910 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1912 ifeq ($(CONFIG_MODULE_SIG),y)
1913 # modules_sign is a subset of modules_install.
1914 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1915 modules_sign: modules_install
1920 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1925 ifdef CONFIG_MODULES
1927 modules.order: $(build-dir)
1930 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1931 # This is solely useful to speed up test compiles.
1933 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1934 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1937 PHONY += modules_check
1938 modules_check: modules.order
1939 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1941 else # CONFIG_MODULES
1948 endif # CONFIG_MODULES
1951 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1952 $(if $(KBUILD_MODULES), modules_check)
1953 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1956 # ---------------------------------------------------------------------------
1957 # To build individual files in subdirectories, you can do like this:
1959 # make foo/bar/baz.s
1961 # The supported suffixes for single-target are listed in 'single-targets'
1963 # To build only under specific subdirectories, you can do like this:
1969 # .ko is special because modpost is needed
1970 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1971 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1972 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1974 $(single-ko): single_modules
1976 $(single-no-ko): $(build-dir)
1979 # Remove modules.order when done because it is not the real one.
1980 PHONY += single_modules
1981 single_modules: $(single-no-ko) modules_prepare
1982 $(Q){ $(foreach m, $(single-ko), echo $(m:%.ko=%.o);) } > modules.order
1983 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1984 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1985 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1987 $(Q)rm -f modules.order
1989 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1995 prepare: outputmakefile
1997 # Preset locale variables to speed up the build process. Limit locale
1998 # tweaks to this spot to avoid wrong language settings when running
1999 # make menuconfig etc.
2000 # Error messages still appears in the original language
2001 PHONY += $(build-dir)
2002 $(build-dir): prepare
2003 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
2005 clean-dirs := $(addprefix _clean_, $(clean-dirs))
2006 PHONY += $(clean-dirs) clean
2008 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
2010 clean: $(clean-dirs)
2012 @find . $(RCS_FIND_IGNORE) \
2013 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
2015 -o -name '*.dtb' -o -name '*.dtbo' \
2016 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
2017 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
2018 -o -name '*.dwo' -o -name '*.lst' \
2019 -o -name '*.su' -o -name '*.mod' \
2020 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
2021 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
2022 -o -name '*.asn1.[ch]' \
2023 -o -name '*.symtypes' -o -name 'modules.order' \
2024 -o -name '*.c.[012]*.*' \
2028 -o -name '.tmp_*' -print \
2031 # Generate tags for editors
2032 # ---------------------------------------------------------------------------
2033 quiet_cmd_tags = GEN $@
2034 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
2036 tags TAGS cscope gtags: FORCE
2039 # Generate rust-project.json (a file that describes the structure of non-Cargo
2040 # Rust projects) for rust-analyzer (an implementation of the Language Server
2042 PHONY += rust-analyzer
2044 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
2046 # FIXME: external modules must not descend into a sub-directory of the kernel
2047 $(Q)$(MAKE) $(build)=$(objtree)/rust src=$(srctree)/rust $@
2049 $(Q)$(MAKE) $(build)=rust $@
2052 # Script to generate missing namespace dependencies
2053 # ---------------------------------------------------------------------------
2056 nsdeps: export KBUILD_NSDEPS=1
2058 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
2061 # ---------------------------------------------------------------------------
2063 quiet_cmd_gen_compile_commands = GEN $@
2064 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
2066 compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
2067 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
2068 $(if $(CONFIG_MODULES), modules.order) FORCE
2069 $(call if_changed,gen_compile_commands)
2071 targets += compile_commands.json
2073 PHONY += clang-tidy clang-analyzer
2075 ifdef CONFIG_CC_IS_CLANG
2076 quiet_cmd_clang_tools = CHECK $<
2077 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
2079 clang-tidy clang-analyzer: compile_commands.json
2080 $(call cmd,clang_tools)
2082 clang-tidy clang-analyzer:
2083 @echo "$@ requires CC=clang" >&2
2087 # Scripts to check various things for consistency
2088 # ---------------------------------------------------------------------------
2090 PHONY += includecheck versioncheck coccicheck
2093 find $(srctree)/* $(RCS_FIND_IGNORE) \
2094 -name '*.[hcS]' -type f -print | sort \
2095 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2098 find $(srctree)/* $(RCS_FIND_IGNORE) \
2099 -name '*.[hcS]' -type f -print | sort \
2100 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2103 $(Q)$(BASH) $(srctree)/scripts/$@
2105 PHONY += checkstack kernelrelease kernelversion image_name
2107 # UML needs a little special treatment here. It wants to use the host
2108 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2109 # else wants $(ARCH), including people doing cross-builds, which means
2110 # that $(SUBARCH) doesn't work here.
2112 CHECKSTACK_ARCH := $(SUBARCH)
2114 CHECKSTACK_ARCH := $(ARCH)
2118 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2119 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2122 @$(filechk_kernel.release)
2125 @echo $(KERNELVERSION)
2128 @echo $(KBUILD_IMAGE)
2130 PHONY += run-command
2132 $(Q)$(KBUILD_RUN_COMMAND)
2134 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2135 cmd_rmfiles = rm -rf $(rm-files)
2137 # read saved command lines for existing targets
2138 existing-targets := $(wildcard $(sort $(targets)))
2140 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2142 endif # config-build
2144 endif # need-sub-make
2149 # Declare the contents of the PHONY variable as phony. We keep that
2150 # information in a variable so we can use it in if_changed and friends.