1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 19
4SUBLEVEL = 10
5EXTRAVERSION =
6NAME = Superb Owl
7
8# *DOCUMENTATION*
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.
13
14$(if $(filter __%, $(MAKECMDGOALS)), \
15	$(error targets prefixed with '__' are only for internal use))
16
17# That's our default target when none is given on the command line
18PHONY := __all
19__all:
20
21# We are using a recursive build, so we need to do a little thinking
22# to get the ordering right.
23#
24# Most importantly: sub-Makefiles should only ever modify files in
25# their own directory. If in some directory we have a dependency on
26# a file in another dir (which doesn't happen often, but it's often
27# unavoidable when linking the built-in.a targets which finally
28# turn into vmlinux), we will call a sub make in that other dir, and
29# after that we are sure that everything which is in that other dir
30# is now up to date.
31#
32# The only cases where we need to modify files which have global
33# effects are thus separated out and done before the recursive
34# descending is started. They are now explicitly listed as the
35# prepare rule.
36
37ifneq ($(sub_make_done),1)
38
39# Do not use make's built-in rules and variables
40# (this increases performance and avoids hard-to-debug behaviour)
41MAKEFLAGS += -rR
42
43# Avoid funny character set dependencies
44unexport LC_ALL
45LC_COLLATE=C
46LC_NUMERIC=C
47export LC_COLLATE LC_NUMERIC
48
49# Avoid interference with shell env settings
50unexport GREP_OPTIONS
51
52# Beautify output
53# ---------------------------------------------------------------------------
54#
55# Normally, we echo the whole command before executing it. By making
56# that echo $($(quiet)$(cmd)), we now have the possibility to set
57# $(quiet) to choose other forms of output instead, e.g.
58#
59#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
60#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
61#
62# If $(quiet) is empty, the whole command will be printed.
63# If it is set to "quiet_", only the short version will be printed.
64# If it is set to "silent_", nothing will be printed at all, since
65# the variable $(silent_cmd_cc_o_c) doesn't exist.
66#
67# A simple variant is to prefix commands with $(Q) - that's useful
68# for commands that shall be hidden in non-verbose mode.
69#
70#	$(Q)ln $@ :<
71#
72# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
73# If KBUILD_VERBOSE equals 1 then the above command is displayed.
74# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
75#
76# To put more focus on warnings, be less verbose as default
77# Use 'make V=1' to see the full commands
78
79ifeq ("$(origin V)", "command line")
80  KBUILD_VERBOSE = $(V)
81endif
82ifndef KBUILD_VERBOSE
83  KBUILD_VERBOSE = 0
84endif
85
86ifeq ($(KBUILD_VERBOSE),1)
87  quiet =
88  Q =
89else
90  quiet=quiet_
91  Q = @
92endif
93
94# If the user is running make -s (silent mode), suppress echoing of
95# commands
96
97ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
98  quiet=silent_
99  KBUILD_VERBOSE = 0
100endif
101
102export quiet Q KBUILD_VERBOSE
103
104# Call a source code checker (by default, "sparse") as part of the
105# C compilation.
106#
107# Use 'make C=1' to enable checking of only re-compiled files.
108# Use 'make C=2' to enable checking of *all* source files, regardless
109# of whether they are re-compiled or not.
110#
111# See the file "Documentation/dev-tools/sparse.rst" for more details,
112# including where to get the "sparse" utility.
113
114ifeq ("$(origin C)", "command line")
115  KBUILD_CHECKSRC = $(C)
116endif
117ifndef KBUILD_CHECKSRC
118  KBUILD_CHECKSRC = 0
119endif
120
121export KBUILD_CHECKSRC
122
123# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
124# directory of external module to build. Setting M= takes precedence.
125ifeq ("$(origin M)", "command line")
126  KBUILD_EXTMOD := $(M)
127endif
128
129$(if $(word 2, $(KBUILD_EXTMOD)), \
130	$(error building multiple external modules is not supported))
131
132# Remove trailing slashes
133ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
134KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
135endif
136
137export KBUILD_EXTMOD
138
139# Kbuild will save output files in the current working directory.
140# This does not need to match to the root of the kernel source tree.
141#
142# For example, you can do this:
143#
144#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
145#
146# If you want to save output files in a different location, there are
147# two syntaxes to specify it.
148#
149# 1) O=
150# Use "make O=dir/to/store/output/files/"
151#
152# 2) Set KBUILD_OUTPUT
153# Set the environment variable KBUILD_OUTPUT to point to the output directory.
154# export KBUILD_OUTPUT=dir/to/store/output/files/; make
155#
156# The O= assignment takes precedence over the KBUILD_OUTPUT environment
157# variable.
158
159# Do we want to change the working directory?
160ifeq ("$(origin O)", "command line")
161  KBUILD_OUTPUT := $(O)
162endif
163
164ifneq ($(KBUILD_OUTPUT),)
165# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
166# expand a shell special character '~'. We use a somewhat tedious way here.
167abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
168$(if $(abs_objtree),, \
169     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
170
171# $(realpath ...) resolves symlinks
172abs_objtree := $(realpath $(abs_objtree))
173else
174abs_objtree := $(CURDIR)
175endif # ifneq ($(KBUILD_OUTPUT),)
176
177ifeq ($(abs_objtree),$(CURDIR))
178# Suppress "Entering directory ..." unless we are changing the work directory.
179MAKEFLAGS += --no-print-directory
180else
181need-sub-make := 1
182endif
183
184this-makefile := $(lastword $(MAKEFILE_LIST))
185abs_srctree := $(realpath $(dir $(this-makefile)))
186
187ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
188$(error source directory cannot contain spaces or colons)
189endif
190
191ifneq ($(abs_srctree),$(abs_objtree))
192# Look for make include files relative to root of kernel src
193#
194# --included-dir is added for backward compatibility, but you should not rely on
195# it. Please add $(srctree)/ prefix to include Makefiles in the source tree.
196MAKEFLAGS += --include-dir=$(abs_srctree)
197endif
198
199ifneq ($(filter 3.%,$(MAKE_VERSION)),)
200# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
201# We need to invoke sub-make to avoid implicit rules in the top Makefile.
202need-sub-make := 1
203# Cancel implicit rules for this Makefile.
204$(this-makefile): ;
205endif
206
207export abs_srctree abs_objtree
208export sub_make_done := 1
209
210ifeq ($(need-sub-make),1)
211
212PHONY += $(MAKECMDGOALS) __sub-make
213
214$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
215	@:
216
217# Invoke a second make in the output directory, passing relevant variables
218__sub-make:
219	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
220
221endif # need-sub-make
222endif # sub_make_done
223
224# We process the rest of the Makefile if this is the final invocation of make
225ifeq ($(need-sub-make),)
226
227# Do not print "Entering directory ...",
228# but we want to display it when entering to the output directory
229# so that IDEs/editors are able to understand relative filenames.
230MAKEFLAGS += --no-print-directory
231
232ifeq ($(abs_srctree),$(abs_objtree))
233        # building in the source tree
234        srctree := .
235	building_out_of_srctree :=
236else
237        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
238                # building in a subdirectory of the source tree
239                srctree := ..
240        else
241                srctree := $(abs_srctree)
242        endif
243	building_out_of_srctree := 1
244endif
245
246ifneq ($(KBUILD_ABS_SRCTREE),)
247srctree := $(abs_srctree)
248endif
249
250objtree		:= .
251VPATH		:= $(srctree)
252
253export building_out_of_srctree srctree objtree VPATH
254
255# To make sure we do not include .config for any of the *config targets
256# catch them early, and hand them over to scripts/kconfig/Makefile
257# It is allowed to specify more targets when calling make, including
258# mixing *config targets and build targets.
259# For example 'make oldconfig all'.
260# Detect when mixed targets is specified, and make a second invocation
261# of make so .config is not included in this case either (for *config).
262
263version_h := include/generated/uapi/linux/version.h
264
265clean-targets := %clean mrproper cleandocs
266no-dot-config-targets := $(clean-targets) \
267			 cscope gtags TAGS tags help% %docs check% coccicheck \
268			 $(version_h) headers headers_% archheaders archscripts \
269			 %asm-generic kernelversion %src-pkg dt_binding_check \
270			 outputmakefile
271# Installation targets should not require compiler. Unfortunately, vdso_install
272# is an exception where build artifacts may be updated. This must be fixed.
273no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
274			headers_install modules_install kernelrelease image_name
275no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
276			  image_name
277single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
278
279config-build	:=
280mixed-build	:=
281need-config	:= 1
282need-compiler	:= 1
283may-sync-config	:= 1
284single-build	:=
285
286ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
287	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
288		need-config :=
289	endif
290endif
291
292ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
293	ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
294		need-compiler :=
295	endif
296endif
297
298ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
299	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
300		may-sync-config :=
301	endif
302endif
303
304ifneq ($(KBUILD_EXTMOD),)
305	may-sync-config :=
306endif
307
308ifeq ($(KBUILD_EXTMOD),)
309        ifneq ($(filter %config,$(MAKECMDGOALS)),)
310		config-build := 1
311                ifneq ($(words $(MAKECMDGOALS)),1)
312			mixed-build := 1
313                endif
314        endif
315endif
316
317# We cannot build single targets and the others at the same time
318ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
319	single-build := 1
320	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
321		mixed-build := 1
322	endif
323endif
324
325# For "make -j clean all", "make -j mrproper defconfig all", etc.
326ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
327        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
328		mixed-build := 1
329        endif
330endif
331
332# install and modules_install need also be processed one by one
333ifneq ($(filter install,$(MAKECMDGOALS)),)
334        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
335		mixed-build := 1
336        endif
337endif
338
339ifdef mixed-build
340# ===========================================================================
341# We're called with mixed targets (*config and build targets).
342# Handle them one by one.
343
344PHONY += $(MAKECMDGOALS) __build_one_by_one
345
346$(MAKECMDGOALS): __build_one_by_one
347	@:
348
349__build_one_by_one:
350	$(Q)set -e; \
351	for i in $(MAKECMDGOALS); do \
352		$(MAKE) -f $(srctree)/Makefile $$i; \
353	done
354
355else # !mixed-build
356
357include $(srctree)/scripts/Kbuild.include
358
359# Read KERNELRELEASE from include/config/kernel.release (if it exists)
360KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
361KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
362export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
363
364include $(srctree)/scripts/subarch.include
365
366# Cross compiling and selecting different set of gcc/bin-utils
367# ---------------------------------------------------------------------------
368#
369# When performing cross compilation for other architectures ARCH shall be set
370# to the target architecture. (See arch/* for the possibilities).
371# ARCH can be set during invocation of make:
372# make ARCH=ia64
373# Another way is to have ARCH set in the environment.
374# The default ARCH is the host where make is executed.
375
376# CROSS_COMPILE specify the prefix used for all executables used
377# during compilation. Only gcc and related bin-utils executables
378# are prefixed with $(CROSS_COMPILE).
379# CROSS_COMPILE can be set on the command line
380# make CROSS_COMPILE=ia64-linux-
381# Alternatively CROSS_COMPILE can be set in the environment.
382# Default value for CROSS_COMPILE is not to prefix executables
383# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
384ARCH		?= $(SUBARCH)
385
386# Architecture as present in compile.h
387UTS_MACHINE 	:= $(ARCH)
388SRCARCH 	:= $(ARCH)
389
390# Additional ARCH settings for x86
391ifeq ($(ARCH),i386)
392        SRCARCH := x86
393endif
394ifeq ($(ARCH),x86_64)
395        SRCARCH := x86
396endif
397
398# Additional ARCH settings for sparc
399ifeq ($(ARCH),sparc32)
400       SRCARCH := sparc
401endif
402ifeq ($(ARCH),sparc64)
403       SRCARCH := sparc
404endif
405
406# Additional ARCH settings for parisc
407ifeq ($(ARCH),parisc64)
408       SRCARCH := parisc
409endif
410
411export cross_compiling :=
412ifneq ($(SRCARCH),$(SUBARCH))
413cross_compiling := 1
414endif
415
416KCONFIG_CONFIG	?= .config
417export KCONFIG_CONFIG
418
419# SHELL used by kbuild
420CONFIG_SHELL := sh
421
422HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
423HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
424HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
425
426ifneq ($(LLVM),)
427ifneq ($(filter %/,$(LLVM)),)
428LLVM_PREFIX := $(LLVM)
429else ifneq ($(filter -%,$(LLVM)),)
430LLVM_SUFFIX := $(LLVM)
431endif
432
433HOSTCC	= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
434HOSTCXX	= $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
435else
436HOSTCC	= gcc
437HOSTCXX	= g++
438endif
439HOSTPKG_CONFIG	= pkg-config
440
441KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
442			 -O2 -fomit-frame-pointer -std=gnu11 \
443			 -Wdeclaration-after-statement
444KBUILD_USERCFLAGS  := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
445KBUILD_USERLDFLAGS := $(USERLDFLAGS)
446
447KBUILD_HOSTCFLAGS   := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
448KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
449KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
450KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
451
452# Make variables (CC, etc...)
453CPP		= $(CC) -E
454ifneq ($(LLVM),)
455CC		= $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
456LD		= $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
457AR		= $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
458NM		= $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
459OBJCOPY		= $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
460OBJDUMP		= $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
461READELF		= $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
462STRIP		= $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
463else
464CC		= $(CROSS_COMPILE)gcc
465LD		= $(CROSS_COMPILE)ld
466AR		= $(CROSS_COMPILE)ar
467NM		= $(CROSS_COMPILE)nm
468OBJCOPY		= $(CROSS_COMPILE)objcopy
469OBJDUMP		= $(CROSS_COMPILE)objdump
470READELF		= $(CROSS_COMPILE)readelf
471STRIP		= $(CROSS_COMPILE)strip
472endif
473PAHOLE		= pahole
474RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
475LEX		= flex
476YACC		= bison
477AWK		= awk
478INSTALLKERNEL  := installkernel
479DEPMOD		= depmod
480PERL		= perl
481PYTHON3		= python3
482CHECK		= sparse
483BASH		= bash
484KGZIP		= gzip
485KBZIP2		= bzip2
486KLZOP		= lzop
487LZMA		= lzma
488LZ4		= lz4c
489XZ		= xz
490ZSTD		= zstd
491
492PAHOLE_FLAGS	= $(shell PAHOLE=$(PAHOLE) $(srctree)/scripts/pahole-flags.sh)
493
494CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
495		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
496NOSTDINC_FLAGS :=
497CFLAGS_MODULE   =
498AFLAGS_MODULE   =
499LDFLAGS_MODULE  =
500CFLAGS_KERNEL	=
501AFLAGS_KERNEL	=
502LDFLAGS_vmlinux =
503
504# Use USERINCLUDE when you must reference the UAPI directories only.
505USERINCLUDE    := \
506		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
507		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
508		-I$(srctree)/include/uapi \
509		-I$(objtree)/include/generated/uapi \
510                -include $(srctree)/include/linux/compiler-version.h \
511                -include $(srctree)/include/linux/kconfig.h
512
513# Use LINUXINCLUDE when you must reference the include/ directory.
514# Needed to be compatible with the O= option
515LINUXINCLUDE    := \
516		-I$(srctree)/arch/$(SRCARCH)/include \
517		-I$(objtree)/arch/$(SRCARCH)/include/generated \
518		$(if $(building_out_of_srctree),-I$(srctree)/include) \
519		-I$(objtree)/include \
520		$(USERINCLUDE)
521
522KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
523KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
524		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
525		   -Werror=implicit-function-declaration -Werror=implicit-int \
526		   -Werror=return-type -Wno-format-security \
527		   -std=gnu11
528KBUILD_CPPFLAGS := -D__KERNEL__
529KBUILD_AFLAGS_KERNEL :=
530KBUILD_CFLAGS_KERNEL :=
531KBUILD_AFLAGS_MODULE  := -DMODULE
532KBUILD_CFLAGS_MODULE  := -DMODULE
533KBUILD_LDFLAGS_MODULE :=
534KBUILD_LDFLAGS :=
535CLANG_FLAGS :=
536
537export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
538export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
539export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
540export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
541export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
542export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
543
544export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
545export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
546export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
547export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
548export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
549export PAHOLE_FLAGS
550
551# Files to ignore in find ... statements
552
553export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
554			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
555			  -prune -o
556export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
557			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
558
559# ===========================================================================
560# Rules shared between *config targets and build targets
561
562# Basic helpers built in scripts/basic/
563PHONY += scripts_basic
564scripts_basic:
565	$(Q)$(MAKE) $(build)=scripts/basic
566
567PHONY += outputmakefile
568ifdef building_out_of_srctree
569# Before starting out-of-tree build, make sure the source tree is clean.
570# outputmakefile generates a Makefile in the output directory, if using a
571# separate output directory. This allows convenient use of make in the
572# output directory.
573# At the same time when output Makefile generated, generate .gitignore to
574# ignore whole output directory
575
576quiet_cmd_makefile = GEN     Makefile
577      cmd_makefile = { \
578	echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
579	echo "include $(srctree)/Makefile"; \
580	} > Makefile
581
582outputmakefile:
583	$(Q)if [ -f $(srctree)/.config -o \
584		 -d $(srctree)/include/config -o \
585		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
586		echo >&2 "***"; \
587		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
588		echo >&2 "*** in $(abs_srctree)";\
589		echo >&2 "***"; \
590		false; \
591	fi
592	$(Q)ln -fsn $(srctree) source
593	$(call cmd,makefile)
594	$(Q)test -e .gitignore || \
595	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
596endif
597
598# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
599# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
600# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
601# and from include/config/auto.conf.cmd to detect the compiler upgrade.
602CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
603
604ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
605include $(srctree)/scripts/Makefile.clang
606endif
607
608# Include this also for config targets because some architectures need
609# cc-cross-prefix to determine CROSS_COMPILE.
610ifdef need-compiler
611include $(srctree)/scripts/Makefile.compiler
612endif
613
614ifdef config-build
615# ===========================================================================
616# *config targets only - make sure prerequisites are updated, and descend
617# in scripts/kconfig to make the *config target
618
619# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
620# KBUILD_DEFCONFIG may point out an alternative default configuration
621# used for 'make defconfig'
622include $(srctree)/arch/$(SRCARCH)/Makefile
623export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
624
625config: outputmakefile scripts_basic FORCE
626	$(Q)$(MAKE) $(build)=scripts/kconfig $@
627
628%config: outputmakefile scripts_basic FORCE
629	$(Q)$(MAKE) $(build)=scripts/kconfig $@
630
631else #!config-build
632# ===========================================================================
633# Build targets only - this includes vmlinux, arch specific targets, clean
634# targets and others. In general all targets except *config targets.
635
636# If building an external module we do not care about the all: rule
637# but instead __all depend on modules
638PHONY += all
639ifeq ($(KBUILD_EXTMOD),)
640__all: all
641else
642__all: modules
643endif
644
645# Decide whether to build built-in, modular, or both.
646# Normally, just do built-in.
647
648KBUILD_MODULES :=
649KBUILD_BUILTIN := 1
650
651# If we have only "make modules", don't compile built-in objects.
652ifeq ($(MAKECMDGOALS),modules)
653  KBUILD_BUILTIN :=
654endif
655
656# If we have "make <whatever> modules", compile modules
657# in addition to whatever we do anyway.
658# Just "make" or "make all" shall build modules as well
659
660ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
661  KBUILD_MODULES := 1
662endif
663
664ifeq ($(MAKECMDGOALS),)
665  KBUILD_MODULES := 1
666endif
667
668export KBUILD_MODULES KBUILD_BUILTIN
669
670ifdef need-config
671include include/config/auto.conf
672endif
673
674ifeq ($(KBUILD_EXTMOD),)
675# Objects we will link into vmlinux / subdirs we need to visit
676core-y		:= init/ usr/ arch/$(SRCARCH)/
677drivers-y	:= drivers/ sound/
678drivers-$(CONFIG_SAMPLES) += samples/
679drivers-$(CONFIG_NET) += net/
680drivers-y	+= virt/
681libs-y		:= lib/
682endif # KBUILD_EXTMOD
683
684# The all: target is the default when no target is given on the
685# command line.
686# This allow a user to issue only 'make' to build a kernel including modules
687# Defaults to vmlinux, but the arch makefile usually adds further targets
688all: vmlinux
689
690CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage
691ifdef CONFIG_CC_IS_GCC
692CFLAGS_GCOV	+= -fno-tree-loop-im
693endif
694export CFLAGS_GCOV
695
696# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
697ifdef CONFIG_FUNCTION_TRACER
698  CC_FLAGS_FTRACE := -pg
699endif
700
701include $(srctree)/arch/$(SRCARCH)/Makefile
702
703ifdef need-config
704ifdef may-sync-config
705# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
706# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
707# because some architectures define CROSS_COMPILE there.
708include include/config/auto.conf.cmd
709
710$(KCONFIG_CONFIG):
711	@echo >&2 '***'
712	@echo >&2 '*** Configuration file "$@" not found!'
713	@echo >&2 '***'
714	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
715	@echo >&2 '*** "make menuconfig" or "make xconfig").'
716	@echo >&2 '***'
717	@/bin/false
718
719# The actual configuration files used during the build are stored in
720# include/generated/ and include/config/. Update them if .config is newer than
721# include/config/auto.conf (which mirrors .config).
722#
723# This exploits the 'multi-target pattern rule' trick.
724# The syncconfig should be executed only once to make all the targets.
725# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
726#
727# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
728# so you cannot notice that Kconfig is waiting for the user input.
729%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
730	$(Q)$(kecho) "  SYNC    $@"
731	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
732else # !may-sync-config
733# External modules and some install targets need include/generated/autoconf.h
734# and include/config/auto.conf but do not care if they are up-to-date.
735# Use auto.conf to trigger the test
736PHONY += include/config/auto.conf
737
738include/config/auto.conf:
739	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
740	echo >&2;							\
741	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
742	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
743	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
744	echo >&2 ;							\
745	/bin/false)
746
747endif # may-sync-config
748endif # need-config
749
750KBUILD_CFLAGS	+= -fno-delete-null-pointer-checks
751KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
752KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
753KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
754KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
755
756ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
757KBUILD_CFLAGS += -O2
758else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
759KBUILD_CFLAGS += -O3
760else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
761KBUILD_CFLAGS += -Os
762endif
763
764# Tell gcc to never replace conditional load with a non-conditional one
765ifdef CONFIG_CC_IS_GCC
766# gcc-10 renamed --param=allow-store-data-races=0 to
767# -fno-allow-store-data-races.
768KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
769KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
770endif
771
772ifdef CONFIG_READABLE_ASM
773# Disable optimizations that make assembler listings hard to read.
774# reorder blocks reorders the control in the function
775# ipa clone creates specialized cloned functions
776# partial inlining inlines only parts of functions
777KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
778endif
779
780ifneq ($(CONFIG_FRAME_WARN),0)
781KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
782endif
783
784stackp-flags-y                                    := -fno-stack-protector
785stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
786stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
787
788KBUILD_CFLAGS += $(stackp-flags-y)
789
790KBUILD_CFLAGS-$(CONFIG_WERROR) += -Werror
791KBUILD_CFLAGS-$(CONFIG_CC_NO_ARRAY_BOUNDS) += -Wno-array-bounds
792KBUILD_CFLAGS += $(KBUILD_CFLAGS-y) $(CONFIG_CC_IMPLICIT_FALLTHROUGH)
793
794ifdef CONFIG_CC_IS_CLANG
795KBUILD_CPPFLAGS += -Qunused-arguments
796# The kernel builds with '-std=gnu11' so use of GNU extensions is acceptable.
797KBUILD_CFLAGS += -Wno-gnu
798else
799
800# gcc inanely warns about local variables called 'main'
801KBUILD_CFLAGS += -Wno-main
802endif
803
804# These warnings generated too much noise in a regular build.
805# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
806KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
807KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
808
809# These result in bogus false positives
810KBUILD_CFLAGS += $(call cc-disable-warning, dangling-pointer)
811
812ifdef CONFIG_FRAME_POINTER
813KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
814else
815# Some targets (ARM with Thumb2, for example), can't be built with frame
816# pointers.  For those, we don't have FUNCTION_TRACER automatically
817# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
818# incompatible with -fomit-frame-pointer with current GCC, so we don't use
819# -fomit-frame-pointer with FUNCTION_TRACER.
820ifndef CONFIG_FUNCTION_TRACER
821KBUILD_CFLAGS	+= -fomit-frame-pointer
822endif
823endif
824
825# Initialize all stack variables with a 0xAA pattern.
826ifdef CONFIG_INIT_STACK_ALL_PATTERN
827KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
828endif
829
830# Initialize all stack variables with a zero value.
831ifdef CONFIG_INIT_STACK_ALL_ZERO
832KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
833ifdef CONFIG_CC_IS_CLANG
834# https://bugs.llvm.org/show_bug.cgi?id=45497
835KBUILD_CFLAGS	+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
836endif
837endif
838
839# While VLAs have been removed, GCC produces unreachable stack probes
840# for the randomize_kstack_offset feature. Disable it for all compilers.
841KBUILD_CFLAGS	+= $(call cc-option, -fno-stack-clash-protection)
842
843# Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
844ifdef CONFIG_ZERO_CALL_USED_REGS
845KBUILD_CFLAGS	+= -fzero-call-used-regs=used-gpr
846endif
847
848ifdef CONFIG_FUNCTION_TRACER
849ifdef CONFIG_FTRACE_MCOUNT_USE_CC
850  CC_FLAGS_FTRACE	+= -mrecord-mcount
851  ifdef CONFIG_HAVE_NOP_MCOUNT
852    ifeq ($(call cc-option-yn, -mnop-mcount),y)
853      CC_FLAGS_FTRACE	+= -mnop-mcount
854      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
855    endif
856  endif
857endif
858ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
859  CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
860endif
861ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
862  ifdef CONFIG_HAVE_C_RECORDMCOUNT
863    BUILD_C_RECORDMCOUNT := y
864    export BUILD_C_RECORDMCOUNT
865  endif
866endif
867ifdef CONFIG_HAVE_FENTRY
868  # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
869  ifeq ($(call cc-option-yn, -mfentry),y)
870    CC_FLAGS_FTRACE	+= -mfentry
871    CC_FLAGS_USING	+= -DCC_USING_FENTRY
872  endif
873endif
874export CC_FLAGS_FTRACE
875KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
876KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
877endif
878
879# We trigger additional mismatches with less inlining
880ifdef CONFIG_DEBUG_SECTION_MISMATCH
881KBUILD_CFLAGS += -fno-inline-functions-called-once
882endif
883
884ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
885KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
886LDFLAGS_vmlinux += --gc-sections
887endif
888
889ifdef CONFIG_SHADOW_CALL_STACK
890CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
891KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
892export CC_FLAGS_SCS
893endif
894
895ifdef CONFIG_LTO_CLANG
896ifdef CONFIG_LTO_CLANG_THIN
897CC_FLAGS_LTO	:= -flto=thin -fsplit-lto-unit
898KBUILD_LDFLAGS	+= --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
899else
900CC_FLAGS_LTO	:= -flto
901endif
902CC_FLAGS_LTO	+= -fvisibility=hidden
903
904# Limit inlining across translation units to reduce binary size
905KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
906
907# Check for frame size exceeding threshold during prolog/epilog insertion
908# when using lld < 13.0.0.
909ifneq ($(CONFIG_FRAME_WARN),0)
910ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
911KBUILD_LDFLAGS	+= -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
912endif
913endif
914endif
915
916ifdef CONFIG_LTO
917KBUILD_CFLAGS	+= -fno-lto $(CC_FLAGS_LTO)
918KBUILD_AFLAGS	+= -fno-lto
919export CC_FLAGS_LTO
920endif
921
922ifdef CONFIG_CFI_CLANG
923CC_FLAGS_CFI	:= -fsanitize=cfi \
924		   -fsanitize-cfi-cross-dso \
925		   -fno-sanitize-cfi-canonical-jump-tables \
926		   -fno-sanitize-trap=cfi \
927		   -fno-sanitize-blacklist
928
929ifdef CONFIG_CFI_PERMISSIVE
930CC_FLAGS_CFI	+= -fsanitize-recover=cfi
931endif
932
933# If LTO flags are filtered out, we must also filter out CFI.
934CC_FLAGS_LTO	+= $(CC_FLAGS_CFI)
935KBUILD_CFLAGS	+= $(CC_FLAGS_CFI)
936export CC_FLAGS_CFI
937endif
938
939ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
940KBUILD_CFLAGS += -falign-functions=64
941endif
942
943# arch Makefile may override CC so keep this after arch Makefile is included
944NOSTDINC_FLAGS += -nostdinc
945
946# warn about C99 declaration after statement
947KBUILD_CFLAGS += -Wdeclaration-after-statement
948
949# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
950KBUILD_CFLAGS += -Wvla
951
952# disable pointer signed / unsigned warnings in gcc 4.0
953KBUILD_CFLAGS += -Wno-pointer-sign
954
955# In order to make sure new function cast mismatches are not introduced
956# in the kernel (to avoid tripping CFI checking), the kernel should be
957# globally built with -Wcast-function-type.
958KBUILD_CFLAGS += $(call cc-option, -Wcast-function-type)
959
960# disable stringop warnings in gcc 8+
961KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
962
963# We'll want to enable this eventually, but it's not going away for 5.7 at least
964KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
965
966# Another good warning that we'll want to enable eventually
967KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
968
969# Enabled with W=2, disabled by default as noisy
970ifdef CONFIG_CC_IS_GCC
971KBUILD_CFLAGS += -Wno-maybe-uninitialized
972endif
973
974ifdef CONFIG_CC_IS_GCC
975# The allocators already balk at large sizes, so silence the compiler
976# warnings for bounds checks involving those possible values. While
977# -Wno-alloc-size-larger-than would normally be used here, earlier versions
978# of gcc (<9.1) weirdly don't handle the option correctly when _other_
979# warnings are produced (?!). Using -Walloc-size-larger-than=SIZE_MAX
980# doesn't work (as it is documented to), silently resolving to "0" prior to
981# version 9.1 (and producing an error more recently). Numeric values larger
982# than PTRDIFF_MAX also don't work prior to version 9.1, which are silently
983# ignored, continuing to default to PTRDIFF_MAX. So, left with no other
984# choice, we must perform a versioned check to disable this warning.
985# https://lore.kernel.org/lkml/20210824115859.187f272f@canb.auug.org.au
986KBUILD_CFLAGS += $(call cc-ifversion, -ge, 0901, -Wno-alloc-size-larger-than)
987endif
988
989# disable invalid "can't wrap" optimizations for signed / pointers
990KBUILD_CFLAGS	+= -fno-strict-overflow
991
992# Make sure -fstack-check isn't enabled (like gentoo apparently did)
993KBUILD_CFLAGS  += -fno-stack-check
994
995# conserve stack if available
996ifdef CONFIG_CC_IS_GCC
997KBUILD_CFLAGS   += -fconserve-stack
998endif
999
1000# Prohibit date/time macros, which would make the build non-deterministic
1001KBUILD_CFLAGS   += -Werror=date-time
1002
1003# enforce correct pointer usage
1004KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
1005
1006# Require designated initializers for all marked structures
1007KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
1008
1009# change __FILE__ to the relative path from the srctree
1010KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1011
1012# include additional Makefiles when needed
1013include-y			:= scripts/Makefile.extrawarn
1014include-$(CONFIG_DEBUG_INFO)	+= scripts/Makefile.debug
1015include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
1016include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
1017include-$(CONFIG_UBSAN)		+= scripts/Makefile.ubsan
1018include-$(CONFIG_KCOV)		+= scripts/Makefile.kcov
1019include-$(CONFIG_RANDSTRUCT)	+= scripts/Makefile.randstruct
1020include-$(CONFIG_GCC_PLUGINS)	+= scripts/Makefile.gcc-plugins
1021
1022include $(addprefix $(srctree)/, $(include-y))
1023
1024# scripts/Makefile.gcc-plugins is intentionally included last.
1025# Do not add $(call cc-option,...) below this line. When you build the kernel
1026# from the clean source tree, the GCC plugins do not exist at this point.
1027
1028# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1029KBUILD_CPPFLAGS += $(KCPPFLAGS)
1030KBUILD_AFLAGS   += $(KAFLAGS)
1031KBUILD_CFLAGS   += $(KCFLAGS)
1032
1033KBUILD_LDFLAGS_MODULE += --build-id=sha1
1034LDFLAGS_vmlinux += --build-id=sha1
1035
1036KBUILD_LDFLAGS	+= -z noexecstack
1037ifeq ($(CONFIG_LD_IS_BFD),y)
1038KBUILD_LDFLAGS	+= $(call ld-option,--no-warn-rwx-segments)
1039endif
1040
1041ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1042LDFLAGS_vmlinux	+= $(call ld-option, -X,)
1043endif
1044
1045ifeq ($(CONFIG_RELR),y)
1046LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr --use-android-relr-tags
1047endif
1048
1049# We never want expected sections to be placed heuristically by the
1050# linker. All sections should be explicitly named in the linker script.
1051ifdef CONFIG_LD_ORPHAN_WARN
1052LDFLAGS_vmlinux += --orphan-handling=warn
1053endif
1054
1055# Align the bit size of userspace programs with the kernel
1056KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1057KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1058
1059# make the checker run with the right architecture
1060CHECKFLAGS += --arch=$(ARCH)
1061
1062# insure the checker run with the right endianness
1063CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1064
1065# the checker needs the correct machine size
1066CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1067
1068# Default kernel image to build when no specific target is given.
1069# KBUILD_IMAGE may be overruled on the command line or
1070# set in the environment
1071# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1072# this default value
1073export KBUILD_IMAGE ?= vmlinux
1074
1075#
1076# INSTALL_PATH specifies where to place the updated kernel and system map
1077# images. Default is /boot, but you can set it to other values
1078export	INSTALL_PATH ?= /boot
1079
1080#
1081# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1082# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1083# an argument if needed. Otherwise it defaults to the kernel install path
1084#
1085export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1086
1087#
1088# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1089# relocations required by build roots.  This is not defined in the
1090# makefile but the argument can be passed to make if needed.
1091#
1092
1093MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1094export MODLIB
1095
1096PHONY += prepare0
1097
1098export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1099export MODORDER := $(extmod_prefix)modules.order
1100export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1101
1102ifeq ($(KBUILD_EXTMOD),)
1103core-y			+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/
1104core-$(CONFIG_BLOCK)	+= block/
1105core-$(CONFIG_IO_URING)	+= io_uring/
1106
1107vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
1108		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1109		     $(libs-y) $(libs-m)))
1110
1111vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1112		     $(patsubst %/,%,$(filter %/, $(core-) \
1113			$(drivers-) $(libs-))))
1114
1115build-dirs	:= $(vmlinux-dirs)
1116clean-dirs	:= $(vmlinux-alldirs)
1117
1118subdir-modorder := $(addsuffix /modules.order, $(build-dirs))
1119
1120# Externally visible symbols (used by link-vmlinux.sh)
1121KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1122KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1123ifdef CONFIG_MODULES
1124KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1125KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1126else
1127KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1128endif
1129KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1130
1131export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1132export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1133# used by scripts/Makefile.package
1134export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1135
1136vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1137
1138# Recurse until adjust_autoksyms.sh is satisfied
1139PHONY += autoksyms_recursive
1140ifdef CONFIG_TRIM_UNUSED_KSYMS
1141# For the kernel to actually contain only the needed exported symbols,
1142# we have to build modules as well to determine what those symbols are.
1143# (this can be evaluated only once include/config/auto.conf has been included)
1144KBUILD_MODULES := 1
1145
1146autoksyms_recursive: descend modules.order
1147	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1148	  "$(MAKE) -f $(srctree)/Makefile autoksyms_recursive"
1149endif
1150
1151autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1152
1153quiet_cmd_autoksyms_h = GEN     $@
1154      cmd_autoksyms_h = mkdir -p $(dir $@); \
1155			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1156
1157$(autoksyms_h):
1158	$(call cmd,autoksyms_h)
1159
1160ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1161
1162# Final link of vmlinux with optional arch pass after final link
1163cmd_link-vmlinux =                                                 \
1164	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1165	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1166
1167vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1168	+$(call if_changed_dep,link-vmlinux)
1169
1170targets := vmlinux
1171
1172# The actual objects are generated when descending,
1173# make sure no implicit rule kicks in
1174$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1175
1176filechk_kernel.release = \
1177	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1178
1179# Store (new) KERNELRELEASE string in include/config/kernel.release
1180include/config/kernel.release: FORCE
1181	$(call filechk,kernel.release)
1182
1183# Additional helpers built in scripts/
1184# Carefully list dependencies so we do not try to build scripts twice
1185# in parallel
1186PHONY += scripts
1187scripts: scripts_basic scripts_dtc
1188	$(Q)$(MAKE) $(build)=$(@)
1189
1190# Things we need to do before we recursively start building the kernel
1191# or the modules are listed in "prepare".
1192# A multi level approach is used. prepareN is processed before prepareN-1.
1193# archprepare is used in arch Makefiles and when processed asm symlink,
1194# version.h and scripts_basic is processed / created.
1195
1196PHONY += prepare archprepare
1197
1198archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1199	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1200	include/generated/autoconf.h remove-stale-files
1201
1202prepare0: archprepare
1203	$(Q)$(MAKE) $(build)=scripts/mod
1204	$(Q)$(MAKE) $(build)=.
1205
1206# All the preparing..
1207prepare: prepare0
1208
1209PHONY += remove-stale-files
1210remove-stale-files:
1211	$(Q)$(srctree)/scripts/remove-stale-files
1212
1213# Support for using generic headers in asm-generic
1214asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1215
1216PHONY += asm-generic uapi-asm-generic
1217asm-generic: uapi-asm-generic
1218	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1219	generic=include/asm-generic
1220uapi-asm-generic:
1221	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1222	generic=include/uapi/asm-generic
1223
1224# Generate some files
1225# ---------------------------------------------------------------------------
1226
1227# KERNELRELEASE can change from a few different places, meaning version.h
1228# needs to be updated, so this check is forced on all builds
1229
1230uts_len := 64
1231define filechk_utsrelease.h
1232	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1233	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1234	  exit 1;                                                         \
1235	fi;                                                               \
1236	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1237endef
1238
1239define filechk_version.h
1240	if [ $(SUBLEVEL) -gt 255 ]; then                                 \
1241		echo \#define LINUX_VERSION_CODE $(shell                 \
1242		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1243	else                                                             \
1244		echo \#define LINUX_VERSION_CODE $(shell                 \
1245		expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1246	fi;                                                              \
1247	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) +  \
1248	((c) > 255 ? 255 : (c)))';                                       \
1249	echo \#define LINUX_VERSION_MAJOR $(VERSION);                    \
1250	echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL);            \
1251	echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1252endef
1253
1254$(version_h): PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1255$(version_h): SUBLEVEL := $(or $(SUBLEVEL), 0)
1256$(version_h): FORCE
1257	$(call filechk,version.h)
1258
1259include/generated/utsrelease.h: include/config/kernel.release FORCE
1260	$(call filechk,utsrelease.h)
1261
1262PHONY += headerdep
1263headerdep:
1264	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1265	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1266
1267# ---------------------------------------------------------------------------
1268# Kernel headers
1269
1270#Default location for installed headers
1271export INSTALL_HDR_PATH = $(objtree)/usr
1272
1273quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1274      cmd_headers_install = \
1275	mkdir -p $(INSTALL_HDR_PATH); \
1276	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1277	usr/include $(INSTALL_HDR_PATH)
1278
1279PHONY += headers_install
1280headers_install: headers
1281	$(call cmd,headers_install)
1282
1283PHONY += archheaders archscripts
1284
1285hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1286
1287PHONY += headers
1288headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1289	$(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1290	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1291	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1292
1293ifdef CONFIG_HEADERS_INSTALL
1294prepare: headers
1295endif
1296
1297PHONY += scripts_unifdef
1298scripts_unifdef: scripts_basic
1299	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1300
1301# ---------------------------------------------------------------------------
1302# Install
1303
1304# Many distributions have the custom install script, /sbin/installkernel.
1305# If DKMS is installed, 'make install' will eventually recurse back
1306# to this Makefile to build and install external modules.
1307# Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1308
1309quiet_cmd_install = INSTALL $(INSTALL_PATH)
1310      cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1311
1312# ---------------------------------------------------------------------------
1313# Tools
1314
1315ifdef CONFIG_OBJTOOL
1316prepare: tools/objtool
1317endif
1318
1319ifdef CONFIG_BPF
1320ifdef CONFIG_DEBUG_INFO_BTF
1321prepare: tools/bpf/resolve_btfids
1322endif
1323endif
1324
1325PHONY += resolve_btfids_clean
1326
1327resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1328
1329# tools/bpf/resolve_btfids directory might not exist
1330# in output directory, skip its clean in that case
1331resolve_btfids_clean:
1332ifneq ($(wildcard $(resolve_btfids_O)),)
1333	$(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1334endif
1335
1336# Clear a bunch of variables before executing the submake
1337ifeq ($(quiet),silent_)
1338tools_silent=s
1339endif
1340
1341tools/: FORCE
1342	$(Q)mkdir -p $(objtree)/tools
1343	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1344
1345tools/%: FORCE
1346	$(Q)mkdir -p $(objtree)/tools
1347	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1348
1349# ---------------------------------------------------------------------------
1350# Kernel selftest
1351
1352PHONY += kselftest
1353kselftest:
1354	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1355
1356kselftest-%: FORCE
1357	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1358
1359PHONY += kselftest-merge
1360kselftest-merge:
1361	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1362	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1363		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1364	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1365
1366# ---------------------------------------------------------------------------
1367# Devicetree files
1368
1369ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1370dtstree := arch/$(SRCARCH)/boot/dts
1371endif
1372
1373ifneq ($(dtstree),)
1374
1375%.dtb: include/config/kernel.release scripts_dtc
1376	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1377
1378%.dtbo: include/config/kernel.release scripts_dtc
1379	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1380
1381PHONY += dtbs dtbs_install dtbs_check
1382dtbs: include/config/kernel.release scripts_dtc
1383	$(Q)$(MAKE) $(build)=$(dtstree)
1384
1385ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1386export CHECK_DTBS=y
1387dtbs: dt_binding_check
1388endif
1389
1390dtbs_check: dtbs
1391
1392dtbs_install:
1393	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1394
1395ifdef CONFIG_OF_EARLY_FLATTREE
1396all: dtbs
1397endif
1398
1399endif
1400
1401PHONY += scripts_dtc
1402scripts_dtc: scripts_basic
1403	$(Q)$(MAKE) $(build)=scripts/dtc
1404
1405ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1406export CHECK_DT_BINDING=y
1407endif
1408
1409PHONY += dt_binding_check
1410dt_binding_check: scripts_dtc
1411	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1412
1413# ---------------------------------------------------------------------------
1414# Modules
1415
1416ifdef CONFIG_MODULES
1417
1418# By default, build modules as well
1419
1420all: modules
1421
1422# When we're building modules with modversions, we need to consider
1423# the built-in objects during the descend as well, in order to
1424# make sure the checksums are up to date before we record them.
1425ifdef CONFIG_MODVERSIONS
1426  KBUILD_BUILTIN := 1
1427endif
1428
1429# Build modules
1430#
1431# A module can be listed more than once in obj-m resulting in
1432# duplicate lines in modules.order files.  Those are removed
1433# using awk while concatenating to the final file.
1434
1435PHONY += modules
1436modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1437
1438cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1439
1440modules.order: $(subdir-modorder) FORCE
1441	$(call if_changed,modules_order)
1442
1443targets += modules.order
1444
1445# Target to prepare building external modules
1446PHONY += modules_prepare
1447modules_prepare: prepare
1448	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
1449
1450export modules_sign_only :=
1451
1452ifeq ($(CONFIG_MODULE_SIG),y)
1453PHONY += modules_sign
1454modules_sign: modules_install
1455	@:
1456
1457# modules_sign is a subset of modules_install.
1458# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1459ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1460modules_sign_only := y
1461endif
1462endif
1463
1464modinst_pre :=
1465ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1466modinst_pre := __modinst_pre
1467endif
1468
1469modules_install: $(modinst_pre)
1470PHONY += __modinst_pre
1471__modinst_pre:
1472	@rm -rf $(MODLIB)/kernel
1473	@rm -f $(MODLIB)/source
1474	@mkdir -p $(MODLIB)/kernel
1475	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1476	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1477		rm -f $(MODLIB)/build ; \
1478		ln -s $(CURDIR) $(MODLIB)/build ; \
1479	fi
1480	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1481	@cp -f modules.builtin $(MODLIB)/
1482	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1483
1484endif # CONFIG_MODULES
1485
1486###
1487# Cleaning is done on three levels.
1488# make clean     Delete most generated files
1489#                Leave enough to build external modules
1490# make mrproper  Delete the current configuration, and all generated files
1491# make distclean Remove editor backup files, patch leftover files and the like
1492
1493# Directories & files removed with 'make clean'
1494CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1495	       modules.builtin modules.builtin.modinfo modules.nsdeps \
1496	       compile_commands.json .thinlto-cache
1497
1498# Directories & files removed with 'make mrproper'
1499MRPROPER_FILES += include/config include/generated          \
1500		  arch/$(SRCARCH)/include/generated .objdiff \
1501		  debian snap tar-install \
1502		  .config .config.old .version \
1503		  Module.symvers \
1504		  certs/signing_key.pem \
1505		  certs/x509.genkey \
1506		  vmlinux-gdb.py \
1507		  *.spec
1508
1509# clean - Delete most, but leave enough to build external modules
1510#
1511clean: rm-files := $(CLEAN_FILES)
1512
1513PHONY += archclean vmlinuxclean
1514
1515vmlinuxclean:
1516	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1517	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1518
1519clean: archclean vmlinuxclean resolve_btfids_clean
1520
1521# mrproper - Delete all generated files, including .config
1522#
1523mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1524mrproper-dirs      := $(addprefix _mrproper_,scripts)
1525
1526PHONY += $(mrproper-dirs) mrproper
1527$(mrproper-dirs):
1528	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1529
1530mrproper: clean $(mrproper-dirs)
1531	$(call cmd,rmfiles)
1532
1533# distclean
1534#
1535PHONY += distclean
1536
1537distclean: mrproper
1538	@find . $(RCS_FIND_IGNORE) \
1539		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1540		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1541		-o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1542		-o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1543		-type f -print | xargs rm -f
1544
1545
1546# Packaging of the kernel to various formats
1547# ---------------------------------------------------------------------------
1548
1549%src-pkg: FORCE
1550	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1551%pkg: include/config/kernel.release FORCE
1552	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1553
1554# Brief documentation of the typical targets used
1555# ---------------------------------------------------------------------------
1556
1557boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1558boards := $(sort $(notdir $(boards)))
1559board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1560board-dirs := $(sort $(notdir $(board-dirs:/=)))
1561
1562PHONY += help
1563help:
1564	@echo  'Cleaning targets:'
1565	@echo  '  clean		  - Remove most generated files but keep the config and'
1566	@echo  '                    enough build support to build external modules'
1567	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1568	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1569	@echo  ''
1570	@echo  'Configuration targets:'
1571	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1572	@echo  ''
1573	@echo  'Other generic targets:'
1574	@echo  '  all		  - Build all targets marked with [*]'
1575	@echo  '* vmlinux	  - Build the bare kernel'
1576	@echo  '* modules	  - Build all modules'
1577	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1578	@echo  '  dir/            - Build all files in dir and below'
1579	@echo  '  dir/file.[ois]  - Build specified target only'
1580	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1581	@echo  '                    (requires compiler support for LLVM assembly generation)'
1582	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1583	@echo  '                    (requires a recent binutils and recent build (System.map))'
1584	@echo  '  dir/file.ko     - Build module including final link'
1585	@echo  '  modules_prepare - Set up for building external modules'
1586	@echo  '  tags/TAGS	  - Generate tags file for editors'
1587	@echo  '  cscope	  - Generate cscope index'
1588	@echo  '  gtags           - Generate GNU GLOBAL index'
1589	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1590	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1591	@echo  '  image_name	  - Output the image name (use with make -s)'
1592	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1593	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1594	 echo  ''
1595	@echo  'Static analysers:'
1596	@echo  '  checkstack      - Generate a list of stack hogs'
1597	@echo  '  versioncheck    - Sanity check on version.h usage'
1598	@echo  '  includecheck    - Check for duplicate included header files'
1599	@echo  '  export_report   - List the usages of all exported symbols'
1600	@echo  '  headerdep       - Detect inclusion cycles in headers'
1601	@echo  '  coccicheck      - Check with Coccinelle'
1602	@echo  '  clang-analyzer  - Check with clang static analyzer'
1603	@echo  '  clang-tidy      - Check with clang-tidy'
1604	@echo  ''
1605	@echo  'Tools:'
1606	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1607	@echo  ''
1608	@echo  'Kernel selftest:'
1609	@echo  '  kselftest         - Build and run kernel selftest'
1610	@echo  '                      Build, install, and boot kernel before'
1611	@echo  '                      running kselftest on it'
1612	@echo  '                      Run as root for full coverage'
1613	@echo  '  kselftest-all     - Build kernel selftest'
1614	@echo  '  kselftest-install - Build and install kernel selftest'
1615	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1616	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1617	@echo  '		      kselftest to existing .config.'
1618	@echo  ''
1619	@$(if $(dtstree), \
1620		echo 'Devicetree:'; \
1621		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1622		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1623		echo '  dt_binding_check - Validate device tree binding documents'; \
1624		echo '  dtbs_check       - Validate device tree source files';\
1625		echo '')
1626
1627	@echo 'Userspace tools targets:'
1628	@echo '  use "make tools/help"'
1629	@echo '  or  "cd tools; make help"'
1630	@echo  ''
1631	@echo  'Kernel packaging:'
1632	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1633	@echo  ''
1634	@echo  'Documentation targets:'
1635	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1636	@echo  ''
1637	@echo  'Architecture specific targets ($(SRCARCH)):'
1638	@$(or $(archhelp),\
1639		echo '  No architecture specific help defined for $(SRCARCH)')
1640	@echo  ''
1641	@$(if $(boards), \
1642		$(foreach b, $(boards), \
1643		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1644		echo '')
1645	@$(if $(board-dirs), \
1646		$(foreach b, $(board-dirs), \
1647		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1648		printf "  %-16s - Show all of the above\\n" help-boards; \
1649		echo '')
1650
1651	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1652	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1653	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1654	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1655	@echo  '                       (sparse by default)'
1656	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1657	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1658	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1659	@echo  '		1: warnings which may be relevant and do not occur too often'
1660	@echo  '		2: warnings which occur quite often but may still be relevant'
1661	@echo  '		3: more obscure warnings, can most likely be ignored'
1662	@echo  '		e: warnings are being treated as errors'
1663	@echo  '		Multiple levels can be combined with W=12 or W=123'
1664	@echo  ''
1665	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1666	@echo  'For further info see the ./README file'
1667
1668
1669help-board-dirs := $(addprefix help-,$(board-dirs))
1670
1671help-boards: $(help-board-dirs)
1672
1673boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1674
1675$(help-board-dirs): help-%:
1676	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1677	@$(if $(boards-per-dir), \
1678		$(foreach b, $(boards-per-dir), \
1679		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1680		echo '')
1681
1682
1683# Documentation targets
1684# ---------------------------------------------------------------------------
1685DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1686	       linkcheckdocs dochelp refcheckdocs
1687PHONY += $(DOC_TARGETS)
1688$(DOC_TARGETS):
1689	$(Q)$(MAKE) $(build)=Documentation $@
1690
1691# Misc
1692# ---------------------------------------------------------------------------
1693
1694PHONY += scripts_gdb
1695scripts_gdb: prepare0
1696	$(Q)$(MAKE) $(build)=scripts/gdb
1697	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1698
1699ifdef CONFIG_GDB_SCRIPTS
1700all: scripts_gdb
1701endif
1702
1703else # KBUILD_EXTMOD
1704
1705###
1706# External module support.
1707# When building external modules the kernel used as basis is considered
1708# read-only, and no consistency checks are made and the make
1709# system is not used on the basis kernel. If updates are required
1710# in the basis kernel ordinary make commands (without M=...) must be used.
1711
1712# We are always building only modules.
1713KBUILD_BUILTIN :=
1714KBUILD_MODULES := 1
1715
1716build-dirs := $(KBUILD_EXTMOD)
1717$(MODORDER): descend
1718	@:
1719
1720compile_commands.json: $(extmod_prefix)compile_commands.json
1721PHONY += compile_commands.json
1722
1723clean-dirs := $(KBUILD_EXTMOD)
1724clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1725	$(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1726
1727PHONY += prepare
1728# now expand this into a simple variable to reduce the cost of shell evaluations
1729prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1730prepare:
1731	@if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1732		echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1733		echo >&2 "  The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1734		echo >&2 "  You are using:           $(CC_VERSION_TEXT)"; \
1735	fi
1736
1737PHONY += help
1738help:
1739	@echo  '  Building external modules.'
1740	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1741	@echo  ''
1742	@echo  '  modules         - default target, build the module(s)'
1743	@echo  '  modules_install - install the module'
1744	@echo  '  clean           - remove generated files in module directory only'
1745	@echo  ''
1746
1747# no-op for external module builds
1748PHONY += modules_prepare
1749
1750endif # KBUILD_EXTMOD
1751
1752# ---------------------------------------------------------------------------
1753# Modules
1754
1755PHONY += modules modules_install
1756
1757ifdef CONFIG_MODULES
1758
1759modules: modules_check
1760	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1761
1762PHONY += modules_check
1763modules_check: $(MODORDER)
1764	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1765
1766quiet_cmd_depmod = DEPMOD  $(MODLIB)
1767      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1768                   $(KERNELRELEASE)
1769
1770modules_install:
1771	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1772	$(call cmd,depmod)
1773
1774else # CONFIG_MODULES
1775
1776# Modules not configured
1777# ---------------------------------------------------------------------------
1778
1779modules modules_install:
1780	@echo >&2 '***'
1781	@echo >&2 '*** The present kernel configuration has modules disabled.'
1782	@echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1783	@echo >&2 '*** to enable CONFIG_MODULES.'
1784	@echo >&2 '***'
1785	@exit 1
1786
1787endif # CONFIG_MODULES
1788
1789# Single targets
1790# ---------------------------------------------------------------------------
1791# To build individual files in subdirectories, you can do like this:
1792#
1793#   make foo/bar/baz.s
1794#
1795# The supported suffixes for single-target are listed in 'single-targets'
1796#
1797# To build only under specific subdirectories, you can do like this:
1798#
1799#   make foo/bar/baz/
1800
1801ifdef single-build
1802
1803# .ko is special because modpost is needed
1804single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1805single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1806		$(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1807
1808$(single-ko): single_modpost
1809	@:
1810$(single-no-ko): descend
1811	@:
1812
1813ifeq ($(KBUILD_EXTMOD),)
1814# For the single build of in-tree modules, use a temporary file to avoid
1815# the situation of modules_install installing an invalid modules.order.
1816MODORDER := .modules.tmp
1817endif
1818
1819PHONY += single_modpost
1820single_modpost: $(single-no-ko) modules_prepare
1821	$(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1822	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1823
1824KBUILD_MODULES := 1
1825
1826export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1827
1828# trim unrelated directories
1829build-dirs := $(foreach d, $(build-dirs), \
1830			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1831
1832endif
1833
1834ifndef CONFIG_MODULES
1835KBUILD_MODULES :=
1836endif
1837
1838# Handle descending into subdirectories listed in $(build-dirs)
1839# Preset locale variables to speed up the build process. Limit locale
1840# tweaks to this spot to avoid wrong language settings when running
1841# make menuconfig etc.
1842# Error messages still appears in the original language
1843PHONY += descend $(build-dirs)
1844descend: $(build-dirs)
1845$(build-dirs): prepare
1846	$(Q)$(MAKE) $(build)=$@ \
1847	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1848	need-builtin=1 need-modorder=1
1849
1850clean-dirs := $(addprefix _clean_, $(clean-dirs))
1851PHONY += $(clean-dirs) clean
1852$(clean-dirs):
1853	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1854
1855clean: $(clean-dirs)
1856	$(call cmd,rmfiles)
1857	@find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1858		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1859		-o -name '*.ko.*' \
1860		-o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1861		-o -name '*.dwo' -o -name '*.lst' \
1862		-o -name '*.su' -o -name '*.mod' -o -name '*.usyms' \
1863		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1864		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1865		-o -name '*.asn1.[ch]' \
1866		-o -name '*.symtypes' -o -name 'modules.order' \
1867		-o -name '.tmp_*' \
1868		-o -name '*.c.[012]*.*' \
1869		-o -name '*.ll' \
1870		-o -name '*.gcno' \
1871		-o -name '*.*.symversions' \) -type f -print | xargs rm -f
1872
1873# Generate tags for editors
1874# ---------------------------------------------------------------------------
1875quiet_cmd_tags = GEN     $@
1876      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1877
1878tags TAGS cscope gtags: FORCE
1879	$(call cmd,tags)
1880
1881# Script to generate missing namespace dependencies
1882# ---------------------------------------------------------------------------
1883
1884PHONY += nsdeps
1885nsdeps: export KBUILD_NSDEPS=1
1886nsdeps: modules
1887	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1888
1889# Clang Tooling
1890# ---------------------------------------------------------------------------
1891
1892quiet_cmd_gen_compile_commands = GEN     $@
1893      cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1894
1895$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1896	$(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1897	$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1898	$(call if_changed,gen_compile_commands)
1899
1900targets += $(extmod_prefix)compile_commands.json
1901
1902PHONY += clang-tidy clang-analyzer
1903
1904ifdef CONFIG_CC_IS_CLANG
1905quiet_cmd_clang_tools = CHECK   $<
1906      cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1907
1908clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1909	$(call cmd,clang_tools)
1910else
1911clang-tidy clang-analyzer:
1912	@echo "$@ requires CC=clang" >&2
1913	@false
1914endif
1915
1916# Scripts to check various things for consistency
1917# ---------------------------------------------------------------------------
1918
1919PHONY += includecheck versioncheck coccicheck export_report
1920
1921includecheck:
1922	find $(srctree)/* $(RCS_FIND_IGNORE) \
1923		-name '*.[hcS]' -type f -print | sort \
1924		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1925
1926versioncheck:
1927	find $(srctree)/* $(RCS_FIND_IGNORE) \
1928		-name '*.[hcS]' -type f -print | sort \
1929		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1930
1931coccicheck:
1932	$(Q)$(BASH) $(srctree)/scripts/$@
1933
1934export_report:
1935	$(PERL) $(srctree)/scripts/export_report.pl
1936
1937PHONY += checkstack kernelrelease kernelversion image_name
1938
1939# UML needs a little special treatment here.  It wants to use the host
1940# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1941# else wants $(ARCH), including people doing cross-builds, which means
1942# that $(SUBARCH) doesn't work here.
1943ifeq ($(ARCH), um)
1944CHECKSTACK_ARCH := $(SUBARCH)
1945else
1946CHECKSTACK_ARCH := $(ARCH)
1947endif
1948checkstack:
1949	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1950	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1951
1952kernelrelease:
1953	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1954
1955kernelversion:
1956	@echo $(KERNELVERSION)
1957
1958image_name:
1959	@echo $(KBUILD_IMAGE)
1960
1961quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1962      cmd_rmfiles = rm -rf $(rm-files)
1963
1964# read saved command lines for existing targets
1965existing-targets := $(wildcard $(sort $(targets)))
1966
1967-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1968
1969endif # config-build
1970endif # mixed-build
1971endif # need-sub-make
1972
1973PHONY += FORCE
1974FORCE:
1975
1976# Declare the contents of the PHONY variable as phony.  We keep that
1977# information in a variable so we can use it in if_changed and friends.
1978.PHONY: $(PHONY)
1979