xref: /openbmc/linux/Makefile (revision a701d28e)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 10
4SUBLEVEL = 0
5EXTRAVERSION = -rc2
6NAME = Kleptomaniac Octopus
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 --%,$(MAKEFLAGS))),)
98  quiet=silent_
99endif
100
101export quiet Q KBUILD_VERBOSE
102
103# Kbuild will save output files in the current working directory.
104# This does not need to match to the root of the kernel source tree.
105#
106# For example, you can do this:
107#
108#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
109#
110# If you want to save output files in a different location, there are
111# two syntaxes to specify it.
112#
113# 1) O=
114# Use "make O=dir/to/store/output/files/"
115#
116# 2) Set KBUILD_OUTPUT
117# Set the environment variable KBUILD_OUTPUT to point to the output directory.
118# export KBUILD_OUTPUT=dir/to/store/output/files/; make
119#
120# The O= assignment takes precedence over the KBUILD_OUTPUT environment
121# variable.
122
123# Do we want to change the working directory?
124ifeq ("$(origin O)", "command line")
125  KBUILD_OUTPUT := $(O)
126endif
127
128ifneq ($(KBUILD_OUTPUT),)
129# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
130# expand a shell special character '~'. We use a somewhat tedious way here.
131abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
132$(if $(abs_objtree),, \
133     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
134
135# $(realpath ...) resolves symlinks
136abs_objtree := $(realpath $(abs_objtree))
137else
138abs_objtree := $(CURDIR)
139endif # ifneq ($(KBUILD_OUTPUT),)
140
141ifeq ($(abs_objtree),$(CURDIR))
142# Suppress "Entering directory ..." unless we are changing the work directory.
143MAKEFLAGS += --no-print-directory
144else
145need-sub-make := 1
146endif
147
148abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
149
150ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
151$(error source directory cannot contain spaces or colons)
152endif
153
154ifneq ($(abs_srctree),$(abs_objtree))
155# Look for make include files relative to root of kernel src
156#
157# This does not become effective immediately because MAKEFLAGS is re-parsed
158# once after the Makefile is read. We need to invoke sub-make.
159MAKEFLAGS += --include-dir=$(abs_srctree)
160need-sub-make := 1
161endif
162
163this-makefile := $(lastword $(MAKEFILE_LIST))
164
165ifneq ($(filter 3.%,$(MAKE_VERSION)),)
166# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
167# We need to invoke sub-make to avoid implicit rules in the top Makefile.
168need-sub-make := 1
169# Cancel implicit rules for this Makefile.
170$(this-makefile): ;
171endif
172
173export abs_srctree abs_objtree
174export sub_make_done := 1
175
176ifeq ($(need-sub-make),1)
177
178PHONY += $(MAKECMDGOALS) __sub-make
179
180$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
181	@:
182
183# Invoke a second make in the output directory, passing relevant variables
184__sub-make:
185	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
186
187endif # need-sub-make
188endif # sub_make_done
189
190# We process the rest of the Makefile if this is the final invocation of make
191ifeq ($(need-sub-make),)
192
193# Do not print "Entering directory ...",
194# but we want to display it when entering to the output directory
195# so that IDEs/editors are able to understand relative filenames.
196MAKEFLAGS += --no-print-directory
197
198# Call a source code checker (by default, "sparse") as part of the
199# C compilation.
200#
201# Use 'make C=1' to enable checking of only re-compiled files.
202# Use 'make C=2' to enable checking of *all* source files, regardless
203# of whether they are re-compiled or not.
204#
205# See the file "Documentation/dev-tools/sparse.rst" for more details,
206# including where to get the "sparse" utility.
207
208ifeq ("$(origin C)", "command line")
209  KBUILD_CHECKSRC = $(C)
210endif
211ifndef KBUILD_CHECKSRC
212  KBUILD_CHECKSRC = 0
213endif
214
215# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
216# directory of external module to build. Setting M= takes precedence.
217ifeq ("$(origin M)", "command line")
218  KBUILD_EXTMOD := $(M)
219endif
220
221$(if $(word 2, $(KBUILD_EXTMOD)), \
222	$(error building multiple external modules is not supported))
223
224export KBUILD_CHECKSRC KBUILD_EXTMOD
225
226extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
227
228ifeq ($(abs_srctree),$(abs_objtree))
229        # building in the source tree
230        srctree := .
231	building_out_of_srctree :=
232else
233        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
234                # building in a subdirectory of the source tree
235                srctree := ..
236        else
237                srctree := $(abs_srctree)
238        endif
239	building_out_of_srctree := 1
240endif
241
242ifneq ($(KBUILD_ABS_SRCTREE),)
243srctree := $(abs_srctree)
244endif
245
246objtree		:= .
247VPATH		:= $(srctree)
248
249export building_out_of_srctree srctree objtree VPATH
250
251# To make sure we do not include .config for any of the *config targets
252# catch them early, and hand them over to scripts/kconfig/Makefile
253# It is allowed to specify more targets when calling make, including
254# mixing *config targets and build targets.
255# For example 'make oldconfig all'.
256# Detect when mixed targets is specified, and make a second invocation
257# of make so .config is not included in this case either (for *config).
258
259version_h := include/generated/uapi/linux/version.h
260old_version_h := include/linux/version.h
261
262clean-targets := %clean mrproper cleandocs
263no-dot-config-targets := $(clean-targets) \
264			 cscope gtags TAGS tags help% %docs check% coccicheck \
265			 $(version_h) headers headers_% archheaders archscripts \
266			 %asm-generic kernelversion %src-pkg dt_binding_check \
267			 outputmakefile
268no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease
269single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
270
271config-build	:=
272mixed-build	:=
273need-config	:= 1
274may-sync-config	:= 1
275single-build	:=
276
277ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
278	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
279		need-config :=
280	endif
281endif
282
283ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
284	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
285		may-sync-config :=
286	endif
287endif
288
289ifneq ($(KBUILD_EXTMOD),)
290	may-sync-config :=
291endif
292
293ifeq ($(KBUILD_EXTMOD),)
294        ifneq ($(filter %config,$(MAKECMDGOALS)),)
295		config-build := 1
296                ifneq ($(words $(MAKECMDGOALS)),1)
297			mixed-build := 1
298                endif
299        endif
300endif
301
302# We cannot build single targets and the others at the same time
303ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
304	single-build := 1
305	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
306		mixed-build := 1
307	endif
308endif
309
310# For "make -j clean all", "make -j mrproper defconfig all", etc.
311ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
312        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
313		mixed-build := 1
314        endif
315endif
316
317# install and modules_install need also be processed one by one
318ifneq ($(filter install,$(MAKECMDGOALS)),)
319        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
320		mixed-build := 1
321        endif
322endif
323
324ifdef mixed-build
325# ===========================================================================
326# We're called with mixed targets (*config and build targets).
327# Handle them one by one.
328
329PHONY += $(MAKECMDGOALS) __build_one_by_one
330
331$(MAKECMDGOALS): __build_one_by_one
332	@:
333
334__build_one_by_one:
335	$(Q)set -e; \
336	for i in $(MAKECMDGOALS); do \
337		$(MAKE) -f $(srctree)/Makefile $$i; \
338	done
339
340else # !mixed-build
341
342include scripts/Kbuild.include
343
344# Read KERNELRELEASE from include/config/kernel.release (if it exists)
345KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
346KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
347export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
348
349include scripts/subarch.include
350
351# Cross compiling and selecting different set of gcc/bin-utils
352# ---------------------------------------------------------------------------
353#
354# When performing cross compilation for other architectures ARCH shall be set
355# to the target architecture. (See arch/* for the possibilities).
356# ARCH can be set during invocation of make:
357# make ARCH=ia64
358# Another way is to have ARCH set in the environment.
359# The default ARCH is the host where make is executed.
360
361# CROSS_COMPILE specify the prefix used for all executables used
362# during compilation. Only gcc and related bin-utils executables
363# are prefixed with $(CROSS_COMPILE).
364# CROSS_COMPILE can be set on the command line
365# make CROSS_COMPILE=ia64-linux-
366# Alternatively CROSS_COMPILE can be set in the environment.
367# Default value for CROSS_COMPILE is not to prefix executables
368# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
369ARCH		?= $(SUBARCH)
370
371# Architecture as present in compile.h
372UTS_MACHINE 	:= $(ARCH)
373SRCARCH 	:= $(ARCH)
374
375# Additional ARCH settings for x86
376ifeq ($(ARCH),i386)
377        SRCARCH := x86
378endif
379ifeq ($(ARCH),x86_64)
380        SRCARCH := x86
381endif
382
383# Additional ARCH settings for sparc
384ifeq ($(ARCH),sparc32)
385       SRCARCH := sparc
386endif
387ifeq ($(ARCH),sparc64)
388       SRCARCH := sparc
389endif
390
391# Additional ARCH settings for sh
392ifeq ($(ARCH),sh64)
393       SRCARCH := sh
394endif
395
396KCONFIG_CONFIG	?= .config
397export KCONFIG_CONFIG
398
399# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
400export KBUILD_DEFCONFIG := defconfig
401
402# SHELL used by kbuild
403CONFIG_SHELL := sh
404
405HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
406HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
407HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
408
409ifneq ($(LLVM),)
410HOSTCC	= clang
411HOSTCXX	= clang++
412else
413HOSTCC	= gcc
414HOSTCXX	= g++
415endif
416
417export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
418			      -O2 -fomit-frame-pointer -std=gnu89
419export KBUILD_USERLDFLAGS :=
420
421KBUILD_HOSTCFLAGS   := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
422KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
423KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
424KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
425
426# Make variables (CC, etc...)
427CPP		= $(CC) -E
428ifneq ($(LLVM),)
429CC		= clang
430LD		= ld.lld
431AR		= llvm-ar
432NM		= llvm-nm
433OBJCOPY		= llvm-objcopy
434OBJDUMP		= llvm-objdump
435READELF		= llvm-readelf
436OBJSIZE		= llvm-size
437STRIP		= llvm-strip
438else
439CC		= $(CROSS_COMPILE)gcc
440LD		= $(CROSS_COMPILE)ld
441AR		= $(CROSS_COMPILE)ar
442NM		= $(CROSS_COMPILE)nm
443OBJCOPY		= $(CROSS_COMPILE)objcopy
444OBJDUMP		= $(CROSS_COMPILE)objdump
445READELF		= $(CROSS_COMPILE)readelf
446OBJSIZE		= $(CROSS_COMPILE)size
447STRIP		= $(CROSS_COMPILE)strip
448endif
449PAHOLE		= pahole
450RESOLVE_BTFIDS	= $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
451LEX		= flex
452YACC		= bison
453AWK		= awk
454INSTALLKERNEL  := installkernel
455DEPMOD		= /sbin/depmod
456PERL		= perl
457PYTHON		= python
458PYTHON3		= python3
459CHECK		= sparse
460BASH		= bash
461KGZIP		= gzip
462KBZIP2		= bzip2
463KLZOP		= lzop
464LZMA		= lzma
465LZ4		= lz4c
466XZ		= xz
467ZSTD		= zstd
468
469CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
470		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
471NOSTDINC_FLAGS :=
472CFLAGS_MODULE   =
473AFLAGS_MODULE   =
474LDFLAGS_MODULE  =
475CFLAGS_KERNEL	=
476AFLAGS_KERNEL	=
477LDFLAGS_vmlinux =
478
479# Use USERINCLUDE when you must reference the UAPI directories only.
480USERINCLUDE    := \
481		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
482		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
483		-I$(srctree)/include/uapi \
484		-I$(objtree)/include/generated/uapi \
485                -include $(srctree)/include/linux/kconfig.h
486
487# Use LINUXINCLUDE when you must reference the include/ directory.
488# Needed to be compatible with the O= option
489LINUXINCLUDE    := \
490		-I$(srctree)/arch/$(SRCARCH)/include \
491		-I$(objtree)/arch/$(SRCARCH)/include/generated \
492		$(if $(building_out_of_srctree),-I$(srctree)/include) \
493		-I$(objtree)/include \
494		$(USERINCLUDE)
495
496KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
497KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
498		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
499		   -Werror=implicit-function-declaration -Werror=implicit-int \
500		   -Werror=return-type -Wno-format-security \
501		   -std=gnu89
502KBUILD_CPPFLAGS := -D__KERNEL__
503KBUILD_AFLAGS_KERNEL :=
504KBUILD_CFLAGS_KERNEL :=
505KBUILD_AFLAGS_MODULE  := -DMODULE
506KBUILD_CFLAGS_MODULE  := -DMODULE
507KBUILD_LDFLAGS_MODULE :=
508KBUILD_LDFLAGS :=
509CLANG_FLAGS :=
510
511export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
512export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
513export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
514export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
515export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
516
517export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
518export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
519export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
520export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
521export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
522
523# Files to ignore in find ... statements
524
525export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
526			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
527			  -prune -o
528export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
529			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
530
531# ===========================================================================
532# Rules shared between *config targets and build targets
533
534# Basic helpers built in scripts/basic/
535PHONY += scripts_basic
536scripts_basic:
537	$(Q)$(MAKE) $(build)=scripts/basic
538	$(Q)rm -f .tmp_quiet_recordmcount
539
540PHONY += outputmakefile
541# Before starting out-of-tree build, make sure the source tree is clean.
542# outputmakefile generates a Makefile in the output directory, if using a
543# separate output directory. This allows convenient use of make in the
544# output directory.
545# At the same time when output Makefile generated, generate .gitignore to
546# ignore whole output directory
547outputmakefile:
548ifdef building_out_of_srctree
549	$(Q)if [ -f $(srctree)/.config -o \
550		 -d $(srctree)/include/config -o \
551		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
552		echo >&2 "***"; \
553		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
554		echo >&2 "*** in $(abs_srctree)";\
555		echo >&2 "***"; \
556		false; \
557	fi
558	$(Q)ln -fsn $(srctree) source
559	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
560	$(Q)test -e .gitignore || \
561	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
562endif
563
564ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
565ifneq ($(CROSS_COMPILE),)
566CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
567GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
568CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
569GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
570endif
571ifneq ($(GCC_TOOLCHAIN),)
572CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
573endif
574ifneq ($(LLVM_IAS),1)
575CLANG_FLAGS	+= -no-integrated-as
576endif
577CLANG_FLAGS	+= -Werror=unknown-warning-option
578KBUILD_CFLAGS	+= $(CLANG_FLAGS)
579KBUILD_AFLAGS	+= $(CLANG_FLAGS)
580export CLANG_FLAGS
581endif
582
583# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
584# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
585# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
586# and from include/config/auto.conf.cmd to detect the compiler upgrade.
587CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
588
589ifdef config-build
590# ===========================================================================
591# *config targets only - make sure prerequisites are updated, and descend
592# in scripts/kconfig to make the *config target
593
594# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
595# KBUILD_DEFCONFIG may point out an alternative default configuration
596# used for 'make defconfig'
597include arch/$(SRCARCH)/Makefile
598export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
599
600config: outputmakefile scripts_basic FORCE
601	$(Q)$(MAKE) $(build)=scripts/kconfig $@
602
603%config: outputmakefile scripts_basic FORCE
604	$(Q)$(MAKE) $(build)=scripts/kconfig $@
605
606else #!config-build
607# ===========================================================================
608# Build targets only - this includes vmlinux, arch specific targets, clean
609# targets and others. In general all targets except *config targets.
610
611# If building an external module we do not care about the all: rule
612# but instead __all depend on modules
613PHONY += all
614ifeq ($(KBUILD_EXTMOD),)
615__all: all
616else
617__all: modules
618endif
619
620# Decide whether to build built-in, modular, or both.
621# Normally, just do built-in.
622
623KBUILD_MODULES :=
624KBUILD_BUILTIN := 1
625
626# If we have only "make modules", don't compile built-in objects.
627ifeq ($(MAKECMDGOALS),modules)
628  KBUILD_BUILTIN :=
629endif
630
631# If we have "make <whatever> modules", compile modules
632# in addition to whatever we do anyway.
633# Just "make" or "make all" shall build modules as well
634
635ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
636  KBUILD_MODULES := 1
637endif
638
639ifeq ($(MAKECMDGOALS),)
640  KBUILD_MODULES := 1
641endif
642
643export KBUILD_MODULES KBUILD_BUILTIN
644
645ifdef need-config
646include include/config/auto.conf
647endif
648
649ifeq ($(KBUILD_EXTMOD),)
650# Objects we will link into vmlinux / subdirs we need to visit
651core-y		:= init/ usr/
652drivers-y	:= drivers/ sound/
653drivers-$(CONFIG_SAMPLES) += samples/
654drivers-y	+= net/ virt/
655libs-y		:= lib/
656endif # KBUILD_EXTMOD
657
658# The all: target is the default when no target is given on the
659# command line.
660# This allow a user to issue only 'make' to build a kernel including modules
661# Defaults to vmlinux, but the arch makefile usually adds further targets
662all: vmlinux
663
664CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
665	$(call cc-option,-fno-tree-loop-im) \
666	$(call cc-disable-warning,maybe-uninitialized,)
667export CFLAGS_GCOV
668
669# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
670ifdef CONFIG_FUNCTION_TRACER
671  CC_FLAGS_FTRACE := -pg
672endif
673
674RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
675RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
676RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
677RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
678RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
679RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
680export RETPOLINE_CFLAGS
681export RETPOLINE_VDSO_CFLAGS
682
683include arch/$(SRCARCH)/Makefile
684
685ifdef need-config
686ifdef may-sync-config
687# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
688# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
689# because some architectures define CROSS_COMPILE there.
690include include/config/auto.conf.cmd
691
692$(KCONFIG_CONFIG):
693	@echo >&2 '***'
694	@echo >&2 '*** Configuration file "$@" not found!'
695	@echo >&2 '***'
696	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
697	@echo >&2 '*** "make menuconfig" or "make xconfig").'
698	@echo >&2 '***'
699	@/bin/false
700
701# The actual configuration files used during the build are stored in
702# include/generated/ and include/config/. Update them if .config is newer than
703# include/config/auto.conf (which mirrors .config).
704#
705# This exploits the 'multi-target pattern rule' trick.
706# The syncconfig should be executed only once to make all the targets.
707# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
708quiet_cmd_syncconfig = SYNC    $@
709      cmd_syncconfig = $(MAKE) -f $(srctree)/Makefile syncconfig
710
711%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
712	+$(call cmd,syncconfig)
713else # !may-sync-config
714# External modules and some install targets need include/generated/autoconf.h
715# and include/config/auto.conf but do not care if they are up-to-date.
716# Use auto.conf to trigger the test
717PHONY += include/config/auto.conf
718
719include/config/auto.conf:
720	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
721	echo >&2;							\
722	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
723	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
724	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
725	echo >&2 ;							\
726	/bin/false)
727
728endif # may-sync-config
729endif # need-config
730
731KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
732KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
733KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
734KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
735KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
736
737ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
738KBUILD_CFLAGS += -O2
739else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
740KBUILD_CFLAGS += -O3
741else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
742KBUILD_CFLAGS += -Os
743endif
744
745# Tell gcc to never replace conditional load with a non-conditional one
746KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
747KBUILD_CFLAGS	+= $(call cc-option,-fno-allow-store-data-races)
748
749ifdef CONFIG_READABLE_ASM
750# Disable optimizations that make assembler listings hard to read.
751# reorder blocks reorders the control in the function
752# ipa clone creates specialized cloned functions
753# partial inlining inlines only parts of functions
754KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
755                 $(call cc-option,-fno-ipa-cp-clone,) \
756                 $(call cc-option,-fno-partial-inlining)
757endif
758
759ifneq ($(CONFIG_FRAME_WARN),0)
760KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
761endif
762
763stackp-flags-y                                    := -fno-stack-protector
764stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
765stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
766
767KBUILD_CFLAGS += $(stackp-flags-y)
768
769ifdef CONFIG_CC_IS_CLANG
770KBUILD_CPPFLAGS += -Qunused-arguments
771KBUILD_CFLAGS += -Wno-format-invalid-specifier
772KBUILD_CFLAGS += -Wno-gnu
773# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
774# source of a reference will be _MergedGlobals and not on of the whitelisted names.
775# See modpost pattern 2
776KBUILD_CFLAGS += -mno-global-merge
777else
778
779# These warnings generated too much noise in a regular build.
780# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
781KBUILD_CFLAGS += -Wno-unused-but-set-variable
782
783# Warn about unmarked fall-throughs in switch statement.
784# Disabled for clang while comment to attribute conversion happens and
785# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
786KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
787endif
788
789KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
790ifdef CONFIG_FRAME_POINTER
791KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
792else
793# Some targets (ARM with Thumb2, for example), can't be built with frame
794# pointers.  For those, we don't have FUNCTION_TRACER automatically
795# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
796# incompatible with -fomit-frame-pointer with current GCC, so we don't use
797# -fomit-frame-pointer with FUNCTION_TRACER.
798ifndef CONFIG_FUNCTION_TRACER
799KBUILD_CFLAGS	+= -fomit-frame-pointer
800endif
801endif
802
803# Initialize all stack variables with a 0xAA pattern.
804ifdef CONFIG_INIT_STACK_ALL_PATTERN
805KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
806endif
807
808# Initialize all stack variables with a zero value.
809ifdef CONFIG_INIT_STACK_ALL_ZERO
810# Future support for zero initialization is still being debated, see
811# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
812# renamed or dropped.
813KBUILD_CFLAGS	+= -ftrivial-auto-var-init=zero
814KBUILD_CFLAGS	+= -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
815endif
816
817# Workaround for GCC versions < 5.0
818# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
819ifdef CONFIG_CC_IS_GCC
820DEBUG_CFLAGS	:= $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
821endif
822
823ifdef CONFIG_DEBUG_INFO
824
825ifdef CONFIG_DEBUG_INFO_SPLIT
826DEBUG_CFLAGS	+= -gsplit-dwarf
827else
828DEBUG_CFLAGS	+= -g
829endif
830
831KBUILD_AFLAGS	+= -Wa,-gdwarf-2
832
833ifdef CONFIG_DEBUG_INFO_DWARF4
834DEBUG_CFLAGS	+= -gdwarf-4
835endif
836
837ifdef CONFIG_DEBUG_INFO_REDUCED
838DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
839		   $(call cc-option,-fno-var-tracking)
840endif
841
842ifdef CONFIG_DEBUG_INFO_COMPRESSED
843DEBUG_CFLAGS	+= -gz=zlib
844KBUILD_AFLAGS	+= -gz=zlib
845KBUILD_LDFLAGS	+= --compress-debug-sections=zlib
846endif
847
848endif # CONFIG_DEBUG_INFO
849
850KBUILD_CFLAGS += $(DEBUG_CFLAGS)
851export DEBUG_CFLAGS
852
853ifdef CONFIG_FUNCTION_TRACER
854ifdef CONFIG_FTRACE_MCOUNT_RECORD
855  # gcc 5 supports generating the mcount tables directly
856  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
857    CC_FLAGS_FTRACE	+= -mrecord-mcount
858    export CC_USING_RECORD_MCOUNT := 1
859  endif
860  ifdef CONFIG_HAVE_NOP_MCOUNT
861    ifeq ($(call cc-option-yn, -mnop-mcount),y)
862      CC_FLAGS_FTRACE	+= -mnop-mcount
863      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
864    endif
865  endif
866endif
867ifdef CONFIG_HAVE_FENTRY
868  ifeq ($(call cc-option-yn, -mfentry),y)
869    CC_FLAGS_FTRACE	+= -mfentry
870    CC_FLAGS_USING	+= -DCC_USING_FENTRY
871  endif
872endif
873export CC_FLAGS_FTRACE
874KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
875KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
876ifdef CONFIG_DYNAMIC_FTRACE
877	ifdef CONFIG_HAVE_C_RECORDMCOUNT
878		BUILD_C_RECORDMCOUNT := y
879		export BUILD_C_RECORDMCOUNT
880	endif
881endif
882endif
883
884# We trigger additional mismatches with less inlining
885ifdef CONFIG_DEBUG_SECTION_MISMATCH
886KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
887endif
888
889ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
890KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
891LDFLAGS_vmlinux += --gc-sections
892endif
893
894ifdef CONFIG_SHADOW_CALL_STACK
895CC_FLAGS_SCS	:= -fsanitize=shadow-call-stack
896KBUILD_CFLAGS	+= $(CC_FLAGS_SCS)
897export CC_FLAGS_SCS
898endif
899
900ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_32B
901KBUILD_CFLAGS += -falign-functions=32
902endif
903
904# arch Makefile may override CC so keep this after arch Makefile is included
905NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
906
907# warn about C99 declaration after statement
908KBUILD_CFLAGS += -Wdeclaration-after-statement
909
910# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
911KBUILD_CFLAGS += -Wvla
912
913# disable pointer signed / unsigned warnings in gcc 4.0
914KBUILD_CFLAGS += -Wno-pointer-sign
915
916# disable stringop warnings in gcc 8+
917KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
918
919# We'll want to enable this eventually, but it's not going away for 5.7 at least
920KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
921KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
922KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
923
924# Another good warning that we'll want to enable eventually
925KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
926
927# Enabled with W=2, disabled by default as noisy
928KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
929
930# disable invalid "can't wrap" optimizations for signed / pointers
931KBUILD_CFLAGS	+= -fno-strict-overflow
932
933# Make sure -fstack-check isn't enabled (like gentoo apparently did)
934KBUILD_CFLAGS  += -fno-stack-check
935
936# conserve stack if available
937KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
938
939# Prohibit date/time macros, which would make the build non-deterministic
940KBUILD_CFLAGS   += -Werror=date-time
941
942# enforce correct pointer usage
943KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
944
945# Require designated initializers for all marked structures
946KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
947
948# change __FILE__ to the relative path from the srctree
949KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
950
951# ensure -fcf-protection is disabled when using retpoline as it is
952# incompatible with -mindirect-branch=thunk-extern
953ifdef CONFIG_RETPOLINE
954KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
955endif
956
957# include additional Makefiles when needed
958include-y			:= scripts/Makefile.extrawarn
959include-$(CONFIG_KASAN)		+= scripts/Makefile.kasan
960include-$(CONFIG_KCSAN)		+= scripts/Makefile.kcsan
961include-$(CONFIG_UBSAN)		+= scripts/Makefile.ubsan
962include-$(CONFIG_KCOV)		+= scripts/Makefile.kcov
963include-$(CONFIG_GCC_PLUGINS)	+= scripts/Makefile.gcc-plugins
964
965include $(addprefix $(srctree)/, $(include-y))
966
967# scripts/Makefile.gcc-plugins is intentionally included last.
968# Do not add $(call cc-option,...) below this line. When you build the kernel
969# from the clean source tree, the GCC plugins do not exist at this point.
970
971# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
972KBUILD_CPPFLAGS += $(KCPPFLAGS)
973KBUILD_AFLAGS   += $(KAFLAGS)
974KBUILD_CFLAGS   += $(KCFLAGS)
975
976KBUILD_LDFLAGS_MODULE += --build-id=sha1
977LDFLAGS_vmlinux += --build-id=sha1
978
979ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
980LDFLAGS_vmlinux	+= $(call ld-option, -X,)
981endif
982
983ifeq ($(CONFIG_RELR),y)
984LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
985endif
986
987# Align the bit size of userspace programs with the kernel
988KBUILD_USERCFLAGS  += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
989KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
990
991# make the checker run with the right architecture
992CHECKFLAGS += --arch=$(ARCH)
993
994# insure the checker run with the right endianness
995CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
996
997# the checker needs the correct machine size
998CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
999
1000# Default kernel image to build when no specific target is given.
1001# KBUILD_IMAGE may be overruled on the command line or
1002# set in the environment
1003# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1004# this default value
1005export KBUILD_IMAGE ?= vmlinux
1006
1007#
1008# INSTALL_PATH specifies where to place the updated kernel and system map
1009# images. Default is /boot, but you can set it to other values
1010export	INSTALL_PATH ?= /boot
1011
1012#
1013# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1014# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1015# an argument if needed. Otherwise it defaults to the kernel install path
1016#
1017export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1018
1019#
1020# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1021# relocations required by build roots.  This is not defined in the
1022# makefile but the argument can be passed to make if needed.
1023#
1024
1025MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1026export MODLIB
1027
1028#
1029# INSTALL_MOD_STRIP, if defined, will cause modules to be
1030# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
1031# the default option --strip-debug will be used.  Otherwise,
1032# INSTALL_MOD_STRIP value will be used as the options to the strip command.
1033
1034ifdef INSTALL_MOD_STRIP
1035ifeq ($(INSTALL_MOD_STRIP),1)
1036mod_strip_cmd = $(STRIP) --strip-debug
1037else
1038mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1039endif # INSTALL_MOD_STRIP=1
1040else
1041mod_strip_cmd = true
1042endif # INSTALL_MOD_STRIP
1043export mod_strip_cmd
1044
1045# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1046# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1047# or CONFIG_MODULE_COMPRESS_XZ.
1048
1049mod_compress_cmd = true
1050ifdef CONFIG_MODULE_COMPRESS
1051  ifdef CONFIG_MODULE_COMPRESS_GZIP
1052    mod_compress_cmd = $(KGZIP) -n -f
1053  endif # CONFIG_MODULE_COMPRESS_GZIP
1054  ifdef CONFIG_MODULE_COMPRESS_XZ
1055    mod_compress_cmd = $(XZ) -f
1056  endif # CONFIG_MODULE_COMPRESS_XZ
1057endif # CONFIG_MODULE_COMPRESS
1058export mod_compress_cmd
1059
1060ifdef CONFIG_MODULE_SIG_ALL
1061$(eval $(call config_filename,MODULE_SIG_KEY))
1062
1063mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1064else
1065mod_sign_cmd = true
1066endif
1067export mod_sign_cmd
1068
1069HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1070
1071has_libelf = $(call try-run,\
1072               echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1073
1074ifdef CONFIG_STACK_VALIDATION
1075  ifeq ($(has_libelf),1)
1076    objtool_target := tools/objtool FORCE
1077  else
1078    SKIP_STACK_VALIDATION := 1
1079    export SKIP_STACK_VALIDATION
1080  endif
1081endif
1082
1083ifdef CONFIG_BPF
1084ifdef CONFIG_DEBUG_INFO_BTF
1085  ifeq ($(has_libelf),1)
1086    resolve_btfids_target := tools/bpf/resolve_btfids FORCE
1087  else
1088    ERROR_RESOLVE_BTFIDS := 1
1089  endif
1090endif # CONFIG_DEBUG_INFO_BTF
1091endif # CONFIG_BPF
1092
1093PHONY += prepare0
1094
1095export MODORDER := $(extmod-prefix)modules.order
1096export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1097
1098ifeq ($(KBUILD_EXTMOD),)
1099core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1100
1101vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, \
1102		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1103		     $(libs-y) $(libs-m)))
1104
1105vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1106		     $(patsubst %/,%,$(filter %/, $(core-) \
1107			$(drivers-) $(libs-))))
1108
1109subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1110			$(core-y) $(core-m) $(libs-y) $(libs-m) \
1111			$(drivers-y) $(drivers-m)))
1112
1113build-dirs	:= $(vmlinux-dirs)
1114clean-dirs	:= $(vmlinux-alldirs)
1115
1116# Externally visible symbols (used by link-vmlinux.sh)
1117KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1118KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1119ifdef CONFIG_MODULES
1120KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1121KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1122else
1123KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1124endif
1125KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1126
1127export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1128export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1129# used by scripts/Makefile.package
1130export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1131
1132vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1133
1134# Recurse until adjust_autoksyms.sh is satisfied
1135PHONY += autoksyms_recursive
1136ifdef CONFIG_TRIM_UNUSED_KSYMS
1137# For the kernel to actually contain only the needed exported symbols,
1138# we have to build modules as well to determine what those symbols are.
1139# (this can be evaluated only once include/config/auto.conf has been included)
1140KBUILD_MODULES := 1
1141
1142autoksyms_recursive: descend modules.order
1143	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1144	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1145endif
1146
1147autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1148
1149quiet_cmd_autoksyms_h = GEN     $@
1150      cmd_autoksyms_h = mkdir -p $(dir $@); \
1151			$(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1152
1153$(autoksyms_h):
1154	$(call cmd,autoksyms_h)
1155
1156ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1157
1158# Final link of vmlinux with optional arch pass after final link
1159cmd_link-vmlinux =                                                 \
1160	$(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)";    \
1161	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1162
1163vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1164	+$(call if_changed,link-vmlinux)
1165
1166targets := vmlinux
1167
1168# The actual objects are generated when descending,
1169# make sure no implicit rule kicks in
1170$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1171
1172filechk_kernel.release = \
1173	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1174
1175# Store (new) KERNELRELEASE string in include/config/kernel.release
1176include/config/kernel.release: FORCE
1177	$(call filechk,kernel.release)
1178
1179# Additional helpers built in scripts/
1180# Carefully list dependencies so we do not try to build scripts twice
1181# in parallel
1182PHONY += scripts
1183scripts: scripts_basic scripts_dtc
1184	$(Q)$(MAKE) $(build)=$(@)
1185
1186# Things we need to do before we recursively start building the kernel
1187# or the modules are listed in "prepare".
1188# A multi level approach is used. prepareN is processed before prepareN-1.
1189# archprepare is used in arch Makefiles and when processed asm symlink,
1190# version.h and scripts_basic is processed / created.
1191
1192PHONY += prepare archprepare
1193
1194archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1195	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1196	include/generated/autoconf.h
1197
1198prepare0: archprepare
1199	$(Q)$(MAKE) $(build)=scripts/mod
1200	$(Q)$(MAKE) $(build)=.
1201
1202# All the preparing..
1203prepare: prepare0 prepare-objtool prepare-resolve_btfids
1204
1205# Support for using generic headers in asm-generic
1206asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1207
1208PHONY += asm-generic uapi-asm-generic
1209asm-generic: uapi-asm-generic
1210	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1211	generic=include/asm-generic
1212uapi-asm-generic:
1213	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1214	generic=include/uapi/asm-generic
1215
1216PHONY += prepare-objtool prepare-resolve_btfids
1217prepare-objtool: $(objtool_target)
1218ifeq ($(SKIP_STACK_VALIDATION),1)
1219ifdef CONFIG_UNWINDER_ORC
1220	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1221	@false
1222else
1223	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1224endif
1225endif
1226
1227prepare-resolve_btfids: $(resolve_btfids_target)
1228ifeq ($(ERROR_RESOLVE_BTFIDS),1)
1229	@echo "error: Cannot resolve BTF IDs for CONFIG_DEBUG_INFO_BTF, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1230	@false
1231endif
1232# Generate some files
1233# ---------------------------------------------------------------------------
1234
1235# KERNELRELEASE can change from a few different places, meaning version.h
1236# needs to be updated, so this check is forced on all builds
1237
1238uts_len := 64
1239define filechk_utsrelease.h
1240	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1241	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1242	  exit 1;                                                         \
1243	fi;                                                               \
1244	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1245endef
1246
1247define filechk_version.h
1248	echo \#define LINUX_VERSION_CODE $(shell                         \
1249	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1250	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1251endef
1252
1253$(version_h): FORCE
1254	$(call filechk,version.h)
1255	$(Q)rm -f $(old_version_h)
1256
1257include/generated/utsrelease.h: include/config/kernel.release FORCE
1258	$(call filechk,utsrelease.h)
1259
1260PHONY += headerdep
1261headerdep:
1262	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1263	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1264
1265# ---------------------------------------------------------------------------
1266# Kernel headers
1267
1268#Default location for installed headers
1269export INSTALL_HDR_PATH = $(objtree)/usr
1270
1271quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1272      cmd_headers_install = \
1273	mkdir -p $(INSTALL_HDR_PATH); \
1274	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1275	usr/include $(INSTALL_HDR_PATH)
1276
1277PHONY += headers_install
1278headers_install: headers
1279	$(call cmd,headers_install)
1280
1281PHONY += archheaders archscripts
1282
1283hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1284
1285PHONY += headers
1286headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1287	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1288	  $(error Headers not exportable for the $(SRCARCH) architecture))
1289	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1290	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1291
1292# Deprecated. It is no-op now.
1293PHONY += headers_check
1294headers_check:
1295	@:
1296
1297ifdef CONFIG_HEADERS_INSTALL
1298prepare: headers
1299endif
1300
1301PHONY += scripts_unifdef
1302scripts_unifdef: scripts_basic
1303	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1304
1305# ---------------------------------------------------------------------------
1306# Kernel selftest
1307
1308PHONY += kselftest
1309kselftest:
1310	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1311
1312kselftest-%: FORCE
1313	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1314
1315PHONY += kselftest-merge
1316kselftest-merge:
1317	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1318	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1319		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1320	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1321
1322# ---------------------------------------------------------------------------
1323# Devicetree files
1324
1325ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1326dtstree := arch/$(SRCARCH)/boot/dts
1327endif
1328
1329ifneq ($(dtstree),)
1330
1331%.dtb: include/config/kernel.release scripts_dtc
1332	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1333
1334PHONY += dtbs dtbs_install dtbs_check
1335dtbs: include/config/kernel.release scripts_dtc
1336	$(Q)$(MAKE) $(build)=$(dtstree)
1337
1338ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1339export CHECK_DTBS=y
1340dtbs: dt_binding_check
1341endif
1342
1343dtbs_check: dtbs
1344
1345dtbs_install:
1346	$(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1347
1348ifdef CONFIG_OF_EARLY_FLATTREE
1349all: dtbs
1350endif
1351
1352endif
1353
1354PHONY += scripts_dtc
1355scripts_dtc: scripts_basic
1356	$(Q)$(MAKE) $(build)=scripts/dtc
1357
1358ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1359export CHECK_DT_BINDING=y
1360endif
1361
1362PHONY += dt_binding_check
1363dt_binding_check: scripts_dtc
1364	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1365
1366# ---------------------------------------------------------------------------
1367# Modules
1368
1369ifdef CONFIG_MODULES
1370
1371# By default, build modules as well
1372
1373all: modules
1374
1375# When we're building modules with modversions, we need to consider
1376# the built-in objects during the descend as well, in order to
1377# make sure the checksums are up to date before we record them.
1378ifdef CONFIG_MODVERSIONS
1379  KBUILD_BUILTIN := 1
1380endif
1381
1382# Build modules
1383#
1384# A module can be listed more than once in obj-m resulting in
1385# duplicate lines in modules.order files.  Those are removed
1386# using awk while concatenating to the final file.
1387
1388PHONY += modules
1389modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1390	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1391
1392PHONY += modules_check
1393modules_check: modules.order
1394	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1395
1396cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1397
1398modules.order: $(subdir-modorder) FORCE
1399	$(call if_changed,modules_order)
1400
1401targets += modules.order
1402
1403# Target to prepare building external modules
1404PHONY += modules_prepare
1405modules_prepare: prepare
1406	$(Q)$(MAKE) $(build)=scripts scripts/module.lds
1407
1408# Target to install modules
1409PHONY += modules_install
1410modules_install: _modinst_ _modinst_post
1411
1412PHONY += _modinst_
1413_modinst_:
1414	@rm -rf $(MODLIB)/kernel
1415	@rm -f $(MODLIB)/source
1416	@mkdir -p $(MODLIB)/kernel
1417	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1418	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1419		rm -f $(MODLIB)/build ; \
1420		ln -s $(CURDIR) $(MODLIB)/build ; \
1421	fi
1422	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1423	@cp -f modules.builtin $(MODLIB)/
1424	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1425	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1426
1427# This depmod is only for convenience to give the initial
1428# boot a modules.dep even before / is mounted read-write.  However the
1429# boot script depmod is the master version.
1430PHONY += _modinst_post
1431_modinst_post: _modinst_
1432	$(call cmd,depmod)
1433
1434ifeq ($(CONFIG_MODULE_SIG), y)
1435PHONY += modules_sign
1436modules_sign:
1437	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1438endif
1439
1440else # CONFIG_MODULES
1441
1442# Modules not configured
1443# ---------------------------------------------------------------------------
1444
1445PHONY += modules modules_install
1446modules modules_install:
1447	@echo >&2
1448	@echo >&2 "The present kernel configuration has modules disabled."
1449	@echo >&2 "Type 'make config' and enable loadable module support."
1450	@echo >&2 "Then build a kernel with module support enabled."
1451	@echo >&2
1452	@exit 1
1453
1454endif # CONFIG_MODULES
1455
1456###
1457# Cleaning is done on three levels.
1458# make clean     Delete most generated files
1459#                Leave enough to build external modules
1460# make mrproper  Delete the current configuration, and all generated files
1461# make distclean Remove editor backup files, patch leftover files and the like
1462
1463# Directories & files removed with 'make clean'
1464CLEAN_FILES += include/ksym vmlinux.symvers \
1465	       modules.builtin modules.builtin.modinfo modules.nsdeps \
1466	       compile_commands.json
1467
1468# Directories & files removed with 'make mrproper'
1469MRPROPER_FILES += include/config include/generated          \
1470		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1471		  debian snap tar-install \
1472		  .config .config.old .version \
1473		  Module.symvers \
1474		  signing_key.pem signing_key.priv signing_key.x509	\
1475		  x509.genkey extra_certificates signing_key.x509.keyid	\
1476		  signing_key.x509.signer vmlinux-gdb.py \
1477		  *.spec
1478
1479# Directories & files removed with 'make distclean'
1480DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1481
1482# clean - Delete most, but leave enough to build external modules
1483#
1484clean: rm-files := $(CLEAN_FILES)
1485
1486PHONY += archclean vmlinuxclean
1487
1488vmlinuxclean:
1489	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1490	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1491
1492clean: archclean vmlinuxclean
1493
1494# mrproper - Delete all generated files, including .config
1495#
1496mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1497mrproper-dirs      := $(addprefix _mrproper_,scripts)
1498
1499PHONY += $(mrproper-dirs) mrproper
1500$(mrproper-dirs):
1501	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1502
1503mrproper: clean $(mrproper-dirs)
1504	$(call cmd,rmfiles)
1505
1506# distclean
1507#
1508distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1509
1510PHONY += distclean
1511
1512distclean: mrproper
1513	$(call cmd,rmfiles)
1514	@find $(srctree) $(RCS_FIND_IGNORE) \
1515		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1516		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1517		-o -name 'core' \) \
1518		-type f -print | xargs rm -f
1519
1520
1521# Packaging of the kernel to various formats
1522# ---------------------------------------------------------------------------
1523
1524%src-pkg: FORCE
1525	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1526%pkg: include/config/kernel.release FORCE
1527	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1528
1529# Brief documentation of the typical targets used
1530# ---------------------------------------------------------------------------
1531
1532boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1533boards := $(sort $(notdir $(boards)))
1534board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1535board-dirs := $(sort $(notdir $(board-dirs:/=)))
1536
1537PHONY += help
1538help:
1539	@echo  'Cleaning targets:'
1540	@echo  '  clean		  - Remove most generated files but keep the config and'
1541	@echo  '                    enough build support to build external modules'
1542	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1543	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1544	@echo  ''
1545	@echo  'Configuration targets:'
1546	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1547	@echo  ''
1548	@echo  'Other generic targets:'
1549	@echo  '  all		  - Build all targets marked with [*]'
1550	@echo  '* vmlinux	  - Build the bare kernel'
1551	@echo  '* modules	  - Build all modules'
1552	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1553	@echo  '  dir/            - Build all files in dir and below'
1554	@echo  '  dir/file.[ois]  - Build specified target only'
1555	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1556	@echo  '                    (requires compiler support for LLVM assembly generation)'
1557	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1558	@echo  '                    (requires a recent binutils and recent build (System.map))'
1559	@echo  '  dir/file.ko     - Build module including final link'
1560	@echo  '  modules_prepare - Set up for building external modules'
1561	@echo  '  tags/TAGS	  - Generate tags file for editors'
1562	@echo  '  cscope	  - Generate cscope index'
1563	@echo  '  gtags           - Generate GNU GLOBAL index'
1564	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1565	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1566	@echo  '  image_name	  - Output the image name (use with make -s)'
1567	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1568	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1569	 echo  ''
1570	@echo  'Static analysers:'
1571	@echo  '  checkstack      - Generate a list of stack hogs'
1572	@echo  '  versioncheck    - Sanity check on version.h usage'
1573	@echo  '  includecheck    - Check for duplicate included header files'
1574	@echo  '  export_report   - List the usages of all exported symbols'
1575	@echo  '  headerdep       - Detect inclusion cycles in headers'
1576	@echo  '  coccicheck      - Check with Coccinelle'
1577	@echo  '  clang-analyzer  - Check with clang static analyzer'
1578	@echo  '  clang-tidy      - Check with clang-tidy'
1579	@echo  ''
1580	@echo  'Tools:'
1581	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1582	@echo  ''
1583	@echo  'Kernel selftest:'
1584	@echo  '  kselftest         - Build and run kernel selftest'
1585	@echo  '                      Build, install, and boot kernel before'
1586	@echo  '                      running kselftest on it'
1587	@echo  '                      Run as root for full coverage'
1588	@echo  '  kselftest-all     - Build kernel selftest'
1589	@echo  '  kselftest-install - Build and install kernel selftest'
1590	@echo  '  kselftest-clean   - Remove all generated kselftest files'
1591	@echo  '  kselftest-merge   - Merge all the config dependencies of'
1592	@echo  '		      kselftest to existing .config.'
1593	@echo  ''
1594	@$(if $(dtstree), \
1595		echo 'Devicetree:'; \
1596		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1597		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1598		echo '  dt_binding_check - Validate device tree binding documents'; \
1599		echo '  dtbs_check       - Validate device tree source files';\
1600		echo '')
1601
1602	@echo 'Userspace tools targets:'
1603	@echo '  use "make tools/help"'
1604	@echo '  or  "cd tools; make help"'
1605	@echo  ''
1606	@echo  'Kernel packaging:'
1607	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1608	@echo  ''
1609	@echo  'Documentation targets:'
1610	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1611	@echo  ''
1612	@echo  'Architecture specific targets ($(SRCARCH)):'
1613	@$(if $(archhelp),$(archhelp),\
1614		echo '  No architecture specific help defined for $(SRCARCH)')
1615	@echo  ''
1616	@$(if $(boards), \
1617		$(foreach b, $(boards), \
1618		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1619		echo '')
1620	@$(if $(board-dirs), \
1621		$(foreach b, $(board-dirs), \
1622		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1623		printf "  %-16s - Show all of the above\\n" help-boards; \
1624		echo '')
1625
1626	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1627	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1628	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1629	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1630	@echo  '                       (sparse by default)'
1631	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1632	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1633	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1634	@echo  '		1: warnings which may be relevant and do not occur too often'
1635	@echo  '		2: warnings which occur quite often but may still be relevant'
1636	@echo  '		3: more obscure warnings, can most likely be ignored'
1637	@echo  '		Multiple levels can be combined with W=12 or W=123'
1638	@echo  ''
1639	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1640	@echo  'For further info see the ./README file'
1641
1642
1643help-board-dirs := $(addprefix help-,$(board-dirs))
1644
1645help-boards: $(help-board-dirs)
1646
1647boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1648
1649$(help-board-dirs): help-%:
1650	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1651	@$(if $(boards-per-dir), \
1652		$(foreach b, $(boards-per-dir), \
1653		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1654		echo '')
1655
1656
1657# Documentation targets
1658# ---------------------------------------------------------------------------
1659DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1660	       linkcheckdocs dochelp refcheckdocs
1661PHONY += $(DOC_TARGETS)
1662$(DOC_TARGETS):
1663	$(Q)$(MAKE) $(build)=Documentation $@
1664
1665# Misc
1666# ---------------------------------------------------------------------------
1667
1668PHONY += scripts_gdb
1669scripts_gdb: prepare0
1670	$(Q)$(MAKE) $(build)=scripts/gdb
1671	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1672
1673ifdef CONFIG_GDB_SCRIPTS
1674all: scripts_gdb
1675endif
1676
1677else # KBUILD_EXTMOD
1678
1679###
1680# External module support.
1681# When building external modules the kernel used as basis is considered
1682# read-only, and no consistency checks are made and the make
1683# system is not used on the basis kernel. If updates are required
1684# in the basis kernel ordinary make commands (without M=...) must
1685# be used.
1686#
1687# The following are the only valid targets when building external
1688# modules.
1689# make M=dir clean     Delete all automatically generated files
1690# make M=dir modules   Make all modules in specified dir
1691# make M=dir	       Same as 'make M=dir modules'
1692# make M=dir modules_install
1693#                      Install the modules built in the module directory
1694#                      Assumes install directory is already created
1695
1696# We are always building only modules.
1697KBUILD_BUILTIN :=
1698KBUILD_MODULES := 1
1699
1700build-dirs := $(KBUILD_EXTMOD)
1701PHONY += modules
1702modules: $(MODORDER)
1703	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1704
1705$(MODORDER): descend
1706	@:
1707
1708PHONY += modules_install
1709modules_install: _emodinst_ _emodinst_post
1710
1711install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1712PHONY += _emodinst_
1713_emodinst_:
1714	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1715	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1716
1717PHONY += _emodinst_post
1718_emodinst_post: _emodinst_
1719	$(call cmd,depmod)
1720
1721compile_commands.json: $(extmod-prefix)compile_commands.json
1722PHONY += compile_commands.json
1723
1724clean-dirs := $(KBUILD_EXTMOD)
1725clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1726	$(KBUILD_EXTMOD)/compile_commands.json
1727
1728PHONY += help
1729help:
1730	@echo  '  Building external modules.'
1731	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1732	@echo  ''
1733	@echo  '  modules         - default target, build the module(s)'
1734	@echo  '  modules_install - install the module'
1735	@echo  '  clean           - remove generated files in module directory only'
1736	@echo  ''
1737
1738# no-op for external module builds
1739PHONY += prepare modules_prepare
1740
1741endif # KBUILD_EXTMOD
1742
1743# Single targets
1744# ---------------------------------------------------------------------------
1745# To build individual files in subdirectories, you can do like this:
1746#
1747#   make foo/bar/baz.s
1748#
1749# The supported suffixes for single-target are listed in 'single-targets'
1750#
1751# To build only under specific subdirectories, you can do like this:
1752#
1753#   make foo/bar/baz/
1754
1755ifdef single-build
1756
1757# .ko is special because modpost is needed
1758single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1759single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1760
1761$(single-ko): single_modpost
1762	@:
1763$(single-no-ko): descend
1764	@:
1765
1766ifeq ($(KBUILD_EXTMOD),)
1767# For the single build of in-tree modules, use a temporary file to avoid
1768# the situation of modules_install installing an invalid modules.order.
1769MODORDER := .modules.tmp
1770endif
1771
1772PHONY += single_modpost
1773single_modpost: $(single-no-ko) modules_prepare
1774	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1775	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1776
1777KBUILD_MODULES := 1
1778
1779export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1780
1781# trim unrelated directories
1782build-dirs := $(foreach d, $(build-dirs), \
1783			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1784
1785endif
1786
1787ifndef CONFIG_MODULES
1788KBUILD_MODULES :=
1789endif
1790
1791# Handle descending into subdirectories listed in $(build-dirs)
1792# Preset locale variables to speed up the build process. Limit locale
1793# tweaks to this spot to avoid wrong language settings when running
1794# make menuconfig etc.
1795# Error messages still appears in the original language
1796PHONY += descend $(build-dirs)
1797descend: $(build-dirs)
1798$(build-dirs): prepare
1799	$(Q)$(MAKE) $(build)=$@ \
1800	single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1801	need-builtin=1 need-modorder=1
1802
1803clean-dirs := $(addprefix _clean_, $(clean-dirs))
1804PHONY += $(clean-dirs) clean
1805$(clean-dirs):
1806	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1807
1808clean: $(clean-dirs)
1809	$(call cmd,rmfiles)
1810	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1811		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1812		-o -name '*.ko.*' \
1813		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1814		-o -name '*.dwo' -o -name '*.lst' \
1815		-o -name '*.su' -o -name '*.mod' \
1816		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1817		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1818		-o -name '*.asn1.[ch]' \
1819		-o -name '*.symtypes' -o -name 'modules.order' \
1820		-o -name '.tmp_*.o.*' \
1821		-o -name '*.c.[012]*.*' \
1822		-o -name '*.ll' \
1823		-o -name '*.gcno' \) -type f -print | xargs rm -f
1824
1825# Generate tags for editors
1826# ---------------------------------------------------------------------------
1827quiet_cmd_tags = GEN     $@
1828      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1829
1830tags TAGS cscope gtags: FORCE
1831	$(call cmd,tags)
1832
1833# Script to generate missing namespace dependencies
1834# ---------------------------------------------------------------------------
1835
1836PHONY += nsdeps
1837nsdeps: export KBUILD_NSDEPS=1
1838nsdeps: modules
1839	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1840
1841# Clang Tooling
1842# ---------------------------------------------------------------------------
1843
1844quiet_cmd_gen_compile_commands = GEN     $@
1845      cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1846
1847$(extmod-prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1848	$(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1849	$(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1850	$(call if_changed,gen_compile_commands)
1851
1852targets += $(extmod-prefix)compile_commands.json
1853
1854PHONY += clang-tidy clang-analyzer
1855
1856ifdef CONFIG_CC_IS_CLANG
1857quiet_cmd_clang_tools = CHECK   $<
1858      cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1859
1860clang-tidy clang-analyzer: $(extmod-prefix)compile_commands.json
1861	$(call cmd,clang_tools)
1862else
1863clang-tidy clang-analyzer:
1864	@echo "$@ requires CC=clang" >&2
1865	@false
1866endif
1867
1868# Scripts to check various things for consistency
1869# ---------------------------------------------------------------------------
1870
1871PHONY += includecheck versioncheck coccicheck export_report
1872
1873includecheck:
1874	find $(srctree)/* $(RCS_FIND_IGNORE) \
1875		-name '*.[hcS]' -type f -print | sort \
1876		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1877
1878versioncheck:
1879	find $(srctree)/* $(RCS_FIND_IGNORE) \
1880		-name '*.[hcS]' -type f -print | sort \
1881		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1882
1883coccicheck:
1884	$(Q)$(BASH) $(srctree)/scripts/$@
1885
1886export_report:
1887	$(PERL) $(srctree)/scripts/export_report.pl
1888
1889PHONY += checkstack kernelrelease kernelversion image_name
1890
1891# UML needs a little special treatment here.  It wants to use the host
1892# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1893# else wants $(ARCH), including people doing cross-builds, which means
1894# that $(SUBARCH) doesn't work here.
1895ifeq ($(ARCH), um)
1896CHECKSTACK_ARCH := $(SUBARCH)
1897else
1898CHECKSTACK_ARCH := $(ARCH)
1899endif
1900checkstack:
1901	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1902	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1903
1904kernelrelease:
1905	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1906
1907kernelversion:
1908	@echo $(KERNELVERSION)
1909
1910image_name:
1911	@echo $(KBUILD_IMAGE)
1912
1913# Clear a bunch of variables before executing the submake
1914
1915ifeq ($(quiet),silent_)
1916tools_silent=s
1917endif
1918
1919tools/: FORCE
1920	$(Q)mkdir -p $(objtree)/tools
1921	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1922
1923tools/%: FORCE
1924	$(Q)mkdir -p $(objtree)/tools
1925	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1926
1927quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1928      cmd_rmfiles = rm -rf $(rm-files)
1929
1930# Run depmod only if we have System.map and depmod is executable
1931quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1932      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1933                   $(KERNELRELEASE)
1934
1935# read saved command lines for existing targets
1936existing-targets := $(wildcard $(sort $(targets)))
1937
1938-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1939
1940endif # config-build
1941endif # mixed-build
1942endif # need-sub-make
1943
1944PHONY += FORCE
1945FORCE:
1946
1947# Declare the contents of the PHONY variable as phony.  We keep that
1948# information in a variable so we can use it in if_changed and friends.
1949.PHONY: $(PHONY)
1950