Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 14
4SUBLEVEL = 0
5EXTRAVERSION = -rc2
6NAME = Opossums on Parade
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),$(abs_objtree))
192# Look for make include files relative to root of kernel src
193#
194# This does not become effective immediately because MAKEFLAGS is re-parsed
195# once after the Makefile is read. We need to invoke sub-make.
196MAKEFLAGS += --include-dir=$(abs_srctree)
197need-sub-make := 1
198endif
199
200ifneq ($(filter 3.%,$(MAKE_VERSION)),)
201# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
202# We need to invoke sub-make to avoid implicit rules in the top Makefile.
203need-sub-make := 1
204# Cancel implicit rules for this Makefile.
205$(this-makefile): ;
206endif
207
208export abs_srctree abs_objtree
209export sub_make_done := 1
210
211ifeq ($(need-sub-make),1)
212
213PHONY += $(MAKECMDGOALS) __sub-make
214
215$(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
216 @:
217
218# Invoke a second make in the output directory, passing relevant variables
219__sub-make:
220 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
221
222endif # need-sub-make
223endif # sub_make_done
224
225# We process the rest of the Makefile if this is the final invocation of make
226ifeq ($(need-sub-make),)
227
228# Do not print "Entering directory ...",
229# but we want to display it when entering to the output directory
230# so that IDEs/editors are able to understand relative filenames.
231MAKEFLAGS += --no-print-directory
232
233ifeq ($(abs_srctree),$(abs_objtree))
234 # building in the source tree
235 srctree := .
236 building_out_of_srctree :=
237else
238 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
239 # building in a subdirectory of the source tree
240 srctree := ..
241 else
242 srctree := $(abs_srctree)
243 endif
244 building_out_of_srctree := 1
245endif
246
247ifneq ($(KBUILD_ABS_SRCTREE),)
248srctree := $(abs_srctree)
249endif
250
251objtree := .
252VPATH := $(srctree)
253
254export building_out_of_srctree srctree objtree VPATH
255
256# To make sure we do not include .config for any of the *config targets
257# catch them early, and hand them over to scripts/kconfig/Makefile
258# It is allowed to specify more targets when calling make, including
259# mixing *config targets and build targets.
260# For example 'make oldconfig all'.
261# Detect when mixed targets is specified, and make a second invocation
262# of make so .config is not included in this case either (for *config).
263
264version_h := include/generated/uapi/linux/version.h
265
266clean-targets := %clean mrproper cleandocs
267no-dot-config-targets := $(clean-targets) \
268 cscope gtags TAGS tags help% %docs check% coccicheck \
269 $(version_h) headers headers_% archheaders archscripts \
270 %asm-generic kernelversion %src-pkg dt_binding_check \
271 outputmakefile
272# Installation targets should not require compiler. Unfortunately, vdso_install
273# is an exception where build artifacts may be updated. This must be fixed.
274no-compiler-targets := $(no-dot-config-targets) install dtbs_install \
275 headers_install modules_install kernelrelease image_name
276no-sync-config-targets := $(no-dot-config-targets) %install kernelrelease \
277 image_name
278single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
279
280config-build :=
281mixed-build :=
282need-config := 1
283need-compiler := 1
284may-sync-config := 1
285single-build :=
286
287ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config :=
290 endif
291endif
292
293ifneq ($(filter $(no-compiler-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-compiler-targets), $(MAKECMDGOALS)),)
295 need-compiler :=
296 endif
297endif
298
299ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
300 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
301 may-sync-config :=
302 endif
303endif
304
305ifneq ($(KBUILD_EXTMOD),)
306 may-sync-config :=
307endif
308
309ifeq ($(KBUILD_EXTMOD),)
310 ifneq ($(filter %config,$(MAKECMDGOALS)),)
311 config-build := 1
312 ifneq ($(words $(MAKECMDGOALS)),1)
313 mixed-build := 1
314 endif
315 endif
316endif
317
318# We cannot build single targets and the others at the same time
319ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
320 single-build := 1
321 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
322 mixed-build := 1
323 endif
324endif
325
326# For "make -j clean all", "make -j mrproper defconfig all", etc.
327ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
328 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
329 mixed-build := 1
330 endif
331endif
332
333# install and modules_install need also be processed one by one
334ifneq ($(filter install,$(MAKECMDGOALS)),)
335 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
336 mixed-build := 1
337 endif
338endif
339
340ifdef mixed-build
341# ===========================================================================
342# We're called with mixed targets (*config and build targets).
343# Handle them one by one.
344
345PHONY += $(MAKECMDGOALS) __build_one_by_one
346
347$(MAKECMDGOALS): __build_one_by_one
348 @:
349
350__build_one_by_one:
351 $(Q)set -e; \
352 for i in $(MAKECMDGOALS); do \
353 $(MAKE) -f $(srctree)/Makefile $$i; \
354 done
355
356else # !mixed-build
357
358include $(srctree)/scripts/Kbuild.include
359
360# Read KERNELRELEASE from include/config/kernel.release (if it exists)
361KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
362KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
363export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
364
365include $(srctree)/scripts/subarch.include
366
367# Cross compiling and selecting different set of gcc/bin-utils
368# ---------------------------------------------------------------------------
369#
370# When performing cross compilation for other architectures ARCH shall be set
371# to the target architecture. (See arch/* for the possibilities).
372# ARCH can be set during invocation of make:
373# make ARCH=ia64
374# Another way is to have ARCH set in the environment.
375# The default ARCH is the host where make is executed.
376
377# CROSS_COMPILE specify the prefix used for all executables used
378# during compilation. Only gcc and related bin-utils executables
379# are prefixed with $(CROSS_COMPILE).
380# CROSS_COMPILE can be set on the command line
381# make CROSS_COMPILE=ia64-linux-
382# Alternatively CROSS_COMPILE can be set in the environment.
383# Default value for CROSS_COMPILE is not to prefix executables
384# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
385ARCH ?= $(SUBARCH)
386
387# Architecture as present in compile.h
388UTS_MACHINE := $(ARCH)
389SRCARCH := $(ARCH)
390
391# Additional ARCH settings for x86
392ifeq ($(ARCH),i386)
393 SRCARCH := x86
394endif
395ifeq ($(ARCH),x86_64)
396 SRCARCH := x86
397endif
398
399# Additional ARCH settings for sparc
400ifeq ($(ARCH),sparc32)
401 SRCARCH := sparc
402endif
403ifeq ($(ARCH),sparc64)
404 SRCARCH := sparc
405endif
406
407export cross_compiling :=
408ifneq ($(SRCARCH),$(SUBARCH))
409cross_compiling := 1
410endif
411
412KCONFIG_CONFIG ?= .config
413export KCONFIG_CONFIG
414
415# SHELL used by kbuild
416CONFIG_SHELL := sh
417
418HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
419HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
420HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
421
422ifneq ($(LLVM),)
423HOSTCC = clang
424HOSTCXX = clang++
425else
426HOSTCC = gcc
427HOSTCXX = g++
428endif
429
430export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
431 -O2 -fomit-frame-pointer -std=gnu89
432export KBUILD_USERLDFLAGS :=
433
434KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
435KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
436KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
437KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
438
439# Make variables (CC, etc...)
440CPP = $(CC) -E
441ifneq ($(LLVM),)
442CC = clang
443LD = ld.lld
444AR = llvm-ar
445NM = llvm-nm
446OBJCOPY = llvm-objcopy
447OBJDUMP = llvm-objdump
448READELF = llvm-readelf
449STRIP = llvm-strip
450else
451CC = $(CROSS_COMPILE)gcc
452LD = $(CROSS_COMPILE)ld
453AR = $(CROSS_COMPILE)ar
454NM = $(CROSS_COMPILE)nm
455OBJCOPY = $(CROSS_COMPILE)objcopy
456OBJDUMP = $(CROSS_COMPILE)objdump
457READELF = $(CROSS_COMPILE)readelf
458STRIP = $(CROSS_COMPILE)strip
459endif
460PAHOLE = pahole
461RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
462LEX = flex
463YACC = bison
464AWK = awk
465INSTALLKERNEL := installkernel
466DEPMOD = depmod
467PERL = perl
468PYTHON3 = python3
469CHECK = sparse
470BASH = bash
471KGZIP = gzip
472KBZIP2 = bzip2
473KLZOP = lzop
474LZMA = lzma
475LZ4 = lz4c
476XZ = xz
477ZSTD = zstd
478
479CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
480 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
481NOSTDINC_FLAGS :=
482CFLAGS_MODULE =
483AFLAGS_MODULE =
484LDFLAGS_MODULE =
485CFLAGS_KERNEL =
486AFLAGS_KERNEL =
487LDFLAGS_vmlinux =
488
489# Use USERINCLUDE when you must reference the UAPI directories only.
490USERINCLUDE := \
491 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
492 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
493 -I$(srctree)/include/uapi \
494 -I$(objtree)/include/generated/uapi \
495 -include $(srctree)/include/linux/compiler-version.h \
496 -include $(srctree)/include/linux/kconfig.h
497
498# Use LINUXINCLUDE when you must reference the include/ directory.
499# Needed to be compatible with the O= option
500LINUXINCLUDE := \
501 -I$(srctree)/arch/$(SRCARCH)/include \
502 -I$(objtree)/arch/$(SRCARCH)/include/generated \
503 $(if $(building_out_of_srctree),-I$(srctree)/include) \
504 -I$(objtree)/include \
505 $(USERINCLUDE)
506
507KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
508KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
509 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
510 -Werror=implicit-function-declaration -Werror=implicit-int \
511 -Werror=return-type -Wno-format-security \
512 -std=gnu89
513KBUILD_CPPFLAGS := -D__KERNEL__
514KBUILD_AFLAGS_KERNEL :=
515KBUILD_CFLAGS_KERNEL :=
516KBUILD_AFLAGS_MODULE := -DMODULE
517KBUILD_CFLAGS_MODULE := -DMODULE
518KBUILD_LDFLAGS_MODULE :=
519KBUILD_LDFLAGS :=
520CLANG_FLAGS :=
521
522export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
523export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
524export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
525export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
526export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
527
528export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
529export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
530export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
531export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
532export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
533
534# Files to ignore in find ... statements
535
536export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
537 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
538 -prune -o
539export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
540 --exclude CVS --exclude .pc --exclude .hg --exclude .git
541
542# ===========================================================================
543# Rules shared between *config targets and build targets
544
545# Basic helpers built in scripts/basic/
546PHONY += scripts_basic
547scripts_basic:
548 $(Q)$(MAKE) $(build)=scripts/basic
549 $(Q)rm -f .tmp_quiet_recordmcount
550
551PHONY += outputmakefile
552ifdef building_out_of_srctree
553# Before starting out-of-tree build, make sure the source tree is clean.
554# outputmakefile generates a Makefile in the output directory, if using a
555# separate output directory. This allows convenient use of make in the
556# output directory.
557# At the same time when output Makefile generated, generate .gitignore to
558# ignore whole output directory
559
560quiet_cmd_makefile = GEN Makefile
561 cmd_makefile = { \
562 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
563 echo "include $(srctree)/Makefile"; \
564 } > Makefile
565
566outputmakefile:
567 $(Q)if [ -f $(srctree)/.config -o \
568 -d $(srctree)/include/config -o \
569 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
570 echo >&2 "***"; \
571 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
572 echo >&2 "*** in $(abs_srctree)";\
573 echo >&2 "***"; \
574 false; \
575 fi
576 $(Q)ln -fsn $(srctree) source
577 $(call cmd,makefile)
578 $(Q)test -e .gitignore || \
579 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
580endif
581
582# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
583# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
584# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
585# and from include/config/auto.conf.cmd to detect the compiler upgrade.
586CC_VERSION_TEXT = $(subst $(pound),,$(shell $(CC) --version 2>/dev/null | head -n 1))
587
588ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
589ifneq ($(CROSS_COMPILE),)
590CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
591endif
592ifeq ($(LLVM_IAS),1)
593CLANG_FLAGS += -integrated-as
594else
595CLANG_FLAGS += -no-integrated-as
596GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
597CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)$(notdir $(CROSS_COMPILE))
598endif
599CLANG_FLAGS += -Werror=unknown-warning-option
600KBUILD_CFLAGS += $(CLANG_FLAGS)
601KBUILD_AFLAGS += $(CLANG_FLAGS)
602export CLANG_FLAGS
603endif
604
605# Include this also for config targets because some architectures need
606# cc-cross-prefix to determine CROSS_COMPILE.
607ifdef need-compiler
608include $(srctree)/scripts/Makefile.compiler
609endif
610
611ifdef config-build
612# ===========================================================================
613# *config targets only - make sure prerequisites are updated, and descend
614# in scripts/kconfig to make the *config target
615
616# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
617# KBUILD_DEFCONFIG may point out an alternative default configuration
618# used for 'make defconfig'
619include $(srctree)/arch/$(SRCARCH)/Makefile
620export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
621
622config: outputmakefile scripts_basic FORCE
623 $(Q)$(MAKE) $(build)=scripts/kconfig $@
624
625%config: outputmakefile scripts_basic FORCE
626 $(Q)$(MAKE) $(build)=scripts/kconfig $@
627
628else #!config-build
629# ===========================================================================
630# Build targets only - this includes vmlinux, arch specific targets, clean
631# targets and others. In general all targets except *config targets.
632
633# If building an external module we do not care about the all: rule
634# but instead __all depend on modules
635PHONY += all
636ifeq ($(KBUILD_EXTMOD),)
637__all: all
638else
639__all: modules
640endif
641
642# Decide whether to build built-in, modular, or both.
643# Normally, just do built-in.
644
645KBUILD_MODULES :=
646KBUILD_BUILTIN := 1
647
648# If we have only "make modules", don't compile built-in objects.
649ifeq ($(MAKECMDGOALS),modules)
650 KBUILD_BUILTIN :=
651endif
652
653# If we have "make <whatever> modules", compile modules
654# in addition to whatever we do anyway.
655# Just "make" or "make all" shall build modules as well
656
657ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
658 KBUILD_MODULES := 1
659endif
660
661ifeq ($(MAKECMDGOALS),)
662 KBUILD_MODULES := 1
663endif
664
665export KBUILD_MODULES KBUILD_BUILTIN
666
667ifdef need-config
668include include/config/auto.conf
669endif
670
671ifeq ($(KBUILD_EXTMOD),)
672# Objects we will link into vmlinux / subdirs we need to visit
673core-y := init/ usr/ arch/$(SRCARCH)/
674drivers-y := drivers/ sound/
675drivers-$(CONFIG_SAMPLES) += samples/
676drivers-$(CONFIG_NET) += net/
677drivers-y += virt/
678libs-y := lib/
679endif # KBUILD_EXTMOD
680
681# The all: target is the default when no target is given on the
682# command line.
683# This allow a user to issue only 'make' to build a kernel including modules
684# Defaults to vmlinux, but the arch makefile usually adds further targets
685all: vmlinux
686
687CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
688 $(call cc-option,-fno-tree-loop-im) \
689 $(call cc-disable-warning,maybe-uninitialized,)
690export CFLAGS_GCOV
691
692# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
693ifdef CONFIG_FUNCTION_TRACER
694 CC_FLAGS_FTRACE := -pg
695endif
696
697RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
698RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
699RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
700RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
701RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
702RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
703export RETPOLINE_CFLAGS
704export RETPOLINE_VDSO_CFLAGS
705
706include $(srctree)/arch/$(SRCARCH)/Makefile
707
708ifdef need-config
709ifdef may-sync-config
710# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
711# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
712# because some architectures define CROSS_COMPILE there.
713include include/config/auto.conf.cmd
714
715$(KCONFIG_CONFIG):
716 @echo >&2 '***'
717 @echo >&2 '*** Configuration file "$@" not found!'
718 @echo >&2 '***'
719 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
720 @echo >&2 '*** "make menuconfig" or "make xconfig").'
721 @echo >&2 '***'
722 @/bin/false
723
724# The actual configuration files used during the build are stored in
725# include/generated/ and include/config/. Update them if .config is newer than
726# include/config/auto.conf (which mirrors .config).
727#
728# This exploits the 'multi-target pattern rule' trick.
729# The syncconfig should be executed only once to make all the targets.
730# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
731#
732# Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
733# so you cannot notice that Kconfig is waiting for the user input.
734%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
735 $(Q)$(kecho) " SYNC $@"
736 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
737else # !may-sync-config
738# External modules and some install targets need include/generated/autoconf.h
739# and include/config/auto.conf but do not care if they are up-to-date.
740# Use auto.conf to trigger the test
741PHONY += include/config/auto.conf
742
743include/config/auto.conf:
744 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
745 echo >&2; \
746 echo >&2 " ERROR: Kernel configuration is invalid."; \
747 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
748 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
749 echo >&2 ; \
750 /bin/false)
751
752endif # may-sync-config
753endif # need-config
754
755KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
756KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
757KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
758KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
759KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
760
761ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
762KBUILD_CFLAGS += -O2
763else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
764KBUILD_CFLAGS += -O3
765else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
766KBUILD_CFLAGS += -Os
767endif
768
769# Tell gcc to never replace conditional load with a non-conditional one
770KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
771KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
772
773ifdef CONFIG_READABLE_ASM
774# Disable optimizations that make assembler listings hard to read.
775# reorder blocks reorders the control in the function
776# ipa clone creates specialized cloned functions
777# partial inlining inlines only parts of functions
778KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
779 $(call cc-option,-fno-ipa-cp-clone,) \
780 $(call cc-option,-fno-partial-inlining)
781endif
782
783ifneq ($(CONFIG_FRAME_WARN),0)
784KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
785endif
786
787stackp-flags-y := -fno-stack-protector
788stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
789stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
790
791KBUILD_CFLAGS += $(stackp-flags-y)
792
793ifdef CONFIG_CC_IS_CLANG
794KBUILD_CPPFLAGS += -Qunused-arguments
795KBUILD_CFLAGS += -Wno-format-invalid-specifier
796KBUILD_CFLAGS += -Wno-gnu
797# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
798# source of a reference will be _MergedGlobals and not on of the whitelisted names.
799# See modpost pattern 2
800KBUILD_CFLAGS += -mno-global-merge
801else
802
803# Warn about unmarked fall-throughs in switch statement.
804# Disabled for clang while comment to attribute conversion happens and
805# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
806KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough=5,)
807endif
808
809# These warnings generated too much noise in a regular build.
810# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
811KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
812
813KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
814ifdef CONFIG_FRAME_POINTER
815KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
816else
817# Some targets (ARM with Thumb2, for example), can't be built with frame
818# pointers. For those, we don't have FUNCTION_TRACER automatically
819# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
820# incompatible with -fomit-frame-pointer with current GCC, so we don't use
821# -fomit-frame-pointer with FUNCTION_TRACER.
822ifndef CONFIG_FUNCTION_TRACER
823KBUILD_CFLAGS += -fomit-frame-pointer
824endif
825endif
826
827# Initialize all stack variables with a 0xAA pattern.
828ifdef CONFIG_INIT_STACK_ALL_PATTERN
829KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
830endif
831
832# Initialize all stack variables with a zero value.
833ifdef CONFIG_INIT_STACK_ALL_ZERO
834# Future support for zero initialization is still being debated, see
835# https://bugs.llvm.org/show_bug.cgi?id=45497. These flags are subject to being
836# renamed or dropped.
837KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
838KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
839endif
840
841# While VLAs have been removed, GCC produces unreachable stack probes
842# for the randomize_kstack_offset feature. Disable it for all compilers.
843KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
844
845DEBUG_CFLAGS :=
846
847# Workaround for GCC versions < 5.0
848# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61801
849ifdef CONFIG_CC_IS_GCC
850DEBUG_CFLAGS += $(call cc-ifversion, -lt, 0500, $(call cc-option, -fno-var-tracking-assignments))
851endif
852
853ifdef CONFIG_DEBUG_INFO
854
855ifdef CONFIG_DEBUG_INFO_SPLIT
856DEBUG_CFLAGS += -gsplit-dwarf
857else
858DEBUG_CFLAGS += -g
859endif
860
861ifneq ($(LLVM_IAS),1)
862KBUILD_AFLAGS += -Wa,-gdwarf-2
863endif
864
865ifndef CONFIG_DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
866dwarf-version-$(CONFIG_DEBUG_INFO_DWARF4) := 4
867dwarf-version-$(CONFIG_DEBUG_INFO_DWARF5) := 5
868DEBUG_CFLAGS += -gdwarf-$(dwarf-version-y)
869endif
870
871ifdef CONFIG_DEBUG_INFO_REDUCED
872DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
873 $(call cc-option,-fno-var-tracking)
874endif
875
876ifdef CONFIG_DEBUG_INFO_COMPRESSED
877DEBUG_CFLAGS += -gz=zlib
878KBUILD_AFLAGS += -gz=zlib
879KBUILD_LDFLAGS += --compress-debug-sections=zlib
880endif
881
882endif # CONFIG_DEBUG_INFO
883
884KBUILD_CFLAGS += $(DEBUG_CFLAGS)
885export DEBUG_CFLAGS
886
887ifdef CONFIG_FUNCTION_TRACER
888ifdef CONFIG_FTRACE_MCOUNT_USE_CC
889 CC_FLAGS_FTRACE += -mrecord-mcount
890 ifdef CONFIG_HAVE_NOP_MCOUNT
891 ifeq ($(call cc-option-yn, -mnop-mcount),y)
892 CC_FLAGS_FTRACE += -mnop-mcount
893 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
894 endif
895 endif
896endif
897ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
898 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
899endif
900ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
901 ifdef CONFIG_HAVE_C_RECORDMCOUNT
902 BUILD_C_RECORDMCOUNT := y
903 export BUILD_C_RECORDMCOUNT
904 endif
905endif
906ifdef CONFIG_HAVE_FENTRY
907 ifeq ($(call cc-option-yn, -mfentry),y)
908 CC_FLAGS_FTRACE += -mfentry
909 CC_FLAGS_USING += -DCC_USING_FENTRY
910 endif
911endif
912export CC_FLAGS_FTRACE
913KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
914KBUILD_AFLAGS += $(CC_FLAGS_USING)
915endif
916
917# We trigger additional mismatches with less inlining
918ifdef CONFIG_DEBUG_SECTION_MISMATCH
919KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
920endif
921
922ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
923KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
924LDFLAGS_vmlinux += --gc-sections
925endif
926
927ifdef CONFIG_SHADOW_CALL_STACK
928CC_FLAGS_SCS := -fsanitize=shadow-call-stack
929KBUILD_CFLAGS += $(CC_FLAGS_SCS)
930export CC_FLAGS_SCS
931endif
932
933ifdef CONFIG_LTO_CLANG
934ifdef CONFIG_LTO_CLANG_THIN
935CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
936KBUILD_LDFLAGS += --thinlto-cache-dir=$(extmod_prefix).thinlto-cache
937else
938CC_FLAGS_LTO := -flto
939endif
940CC_FLAGS_LTO += -fvisibility=hidden
941
942# Limit inlining across translation units to reduce binary size
943KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
944
945# Check for frame size exceeding threshold during prolog/epilog insertion
946# when using lld < 13.0.0.
947ifneq ($(CONFIG_FRAME_WARN),0)
948ifeq ($(shell test $(CONFIG_LLD_VERSION) -lt 130000; echo $$?),0)
949KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
950endif
951endif
952endif
953
954ifdef CONFIG_LTO
955KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
956KBUILD_AFLAGS += -fno-lto
957export CC_FLAGS_LTO
958endif
959
960ifdef CONFIG_CFI_CLANG
961CC_FLAGS_CFI := -fsanitize=cfi \
962 -fsanitize-cfi-cross-dso \
963 -fno-sanitize-cfi-canonical-jump-tables \
964 -fno-sanitize-trap=cfi \
965 -fno-sanitize-blacklist
966
967ifdef CONFIG_CFI_PERMISSIVE
968CC_FLAGS_CFI += -fsanitize-recover=cfi
969endif
970
971# If LTO flags are filtered out, we must also filter out CFI.
972CC_FLAGS_LTO += $(CC_FLAGS_CFI)
973KBUILD_CFLAGS += $(CC_FLAGS_CFI)
974export CC_FLAGS_CFI
975endif
976
977ifdef CONFIG_DEBUG_FORCE_FUNCTION_ALIGN_64B
978KBUILD_CFLAGS += -falign-functions=64
979endif
980
981# arch Makefile may override CC so keep this after arch Makefile is included
982NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
983
984# warn about C99 declaration after statement
985KBUILD_CFLAGS += -Wdeclaration-after-statement
986
987# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
988KBUILD_CFLAGS += -Wvla
989
990# disable pointer signed / unsigned warnings in gcc 4.0
991KBUILD_CFLAGS += -Wno-pointer-sign
992
993# disable stringop warnings in gcc 8+
994KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
995
996# We'll want to enable this eventually, but it's not going away for 5.7 at least
997KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
998KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
999KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
1000
1001# Another good warning that we'll want to enable eventually
1002KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
1003
1004# Enabled with W=2, disabled by default as noisy
1005KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
1006
1007# disable invalid "can't wrap" optimizations for signed / pointers
1008KBUILD_CFLAGS += -fno-strict-overflow
1009
1010# Make sure -fstack-check isn't enabled (like gentoo apparently did)
1011KBUILD_CFLAGS += -fno-stack-check
1012
1013# conserve stack if available
1014KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
1015
1016# Prohibit date/time macros, which would make the build non-deterministic
1017KBUILD_CFLAGS += -Werror=date-time
1018
1019# enforce correct pointer usage
1020KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
1021
1022# Require designated initializers for all marked structures
1023KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
1024
1025# change __FILE__ to the relative path from the srctree
1026KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1027
1028# include additional Makefiles when needed
1029include-y := scripts/Makefile.extrawarn
1030include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1031include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1032include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1033include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1034include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1035
1036include $(addprefix $(srctree)/, $(include-y))
1037
1038# scripts/Makefile.gcc-plugins is intentionally included last.
1039# Do not add $(call cc-option,...) below this line. When you build the kernel
1040# from the clean source tree, the GCC plugins do not exist at this point.
1041
1042# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
1043KBUILD_CPPFLAGS += $(KCPPFLAGS)
1044KBUILD_AFLAGS += $(KAFLAGS)
1045KBUILD_CFLAGS += $(KCFLAGS)
1046
1047KBUILD_LDFLAGS_MODULE += --build-id=sha1
1048LDFLAGS_vmlinux += --build-id=sha1
1049
1050ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1051LDFLAGS_vmlinux += $(call ld-option, -X,)
1052endif
1053
1054ifeq ($(CONFIG_RELR),y)
1055LDFLAGS_vmlinux += --pack-dyn-relocs=relr --use-android-relr-tags
1056endif
1057
1058# We never want expected sections to be placed heuristically by the
1059# linker. All sections should be explicitly named in the linker script.
1060ifdef CONFIG_LD_ORPHAN_WARN
1061LDFLAGS_vmlinux += --orphan-handling=warn
1062endif
1063
1064# Align the bit size of userspace programs with the kernel
1065KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1066KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1067
1068# make the checker run with the right architecture
1069CHECKFLAGS += --arch=$(ARCH)
1070
1071# insure the checker run with the right endianness
1072CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1073
1074# the checker needs the correct machine size
1075CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1076
1077# Default kernel image to build when no specific target is given.
1078# KBUILD_IMAGE may be overruled on the command line or
1079# set in the environment
1080# Also any assignments in arch/$(ARCH)/Makefile take precedence over
1081# this default value
1082export KBUILD_IMAGE ?= vmlinux
1083
1084#
1085# INSTALL_PATH specifies where to place the updated kernel and system map
1086# images. Default is /boot, but you can set it to other values
1087export INSTALL_PATH ?= /boot
1088
1089#
1090# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1091# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1092# an argument if needed. Otherwise it defaults to the kernel install path
1093#
1094export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1095
1096#
1097# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1098# relocations required by build roots. This is not defined in the
1099# makefile but the argument can be passed to make if needed.
1100#
1101
1102MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1103export MODLIB
1104
1105PHONY += prepare0
1106
1107export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1108export MODORDER := $(extmod_prefix)modules.order
1109export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1110
1111ifeq ($(KBUILD_EXTMOD),)
1112core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1113
1114vmlinux-dirs := $(patsubst %/,%,$(filter %/, \
1115 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1116 $(libs-y) $(libs-m)))
1117
1118vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1119 $(patsubst %/,%,$(filter %/, $(core-) \
1120 $(drivers-) $(libs-))))
1121
1122subdir-modorder := $(addsuffix modules.order,$(filter %/, \
1123 $(core-y) $(core-m) $(libs-y) $(libs-m) \
1124 $(drivers-y) $(drivers-m)))
1125
1126build-dirs := $(vmlinux-dirs)
1127clean-dirs := $(vmlinux-alldirs)
1128
1129# Externally visible symbols (used by link-vmlinux.sh)
1130KBUILD_VMLINUX_OBJS := $(head-y) $(patsubst %/,%/built-in.a, $(core-y))
1131KBUILD_VMLINUX_OBJS += $(addsuffix built-in.a, $(filter %/, $(libs-y)))
1132ifdef CONFIG_MODULES
1133KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1134KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1135else
1136KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1137endif
1138KBUILD_VMLINUX_OBJS += $(patsubst %/,%/built-in.a, $(drivers-y))
1139
1140export KBUILD_VMLINUX_OBJS KBUILD_VMLINUX_LIBS
1141export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1142# used by scripts/Makefile.package
1143export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1144
1145vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1146
1147# Recurse until adjust_autoksyms.sh is satisfied
1148PHONY += autoksyms_recursive
1149ifdef CONFIG_TRIM_UNUSED_KSYMS
1150# For the kernel to actually contain only the needed exported symbols,
1151# we have to build modules as well to determine what those symbols are.
1152# (this can be evaluated only once include/config/auto.conf has been included)
1153KBUILD_MODULES := 1
1154
1155autoksyms_recursive: descend modules.order
1156 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1157 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1158endif
1159
1160autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1161
1162quiet_cmd_autoksyms_h = GEN $@
1163 cmd_autoksyms_h = mkdir -p $(dir $@); \
1164 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1165
1166$(autoksyms_h):
1167 $(call cmd,autoksyms_h)
1168
1169ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1170
1171# Final link of vmlinux with optional arch pass after final link
1172cmd_link-vmlinux = \
1173 $(CONFIG_SHELL) $< "$(LD)" "$(KBUILD_LDFLAGS)" "$(LDFLAGS_vmlinux)"; \
1174 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1175
1176vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1177 +$(call if_changed_dep,link-vmlinux)
1178
1179targets := vmlinux
1180
1181# The actual objects are generated when descending,
1182# make sure no implicit rule kicks in
1183$(sort $(vmlinux-deps) $(subdir-modorder)): descend ;
1184
1185filechk_kernel.release = \
1186 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1187
1188# Store (new) KERNELRELEASE string in include/config/kernel.release
1189include/config/kernel.release: FORCE
1190 $(call filechk,kernel.release)
1191
1192# Additional helpers built in scripts/
1193# Carefully list dependencies so we do not try to build scripts twice
1194# in parallel
1195PHONY += scripts
1196scripts: scripts_basic scripts_dtc
1197 $(Q)$(MAKE) $(build)=$(@)
1198
1199# Things we need to do before we recursively start building the kernel
1200# or the modules are listed in "prepare".
1201# A multi level approach is used. prepareN is processed before prepareN-1.
1202# archprepare is used in arch Makefiles and when processed asm symlink,
1203# version.h and scripts_basic is processed / created.
1204
1205PHONY += prepare archprepare
1206
1207archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1208 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1209 include/generated/autoconf.h remove-stale-files
1210
1211prepare0: archprepare
1212 $(Q)$(MAKE) $(build)=scripts/mod
1213 $(Q)$(MAKE) $(build)=.
1214
1215# All the preparing..
1216prepare: prepare0
1217
1218PHONY += remove-stale-files
1219remove-stale-files:
1220 $(Q)$(srctree)/scripts/remove-stale-files
1221
1222# Support for using generic headers in asm-generic
1223asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1224
1225PHONY += asm-generic uapi-asm-generic
1226asm-generic: uapi-asm-generic
1227 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1228 generic=include/asm-generic
1229uapi-asm-generic:
1230 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1231 generic=include/uapi/asm-generic
1232
1233# Generate some files
1234# ---------------------------------------------------------------------------
1235
1236# KERNELRELEASE can change from a few different places, meaning version.h
1237# needs to be updated, so this check is forced on all builds
1238
1239uts_len := 64
1240define filechk_utsrelease.h
1241 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1242 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1243 exit 1; \
1244 fi; \
1245 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1246endef
1247
1248define filechk_version.h
1249 if [ $(SUBLEVEL) -gt 255 ]; then \
1250 echo \#define LINUX_VERSION_CODE $(shell \
1251 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1252 else \
1253 echo \#define LINUX_VERSION_CODE $(shell \
1254 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1255 fi; \
1256 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1257 ((c) > 255 ? 255 : (c)))'; \
1258 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1259 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1260 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1261endef
1262
1263$(version_h): PATCHLEVEL := $(if $(PATCHLEVEL), $(PATCHLEVEL), 0)
1264$(version_h): SUBLEVEL := $(if $(SUBLEVEL), $(SUBLEVEL), 0)
1265$(version_h): FORCE
1266 $(call filechk,version.h)
1267
1268include/generated/utsrelease.h: include/config/kernel.release FORCE
1269 $(call filechk,utsrelease.h)
1270
1271PHONY += headerdep
1272headerdep:
1273 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1274 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1275
1276# ---------------------------------------------------------------------------
1277# Kernel headers
1278
1279#Default location for installed headers
1280export INSTALL_HDR_PATH = $(objtree)/usr
1281
1282quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1283 cmd_headers_install = \
1284 mkdir -p $(INSTALL_HDR_PATH); \
1285 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1286 usr/include $(INSTALL_HDR_PATH)
1287
1288PHONY += headers_install
1289headers_install: headers
1290 $(call cmd,headers_install)
1291
1292PHONY += archheaders archscripts
1293
1294hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1295
1296PHONY += headers
1297headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1298 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1299 $(error Headers not exportable for the $(SRCARCH) architecture))
1300 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1301 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1302
1303# Deprecated. It is no-op now.
1304PHONY += headers_check
1305headers_check:
1306 @echo >&2 "=================== WARNING ==================="
1307 @echo >&2 "Since Linux 5.5, 'make headers_check' is no-op,"
1308 @echo >&2 "and will be removed after Linux 5.15 release."
1309 @echo >&2 "Please remove headers_check from your scripts."
1310 @echo >&2 "==============================================="
1311
1312ifdef CONFIG_HEADERS_INSTALL
1313prepare: headers
1314endif
1315
1316PHONY += scripts_unifdef
1317scripts_unifdef: scripts_basic
1318 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1319
1320# ---------------------------------------------------------------------------
1321# Tools
1322
1323ifdef CONFIG_STACK_VALIDATION
1324prepare: tools/objtool
1325endif
1326
1327ifdef CONFIG_BPF
1328ifdef CONFIG_DEBUG_INFO_BTF
1329prepare: tools/bpf/resolve_btfids
1330endif
1331endif
1332
1333PHONY += resolve_btfids_clean
1334
1335resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1336
1337# tools/bpf/resolve_btfids directory might not exist
1338# in output directory, skip its clean in that case
1339resolve_btfids_clean:
1340ifneq ($(wildcard $(resolve_btfids_O)),)
1341 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1342endif
1343
1344# Clear a bunch of variables before executing the submake
1345ifeq ($(quiet),silent_)
1346tools_silent=s
1347endif
1348
1349tools/: FORCE
1350 $(Q)mkdir -p $(objtree)/tools
1351 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1352
1353tools/%: FORCE
1354 $(Q)mkdir -p $(objtree)/tools
1355 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1356
1357# ---------------------------------------------------------------------------
1358# Kernel selftest
1359
1360PHONY += kselftest
1361kselftest:
1362 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1363
1364kselftest-%: FORCE
1365 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1366
1367PHONY += kselftest-merge
1368kselftest-merge:
1369 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1370 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1371 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1372 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1373
1374# ---------------------------------------------------------------------------
1375# Devicetree files
1376
1377ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1378dtstree := arch/$(SRCARCH)/boot/dts
1379endif
1380
1381ifneq ($(dtstree),)
1382
1383%.dtb: include/config/kernel.release scripts_dtc
1384 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1385
1386%.dtbo: include/config/kernel.release scripts_dtc
1387 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1388
1389PHONY += dtbs dtbs_install dtbs_check
1390dtbs: include/config/kernel.release scripts_dtc
1391 $(Q)$(MAKE) $(build)=$(dtstree)
1392
1393ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1394export CHECK_DTBS=y
1395dtbs: dt_binding_check
1396endif
1397
1398dtbs_check: dtbs
1399
1400dtbs_install:
1401 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1402
1403ifdef CONFIG_OF_EARLY_FLATTREE
1404all: dtbs
1405endif
1406
1407endif
1408
1409PHONY += scripts_dtc
1410scripts_dtc: scripts_basic
1411 $(Q)$(MAKE) $(build)=scripts/dtc
1412
1413ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1414export CHECK_DT_BINDING=y
1415endif
1416
1417PHONY += dt_binding_check
1418dt_binding_check: scripts_dtc
1419 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1420
1421# ---------------------------------------------------------------------------
1422# Modules
1423
1424ifdef CONFIG_MODULES
1425
1426# By default, build modules as well
1427
1428all: modules
1429
1430# When we're building modules with modversions, we need to consider
1431# the built-in objects during the descend as well, in order to
1432# make sure the checksums are up to date before we record them.
1433ifdef CONFIG_MODVERSIONS
1434 KBUILD_BUILTIN := 1
1435endif
1436
1437# Build modules
1438#
1439# A module can be listed more than once in obj-m resulting in
1440# duplicate lines in modules.order files. Those are removed
1441# using awk while concatenating to the final file.
1442
1443PHONY += modules
1444modules: $(if $(KBUILD_BUILTIN),vmlinux) modules_check modules_prepare
1445
1446cmd_modules_order = $(AWK) '!x[$$0]++' $(real-prereqs) > $@
1447
1448modules.order: $(subdir-modorder) FORCE
1449 $(call if_changed,modules_order)
1450
1451targets += modules.order
1452
1453# Target to prepare building external modules
1454PHONY += modules_prepare
1455modules_prepare: prepare
1456 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1457
1458export modules_sign_only :=
1459
1460ifeq ($(CONFIG_MODULE_SIG),y)
1461PHONY += modules_sign
1462modules_sign: modules_install
1463 @:
1464
1465# modules_sign is a subset of modules_install.
1466# 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1467ifeq ($(filter modules_install,$(MAKECMDGOALS)),)
1468modules_sign_only := y
1469endif
1470endif
1471
1472modinst_pre :=
1473ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
1474modinst_pre := __modinst_pre
1475endif
1476
1477modules_install: $(modinst_pre)
1478PHONY += __modinst_pre
1479__modinst_pre:
1480 @rm -rf $(MODLIB)/kernel
1481 @rm -f $(MODLIB)/source
1482 @mkdir -p $(MODLIB)/kernel
1483 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1484 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1485 rm -f $(MODLIB)/build ; \
1486 ln -s $(CURDIR) $(MODLIB)/build ; \
1487 fi
1488 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1489 @cp -f modules.builtin $(MODLIB)/
1490 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1491
1492endif # CONFIG_MODULES
1493
1494###
1495# Cleaning is done on three levels.
1496# make clean Delete most generated files
1497# Leave enough to build external modules
1498# make mrproper Delete the current configuration, and all generated files
1499# make distclean Remove editor backup files, patch leftover files and the like
1500
1501# Directories & files removed with 'make clean'
1502CLEAN_FILES += include/ksym vmlinux.symvers modules-only.symvers \
1503 modules.builtin modules.builtin.modinfo modules.nsdeps \
1504 compile_commands.json .thinlto-cache
1505
1506# Directories & files removed with 'make mrproper'
1507MRPROPER_FILES += include/config include/generated \
1508 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1509 debian snap tar-install \
1510 .config .config.old .version \
1511 Module.symvers \
1512 certs/signing_key.pem certs/signing_key.x509 \
1513 certs/x509.genkey \
1514 vmlinux-gdb.py \
1515 *.spec
1516
1517# clean - Delete most, but leave enough to build external modules
1518#
1519clean: rm-files := $(CLEAN_FILES)
1520
1521PHONY += archclean vmlinuxclean
1522
1523vmlinuxclean:
1524 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1525 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1526
1527clean: archclean vmlinuxclean resolve_btfids_clean
1528
1529# mrproper - Delete all generated files, including .config
1530#
1531mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1532mrproper-dirs := $(addprefix _mrproper_,scripts)
1533
1534PHONY += $(mrproper-dirs) mrproper
1535$(mrproper-dirs):
1536 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1537
1538mrproper: clean $(mrproper-dirs)
1539 $(call cmd,rmfiles)
1540
1541# distclean
1542#
1543PHONY += distclean
1544
1545distclean: mrproper
1546 @find . $(RCS_FIND_IGNORE) \
1547 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1548 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1549 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1550 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1551 -type f -print | xargs rm -f
1552
1553
1554# Packaging of the kernel to various formats
1555# ---------------------------------------------------------------------------
1556
1557%src-pkg: FORCE
1558 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1559%pkg: include/config/kernel.release FORCE
1560 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1561
1562# Brief documentation of the typical targets used
1563# ---------------------------------------------------------------------------
1564
1565boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1566boards := $(sort $(notdir $(boards)))
1567board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1568board-dirs := $(sort $(notdir $(board-dirs:/=)))
1569
1570PHONY += help
1571help:
1572 @echo 'Cleaning targets:'
1573 @echo ' clean - Remove most generated files but keep the config and'
1574 @echo ' enough build support to build external modules'
1575 @echo ' mrproper - Remove all generated files + config + various backup files'
1576 @echo ' distclean - mrproper + remove editor backup and patch files'
1577 @echo ''
1578 @echo 'Configuration targets:'
1579 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1580 @echo ''
1581 @echo 'Other generic targets:'
1582 @echo ' all - Build all targets marked with [*]'
1583 @echo '* vmlinux - Build the bare kernel'
1584 @echo '* modules - Build all modules'
1585 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1586 @echo ' dir/ - Build all files in dir and below'
1587 @echo ' dir/file.[ois] - Build specified target only'
1588 @echo ' dir/file.ll - Build the LLVM assembly file'
1589 @echo ' (requires compiler support for LLVM assembly generation)'
1590 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1591 @echo ' (requires a recent binutils and recent build (System.map))'
1592 @echo ' dir/file.ko - Build module including final link'
1593 @echo ' modules_prepare - Set up for building external modules'
1594 @echo ' tags/TAGS - Generate tags file for editors'
1595 @echo ' cscope - Generate cscope index'
1596 @echo ' gtags - Generate GNU GLOBAL index'
1597 @echo ' kernelrelease - Output the release version string (use with make -s)'
1598 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1599 @echo ' image_name - Output the image name (use with make -s)'
1600 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1601 echo ' (default: $(INSTALL_HDR_PATH))'; \
1602 echo ''
1603 @echo 'Static analysers:'
1604 @echo ' checkstack - Generate a list of stack hogs'
1605 @echo ' versioncheck - Sanity check on version.h usage'
1606 @echo ' includecheck - Check for duplicate included header files'
1607 @echo ' export_report - List the usages of all exported symbols'
1608 @echo ' headerdep - Detect inclusion cycles in headers'
1609 @echo ' coccicheck - Check with Coccinelle'
1610 @echo ' clang-analyzer - Check with clang static analyzer'
1611 @echo ' clang-tidy - Check with clang-tidy'
1612 @echo ''
1613 @echo 'Tools:'
1614 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1615 @echo ''
1616 @echo 'Kernel selftest:'
1617 @echo ' kselftest - Build and run kernel selftest'
1618 @echo ' Build, install, and boot kernel before'
1619 @echo ' running kselftest on it'
1620 @echo ' Run as root for full coverage'
1621 @echo ' kselftest-all - Build kernel selftest'
1622 @echo ' kselftest-install - Build and install kernel selftest'
1623 @echo ' kselftest-clean - Remove all generated kselftest files'
1624 @echo ' kselftest-merge - Merge all the config dependencies of'
1625 @echo ' kselftest to existing .config.'
1626 @echo ''
1627 @$(if $(dtstree), \
1628 echo 'Devicetree:'; \
1629 echo '* dtbs - Build device tree blobs for enabled boards'; \
1630 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1631 echo ' dt_binding_check - Validate device tree binding documents'; \
1632 echo ' dtbs_check - Validate device tree source files';\
1633 echo '')
1634
1635 @echo 'Userspace tools targets:'
1636 @echo ' use "make tools/help"'
1637 @echo ' or "cd tools; make help"'
1638 @echo ''
1639 @echo 'Kernel packaging:'
1640 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1641 @echo ''
1642 @echo 'Documentation targets:'
1643 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1644 @echo ''
1645 @echo 'Architecture specific targets ($(SRCARCH)):'
1646 @$(if $(archhelp),$(archhelp),\
1647 echo ' No architecture specific help defined for $(SRCARCH)')
1648 @echo ''
1649 @$(if $(boards), \
1650 $(foreach b, $(boards), \
1651 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1652 echo '')
1653 @$(if $(board-dirs), \
1654 $(foreach b, $(board-dirs), \
1655 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1656 printf " %-16s - Show all of the above\\n" help-boards; \
1657 echo '')
1658
1659 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1660 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1661 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1662 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1663 @echo ' (sparse by default)'
1664 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1665 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1666 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1667 @echo ' 1: warnings which may be relevant and do not occur too often'
1668 @echo ' 2: warnings which occur quite often but may still be relevant'
1669 @echo ' 3: more obscure warnings, can most likely be ignored'
1670 @echo ' Multiple levels can be combined with W=12 or W=123'
1671 @echo ''
1672 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1673 @echo 'For further info see the ./README file'
1674
1675
1676help-board-dirs := $(addprefix help-,$(board-dirs))
1677
1678help-boards: $(help-board-dirs)
1679
1680boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1681
1682$(help-board-dirs): help-%:
1683 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1684 @$(if $(boards-per-dir), \
1685 $(foreach b, $(boards-per-dir), \
1686 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1687 echo '')
1688
1689
1690# Documentation targets
1691# ---------------------------------------------------------------------------
1692DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1693 linkcheckdocs dochelp refcheckdocs
1694PHONY += $(DOC_TARGETS)
1695$(DOC_TARGETS):
1696 $(Q)$(MAKE) $(build)=Documentation $@
1697
1698# Misc
1699# ---------------------------------------------------------------------------
1700
1701PHONY += scripts_gdb
1702scripts_gdb: prepare0
1703 $(Q)$(MAKE) $(build)=scripts/gdb
1704 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1705
1706ifdef CONFIG_GDB_SCRIPTS
1707all: scripts_gdb
1708endif
1709
1710else # KBUILD_EXTMOD
1711
1712###
1713# External module support.
1714# When building external modules the kernel used as basis is considered
1715# read-only, and no consistency checks are made and the make
1716# system is not used on the basis kernel. If updates are required
1717# in the basis kernel ordinary make commands (without M=...) must be used.
1718
1719# We are always building only modules.
1720KBUILD_BUILTIN :=
1721KBUILD_MODULES := 1
1722
1723build-dirs := $(KBUILD_EXTMOD)
1724$(MODORDER): descend
1725 @:
1726
1727compile_commands.json: $(extmod_prefix)compile_commands.json
1728PHONY += compile_commands.json
1729
1730clean-dirs := $(KBUILD_EXTMOD)
1731clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1732 $(KBUILD_EXTMOD)/compile_commands.json $(KBUILD_EXTMOD)/.thinlto-cache
1733
1734PHONY += help
1735help:
1736 @echo ' Building external modules.'
1737 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1738 @echo ''
1739 @echo ' modules - default target, build the module(s)'
1740 @echo ' modules_install - install the module'
1741 @echo ' clean - remove generated files in module directory only'
1742 @echo ''
1743
1744# no-op for external module builds
1745PHONY += prepare modules_prepare
1746
1747endif # KBUILD_EXTMOD
1748
1749# ---------------------------------------------------------------------------
1750# Modules
1751
1752PHONY += modules modules_install
1753
1754ifdef CONFIG_MODULES
1755
1756modules: modules_check
1757 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1758
1759PHONY += modules_check
1760modules_check: $(MODORDER)
1761 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1762
1763quiet_cmd_depmod = DEPMOD $(MODLIB)
1764 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1765 $(KERNELRELEASE)
1766
1767modules_install:
1768 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1769 $(call cmd,depmod)
1770
1771else # CONFIG_MODULES
1772
1773# Modules not configured
1774# ---------------------------------------------------------------------------
1775
1776modules modules_install:
1777 @echo >&2 '***'
1778 @echo >&2 '*** The present kernel configuration has modules disabled.'
1779 @echo >&2 '*** To use the module feature, please run "make menuconfig" etc.'
1780 @echo >&2 '*** to enable CONFIG_MODULES.'
1781 @echo >&2 '***'
1782 @exit 1
1783
1784endif # CONFIG_MODULES
1785
1786# Single targets
1787# ---------------------------------------------------------------------------
1788# To build individual files in subdirectories, you can do like this:
1789#
1790# make foo/bar/baz.s
1791#
1792# The supported suffixes for single-target are listed in 'single-targets'
1793#
1794# To build only under specific subdirectories, you can do like this:
1795#
1796# make foo/bar/baz/
1797
1798ifdef single-build
1799
1800# .ko is special because modpost is needed
1801single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1802single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1803
1804$(single-ko): single_modpost
1805 @:
1806$(single-no-ko): descend
1807 @:
1808
1809ifeq ($(KBUILD_EXTMOD),)
1810# For the single build of in-tree modules, use a temporary file to avoid
1811# the situation of modules_install installing an invalid modules.order.
1812MODORDER := .modules.tmp
1813endif
1814
1815PHONY += single_modpost
1816single_modpost: $(single-no-ko) modules_prepare
1817 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$m;) } > $(MODORDER)
1818 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1819
1820KBUILD_MODULES := 1
1821
1822export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod_prefix), $(single-no-ko))
1823
1824# trim unrelated directories
1825build-dirs := $(foreach d, $(build-dirs), \
1826 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1827
1828endif
1829
1830ifndef CONFIG_MODULES
1831KBUILD_MODULES :=
1832endif
1833
1834# Handle descending into subdirectories listed in $(build-dirs)
1835# Preset locale variables to speed up the build process. Limit locale
1836# tweaks to this spot to avoid wrong language settings when running
1837# make menuconfig etc.
1838# Error messages still appears in the original language
1839PHONY += descend $(build-dirs)
1840descend: $(build-dirs)
1841$(build-dirs): prepare
1842 $(Q)$(MAKE) $(build)=$@ \
1843 single-build=$(if $(filter-out $@/, $(filter $@/%, $(KBUILD_SINGLE_TARGETS))),1) \
1844 need-builtin=1 need-modorder=1
1845
1846clean-dirs := $(addprefix _clean_, $(clean-dirs))
1847PHONY += $(clean-dirs) clean
1848$(clean-dirs):
1849 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1850
1851clean: $(clean-dirs)
1852 $(call cmd,rmfiles)
1853 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1854 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1855 -o -name '*.ko.*' \
1856 -o -name '*.dtb' -o -name '*.dtbo' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1857 -o -name '*.dwo' -o -name '*.lst' \
1858 -o -name '*.su' -o -name '*.mod' \
1859 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1860 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1861 -o -name '*.asn1.[ch]' \
1862 -o -name '*.symtypes' -o -name 'modules.order' \
1863 -o -name '.tmp_*.o.*' \
1864 -o -name '*.c.[012]*.*' \
1865 -o -name '*.ll' \
1866 -o -name '*.gcno' \
1867 -o -name '*.*.symversions' \) -type f -print | xargs rm -f
1868
1869# Generate tags for editors
1870# ---------------------------------------------------------------------------
1871quiet_cmd_tags = GEN $@
1872 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1873
1874tags TAGS cscope gtags: FORCE
1875 $(call cmd,tags)
1876
1877# Script to generate missing namespace dependencies
1878# ---------------------------------------------------------------------------
1879
1880PHONY += nsdeps
1881nsdeps: export KBUILD_NSDEPS=1
1882nsdeps: modules
1883 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1884
1885# Clang Tooling
1886# ---------------------------------------------------------------------------
1887
1888quiet_cmd_gen_compile_commands = GEN $@
1889 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1890
1891$(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1892 $(if $(KBUILD_EXTMOD),,$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)) \
1893 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1894 $(call if_changed,gen_compile_commands)
1895
1896targets += $(extmod_prefix)compile_commands.json
1897
1898PHONY += clang-tidy clang-analyzer
1899
1900ifdef CONFIG_CC_IS_CLANG
1901quiet_cmd_clang_tools = CHECK $<
1902 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1903
1904clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1905 $(call cmd,clang_tools)
1906else
1907clang-tidy clang-analyzer:
1908 @echo "$@ requires CC=clang" >&2
1909 @false
1910endif
1911
1912# Scripts to check various things for consistency
1913# ---------------------------------------------------------------------------
1914
1915PHONY += includecheck versioncheck coccicheck export_report
1916
1917includecheck:
1918 find $(srctree)/* $(RCS_FIND_IGNORE) \
1919 -name '*.[hcS]' -type f -print | sort \
1920 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1921
1922versioncheck:
1923 find $(srctree)/* $(RCS_FIND_IGNORE) \
1924 -name '*.[hcS]' -type f -print | sort \
1925 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1926
1927coccicheck:
1928 $(Q)$(BASH) $(srctree)/scripts/$@
1929
1930export_report:
1931 $(PERL) $(srctree)/scripts/export_report.pl
1932
1933PHONY += checkstack kernelrelease kernelversion image_name
1934
1935# UML needs a little special treatment here. It wants to use the host
1936# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1937# else wants $(ARCH), including people doing cross-builds, which means
1938# that $(SUBARCH) doesn't work here.
1939ifeq ($(ARCH), um)
1940CHECKSTACK_ARCH := $(SUBARCH)
1941else
1942CHECKSTACK_ARCH := $(ARCH)
1943endif
1944checkstack:
1945 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1946 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1947
1948kernelrelease:
1949 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1950
1951kernelversion:
1952 @echo $(KERNELVERSION)
1953
1954image_name:
1955 @echo $(KBUILD_IMAGE)
1956
1957quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1958 cmd_rmfiles = rm -rf $(rm-files)
1959
1960# read saved command lines for existing targets
1961existing-targets := $(wildcard $(sort $(targets)))
1962
1963-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1964
1965endif # config-build
1966endif # mixed-build
1967endif # need-sub-make
1968
1969PHONY += FORCE
1970FORCE:
1971
1972# Declare the contents of the PHONY variable as phony. We keep that
1973# information in a variable so we can use it in if_changed and friends.
1974.PHONY: $(PHONY)