xref: /openbmc/linux/Makefile (revision 5edb7691)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 6
4SUBLEVEL = 0
5EXTRAVERSION =
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# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# We are using a recursive build, so we need to do a little thinking
19# to get the ordering right.
20#
21# Most importantly: sub-Makefiles should only ever modify files in
22# their own directory. If in some directory we have a dependency on
23# a file in another dir (which doesn't happen often, but it's often
24# unavoidable when linking the built-in.a targets which finally
25# turn into vmlinux), we will call a sub make in that other dir, and
26# after that we are sure that everything which is in that other dir
27# is now up to date.
28#
29# The only cases where we need to modify files which have global
30# effects are thus separated out and done before the recursive
31# descending is started. They are now explicitly listed as the
32# prepare rule.
33
34ifneq ($(sub_make_done),1)
35
36# Do not use make's built-in rules and variables
37# (this increases performance and avoids hard-to-debug behaviour)
38MAKEFLAGS += -rR
39
40# Avoid funny character set dependencies
41unexport LC_ALL
42LC_COLLATE=C
43LC_NUMERIC=C
44export LC_COLLATE LC_NUMERIC
45
46# Avoid interference with shell env settings
47unexport GREP_OPTIONS
48
49# Beautify output
50# ---------------------------------------------------------------------------
51#
52# Normally, we echo the whole command before executing it. By making
53# that echo $($(quiet)$(cmd)), we now have the possibility to set
54# $(quiet) to choose other forms of output instead, e.g.
55#
56#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
58#
59# If $(quiet) is empty, the whole command will be printed.
60# If it is set to "quiet_", only the short version will be printed.
61# If it is set to "silent_", nothing will be printed at all, since
62# the variable $(silent_cmd_cc_o_c) doesn't exist.
63#
64# A simple variant is to prefix commands with $(Q) - that's useful
65# for commands that shall be hidden in non-verbose mode.
66#
67#	$(Q)ln $@ :<
68#
69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
71# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
72#
73# To put more focus on warnings, be less verbose as default
74# Use 'make V=1' to see the full commands
75
76ifeq ("$(origin V)", "command line")
77  KBUILD_VERBOSE = $(V)
78endif
79ifndef KBUILD_VERBOSE
80  KBUILD_VERBOSE = 0
81endif
82
83ifeq ($(KBUILD_VERBOSE),1)
84  quiet =
85  Q =
86else
87  quiet=quiet_
88  Q = @
89endif
90
91# If the user is running make -s (silent mode), suppress echoing of
92# commands
93
94ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
95  quiet=silent_
96endif
97
98export quiet Q KBUILD_VERBOSE
99
100# Kbuild will save output files in the current working directory.
101# This does not need to match to the root of the kernel source tree.
102#
103# For example, you can do this:
104#
105#  cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106#
107# If you want to save output files in a different location, there are
108# two syntaxes to specify it.
109#
110# 1) O=
111# Use "make O=dir/to/store/output/files/"
112#
113# 2) Set KBUILD_OUTPUT
114# Set the environment variable KBUILD_OUTPUT to point to the output directory.
115# export KBUILD_OUTPUT=dir/to/store/output/files/; make
116#
117# The O= assignment takes precedence over the KBUILD_OUTPUT environment
118# variable.
119
120# Do we want to change the working directory?
121ifeq ("$(origin O)", "command line")
122  KBUILD_OUTPUT := $(O)
123endif
124
125ifneq ($(KBUILD_OUTPUT),)
126# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
127# expand a shell special character '~'. We use a somewhat tedious way here.
128abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
129$(if $(abs_objtree),, \
130     $(error failed to create output directory "$(KBUILD_OUTPUT)"))
131
132# $(realpath ...) resolves symlinks
133abs_objtree := $(realpath $(abs_objtree))
134else
135abs_objtree := $(CURDIR)
136endif # ifneq ($(KBUILD_OUTPUT),)
137
138ifeq ($(abs_objtree),$(CURDIR))
139# Suppress "Entering directory ..." unless we are changing the work directory.
140MAKEFLAGS += --no-print-directory
141else
142need-sub-make := 1
143endif
144
145abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
146
147ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
148$(error source directory cannot contain spaces or colons)
149endif
150
151ifneq ($(abs_srctree),$(abs_objtree))
152# Look for make include files relative to root of kernel src
153#
154# This does not become effective immediately because MAKEFLAGS is re-parsed
155# once after the Makefile is read. We need to invoke sub-make.
156MAKEFLAGS += --include-dir=$(abs_srctree)
157need-sub-make := 1
158endif
159
160ifneq ($(filter 3.%,$(MAKE_VERSION)),)
161# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
162# We need to invoke sub-make to avoid implicit rules in the top Makefile.
163need-sub-make := 1
164# Cancel implicit rules for this Makefile.
165$(lastword $(MAKEFILE_LIST)): ;
166endif
167
168export abs_srctree abs_objtree
169export sub_make_done := 1
170
171ifeq ($(need-sub-make),1)
172
173PHONY += $(MAKECMDGOALS) sub-make
174
175$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
176	@:
177
178# Invoke a second make in the output directory, passing relevant variables
179sub-make:
180	$(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
181
182endif # need-sub-make
183endif # sub_make_done
184
185# We process the rest of the Makefile if this is the final invocation of make
186ifeq ($(need-sub-make),)
187
188# Do not print "Entering directory ...",
189# but we want to display it when entering to the output directory
190# so that IDEs/editors are able to understand relative filenames.
191MAKEFLAGS += --no-print-directory
192
193# Call a source code checker (by default, "sparse") as part of the
194# C compilation.
195#
196# Use 'make C=1' to enable checking of only re-compiled files.
197# Use 'make C=2' to enable checking of *all* source files, regardless
198# of whether they are re-compiled or not.
199#
200# See the file "Documentation/dev-tools/sparse.rst" for more details,
201# including where to get the "sparse" utility.
202
203ifeq ("$(origin C)", "command line")
204  KBUILD_CHECKSRC = $(C)
205endif
206ifndef KBUILD_CHECKSRC
207  KBUILD_CHECKSRC = 0
208endif
209
210# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
211# directory of external module to build. Setting M= takes precedence.
212ifeq ("$(origin M)", "command line")
213  KBUILD_EXTMOD := $(M)
214endif
215
216export KBUILD_CHECKSRC KBUILD_EXTMOD
217
218extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
219
220ifeq ($(abs_srctree),$(abs_objtree))
221        # building in the source tree
222        srctree := .
223	building_out_of_srctree :=
224else
225        ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
226                # building in a subdirectory of the source tree
227                srctree := ..
228        else
229                srctree := $(abs_srctree)
230        endif
231	building_out_of_srctree := 1
232endif
233
234ifneq ($(KBUILD_ABS_SRCTREE),)
235srctree := $(abs_srctree)
236endif
237
238objtree		:= .
239VPATH		:= $(srctree)
240
241export building_out_of_srctree srctree objtree VPATH
242
243# To make sure we do not include .config for any of the *config targets
244# catch them early, and hand them over to scripts/kconfig/Makefile
245# It is allowed to specify more targets when calling make, including
246# mixing *config targets and build targets.
247# For example 'make oldconfig all'.
248# Detect when mixed targets is specified, and make a second invocation
249# of make so .config is not included in this case either (for *config).
250
251version_h := include/generated/uapi/linux/version.h
252old_version_h := include/linux/version.h
253
254clean-targets := %clean mrproper cleandocs
255no-dot-config-targets := $(clean-targets) \
256			 cscope gtags TAGS tags help% %docs check% coccicheck \
257			 $(version_h) headers headers_% archheaders archscripts \
258			 %asm-generic kernelversion %src-pkg
259no-sync-config-targets := $(no-dot-config-targets) install %install \
260			   kernelrelease
261single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
262
263config-build	:=
264mixed-build	:=
265need-config	:= 1
266may-sync-config	:= 1
267single-build	:=
268
269ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
270	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
271		need-config :=
272	endif
273endif
274
275ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
276	ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
277		may-sync-config :=
278	endif
279endif
280
281ifneq ($(KBUILD_EXTMOD),)
282	may-sync-config :=
283endif
284
285ifeq ($(KBUILD_EXTMOD),)
286        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
287		config-build := 1
288                ifneq ($(words $(MAKECMDGOALS)),1)
289			mixed-build := 1
290                endif
291        endif
292endif
293
294# We cannot build single targets and the others at the same time
295ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
296	single-build := 1
297	ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
298		mixed-build := 1
299	endif
300endif
301
302# For "make -j clean all", "make -j mrproper defconfig all", etc.
303ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
304        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
305		mixed-build := 1
306        endif
307endif
308
309# install and modules_install need also be processed one by one
310ifneq ($(filter install,$(MAKECMDGOALS)),)
311        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
312		mixed-build := 1
313        endif
314endif
315
316ifdef mixed-build
317# ===========================================================================
318# We're called with mixed targets (*config and build targets).
319# Handle them one by one.
320
321PHONY += $(MAKECMDGOALS) __build_one_by_one
322
323$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
324	@:
325
326__build_one_by_one:
327	$(Q)set -e; \
328	for i in $(MAKECMDGOALS); do \
329		$(MAKE) -f $(srctree)/Makefile $$i; \
330	done
331
332else # !mixed-build
333
334include scripts/Kbuild.include
335
336# Read KERNELRELEASE from include/config/kernel.release (if it exists)
337KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
338KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
339export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
340
341include scripts/subarch.include
342
343# Cross compiling and selecting different set of gcc/bin-utils
344# ---------------------------------------------------------------------------
345#
346# When performing cross compilation for other architectures ARCH shall be set
347# to the target architecture. (See arch/* for the possibilities).
348# ARCH can be set during invocation of make:
349# make ARCH=ia64
350# Another way is to have ARCH set in the environment.
351# The default ARCH is the host where make is executed.
352
353# CROSS_COMPILE specify the prefix used for all executables used
354# during compilation. Only gcc and related bin-utils executables
355# are prefixed with $(CROSS_COMPILE).
356# CROSS_COMPILE can be set on the command line
357# make CROSS_COMPILE=ia64-linux-
358# Alternatively CROSS_COMPILE can be set in the environment.
359# Default value for CROSS_COMPILE is not to prefix executables
360# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
361ARCH		?= $(SUBARCH)
362
363# Architecture as present in compile.h
364UTS_MACHINE 	:= $(ARCH)
365SRCARCH 	:= $(ARCH)
366
367# Additional ARCH settings for x86
368ifeq ($(ARCH),i386)
369        SRCARCH := x86
370endif
371ifeq ($(ARCH),x86_64)
372        SRCARCH := x86
373endif
374
375# Additional ARCH settings for sparc
376ifeq ($(ARCH),sparc32)
377       SRCARCH := sparc
378endif
379ifeq ($(ARCH),sparc64)
380       SRCARCH := sparc
381endif
382
383# Additional ARCH settings for sh
384ifeq ($(ARCH),sh64)
385       SRCARCH := sh
386endif
387
388KCONFIG_CONFIG	?= .config
389export KCONFIG_CONFIG
390
391# SHELL used by kbuild
392CONFIG_SHELL := sh
393
394HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
395HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
396HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
397
398HOSTCC       = gcc
399HOSTCXX      = g++
400KBUILD_HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
401		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
402		$(HOSTCFLAGS)
403KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
404KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
405KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
406
407# Make variables (CC, etc...)
408AS		= $(CROSS_COMPILE)as
409LD		= $(CROSS_COMPILE)ld
410CC		= $(CROSS_COMPILE)gcc
411CPP		= $(CC) -E
412AR		= $(CROSS_COMPILE)ar
413NM		= $(CROSS_COMPILE)nm
414STRIP		= $(CROSS_COMPILE)strip
415OBJCOPY		= $(CROSS_COMPILE)objcopy
416OBJDUMP		= $(CROSS_COMPILE)objdump
417OBJSIZE		= $(CROSS_COMPILE)size
418READELF		= $(CROSS_COMPILE)readelf
419PAHOLE		= pahole
420LEX		= flex
421YACC		= bison
422AWK		= awk
423INSTALLKERNEL  := installkernel
424DEPMOD		= /sbin/depmod
425PERL		= perl
426PYTHON		= python
427PYTHON3		= python3
428CHECK		= sparse
429BASH		= bash
430
431CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
432		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
433NOSTDINC_FLAGS :=
434CFLAGS_MODULE   =
435AFLAGS_MODULE   =
436LDFLAGS_MODULE  =
437CFLAGS_KERNEL	=
438AFLAGS_KERNEL	=
439LDFLAGS_vmlinux =
440
441# Use USERINCLUDE when you must reference the UAPI directories only.
442USERINCLUDE    := \
443		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
444		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
445		-I$(srctree)/include/uapi \
446		-I$(objtree)/include/generated/uapi \
447                -include $(srctree)/include/linux/kconfig.h
448
449# Use LINUXINCLUDE when you must reference the include/ directory.
450# Needed to be compatible with the O= option
451LINUXINCLUDE    := \
452		-I$(srctree)/arch/$(SRCARCH)/include \
453		-I$(objtree)/arch/$(SRCARCH)/include/generated \
454		$(if $(building_out_of_srctree),-I$(srctree)/include) \
455		-I$(objtree)/include \
456		$(USERINCLUDE)
457
458KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
459KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
460		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
461		   -Werror=implicit-function-declaration -Werror=implicit-int \
462		   -Wno-format-security \
463		   -std=gnu89
464KBUILD_CPPFLAGS := -D__KERNEL__
465KBUILD_AFLAGS_KERNEL :=
466KBUILD_CFLAGS_KERNEL :=
467KBUILD_AFLAGS_MODULE  := -DMODULE
468KBUILD_CFLAGS_MODULE  := -DMODULE
469KBUILD_LDFLAGS_MODULE :=
470export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
471KBUILD_LDFLAGS :=
472GCC_PLUGINS_CFLAGS :=
473CLANG_FLAGS :=
474
475export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
476export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
477export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
478export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
479
480export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
481export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
482export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
483export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
484export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
485export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
486
487# Files to ignore in find ... statements
488
489export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
490			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
491			  -prune -o
492export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
493			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
494
495# ===========================================================================
496# Rules shared between *config targets and build targets
497
498# Basic helpers built in scripts/basic/
499PHONY += scripts_basic
500scripts_basic:
501	$(Q)$(MAKE) $(build)=scripts/basic
502	$(Q)rm -f .tmp_quiet_recordmcount
503
504PHONY += outputmakefile
505# Before starting out-of-tree build, make sure the source tree is clean.
506# outputmakefile generates a Makefile in the output directory, if using a
507# separate output directory. This allows convenient use of make in the
508# output directory.
509# At the same time when output Makefile generated, generate .gitignore to
510# ignore whole output directory
511outputmakefile:
512ifdef building_out_of_srctree
513	$(Q)if [ -f $(srctree)/.config -o \
514		 -d $(srctree)/include/config -o \
515		 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
516		echo >&2 "***"; \
517		echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
518		echo >&2 "*** in $(abs_srctree)";\
519		echo >&2 "***"; \
520		false; \
521	fi
522	$(Q)ln -fsn $(srctree) source
523	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
524	$(Q)test -e .gitignore || \
525	{ echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
526endif
527
528ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
529ifneq ($(CROSS_COMPILE),)
530CLANG_FLAGS	+= --target=$(notdir $(CROSS_COMPILE:%-=%))
531GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
532CLANG_FLAGS	+= --prefix=$(GCC_TOOLCHAIN_DIR)
533GCC_TOOLCHAIN	:= $(realpath $(GCC_TOOLCHAIN_DIR)/..)
534endif
535ifneq ($(GCC_TOOLCHAIN),)
536CLANG_FLAGS	+= --gcc-toolchain=$(GCC_TOOLCHAIN)
537endif
538ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
539CLANG_FLAGS	+= -no-integrated-as
540endif
541CLANG_FLAGS	+= -Werror=unknown-warning-option
542KBUILD_CFLAGS	+= $(CLANG_FLAGS)
543KBUILD_AFLAGS	+= $(CLANG_FLAGS)
544export CLANG_FLAGS
545endif
546
547# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
548# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
549# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
550# and from include/config/auto.conf.cmd to detect the compiler upgrade.
551CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
552
553ifdef config-build
554# ===========================================================================
555# *config targets only - make sure prerequisites are updated, and descend
556# in scripts/kconfig to make the *config target
557
558# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
559# KBUILD_DEFCONFIG may point out an alternative default configuration
560# used for 'make defconfig'
561include arch/$(SRCARCH)/Makefile
562export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
563
564config: outputmakefile scripts_basic FORCE
565	$(Q)$(MAKE) $(build)=scripts/kconfig $@
566
567%config: outputmakefile scripts_basic FORCE
568	$(Q)$(MAKE) $(build)=scripts/kconfig $@
569
570else #!config-build
571# ===========================================================================
572# Build targets only - this includes vmlinux, arch specific targets, clean
573# targets and others. In general all targets except *config targets.
574
575# If building an external module we do not care about the all: rule
576# but instead _all depend on modules
577PHONY += all
578ifeq ($(KBUILD_EXTMOD),)
579_all: all
580else
581_all: modules
582endif
583
584# Decide whether to build built-in, modular, or both.
585# Normally, just do built-in.
586
587KBUILD_MODULES :=
588KBUILD_BUILTIN := 1
589
590# If we have only "make modules", don't compile built-in objects.
591# When we're building modules with modversions, we need to consider
592# the built-in objects during the descend as well, in order to
593# make sure the checksums are up to date before we record them.
594
595ifeq ($(MAKECMDGOALS),modules)
596  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
597endif
598
599# If we have "make <whatever> modules", compile modules
600# in addition to whatever we do anyway.
601# Just "make" or "make all" shall build modules as well
602
603ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
604  KBUILD_MODULES := 1
605endif
606
607ifeq ($(MAKECMDGOALS),)
608  KBUILD_MODULES := 1
609endif
610
611export KBUILD_MODULES KBUILD_BUILTIN
612
613ifdef need-config
614include include/config/auto.conf
615endif
616
617ifeq ($(KBUILD_EXTMOD),)
618# Objects we will link into vmlinux / subdirs we need to visit
619init-y		:= init/
620drivers-y	:= drivers/ sound/
621drivers-$(CONFIG_SAMPLES) += samples/
622net-y		:= net/
623libs-y		:= lib/
624core-y		:= usr/
625virt-y		:= virt/
626endif # KBUILD_EXTMOD
627
628# The all: target is the default when no target is given on the
629# command line.
630# This allow a user to issue only 'make' to build a kernel including modules
631# Defaults to vmlinux, but the arch makefile usually adds further targets
632all: vmlinux
633
634CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
635	$(call cc-option,-fno-tree-loop-im) \
636	$(call cc-disable-warning,maybe-uninitialized,)
637export CFLAGS_GCOV
638
639# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
640ifdef CONFIG_FUNCTION_TRACER
641  CC_FLAGS_FTRACE := -pg
642endif
643
644RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
645RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
646RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
647RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
648RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
649RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
650export RETPOLINE_CFLAGS
651export RETPOLINE_VDSO_CFLAGS
652
653include arch/$(SRCARCH)/Makefile
654
655ifdef need-config
656ifdef may-sync-config
657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
659# because some architectures define CROSS_COMPILE there.
660include include/config/auto.conf.cmd
661
662$(KCONFIG_CONFIG):
663	@echo >&2 '***'
664	@echo >&2 '*** Configuration file "$@" not found!'
665	@echo >&2 '***'
666	@echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
667	@echo >&2 '*** "make menuconfig" or "make xconfig").'
668	@echo >&2 '***'
669	@/bin/false
670
671# The actual configuration files used during the build are stored in
672# include/generated/ and include/config/. Update them if .config is newer than
673# include/config/auto.conf (which mirrors .config).
674#
675# This exploits the 'multi-target pattern rule' trick.
676# The syncconfig should be executed only once to make all the targets.
677%/auto.conf %/auto.conf.cmd: $(KCONFIG_CONFIG)
678	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679else # !may-sync-config
680# External modules and some install targets need include/generated/autoconf.h
681# and include/config/auto.conf but do not care if they are up-to-date.
682# Use auto.conf to trigger the test
683PHONY += include/config/auto.conf
684
685include/config/auto.conf:
686	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
687	echo >&2;							\
688	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
689	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
690	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
691	echo >&2 ;							\
692	/bin/false)
693
694endif # may-sync-config
695endif # need-config
696
697KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
698KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
699KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
700KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
701KBUILD_CFLAGS	+= $(call cc-disable-warning, address-of-packed-member)
702
703ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
704KBUILD_CFLAGS += -O2
705else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
706KBUILD_CFLAGS += -O3
707else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
708KBUILD_CFLAGS += -Os
709endif
710
711ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
712KBUILD_CFLAGS   += -Wno-maybe-uninitialized
713endif
714
715# Tell gcc to never replace conditional load with a non-conditional one
716KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
717
718include scripts/Makefile.kcov
719include scripts/Makefile.gcc-plugins
720
721ifdef CONFIG_READABLE_ASM
722# Disable optimizations that make assembler listings hard to read.
723# reorder blocks reorders the control in the function
724# ipa clone creates specialized cloned functions
725# partial inlining inlines only parts of functions
726KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
727                 $(call cc-option,-fno-ipa-cp-clone,) \
728                 $(call cc-option,-fno-partial-inlining)
729endif
730
731ifneq ($(CONFIG_FRAME_WARN),0)
732KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
733endif
734
735stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
736stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
737stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
738
739KBUILD_CFLAGS += $(stackp-flags-y)
740
741ifdef CONFIG_CC_IS_CLANG
742KBUILD_CPPFLAGS += -Qunused-arguments
743KBUILD_CFLAGS += -Wno-format-invalid-specifier
744KBUILD_CFLAGS += -Wno-gnu
745# Quiet clang warning: comparison of unsigned expression < 0 is always false
746KBUILD_CFLAGS += -Wno-tautological-compare
747# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
748# source of a reference will be _MergedGlobals and not on of the whitelisted names.
749# See modpost pattern 2
750KBUILD_CFLAGS += -mno-global-merge
751else
752
753# These warnings generated too much noise in a regular build.
754# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
755KBUILD_CFLAGS += -Wno-unused-but-set-variable
756
757# Warn about unmarked fall-throughs in switch statement.
758# Disabled for clang while comment to attribute conversion happens and
759# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
760KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
761endif
762
763KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
764ifdef CONFIG_FRAME_POINTER
765KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
766else
767# Some targets (ARM with Thumb2, for example), can't be built with frame
768# pointers.  For those, we don't have FUNCTION_TRACER automatically
769# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
770# incompatible with -fomit-frame-pointer with current GCC, so we don't use
771# -fomit-frame-pointer with FUNCTION_TRACER.
772ifndef CONFIG_FUNCTION_TRACER
773KBUILD_CFLAGS	+= -fomit-frame-pointer
774endif
775endif
776
777# Initialize all stack variables with a pattern, if desired.
778ifdef CONFIG_INIT_STACK_ALL
779KBUILD_CFLAGS	+= -ftrivial-auto-var-init=pattern
780endif
781
782DEBUG_CFLAGS	:= $(call cc-option, -fno-var-tracking-assignments)
783
784ifdef CONFIG_DEBUG_INFO
785ifdef CONFIG_DEBUG_INFO_SPLIT
786DEBUG_CFLAGS	+= -gsplit-dwarf
787else
788DEBUG_CFLAGS	+= -g
789endif
790KBUILD_AFLAGS	+= -Wa,-gdwarf-2
791endif
792ifdef CONFIG_DEBUG_INFO_DWARF4
793DEBUG_CFLAGS	+= -gdwarf-4
794endif
795
796ifdef CONFIG_DEBUG_INFO_REDUCED
797DEBUG_CFLAGS	+= $(call cc-option, -femit-struct-debug-baseonly) \
798		   $(call cc-option,-fno-var-tracking)
799endif
800
801KBUILD_CFLAGS += $(DEBUG_CFLAGS)
802export DEBUG_CFLAGS
803
804ifdef CONFIG_FUNCTION_TRACER
805ifdef CONFIG_FTRACE_MCOUNT_RECORD
806  # gcc 5 supports generating the mcount tables directly
807  ifeq ($(call cc-option-yn,-mrecord-mcount),y)
808    CC_FLAGS_FTRACE	+= -mrecord-mcount
809    export CC_USING_RECORD_MCOUNT := 1
810  endif
811  ifdef CONFIG_HAVE_NOP_MCOUNT
812    ifeq ($(call cc-option-yn, -mnop-mcount),y)
813      CC_FLAGS_FTRACE	+= -mnop-mcount
814      CC_FLAGS_USING	+= -DCC_USING_NOP_MCOUNT
815    endif
816  endif
817endif
818ifdef CONFIG_HAVE_FENTRY
819  ifeq ($(call cc-option-yn, -mfentry),y)
820    CC_FLAGS_FTRACE	+= -mfentry
821    CC_FLAGS_USING	+= -DCC_USING_FENTRY
822  endif
823endif
824export CC_FLAGS_FTRACE
825KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
826KBUILD_AFLAGS	+= $(CC_FLAGS_USING)
827ifdef CONFIG_DYNAMIC_FTRACE
828	ifdef CONFIG_HAVE_C_RECORDMCOUNT
829		BUILD_C_RECORDMCOUNT := y
830		export BUILD_C_RECORDMCOUNT
831	endif
832endif
833endif
834
835# We trigger additional mismatches with less inlining
836ifdef CONFIG_DEBUG_SECTION_MISMATCH
837KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
838endif
839
840ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
841KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
842LDFLAGS_vmlinux += --gc-sections
843endif
844
845ifdef CONFIG_LIVEPATCH
846KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
847endif
848
849# arch Makefile may override CC so keep this after arch Makefile is included
850NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
851
852# warn about C99 declaration after statement
853KBUILD_CFLAGS += -Wdeclaration-after-statement
854
855# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
856KBUILD_CFLAGS += -Wvla
857
858# disable pointer signed / unsigned warnings in gcc 4.0
859KBUILD_CFLAGS += -Wno-pointer-sign
860
861# disable stringop warnings in gcc 8+
862KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
863
864# disable invalid "can't wrap" optimizations for signed / pointers
865KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
866
867# clang sets -fmerge-all-constants by default as optimization, but this
868# is non-conforming behavior for C and in fact breaks the kernel, so we
869# need to disable it here generally.
870KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
871
872# for gcc -fno-merge-all-constants disables everything, but it is fine
873# to have actual conforming behavior enabled.
874KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
875
876# Make sure -fstack-check isn't enabled (like gentoo apparently did)
877KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
878
879# conserve stack if available
880KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
881
882# Prohibit date/time macros, which would make the build non-deterministic
883KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
884
885# enforce correct pointer usage
886KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
887
888# Require designated initializers for all marked structures
889KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
890
891# change __FILE__ to the relative path from the srctree
892KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
893
894# ensure -fcf-protection is disabled when using retpoline as it is
895# incompatible with -mindirect-branch=thunk-extern
896ifdef CONFIG_RETPOLINE
897KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
898endif
899
900include scripts/Makefile.kasan
901include scripts/Makefile.extrawarn
902include scripts/Makefile.ubsan
903
904# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
905KBUILD_CPPFLAGS += $(KCPPFLAGS)
906KBUILD_AFLAGS   += $(KAFLAGS)
907KBUILD_CFLAGS   += $(KCFLAGS)
908
909KBUILD_LDFLAGS_MODULE += --build-id
910LDFLAGS_vmlinux += --build-id
911
912ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913LDFLAGS_vmlinux	+= $(call ld-option, -X,)
914endif
915
916ifeq ($(CONFIG_RELR),y)
917LDFLAGS_vmlinux	+= --pack-dyn-relocs=relr
918endif
919
920# make the checker run with the right architecture
921CHECKFLAGS += --arch=$(ARCH)
922
923# insure the checker run with the right endianness
924CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
925
926# the checker needs the correct machine size
927CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
928
929# Default kernel image to build when no specific target is given.
930# KBUILD_IMAGE may be overruled on the command line or
931# set in the environment
932# Also any assignments in arch/$(ARCH)/Makefile take precedence over
933# this default value
934export KBUILD_IMAGE ?= vmlinux
935
936#
937# INSTALL_PATH specifies where to place the updated kernel and system map
938# images. Default is /boot, but you can set it to other values
939export	INSTALL_PATH ?= /boot
940
941#
942# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
943# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
944# an argument if needed. Otherwise it defaults to the kernel install path
945#
946export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
947
948#
949# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
950# relocations required by build roots.  This is not defined in the
951# makefile but the argument can be passed to make if needed.
952#
953
954MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
955export MODLIB
956
957#
958# INSTALL_MOD_STRIP, if defined, will cause modules to be
959# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
960# the default option --strip-debug will be used.  Otherwise,
961# INSTALL_MOD_STRIP value will be used as the options to the strip command.
962
963ifdef INSTALL_MOD_STRIP
964ifeq ($(INSTALL_MOD_STRIP),1)
965mod_strip_cmd = $(STRIP) --strip-debug
966else
967mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
968endif # INSTALL_MOD_STRIP=1
969else
970mod_strip_cmd = true
971endif # INSTALL_MOD_STRIP
972export mod_strip_cmd
973
974# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
975# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
976# or CONFIG_MODULE_COMPRESS_XZ.
977
978mod_compress_cmd = true
979ifdef CONFIG_MODULE_COMPRESS
980  ifdef CONFIG_MODULE_COMPRESS_GZIP
981    mod_compress_cmd = gzip -n -f
982  endif # CONFIG_MODULE_COMPRESS_GZIP
983  ifdef CONFIG_MODULE_COMPRESS_XZ
984    mod_compress_cmd = xz -f
985  endif # CONFIG_MODULE_COMPRESS_XZ
986endif # CONFIG_MODULE_COMPRESS
987export mod_compress_cmd
988
989ifdef CONFIG_MODULE_SIG_ALL
990$(eval $(call config_filename,MODULE_SIG_KEY))
991
992mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
993else
994mod_sign_cmd = true
995endif
996export mod_sign_cmd
997
998HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
999
1000ifdef CONFIG_STACK_VALIDATION
1001  has_libelf := $(call try-run,\
1002		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1003  ifeq ($(has_libelf),1)
1004    objtool_target := tools/objtool FORCE
1005  else
1006    SKIP_STACK_VALIDATION := 1
1007    export SKIP_STACK_VALIDATION
1008  endif
1009endif
1010
1011PHONY += prepare0
1012
1013export MODORDER := $(extmod-prefix)modules.order
1014export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1015
1016ifeq ($(KBUILD_EXTMOD),)
1017core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1018
1019vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1020		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1021		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1022
1023vmlinux-alldirs	:= $(sort $(vmlinux-dirs) Documentation \
1024		     $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1025			$(drivers-) $(net-) $(libs-) $(virt-))))
1026
1027build-dirs	:= $(vmlinux-dirs)
1028clean-dirs	:= $(vmlinux-alldirs)
1029
1030init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
1031core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
1032drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
1033net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
1034libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
1035libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1036virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
1037
1038# Externally visible symbols (used by link-vmlinux.sh)
1039export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1040			      $(drivers-y) $(net-y) $(virt-y)
1041export KBUILD_VMLINUX_LIBS := $(libs-y1)
1042export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
1043export LDFLAGS_vmlinux
1044# used by scripts/Makefile.package
1045export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1046
1047vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1048
1049# Recurse until adjust_autoksyms.sh is satisfied
1050PHONY += autoksyms_recursive
1051ifdef CONFIG_TRIM_UNUSED_KSYMS
1052autoksyms_recursive: descend modules.order
1053	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1054	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
1055endif
1056
1057# For the kernel to actually contain only the needed exported symbols,
1058# we have to build modules as well to determine what those symbols are.
1059# (this can be evaluated only once include/config/auto.conf has been included)
1060ifdef CONFIG_TRIM_UNUSED_KSYMS
1061  KBUILD_MODULES := 1
1062endif
1063
1064autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1065
1066$(autoksyms_h):
1067	$(Q)mkdir -p $(dir $@)
1068	$(Q)touch $@
1069
1070ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1071
1072# Final link of vmlinux with optional arch pass after final link
1073cmd_link-vmlinux =                                                 \
1074	$(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1075	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1076
1077vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1078	+$(call if_changed,link-vmlinux)
1079
1080targets := vmlinux
1081
1082# The actual objects are generated when descending,
1083# make sure no implicit rule kicks in
1084$(sort $(vmlinux-deps)): descend ;
1085
1086filechk_kernel.release = \
1087	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1088
1089# Store (new) KERNELRELEASE string in include/config/kernel.release
1090include/config/kernel.release: FORCE
1091	$(call filechk,kernel.release)
1092
1093# Additional helpers built in scripts/
1094# Carefully list dependencies so we do not try to build scripts twice
1095# in parallel
1096PHONY += scripts
1097scripts: scripts_basic scripts_dtc
1098	$(Q)$(MAKE) $(build)=$(@)
1099
1100# Things we need to do before we recursively start building the kernel
1101# or the modules are listed in "prepare".
1102# A multi level approach is used. prepareN is processed before prepareN-1.
1103# archprepare is used in arch Makefiles and when processed asm symlink,
1104# version.h and scripts_basic is processed / created.
1105
1106PHONY += prepare archprepare
1107
1108archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1109	asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1110
1111prepare0: archprepare
1112	$(Q)$(MAKE) $(build)=scripts/mod
1113	$(Q)$(MAKE) $(build)=.
1114
1115# All the preparing..
1116prepare: prepare0 prepare-objtool
1117
1118# Support for using generic headers in asm-generic
1119asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1120
1121PHONY += asm-generic uapi-asm-generic
1122asm-generic: uapi-asm-generic
1123	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1124	generic=include/asm-generic
1125uapi-asm-generic:
1126	$(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1127	generic=include/uapi/asm-generic
1128
1129PHONY += prepare-objtool
1130prepare-objtool: $(objtool_target)
1131ifeq ($(SKIP_STACK_VALIDATION),1)
1132ifdef CONFIG_UNWINDER_ORC
1133	@echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1134	@false
1135else
1136	@echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1137endif
1138endif
1139
1140# Generate some files
1141# ---------------------------------------------------------------------------
1142
1143# KERNELRELEASE can change from a few different places, meaning version.h
1144# needs to be updated, so this check is forced on all builds
1145
1146uts_len := 64
1147define filechk_utsrelease.h
1148	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1149	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1150	  exit 1;                                                         \
1151	fi;                                                               \
1152	echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1153endef
1154
1155define filechk_version.h
1156	echo \#define LINUX_VERSION_CODE $(shell                         \
1157	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1158	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1159endef
1160
1161$(version_h): FORCE
1162	$(call filechk,version.h)
1163	$(Q)rm -f $(old_version_h)
1164
1165include/generated/utsrelease.h: include/config/kernel.release FORCE
1166	$(call filechk,utsrelease.h)
1167
1168PHONY += headerdep
1169headerdep:
1170	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1171	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1172
1173# ---------------------------------------------------------------------------
1174# Kernel headers
1175
1176#Default location for installed headers
1177export INSTALL_HDR_PATH = $(objtree)/usr
1178
1179quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1180      cmd_headers_install = \
1181	mkdir -p $(INSTALL_HDR_PATH); \
1182	rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1183	usr/include $(INSTALL_HDR_PATH)
1184
1185PHONY += headers_install
1186headers_install: headers
1187	$(call cmd,headers_install)
1188
1189PHONY += archheaders archscripts
1190
1191hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1192
1193PHONY += headers
1194headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1195	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1196	  $(error Headers not exportable for the $(SRCARCH) architecture))
1197	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1198	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1199
1200# Deprecated. It is no-op now.
1201PHONY += headers_check
1202headers_check:
1203	@:
1204
1205ifdef CONFIG_HEADERS_INSTALL
1206prepare: headers
1207endif
1208
1209PHONY += scripts_unifdef
1210scripts_unifdef: scripts_basic
1211	$(Q)$(MAKE) $(build)=scripts scripts/unifdef
1212
1213# ---------------------------------------------------------------------------
1214# Kernel selftest
1215
1216PHONY += kselftest
1217kselftest:
1218	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1219
1220kselftest-%: FORCE
1221	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1222
1223PHONY += kselftest-merge
1224kselftest-merge:
1225	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1226	$(Q)find $(srctree)/tools/testing/selftests -name config | \
1227		xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1228	$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1229
1230# ---------------------------------------------------------------------------
1231# Devicetree files
1232
1233ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1234dtstree := arch/$(SRCARCH)/boot/dts
1235endif
1236
1237ifneq ($(dtstree),)
1238
1239%.dtb: include/config/kernel.release scripts_dtc
1240	$(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1241
1242PHONY += dtbs dtbs_install dtbs_check
1243dtbs dtbs_check: include/config/kernel.release scripts_dtc
1244	$(Q)$(MAKE) $(build)=$(dtstree)
1245
1246dtbs_check: export CHECK_DTBS=1
1247dtbs_check: dt_binding_check
1248
1249dtbs_install:
1250	$(Q)$(MAKE) $(dtbinst)=$(dtstree)
1251
1252ifdef CONFIG_OF_EARLY_FLATTREE
1253all: dtbs
1254endif
1255
1256endif
1257
1258PHONY += scripts_dtc
1259scripts_dtc: scripts_basic
1260	$(Q)$(MAKE) $(build)=scripts/dtc
1261
1262PHONY += dt_binding_check
1263dt_binding_check: scripts_dtc
1264	$(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1265
1266# ---------------------------------------------------------------------------
1267# Modules
1268
1269ifdef CONFIG_MODULES
1270
1271# By default, build modules as well
1272
1273all: modules
1274
1275# Build modules
1276#
1277# A module can be listed more than once in obj-m resulting in
1278# duplicate lines in modules.order files.  Those are removed
1279# using awk while concatenating to the final file.
1280
1281PHONY += modules
1282modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1283	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1284	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1285
1286modules.order: descend
1287	$(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1288
1289# Target to prepare building external modules
1290PHONY += modules_prepare
1291modules_prepare: prepare
1292
1293# Target to install modules
1294PHONY += modules_install
1295modules_install: _modinst_ _modinst_post
1296
1297PHONY += _modinst_
1298_modinst_:
1299	@rm -rf $(MODLIB)/kernel
1300	@rm -f $(MODLIB)/source
1301	@mkdir -p $(MODLIB)/kernel
1302	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1303	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1304		rm -f $(MODLIB)/build ; \
1305		ln -s $(CURDIR) $(MODLIB)/build ; \
1306	fi
1307	@sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1308	@cp -f modules.builtin $(MODLIB)/
1309	@cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1310	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1311
1312# This depmod is only for convenience to give the initial
1313# boot a modules.dep even before / is mounted read-write.  However the
1314# boot script depmod is the master version.
1315PHONY += _modinst_post
1316_modinst_post: _modinst_
1317	$(call cmd,depmod)
1318
1319ifeq ($(CONFIG_MODULE_SIG), y)
1320PHONY += modules_sign
1321modules_sign:
1322	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1323endif
1324
1325else # CONFIG_MODULES
1326
1327# Modules not configured
1328# ---------------------------------------------------------------------------
1329
1330PHONY += modules modules_install
1331modules modules_install:
1332	@echo >&2
1333	@echo >&2 "The present kernel configuration has modules disabled."
1334	@echo >&2 "Type 'make config' and enable loadable module support."
1335	@echo >&2 "Then build a kernel with module support enabled."
1336	@echo >&2
1337	@exit 1
1338
1339endif # CONFIG_MODULES
1340
1341###
1342# Cleaning is done on three levels.
1343# make clean     Delete most generated files
1344#                Leave enough to build external modules
1345# make mrproper  Delete the current configuration, and all generated files
1346# make distclean Remove editor backup files, patch leftover files and the like
1347
1348# Directories & files removed with 'make clean'
1349CLEAN_DIRS  += include/ksym
1350CLEAN_FILES += modules.builtin modules.builtin.modinfo modules.nsdeps
1351
1352# Directories & files removed with 'make mrproper'
1353MRPROPER_DIRS  += include/config include/generated          \
1354		  arch/$(SRCARCH)/include/generated .tmp_objdiff \
1355		  debian/ snap/ tar-install/
1356MRPROPER_FILES += .config .config.old .version \
1357		  Module.symvers \
1358		  signing_key.pem signing_key.priv signing_key.x509	\
1359		  x509.genkey extra_certificates signing_key.x509.keyid	\
1360		  signing_key.x509.signer vmlinux-gdb.py \
1361		  *.spec
1362
1363# Directories & files removed with 'make distclean'
1364DISTCLEAN_DIRS  +=
1365DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1366
1367# clean - Delete most, but leave enough to build external modules
1368#
1369clean: rm-dirs  := $(CLEAN_DIRS)
1370clean: rm-files := $(CLEAN_FILES)
1371
1372PHONY += archclean vmlinuxclean
1373
1374vmlinuxclean:
1375	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1376	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1377
1378clean: archclean vmlinuxclean
1379
1380# mrproper - Delete all generated files, including .config
1381#
1382mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1383mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1384mrproper-dirs      := $(addprefix _mrproper_,scripts)
1385
1386PHONY += $(mrproper-dirs) mrproper
1387$(mrproper-dirs):
1388	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1389
1390mrproper: clean $(mrproper-dirs)
1391	$(call cmd,rmdirs)
1392	$(call cmd,rmfiles)
1393
1394# distclean
1395#
1396distclean: rm-dirs  := $(wildcard $(DISTCLEAN_DIRS))
1397distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1398
1399PHONY += distclean
1400
1401distclean: mrproper
1402	$(call cmd,rmdirs)
1403	$(call cmd,rmfiles)
1404	@find $(srctree) $(RCS_FIND_IGNORE) \
1405		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1406		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1407		-o -name 'core' \) \
1408		-type f -print | xargs rm -f
1409
1410
1411# Packaging of the kernel to various formats
1412# ---------------------------------------------------------------------------
1413
1414%src-pkg: FORCE
1415	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1416%pkg: include/config/kernel.release FORCE
1417	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1418
1419# Brief documentation of the typical targets used
1420# ---------------------------------------------------------------------------
1421
1422boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1423boards := $(sort $(notdir $(boards)))
1424board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1425board-dirs := $(sort $(notdir $(board-dirs:/=)))
1426
1427PHONY += help
1428help:
1429	@echo  'Cleaning targets:'
1430	@echo  '  clean		  - Remove most generated files but keep the config and'
1431	@echo  '                    enough build support to build external modules'
1432	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1433	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1434	@echo  ''
1435	@echo  'Configuration targets:'
1436	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1437	@echo  ''
1438	@echo  'Other generic targets:'
1439	@echo  '  all		  - Build all targets marked with [*]'
1440	@echo  '* vmlinux	  - Build the bare kernel'
1441	@echo  '* modules	  - Build all modules'
1442	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1443	@echo  '  dir/            - Build all files in dir and below'
1444	@echo  '  dir/file.[ois]  - Build specified target only'
1445	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1446	@echo  '                    (requires compiler support for LLVM assembly generation)'
1447	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1448	@echo  '                    (requires a recent binutils and recent build (System.map))'
1449	@echo  '  dir/file.ko     - Build module including final link'
1450	@echo  '  modules_prepare - Set up for building external modules'
1451	@echo  '  tags/TAGS	  - Generate tags file for editors'
1452	@echo  '  cscope	  - Generate cscope index'
1453	@echo  '  gtags           - Generate GNU GLOBAL index'
1454	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1455	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1456	@echo  '  image_name	  - Output the image name (use with make -s)'
1457	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1458	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1459	 echo  ''
1460	@echo  'Static analysers:'
1461	@echo  '  checkstack      - Generate a list of stack hogs'
1462	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1463	@echo  '  versioncheck    - Sanity check on version.h usage'
1464	@echo  '  includecheck    - Check for duplicate included header files'
1465	@echo  '  export_report   - List the usages of all exported symbols'
1466	@echo  '  headerdep       - Detect inclusion cycles in headers'
1467	@echo  '  coccicheck      - Check with Coccinelle'
1468	@echo  ''
1469	@echo  'Tools:'
1470	@echo  '  nsdeps          - Generate missing symbol namespace dependencies'
1471	@echo  ''
1472	@echo  'Kernel selftest:'
1473	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1474	@echo  '                    Build, install, and boot kernel before'
1475	@echo  '                    running kselftest on it'
1476	@echo  '  kselftest-clean - Remove all generated kselftest files'
1477	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1478	@echo  '                    .config.'
1479	@echo  ''
1480	@$(if $(dtstree), \
1481		echo 'Devicetree:'; \
1482		echo '* dtbs             - Build device tree blobs for enabled boards'; \
1483		echo '  dtbs_install     - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1484		echo '  dt_binding_check - Validate device tree binding documents'; \
1485		echo '  dtbs_check       - Validate device tree source files';\
1486		echo '')
1487
1488	@echo 'Userspace tools targets:'
1489	@echo '  use "make tools/help"'
1490	@echo '  or  "cd tools; make help"'
1491	@echo  ''
1492	@echo  'Kernel packaging:'
1493	@$(MAKE) -f $(srctree)/scripts/Makefile.package help
1494	@echo  ''
1495	@echo  'Documentation targets:'
1496	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1497	@echo  ''
1498	@echo  'Architecture specific targets ($(SRCARCH)):'
1499	@$(if $(archhelp),$(archhelp),\
1500		echo '  No architecture specific help defined for $(SRCARCH)')
1501	@echo  ''
1502	@$(if $(boards), \
1503		$(foreach b, $(boards), \
1504		printf "  %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1505		echo '')
1506	@$(if $(board-dirs), \
1507		$(foreach b, $(board-dirs), \
1508		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1509		printf "  %-16s - Show all of the above\\n" help-boards; \
1510		echo '')
1511
1512	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1513	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1514	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1515	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK'
1516	@echo  '                       (sparse by default)'
1517	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1518	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1519	@echo  '  make W=n   [targets] Enable extra build checks, n=1,2,3 where'
1520	@echo  '		1: warnings which may be relevant and do not occur too often'
1521	@echo  '		2: warnings which occur quite often but may still be relevant'
1522	@echo  '		3: more obscure warnings, can most likely be ignored'
1523	@echo  '		Multiple levels can be combined with W=12 or W=123'
1524	@echo  ''
1525	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1526	@echo  'For further info see the ./README file'
1527
1528
1529help-board-dirs := $(addprefix help-,$(board-dirs))
1530
1531help-boards: $(help-board-dirs)
1532
1533boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1534
1535$(help-board-dirs): help-%:
1536	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1537	@$(if $(boards-per-dir), \
1538		$(foreach b, $(boards-per-dir), \
1539		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1540		echo '')
1541
1542
1543# Documentation targets
1544# ---------------------------------------------------------------------------
1545DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1546	       linkcheckdocs dochelp refcheckdocs
1547PHONY += $(DOC_TARGETS)
1548$(DOC_TARGETS):
1549	$(Q)$(MAKE) $(build)=Documentation $@
1550
1551# Misc
1552# ---------------------------------------------------------------------------
1553
1554PHONY += scripts_gdb
1555scripts_gdb: prepare0
1556	$(Q)$(MAKE) $(build)=scripts/gdb
1557	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1558
1559ifdef CONFIG_GDB_SCRIPTS
1560all: scripts_gdb
1561endif
1562
1563else # KBUILD_EXTMOD
1564
1565###
1566# External module support.
1567# When building external modules the kernel used as basis is considered
1568# read-only, and no consistency checks are made and the make
1569# system is not used on the basis kernel. If updates are required
1570# in the basis kernel ordinary make commands (without M=...) must
1571# be used.
1572#
1573# The following are the only valid targets when building external
1574# modules.
1575# make M=dir clean     Delete all automatically generated files
1576# make M=dir modules   Make all modules in specified dir
1577# make M=dir	       Same as 'make M=dir modules'
1578# make M=dir modules_install
1579#                      Install the modules built in the module directory
1580#                      Assumes install directory is already created
1581
1582# We are always building modules
1583KBUILD_MODULES := 1
1584
1585PHONY += $(objtree)/Module.symvers
1586$(objtree)/Module.symvers:
1587	@test -e $(objtree)/Module.symvers || ( \
1588	echo; \
1589	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1590	echo "           is missing; modules will have no dependencies and modversions."; \
1591	echo )
1592
1593build-dirs := $(KBUILD_EXTMOD)
1594PHONY += modules
1595modules: descend $(objtree)/Module.symvers
1596	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1597
1598PHONY += modules_install
1599modules_install: _emodinst_ _emodinst_post
1600
1601install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1602PHONY += _emodinst_
1603_emodinst_:
1604	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1605	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1606
1607PHONY += _emodinst_post
1608_emodinst_post: _emodinst_
1609	$(call cmd,depmod)
1610
1611clean-dirs := $(KBUILD_EXTMOD)
1612clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1613
1614PHONY += /
1615/:
1616	@echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1617
1618PHONY += help
1619help:
1620	@echo  '  Building external modules.'
1621	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1622	@echo  ''
1623	@echo  '  modules         - default target, build the module(s)'
1624	@echo  '  modules_install - install the module'
1625	@echo  '  clean           - remove generated files in module directory only'
1626	@echo  ''
1627
1628PHONY += prepare
1629endif # KBUILD_EXTMOD
1630
1631# Single targets
1632# ---------------------------------------------------------------------------
1633# To build individual files in subdirectories, you can do like this:
1634#
1635#   make foo/bar/baz.s
1636#
1637# The supported suffixes for single-target are listed in 'single-targets'
1638#
1639# To build only under specific subdirectories, you can do like this:
1640#
1641#   make foo/bar/baz/
1642
1643ifdef single-build
1644
1645# .ko is special because modpost is needed
1646single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1647single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1648
1649$(single-ko): single_modpost
1650	@:
1651$(single-no-ko): descend
1652	@:
1653
1654ifeq ($(KBUILD_EXTMOD),)
1655# For the single build of in-tree modules, use a temporary file to avoid
1656# the situation of modules_install installing an invalid modules.order.
1657MODORDER := .modules.tmp
1658endif
1659
1660PHONY += single_modpost
1661single_modpost: $(single-no-ko)
1662	$(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1663	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1664
1665KBUILD_MODULES := 1
1666
1667export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1668
1669# trim unrelated directories
1670build-dirs := $(foreach d, $(build-dirs), \
1671			$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1672
1673endif
1674
1675# Handle descending into subdirectories listed in $(build-dirs)
1676# Preset locale variables to speed up the build process. Limit locale
1677# tweaks to this spot to avoid wrong language settings when running
1678# make menuconfig etc.
1679# Error messages still appears in the original language
1680PHONY += descend $(build-dirs)
1681descend: $(build-dirs)
1682$(build-dirs): prepare
1683	$(Q)$(MAKE) $(build)=$@ \
1684	single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1685	need-builtin=1 need-modorder=1
1686
1687clean-dirs := $(addprefix _clean_, $(clean-dirs))
1688PHONY += $(clean-dirs) clean
1689$(clean-dirs):
1690	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1691
1692clean: $(clean-dirs)
1693	$(call cmd,rmdirs)
1694	$(call cmd,rmfiles)
1695	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1696		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1697		-o -name '*.ko.*' \
1698		-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1699		-o -name '*.dwo' -o -name '*.lst' \
1700		-o -name '*.su' -o -name '*.mod' \
1701		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1702		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1703		-o -name '*.asn1.[ch]' \
1704		-o -name '*.symtypes' -o -name 'modules.order' \
1705		-o -name '.tmp_*.o.*' \
1706		-o -name '*.c.[012]*.*' \
1707		-o -name '*.ll' \
1708		-o -name '*.gcno' \) -type f -print | xargs rm -f
1709
1710# Generate tags for editors
1711# ---------------------------------------------------------------------------
1712quiet_cmd_tags = GEN     $@
1713      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1714
1715tags TAGS cscope gtags: FORCE
1716	$(call cmd,tags)
1717
1718# Script to generate missing namespace dependencies
1719# ---------------------------------------------------------------------------
1720
1721PHONY += nsdeps
1722nsdeps: export KBUILD_NSDEPS=1
1723nsdeps: modules
1724	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1725
1726# Scripts to check various things for consistency
1727# ---------------------------------------------------------------------------
1728
1729PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1730
1731includecheck:
1732	find $(srctree)/* $(RCS_FIND_IGNORE) \
1733		-name '*.[hcS]' -type f -print | sort \
1734		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1735
1736versioncheck:
1737	find $(srctree)/* $(RCS_FIND_IGNORE) \
1738		-name '*.[hcS]' -type f -print | sort \
1739		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1740
1741coccicheck:
1742	$(Q)$(BASH) $(srctree)/scripts/$@
1743
1744namespacecheck:
1745	$(PERL) $(srctree)/scripts/namespace.pl
1746
1747export_report:
1748	$(PERL) $(srctree)/scripts/export_report.pl
1749
1750PHONY += checkstack kernelrelease kernelversion image_name
1751
1752# UML needs a little special treatment here.  It wants to use the host
1753# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1754# else wants $(ARCH), including people doing cross-builds, which means
1755# that $(SUBARCH) doesn't work here.
1756ifeq ($(ARCH), um)
1757CHECKSTACK_ARCH := $(SUBARCH)
1758else
1759CHECKSTACK_ARCH := $(ARCH)
1760endif
1761checkstack:
1762	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1763	$(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1764
1765kernelrelease:
1766	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1767
1768kernelversion:
1769	@echo $(KERNELVERSION)
1770
1771image_name:
1772	@echo $(KBUILD_IMAGE)
1773
1774# Clear a bunch of variables before executing the submake
1775
1776ifeq ($(quiet),silent_)
1777tools_silent=s
1778endif
1779
1780tools/: FORCE
1781	$(Q)mkdir -p $(objtree)/tools
1782	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1783
1784tools/%: FORCE
1785	$(Q)mkdir -p $(objtree)/tools
1786	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1787
1788# FIXME Should go into a make.lib or something
1789# ===========================================================================
1790
1791quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1792      cmd_rmdirs = rm -rf $(rm-dirs)
1793
1794quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1795      cmd_rmfiles = rm -f $(rm-files)
1796
1797# Run depmod only if we have System.map and depmod is executable
1798quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1799      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1800                   $(KERNELRELEASE)
1801
1802# read saved command lines for existing targets
1803existing-targets := $(wildcard $(sort $(targets)))
1804
1805-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1806
1807endif # config-build
1808endif # mixed-build
1809endif # need-sub-make
1810
1811PHONY += FORCE
1812FORCE:
1813
1814# Declare the contents of the PHONY variable as phony.  We keep that
1815# information in a variable so we can use it in if_changed and friends.
1816.PHONY: $(PHONY)
1817