path: root/Makefile (plain)
blob: 0d023440311cfa646d23e8f31202e99d1463d16d

1	VERSION = 4
2	PATCHLEVEL = 9
3	SUBLEVEL = 180
4	EXTRAVERSION =
5	NAME = Roaring Lionus
6
7	# *DOCUMENTATION*
8	# To see a list of typical targets execute "make help"
9	# More info can be located in ./README
10	# Comments in this file are targeted only to the developer, do not
11	# expect to learn how to build the kernel reading this file.
12
13	# o Do not use make's built-in rules and variables
14	# (this increases performance and avoids hard-to-debug behaviour);
15	# o Look for make include files relative to root of kernel src
16	MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18	# Avoid funny character set dependencies
19	unexport LC_ALL
20	LC_COLLATE=C
21	LC_NUMERIC=C
22	export LC_COLLATE LC_NUMERIC
23
24	# Avoid interference with shell env settings
25	unexport GREP_OPTIONS
26
27	# We are using a recursive build, so we need to do a little thinking
28	# to get the ordering right.
29	#
30	# Most importantly: sub-Makefiles should only ever modify files in
31	# their own directory. If in some directory we have a dependency on
32	# a file in another dir (which doesn't happen often, but it's often
33	# unavoidable when linking the built-in.o targets which finally
34	# turn into vmlinux), we will call a sub make in that other dir, and
35	# after that we are sure that everything which is in that other dir
36	# is now up to date.
37	#
38	# The only cases where we need to modify files which have global
39	# effects are thus separated out and done before the recursive
40	# descending is started. They are now explicitly listed as the
41	# prepare rule.
42
43	# Beautify output
44	# ---------------------------------------------------------------------------
45	#
46	# Normally, we echo the whole command before executing it. By making
47	# that echo $($(quiet)$(cmd)), we now have the possibility to set
48	# $(quiet) to choose other forms of output instead, e.g.
49	#
50	# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51	# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52	#
53	# If $(quiet) is empty, the whole command will be printed.
54	# If it is set to "quiet_", only the short version will be printed.
55	# If it is set to "silent_", nothing will be printed at all, since
56	# the variable $(silent_cmd_cc_o_c) doesn't exist.
57	#
58	# A simple variant is to prefix commands with $(Q) - that's useful
59	# for commands that shall be hidden in non-verbose mode.
60	#
61	# $(Q)ln $@ :<
62	#
63	# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64	# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65	#
66	# To put more focus on warnings, be less verbose as default
67	# Use 'make V=1' to see the full commands
68
69	ifeq ("$(origin V)", "command line")
70	KBUILD_VERBOSE = $(V)
71	endif
72	ifndef KBUILD_VERBOSE
73	KBUILD_VERBOSE = 0
74	endif
75
76	ifeq ($(KBUILD_VERBOSE),1)
77	quiet =
78	Q =
79	else
80	quiet=quiet_
81	Q = @
82	endif
83
84	# If the user is running make -s (silent mode), suppress echoing of
85	# commands
86
87	ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88	ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89	quiet=silent_
90	tools_silent=s
91	endif
92	else # make-3.8x
93	ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94	quiet=silent_
95	tools_silent=-s
96	endif
97	endif
98
99	export quiet Q KBUILD_VERBOSE
100
101	# kbuild supports saving output files in a separate directory.
102	# To locate output files in a separate directory two syntaxes are supported.
103	# In both cases the working directory must be the root of the kernel src.
104	# 1) O=
105	# Use "make O=dir/to/store/output/files/"
106	#
107	# 2) Set KBUILD_OUTPUT
108	# Set the environment variable KBUILD_OUTPUT to point to the directory
109	# where the output files shall be placed.
110	# export KBUILD_OUTPUT=dir/to/store/output/files/
111	# make
112	#
113	# The O= assignment takes precedence over the KBUILD_OUTPUT environment
114	# variable.
115
116	# KBUILD_SRC is set on invocation of make in OBJ directory
117	# KBUILD_SRC is not intended to be used by the regular user (for now)
118	ifeq ($(KBUILD_SRC),)
119
120	# OK, Make called in directory where kernel src resides
121	# Do we want to locate output files in a separate directory?
122	ifeq ("$(origin O)", "command line")
123	KBUILD_OUTPUT := $(O)
124	endif
125
126	# That's our default target when none is given on the command line
127	PHONY := _all
128	_all:
129
130	# Cancel implicit rules on top Makefile
131	$(CURDIR)/Makefile Makefile: ;
132
133	ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134	$(error main directory cannot contain spaces nor colons)
135	endif
136
137	ifneq ($(KBUILD_OUTPUT),)
138	# Invoke a second make in the output directory, passing relevant variables
139	# check that the output directory actually exists
140	saved-output := $(KBUILD_OUTPUT)
141	KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
142	&& /bin/pwd)
143	$(if $(KBUILD_OUTPUT),, \
144	$(error failed to create output directory "$(saved-output)"))
145
146	PHONY += $(MAKECMDGOALS) sub-make
147
148	$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
149	@:
150
151	sub-make:
152	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
153	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
154
155	# Leave processing to above invocation of make
156	skip-makefile := 1
157	endif # ifneq ($(KBUILD_OUTPUT),)
158	endif # ifeq ($(KBUILD_SRC),)
159
160	# We process the rest of the Makefile if this is the final invocation of make
161	ifeq ($(skip-makefile),)
162
163	# Do not print "Entering directory ...",
164	# but we want to display it when entering to the output directory
165	# so that IDEs/editors are able to understand relative filenames.
166	MAKEFLAGS += --no-print-directory
167
168	# Call a source code checker (by default, "sparse") as part of the
169	# C compilation.
170	#
171	# Use 'make C=1' to enable checking of only re-compiled files.
172	# Use 'make C=2' to enable checking of *all* source files, regardless
173	# of whether they are re-compiled or not.
174	#
175	# See the file "Documentation/sparse.txt" for more details, including
176	# where to get the "sparse" utility.
177
178	ifeq ("$(origin C)", "command line")
179	KBUILD_CHECKSRC = $(C)
180	endif
181	ifndef KBUILD_CHECKSRC
182	KBUILD_CHECKSRC = 0
183	endif
184
185	# Use make M=dir to specify directory of external module to build
186	# Old syntax make ... SUBDIRS=$PWD is still supported
187	# Setting the environment variable KBUILD_EXTMOD take precedence
188	ifdef SUBDIRS
189	KBUILD_EXTMOD ?= $(SUBDIRS)
190	endif
191
192	ifeq ("$(origin M)", "command line")
193	KBUILD_EXTMOD := $(M)
194	endif
195
196	# If building an external module we do not care about the all: rule
197	# but instead _all depend on modules
198	PHONY += all
199	ifeq ($(KBUILD_EXTMOD),)
200	_all: all
201	else
202	_all: modules
203	endif
204
205	ifeq ($(KBUILD_SRC),)
206	# building in the source tree
207	srctree := .
208	else
209	ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210	# building in a subdirectory of the source tree
211	srctree := ..
212	else
213	srctree := $(KBUILD_SRC)
214	endif
215	endif
216	objtree := .
217	src := $(srctree)
218	obj := $(objtree)
219
220	VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
221
222	export srctree objtree VPATH
223
224	# SUBARCH tells the usermode build what the underlying arch is. That is set
225	# first, and if a usermode build is happening, the "ARCH=um" on the command
226	# line overrides the setting of ARCH below. If a native build is happening,
227	# then ARCH is assigned, getting whatever value it gets normally, and
228	# SUBARCH is subsequently ignored.
229
230	SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231	-e s/sun4u/sparc64/ \
232	-e s/arm.*/arm/ -e s/sa110/arm/ \
233	-e s/s390x/s390/ -e s/parisc64/parisc/ \
234	-e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235	-e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
236
237	# Cross compiling and selecting different set of gcc/bin-utils
238	# ---------------------------------------------------------------------------
239	#
240	# When performing cross compilation for other architectures ARCH shall be set
241	# to the target architecture. (See arch/* for the possibilities).
242	# ARCH can be set during invocation of make:
243	# make ARCH=ia64
244	# Another way is to have ARCH set in the environment.
245	# The default ARCH is the host where make is executed.
246
247	# CROSS_COMPILE specify the prefix used for all executables used
248	# during compilation. Only gcc and related bin-utils executables
249	# are prefixed with $(CROSS_COMPILE).
250	# CROSS_COMPILE can be set on the command line
251	# make CROSS_COMPILE=ia64-linux-
252	# Alternatively CROSS_COMPILE can be set in the environment.
253	# A third alternative is to store a setting in .config so that plain
254	# "make" in the configured kernel build directory always uses that.
255	# Default value for CROSS_COMPILE is not to prefix executables
256	# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
257	ARCH ?= $(SUBARCH)
258	CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
259
260	# Architecture as present in compile.h
261	UTS_MACHINE := $(ARCH)
262	SRCARCH := $(ARCH)
263
264	# Additional ARCH settings for x86
265	ifeq ($(ARCH),i386)
266	SRCARCH := x86
267	endif
268	ifeq ($(ARCH),x86_64)
269	SRCARCH := x86
270	endif
271
272	# Additional ARCH settings for sparc
273	ifeq ($(ARCH),sparc32)
274	SRCARCH := sparc
275	endif
276	ifeq ($(ARCH),sparc64)
277	SRCARCH := sparc
278	endif
279
280	# Additional ARCH settings for sh
281	ifeq ($(ARCH),sh64)
282	SRCARCH := sh
283	endif
284
285	# Additional ARCH settings for tile
286	ifeq ($(ARCH),tilepro)
287	SRCARCH := tile
288	endif
289	ifeq ($(ARCH),tilegx)
290	SRCARCH := tile
291	endif
292
293	# Where to locate arch specific headers
294	hdr-arch := $(SRCARCH)
295
296	KCONFIG_CONFIG ?= .config
297	export KCONFIG_CONFIG
298
299	# SHELL used by kbuild
300	CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301	else if [ -x /bin/bash ]; then echo /bin/bash; \
302	else echo sh; fi ; fi)
303
304	HOSTCC = gcc
305	HOSTCXX = g++
306	HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
307	HOSTCXXFLAGS = -O2
308
309	# Decide whether to build built-in, modular, or both.
310	# Normally, just do built-in.
311
312	KBUILD_MODULES :=
313	KBUILD_BUILTIN := 1
314
315	# If we have only "make modules", don't compile built-in objects.
316	# When we're building modules with modversions, we need to consider
317	# the built-in objects during the descend as well, in order to
318	# make sure the checksums are up to date before we record them.
319
320	ifeq ($(MAKECMDGOALS),modules)
321	KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
322	endif
323
324	# If we have "make <whatever> modules", compile modules
325	# in addition to whatever we do anyway.
326	# Just "make" or "make all" shall build modules as well
327
328	ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
329	KBUILD_MODULES := 1
330	endif
331
332	ifeq ($(MAKECMDGOALS),)
333	KBUILD_MODULES := 1
334	endif
335
336	export KBUILD_MODULES KBUILD_BUILTIN
337	export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
338
339	# We need some generic definitions (do not try to remake the file).
340	scripts/Kbuild.include: ;
341	include scripts/Kbuild.include
342
343	# Make variables (CC, etc...)
344	AS = $(CROSS_COMPILE)as
345	LD = $(CROSS_COMPILE)ld
346	LDGOLD = $(CROSS_COMPILE)ld.gold
347	CC = $(CROSS_COMPILE)gcc
348	CPP = $(CC) -E
349	AR = $(CROSS_COMPILE)ar
350	NM = $(CROSS_COMPILE)nm
351	STRIP = $(CROSS_COMPILE)strip
352	OBJCOPY = $(CROSS_COMPILE)objcopy
353	OBJDUMP = $(CROSS_COMPILE)objdump
354	AWK = awk
355	GENKSYMS = scripts/genksyms/genksyms
356	INSTALLKERNEL := installkernel
357	DEPMOD = /sbin/depmod
358	PERL = perl
359	PYTHON = python
360	CHECK = sparse
361
362	CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
363	-Wbitwise -Wno-return-void $(CF)
364	NOSTDINC_FLAGS =
365	CFLAGS_MODULE =
366	AFLAGS_MODULE =
367	LDFLAGS_MODULE =
368	CFLAGS_KERNEL =
369	AFLAGS_KERNEL =
370	LDFLAGS_vmlinux =
371
372	# Use USERINCLUDE when you must reference the UAPI directories only.
373	USERINCLUDE := \
374	-I$(srctree)/arch/$(hdr-arch)/include/uapi \
375	-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
376	-I$(srctree)/include/uapi \
377	-I$(objtree)/include/generated/uapi \
378	-include $(srctree)/include/linux/kconfig.h
379
380	# Use LINUXINCLUDE when you must reference the include/ directory.
381	# Needed to be compatible with the O= option
382	LINUXINCLUDE := \
383	-I$(srctree)/arch/$(hdr-arch)/include \
384	-I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
385	-I$(objtree)/arch/$(hdr-arch)/include/generated \
386	$(if $(KBUILD_SRC), -I$(srctree)/include) \
387	-I$(objtree)/include
388
389	LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
390
391	KBUILD_AFLAGS := -D__ASSEMBLY__
392	KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
393	-fno-strict-aliasing -fno-common -fshort-wchar \
394	-Werror-implicit-function-declaration \
395	-Wno-format-security \
396	-Werror \
397	-std=gnu89 $(call cc-option,-fno-PIE)
398
399
400	KBUILD_CPPFLAGS := -D__KERNEL__
401	KBUILD_AFLAGS_KERNEL :=
402	KBUILD_CFLAGS_KERNEL :=
403	KBUILD_AFLAGS_MODULE := -DMODULE
404	KBUILD_CFLAGS_MODULE := -DMODULE
405	KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
406	GCC_PLUGINS_CFLAGS :=
407
408	# Read KERNELRELEASE from include/config/kernel.release (if it exists)
409	KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
410	KERNELRELEASE_FULL = $(shell cat include/config/kernel.release_full 2> /dev/null)
411	KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
412
413	export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
414	export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
415	export CPP AR NM STRIP OBJCOPY OBJDUMP
416	export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
417	export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
418
419	export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
420	export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
421	export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
422	export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
423	export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
424	export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
425	export KBUILD_ARFLAGS
426
427	# When compiling out-of-tree modules, put MODVERDIR in the module
428	# tree rather than in the kernel tree. The kernel tree might
429	# even be read-only.
430	export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
431
432	# Files to ignore in find ... statements
433
434	export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
435	-name CVS -o -name .pc -o -name .hg -o -name .git \) \
436	-prune -o
437	export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
438	--exclude CVS --exclude .pc --exclude .hg --exclude .git
439
440	# ===========================================================================
441	# Rules shared between *config targets and build targets
442
443	# Basic helpers built in scripts/
444	PHONY += scripts_basic
445	scripts_basic:
446	$(Q)$(MAKE) $(build)=scripts/basic
447	$(Q)rm -f .tmp_quiet_recordmcount
448	$(Q)mkdir -p $(srctree)/.git/hooks
449	$(Q)cp $(srctree)/scripts/amlogic/pre-commit $(srctree)/.git/hooks/pre-commit
450	$(Q)chmod +x $(srctree)/.git/hooks/pre-commit
451
452	# To avoid any implicit rule to kick in, define an empty command.
453	scripts/basic/%: scripts_basic ;
454
455	PHONY += outputmakefile
456	# outputmakefile generates a Makefile in the output directory, if using a
457	# separate output directory. This allows convenient use of make in the
458	# output directory.
459	outputmakefile:
460	ifneq ($(KBUILD_SRC),)
461	$(Q)ln -fsn $(srctree) source
462	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463	$(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464	endif
465
466	# Support for using generic headers in asm-generic
467	PHONY += asm-generic
468	asm-generic:
469	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470	src=asm obj=arch/$(SRCARCH)/include/generated/asm
471	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472	src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
473
474	# To make sure we do not include .config for any of the *config targets
475	# catch them early, and hand them over to scripts/kconfig/Makefile
476	# It is allowed to specify more targets when calling make, including
477	# mixing *config targets and build targets.
478	# For example 'make oldconfig all'.
479	# Detect when mixed targets is specified, and make a second invocation
480	# of make so .config is not included in this case either (for *config).
481
482	version_h := include/generated/uapi/linux/version.h
483	old_version_h := include/linux/version.h
484
485	no-dot-config-targets := clean mrproper distclean \
486	cscope gtags TAGS tags help% %docs check% coccicheck \
487	$(version_h) headers_% archheaders archscripts \
488	kernelversion %src-pkg
489
490	config-targets := 0
491	mixed-targets := 0
492	dot-config := 1
493
494	ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496	dot-config := 0
497	endif
498	endif
499
500	ifeq ($(KBUILD_EXTMOD),)
501	ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502	config-targets := 1
503	ifneq ($(words $(MAKECMDGOALS)),1)
504	mixed-targets := 1
505	endif
506	endif
507	endif
508	# install and module_install need also be processed one by one
509	ifneq ($(filter install,$(MAKECMDGOALS)),)
510	ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
511	mixed-targets := 1
512	endif
513	endif
514
515	ifeq ($(cc-name),clang)
516	ifneq ($(CROSS_COMPILE),)
517	CLANG_TRIPLE ?= $(CROSS_COMPILE)
518	CLANG_FLAGS := --target=$(notdir $(CLANG_TRIPLE:%-=%))
519	ifeq ($(shell $(srctree)/scripts/clang-android.sh $(CC) $(CLANG_FLAGS)), y)
520	$(error "Clang with Android --target detected. Did you specify CLANG_TRIPLE?")
521	endif
522	GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
523	CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
524	GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
525	endif
526	ifneq ($(GCC_TOOLCHAIN),)
527	CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
528	endif
529	CLANG_FLAGS += -no-integrated-as
530	KBUILD_CFLAGS += $(CLANG_FLAGS)
531	KBUILD_AFLAGS += $(CLANG_FLAGS)
532	endif
533
534
535	ifeq ($(mixed-targets),1)
536	# ===========================================================================
537	# We're called with mixed targets (*config and build targets).
538	# Handle them one by one.
539
540	PHONY += $(MAKECMDGOALS) __build_one_by_one
541
542	$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
543	@:
544
545	__build_one_by_one:
546	$(Q)set -e; \
547	for i in $(MAKECMDGOALS); do \
548	$(MAKE) -f $(srctree)/Makefile $$i; \
549	done
550
551	else
552	ifeq ($(config-targets),1)
553	# ===========================================================================
554	# *config targets only - make sure prerequisites are updated, and descend
555	# in scripts/kconfig to make the *config target
556
557	# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
558	# KBUILD_DEFCONFIG may point out an alternative default configuration
559	# used for 'make defconfig'
560	include arch/$(SRCARCH)/Makefile
561	export KBUILD_DEFCONFIG KBUILD_KCONFIG
562
563	config: scripts_basic outputmakefile FORCE
564	$(Q)$(MAKE) $(build)=scripts/kconfig $@
565
566	%config: scripts_basic outputmakefile FORCE
567	$(Q)$(MAKE) $(build)=scripts/kconfig $@
568
569	else
570	# ===========================================================================
571	# Build targets only - this includes vmlinux, arch specific targets, clean
572	# targets and others. In general all targets except *config targets.
573
574	ifeq ($(KBUILD_EXTMOD),)
575	# Additional helpers built in scripts/
576	# Carefully list dependencies so we do not try to build scripts twice
577	# in parallel
578	PHONY += scripts
579	scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
580	asm-generic gcc-plugins
581	$(Q)$(MAKE) $(build)=$(@)
582
583	# Objects we will link into vmlinux / subdirs we need to visit
584	init-y := init/
585	drivers-y := drivers/ sound/ firmware/
586	net-y := net/
587	libs-y := lib/
588	core-y := usr/
589	virt-y := virt/
590	endif # KBUILD_EXTMOD
591
592	ifeq ($(dot-config),1)
593	# Read in config
594	-include include/config/auto.conf
595
596	ifeq ($(KBUILD_EXTMOD),)
597	# Read in dependencies to all Kconfig* files, make sure to run
598	# oldconfig if changes are detected.
599	-include include/config/auto.conf.cmd
600
601	# To avoid any implicit rule to kick in, define an empty command
602	$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
603
604	# If .config is newer than include/config/auto.conf, someone tinkered
605	# with it and forgot to run make oldconfig.
606	# if auto.conf.cmd is missing then we are probably in a cleaned tree so
607	# we execute the config step to be sure to catch updated Kconfig files
608	include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
609	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
610	else
611	# external modules needs include/generated/autoconf.h and include/config/auto.conf
612	# but do not care if they are up-to-date. Use auto.conf to trigger the test
613	PHONY += include/config/auto.conf
614
615	include/config/auto.conf:
616	$(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
617	echo >&2; \
618	echo >&2 " ERROR: Kernel configuration is invalid."; \
619	echo >&2 " include/generated/autoconf.h or $@ are missing.";\
620	echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
621	echo >&2 ; \
622	/bin/false)
623
624	endif # KBUILD_EXTMOD
625
626	else
627	# Dummy target needed, because used as prerequisite
628	include/config/auto.conf: ;
629	endif # $(dot-config)
630
631	# For the kernel to actually contain only the needed exported symbols,
632	# we have to build modules as well to determine what those symbols are.
633	# (this can be evaluated only once include/config/auto.conf has been included)
634	ifdef CONFIG_TRIM_UNUSED_KSYMS
635	KBUILD_MODULES := 1
636	endif
637
638	# The all: target is the default when no target is given on the
639	# command line.
640	# This allow a user to issue only 'make' to build a kernel including modules
641	# Defaults to vmlinux, but the arch makefile usually adds further targets
642	all: vmlinux
643
644	KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
645	KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
646	CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
647	$(call cc-option,-fno-tree-loop-im) \
648	$(call cc-disable-warning,maybe-uninitialized,)
649	CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
650	export CFLAGS_GCOV CFLAGS_KCOV
651
652	# Make toolchain changes before including arch/$(SRCARCH)/Makefile to ensure
653	# ar/cc/ld-* macros return correct values.
654	ifdef CONFIG_LTO_CLANG
655	# use GNU gold with LLVMgold for LTO linking, and LD for vmlinux_link
656	LDFINAL_vmlinux := $(LD)
657	LD := $(LDGOLD)
658	LDFLAGS += -plugin LLVMgold.so
659	# use llvm-ar for building symbol tables from IR files, and llvm-dis instead
660	# of objdump for processing symbol versions and exports
661	LLVM_AR := llvm-ar
662	LLVM_DIS := llvm-dis
663	export LLVM_AR LLVM_DIS
664	endif
665
666	# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
667	# values of the respective KBUILD_* variables
668	ARCH_CPPFLAGS :=
669	ARCH_AFLAGS :=
670	ARCH_CFLAGS :=
671	include arch/$(SRCARCH)/Makefile
672
673	KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
674	KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
675	KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
676	KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
677	KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
678	KBUILD_CFLAGS += $(call cc-disable-warning, attribute-alias)
679
680	ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
681	KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
682	KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
683	endif
684
685	ifdef CONFIG_LTO_CLANG
686	lto-clang-flags := -flto -fvisibility=hidden
687
688	# allow disabling only clang LTO where needed
689	DISABLE_LTO_CLANG := -fno-lto -fvisibility=default
690	export DISABLE_LTO_CLANG
691	endif
692
693	ifdef CONFIG_LTO
694	lto-flags := $(lto-clang-flags)
695	KBUILD_CFLAGS += $(lto-flags)
696
697	DISABLE_LTO := $(DISABLE_LTO_CLANG)
698	export DISABLE_LTO
699
700	# LDFINAL_vmlinux and LDFLAGS_FINAL_vmlinux can be set to override
701	# the linker and flags for vmlinux_link.
702	export LDFINAL_vmlinux LDFLAGS_FINAL_vmlinux
703	endif
704
705	ifdef CONFIG_CFI_CLANG
706	cfi-clang-flags += -fsanitize=cfi $(call cc-option, -fsplit-lto-unit)
707	DISABLE_CFI_CLANG := -fno-sanitize=cfi
708	ifdef CONFIG_MODULES
709	cfi-clang-flags += -fsanitize-cfi-cross-dso
710	DISABLE_CFI_CLANG += -fno-sanitize-cfi-cross-dso
711	endif
712	ifdef CONFIG_CFI_PERMISSIVE
713	cfi-clang-flags += -fsanitize-recover=cfi -fno-sanitize-trap=cfi
714	endif
715
716	# also disable CFI when LTO is disabled
717	DISABLE_LTO_CLANG += $(DISABLE_CFI_CLANG)
718	# allow disabling only clang CFI where needed
719	export DISABLE_CFI_CLANG
720	endif
721
722	ifdef CONFIG_CFI
723	# cfi-flags are re-tested in prepare-compiler-check
724	cfi-flags := $(cfi-clang-flags)
725	KBUILD_CFLAGS += $(cfi-flags)
726
727	DISABLE_CFI := $(DISABLE_CFI_CLANG)
728	DISABLE_LTO += $(DISABLE_CFI)
729	export DISABLE_CFI
730	endif
731
732	ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
733	KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
734	else
735	ifdef CONFIG_PROFILE_ALL_BRANCHES
736	KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
737	else
738	KBUILD_CFLAGS += -O2
739	endif
740	endif
741
742	KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
743	$(call cc-disable-warning,maybe-uninitialized,))
744
745	# Tell gcc to never replace conditional load with a non-conditional one
746	KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
747
748	# check for 'asm goto'
749	ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
750	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
751	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
752	endif
753
754	include scripts/Makefile.gcc-plugins
755
756	ifdef CONFIG_READABLE_ASM
757	# Disable optimizations that make assembler listings hard to read.
758	# reorder blocks reorders the control in the function
759	# ipa clone creates specialized cloned functions
760	# partial inlining inlines only parts of functions
761	KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
762	$(call cc-option,-fno-ipa-cp-clone,) \
763	$(call cc-option,-fno-partial-inlining)
764	endif
765
766	ifneq ($(CONFIG_FRAME_WARN),0)
767	KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
768	endif
769
770	# This selects the stack protector compiler flag. Testing it is delayed
771	# until after .config has been reprocessed, in the prepare-compiler-check
772	# target.
773	ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
774	stackp-flag := -fstack-protector
775	stackp-name := REGULAR
776	else
777	ifdef CONFIG_CC_STACKPROTECTOR_STRONG_AMLOGIC
778	stackp-flag := -fstack-protector-strong
779	stackp-name := STRONG
780	else
781	# Force off for distro compilers that enable stack protector by default.
782	stackp-flag := $(call cc-option, -fno-stack-protector)
783	endif
784	endif
785	# Find arch-specific stack protector compiler sanity-checking script.
786	ifdef CONFIG_CC_STACKPROTECTOR
787	stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
788	stackp-check := $(wildcard $(stackp-path))
789	endif
790	KBUILD_CFLAGS += $(stackp-flag)
791
792	ifeq ($(cc-name),clang)
793	KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
794	KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
795	KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
796	KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
797	KBUILD_CFLAGS += $(call cc-disable-warning, duplicate-decl-specifier)
798	# Quiet clang warning: comparison of unsigned expression < 0 is always false
799	KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
800	# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
801	# source of a reference will be _MergedGlobals and not on of the whitelisted names.
802	# See modpost pattern 2
803	KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
804	KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
805	else
806
807	# These warnings generated too much noise in a regular build.
808	# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
809	KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
810	endif
811
812	KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
813	ifdef CONFIG_FRAME_POINTER
814	KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
815	else
816	# Some targets (ARM with Thumb2, for example), can't be built with frame
817	# pointers. For those, we don't have FUNCTION_TRACER automatically
818	# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
819	# incompatible with -fomit-frame-pointer with current GCC, so we don't use
820	# -fomit-frame-pointer with FUNCTION_TRACER.
821	ifndef CONFIG_FUNCTION_TRACER
822	KBUILD_CFLAGS += -fomit-frame-pointer
823	endif
824	endif
825
826	KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
827
828	ifdef CONFIG_DEBUG_INFO
829	ifdef CONFIG_DEBUG_INFO_SPLIT
830	KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
831	else
832	KBUILD_CFLAGS += -g
833	endif
834	KBUILD_AFLAGS += -Wa,-gdwarf-2
835	endif
836	ifdef CONFIG_DEBUG_INFO_DWARF4
837	KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
838	endif
839
840	ifdef CONFIG_DEBUG_INFO_REDUCED
841	KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
842	$(call cc-option,-fno-var-tracking)
843	endif
844
845	ifdef CONFIG_FUNCTION_TRACER
846	ifndef CC_FLAGS_FTRACE
847	CC_FLAGS_FTRACE := -pg
848	endif
849	export CC_FLAGS_FTRACE
850	ifdef CONFIG_HAVE_FENTRY
851	CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
852	endif
853	KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
854	KBUILD_AFLAGS += $(CC_USING_FENTRY)
855	ifdef CONFIG_DYNAMIC_FTRACE
856	ifdef CONFIG_HAVE_C_RECORDMCOUNT
857	BUILD_C_RECORDMCOUNT := y
858	export BUILD_C_RECORDMCOUNT
859	endif
860	endif
861	endif
862
863	# We trigger additional mismatches with less inlining
864	ifdef CONFIG_DEBUG_SECTION_MISMATCH
865	KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
866	endif
867
868	# arch Makefile may override CC so keep this after arch Makefile is included
869	NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
870	CHECKFLAGS += $(NOSTDINC_FLAGS)
871
872	# warn about C99 declaration after statement
873	KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
874
875	# disable pointer signed / unsigned warnings in gcc 4.0
876	KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
877
878	# disable stringop warnings in gcc 8+
879	KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
880
881	# disable invalid "can't wrap" optimizations for signed / pointers
882	KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
883
884	# clang sets -fmerge-all-constants by default as optimization, but this
885	# is non-conforming behavior for C and in fact breaks the kernel, so we
886	# need to disable it here generally.
887	KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
888
889	# for gcc -fno-merge-all-constants disables everything, but it is fine
890	# to have actual conforming behavior enabled.
891	KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
892
893	# Make sure -fstack-check isn't enabled (like gentoo apparently did)
894	KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
895
896	# conserve stack if available
897	KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
898
899	# disallow errors like 'EXPORT_GPL(foo);' with missing header
900	KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
901
902	# require functions to have arguments in prototypes, not empty 'int foo()'
903	KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
904
905	# Prohibit date/time macros, which would make the build non-deterministic
906	KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
907
908	# enforce correct pointer usage
909	KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
910
911	# use the deterministic mode of AR if available
912	KBUILD_ARFLAGS := $(call ar-option,D)
913
914	include scripts/Makefile.kasan
915	include scripts/Makefile.extrawarn
916	include scripts/Makefile.ubsan
917
918	# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
919	# last assignments
920	KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
921	KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
922	KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
923
924	# Use --build-id when available.
925	LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
926	$(call cc-ldoption, -Wl$(comma)--build-id,))
927	KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
928	LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
929
930	ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
931	LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
932	endif
933
934	ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
935	LDFLAGS_vmlinux += $(call ld-option, -X,)
936	endif
937
938	# Default kernel image to build when no specific target is given.
939	# KBUILD_IMAGE may be overruled on the command line or
940	# set in the environment
941	# Also any assignments in arch/$(ARCH)/Makefile take precedence over
942	# this default value
943	export KBUILD_IMAGE ?= vmlinux
944
945	#
946	# INSTALL_PATH specifies where to place the updated kernel and system map
947	# images. Default is /boot, but you can set it to other values
948	export INSTALL_PATH ?= /boot
949
950	#
951	# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
952	# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
953	# an argument if needed. Otherwise it defaults to the kernel install path
954	#
955	export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
956
957	#
958	# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
959	# relocations required by build roots. This is not defined in the
960	# makefile but the argument can be passed to make if needed.
961	#
962
963	MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
964	export MODLIB
965
966	#
967	# INSTALL_MOD_STRIP, if defined, will cause modules to be
968	# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
969	# the default option --strip-debug will be used. Otherwise,
970	# INSTALL_MOD_STRIP value will be used as the options to the strip command.
971
972	ifdef INSTALL_MOD_STRIP
973	ifeq ($(INSTALL_MOD_STRIP),1)
974	mod_strip_cmd = $(STRIP) --strip-debug
975	else
976	mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
977	endif # INSTALL_MOD_STRIP=1
978	else
979	mod_strip_cmd = true
980	endif # INSTALL_MOD_STRIP
981	export mod_strip_cmd
982
983	# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
984	# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
985	# or CONFIG_MODULE_COMPRESS_XZ.
986
987	mod_compress_cmd = true
988	ifdef CONFIG_MODULE_COMPRESS
989	ifdef CONFIG_MODULE_COMPRESS_GZIP
990	mod_compress_cmd = gzip -n -f
991	endif # CONFIG_MODULE_COMPRESS_GZIP
992	ifdef CONFIG_MODULE_COMPRESS_XZ
993	mod_compress_cmd = xz -f
994	endif # CONFIG_MODULE_COMPRESS_XZ
995	endif # CONFIG_MODULE_COMPRESS
996	export mod_compress_cmd
997
998	# Select initial ramdisk compression format, default is gzip(1).
999	# This shall be used by the dracut(8) tool while creating an initramfs image.
1000	#
1001	INITRD_COMPRESS-y := gzip
1002	INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
1003	INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
1004	INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
1005	INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
1006	INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
1007	# do not export INITRD_COMPRESS, since we didn't actually
1008	# choose a sane default compression above.
1009	# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1010
1011	ifdef CONFIG_MODULE_SIG_ALL
1012	$(eval $(call config_filename,MODULE_SIG_KEY))
1013
1014	mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1015	else
1016	mod_sign_cmd = true
1017	endif
1018	export mod_sign_cmd
1019
1020
1021	ifeq ($(KBUILD_EXTMOD),)
1022	core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1023
1024	vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1025	$(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1026	$(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1027
1028	vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
1029	$(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1030
1031	init-y := $(patsubst %/, %/built-in.o, $(init-y))
1032	core-y := $(patsubst %/, %/built-in.o, $(core-y))
1033	drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
1034	net-y := $(patsubst %/, %/built-in.o, $(net-y))
1035	libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1036	libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
1037	libs-y := $(libs-y1) $(libs-y2)
1038	virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
1039
1040	# Externally visible symbols (used by link-vmlinux.sh)
1041	export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
1042	export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
1043	export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1044	export LDFLAGS_vmlinux
1045	# used by scripts/pacmage/Makefile
1046	export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
1047
1048	vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
1049
1050	# Include targets which we want to execute sequentially if the rest of the
1051	# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1052	# evaluated more than once.
1053	PHONY += vmlinux_prereq
1054	vmlinux_prereq: $(vmlinux-deps) FORCE
1055	ifdef CONFIG_HEADERS_CHECK
1056	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1057	endif
1058	ifdef CONFIG_GDB_SCRIPTS
1059	$(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
1060	endif
1061	ifdef CONFIG_TRIM_UNUSED_KSYMS
1062	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1063	"$(MAKE) -f $(srctree)/Makefile vmlinux"
1064	endif
1065
1066	# standalone target for easier testing
1067	include/generated/autoksyms.h: FORCE
1068	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1069
1070	ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1071
1072	# Final link of vmlinux with optional arch pass after final link
1073	cmd_link-vmlinux = \
1074	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1075	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1076
1077	vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1078	+$(call if_changed,link-vmlinux)
1079
1080	# Build samples along the rest of the kernel
1081	ifdef CONFIG_SAMPLES
1082	vmlinux-dirs += samples
1083	endif
1084
1085	# The actual objects are generated when descending,
1086	# make sure no implicit rule kicks in
1087	$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1088
1089	# Handle descending into subdirectories listed in $(vmlinux-dirs)
1090	# Preset locale variables to speed up the build process. Limit locale
1091	# tweaks to this spot to avoid wrong language settings when running
1092	# make menuconfig etc.
1093	# Error messages still appears in the original language
1094
1095	PHONY += $(vmlinux-dirs)
1096	$(vmlinux-dirs): prepare scripts
1097	$(Q)$(MAKE) $(build)=$@
1098
1099	define filechk_kernel.release
1100	echo "$(KERNELVERSION)"
1101	endef
1102
1103	define filechk_kernel.release_full
1104	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1105	endef
1106
1107
1108	# Store (new) KERNELRELEASE string in include/config/kernel.release
1109	include/config/kernel.release: include/config/auto.conf FORCE
1110	$(call filechk,kernel.release)
1111
1112	include/config/kernel.release_full: include/config/auto.conf FORCE
1113	$(call filechk,kernel.release_full)
1114
1115
1116	# Things we need to do before we recursively start building the kernel
1117	# or the modules are listed in "prepare".
1118	# A multi level approach is used. prepareN is processed before prepareN-1.
1119	# archprepare is used in arch Makefiles and when processed asm symlink,
1120	# version.h and scripts_basic is processed / created.
1121
1122	# Listed in dependency order
1123	PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1124
1125	# prepare3 is used to check if we are building in a separate output directory,
1126	# and if so do:
1127	# 1) Check that make has not been executed in the kernel src $(srctree)
1128	prepare3: include/config/kernel.release include/config/kernel.release_full
1129	ifneq ($(KBUILD_SRC),)
1130	@$(kecho) ' Using $(srctree) as source for kernel'
1131	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1132	echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1133	echo >&2 " in the '$(srctree)' directory.";\
1134	/bin/false; \
1135	fi;
1136	endif
1137
1138	# prepare2 creates a makefile if using a separate output directory.
1139	# From this point forward, .config has been reprocessed, so any rules
1140	# that need to depend on updated CONFIG_* values can be checked here.
1141	prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1142
1143	prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1144	include/config/auto.conf
1145	$(cmd_crmodverdir)
1146
1147	archprepare: archheaders archscripts prepare1 scripts_basic
1148
1149	prepare0: archprepare gcc-plugins
1150	$(Q)$(MAKE) $(build)=.
1151
1152	# All the preparing..
1153	prepare: prepare0 prepare-objtool
1154
1155	ifdef CONFIG_STACK_VALIDATION
1156	has_libelf := $(call try-run,\
1157	echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1158	ifeq ($(has_libelf),1)
1159	objtool_target := tools/objtool FORCE
1160	else
1161	$(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1162	SKIP_STACK_VALIDATION := 1
1163	export SKIP_STACK_VALIDATION
1164	endif
1165	endif
1166
1167	PHONY += prepare-objtool
1168	prepare-objtool: $(objtool_target)
1169
1170	# Check for CONFIG flags that require compiler support. Abort the build
1171	# after .config has been processed, but before the kernel build starts.
1172	#
1173	# For security-sensitive CONFIG options, we don't want to fallback and/or
1174	# silently change which compiler flags will be used, since that leads to
1175	# producing kernels with different security feature characteristics
1176	# depending on the compiler used. (For example, "But I selected
1177	# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1178	PHONY += prepare-compiler-check
1179	prepare-compiler-check: FORCE
1180	# Make sure we're using a supported toolchain with LTO_CLANG
1181	ifdef CONFIG_LTO_CLANG
1182	ifneq ($(call clang-ifversion, -ge, 0500, y), y)
1183	@echo Cannot use CONFIG_LTO_CLANG: requires clang 5.0 or later >&2 && exit 1
1184	endif
1185	ifneq ($(call gold-ifversion, -ge, 112000000, y), y)
1186	@echo Cannot use CONFIG_LTO_CLANG: requires GNU gold 1.12 or later >&2 && exit 1
1187	endif
1188	endif
1189	# Make sure compiler supports LTO flags
1190	ifdef lto-flags
1191	ifeq ($(call cc-option, $(lto-flags)),)
1192	@echo Cannot use CONFIG_LTO: $(lto-flags) not supported by compiler \
1193	>&2 && exit 1
1194	endif
1195	endif
1196	# Make sure compiler supports requested stack protector flag.
1197	ifdef stackp-name
1198	ifeq ($(call cc-option, $(stackp-flag)),)
1199	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1200	$(stackp-flag) not supported by compiler >&2 && exit 1
1201	endif
1202	endif
1203	# Make sure compiler does not have buggy stack-protector support.
1204	ifdef stackp-check
1205	ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1206	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1207	$(stackp-flag) available but compiler is broken >&2 && exit 1
1208	endif
1209	endif
1210	ifdef cfi-flags
1211	ifeq ($(call cc-option, $(cfi-flags)),)
1212	@echo Cannot use CONFIG_CFI: $(cfi-flags) not supported by compiler >&2 && exit 1
1213	endif
1214	endif
1215	@:
1216
1217	# Generate some files
1218	# ---------------------------------------------------------------------------
1219
1220	# KERNELRELEASE can change from a few different places, meaning version.h
1221	# needs to be updated, so this check is forced on all builds
1222
1223	uts_len := 64
1224	define filechk_utsrelease.h
1225	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1226	echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1227	exit 1; \
1228	fi; \
1229	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; echo \#define UTS_RELEASE_FULL \"$(KERNELRELEASE_FULL)\";\
1230	echo \#define UTS_RELEASEY \"$(basename $(KERNELRELEASE)).y\";)
1231	endef
1232
1233	define filechk_version.h
1234	(echo \#define LINUX_VERSION_CODE $(shell \
1235	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1236	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1237	endef
1238
1239	$(version_h): $(srctree)/Makefile FORCE
1240	$(call filechk,version.h)
1241	$(Q)rm -f $(old_version_h)
1242
1243	include/generated/utsrelease.h: include/config/kernel.release include/config/kernel.release_full FORCE
1244	$(call filechk,utsrelease.h)
1245
1246	PHONY += headerdep
1247	headerdep:
1248	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1249	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1250
1251	# ---------------------------------------------------------------------------
1252	# Firmware install
1253	INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1254	export INSTALL_FW_PATH
1255
1256	PHONY += firmware_install
1257	firmware_install:
1258	@mkdir -p $(objtree)/firmware
1259	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1260
1261	# ---------------------------------------------------------------------------
1262	# Kernel headers
1263
1264	#Default location for installed headers
1265	export INSTALL_HDR_PATH = $(objtree)/usr
1266
1267	# If we do an all arch process set dst to asm-$(hdr-arch)
1268	hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1269
1270	PHONY += archheaders
1271	archheaders:
1272
1273	PHONY += archscripts
1274	archscripts:
1275
1276	PHONY += __headers
1277	__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1278	$(Q)$(MAKE) $(build)=scripts build_unifdef
1279
1280	PHONY += headers_install_all
1281	headers_install_all:
1282	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1283
1284	PHONY += headers_install
1285	headers_install: __headers
1286	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1287	$(error Headers not exportable for the $(SRCARCH) architecture))
1288	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1289	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1290
1291	PHONY += headers_check_all
1292	headers_check_all: headers_install_all
1293	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1294
1295	PHONY += headers_check
1296	headers_check: headers_install
1297	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1298	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1299
1300	# ---------------------------------------------------------------------------
1301	# Kernel selftest
1302
1303	PHONY += kselftest
1304	kselftest:
1305	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1306
1307	kselftest-clean:
1308	$(Q)$(MAKE) -C tools/testing/selftests clean
1309
1310	PHONY += kselftest-merge
1311	kselftest-merge:
1312	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1313	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1314	-m $(objtree)/.config \
1315	$(srctree)/tools/testing/selftests/*/config
1316	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1317
1318	# ---------------------------------------------------------------------------
1319	# Modules
1320
1321	ifdef CONFIG_MODULES
1322
1323	# By default, build modules as well
1324
1325	all: modules
1326
1327	# Build modules
1328	#
1329	# A module can be listed more than once in obj-m resulting in
1330	# duplicate lines in modules.order files. Those are removed
1331	# using awk while concatenating to the final file.
1332
1333	PHONY += modules
1334	modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1335	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1336	@$(kecho) ' Building modules, stage 2.';
1337	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1338	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1339
1340	modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1341	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1342
1343	%/modules.builtin: include/config/auto.conf
1344	$(Q)$(MAKE) $(modbuiltin)=$*
1345
1346
1347	# Target to prepare building external modules
1348	PHONY += modules_prepare
1349	modules_prepare: prepare scripts
1350
1351	# Target to install modules
1352	PHONY += modules_install
1353	modules_install: _modinst_ _modinst_post
1354
1355	PHONY += _modinst_
1356	_modinst_:
1357	@rm -rf $(MODLIB)/kernel
1358	@rm -f $(MODLIB)/source
1359	@mkdir -p $(MODLIB)/kernel
1360	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1361	@if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1362	rm -f $(MODLIB)/build ; \
1363	ln -s $(CURDIR) $(MODLIB)/build ; \
1364	fi
1365	@cp -f $(objtree)/modules.order $(MODLIB)/
1366	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1367	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1368
1369	# This depmod is only for convenience to give the initial
1370	# boot a modules.dep even before / is mounted read-write. However the
1371	# boot script depmod is the master version.
1372	PHONY += _modinst_post
1373	_modinst_post: _modinst_
1374	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1375	$(call cmd,depmod)
1376
1377	ifeq ($(CONFIG_MODULE_SIG), y)
1378	PHONY += modules_sign
1379	modules_sign:
1380	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1381	endif
1382
1383	else # CONFIG_MODULES
1384
1385	# Modules not configured
1386	# ---------------------------------------------------------------------------
1387
1388	PHONY += modules modules_install
1389	modules modules_install:
1390	@echo >&2
1391	@echo >&2 "The present kernel configuration has modules disabled."
1392	@echo >&2 "Type 'make config' and enable loadable module support."
1393	@echo >&2 "Then build a kernel with module support enabled."
1394	@echo >&2
1395	@exit 1
1396
1397	endif # CONFIG_MODULES
1398
1399	###
1400	# Cleaning is done on three levels.
1401	# make clean Delete most generated files
1402	# Leave enough to build external modules
1403	# make mrproper Delete the current configuration, and all generated files
1404	# make distclean Remove editor backup files, patch leftover files and the like
1405
1406	# Directories & files removed with 'make clean'
1407	CLEAN_DIRS += $(MODVERDIR)
1408
1409	# Directories & files removed with 'make mrproper'
1410	MRPROPER_DIRS += include/config usr/include include/generated \
1411	arch/*/include/generated .tmp_objdiff
1412	MRPROPER_FILES += .config .config.old .version .old_version \
1413	Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1414	signing_key.pem signing_key.priv signing_key.x509 \
1415	x509.genkey extra_certificates signing_key.x509.keyid \
1416	signing_key.x509.signer vmlinux-gdb.py
1417
1418	# clean - Delete most, but leave enough to build external modules
1419	#
1420	clean: rm-dirs := $(CLEAN_DIRS)
1421	clean: rm-files := $(CLEAN_FILES)
1422	clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1423
1424	PHONY += $(clean-dirs) clean archclean vmlinuxclean
1425	$(clean-dirs):
1426	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1427
1428	vmlinuxclean:
1429	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1430	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1431
1432	clean: archclean vmlinuxclean
1433
1434	# mrproper - Delete all generated files, including .config
1435	#
1436	mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1437	mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1438	mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1439
1440	PHONY += $(mrproper-dirs) mrproper archmrproper
1441	$(mrproper-dirs):
1442	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1443
1444	mrproper: clean archmrproper $(mrproper-dirs)
1445	$(call cmd,rmdirs)
1446	$(call cmd,rmfiles)
1447
1448	# distclean
1449	#
1450	PHONY += distclean
1451
1452	distclean: mrproper
1453	@find $(srctree) $(RCS_FIND_IGNORE) \
1454	\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1455	-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1456	-o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1457	-type f -print | xargs rm -f
1458
1459
1460	# Packaging of the kernel to various formats
1461	# ---------------------------------------------------------------------------
1462	# rpm target kept for backward compatibility
1463	package-dir := scripts/package
1464
1465	%src-pkg: FORCE
1466	$(Q)$(MAKE) $(build)=$(package-dir) $@
1467	%pkg: include/config/kernel.release FORCE
1468	$(Q)$(MAKE) $(build)=$(package-dir) $@
1469	rpm: include/config/kernel.release FORCE
1470	$(Q)$(MAKE) $(build)=$(package-dir) $@
1471
1472
1473	# Brief documentation of the typical targets used
1474	# ---------------------------------------------------------------------------
1475
1476	boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1477	boards := $(sort $(notdir $(boards)))
1478	board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1479	board-dirs := $(sort $(notdir $(board-dirs:/=)))
1480
1481	PHONY += help
1482	help:
1483	@echo 'Cleaning targets:'
1484	@echo ' clean - Remove most generated files but keep the config and'
1485	@echo ' enough build support to build external modules'
1486	@echo ' mrproper - Remove all generated files + config + various backup files'
1487	@echo ' distclean - mrproper + remove editor backup and patch files'
1488	@echo ''
1489	@echo 'Configuration targets:'
1490	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1491	@echo ''
1492	@echo 'Other generic targets:'
1493	@echo ' all - Build all targets marked with [*]'
1494	@echo '* vmlinux - Build the bare kernel'
1495	@echo '* modules - Build all modules'
1496	@echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1497	@echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1498	@echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1499	@echo ' dir/ - Build all files in dir and below'
1500	@echo ' dir/file.[ois] - Build specified target only'
1501	@echo ' dir/file.ll - Build the LLVM assembly file'
1502	@echo ' (requires compiler support for LLVM assembly generation)'
1503	@echo ' dir/file.lst - Build specified mixed source/assembly target only'
1504	@echo ' (requires a recent binutils and recent build (System.map))'
1505	@echo ' dir/file.ko - Build module including final link'
1506	@echo ' modules_prepare - Set up for building external modules'
1507	@echo ' tags/TAGS - Generate tags file for editors'
1508	@echo ' cscope - Generate cscope index'
1509	@echo ' gtags - Generate GNU GLOBAL index'
1510	@echo ' kernelrelease - Output the release version string (use with make -s)'
1511	@echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1512	@echo ' image_name - Output the image name (use with make -s)'
1513	@echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1514	echo ' (default: $(INSTALL_HDR_PATH))'; \
1515	echo ''
1516	@echo 'Static analysers'
1517	@echo ' checkstack - Generate a list of stack hogs'
1518	@echo ' namespacecheck - Name space analysis on compiled kernel'
1519	@echo ' versioncheck - Sanity check on version.h usage'
1520	@echo ' includecheck - Check for duplicate included header files'
1521	@echo ' export_report - List the usages of all exported symbols'
1522	@echo ' headers_check - Sanity check on exported headers'
1523	@echo ' headerdep - Detect inclusion cycles in headers'
1524	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1525	@echo ''
1526	@echo 'Kernel selftest'
1527	@echo ' kselftest - Build and run kernel selftest (run as root)'
1528	@echo ' Build, install, and boot kernel before'
1529	@echo ' running kselftest on it'
1530	@echo ' kselftest-clean - Remove all generated kselftest files'
1531	@echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1532	@echo ' .config.'
1533	@echo ''
1534	@echo 'Kernel packaging:'
1535	@$(MAKE) $(build)=$(package-dir) help
1536	@echo ''
1537	@echo 'Documentation targets:'
1538	@$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1539	@echo ''
1540	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1541	@echo ''
1542	@echo 'Architecture specific targets ($(SRCARCH)):'
1543	@$(if $(archhelp),$(archhelp),\
1544	echo ' No architecture specific help defined for $(SRCARCH)')
1545	@echo ''
1546	@$(if $(boards), \
1547	$(foreach b, $(boards), \
1548	printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1549	echo '')
1550	@$(if $(board-dirs), \
1551	$(foreach b, $(board-dirs), \
1552	printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1553	printf " %-16s - Show all of the above\\n" help-boards; \
1554	echo '')
1555
1556	@echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1557	@echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1558	@echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1559	@echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1560	@echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1561	@echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1562	@echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1563	@echo ' 1: warnings which may be relevant and do not occur too often'
1564	@echo ' 2: warnings which occur quite often but may still be relevant'
1565	@echo ' 3: more obscure warnings, can most likely be ignored'
1566	@echo ' Multiple levels can be combined with W=12 or W=123'
1567	@echo ''
1568	@echo 'Execute "make" or "make all" to build all targets marked with [*] '
1569	@echo 'For further info see the ./README file'
1570
1571
1572	help-board-dirs := $(addprefix help-,$(board-dirs))
1573
1574	help-boards: $(help-board-dirs)
1575
1576	boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1577
1578	$(help-board-dirs): help-%:
1579	@echo 'Architecture specific targets ($(SRCARCH) $*):'
1580	@$(if $(boards-per-dir), \
1581	$(foreach b, $(boards-per-dir), \
1582	printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1583	echo '')
1584
1585
1586	# Documentation targets
1587	# ---------------------------------------------------------------------------
1588	DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1589	PHONY += $(DOC_TARGETS)
1590	$(DOC_TARGETS): scripts_basic FORCE
1591	$(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1592	$(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1593	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1594
1595	else # KBUILD_EXTMOD
1596
1597	###
1598	# External module support.
1599	# When building external modules the kernel used as basis is considered
1600	# read-only, and no consistency checks are made and the make
1601	# system is not used on the basis kernel. If updates are required
1602	# in the basis kernel ordinary make commands (without M=...) must
1603	# be used.
1604	#
1605	# The following are the only valid targets when building external
1606	# modules.
1607	# make M=dir clean Delete all automatically generated files
1608	# make M=dir modules Make all modules in specified dir
1609	# make M=dir Same as 'make M=dir modules'
1610	# make M=dir modules_install
1611	# Install the modules built in the module directory
1612	# Assumes install directory is already created
1613
1614	# We are always building modules
1615	KBUILD_MODULES := 1
1616	PHONY += crmodverdir
1617	crmodverdir:
1618	$(cmd_crmodverdir)
1619
1620	PHONY += $(objtree)/Module.symvers
1621	$(objtree)/Module.symvers:
1622	@test -e $(objtree)/Module.symvers || ( \
1623	echo; \
1624	echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1625	echo " is missing; modules will have no dependencies and modversions."; \
1626	echo )
1627
1628	module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1629	PHONY += $(module-dirs) modules
1630	$(module-dirs): crmodverdir $(objtree)/Module.symvers
1631	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1632
1633	modules: $(module-dirs)
1634	@$(kecho) ' Building modules, stage 2.';
1635	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1636
1637	PHONY += modules_install
1638	modules_install: _emodinst_ _emodinst_post
1639
1640	install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1641	PHONY += _emodinst_
1642	_emodinst_:
1643	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1644	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1645
1646	PHONY += _emodinst_post
1647	_emodinst_post: _emodinst_
1648	$(call cmd,depmod)
1649
1650	clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1651
1652	PHONY += $(clean-dirs) clean
1653	$(clean-dirs):
1654	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1655
1656	clean: rm-dirs := $(MODVERDIR)
1657	clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1658
1659	PHONY += help
1660	help:
1661	@echo ' Building external modules.'
1662	@echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1663	@echo ''
1664	@echo ' modules - default target, build the module(s)'
1665	@echo ' modules_install - install the module'
1666	@echo ' clean - remove generated files in module directory only'
1667	@echo ''
1668
1669	# Dummies...
1670	PHONY += prepare scripts
1671	prepare: ;
1672	scripts: ;
1673	endif # KBUILD_EXTMOD
1674
1675	clean: $(clean-dirs)
1676	$(call cmd,rmdirs)
1677	$(call cmd,rmfiles)
1678	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1679	\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1680	-o -name '*.ko.*' \
1681	-o -name '*.dwo' \
1682	-o -name '*.su' \
1683	-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1684	-o -name '*.symtypes' -o -name 'modules.order' \
1685	-o -name modules.builtin -o -name '.tmp_*.o.*' \
1686	-o -name '*.c.[012]*.*' \
1687	-o -name '*.ll' \
1688	-o -name '*.gcno' \
1689	-o -name '*.*.symversions' \) -type f -print | xargs rm -f
1690
1691	# Generate tags for editors
1692	# ---------------------------------------------------------------------------
1693	quiet_cmd_tags = GEN $@
1694	cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1695
1696	tags TAGS cscope gtags: FORCE
1697	$(call cmd,tags)
1698
1699	# Scripts to check various things for consistency
1700	# ---------------------------------------------------------------------------
1701
1702	PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1703
1704	includecheck:
1705	find $(srctree)/* $(RCS_FIND_IGNORE) \
1706	-name '*.[hcS]' -type f -print | sort \
1707	| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1708
1709	versioncheck:
1710	find $(srctree)/* $(RCS_FIND_IGNORE) \
1711	-name '*.[hcS]' -type f -print | sort \
1712	| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1713
1714	coccicheck:
1715	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1716
1717	namespacecheck:
1718	$(PERL) $(srctree)/scripts/namespace.pl
1719
1720	export_report:
1721	$(PERL) $(srctree)/scripts/export_report.pl
1722
1723	endif #ifeq ($(config-targets),1)
1724	endif #ifeq ($(mixed-targets),1)
1725
1726	PHONY += checkstack kernelrelease kernelversion image_name
1727
1728	# UML needs a little special treatment here. It wants to use the host
1729	# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1730	# else wants $(ARCH), including people doing cross-builds, which means
1731	# that $(SUBARCH) doesn't work here.
1732	ifeq ($(ARCH), um)
1733	CHECKSTACK_ARCH := $(SUBARCH)
1734	else
1735	CHECKSTACK_ARCH := $(ARCH)
1736	endif
1737	checkstack:
1738	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1739	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1740
1741	kernelrelease:
1742	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1743
1744	kernelversion:
1745	@echo $(KERNELVERSION)
1746
1747	image_name:
1748	@echo $(KBUILD_IMAGE)
1749
1750	# Clear a bunch of variables before executing the submake
1751	tools/: FORCE
1752	$(Q)mkdir -p $(objtree)/tools
1753	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1754
1755	tools/%: FORCE
1756	$(Q)mkdir -p $(objtree)/tools
1757	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1758
1759	# Single targets
1760	# ---------------------------------------------------------------------------
1761	# Single targets are compatible with:
1762	# - build with mixed source and output
1763	# - build with separate output dir 'make O=...'
1764	# - external modules
1765	#
1766	# target-dir => where to store outputfile
1767	# build-dir => directory in kernel source tree to use
1768
1769	ifeq ($(KBUILD_EXTMOD),)
1770	build-dir = $(patsubst %/,%,$(dir $@))
1771	target-dir = $(dir $@)
1772	else
1773	zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1774	build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1775	target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1776	endif
1777
1778	%.s: %.c prepare scripts FORCE
1779	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1780	%.i: %.c prepare scripts FORCE
1781	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1782	%.o: %.c prepare scripts FORCE
1783	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1784	%.lst: %.c prepare scripts FORCE
1785	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1786	%.s: %.S prepare scripts FORCE
1787	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1788	%.o: %.S prepare scripts FORCE
1789	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1790	%.symtypes: %.c prepare scripts FORCE
1791	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1792	%.ll: %.c prepare scripts FORCE
1793	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1794
1795	# Modules
1796	/: prepare scripts FORCE
1797	$(cmd_crmodverdir)
1798	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1799	$(build)=$(build-dir)
1800	# Make sure the latest headers are built for Documentation
1801	Documentation/ samples/: headers_install
1802	%/: prepare scripts FORCE
1803	$(cmd_crmodverdir)
1804	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1805	$(build)=$(build-dir)
1806	%.ko: prepare scripts FORCE
1807	$(cmd_crmodverdir)
1808	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1809	$(build)=$(build-dir) $(@:.ko=.o)
1810	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1811
1812	# FIXME Should go into a make.lib or something
1813	# ===========================================================================
1814
1815	quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1816	cmd_rmdirs = rm -rf $(rm-dirs)
1817
1818	quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1819	cmd_rmfiles = rm -f $(rm-files)
1820
1821	# Run depmod only if we have System.map and depmod is executable
1822	quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1823	cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1824	$(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1825
1826	# Create temporary dir for module support files
1827	# clean it up only when building all modules
1828	cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1829	$(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1830
1831	# read all saved command lines
1832
1833	targets := $(wildcard $(sort $(targets)))
1834	cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1835
1836	ifneq ($(cmd_files),)
1837	$(cmd_files): ; # Do not try to update included dependency files
1838	include $(cmd_files)
1839	endif
1840
1841	endif # skip-makefile
1842
1843	PHONY += FORCE
1844	FORCE:
1845
1846	# Declare the contents of the .PHONY variable as phony. We keep that
1847	# information in a variable so we can use it in if_changed and friends.
1848	.PHONY: $(PHONY)
1849