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b2441318 1# SPDX-License-Identifier: GPL-2.0
bfeffd15
LT
2VERSION = 5
3PATCHLEVEL = 0
55922c9d 4SUBLEVEL = 0
bfeffd15 5EXTRAVERSION = -rc1
2e6e902d 6NAME = Shy Crocodile
1da177e4
LT
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
ba634ece
MY
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
80463f1b
MY
18# Do not use make's built-in rules and variables
19# (this increases performance and avoids hard-to-debug behaviour)
20MAKEFLAGS += -rR
1da177e4 21
c051346b 22# Avoid funny character set dependencies
06b5dc64 23unexport LC_ALL
c051346b
PA
24LC_COLLATE=C
25LC_NUMERIC=C
07105202 26export LC_COLLATE LC_NUMERIC
c051346b 27
ab7474ea
BP
28# Avoid interference with shell env settings
29unexport GREP_OPTIONS
30
1da177e4
LT
31# We are using a recursive build, so we need to do a little thinking
32# to get the ordering right.
33#
34# Most importantly: sub-Makefiles should only ever modify files in
35# their own directory. If in some directory we have a dependency on
36# a file in another dir (which doesn't happen often, but it's often
f49821ee 37# unavoidable when linking the built-in.a targets which finally
1da177e4
LT
38# turn into vmlinux), we will call a sub make in that other dir, and
39# after that we are sure that everything which is in that other dir
40# is now up to date.
41#
42# The only cases where we need to modify files which have global
43# effects are thus separated out and done before the recursive
44# descending is started. They are now explicitly listed as the
45# prepare rule.
46
066b7ed9
MM
47# Beautify output
48# ---------------------------------------------------------------------------
49#
50# Normally, we echo the whole command before executing it. By making
51# that echo $($(quiet)$(cmd)), we now have the possibility to set
52# $(quiet) to choose other forms of output instead, e.g.
53#
54# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
55# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
56#
57# If $(quiet) is empty, the whole command will be printed.
58# If it is set to "quiet_", only the short version will be printed.
59# If it is set to "silent_", nothing will be printed at all, since
60# the variable $(silent_cmd_cc_o_c) doesn't exist.
61#
62# A simple variant is to prefix commands with $(Q) - that's useful
63# for commands that shall be hidden in non-verbose mode.
64#
65# $(Q)ln $@ :<
66#
67# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
68# If KBUILD_VERBOSE equals 1 then the above command is displayed.
69#
1da177e4
LT
70# To put more focus on warnings, be less verbose as default
71# Use 'make V=1' to see the full commands
72
b8b0618c
CR
73ifeq ("$(origin V)", "command line")
74 KBUILD_VERBOSE = $(V)
1da177e4
LT
75endif
76ifndef KBUILD_VERBOSE
77 KBUILD_VERBOSE = 0
78endif
79
066b7ed9
MM
80ifeq ($(KBUILD_VERBOSE),1)
81 quiet =
82 Q =
83else
84 quiet=quiet_
85 Q = @
86endif
87
88# If the user is running make -s (silent mode), suppress echoing of
89# commands
90
6f0fa58e 91ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
066b7ed9 92 quiet=silent_
e572d088 93 tools_silent=s
066b7ed9 94endif
066b7ed9
MM
95
96export quiet Q KBUILD_VERBOSE
97
1da177e4
LT
98# kbuild supports saving output files in a separate directory.
99# To locate output files in a separate directory two syntaxes are supported.
100# In both cases the working directory must be the root of the kernel src.
101# 1) O=
102# Use "make O=dir/to/store/output/files/"
070b98bf 103#
1da177e4
LT
104# 2) Set KBUILD_OUTPUT
105# Set the environment variable KBUILD_OUTPUT to point to the directory
106# where the output files shall be placed.
107# export KBUILD_OUTPUT=dir/to/store/output/files/
108# make
109#
110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111# variable.
112
c4e6fff1
C
113# KBUILD_SRC is not intended to be used by the regular user (for now),
114# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
1da177e4
LT
115ifeq ($(KBUILD_SRC),)
116
117# OK, Make called in directory where kernel src resides
118# Do we want to locate output files in a separate directory?
b8b0618c
CR
119ifeq ("$(origin O)", "command line")
120 KBUILD_OUTPUT := $(O)
1da177e4
LT
121endif
122
1cacc9ab
SR
123# Cancel implicit rules on top Makefile
124$(CURDIR)/Makefile Makefile: ;
125
51193b76
RJ
126ifneq ($(words $(subst :, ,$(CURDIR))), 1)
127 $(error main directory cannot contain spaces nor colons)
128endif
129
1da177e4 130ifneq ($(KBUILD_OUTPUT),)
1da177e4
LT
131# check that the output directory actually exists
132saved-output := $(KBUILD_OUTPUT)
028568d8 133KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
16f8259c 134 && pwd)
1da177e4 135$(if $(KBUILD_OUTPUT),, \
1c9e70a5 136 $(error failed to create output directory "$(saved-output)"))
1da177e4 137
80463f1b
MY
138# Look for make include files relative to root of kernel src
139#
140# This does not become effective immediately because MAKEFLAGS is re-parsed
141# once after the Makefile is read. It is OK since we are going to invoke
142# 'sub-make' below.
143MAKEFLAGS += --include-dir=$(CURDIR)
144
0b35786d
MM
145PHONY += $(MAKECMDGOALS) sub-make
146
1cacc9ab 147$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
16f89098 148 @:
0b35786d 149
c4e6fff1 150# Invoke a second make in the output directory, passing relevant variables
2e8d696b 151sub-make:
745a2543 152 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
aa55c8e2 153 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
1da177e4
LT
154
155# Leave processing to above invocation of make
156skip-makefile := 1
157endif # ifneq ($(KBUILD_OUTPUT),)
158endif # ifeq ($(KBUILD_SRC),)
159
160# We process the rest of the Makefile if this is the final invocation of make
161ifeq ($(skip-makefile),)
162
7ff52571
MY
163# Do not print "Entering directory ...",
164# but we want to display it when entering to the output directory
165# so that IDEs/editors are able to understand relative filenames.
166MAKEFLAGS += --no-print-directory
167
aa55c8e2
MY
168# Call a source code checker (by default, "sparse") as part of the
169# C compilation.
170#
171# Use 'make C=1' to enable checking of only re-compiled files.
172# Use 'make C=2' to enable checking of *all* source files, regardless
173# of whether they are re-compiled or not.
174#
036db11c
C
175# See the file "Documentation/dev-tools/sparse.rst" for more details,
176# including where to get the "sparse" utility.
aa55c8e2
MY
177
178ifeq ("$(origin C)", "command line")
179 KBUILD_CHECKSRC = $(C)
180endif
181ifndef KBUILD_CHECKSRC
182 KBUILD_CHECKSRC = 0
183endif
184
185# Use make M=dir to specify directory of external module to build
186# Old syntax make ... SUBDIRS=$PWD is still supported
187# Setting the environment variable KBUILD_EXTMOD take precedence
188ifdef SUBDIRS
0126be38
MY
189 $(warning ================= WARNING ================)
190 $(warning 'SUBDIRS' will be removed after Linux 5.3)
191 $(warning Please use 'M=' or 'KBUILD_EXTMOD' instead)
192 $(warning ==========================================)
aa55c8e2
MY
193 KBUILD_EXTMOD ?= $(SUBDIRS)
194endif
195
196ifeq ("$(origin M)", "command line")
197 KBUILD_EXTMOD := $(M)
198endif
199
9da0763b
MM
200ifeq ($(KBUILD_SRC),)
201 # building in the source tree
202 srctree := .
203else
204 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
205 # building in a subdirectory of the source tree
206 srctree := ..
207 else
208 srctree := $(KBUILD_SRC)
209 endif
210endif
2c1f4f12
MY
211
212export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
213
7e1c0477 214objtree := .
1da177e4
LT
215src := $(srctree)
216obj := $(objtree)
217
0f558c33 218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
1da177e4 219
11294235 220export srctree objtree VPATH
1da177e4 221
2c1f4f12
MY
222# To make sure we do not include .config for any of the *config targets
223# catch them early, and hand them over to scripts/kconfig/Makefile
224# It is allowed to specify more targets when calling make, including
225# mixing *config targets and build targets.
226# For example 'make oldconfig all'.
227# Detect when mixed targets is specified, and make a second invocation
228# of make so .config is not included in this case either (for *config).
229
230version_h := include/generated/uapi/linux/version.h
231old_version_h := include/linux/version.h
232
22340a06
MY
233clean-targets := %clean mrproper cleandocs
234no-dot-config-targets := $(clean-targets) \
2c1f4f12
MY
235 cscope gtags TAGS tags help% %docs check% coccicheck \
236 $(version_h) headers_% archheaders archscripts \
63e31a67 237 %asm-generic kernelversion %src-pkg
a29d4d8c
MY
238no-sync-config-targets := $(no-dot-config-targets) install %install \
239 kernelrelease
2c1f4f12 240
d7942413
MY
241config-targets := 0
242mixed-targets := 0
243dot-config := 1
244may-sync-config := 1
2c1f4f12
MY
245
246ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
247 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
248 dot-config := 0
249 endif
250endif
251
d7942413
MY
252ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
253 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
254 may-sync-config := 0
255 endif
256endif
257
258ifneq ($(KBUILD_EXTMOD),)
259 may-sync-config := 0
260endif
261
2c1f4f12
MY
262ifeq ($(KBUILD_EXTMOD),)
263 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
264 config-targets := 1
265 ifneq ($(words $(MAKECMDGOALS)),1)
266 mixed-targets := 1
267 endif
268 endif
269endif
22340a06
MY
270
271# For "make -j clean all", "make -j mrproper defconfig all", etc.
272ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
273 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
274 mixed-targets := 1
275 endif
276endif
277
2c1f4f12
MY
278# install and modules_install need also be processed one by one
279ifneq ($(filter install,$(MAKECMDGOALS)),)
280 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
281 mixed-targets := 1
282 endif
283endif
284
285ifeq ($(mixed-targets),1)
286# ===========================================================================
287# We're called with mixed targets (*config and build targets).
288# Handle them one by one.
289
290PHONY += $(MAKECMDGOALS) __build_one_by_one
291
292$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
293 @:
294
295__build_one_by_one:
296 $(Q)set -e; \
297 for i in $(MAKECMDGOALS); do \
298 $(MAKE) -f $(srctree)/Makefile $$i; \
299 done
300
301else
302
303# We need some generic definitions (do not try to remake the file).
304scripts/Kbuild.include: ;
305include scripts/Kbuild.include
306
307# Read KERNELRELEASE from include/config/kernel.release (if it exists)
308KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
309KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
310export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
311
b2d35fa5 312include scripts/subarch.include
1da177e4
LT
313
314# Cross compiling and selecting different set of gcc/bin-utils
315# ---------------------------------------------------------------------------
316#
317# When performing cross compilation for other architectures ARCH shall be set
318# to the target architecture. (See arch/* for the possibilities).
319# ARCH can be set during invocation of make:
320# make ARCH=ia64
321# Another way is to have ARCH set in the environment.
322# The default ARCH is the host where make is executed.
323
324# CROSS_COMPILE specify the prefix used for all executables used
325# during compilation. Only gcc and related bin-utils executables
326# are prefixed with $(CROSS_COMPILE).
327# CROSS_COMPILE can be set on the command line
328# make CROSS_COMPILE=ia64-linux-
329# Alternatively CROSS_COMPILE can be set in the environment.
330# Default value for CROSS_COMPILE is not to prefix executables
331# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
2331d1a6 332ARCH ?= $(SUBARCH)
1da177e4
LT
333
334# Architecture as present in compile.h
6752ed90
TG
335UTS_MACHINE := $(ARCH)
336SRCARCH := $(ARCH)
1da177e4 337
d746d647
SR
338# Additional ARCH settings for x86
339ifeq ($(ARCH),i386)
340 SRCARCH := x86
341endif
342ifeq ($(ARCH),x86_64)
343 SRCARCH := x86
344endif
74b469f2 345
5e538790 346# Additional ARCH settings for sparc
e69f58c0
NK
347ifeq ($(ARCH),sparc32)
348 SRCARCH := sparc
349endif
a439fe51 350ifeq ($(ARCH),sparc64)
5e538790 351 SRCARCH := sparc
a439fe51 352endif
2fb9b1bd 353
3cc000b5
PM
354# Additional ARCH settings for sh
355ifeq ($(ARCH),sh64)
356 SRCARCH := sh
357endif
358
14cdd3c4 359KCONFIG_CONFIG ?= .config
41263fc6 360export KCONFIG_CONFIG
14cdd3c4 361
1da177e4
LT
362# SHELL used by kbuild
363CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
364 else if [ -x /bin/bash ]; then echo /bin/bash; \
365 else echo sh; fi ; fi)
366
6d79a7b4
MY
367HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
368HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
369HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
d7f14c66 370
070b98bf
SR
371HOSTCC = gcc
372HOSTCXX = g++
96f14fe7 373KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
f92d19e0
LA
374 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
375 $(HOSTCFLAGS)
376KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
377KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
378KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
1da177e4 379
1da177e4 380# Make variables (CC, etc...)
1da177e4
LT
381AS = $(CROSS_COMPILE)as
382LD = $(CROSS_COMPILE)ld
383CC = $(CROSS_COMPILE)gcc
384CPP = $(CC) -E
385AR = $(CROSS_COMPILE)ar
386NM = $(CROSS_COMPILE)nm
387STRIP = $(CROSS_COMPILE)strip
388OBJCOPY = $(CROSS_COMPILE)objcopy
389OBJDUMP = $(CROSS_COMPILE)objdump
73a4f6db
MY
390LEX = flex
391YACC = bison
1da177e4
LT
392AWK = awk
393GENKSYMS = scripts/genksyms/genksyms
caa27b66 394INSTALLKERNEL := installkernel
1da177e4 395DEPMOD = /sbin/depmod
1da177e4 396PERL = perl
011bf125 397PYTHON = python
e9781b52
MY
398PYTHON2 = python2
399PYTHON3 = python3
1da177e4
LT
400CHECK = sparse
401
80a7d1d9 402CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
6c49f359 403 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
b36fad65 404NOSTDINC_FLAGS =
6588169d
SR
405CFLAGS_MODULE =
406AFLAGS_MODULE =
407LDFLAGS_MODULE =
1da177e4
LT
408CFLAGS_KERNEL =
409AFLAGS_KERNEL =
b36fad65 410LDFLAGS_vmlinux =
1da177e4 411
abbf1590
DH
412# Use USERINCLUDE when you must reference the UAPI directories only.
413USERINCLUDE := \
9d022c54
MY
414 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
415 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
abbf1590 416 -I$(srctree)/include/uapi \
3308b285 417 -I$(objtree)/include/generated/uapi \
abbf1590
DH
418 -include $(srctree)/include/linux/kconfig.h
419
1da177e4
LT
420# Use LINUXINCLUDE when you must reference the include/ directory.
421# Needed to be compatible with the O= option
abbf1590 422LINUXINCLUDE := \
9d022c54
MY
423 -I$(srctree)/arch/$(SRCARCH)/include \
424 -I$(objtree)/arch/$(SRCARCH)/include/generated \
abbf1590 425 $(if $(KBUILD_SRC), -I$(srctree)/include) \
f8224f7f
MY
426 -I$(objtree)/include \
427 $(USERINCLUDE)
1da177e4 428
42a92bcc 429KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
eeb5687a 430KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
42a92bcc 431 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
61a0902a 432 -Werror-implicit-function-declaration -Werror=implicit-int \
51b97e35 433 -Wno-format-security \
433dc2eb
MY
434 -std=gnu89
435KBUILD_CPPFLAGS := -D__KERNEL__
80c00ba9
SR
436KBUILD_AFLAGS_KERNEL :=
437KBUILD_CFLAGS_KERNEL :=
6588169d
SR
438KBUILD_AFLAGS_MODULE := -DMODULE
439KBUILD_CFLAGS_MODULE := -DMODULE
440KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
d503ac53 441KBUILD_LDFLAGS :=
433dc2eb 442GCC_PLUGINS_CFLAGS :=
1da177e4 443
96f14fe7 444export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
8377bd2b 445export CPP AR NM STRIP OBJCOPY OBJDUMP KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS
e9781b52 446export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
10844aeb 447export HOSTCXX KBUILD_HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
1da177e4 448
d503ac53 449export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
0e410e15
AK
450export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
451export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
222d394d 452export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
6588169d 453export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
80c00ba9 454export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
40df759e 455export KBUILD_ARFLAGS
1da177e4
LT
456
457# When compiling out-of-tree modules, put MODVERDIR in the module
458# tree rather than in the kernel tree. The kernel tree might
459# even be read-only.
460export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
461
1da177e4
LT
462# Files to ignore in find ... statements
463
ae63b2d7
PB
464export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
465 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
466 -prune -o
450c6076
JJ
467export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
468 --exclude CVS --exclude .pc --exclude .hg --exclude .git
1da177e4
LT
469
470# ===========================================================================
471# Rules shared between *config targets and build targets
472
312a3d09 473# Basic helpers built in scripts/basic/
4f193362 474PHONY += scripts_basic
1da177e4
LT
475scripts_basic:
476 $(Q)$(MAKE) $(build)=scripts/basic
638adb05 477 $(Q)rm -f .tmp_quiet_recordmcount
1da177e4 478
cd05e6bd
JB
479# To avoid any implicit rule to kick in, define an empty command.
480scripts/basic/%: scripts_basic ;
481
4f193362 482PHONY += outputmakefile
fd5f0cd6
JB
483# outputmakefile generates a Makefile in the output directory, if using a
484# separate output directory. This allows convenient use of make in the
485# output directory.
1da177e4 486outputmakefile:
fd5f0cd6 487ifneq ($(KBUILD_SRC),)
92979997 488 $(Q)ln -fsn $(srctree) source
4fd61277 489 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
fd5f0cd6 490endif
1da177e4 491
99516742 492ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
ae6b289a 493ifneq ($(CROSS_COMPILE),)
238bcbc4 494CLANG_FLAGS := --target=$(notdir $(CROSS_COMPILE:%-=%))
ef8c4ed9 495GCC_TOOLCHAIN_DIR := $(dir $(shell which $(LD)))
238bcbc4 496CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
ef8c4ed9 497GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
ae6b289a
CF
498endif
499ifneq ($(GCC_TOOLCHAIN),)
238bcbc4 500CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
ae6b289a 501endif
238bcbc4
MY
502CLANG_FLAGS += -no-integrated-as
503KBUILD_CFLAGS += $(CLANG_FLAGS)
504KBUILD_AFLAGS += $(CLANG_FLAGS)
3bd98050 505export CLANG_FLAGS
ae6b289a
CF
506endif
507
d5028ba8 508RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
2e549b2e 509RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
d5028ba8 510RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
2e549b2e 511RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
d5028ba8 512RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
2e549b2e 513RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
d5028ba8 514export RETPOLINE_CFLAGS
2e549b2e 515export RETPOLINE_VDSO_CFLAGS
d5028ba8 516
315bab4e
MY
517# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
518# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
519# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
520# and from include/config/auto.conf.cmd to detect the compiler upgrade.
521CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
522
1da177e4
LT
523ifeq ($(config-targets),1)
524# ===========================================================================
525# *config targets only - make sure prerequisites are updated, and descend
526# in scripts/kconfig to make the *config target
527
528# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
529# KBUILD_DEFCONFIG may point out an alternative default configuration
530# used for 'make defconfig'
a436bb7b 531include arch/$(SRCARCH)/Makefile
315bab4e 532export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
1da177e4 533
31110ebb 534config: scripts_basic outputmakefile FORCE
31110ebb
SR
535 $(Q)$(MAKE) $(build)=scripts/kconfig $@
536
537%config: scripts_basic outputmakefile FORCE
1da177e4
LT
538 $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540else
541# ===========================================================================
542# Build targets only - this includes vmlinux, arch specific targets, clean
543# targets and others. In general all targets except *config targets.
544
2c1f4f12
MY
545# If building an external module we do not care about the all: rule
546# but instead _all depend on modules
547PHONY += all
548ifeq ($(KBUILD_EXTMOD),)
549_all: all
550else
551_all: modules
552endif
553
554# Decide whether to build built-in, modular, or both.
555# Normally, just do built-in.
556
557KBUILD_MODULES :=
558KBUILD_BUILTIN := 1
559
560# If we have only "make modules", don't compile built-in objects.
561# When we're building modules with modversions, we need to consider
562# the built-in objects during the descend as well, in order to
563# make sure the checksums are up to date before we record them.
564
565ifeq ($(MAKECMDGOALS),modules)
566 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
567endif
568
569# If we have "make <whatever> modules", compile modules
570# in addition to whatever we do anyway.
571# Just "make" or "make all" shall build modules as well
572
573ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
574 KBUILD_MODULES := 1
575endif
576
577ifeq ($(MAKECMDGOALS),)
578 KBUILD_MODULES := 1
579endif
580
581export KBUILD_MODULES KBUILD_BUILTIN
582
1da177e4 583ifeq ($(KBUILD_EXTMOD),)
1da177e4
LT
584# Objects we will link into vmlinux / subdirs we need to visit
585init-y := init/
df85b2d7 586drivers-y := drivers/ sound/ firmware/
1da177e4
LT
587net-y := net/
588libs-y := lib/
589core-y := usr/
37d9fe47 590virt-y := virt/
1da177e4
LT
591endif # KBUILD_EXTMOD
592
593ifeq ($(dot-config),1)
0a16d2e8 594include include/config/auto.conf
315bab4e
MY
595endif
596
597# The all: target is the default when no target is given on the
598# command line.
599# This allow a user to issue only 'make' to build a kernel including modules
600# Defaults to vmlinux, but the arch makefile usually adds further targets
601all: vmlinux
602
603CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
604 $(call cc-option,-fno-tree-loop-im) \
605 $(call cc-disable-warning,maybe-uninitialized,)
5aadfdeb 606export CFLAGS_GCOV
315bab4e 607
b1f4ff74
PZ
608# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
609ifdef CONFIG_FUNCTION_TRACER
610 CC_FLAGS_FTRACE := -pg
611endif
612
315bab4e
MY
613# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
614# values of the respective KBUILD_* variables
615ARCH_CPPFLAGS :=
616ARCH_AFLAGS :=
617ARCH_CFLAGS :=
618include arch/$(SRCARCH)/Makefile
1da177e4 619
315bab4e 620ifeq ($(dot-config),1)
d7942413 621ifeq ($(may-sync-config),1)
315bab4e
MY
622# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
623# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
624# because some architectures define CROSS_COMPILE there.
c955ccaf 625-include include/config/auto.conf.cmd
1da177e4 626
1da177e4 627# To avoid any implicit rule to kick in, define an empty command
14cdd3c4 628$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
1da177e4 629
61277981
UM
630# The actual configuration files used during the build are stored in
631# include/generated/ and include/config/. Update them if .config is newer than
632# include/config/auto.conf (which mirrors .config).
bc081dd6 633include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
911a91c3 634 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
3041e47e 635else
d7942413
MY
636# External modules and some install targets need include/generated/autoconf.h
637# and include/config/auto.conf but do not care if they are up-to-date.
638# Use auto.conf to trigger the test
9ee4e336
SR
639PHONY += include/config/auto.conf
640
641include/config/auto.conf:
264a2683 642 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
5369f550
MM
643 echo >&2; \
644 echo >&2 " ERROR: Kernel configuration is invalid."; \
645 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
646 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
647 echo >&2 ; \
9ee4e336
SR
648 /bin/false)
649
d7942413 650endif # may-sync-config
9ee4e336 651endif # $(dot-config)
1da177e4 652
a1c48bb1 653KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
ef6000b4 654KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
bd664f6b
LT
655KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
656KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
657KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
a1c48bb1 658
1da177e4 659ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
6748cb3c
BW
660KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
661KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
1da177e4 662else
815eb71e 663ifdef CONFIG_PROFILE_ALL_BRANCHES
a76bcf55 664KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
815eb71e
AB
665else
666KBUILD_CFLAGS += -O2
667endif
1da177e4
LT
668endif
669
a76bcf55
AB
670KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
671 $(call cc-disable-warning,maybe-uninitialized,))
672
69102311
JK
673# Tell gcc to never replace conditional load with a non-conditional one
674KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
675
d677a4d6 676include scripts/Makefile.kcov
6b90bd4b
ER
677include scripts/Makefile.gcc-plugins
678
1873e870
AK
679ifdef CONFIG_READABLE_ASM
680# Disable optimizations that make assembler listings hard to read.
681# reorder blocks reorders the control in the function
682# ipa clone creates specialized cloned functions
683# partial inlining inlines only parts of functions
684KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
685 $(call cc-option,-fno-ipa-cp-clone,) \
686 $(call cc-option,-fno-partial-inlining)
687endif
688
08f67461 689ifneq ($(CONFIG_FRAME_WARN),0)
35bb5b1e
AK
690KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
691endif
692
2a61f474 693stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
050e9baa
LT
694stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
695stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
2a61f474
MY
696
697KBUILD_CFLAGS += $(stackp-flags-y)
e06b8b98 698
076f421d 699ifdef CONFIG_CC_IS_CLANG
cfe17c9b 700KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
cfe17c9b
MY
701KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
702KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
703KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
704# Quiet clang warning: comparison of unsigned expression < 0 is always false
705KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
706# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
707# source of a reference will be _MergedGlobals and not on of the whitelisted names.
708# See modpost pattern 2
709KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
710KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
cfe17c9b
MY
711else
712
713# These warnings generated too much noise in a regular build.
714# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
9df3e7a7 715KBUILD_CFLAGS += -Wno-unused-but-set-variable
cfe17c9b
MY
716endif
717
0a5f4176 718KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
1da177e4 719ifdef CONFIG_FRAME_POINTER
a0f97e06 720KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
1da177e4 721else
7e9501fd
RV
722# Some targets (ARM with Thumb2, for example), can't be built with frame
723# pointers. For those, we don't have FUNCTION_TRACER automatically
724# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
725# incompatible with -fomit-frame-pointer with current GCC, so we don't use
726# -fomit-frame-pointer with FUNCTION_TRACER.
727ifndef CONFIG_FUNCTION_TRACER
a0f97e06 728KBUILD_CFLAGS += -fomit-frame-pointer
1da177e4 729endif
7e9501fd 730endif
1da177e4 731
2062afb4
LT
732KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
733
1da177e4 734ifdef CONFIG_DEBUG_INFO
866ced95
AK
735ifdef CONFIG_DEBUG_INFO_SPLIT
736KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
737else
a0f97e06 738KBUILD_CFLAGS += -g
866ced95 739endif
2288328c 740KBUILD_AFLAGS += -Wa,-gdwarf-2
1da177e4 741endif
bfaf2dd3
AK
742ifdef CONFIG_DEBUG_INFO_DWARF4
743KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
744endif
1da177e4 745
d6f4ceb7 746ifdef CONFIG_DEBUG_INFO_REDUCED
e82c4bb8
AK
747KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
748 $(call cc-option,-fno-var-tracking)
d6f4ceb7
AK
749endif
750
606576ce 751ifdef CONFIG_FUNCTION_TRACER
07d04081
VG
752ifdef CONFIG_FTRACE_MCOUNT_RECORD
753 # gcc 5 supports generating the mcount tables directly
754 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
755 CC_FLAGS_FTRACE += -mrecord-mcount
756 export CC_USING_RECORD_MCOUNT := 1
757 endif
2f4df001
VG
758 ifdef CONFIG_HAVE_NOP_MCOUNT
759 ifeq ($(call cc-option-yn, -mnop-mcount),y)
760 CC_FLAGS_FTRACE += -mnop-mcount
761 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
762 endif
763 endif
07d04081 764endif
a2546fae 765ifdef CONFIG_HAVE_FENTRY
f28bc3c3
VG
766 ifeq ($(call cc-option-yn, -mfentry),y)
767 CC_FLAGS_FTRACE += -mfentry
768 CC_FLAGS_USING += -DCC_USING_FENTRY
769 endif
a2546fae 770endif
f28bc3c3
VG
771export CC_FLAGS_FTRACE
772KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
773KBUILD_AFLAGS += $(CC_FLAGS_USING)
72441cb1 774ifdef CONFIG_DYNAMIC_FTRACE
cf4db259 775 ifdef CONFIG_HAVE_C_RECORDMCOUNT
72441cb1
SR
776 BUILD_C_RECORDMCOUNT := y
777 export BUILD_C_RECORDMCOUNT
778 endif
779endif
16444a8a
ACM
780endif
781
91341d4b
SR
782# We trigger additional mismatches with less inlining
783ifdef CONFIG_DEBUG_SECTION_MISMATCH
784KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
785endif
786
90ad4052 787ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
e85d1d65
MY
788KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
789LDFLAGS_vmlinux += --gc-sections
90ad4052
MY
790endif
791
e8e69931 792# arch Makefile may override CC so keep this after arch Makefile is included
e08d6de4 793NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
e8e69931 794
1da177e4 795# warn about C99 declaration after statement
a33e7ae2 796KBUILD_CFLAGS += -Wdeclaration-after-statement
1da177e4 797
0bb95f80
KC
798# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
799KBUILD_CFLAGS += $(call cc-option,-Wvla)
800
070b98bf 801# disable pointer signed / unsigned warnings in gcc 4.0
fb073a4b 802KBUILD_CFLAGS += -Wno-pointer-sign
1da177e4 803
217c3e01
SR
804# disable stringop warnings in gcc 8+
805KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
806
fe8d0a41 807# disable invalid "can't wrap" optimizations for signed / pointers
a137802e 808KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
d0115552 809
87e0d4f0
DB
810# clang sets -fmerge-all-constants by default as optimization, but this
811# is non-conforming behavior for C and in fact breaks the kernel, so we
812# need to disable it here generally.
813KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
814
815# for gcc -fno-merge-all-constants disables everything, but it is fine
816# to have actual conforming behavior enabled.
817KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
818
3ce120b1
LT
819# Make sure -fstack-check isn't enabled (like gentoo apparently did)
820KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
821
8f7f5c9f
AK
822# conserve stack if available
823KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
824
fe7c36c7
JT
825# Prohibit date/time macros, which would make the build non-deterministic
826KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
827
ea8daa7b
DW
828# enforce correct pointer usage
829KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
830
c834f0e8
KC
831# Require designated initializers for all marked structures
832KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
833
a73619a8
MY
834# change __FILE__ to the relative path from the srctree
835KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
836
40df759e
MM
837# use the deterministic mode of AR if available
838KBUILD_ARFLAGS := $(call ar-option,D)
839
a436bb7b
MY
840include scripts/Makefile.kasan
841include scripts/Makefile.extrawarn
c6d30853 842include scripts/Makefile.ubsan
a86fe353 843
61754c18
MM
844# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
845# last assignments
846KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
847KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
848KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
52bcc330 849
18991197 850# Use --build-id when available.
0da4fabd 851LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
6588169d 852KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
18991197
RM
853LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
854
5d7d18f5 855ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
d79a2719 856LDFLAGS_vmlinux += $(call ld-option, -X,)
5d7d18f5
DH
857endif
858
14516765
LVO
859# insure the checker run with the right endianness
860CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
861
1f2f01b1
LVO
862# the checker needs the correct machine size
863CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
864
1da177e4 865# Default kernel image to build when no specific target is given.
070b98bf 866# KBUILD_IMAGE may be overruled on the command line or
1da177e4
LT
867# set in the environment
868# Also any assignments in arch/$(ARCH)/Makefile take precedence over
869# this default value
870export KBUILD_IMAGE ?= vmlinux
871
872#
873# INSTALL_PATH specifies where to place the updated kernel and system map
874# images. Default is /boot, but you can set it to other values
875export INSTALL_PATH ?= /boot
876
f4d4ffc0
JC
877#
878# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
879# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
880# an argument if needed. Otherwise it defaults to the kernel install path
881#
882export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
883
1da177e4
LT
884#
885# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
886# relocations required by build roots. This is not defined in the
070b98bf 887# makefile but the argument can be passed to make if needed.
1da177e4
LT
888#
889
df9df036 890MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1da177e4
LT
891export MODLIB
892
ac031f26 893#
3fbb43df
MY
894# INSTALL_MOD_STRIP, if defined, will cause modules to be
895# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
896# the default option --strip-debug will be used. Otherwise,
897# INSTALL_MOD_STRIP value will be used as the options to the strip command.
2ea03891 898
ac031f26
TT
899ifdef INSTALL_MOD_STRIP
900ifeq ($(INSTALL_MOD_STRIP),1)
2ea03891 901mod_strip_cmd = $(STRIP) --strip-debug
ac031f26 902else
2ea03891 903mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
ac031f26
TT
904endif # INSTALL_MOD_STRIP=1
905else
2ea03891 906mod_strip_cmd = true
ac031f26
TT
907endif # INSTALL_MOD_STRIP
908export mod_strip_cmd
909
beb50df3
BJ
910# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
911# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
912# or CONFIG_MODULE_COMPRESS_XZ.
913
914mod_compress_cmd = true
915ifdef CONFIG_MODULE_COMPRESS
916 ifdef CONFIG_MODULE_COMPRESS_GZIP
3d1450d5 917 mod_compress_cmd = gzip -n -f
beb50df3
BJ
918 endif # CONFIG_MODULE_COMPRESS_GZIP
919 ifdef CONFIG_MODULE_COMPRESS_XZ
3d1450d5 920 mod_compress_cmd = xz -f
beb50df3
BJ
921 endif # CONFIG_MODULE_COMPRESS_XZ
922endif # CONFIG_MODULE_COMPRESS
923export mod_compress_cmd
924
1bf49dd4 925# Select initial ramdisk compression format, default is gzip(1).
926# This shall be used by the dracut(8) tool while creating an initramfs image.
927#
7ac18156
JB
928INITRD_COMPRESS-y := gzip
929INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
930INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
931INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
932INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
933INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
b7000ade
LT
934# do not export INITRD_COMPRESS, since we didn't actually
935# choose a sane default compression above.
936# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1da177e4 937
d9d8d7ed 938ifdef CONFIG_MODULE_SIG_ALL
3ee550f1
DW
939$(eval $(call config_filename,MODULE_SIG_KEY))
940
941mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
e2a666d5
RR
942else
943mod_sign_cmd = true
944endif
945export mod_sign_cmd
946
9f0c18ae
JP
947ifdef CONFIG_STACK_VALIDATION
948 has_libelf := $(call try-run,\
949 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
950 ifeq ($(has_libelf),1)
951 objtool_target := tools/objtool FORCE
952 else
9f0c18ae
JP
953 SKIP_STACK_VALIDATION := 1
954 export SKIP_STACK_VALIDATION
955 endif
956endif
957
e2a666d5 958
1da177e4 959ifeq ($(KBUILD_EXTMOD),)
cfc411e7 960core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1da177e4
LT
961
962vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
963 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
37d9fe47 964 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1da177e4
LT
965
966vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
37d9fe47 967 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1da177e4 968
f49821ee
NP
969init-y := $(patsubst %/, %/built-in.a, $(init-y))
970core-y := $(patsubst %/, %/built-in.a, $(core-y))
971drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
972net-y := $(patsubst %/, %/built-in.a, $(net-y))
1da177e4 973libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
f49821ee
NP
974libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
975virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1da177e4 976
1f2bfbd0 977# Externally visible symbols (used by link-vmlinux.sh)
95698570 978export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
3a166fc2
NP
979export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
980export KBUILD_VMLINUX_LIBS := $(libs-y1)
95698570 981export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1f2bfbd0 982export LDFLAGS_vmlinux
312a3d09 983# used by scripts/package/Makefile
37d9fe47 984export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
9bb48247 985
3a166fc2 986vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
1da177e4 987
3fdc7d3f
MY
988# Recurse until adjust_autoksyms.sh is satisfied
989PHONY += autoksyms_recursive
990autoksyms_recursive: $(vmlinux-deps)
2441e78b 991ifdef CONFIG_TRIM_UNUSED_KSYMS
ba79d401 992 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
86556392 993 "$(MAKE) -f $(srctree)/Makefile vmlinux"
2441e78b 994endif
23121ca2 995
1f50b80a
MY
996# For the kernel to actually contain only the needed exported symbols,
997# we have to build modules as well to determine what those symbols are.
998# (this can be evaluated only once include/config/auto.conf has been included)
999ifdef CONFIG_TRIM_UNUSED_KSYMS
1000 KBUILD_MODULES := 1
1001endif
1002
07a422bb
MY
1003autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1004
1005$(autoksyms_h):
1006 $(Q)mkdir -p $(dir $@)
1007 $(Q)touch $@
23121ca2 1008
fbe6e37d
NP
1009ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1010
1011# Final link of vmlinux with optional arch pass after final link
312a3d09 1012cmd_link-vmlinux = \
d503ac53 1013 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
fbe6e37d 1014 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
2441e78b 1015
3fdc7d3f 1016vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
3fdc7d3f
MY
1017ifdef CONFIG_GDB_SCRIPTS
1018 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1019endif
1f2bfbd0 1020 +$(call if_changed,link-vmlinux)
741f98fe 1021
392885ee
MY
1022targets := vmlinux
1023
3fca1700 1024# Build samples along the rest of the kernel. This needs headers_install.
dd92478a
NP
1025ifdef CONFIG_SAMPLES
1026vmlinux-dirs += samples
3fca1700 1027samples: headers_install
dd92478a
NP
1028endif
1029
38385f8f 1030# The actual objects are generated when descending,
1da177e4 1031# make sure no implicit rule kicks in
1f2bfbd0 1032$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1da177e4
LT
1033
1034# Handle descending into subdirectories listed in $(vmlinux-dirs)
1035# Preset locale variables to speed up the build process. Limit locale
1036# tweaks to this spot to avoid wrong language settings when running
1037# make menuconfig etc.
1038# Error messages still appears in the original language
1039
4f193362 1040PHONY += $(vmlinux-dirs)
059bc9fc 1041$(vmlinux-dirs): prepare
f7adc312 1042 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1da177e4 1043
ba97df45 1044filechk_kernel.release = \
0d0e7718 1045 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
0d0e7718 1046
83a35e36 1047# Store (new) KERNELRELEASE string in include/config/kernel.release
2063945f 1048include/config/kernel.release: $(srctree)/Makefile FORCE
0d0e7718 1049 $(call filechk,kernel.release)
cb58455c 1050
d8821622
MY
1051# Additional helpers built in scripts/
1052# Carefully list dependencies so we do not try to build scripts twice
1053# in parallel
1054PHONY += scripts
60df1aee 1055scripts: scripts_basic scripts_dtc
d8821622 1056 $(Q)$(MAKE) $(build)=$(@)
cb58455c 1057
1da177e4 1058# Things we need to do before we recursively start building the kernel
5bb78269
SR
1059# or the modules are listed in "prepare".
1060# A multi level approach is used. prepareN is processed before prepareN-1.
1061# archprepare is used in arch Makefiles and when processed asm symlink,
1062# version.h and scripts_basic is processed / created.
1da177e4 1063
5bb78269 1064# Listed in dependency order
6ac38934 1065PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
5bb78269 1066
86feeaa8 1067# prepare3 is used to check if we are building in a separate output directory,
1da177e4
LT
1068# and if so do:
1069# 1) Check that make has not been executed in the kernel src $(srctree)
f1d28fb0 1070prepare3: include/config/kernel.release
1da177e4 1071ifneq ($(KBUILD_SRC),)
fd54f502 1072 @$(kecho) ' Using $(srctree) as source for kernel'
c955ccaf 1073 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
5369f550
MM
1074 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1075 echo >&2 " in the '$(srctree)' directory.";\
1da177e4
LT
1076 /bin/false; \
1077 fi;
1da177e4
LT
1078endif
1079
c965b105
KC
1080# prepare2 creates a makefile if using a separate output directory.
1081# From this point forward, .config has been reprocessed, so any rules
1082# that need to depend on updated CONFIG_* values can be checked here.
2a61f474 1083prepare2: prepare3 outputmakefile asm-generic
1da177e4 1084
2063945f 1085prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h
7bb9d092 1086 $(cmd_crmodverdir)
1da177e4 1087
668c35f6 1088archprepare: archheaders archscripts prepare1 scripts
5bb78269 1089
65bba042 1090prepare0: archprepare
60df1aee 1091 $(Q)$(MAKE) $(build)=scripts/mod
8d36a623 1092 $(Q)$(MAKE) $(build)=.
86feeaa8 1093
1da177e4 1094# All the preparing..
b9ab5ebb
JP
1095prepare: prepare0 prepare-objtool
1096
2c1f4f12 1097# Support for using generic headers in asm-generic
7d0e5c20
MY
1098asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1099
2c1f4f12
MY
1100PHONY += asm-generic uapi-asm-generic
1101asm-generic: uapi-asm-generic
7d0e5c20 1102 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm
2c1f4f12 1103uapi-asm-generic:
7d0e5c20 1104 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm
2c1f4f12 1105
b9ab5ebb 1106PHONY += prepare-objtool
3b27a0c8 1107prepare-objtool: $(objtool_target)
ef7cfd00
MY
1108ifeq ($(SKIP_STACK_VALIDATION),1)
1109ifdef CONFIG_UNWINDER_ORC
1110 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1111 @false
1112else
1113 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1114endif
1115endif
1da177e4 1116
1da177e4
LT
1117# Generate some files
1118# ---------------------------------------------------------------------------
1119
1120# KERNELRELEASE can change from a few different places, meaning version.h
1121# needs to be updated, so this check is forced on all builds
1122
1123uts_len := 64
63104eec
SR
1124define filechk_utsrelease.h
1125 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1126 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1127 exit 1; \
1128 fi; \
ad774086 1129 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
63104eec 1130endef
1da177e4
LT
1131
1132define filechk_version.h
ad774086 1133 echo \#define LINUX_VERSION_CODE $(shell \
450c6076 1134 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
ad774086 1135 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1da177e4
LT
1136endef
1137
43fee2b2 1138$(version_h): FORCE
1da177e4 1139 $(call filechk,version.h)
223c24a7 1140 $(Q)rm -f $(old_version_h)
1da177e4 1141
273b281f 1142include/generated/utsrelease.h: include/config/kernel.release FORCE
63104eec
SR
1143 $(call filechk,utsrelease.h)
1144
179efcb4
VN
1145PHONY += headerdep
1146headerdep:
9663d989
PF
1147 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1148 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
179efcb4 1149
8d730cfb
DW
1150# ---------------------------------------------------------------------------
1151# Kernel headers
8d730cfb 1152
e6883b18
SR
1153#Default location for installed headers
1154export INSTALL_HDR_PATH = $(objtree)/usr
6d716275 1155
9d022c54
MY
1156# If we do an all arch process set dst to include/arch-$(SRCARCH)
1157hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
e6883b18 1158
f7de64b7 1159PHONY += archheaders archscripts
6520fe55 1160
e6883b18 1161PHONY += __headers
a9d9a400 1162__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
e1b702cf 1163 $(Q)$(MAKE) $(build)=scripts build_unifdef
e6883b18
SR
1164
1165PHONY += headers_install_all
2fb9b1bd
SR
1166headers_install_all:
1167 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
6d716275 1168
8d730cfb 1169PHONY += headers_install
e6883b18 1170headers_install: __headers
9d022c54 1171 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
10b63956 1172 $(error Headers not exportable for the $(SRCARCH) architecture))
a8ff49a1 1173 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
9d022c54 1174 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
8d730cfb 1175
1f85712e
MF
1176PHONY += headers_check_all
1177headers_check_all: headers_install_all
2fb9b1bd 1178 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1f85712e 1179
68475359
DW
1180PHONY += headers_check
1181headers_check: headers_install
a8ff49a1 1182 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
9d022c54 1183 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
68475359 1184
257edce6
MY
1185ifdef CONFIG_HEADERS_CHECK
1186all: headers_check
1187endif
1188
5a5da78b
SK
1189# ---------------------------------------------------------------------------
1190# Kernel selftest
1191
1192PHONY += kselftest
1193kselftest:
2bc84526 1194 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
5a5da78b 1195
801d2e9f 1196PHONY += kselftest-clean
dcb825a9 1197kselftest-clean:
2bc84526 1198 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
dcb825a9 1199
3d6dee7a
BJZ
1200PHONY += kselftest-merge
1201kselftest-merge:
1202 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1203 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1204 -m $(objtree)/.config \
1205 $(srctree)/tools/testing/selftests/*/config
1206 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1207
37c8a5fa
RH
1208# ---------------------------------------------------------------------------
1209# Devicetree files
1210
1211ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1212dtstree := arch/$(SRCARCH)/boot/dts
1213endif
1214
1215ifneq ($(dtstree),)
1216
1217%.dtb: prepare3 scripts_dtc
1218 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1219
4f0e3a57
RH
1220PHONY += dtbs dtbs_install dt_binding_check
1221dtbs dtbs_check: prepare3 scripts_dtc
37c8a5fa
RH
1222 $(Q)$(MAKE) $(build)=$(dtstree)
1223
4f0e3a57
RH
1224dtbs_check: export CHECK_DTBS=1
1225dtbs_check: dt_binding_check
1226
37c8a5fa
RH
1227dtbs_install:
1228 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1229
1230ifdef CONFIG_OF_EARLY_FLATTREE
1231all: dtbs
1232endif
1233
1234endif
1235
1236PHONY += scripts_dtc
1237scripts_dtc: scripts_basic
1238 $(Q)$(MAKE) $(build)=scripts/dtc
1239
4f0e3a57
RH
1240dt_binding_check: scripts_dtc
1241 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1242
1da177e4
LT
1243# ---------------------------------------------------------------------------
1244# Modules
1245
1246ifdef CONFIG_MODULES
1247
070b98bf 1248# By default, build modules as well
1da177e4 1249
73d1393e 1250all: modules
1da177e4 1251
3fbb43df 1252# Build modules
551559e1 1253#
3fbb43df
MY
1254# A module can be listed more than once in obj-m resulting in
1255# duplicate lines in modules.order files. Those are removed
1256# using awk while concatenating to the final file.
1da177e4 1257
4f193362 1258PHONY += modules
2da30e70 1259modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
551559e1 1260 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
fd54f502 1261 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1262 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1da177e4 1263
a6c36632
MM
1264modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1265 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1266
2063945f 1267%/modules.builtin: include/config/auto.conf include/config/tristate.conf
a6c36632
MM
1268 $(Q)$(MAKE) $(modbuiltin)=$*
1269
1da177e4
LT
1270
1271# Target to prepare building external modules
4f193362 1272PHONY += modules_prepare
059bc9fc 1273modules_prepare: prepare
1da177e4
LT
1274
1275# Target to install modules
4f193362 1276PHONY += modules_install
1da177e4
LT
1277modules_install: _modinst_ _modinst_post
1278
4f193362 1279PHONY += _modinst_
2da30e70 1280_modinst_:
1da177e4
LT
1281 @rm -rf $(MODLIB)/kernel
1282 @rm -f $(MODLIB)/source
1283 @mkdir -p $(MODLIB)/kernel
8e9b4667 1284 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1da177e4
LT
1285 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1286 rm -f $(MODLIB)/build ; \
7e1c0477 1287 ln -s $(CURDIR) $(MODLIB)/build ; \
1da177e4 1288 fi
551559e1 1289 @cp -f $(objtree)/modules.order $(MODLIB)/
bc081dd6 1290 @cp -f $(objtree)/modules.builtin $(MODLIB)/
b805aa0e 1291 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1292
50a8ec31 1293# This depmod is only for convenience to give the initial
1da177e4
LT
1294# boot a modules.dep even before / is mounted read-write. However the
1295# boot script depmod is the master version.
4f193362 1296PHONY += _modinst_post
6d128e1e 1297_modinst_post: _modinst_
50a8ec31 1298 $(call cmd,depmod)
1da177e4 1299
d890f510
JB
1300ifeq ($(CONFIG_MODULE_SIG), y)
1301PHONY += modules_sign
1302modules_sign:
1303 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1304endif
1305
1da177e4
LT
1306else # CONFIG_MODULES
1307
1308# Modules not configured
1309# ---------------------------------------------------------------------------
1310
612e47ce
MY
1311PHONY += modules modules_install
1312modules modules_install:
5369f550
MM
1313 @echo >&2
1314 @echo >&2 "The present kernel configuration has modules disabled."
1315 @echo >&2 "Type 'make config' and enable loadable module support."
1316 @echo >&2 "Then build a kernel with module support enabled."
1317 @echo >&2
1da177e4
LT
1318 @exit 1
1319
1320endif # CONFIG_MODULES
1321
1da177e4
LT
1322###
1323# Cleaning is done on three levels.
1324# make clean Delete most generated files
1325# Leave enough to build external modules
1326# make mrproper Delete the current configuration, and all generated files
1327# make distclean Remove editor backup files, patch leftover files and the like
1328
1329# Directories & files removed with 'make clean'
fbfa9be9 1330CLEAN_DIRS += $(MODVERDIR) include/ksym
1da177e4
LT
1331
1332# Directories & files removed with 'make mrproper'
d8ecc5cd 1333MRPROPER_DIRS += include/config usr/include include/generated \
3fbb43df 1334 arch/*/include/generated .tmp_objdiff
278ae604 1335MRPROPER_FILES += .config .config.old .version \
d5b71936 1336 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
fb117949
DW
1337 signing_key.pem signing_key.priv signing_key.x509 \
1338 x509.genkey extra_certificates signing_key.x509.keyid \
3ee7b3fa 1339 signing_key.x509.signer vmlinux-gdb.py
1da177e4
LT
1340
1341# clean - Delete most, but leave enough to build external modules
1342#
1343clean: rm-dirs := $(CLEAN_DIRS)
1344clean: rm-files := $(CLEAN_FILES)
fb68d4be 1345clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1da177e4 1346
bd1ee804 1347PHONY += $(clean-dirs) clean archclean vmlinuxclean
1da177e4
LT
1348$(clean-dirs):
1349 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1350
bd1ee804
PM
1351vmlinuxclean:
1352 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
fbe6e37d 1353 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
bd1ee804
PM
1354
1355clean: archclean vmlinuxclean
1da177e4
LT
1356
1357# mrproper - Delete all generated files, including .config
1358#
1359mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1360mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
cb43fb57 1361mrproper-dirs := $(addprefix _mrproper_,scripts)
1da177e4 1362
4f193362 1363PHONY += $(mrproper-dirs) mrproper archmrproper
1da177e4
LT
1364$(mrproper-dirs):
1365 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1366
1367mrproper: clean archmrproper $(mrproper-dirs)
1368 $(call cmd,rmdirs)
1369 $(call cmd,rmfiles)
1370
1371# distclean
1372#
4f193362 1373PHONY += distclean
1da177e4
LT
1374
1375distclean: mrproper
1376 @find $(srctree) $(RCS_FIND_IGNORE) \
070b98bf 1377 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
f78271df
MY
1378 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1379 -o -name 'core' \) \
1da177e4
LT
1380 -type f -print | xargs rm -f
1381
1382
1383# Packaging of the kernel to various formats
1384# ---------------------------------------------------------------------------
c79624c1 1385package-dir := scripts/package
1da177e4 1386
bafb6747
ACM
1387%src-pkg: FORCE
1388 $(Q)$(MAKE) $(build)=$(package-dir) $@
031ecc6d 1389%pkg: include/config/kernel.release FORCE
6c2133e1 1390 $(Q)$(MAKE) $(build)=$(package-dir) $@
1da177e4
LT
1391
1392
1393# Brief documentation of the typical targets used
1394# ---------------------------------------------------------------------------
1395
5dffbe81 1396boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
a1e7b7bb 1397boards := $(sort $(notdir $(boards)))
5dffbe81
SB
1398board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1399board-dirs := $(sort $(notdir $(board-dirs:/=)))
1da177e4 1400
fe69b420 1401PHONY += help
1da177e4
LT
1402help:
1403 @echo 'Cleaning targets:'
5ea084ef 1404 @echo ' clean - Remove most generated files but keep the config and'
5cc8d246 1405 @echo ' enough build support to build external modules'
5ea084ef 1406 @echo ' mrproper - Remove all generated files + config + various backup files'
5cc8d246 1407 @echo ' distclean - mrproper + remove editor backup and patch files'
1da177e4
LT
1408 @echo ''
1409 @echo 'Configuration targets:'
1410 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1411 @echo ''
1412 @echo 'Other generic targets:'
1413 @echo ' all - Build all targets marked with [*]'
1414 @echo '* vmlinux - Build the bare kernel'
1415 @echo '* modules - Build all modules'
9cc5d74c 1416 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1da177e4 1417 @echo ' dir/ - Build all files in dir and below'
40ab87a4 1418 @echo ' dir/file.[ois] - Build specified target only'
433db3e2
VT
1419 @echo ' dir/file.ll - Build the LLVM assembly file'
1420 @echo ' (requires compiler support for LLVM assembly generation)'
62718979
JP
1421 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1422 @echo ' (requires a recent binutils and recent build (System.map))'
155ad605 1423 @echo ' dir/file.ko - Build module including final link'
c4d5ee67 1424 @echo ' modules_prepare - Set up for building external modules'
1da177e4
LT
1425 @echo ' tags/TAGS - Generate tags file for editors'
1426 @echo ' cscope - Generate cscope index'
f4ed1009 1427 @echo ' gtags - Generate GNU GLOBAL index'
3f1d9a6c
MM
1428 @echo ' kernelrelease - Output the release version string (use with make -s)'
1429 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1430 @echo ' image_name - Output the image name (use with make -s)'
2fb9b1bd 1431 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
59df3230 1432 echo ' (default: $(INSTALL_HDR_PATH))'; \
2fb9b1bd 1433 echo ''
31b8cc80 1434 @echo 'Static analysers:'
1da177e4
LT
1435 @echo ' checkstack - Generate a list of stack hogs'
1436 @echo ' namespacecheck - Name space analysis on compiled kernel'
aa025e7d 1437 @echo ' versioncheck - Sanity check on version.h usage'
ec2d987f 1438 @echo ' includecheck - Check for duplicate included header files'
295ac051 1439 @echo ' export_report - List the usages of all exported symbols'
179efcb4 1440 @echo ' headers_check - Sanity check on exported headers'
74425eee 1441 @echo ' headerdep - Detect inclusion cycles in headers'
7f855fc8 1442 @echo ' coccicheck - Check with Coccinelle'
74425eee 1443 @echo ''
31b8cc80 1444 @echo 'Kernel selftest:'
5a5da78b
SK
1445 @echo ' kselftest - Build and run kernel selftest (run as root)'
1446 @echo ' Build, install, and boot kernel before'
1447 @echo ' running kselftest on it'
dcb825a9 1448 @echo ' kselftest-clean - Remove all generated kselftest files'
bbfe63b6 1449 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
3d6dee7a 1450 @echo ' .config.'
5a5da78b 1451 @echo ''
37c8a5fa
RH
1452 @$(if $(dtstree), \
1453 echo 'Devicetree:'; \
1454 echo '* dtbs - Build device tree blobs for enabled boards'; \
1455 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1456 echo '')
1457
31b8cc80
RD
1458 @echo 'Userspace tools targets:'
1459 @echo ' use "make tools/help"'
1460 @echo ' or "cd tools; make help"'
1461 @echo ''
1da177e4 1462 @echo 'Kernel packaging:'
6c2133e1 1463 @$(MAKE) $(build)=$(package-dir) help
1da177e4
LT
1464 @echo ''
1465 @echo 'Documentation targets:'
cb43fb57 1466 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1da177e4 1467 @echo ''
01dee188 1468 @echo 'Architecture specific targets ($(SRCARCH)):'
1da177e4 1469 @$(if $(archhelp),$(archhelp),\
01dee188 1470 echo ' No architecture specific help defined for $(SRCARCH)')
1da177e4
LT
1471 @echo ''
1472 @$(if $(boards), \
1473 $(foreach b, $(boards), \
1474 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1475 echo '')
5dffbe81
SB
1476 @$(if $(board-dirs), \
1477 $(foreach b, $(board-dirs), \
1478 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1479 printf " %-16s - Show all of the above\\n" help-boards; \
1480 echo '')
1da177e4
LT
1481
1482 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
45d506bd 1483 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1da177e4 1484 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
9ba26a72 1485 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
701842e3 1486 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
af07ce3e 1487 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
28bc20dc
SR
1488 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1489 @echo ' 1: warnings which may be relevant and do not occur too often'
1490 @echo ' 2: warnings which occur quite often but may still be relevant'
1491 @echo ' 3: more obscure warnings, can most likely be ignored'
a6de553d 1492 @echo ' Multiple levels can be combined with W=12 or W=123'
1da177e4
LT
1493 @echo ''
1494 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1495 @echo 'For further info see the ./README file'
1496
1497
5dffbe81
SB
1498help-board-dirs := $(addprefix help-,$(board-dirs))
1499
1500help-boards: $(help-board-dirs)
1501
fbae4d58 1502boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
5dffbe81
SB
1503
1504$(help-board-dirs): help-%:
1505 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1506 @$(if $(boards-per-dir), \
1507 $(foreach b, $(boards-per-dir), \
1508 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1509 echo '')
1510
1511
1da177e4
LT
1512# Documentation targets
1513# ---------------------------------------------------------------------------
e8939222
JN
1514DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1515 linkcheckdocs dochelp refcheckdocs
22cba31b
JN
1516PHONY += $(DOC_TARGETS)
1517$(DOC_TARGETS): scripts_basic FORCE
cb43fb57 1518 $(Q)$(MAKE) $(build)=Documentation $@
1da177e4
LT
1519
1520else # KBUILD_EXTMOD
1521
1522###
1523# External module support.
1524# When building external modules the kernel used as basis is considered
1525# read-only, and no consistency checks are made and the make
1526# system is not used on the basis kernel. If updates are required
1527# in the basis kernel ordinary make commands (without M=...) must
1528# be used.
1529#
1530# The following are the only valid targets when building external
1531# modules.
1532# make M=dir clean Delete all automatically generated files
1533# make M=dir modules Make all modules in specified dir
1534# make M=dir Same as 'make M=dir modules'
1535# make M=dir modules_install
070b98bf 1536# Install the modules built in the module directory
1da177e4
LT
1537# Assumes install directory is already created
1538
1539# We are always building modules
1540KBUILD_MODULES := 1
1da177e4 1541
4f193362 1542PHONY += $(objtree)/Module.symvers
1da177e4
LT
1543$(objtree)/Module.symvers:
1544 @test -e $(objtree)/Module.symvers || ( \
1545 echo; \
1546 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1547 echo " is missing; modules will have no dependencies and modversions."; \
1548 echo )
1549
1550module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
4f193362 1551PHONY += $(module-dirs) modules
e07db28e 1552$(module-dirs): prepare $(objtree)/Module.symvers
1da177e4
LT
1553 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1554
1555modules: $(module-dirs)
fd54f502 1556 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1557 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1da177e4 1558
4f193362 1559PHONY += modules_install
a67dc21a 1560modules_install: _emodinst_ _emodinst_post
e6304663 1561
4f193362
PS
1562install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1563PHONY += _emodinst_
a67dc21a 1564_emodinst_:
a67dc21a 1565 $(Q)mkdir -p $(MODLIB)/$(install-dir)
b805aa0e 1566 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1567
4f193362 1568PHONY += _emodinst_post
a67dc21a
SR
1569_emodinst_post: _emodinst_
1570 $(call cmd,depmod)
1571
1da177e4
LT
1572clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1573
4f193362 1574PHONY += $(clean-dirs) clean
1da177e4
LT
1575$(clean-dirs):
1576 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1577
1578clean: rm-dirs := $(MODVERDIR)
88d7be03 1579clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1da177e4 1580
fe69b420 1581PHONY += help
1da177e4
LT
1582help:
1583 @echo ' Building external modules.'
1584 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1585 @echo ''
1586 @echo ' modules - default target, build the module(s)'
1587 @echo ' modules_install - install the module'
1588 @echo ' clean - remove generated files in module directory only'
1589 @echo ''
06300b21 1590
059bc9fc 1591PHONY += prepare
e07db28e
MY
1592prepare:
1593 $(cmd_crmodverdir)
1da177e4
LT
1594endif # KBUILD_EXTMOD
1595
88d7be03
MM
1596clean: $(clean-dirs)
1597 $(call cmd,rmdirs)
1598 $(call cmd,rmfiles)
43f67c98 1599 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
ef46d9b3 1600 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
4f0e3a57
RH
1601 -o -name '*.ko.*' \
1602 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
ef46d9b3 1603 -o -name '*.dwo' -o -name '*.lst' \
d523b255 1604 -o -name '*.su' \
88d7be03 1605 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
9a8dfb39 1606 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
4fa8bc94 1607 -o -name '*.asn1.[ch]' \
88d7be03
MM
1608 -o -name '*.symtypes' -o -name 'modules.order' \
1609 -o -name modules.builtin -o -name '.tmp_*.o.*' \
6b90bd4b 1610 -o -name '*.c.[012]*.*' \
433db3e2 1611 -o -name '*.ll' \
88d7be03
MM
1612 -o -name '*.gcno' \) -type f -print | xargs rm -f
1613
1da177e4
LT
1614# Generate tags for editors
1615# ---------------------------------------------------------------------------
a680eedc
SR
1616quiet_cmd_tags = GEN $@
1617 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1da177e4 1618
f4ed1009 1619tags TAGS cscope gtags: FORCE
1da177e4
LT
1620 $(call cmd,tags)
1621
1da177e4
LT
1622# Scripts to check various things for consistency
1623# ---------------------------------------------------------------------------
1624
279f3dd3
PF
1625PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1626
1da177e4 1627includecheck:
436f876c 1628 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1629 -name '*.[hcS]' -type f -print | sort \
80007434 1630 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1da177e4
LT
1631
1632versioncheck:
2ee2d292 1633 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1634 -name '*.[hcS]' -type f -print | sort \
80007434 1635 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1da177e4 1636
74425eee
NP
1637coccicheck:
1638 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1639
1da177e4
LT
1640namespacecheck:
1641 $(PERL) $(srctree)/scripts/namespace.pl
1642
295ac051
AB
1643export_report:
1644 $(PERL) $(srctree)/scripts/export_report.pl
1645
c398ff00 1646PHONY += checkstack kernelrelease kernelversion image_name
e3ccf6e3 1647
011e3a9a
JD
1648# UML needs a little special treatment here. It wants to use the host
1649# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1650# else wants $(ARCH), including people doing cross-builds, which means
1651# that $(SUBARCH) doesn't work here.
1652ifeq ($(ARCH), um)
1653CHECKSTACK_ARCH := $(SUBARCH)
1654else
1655CHECKSTACK_ARCH := $(ARCH)
1656endif
1da177e4
LT
1657checkstack:
1658 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
011e3a9a 1659 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1da177e4 1660
7b8ea53d
AW
1661kernelrelease:
1662 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
01ab1788 1663
cb58455c 1664kernelversion:
2244cbd8 1665 @echo $(KERNELVERSION)
1da177e4 1666
c398ff00
MM
1667image_name:
1668 @echo $(KBUILD_IMAGE)
1669
ea01fa9f
BP
1670# Clear a bunch of variables before executing the submake
1671tools/: FORCE
bf35182f 1672 $(Q)mkdir -p $(objtree)/tools
8e9b4667 1673 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
ea01fa9f
BP
1674
1675tools/%: FORCE
bf35182f 1676 $(Q)mkdir -p $(objtree)/tools
8e9b4667 1677 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
ea01fa9f 1678
06300b21
SR
1679# Single targets
1680# ---------------------------------------------------------------------------
bc2546a6 1681# Single targets are compatible with:
e1b8513d 1682# - build with mixed source and output
bc2546a6
SR
1683# - build with separate output dir 'make O=...'
1684# - external modules
1685#
1686# target-dir => where to store outputfile
1687# build-dir => directory in kernel source tree to use
1688
1689ifeq ($(KBUILD_EXTMOD),)
aa360879 1690 build-dir = $(patsubst %/,%,$(dir $@))
bc2546a6
SR
1691 target-dir = $(dir $@)
1692else
1693 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1694 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1695 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1696endif
1697
059bc9fc 1698%.s: %.c prepare FORCE
bc2546a6 1699 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1700%.i: %.c prepare FORCE
bc2546a6 1701 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1702%.o: %.c prepare FORCE
bc2546a6 1703 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1704%.lst: %.c prepare FORCE
bc2546a6 1705 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1706%.s: %.S prepare FORCE
bc2546a6 1707 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1708%.o: %.S prepare FORCE
bc2546a6 1709 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1710%.symtypes: %.c prepare FORCE
15fde675 1711 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
059bc9fc 1712%.ll: %.c prepare FORCE
433db3e2 1713 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
06300b21 1714
bc2546a6 1715# Modules
059bc9fc 1716/: prepare FORCE
31110ebb
SR
1717 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1718 $(build)=$(build-dir)
8e2faea8 1719# Make sure the latest headers are built for Documentation
ddea05fa 1720Documentation/ samples/: headers_install
059bc9fc 1721%/: prepare FORCE
06300b21 1722 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6 1723 $(build)=$(build-dir)
059bc9fc 1724%.ko: prepare FORCE
06300b21 1725 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6 1726 $(build)=$(build-dir) $(@:.ko=.o)
b805aa0e 1727 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
06300b21 1728
38385f8f 1729# FIXME Should go into a make.lib or something
1da177e4
LT
1730# ===========================================================================
1731
1732quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1733 cmd_rmdirs = rm -rf $(rm-dirs)
1734
1735quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1736 cmd_rmfiles = rm -f $(rm-files)
1737
bc3c26fe 1738# Run depmod only if we have System.map and depmod is executable
50a8ec31 1739quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
569658dd 1740 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
5a144a1a 1741 $(KERNELRELEASE)
50a8ec31 1742
7bb9d092 1743# Create temporary dir for module support files
ab19f879
SR
1744# clean it up only when building all modules
1745cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1746 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1da177e4 1747
392885ee
MY
1748# read saved command lines for existing targets
1749existing-targets := $(wildcard $(sort $(targets)))
1da177e4 1750
392885ee
MY
1751cmd_files := $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1752$(cmd_files): ; # Do not try to update included dependency files
1753-include $(cmd_files)
1da177e4 1754
25815cf5
MY
1755endif # ifeq ($(config-targets),1)
1756endif # ifeq ($(mixed-targets),1)
1da177e4
LT
1757endif # skip-makefile
1758
4f193362 1759PHONY += FORCE
1da177e4 1760FORCE:
4f193362 1761
bd412d81 1762# Declare the contents of the PHONY variable as phony. We keep that
fe8d0a41 1763# information in a variable so we can use it in if_changed and friends.
4f193362 1764.PHONY: $(PHONY)