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c517d838 1VERSION = 4
7ce7d89f 2PATCHLEVEL = 10
55922c9d 3SUBLEVEL = 0
c470abd4 4EXTRAVERSION =
566cf877 5NAME = Fearless Coyote
1da177e4
LT
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
a436bb7b
MY
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
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
1da177e4 17
c051346b 18# Avoid funny character set dependencies
06b5dc64 19unexport LC_ALL
c051346b
PA
20LC_COLLATE=C
21LC_NUMERIC=C
07105202 22export LC_COLLATE LC_NUMERIC
c051346b 23
ab7474ea
BP
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
1da177e4
LT
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
066b7ed9
MM
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 $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
1da177e4
LT
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
b8b0618c
CR
69ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
1da177e4
LT
71endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
066b7ed9
MM
76ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
e572d088 90 tools_silent=s
066b7ed9
MM
91endif
92else # make-3.8x
93ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94 quiet=silent_
e572d088 95 tools_silent=-s
066b7ed9
MM
96endif
97endif
98
99export quiet Q KBUILD_VERBOSE
100
1da177e4
LT
101# kbuild supports saving output files in a separate directory.
102# To locate output files in a separate directory two syntaxes are supported.
103# In both cases the working directory must be the root of the kernel src.
104# 1) O=
105# Use "make O=dir/to/store/output/files/"
070b98bf 106#
1da177e4
LT
107# 2) Set KBUILD_OUTPUT
108# Set the environment variable KBUILD_OUTPUT to point to the directory
109# where the output files shall be placed.
110# export KBUILD_OUTPUT=dir/to/store/output/files/
111# make
112#
113# The O= assignment takes precedence over the KBUILD_OUTPUT environment
114# variable.
115
1da177e4
LT
116# KBUILD_SRC is set on invocation of make in OBJ directory
117# KBUILD_SRC is not intended to be used by the regular user (for now)
118ifeq ($(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?
b8b0618c
CR
122ifeq ("$(origin O)", "command line")
123 KBUILD_OUTPUT := $(O)
1da177e4
LT
124endif
125
126# That's our default target when none is given on the command line
4f193362 127PHONY := _all
1da177e4
LT
128_all:
129
1cacc9ab
SR
130# Cancel implicit rules on top Makefile
131$(CURDIR)/Makefile Makefile: ;
132
51193b76
RJ
133ifneq ($(words $(subst :, ,$(CURDIR))), 1)
134 $(error main directory cannot contain spaces nor colons)
135endif
136
1da177e4
LT
137ifneq ($(KBUILD_OUTPUT),)
138# Invoke a second make in the output directory, passing relevant variables
139# check that the output directory actually exists
140saved-output := $(KBUILD_OUTPUT)
1c9e70a5
MY
141KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
142 && /bin/pwd)
1da177e4 143$(if $(KBUILD_OUTPUT),, \
1c9e70a5 144 $(error failed to create output directory "$(saved-output)"))
1da177e4 145
0b35786d
MM
146PHONY += $(MAKECMDGOALS) sub-make
147
1cacc9ab 148$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
16f89098 149 @:
0b35786d 150
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 ($(skip-makefile),)
162
7ff52571
MY
163# Do not print "Entering directory ...",
164# but we want to display it when entering to the output directory
165# so that IDEs/editors are able to understand relative filenames.
166MAKEFLAGS += --no-print-directory
167
aa55c8e2
MY
168# Call a source code checker (by default, "sparse") as part of the
169# C compilation.
170#
171# Use 'make C=1' to enable checking of only re-compiled files.
172# Use 'make C=2' to enable checking of *all* source files, regardless
173# of whether they are re-compiled or not.
174#
175# See the file "Documentation/sparse.txt" for more details, including
176# where to get the "sparse" utility.
177
178ifeq ("$(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
189 KBUILD_EXTMOD ?= $(SUBDIRS)
190endif
191
192ifeq ("$(origin M)", "command line")
193 KBUILD_EXTMOD := $(M)
194endif
195
1da177e4
LT
196# If building an external module we do not care about the all: rule
197# but instead _all depend on modules
4f193362 198PHONY += all
1da177e4
LT
199ifeq ($(KBUILD_EXTMOD),)
200_all: all
201else
202_all: modules
203endif
204
9da0763b
MM
205ifeq ($(KBUILD_SRC),)
206 # building in the source tree
207 srctree := .
208else
209 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
210 # building in a subdirectory of the source tree
211 srctree := ..
212 else
213 srctree := $(KBUILD_SRC)
214 endif
215endif
7e1c0477 216objtree := .
1da177e4
LT
217src := $(srctree)
218obj := $(objtree)
219
0f558c33 220VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
1da177e4 221
11294235 222export srctree objtree VPATH
1da177e4 223
1da177e4
LT
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,
38385f8f 227# then ARCH is assigned, getting whatever value it gets normally, and
1da177e4
LT
228# SUBARCH is subsequently ignored.
229
ffee0de4
DW
230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231 -e s/sun4u/sparc64/ \
1da177e4 232 -e s/arm.*/arm/ -e s/sa110/arm/ \
39990b5e 233 -e s/s390x/s390/ -e s/parisc64/parisc/ \
236b1957 234 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
f1b99392 235 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
1da177e4
LT
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.
84336466
RM
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.
1da177e4
LT
255# Default value for CROSS_COMPILE is not to prefix executables
256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
2331d1a6 257ARCH ?= $(SUBARCH)
84336466 258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
1da177e4
LT
259
260# Architecture as present in compile.h
6752ed90
TG
261UTS_MACHINE := $(ARCH)
262SRCARCH := $(ARCH)
1da177e4 263
d746d647
SR
264# Additional ARCH settings for x86
265ifeq ($(ARCH),i386)
266 SRCARCH := x86
267endif
268ifeq ($(ARCH),x86_64)
269 SRCARCH := x86
270endif
74b469f2 271
5e538790 272# Additional ARCH settings for sparc
e69f58c0
NK
273ifeq ($(ARCH),sparc32)
274 SRCARCH := sparc
275endif
a439fe51 276ifeq ($(ARCH),sparc64)
5e538790 277 SRCARCH := sparc
a439fe51 278endif
2fb9b1bd 279
3cc000b5
PM
280# Additional ARCH settings for sh
281ifeq ($(ARCH),sh64)
282 SRCARCH := sh
283endif
284
18aecc2b 285# Additional ARCH settings for tile
6738d321
CM
286ifeq ($(ARCH),tilepro)
287 SRCARCH := tile
288endif
18aecc2b
CM
289ifeq ($(ARCH),tilegx)
290 SRCARCH := tile
291endif
292
5e538790
SR
293# Where to locate arch specific headers
294hdr-arch := $(SRCARCH)
295
14cdd3c4 296KCONFIG_CONFIG ?= .config
41263fc6 297export KCONFIG_CONFIG
14cdd3c4 298
1da177e4
LT
299# SHELL used by kbuild
300CONFIG_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
070b98bf
SR
304HOSTCC = gcc
305HOSTCXX = g++
51b97e35 306HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
070b98bf 307HOSTCXXFLAGS = -O2
1da177e4 308
61163efa
BW
309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
312endif
313
070b98bf
SR
314# Decide whether to build built-in, modular, or both.
315# Normally, just do built-in.
1da177e4
LT
316
317KBUILD_MODULES :=
318KBUILD_BUILTIN := 1
319
3fbb43df
MY
320# If we have only "make modules", don't compile built-in objects.
321# When we're building modules with modversions, we need to consider
322# the built-in objects during the descend as well, in order to
323# make sure the checksums are up to date before we record them.
1da177e4
LT
324
325ifeq ($(MAKECMDGOALS),modules)
326 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327endif
328
3fbb43df
MY
329# If we have "make <whatever> modules", compile modules
330# in addition to whatever we do anyway.
331# Just "make" or "make all" shall build modules as well
1da177e4
LT
332
333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334 KBUILD_MODULES := 1
335endif
336
337ifeq ($(MAKECMDGOALS),)
338 KBUILD_MODULES := 1
339endif
340
e579d351 341export KBUILD_MODULES KBUILD_BUILTIN
1da177e4
LT
342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343
1cacc9ab 344# We need some generic definitions (do not try to remake the file).
a436bb7b
MY
345scripts/Kbuild.include: ;
346include scripts/Kbuild.include
1da177e4
LT
347
348# Make variables (CC, etc...)
1da177e4
LT
349AS = $(CROSS_COMPILE)as
350LD = $(CROSS_COMPILE)ld
351CC = $(CROSS_COMPILE)gcc
352CPP = $(CC) -E
353AR = $(CROSS_COMPILE)ar
354NM = $(CROSS_COMPILE)nm
355STRIP = $(CROSS_COMPILE)strip
356OBJCOPY = $(CROSS_COMPILE)objcopy
357OBJDUMP = $(CROSS_COMPILE)objdump
358AWK = awk
359GENKSYMS = scripts/genksyms/genksyms
caa27b66 360INSTALLKERNEL := installkernel
1da177e4 361DEPMOD = /sbin/depmod
1da177e4 362PERL = perl
011bf125 363PYTHON = python
1da177e4
LT
364CHECK = sparse
365
80a7d1d9
HE
366CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367 -Wbitwise -Wno-return-void $(CF)
b36fad65 368NOSTDINC_FLAGS =
6588169d
SR
369CFLAGS_MODULE =
370AFLAGS_MODULE =
371LDFLAGS_MODULE =
1da177e4
LT
372CFLAGS_KERNEL =
373AFLAGS_KERNEL =
b36fad65 374LDFLAGS_vmlinux =
a76bcf55 375CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
543c37cb 376CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
1da177e4
LT
377
378
abbf1590
DH
379# Use USERINCLUDE when you must reference the UAPI directories only.
380USERINCLUDE := \
381 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
3308b285 382 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
abbf1590 383 -I$(srctree)/include/uapi \
3308b285 384 -I$(objtree)/include/generated/uapi \
abbf1590
DH
385 -include $(srctree)/include/linux/kconfig.h
386
1da177e4
LT
387# Use LINUXINCLUDE when you must reference the include/ directory.
388# Needed to be compatible with the O= option
abbf1590
DH
389LINUXINCLUDE := \
390 -I$(srctree)/arch/$(hdr-arch)/include \
3308b285
AB
391 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
392 -I$(objtree)/arch/$(hdr-arch)/include/generated \
abbf1590 393 $(if $(KBUILD_SRC), -I$(srctree)/include) \
3308b285 394 -I$(objtree)/include
dc33db7c
AB
395
396LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
1da177e4 397
d8672b40 398KBUILD_CPPFLAGS := -D__KERNEL__
1da177e4 399
a0f97e06 400KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
94bed2a9 401 -fno-strict-aliasing -fno-common \
a8735821 402 -Werror-implicit-function-declaration \
51b97e35 403 -Wno-format-security \
c6a38553
BP
404 -std=gnu89 $(call cc-option,-fno-PIE)
405
a1c48bb1 406
80c00ba9
SR
407KBUILD_AFLAGS_KERNEL :=
408KBUILD_CFLAGS_KERNEL :=
c6a38553 409KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
6588169d
SR
410KBUILD_AFLAGS_MODULE := -DMODULE
411KBUILD_CFLAGS_MODULE := -DMODULE
412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
1da177e4 413
f1d28fb0
RZ
414# Read KERNELRELEASE from include/config/kernel.release (if it exists)
415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
cacd54ef 416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
cb58455c 417
070b98bf 418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
80ef88d6 419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
caa27b66 420export CPP AR NM STRIP OBJCOPY OBJDUMP
011bf125 421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
070b98bf 422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
1da177e4 423
06c5040c 424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
5c9a8750 425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
222d394d 426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
6588169d 427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
80c00ba9 428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
40df759e 429export KBUILD_ARFLAGS
1da177e4
LT
430
431# When compiling out-of-tree modules, put MODVERDIR in the module
432# tree rather than in the kernel tree. The kernel tree might
433# even be read-only.
434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435
1da177e4
LT
436# Files to ignore in find ... statements
437
ae63b2d7
PB
438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
439 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440 -prune -o
450c6076
JJ
441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442 --exclude CVS --exclude .pc --exclude .hg --exclude .git
1da177e4
LT
443
444# ===========================================================================
445# Rules shared between *config targets and build targets
446
447# Basic helpers built in scripts/
4f193362 448PHONY += scripts_basic
1da177e4
LT
449scripts_basic:
450 $(Q)$(MAKE) $(build)=scripts/basic
638adb05 451 $(Q)rm -f .tmp_quiet_recordmcount
1da177e4 452
cd05e6bd
JB
453# To avoid any implicit rule to kick in, define an empty command.
454scripts/basic/%: scripts_basic ;
455
4f193362 456PHONY += outputmakefile
fd5f0cd6
JB
457# outputmakefile generates a Makefile in the output directory, if using a
458# separate output directory. This allows convenient use of make in the
459# output directory.
1da177e4 460outputmakefile:
fd5f0cd6 461ifneq ($(KBUILD_SRC),)
92979997 462 $(Q)ln -fsn $(srctree) source
fd5f0cd6
JB
463 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465endif
1da177e4 466
d8ecc5cd
SR
467# Support for using generic headers in asm-generic
468PHONY += asm-generic
469asm-generic:
470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
3c5994c8
CM
471 src=asm obj=arch/$(SRCARCH)/include/generated/asm
472 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
d8ecc5cd 474
1da177e4
LT
475# To make sure we do not include .config for any of the *config targets
476# catch them early, and hand them over to scripts/kconfig/Makefile
477# It is allowed to specify more targets when calling make, including
478# mixing *config targets and build targets.
070b98bf 479# For example 'make oldconfig all'.
1da177e4
LT
480# Detect when mixed targets is specified, and make a second invocation
481# of make so .config is not included in this case either (for *config).
482
10b63956 483version_h := include/generated/uapi/linux/version.h
223c24a7 484old_version_h := include/linux/version.h
d183e6f5 485
3eb3c740 486no-dot-config-targets := clean mrproper distclean \
fbae4d58 487 cscope gtags TAGS tags help% %docs check% coccicheck \
d183e6f5 488 $(version_h) headers_% archheaders archscripts \
4aed2fd8 489 kernelversion %src-pkg
1da177e4
LT
490
491config-targets := 0
492mixed-targets := 0
493dot-config := 1
494
495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 dot-config := 0
498 endif
499endif
500
501ifeq ($(KBUILD_EXTMOD),)
502 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503 config-targets := 1
d0d38cd9 504 ifneq ($(words $(MAKECMDGOALS)),1)
1da177e4
LT
505 mixed-targets := 1
506 endif
507 endif
508endif
a85a41ed
MM
509# install and module_install need also be processed one by one
510ifneq ($(filter install,$(MAKECMDGOALS)),)
511 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
512 mixed-targets := 1
513 endif
514endif
1da177e4
LT
515
516ifeq ($(mixed-targets),1)
517# ===========================================================================
518# We're called with mixed targets (*config and build targets).
519# Handle them one by one.
520
9319f453
MY
521PHONY += $(MAKECMDGOALS) __build_one_by_one
522
523$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
524 @:
525
526__build_one_by_one:
527 $(Q)set -e; \
528 for i in $(MAKECMDGOALS); do \
529 $(MAKE) -f $(srctree)/Makefile $$i; \
530 done
1da177e4
LT
531
532else
533ifeq ($(config-targets),1)
534# ===========================================================================
535# *config targets only - make sure prerequisites are updated, and descend
536# in scripts/kconfig to make the *config target
537
538# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
539# KBUILD_DEFCONFIG may point out an alternative default configuration
540# used for 'make defconfig'
a436bb7b 541include arch/$(SRCARCH)/Makefile
61bee204 542export KBUILD_DEFCONFIG KBUILD_KCONFIG
1da177e4 543
31110ebb 544config: scripts_basic outputmakefile FORCE
31110ebb
SR
545 $(Q)$(MAKE) $(build)=scripts/kconfig $@
546
547%config: scripts_basic outputmakefile FORCE
1da177e4
LT
548 $(Q)$(MAKE) $(build)=scripts/kconfig $@
549
550else
551# ===========================================================================
552# Build targets only - this includes vmlinux, arch specific targets, clean
553# targets and others. In general all targets except *config targets.
554
555ifeq ($(KBUILD_EXTMOD),)
556# Additional helpers built in scripts/
557# Carefully list dependencies so we do not try to build scripts twice
070b98bf 558# in parallel
4f193362 559PHONY += scripts
a54292f5 560scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
6b90bd4b 561 asm-generic gcc-plugins
1da177e4
LT
562 $(Q)$(MAKE) $(build)=$(@)
563
1da177e4
LT
564# Objects we will link into vmlinux / subdirs we need to visit
565init-y := init/
4d2acfbf 566drivers-y := drivers/ sound/ firmware/
1da177e4
LT
567net-y := net/
568libs-y := lib/
569core-y := usr/
37d9fe47 570virt-y := virt/
1da177e4
LT
571endif # KBUILD_EXTMOD
572
573ifeq ($(dot-config),1)
9ee4e336
SR
574# Read in config
575-include include/config/auto.conf
1da177e4 576
9ee4e336 577ifeq ($(KBUILD_EXTMOD),)
1da177e4
LT
578# Read in dependencies to all Kconfig* files, make sure to run
579# oldconfig if changes are detected.
c955ccaf 580-include include/config/auto.conf.cmd
1da177e4 581
1da177e4 582# To avoid any implicit rule to kick in, define an empty command
14cdd3c4 583$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
1da177e4 584
c955ccaf 585# If .config is newer than include/config/auto.conf, someone tinkered
752625cf 586# with it and forgot to run make oldconfig.
070b98bf 587# if auto.conf.cmd is missing then we are probably in a cleaned tree so
752625cf 588# we execute the config step to be sure to catch updated Kconfig files
bc081dd6 589include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
1da177e4 590 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
3041e47e 591else
264a2683 592# external modules needs include/generated/autoconf.h and include/config/auto.conf
9ee4e336
SR
593# but do not care if they are up-to-date. Use auto.conf to trigger the test
594PHONY += include/config/auto.conf
595
596include/config/auto.conf:
264a2683 597 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
5369f550
MM
598 echo >&2; \
599 echo >&2 " ERROR: Kernel configuration is invalid."; \
600 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
601 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
602 echo >&2 ; \
9ee4e336
SR
603 /bin/false)
604
605endif # KBUILD_EXTMOD
c955ccaf 606
1da177e4
LT
607else
608# Dummy target needed, because used as prerequisite
c955ccaf 609include/config/auto.conf: ;
9ee4e336 610endif # $(dot-config)
1da177e4 611
86556392
NP
612# For the kernel to actually contain only the needed exported symbols,
613# we have to build modules as well to determine what those symbols are.
614# (this can be evaluated only once include/config/auto.conf has been included)
615ifdef CONFIG_TRIM_UNUSED_KSYMS
616 KBUILD_MODULES := 1
617endif
618
1da177e4
LT
619# The all: target is the default when no target is given on the
620# command line.
621# This allow a user to issue only 'make' to build a kernel including modules
c8447161 622# Defaults to vmlinux, but the arch makefile usually adds further targets
1da177e4
LT
623all: vmlinux
624
6dd3f13e
MM
625# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
626# values of the respective KBUILD_* variables
627ARCH_CPPFLAGS :=
628ARCH_AFLAGS :=
629ARCH_CFLAGS :=
a436bb7b 630include arch/$(SRCARCH)/Makefile
a1c48bb1
GU
631
632KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
ef6000b4 633KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
a1c48bb1 634
b67067f1
NP
635ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
636KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
637KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
638endif
639
1da177e4 640ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
a76bcf55 641KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
1da177e4 642else
815eb71e 643ifdef CONFIG_PROFILE_ALL_BRANCHES
a76bcf55 644KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
815eb71e
AB
645else
646KBUILD_CFLAGS += -O2
647endif
1da177e4
LT
648endif
649
a76bcf55
AB
650KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
651 $(call cc-disable-warning,maybe-uninitialized,))
652
69102311
JK
653# Tell gcc to never replace conditional load with a non-conditional one
654KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
655
6b90bd4b
ER
656include scripts/Makefile.gcc-plugins
657
1873e870
AK
658ifdef CONFIG_READABLE_ASM
659# Disable optimizations that make assembler listings hard to read.
660# reorder blocks reorders the control in the function
661# ipa clone creates specialized cloned functions
662# partial inlining inlines only parts of functions
663KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
664 $(call cc-option,-fno-ipa-cp-clone,) \
665 $(call cc-option,-fno-partial-inlining)
666endif
667
08f67461 668ifneq ($(CONFIG_FRAME_WARN),0)
35bb5b1e
AK
669KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
670endif
671
c965b105
KC
672# This selects the stack protector compiler flag. Testing it is delayed
673# until after .config has been reprocessed, in the prepare-compiler-check
674# target.
8779657d 675ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
19952a92 676 stackp-flag := -fstack-protector
c965b105 677 stackp-name := REGULAR
6c15b327
JB
678else
679ifdef CONFIG_CC_STACKPROTECTOR_STRONG
8779657d 680 stackp-flag := -fstack-protector-strong
c965b105 681 stackp-name := STRONG
19952a92
KC
682else
683 # Force off for distro compilers that enable stack protector by default.
684 stackp-flag := $(call cc-option, -fno-stack-protector)
5d707e9c 685endif
6c15b327 686endif
c965b105
KC
687# Find arch-specific stack protector compiler sanity-checking script.
688ifdef CONFIG_CC_STACKPROTECTOR
228d96c6
KC
689 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
690 stackp-check := $(wildcard $(stackp-path))
c965b105 691endif
19952a92 692KBUILD_CFLAGS += $(stackp-flag)
e06b8b98 693
5631d9c4 694ifeq ($(cc-name),clang)
61163efa
BW
695KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
696KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
697KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
698KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
699KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
700# Quiet clang warning: comparison of unsigned expression < 0 is always false
701KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
702# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
703# source of a reference will be _MergedGlobals and not on of the whitelisted names.
704# See modpost pattern 2
705KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
26ea6bb1 706KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
61163efa
BW
707else
708
c9c6837d
AB
709# These warnings generated too much noise in a regular build.
710# Use make W=1 to enable them (see scripts/Makefile.build)
8417da6f 711KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
c9c6837d 712KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
61163efa 713endif
af0e5d56 714
1da177e4 715ifdef CONFIG_FRAME_POINTER
a0f97e06 716KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
1da177e4 717else
7e9501fd
RV
718# Some targets (ARM with Thumb2, for example), can't be built with frame
719# pointers. For those, we don't have FUNCTION_TRACER automatically
720# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
721# incompatible with -fomit-frame-pointer with current GCC, so we don't use
722# -fomit-frame-pointer with FUNCTION_TRACER.
723ifndef CONFIG_FUNCTION_TRACER
a0f97e06 724KBUILD_CFLAGS += -fomit-frame-pointer
1da177e4 725endif
7e9501fd 726endif
1da177e4 727
2062afb4
LT
728KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
729
1da177e4 730ifdef CONFIG_DEBUG_INFO
866ced95
AK
731ifdef CONFIG_DEBUG_INFO_SPLIT
732KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
733else
a0f97e06 734KBUILD_CFLAGS += -g
866ced95 735endif
2288328c 736KBUILD_AFLAGS += -Wa,-gdwarf-2
1da177e4 737endif
bfaf2dd3
AK
738ifdef CONFIG_DEBUG_INFO_DWARF4
739KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
740endif
1da177e4 741
d6f4ceb7 742ifdef CONFIG_DEBUG_INFO_REDUCED
e82c4bb8
AK
743KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
744 $(call cc-option,-fno-var-tracking)
d6f4ceb7
AK
745endif
746
606576ce 747ifdef CONFIG_FUNCTION_TRACER
c0a80c0c
HC
748ifndef CC_FLAGS_FTRACE
749CC_FLAGS_FTRACE := -pg
750endif
751export CC_FLAGS_FTRACE
a2546fae
SR
752ifdef CONFIG_HAVE_FENTRY
753CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
754endif
c0a80c0c 755KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
a2546fae 756KBUILD_AFLAGS += $(CC_USING_FENTRY)
72441cb1 757ifdef CONFIG_DYNAMIC_FTRACE
cf4db259 758 ifdef CONFIG_HAVE_C_RECORDMCOUNT
72441cb1
SR
759 BUILD_C_RECORDMCOUNT := y
760 export BUILD_C_RECORDMCOUNT
761 endif
762endif
16444a8a
ACM
763endif
764
91341d4b
SR
765# We trigger additional mismatches with less inlining
766ifdef CONFIG_DEBUG_SECTION_MISMATCH
767KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
768endif
769
e8e69931 770# arch Makefile may override CC so keep this after arch Makefile is included
e8f5bdb0 771NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
e8e69931
SR
772CHECKFLAGS += $(NOSTDINC_FLAGS)
773
1da177e4 774# warn about C99 declaration after statement
a0f97e06 775KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
1da177e4 776
070b98bf 777# disable pointer signed / unsigned warnings in gcc 4.0
8417da6f 778KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
1da177e4 779
fe8d0a41 780# disable invalid "can't wrap" optimizations for signed / pointers
a137802e 781KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
d0115552 782
8f7f5c9f
AK
783# conserve stack if available
784KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
785
80970472
ST
786# disallow errors like 'EXPORT_GPL(foo);' with missing header
787KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
788
789# require functions to have arguments in prototypes, not empty 'int foo()'
790KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
791
fe7c36c7
JT
792# Prohibit date/time macros, which would make the build non-deterministic
793KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
794
ea8daa7b
DW
795# enforce correct pointer usage
796KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
797
40df759e
MM
798# use the deterministic mode of AR if available
799KBUILD_ARFLAGS := $(call ar-option,D)
800
bf5438fc 801# check for 'asm goto'
35f860f9 802ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
bf5438fc 803 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
c0ccf6f9 804 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
bf5438fc
JB
805endif
806
a436bb7b
MY
807include scripts/Makefile.kasan
808include scripts/Makefile.extrawarn
c6d30853 809include scripts/Makefile.ubsan
a86fe353 810
61754c18
MM
811# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
812# last assignments
813KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
814KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
815KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
52bcc330 816
18991197
RM
817# Use --build-id when available.
818LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
f86fd306 819 $(call cc-ldoption, -Wl$(comma)--build-id,))
6588169d 820KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
18991197
RM
821LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
822
b67067f1
NP
823ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
824LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
825endif
826
5d7d18f5 827ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
d79a2719 828LDFLAGS_vmlinux += $(call ld-option, -X,)
5d7d18f5
DH
829endif
830
1da177e4 831# Default kernel image to build when no specific target is given.
070b98bf 832# KBUILD_IMAGE may be overruled on the command line or
1da177e4
LT
833# set in the environment
834# Also any assignments in arch/$(ARCH)/Makefile take precedence over
835# this default value
836export KBUILD_IMAGE ?= vmlinux
837
838#
839# INSTALL_PATH specifies where to place the updated kernel and system map
840# images. Default is /boot, but you can set it to other values
841export INSTALL_PATH ?= /boot
842
f4d4ffc0
JC
843#
844# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
845# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
846# an argument if needed. Otherwise it defaults to the kernel install path
847#
848export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
849
1da177e4
LT
850#
851# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
852# relocations required by build roots. This is not defined in the
070b98bf 853# makefile but the argument can be passed to make if needed.
1da177e4
LT
854#
855
df9df036 856MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1da177e4
LT
857export MODLIB
858
ac031f26 859#
3fbb43df
MY
860# INSTALL_MOD_STRIP, if defined, will cause modules to be
861# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
862# the default option --strip-debug will be used. Otherwise,
863# INSTALL_MOD_STRIP value will be used as the options to the strip command.
2ea03891 864
ac031f26
TT
865ifdef INSTALL_MOD_STRIP
866ifeq ($(INSTALL_MOD_STRIP),1)
2ea03891 867mod_strip_cmd = $(STRIP) --strip-debug
ac031f26 868else
2ea03891 869mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
ac031f26
TT
870endif # INSTALL_MOD_STRIP=1
871else
2ea03891 872mod_strip_cmd = true
ac031f26
TT
873endif # INSTALL_MOD_STRIP
874export mod_strip_cmd
875
beb50df3
BJ
876# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
877# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
878# or CONFIG_MODULE_COMPRESS_XZ.
879
880mod_compress_cmd = true
881ifdef CONFIG_MODULE_COMPRESS
882 ifdef CONFIG_MODULE_COMPRESS_GZIP
3d1450d5 883 mod_compress_cmd = gzip -n -f
beb50df3
BJ
884 endif # CONFIG_MODULE_COMPRESS_GZIP
885 ifdef CONFIG_MODULE_COMPRESS_XZ
3d1450d5 886 mod_compress_cmd = xz -f
beb50df3
BJ
887 endif # CONFIG_MODULE_COMPRESS_XZ
888endif # CONFIG_MODULE_COMPRESS
889export mod_compress_cmd
890
1bf49dd4 891# Select initial ramdisk compression format, default is gzip(1).
892# This shall be used by the dracut(8) tool while creating an initramfs image.
893#
7ac18156
JB
894INITRD_COMPRESS-y := gzip
895INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
896INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
897INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
898INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
899INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
b7000ade
LT
900# do not export INITRD_COMPRESS, since we didn't actually
901# choose a sane default compression above.
902# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1da177e4 903
d9d8d7ed 904ifdef CONFIG_MODULE_SIG_ALL
3ee550f1
DW
905$(eval $(call config_filename,MODULE_SIG_KEY))
906
907mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
e2a666d5
RR
908else
909mod_sign_cmd = true
910endif
911export mod_sign_cmd
912
913
1da177e4 914ifeq ($(KBUILD_EXTMOD),)
cfc411e7 915core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1da177e4
LT
916
917vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
918 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
37d9fe47 919 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1da177e4
LT
920
921vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
37d9fe47 922 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
1da177e4
LT
923
924init-y := $(patsubst %/, %/built-in.o, $(init-y))
925core-y := $(patsubst %/, %/built-in.o, $(core-y))
926drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
927net-y := $(patsubst %/, %/built-in.o, $(net-y))
928libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
929libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
930libs-y := $(libs-y1) $(libs-y2)
37d9fe47 931virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
1da177e4 932
1f2bfbd0 933# Externally visible symbols (used by link-vmlinux.sh)
95698570 934export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
37d9fe47 935export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
95698570 936export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1f2bfbd0 937export LDFLAGS_vmlinux
6615d6c3 938# used by scripts/pacmage/Makefile
37d9fe47 939export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
9bb48247 940
1f2bfbd0 941vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
1da177e4 942
2441e78b
NP
943# Include targets which we want to execute sequentially if the rest of the
944# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
945# evaluated more than once.
946PHONY += vmlinux_prereq
947vmlinux_prereq: $(vmlinux-deps) FORCE
0f836e5f 948ifdef CONFIG_HEADERS_CHECK
0e7af8d0 949 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
267c4025 950endif
3ee7b3fa
JK
951ifdef CONFIG_GDB_SCRIPTS
952 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
0f836e5f 953endif
2441e78b 954ifdef CONFIG_TRIM_UNUSED_KSYMS
ba79d401 955 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
86556392 956 "$(MAKE) -f $(srctree)/Makefile vmlinux"
2441e78b 957endif
23121ca2
NP
958
959# standalone target for easier testing
960include/generated/autoksyms.h: FORCE
ba79d401 961 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
23121ca2 962
fbe6e37d
NP
963ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
964
965# Final link of vmlinux with optional arch pass after final link
966 cmd_link-vmlinux = \
967 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
968 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
2441e78b 969
edf69470 970vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1f2bfbd0 971 +$(call if_changed,link-vmlinux)
741f98fe 972
dd92478a
NP
973# Build samples along the rest of the kernel
974ifdef CONFIG_SAMPLES
975vmlinux-dirs += samples
976endif
977
38385f8f 978# The actual objects are generated when descending,
1da177e4 979# make sure no implicit rule kicks in
1f2bfbd0 980$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1da177e4
LT
981
982# Handle descending into subdirectories listed in $(vmlinux-dirs)
983# Preset locale variables to speed up the build process. Limit locale
984# tweaks to this spot to avoid wrong language settings when running
985# make menuconfig etc.
986# Error messages still appears in the original language
987
4f193362 988PHONY += $(vmlinux-dirs)
5bb78269 989$(vmlinux-dirs): prepare scripts
1da177e4
LT
990 $(Q)$(MAKE) $(build)=$@
991
0d0e7718
MM
992define filechk_kernel.release
993 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
994endef
995
83a35e36 996# Store (new) KERNELRELEASE string in include/config/kernel.release
f1d28fb0 997include/config/kernel.release: include/config/auto.conf FORCE
0d0e7718 998 $(call filechk,kernel.release)
cb58455c
SR
999
1000
1da177e4 1001# Things we need to do before we recursively start building the kernel
5bb78269
SR
1002# or the modules are listed in "prepare".
1003# A multi level approach is used. prepareN is processed before prepareN-1.
1004# archprepare is used in arch Makefiles and when processed asm symlink,
1005# version.h and scripts_basic is processed / created.
1da177e4 1006
5bb78269 1007# Listed in dependency order
4f193362 1008PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
5bb78269 1009
86feeaa8 1010# prepare3 is used to check if we are building in a separate output directory,
1da177e4
LT
1011# and if so do:
1012# 1) Check that make has not been executed in the kernel src $(srctree)
f1d28fb0 1013prepare3: include/config/kernel.release
1da177e4 1014ifneq ($(KBUILD_SRC),)
fd54f502 1015 @$(kecho) ' Using $(srctree) as source for kernel'
c955ccaf 1016 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
5369f550
MM
1017 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1018 echo >&2 " in the '$(srctree)' directory.";\
1da177e4
LT
1019 /bin/false; \
1020 fi;
1da177e4
LT
1021endif
1022
c965b105
KC
1023# prepare2 creates a makefile if using a separate output directory.
1024# From this point forward, .config has been reprocessed, so any rules
1025# that need to depend on updated CONFIG_* values can be checked here.
1026prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1da177e4 1027
d183e6f5 1028prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
f7f16b77 1029 include/config/auto.conf
7bb9d092 1030 $(cmd_crmodverdir)
1da177e4 1031
6520fe55 1032archprepare: archheaders archscripts prepare1 scripts_basic
5bb78269 1033
6b90bd4b 1034prepare0: archprepare gcc-plugins
8d36a623 1035 $(Q)$(MAKE) $(build)=.
86feeaa8 1036
1da177e4 1037# All the preparing..
b9ab5ebb
JP
1038prepare: prepare0 prepare-objtool
1039
3b27a0c8 1040ifdef CONFIG_STACK_VALIDATION
c2bb9e32
SR
1041 has_libelf := $(call try-run,\
1042 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
3b27a0c8
JP
1043 ifeq ($(has_libelf),1)
1044 objtool_target := tools/objtool FORCE
1045 else
b573d802 1046 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
3b27a0c8
JP
1047 SKIP_STACK_VALIDATION := 1
1048 export SKIP_STACK_VALIDATION
1049 endif
1050endif
1051
b9ab5ebb 1052PHONY += prepare-objtool
3b27a0c8 1053prepare-objtool: $(objtool_target)
1da177e4 1054
c965b105
KC
1055# Check for CONFIG flags that require compiler support. Abort the build
1056# after .config has been processed, but before the kernel build starts.
1057#
1058# For security-sensitive CONFIG options, we don't want to fallback and/or
1059# silently change which compiler flags will be used, since that leads to
1060# producing kernels with different security feature characteristics
1061# depending on the compiler used. (For example, "But I selected
1062# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1063PHONY += prepare-compiler-check
1064prepare-compiler-check: FORCE
1065# Make sure compiler supports requested stack protector flag.
1066ifdef stackp-name
1067 ifeq ($(call cc-option, $(stackp-flag)),)
1068 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1069 $(stackp-flag) not supported by compiler >&2 && exit 1
1070 endif
1071endif
1072# Make sure compiler does not have buggy stack-protector support.
1073ifdef stackp-check
1074 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1075 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1076 $(stackp-flag) available but compiler is broken >&2 && exit 1
1077 endif
1078endif
1079 @:
1080
1da177e4
LT
1081# Generate some files
1082# ---------------------------------------------------------------------------
1083
1084# KERNELRELEASE can change from a few different places, meaning version.h
1085# needs to be updated, so this check is forced on all builds
1086
1087uts_len := 64
63104eec
SR
1088define filechk_utsrelease.h
1089 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1090 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1091 exit 1; \
1092 fi; \
1093 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1094endef
1da177e4
LT
1095
1096define filechk_version.h
450c6076
JJ
1097 (echo \#define LINUX_VERSION_CODE $(shell \
1098 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
63104eec 1099 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1da177e4
LT
1100endef
1101
d183e6f5 1102$(version_h): $(srctree)/Makefile FORCE
1da177e4 1103 $(call filechk,version.h)
223c24a7 1104 $(Q)rm -f $(old_version_h)
1da177e4 1105
273b281f 1106include/generated/utsrelease.h: include/config/kernel.release FORCE
63104eec
SR
1107 $(call filechk,utsrelease.h)
1108
179efcb4
VN
1109PHONY += headerdep
1110headerdep:
9663d989
PF
1111 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1112 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
179efcb4 1113
88ecf814
DW
1114# ---------------------------------------------------------------------------
1115# Firmware install
1116INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1117export INSTALL_FW_PATH
1118
1119PHONY += firmware_install
2e8d696b 1120firmware_install:
88ecf814
DW
1121 @mkdir -p $(objtree)/firmware
1122 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1123
8d730cfb
DW
1124# ---------------------------------------------------------------------------
1125# Kernel headers
8d730cfb 1126
e6883b18
SR
1127#Default location for installed headers
1128export INSTALL_HDR_PATH = $(objtree)/usr
6d716275 1129
2fb9b1bd
SR
1130# If we do an all arch process set dst to asm-$(hdr-arch)
1131hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
e6883b18 1132
052ad274
PA
1133PHONY += archheaders
1134archheaders:
1135
6520fe55
PA
1136PHONY += archscripts
1137archscripts:
1138
e6883b18 1139PHONY += __headers
2e8d696b 1140__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
e1b702cf 1141 $(Q)$(MAKE) $(build)=scripts build_unifdef
e6883b18
SR
1142
1143PHONY += headers_install_all
2fb9b1bd
SR
1144headers_install_all:
1145 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
6d716275 1146
8d730cfb 1147PHONY += headers_install
e6883b18 1148headers_install: __headers
10b63956
DH
1149 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1150 $(error Headers not exportable for the $(SRCARCH) architecture))
1151 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1152 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
8d730cfb 1153
1f85712e
MF
1154PHONY += headers_check_all
1155headers_check_all: headers_install_all
2fb9b1bd 1156 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1f85712e 1157
68475359
DW
1158PHONY += headers_check
1159headers_check: headers_install
10b63956
DH
1160 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1161 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
68475359 1162
5a5da78b
SK
1163# ---------------------------------------------------------------------------
1164# Kernel selftest
1165
1166PHONY += kselftest
1167kselftest:
1168 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1169
dcb825a9
WL
1170kselftest-clean:
1171 $(Q)$(MAKE) -C tools/testing/selftests clean
1172
3d6dee7a
BJZ
1173PHONY += kselftest-merge
1174kselftest-merge:
1175 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1176 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1177 -m $(objtree)/.config \
1178 $(srctree)/tools/testing/selftests/*/config
1179 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1180
1da177e4
LT
1181# ---------------------------------------------------------------------------
1182# Modules
1183
1184ifdef CONFIG_MODULES
1185
070b98bf 1186# By default, build modules as well
1da177e4 1187
73d1393e 1188all: modules
1da177e4 1189
3fbb43df 1190# Build modules
551559e1 1191#
3fbb43df
MY
1192# A module can be listed more than once in obj-m resulting in
1193# duplicate lines in modules.order files. Those are removed
1194# using awk while concatenating to the final file.
1da177e4 1195
4f193362 1196PHONY += modules
2da30e70 1197modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
551559e1 1198 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
fd54f502 1199 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1200 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
44463f7d 1201 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1da177e4 1202
a6c36632
MM
1203modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1204 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1205
73d1393e 1206%/modules.builtin: include/config/auto.conf
a6c36632
MM
1207 $(Q)$(MAKE) $(modbuiltin)=$*
1208
1da177e4
LT
1209
1210# Target to prepare building external modules
4f193362 1211PHONY += modules_prepare
5bb78269 1212modules_prepare: prepare scripts
1da177e4
LT
1213
1214# Target to install modules
4f193362 1215PHONY += modules_install
1da177e4
LT
1216modules_install: _modinst_ _modinst_post
1217
4f193362 1218PHONY += _modinst_
2da30e70 1219_modinst_:
1da177e4
LT
1220 @rm -rf $(MODLIB)/kernel
1221 @rm -f $(MODLIB)/source
1222 @mkdir -p $(MODLIB)/kernel
890676c6 1223 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1da177e4
LT
1224 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1225 rm -f $(MODLIB)/build ; \
7e1c0477 1226 ln -s $(CURDIR) $(MODLIB)/build ; \
1da177e4 1227 fi
551559e1 1228 @cp -f $(objtree)/modules.order $(MODLIB)/
bc081dd6 1229 @cp -f $(objtree)/modules.builtin $(MODLIB)/
b805aa0e 1230 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1231
50a8ec31 1232# This depmod is only for convenience to give the initial
1da177e4
LT
1233# boot a modules.dep even before / is mounted read-write. However the
1234# boot script depmod is the master version.
4f193362 1235PHONY += _modinst_post
6d128e1e 1236_modinst_post: _modinst_
88ecf814 1237 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
50a8ec31 1238 $(call cmd,depmod)
1da177e4 1239
d890f510
JB
1240ifeq ($(CONFIG_MODULE_SIG), y)
1241PHONY += modules_sign
1242modules_sign:
1243 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1244endif
1245
1da177e4
LT
1246else # CONFIG_MODULES
1247
1248# Modules not configured
1249# ---------------------------------------------------------------------------
1250
612e47ce
MY
1251PHONY += modules modules_install
1252modules modules_install:
5369f550
MM
1253 @echo >&2
1254 @echo >&2 "The present kernel configuration has modules disabled."
1255 @echo >&2 "Type 'make config' and enable loadable module support."
1256 @echo >&2 "Then build a kernel with module support enabled."
1257 @echo >&2
1da177e4
LT
1258 @exit 1
1259
1260endif # CONFIG_MODULES
1261
1da177e4
LT
1262###
1263# Cleaning is done on three levels.
1264# make clean Delete most generated files
1265# Leave enough to build external modules
1266# make mrproper Delete the current configuration, and all generated files
1267# make distclean Remove editor backup files, patch leftover files and the like
1268
1269# Directories & files removed with 'make clean'
1270CLEAN_DIRS += $(MODVERDIR)
1da177e4
LT
1271
1272# Directories & files removed with 'make mrproper'
d8ecc5cd 1273MRPROPER_DIRS += include/config usr/include include/generated \
3fbb43df 1274 arch/*/include/generated .tmp_objdiff
c22bd32c 1275MRPROPER_FILES += .config .config.old .version .old_version \
d5b71936 1276 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
fb117949
DW
1277 signing_key.pem signing_key.priv signing_key.x509 \
1278 x509.genkey extra_certificates signing_key.x509.keyid \
3ee7b3fa 1279 signing_key.x509.signer vmlinux-gdb.py
1da177e4
LT
1280
1281# clean - Delete most, but leave enough to build external modules
1282#
1283clean: rm-dirs := $(CLEAN_DIRS)
1284clean: rm-files := $(CLEAN_FILES)
fb68d4be 1285clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1da177e4 1286
bd1ee804 1287PHONY += $(clean-dirs) clean archclean vmlinuxclean
1da177e4
LT
1288$(clean-dirs):
1289 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1290
bd1ee804
PM
1291vmlinuxclean:
1292 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
fbe6e37d 1293 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
bd1ee804
PM
1294
1295clean: archclean vmlinuxclean
1da177e4
LT
1296
1297# mrproper - Delete all generated files, including .config
1298#
1299mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1300mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1301mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1302
4f193362 1303PHONY += $(mrproper-dirs) mrproper archmrproper
1da177e4
LT
1304$(mrproper-dirs):
1305 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1306
1307mrproper: clean archmrproper $(mrproper-dirs)
1308 $(call cmd,rmdirs)
1309 $(call cmd,rmfiles)
1310
1311# distclean
1312#
4f193362 1313PHONY += distclean
1da177e4
LT
1314
1315distclean: mrproper
1316 @find $(srctree) $(RCS_FIND_IGNORE) \
070b98bf 1317 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1da177e4 1318 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
a03fcb50 1319 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1da177e4
LT
1320 -type f -print | xargs rm -f
1321
1322
1323# Packaging of the kernel to various formats
1324# ---------------------------------------------------------------------------
1325# rpm target kept for backward compatibility
c79624c1 1326package-dir := scripts/package
1da177e4 1327
bafb6747
ACM
1328%src-pkg: FORCE
1329 $(Q)$(MAKE) $(build)=$(package-dir) $@
031ecc6d 1330%pkg: include/config/kernel.release FORCE
6c2133e1 1331 $(Q)$(MAKE) $(build)=$(package-dir) $@
031ecc6d 1332rpm: include/config/kernel.release FORCE
6c2133e1 1333 $(Q)$(MAKE) $(build)=$(package-dir) $@
1da177e4
LT
1334
1335
1336# Brief documentation of the typical targets used
1337# ---------------------------------------------------------------------------
1338
5dffbe81 1339boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
a1e7b7bb 1340boards := $(sort $(notdir $(boards)))
5dffbe81
SB
1341board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1342board-dirs := $(sort $(notdir $(board-dirs:/=)))
1da177e4 1343
fe69b420 1344PHONY += help
1da177e4
LT
1345help:
1346 @echo 'Cleaning targets:'
5ea084ef 1347 @echo ' clean - Remove most generated files but keep the config and'
5cc8d246 1348 @echo ' enough build support to build external modules'
5ea084ef 1349 @echo ' mrproper - Remove all generated files + config + various backup files'
5cc8d246 1350 @echo ' distclean - mrproper + remove editor backup and patch files'
1da177e4
LT
1351 @echo ''
1352 @echo 'Configuration targets:'
1353 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1354 @echo ''
1355 @echo 'Other generic targets:'
1356 @echo ' all - Build all targets marked with [*]'
1357 @echo '* vmlinux - Build the bare kernel'
1358 @echo '* modules - Build all modules'
9cc5d74c 1359 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
88ecf814
DW
1360 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1361 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1da177e4 1362 @echo ' dir/ - Build all files in dir and below'
40ab87a4 1363 @echo ' dir/file.[ois] - Build specified target only'
62718979
JP
1364 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1365 @echo ' (requires a recent binutils and recent build (System.map))'
155ad605 1366 @echo ' dir/file.ko - Build module including final link'
c4d5ee67 1367 @echo ' modules_prepare - Set up for building external modules'
1da177e4
LT
1368 @echo ' tags/TAGS - Generate tags file for editors'
1369 @echo ' cscope - Generate cscope index'
f4ed1009 1370 @echo ' gtags - Generate GNU GLOBAL index'
3f1d9a6c
MM
1371 @echo ' kernelrelease - Output the release version string (use with make -s)'
1372 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1373 @echo ' image_name - Output the image name (use with make -s)'
2fb9b1bd 1374 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
59df3230 1375 echo ' (default: $(INSTALL_HDR_PATH))'; \
2fb9b1bd 1376 echo ''
1da177e4 1377 @echo 'Static analysers'
1da177e4
LT
1378 @echo ' checkstack - Generate a list of stack hogs'
1379 @echo ' namespacecheck - Name space analysis on compiled kernel'
aa025e7d 1380 @echo ' versioncheck - Sanity check on version.h usage'
ec2d987f 1381 @echo ' includecheck - Check for duplicate included header files'
295ac051 1382 @echo ' export_report - List the usages of all exported symbols'
179efcb4 1383 @echo ' headers_check - Sanity check on exported headers'
74425eee
NP
1384 @echo ' headerdep - Detect inclusion cycles in headers'
1385 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1386 @echo ''
5a5da78b
SK
1387 @echo 'Kernel selftest'
1388 @echo ' kselftest - Build and run kernel selftest (run as root)'
1389 @echo ' Build, install, and boot kernel before'
1390 @echo ' running kselftest on it'
dcb825a9 1391 @echo ' kselftest-clean - Remove all generated kselftest files'
3d6dee7a
BJZ
1392 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1393 @echo ' .config.'
5a5da78b 1394 @echo ''
1da177e4 1395 @echo 'Kernel packaging:'
6c2133e1 1396 @$(MAKE) $(build)=$(package-dir) help
1da177e4
LT
1397 @echo ''
1398 @echo 'Documentation targets:'
ebc88ef0
JN
1399 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1400 @echo ''
1da177e4
LT
1401 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1402 @echo ''
01dee188 1403 @echo 'Architecture specific targets ($(SRCARCH)):'
1da177e4 1404 @$(if $(archhelp),$(archhelp),\
01dee188 1405 echo ' No architecture specific help defined for $(SRCARCH)')
1da177e4
LT
1406 @echo ''
1407 @$(if $(boards), \
1408 $(foreach b, $(boards), \
1409 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1410 echo '')
5dffbe81
SB
1411 @$(if $(board-dirs), \
1412 $(foreach b, $(board-dirs), \
1413 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1414 printf " %-16s - Show all of the above\\n" help-boards; \
1415 echo '')
1da177e4
LT
1416
1417 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
45d506bd 1418 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1da177e4 1419 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
701842e3
DK
1420 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1421 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
af07ce3e 1422 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
28bc20dc
SR
1423 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1424 @echo ' 1: warnings which may be relevant and do not occur too often'
1425 @echo ' 2: warnings which occur quite often but may still be relevant'
1426 @echo ' 3: more obscure warnings, can most likely be ignored'
a6de553d 1427 @echo ' Multiple levels can be combined with W=12 or W=123'
1da177e4
LT
1428 @echo ''
1429 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1430 @echo 'For further info see the ./README file'
1431
1432
5dffbe81
SB
1433help-board-dirs := $(addprefix help-,$(board-dirs))
1434
1435help-boards: $(help-board-dirs)
1436
fbae4d58 1437boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
5dffbe81
SB
1438
1439$(help-board-dirs): help-%:
1440 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1441 @$(if $(boards-per-dir), \
1442 $(foreach b, $(boards-per-dir), \
1443 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1444 echo '')
1445
1446
1da177e4
LT
1447# Documentation targets
1448# ---------------------------------------------------------------------------
d565127d 1449DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
22cba31b
JN
1450PHONY += $(DOC_TARGETS)
1451$(DOC_TARGETS): scripts_basic FORCE
b479bfd0 1452 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
22cba31b 1453 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1da177e4
LT
1454 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1455
1456else # KBUILD_EXTMOD
1457
1458###
1459# External module support.
1460# When building external modules the kernel used as basis is considered
1461# read-only, and no consistency checks are made and the make
1462# system is not used on the basis kernel. If updates are required
1463# in the basis kernel ordinary make commands (without M=...) must
1464# be used.
1465#
1466# The following are the only valid targets when building external
1467# modules.
1468# make M=dir clean Delete all automatically generated files
1469# make M=dir modules Make all modules in specified dir
1470# make M=dir Same as 'make M=dir modules'
1471# make M=dir modules_install
070b98bf 1472# Install the modules built in the module directory
1da177e4
LT
1473# Assumes install directory is already created
1474
1475# We are always building modules
1476KBUILD_MODULES := 1
4f193362 1477PHONY += crmodverdir
1da177e4 1478crmodverdir:
7bb9d092 1479 $(cmd_crmodverdir)
1da177e4 1480
4f193362 1481PHONY += $(objtree)/Module.symvers
1da177e4
LT
1482$(objtree)/Module.symvers:
1483 @test -e $(objtree)/Module.symvers || ( \
1484 echo; \
1485 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1486 echo " is missing; modules will have no dependencies and modversions."; \
1487 echo )
1488
1489module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
4f193362 1490PHONY += $(module-dirs) modules
1da177e4
LT
1491$(module-dirs): crmodverdir $(objtree)/Module.symvers
1492 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1493
1494modules: $(module-dirs)
fd54f502 1495 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1496 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1da177e4 1497
4f193362 1498PHONY += modules_install
a67dc21a 1499modules_install: _emodinst_ _emodinst_post
e6304663 1500
4f193362
PS
1501install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1502PHONY += _emodinst_
a67dc21a 1503_emodinst_:
a67dc21a 1504 $(Q)mkdir -p $(MODLIB)/$(install-dir)
b805aa0e 1505 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1506
4f193362 1507PHONY += _emodinst_post
a67dc21a
SR
1508_emodinst_post: _emodinst_
1509 $(call cmd,depmod)
1510
1da177e4
LT
1511clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1512
4f193362 1513PHONY += $(clean-dirs) clean
1da177e4
LT
1514$(clean-dirs):
1515 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1516
1517clean: rm-dirs := $(MODVERDIR)
88d7be03 1518clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1da177e4 1519
fe69b420 1520PHONY += help
1da177e4
LT
1521help:
1522 @echo ' Building external modules.'
1523 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1524 @echo ''
1525 @echo ' modules - default target, build the module(s)'
1526 @echo ' modules_install - install the module'
1527 @echo ' clean - remove generated files in module directory only'
1528 @echo ''
06300b21
SR
1529
1530# Dummies...
4f193362 1531PHONY += prepare scripts
06300b21
SR
1532prepare: ;
1533scripts: ;
1da177e4
LT
1534endif # KBUILD_EXTMOD
1535
88d7be03
MM
1536clean: $(clean-dirs)
1537 $(call cmd,rmdirs)
1538 $(call cmd,rmfiles)
43f67c98 1539 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
88d7be03 1540 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
addbcdbb 1541 -o -name '*.ko.*' \
866ced95 1542 -o -name '*.dwo' \
d523b255 1543 -o -name '*.su' \
88d7be03
MM
1544 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1545 -o -name '*.symtypes' -o -name 'modules.order' \
1546 -o -name modules.builtin -o -name '.tmp_*.o.*' \
6b90bd4b 1547 -o -name '*.c.[012]*.*' \
88d7be03
MM
1548 -o -name '*.gcno' \) -type f -print | xargs rm -f
1549
1da177e4
LT
1550# Generate tags for editors
1551# ---------------------------------------------------------------------------
a680eedc
SR
1552quiet_cmd_tags = GEN $@
1553 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1da177e4 1554
f4ed1009 1555tags TAGS cscope gtags: FORCE
1da177e4
LT
1556 $(call cmd,tags)
1557
1da177e4
LT
1558# Scripts to check various things for consistency
1559# ---------------------------------------------------------------------------
1560
279f3dd3
PF
1561PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1562
1da177e4 1563includecheck:
436f876c 1564 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1565 -name '*.[hcS]' -type f -print | sort \
80007434 1566 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1da177e4
LT
1567
1568versioncheck:
2ee2d292 1569 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1570 -name '*.[hcS]' -type f -print | sort \
80007434 1571 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1da177e4 1572
74425eee
NP
1573coccicheck:
1574 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1575
1da177e4
LT
1576namespacecheck:
1577 $(PERL) $(srctree)/scripts/namespace.pl
1578
295ac051
AB
1579export_report:
1580 $(PERL) $(srctree)/scripts/export_report.pl
1581
1da177e4
LT
1582endif #ifeq ($(config-targets),1)
1583endif #ifeq ($(mixed-targets),1)
1584
c398ff00 1585PHONY += checkstack kernelrelease kernelversion image_name
e3ccf6e3 1586
011e3a9a
JD
1587# UML needs a little special treatment here. It wants to use the host
1588# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1589# else wants $(ARCH), including people doing cross-builds, which means
1590# that $(SUBARCH) doesn't work here.
1591ifeq ($(ARCH), um)
1592CHECKSTACK_ARCH := $(SUBARCH)
1593else
1594CHECKSTACK_ARCH := $(ARCH)
1595endif
1da177e4
LT
1596checkstack:
1597 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
011e3a9a 1598 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1da177e4 1599
7b8ea53d
AW
1600kernelrelease:
1601 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
01ab1788 1602
cb58455c 1603kernelversion:
2244cbd8 1604 @echo $(KERNELVERSION)
1da177e4 1605
c398ff00
MM
1606image_name:
1607 @echo $(KBUILD_IMAGE)
1608
ea01fa9f
BP
1609# Clear a bunch of variables before executing the submake
1610tools/: FORCE
bf35182f 1611 $(Q)mkdir -p $(objtree)/tools
e572d088 1612 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
ea01fa9f
BP
1613
1614tools/%: FORCE
bf35182f 1615 $(Q)mkdir -p $(objtree)/tools
e572d088 1616 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
ea01fa9f 1617
06300b21
SR
1618# Single targets
1619# ---------------------------------------------------------------------------
bc2546a6 1620# Single targets are compatible with:
e1b8513d 1621# - build with mixed source and output
bc2546a6
SR
1622# - build with separate output dir 'make O=...'
1623# - external modules
1624#
1625# target-dir => where to store outputfile
1626# build-dir => directory in kernel source tree to use
1627
1628ifeq ($(KBUILD_EXTMOD),)
aa360879 1629 build-dir = $(patsubst %/,%,$(dir $@))
bc2546a6
SR
1630 target-dir = $(dir $@)
1631else
1632 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1633 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1634 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1635endif
1636
f6ecebd6 1637%.s: %.c prepare scripts FORCE
bc2546a6 1638 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1639%.i: %.c prepare scripts FORCE
bc2546a6 1640 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1641%.o: %.c prepare scripts FORCE
bc2546a6 1642 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1643%.lst: %.c prepare scripts FORCE
bc2546a6 1644 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1645%.s: %.S prepare scripts FORCE
bc2546a6 1646 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1647%.o: %.S prepare scripts FORCE
bc2546a6 1648 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
15fde675
AG
1649%.symtypes: %.c prepare scripts FORCE
1650 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
06300b21 1651
bc2546a6 1652# Modules
31110ebb
SR
1653/: prepare scripts FORCE
1654 $(cmd_crmodverdir)
1655 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1656 $(build)=$(build-dir)
8e2faea8 1657# Make sure the latest headers are built for Documentation
ddea05fa 1658Documentation/ samples/: headers_install
31110ebb 1659%/: prepare scripts FORCE
7bb9d092 1660 $(cmd_crmodverdir)
06300b21 1661 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6
SR
1662 $(build)=$(build-dir)
1663%.ko: prepare scripts FORCE
7bb9d092 1664 $(cmd_crmodverdir)
06300b21 1665 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6 1666 $(build)=$(build-dir) $(@:.ko=.o)
b805aa0e 1667 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
06300b21 1668
38385f8f 1669# FIXME Should go into a make.lib or something
1da177e4
LT
1670# ===========================================================================
1671
1672quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1673 cmd_rmdirs = rm -rf $(rm-dirs)
1674
1675quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1676 cmd_rmfiles = rm -f $(rm-files)
1677
bc3c26fe 1678# Run depmod only if we have System.map and depmod is executable
50a8ec31 1679quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
569658dd 1680 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
b92021b0 1681 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
50a8ec31 1682
7bb9d092 1683# Create temporary dir for module support files
ab19f879
SR
1684# clean it up only when building all modules
1685cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1686 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1da177e4 1687
1da177e4
LT
1688# read all saved command lines
1689
1690targets := $(wildcard $(sort $(targets)))
1691cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1692
1693ifneq ($(cmd_files),)
1694 $(cmd_files): ; # Do not try to update included dependency files
1695 include $(cmd_files)
1696endif
1697
1da177e4
LT
1698endif # skip-makefile
1699
4f193362 1700PHONY += FORCE
1da177e4 1701FORCE:
4f193362 1702
4f193362 1703# Declare the contents of the .PHONY variable as phony. We keep that
fe8d0a41 1704# information in a variable so we can use it in if_changed and friends.
4f193362 1705.PHONY: $(PHONY)