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c517d838
LT
1VERSION = 4
2PATCHLEVEL = 0
55922c9d 3SUBLEVEL = 0
bc465aa9 4EXTRAVERSION = -rc5
c517d838 5NAME = Hurr durr I'ma sheep
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
7ff52571
MY
13# Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15MAKEFLAGS += -rR
1da177e4 16
c051346b 17# Avoid funny character set dependencies
06b5dc64 18unexport LC_ALL
c051346b
PA
19LC_COLLATE=C
20LC_NUMERIC=C
07105202 21export LC_COLLATE LC_NUMERIC
c051346b 22
ab7474ea
BP
23# Avoid interference with shell env settings
24unexport GREP_OPTIONS
25
1da177e4
LT
26# We are using a recursive build, so we need to do a little thinking
27# to get the ordering right.
28#
29# Most importantly: sub-Makefiles should only ever modify files in
30# their own directory. If in some directory we have a dependency on
31# a file in another dir (which doesn't happen often, but it's often
32# unavoidable when linking the built-in.o targets which finally
33# turn into vmlinux), we will call a sub make in that other dir, and
34# after that we are sure that everything which is in that other dir
35# is now up to date.
36#
37# The only cases where we need to modify files which have global
38# effects are thus separated out and done before the recursive
39# descending is started. They are now explicitly listed as the
40# prepare rule.
41
066b7ed9
MM
42# Beautify output
43# ---------------------------------------------------------------------------
44#
45# Normally, we echo the whole command before executing it. By making
46# that echo $($(quiet)$(cmd)), we now have the possibility to set
47# $(quiet) to choose other forms of output instead, e.g.
48#
49# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
51#
52# If $(quiet) is empty, the whole command will be printed.
53# If it is set to "quiet_", only the short version will be printed.
54# If it is set to "silent_", nothing will be printed at all, since
55# the variable $(silent_cmd_cc_o_c) doesn't exist.
56#
57# A simple variant is to prefix commands with $(Q) - that's useful
58# for commands that shall be hidden in non-verbose mode.
59#
60# $(Q)ln $@ :<
61#
62# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64#
1da177e4
LT
65# To put more focus on warnings, be less verbose as default
66# Use 'make V=1' to see the full commands
67
b8b0618c
CR
68ifeq ("$(origin V)", "command line")
69 KBUILD_VERBOSE = $(V)
1da177e4
LT
70endif
71ifndef KBUILD_VERBOSE
72 KBUILD_VERBOSE = 0
73endif
74
066b7ed9
MM
75ifeq ($(KBUILD_VERBOSE),1)
76 quiet =
77 Q =
78else
79 quiet=quiet_
80 Q = @
81endif
82
83# If the user is running make -s (silent mode), suppress echoing of
84# commands
85
86ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88 quiet=silent_
89endif
90else # make-3.8x
91ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92 quiet=silent_
93endif
94endif
95
96export quiet Q KBUILD_VERBOSE
97
1da177e4
LT
98# kbuild supports saving output files in a separate directory.
99# To locate output files in a separate directory two syntaxes are supported.
100# In both cases the working directory must be the root of the kernel src.
101# 1) O=
102# Use "make O=dir/to/store/output/files/"
070b98bf 103#
1da177e4
LT
104# 2) Set KBUILD_OUTPUT
105# Set the environment variable KBUILD_OUTPUT to point to the directory
106# where the output files shall be placed.
107# export KBUILD_OUTPUT=dir/to/store/output/files/
108# make
109#
110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111# variable.
112
1da177e4
LT
113# KBUILD_SRC is set on invocation of make in OBJ directory
114# KBUILD_SRC is not intended to be used by the regular user (for now)
115ifeq ($(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 := $(O)
1da177e4
LT
121endif
122
123# That's our default target when none is given on the command line
4f193362 124PHONY := _all
1da177e4
LT
125_all:
126
1cacc9ab
SR
127# Cancel implicit rules on top Makefile
128$(CURDIR)/Makefile Makefile: ;
129
1da177e4
LT
130ifneq ($(KBUILD_OUTPUT),)
131# Invoke a second make in the output directory, passing relevant variables
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
1c9e70a5
MY
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135 && /bin/pwd)
1da177e4 136$(if $(KBUILD_OUTPUT),, \
1c9e70a5 137 $(error failed to create output directory "$(saved-output)"))
1da177e4 138
0b35786d
MM
139PHONY += $(MAKECMDGOALS) sub-make
140
1cacc9ab 141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
16f89098 142 @:
0b35786d
MM
143
144sub-make: FORCE
745a2543 145 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
aa55c8e2 146 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
1da177e4
LT
147
148# Leave processing to above invocation of make
149skip-makefile := 1
150endif # ifneq ($(KBUILD_OUTPUT),)
151endif # ifeq ($(KBUILD_SRC),)
152
153# We process the rest of the Makefile if this is the final invocation of make
154ifeq ($(skip-makefile),)
155
7ff52571
MY
156# Do not print "Entering directory ...",
157# but we want to display it when entering to the output directory
158# so that IDEs/editors are able to understand relative filenames.
159MAKEFLAGS += --no-print-directory
160
aa55c8e2
MY
161# Call a source code checker (by default, "sparse") as part of the
162# C compilation.
163#
164# Use 'make C=1' to enable checking of only re-compiled files.
165# Use 'make C=2' to enable checking of *all* source files, regardless
166# of whether they are re-compiled or not.
167#
168# See the file "Documentation/sparse.txt" for more details, including
169# where to get the "sparse" utility.
170
171ifeq ("$(origin C)", "command line")
172 KBUILD_CHECKSRC = $(C)
173endif
174ifndef KBUILD_CHECKSRC
175 KBUILD_CHECKSRC = 0
176endif
177
178# Use make M=dir to specify directory of external module to build
179# Old syntax make ... SUBDIRS=$PWD is still supported
180# Setting the environment variable KBUILD_EXTMOD take precedence
181ifdef SUBDIRS
182 KBUILD_EXTMOD ?= $(SUBDIRS)
183endif
184
185ifeq ("$(origin M)", "command line")
186 KBUILD_EXTMOD := $(M)
187endif
188
1da177e4
LT
189# If building an external module we do not care about the all: rule
190# but instead _all depend on modules
4f193362 191PHONY += all
1da177e4
LT
192ifeq ($(KBUILD_EXTMOD),)
193_all: all
194else
195_all: modules
196endif
197
9da0763b
MM
198ifeq ($(KBUILD_SRC),)
199 # building in the source tree
200 srctree := .
201else
202 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203 # building in a subdirectory of the source tree
204 srctree := ..
205 else
206 srctree := $(KBUILD_SRC)
207 endif
208endif
7e1c0477 209objtree := .
1da177e4
LT
210src := $(srctree)
211obj := $(objtree)
212
0f558c33 213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
1da177e4 214
11294235 215export srctree objtree VPATH
1da177e4 216
1da177e4
LT
217
218# SUBARCH tells the usermode build what the underlying arch is. That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below. If a native build is happening,
38385f8f 221# then ARCH is assigned, getting whatever value it gets normally, and
1da177e4
LT
222# SUBARCH is subsequently ignored.
223
ffee0de4
DW
224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225 -e s/sun4u/sparc64/ \
1da177e4 226 -e s/arm.*/arm/ -e s/sa110/arm/ \
39990b5e 227 -e s/s390x/s390/ -e s/parisc64/parisc/ \
236b1957 228 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
f1b99392 229 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
1da177e4
LT
230
231# Cross compiling and selecting different set of gcc/bin-utils
232# ---------------------------------------------------------------------------
233#
234# When performing cross compilation for other architectures ARCH shall be set
235# to the target architecture. (See arch/* for the possibilities).
236# ARCH can be set during invocation of make:
237# make ARCH=ia64
238# Another way is to have ARCH set in the environment.
239# The default ARCH is the host where make is executed.
240
241# CROSS_COMPILE specify the prefix used for all executables used
242# during compilation. Only gcc and related bin-utils executables
243# are prefixed with $(CROSS_COMPILE).
244# CROSS_COMPILE can be set on the command line
245# make CROSS_COMPILE=ia64-linux-
246# Alternatively CROSS_COMPILE can be set in the environment.
84336466
RM
247# A third alternative is to store a setting in .config so that plain
248# "make" in the configured kernel build directory always uses that.
1da177e4
LT
249# Default value for CROSS_COMPILE is not to prefix executables
250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
2331d1a6 251ARCH ?= $(SUBARCH)
84336466 252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
1da177e4
LT
253
254# Architecture as present in compile.h
6752ed90
TG
255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
1da177e4 257
d746d647
SR
258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260 SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263 SRCARCH := x86
264endif
74b469f2 265
5e538790 266# Additional ARCH settings for sparc
e69f58c0
NK
267ifeq ($(ARCH),sparc32)
268 SRCARCH := sparc
269endif
a439fe51 270ifeq ($(ARCH),sparc64)
5e538790 271 SRCARCH := sparc
a439fe51 272endif
2fb9b1bd 273
3cc000b5
PM
274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276 SRCARCH := sh
277endif
278
18aecc2b 279# Additional ARCH settings for tile
6738d321
CM
280ifeq ($(ARCH),tilepro)
281 SRCARCH := tile
282endif
18aecc2b
CM
283ifeq ($(ARCH),tilegx)
284 SRCARCH := tile
285endif
286
5e538790
SR
287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
14cdd3c4 290KCONFIG_CONFIG ?= .config
41263fc6 291export KCONFIG_CONFIG
14cdd3c4 292
1da177e4
LT
293# SHELL used by kbuild
294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295 else if [ -x /bin/bash ]; then echo /bin/bash; \
296 else echo sh; fi ; fi)
297
070b98bf
SR
298HOSTCC = gcc
299HOSTCXX = g++
51b97e35 300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
070b98bf 301HOSTCXXFLAGS = -O2
1da177e4 302
61163efa
BW
303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
070b98bf
SR
308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
1da177e4
LT
310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
3fbb43df
MY
314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
1da177e4
LT
318
319ifeq ($(MAKECMDGOALS),modules)
320 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
3fbb43df
MY
323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
1da177e4
LT
326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328 KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332 KBUILD_MODULES := 1
333endif
334
e579d351 335export KBUILD_MODULES KBUILD_BUILTIN
1da177e4
LT
336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
61163efa
BW
338ifneq ($(CC),)
339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
340COMPILER := clang
341else
342COMPILER := gcc
343endif
344export COMPILER
345endif
1da177e4
LT
346
347# Look for make include files relative to root of kernel src
348MAKEFLAGS += --include-dir=$(srctree)
349
1cacc9ab
SR
350# We need some generic definitions (do not try to remake the file).
351$(srctree)/scripts/Kbuild.include: ;
15964864 352include $(srctree)/scripts/Kbuild.include
1da177e4
LT
353
354# Make variables (CC, etc...)
1da177e4
LT
355AS = $(CROSS_COMPILE)as
356LD = $(CROSS_COMPILE)ld
357CC = $(CROSS_COMPILE)gcc
358CPP = $(CC) -E
359AR = $(CROSS_COMPILE)ar
360NM = $(CROSS_COMPILE)nm
361STRIP = $(CROSS_COMPILE)strip
362OBJCOPY = $(CROSS_COMPILE)objcopy
363OBJDUMP = $(CROSS_COMPILE)objdump
364AWK = awk
365GENKSYMS = scripts/genksyms/genksyms
caa27b66 366INSTALLKERNEL := installkernel
1da177e4 367DEPMOD = /sbin/depmod
1da177e4 368PERL = perl
011bf125 369PYTHON = python
1da177e4
LT
370CHECK = sparse
371
80a7d1d9
HE
372CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373 -Wbitwise -Wno-return-void $(CF)
6588169d
SR
374CFLAGS_MODULE =
375AFLAGS_MODULE =
376LDFLAGS_MODULE =
1da177e4
LT
377CFLAGS_KERNEL =
378AFLAGS_KERNEL =
2521f2c2 379CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
1da177e4
LT
380
381
abbf1590
DH
382# Use USERINCLUDE when you must reference the UAPI directories only.
383USERINCLUDE := \
384 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
385 -Iarch/$(hdr-arch)/include/generated/uapi \
386 -I$(srctree)/include/uapi \
387 -Iinclude/generated/uapi \
388 -include $(srctree)/include/linux/kconfig.h
389
1da177e4
LT
390# Use LINUXINCLUDE when you must reference the include/ directory.
391# Needed to be compatible with the O= option
abbf1590
DH
392LINUXINCLUDE := \
393 -I$(srctree)/arch/$(hdr-arch)/include \
90ac086b 394 -Iarch/$(hdr-arch)/include/generated/uapi \
abbf1590
DH
395 -Iarch/$(hdr-arch)/include/generated \
396 $(if $(KBUILD_SRC), -I$(srctree)/include) \
397 -Iinclude \
398 $(USERINCLUDE)
1da177e4 399
d8672b40 400KBUILD_CPPFLAGS := -D__KERNEL__
1da177e4 401
a0f97e06 402KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
94bed2a9 403 -fno-strict-aliasing -fno-common \
a8735821 404 -Werror-implicit-function-declaration \
51b97e35
KS
405 -Wno-format-security \
406 -std=gnu89
a1c48bb1 407
80c00ba9
SR
408KBUILD_AFLAGS_KERNEL :=
409KBUILD_CFLAGS_KERNEL :=
222d394d 410KBUILD_AFLAGS := -D__ASSEMBLY__
6588169d
SR
411KBUILD_AFLAGS_MODULE := -DMODULE
412KBUILD_CFLAGS_MODULE := -DMODULE
413KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
1da177e4 414
f1d28fb0
RZ
415# Read KERNELRELEASE from include/config/kernel.release (if it exists)
416KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
cacd54ef 417KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
cb58455c 418
070b98bf 419export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
80ef88d6 420export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
caa27b66 421export CPP AR NM STRIP OBJCOPY OBJDUMP
011bf125 422export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
070b98bf 423export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
1da177e4 424
06c5040c 425export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
0b24becc 426export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
222d394d 427export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
6588169d 428export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
80c00ba9 429export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
40df759e 430export KBUILD_ARFLAGS
1da177e4
LT
431
432# When compiling out-of-tree modules, put MODVERDIR in the module
433# tree rather than in the kernel tree. The kernel tree might
434# even be read-only.
435export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
436
1da177e4
LT
437# Files to ignore in find ... statements
438
ae63b2d7
PB
439export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
440 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
441 -prune -o
450c6076
JJ
442export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443 --exclude CVS --exclude .pc --exclude .hg --exclude .git
1da177e4
LT
444
445# ===========================================================================
446# Rules shared between *config targets and build targets
447
448# Basic helpers built in scripts/
4f193362 449PHONY += scripts_basic
1da177e4
LT
450scripts_basic:
451 $(Q)$(MAKE) $(build)=scripts/basic
638adb05 452 $(Q)rm -f .tmp_quiet_recordmcount
1da177e4 453
cd05e6bd
JB
454# To avoid any implicit rule to kick in, define an empty command.
455scripts/basic/%: scripts_basic ;
456
4f193362 457PHONY += outputmakefile
fd5f0cd6
JB
458# outputmakefile generates a Makefile in the output directory, if using a
459# separate output directory. This allows convenient use of make in the
460# output directory.
1da177e4 461outputmakefile:
fd5f0cd6 462ifneq ($(KBUILD_SRC),)
92979997 463 $(Q)ln -fsn $(srctree) source
fd5f0cd6
JB
464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466endif
1da177e4 467
d8ecc5cd
SR
468# Support for using generic headers in asm-generic
469PHONY += asm-generic
470asm-generic:
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
3c5994c8
CM
472 src=asm obj=arch/$(SRCARCH)/include/generated/asm
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
d8ecc5cd 475
1da177e4
LT
476# To make sure we do not include .config for any of the *config targets
477# catch them early, and hand them over to scripts/kconfig/Makefile
478# It is allowed to specify more targets when calling make, including
479# mixing *config targets and build targets.
070b98bf 480# For example 'make oldconfig all'.
1da177e4
LT
481# Detect when mixed targets is specified, and make a second invocation
482# of make so .config is not included in this case either (for *config).
483
10b63956 484version_h := include/generated/uapi/linux/version.h
223c24a7 485old_version_h := include/linux/version.h
d183e6f5 486
3eb3c740 487no-dot-config-targets := clean mrproper distclean \
fbae4d58 488 cscope gtags TAGS tags help% %docs check% coccicheck \
d183e6f5 489 $(version_h) headers_% archheaders archscripts \
4aed2fd8 490 kernelversion %src-pkg
1da177e4
LT
491
492config-targets := 0
493mixed-targets := 0
494dot-config := 1
495
496ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498 dot-config := 0
499 endif
500endif
501
502ifeq ($(KBUILD_EXTMOD),)
503 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
504 config-targets := 1
d0d38cd9 505 ifneq ($(words $(MAKECMDGOALS)),1)
1da177e4
LT
506 mixed-targets := 1
507 endif
508 endif
509endif
510
511ifeq ($(mixed-targets),1)
512# ===========================================================================
513# We're called with mixed targets (*config and build targets).
514# Handle them one by one.
515
9319f453
MY
516PHONY += $(MAKECMDGOALS) __build_one_by_one
517
518$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
519 @:
520
521__build_one_by_one:
522 $(Q)set -e; \
523 for i in $(MAKECMDGOALS); do \
524 $(MAKE) -f $(srctree)/Makefile $$i; \
525 done
1da177e4
LT
526
527else
528ifeq ($(config-targets),1)
529# ===========================================================================
530# *config targets only - make sure prerequisites are updated, and descend
531# in scripts/kconfig to make the *config target
532
533# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534# KBUILD_DEFCONFIG may point out an alternative default configuration
535# used for 'make defconfig'
74b469f2 536include $(srctree)/arch/$(SRCARCH)/Makefile
61bee204 537export KBUILD_DEFCONFIG KBUILD_KCONFIG
1da177e4 538
31110ebb 539config: scripts_basic outputmakefile FORCE
31110ebb
SR
540 $(Q)$(MAKE) $(build)=scripts/kconfig $@
541
542%config: scripts_basic outputmakefile FORCE
1da177e4
LT
543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545else
546# ===========================================================================
547# Build targets only - this includes vmlinux, arch specific targets, clean
548# targets and others. In general all targets except *config targets.
549
550ifeq ($(KBUILD_EXTMOD),)
551# Additional helpers built in scripts/
552# Carefully list dependencies so we do not try to build scripts twice
070b98bf 553# in parallel
4f193362 554PHONY += scripts
a54292f5
AS
555scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
556 asm-generic
1da177e4
LT
557 $(Q)$(MAKE) $(build)=$(@)
558
1da177e4
LT
559# Objects we will link into vmlinux / subdirs we need to visit
560init-y := init/
4d2acfbf 561drivers-y := drivers/ sound/ firmware/
1da177e4
LT
562net-y := net/
563libs-y := lib/
564core-y := usr/
565endif # KBUILD_EXTMOD
566
567ifeq ($(dot-config),1)
9ee4e336
SR
568# Read in config
569-include include/config/auto.conf
1da177e4 570
9ee4e336 571ifeq ($(KBUILD_EXTMOD),)
1da177e4
LT
572# Read in dependencies to all Kconfig* files, make sure to run
573# oldconfig if changes are detected.
c955ccaf 574-include include/config/auto.conf.cmd
1da177e4 575
1da177e4 576# To avoid any implicit rule to kick in, define an empty command
14cdd3c4 577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
1da177e4 578
c955ccaf 579# If .config is newer than include/config/auto.conf, someone tinkered
752625cf 580# with it and forgot to run make oldconfig.
070b98bf 581# if auto.conf.cmd is missing then we are probably in a cleaned tree so
752625cf 582# we execute the config step to be sure to catch updated Kconfig files
bc081dd6 583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
1da177e4 584 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
3041e47e 585else
264a2683 586# external modules needs include/generated/autoconf.h and include/config/auto.conf
9ee4e336
SR
587# but do not care if they are up-to-date. Use auto.conf to trigger the test
588PHONY += include/config/auto.conf
589
590include/config/auto.conf:
264a2683 591 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
5369f550
MM
592 echo >&2; \
593 echo >&2 " ERROR: Kernel configuration is invalid."; \
594 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
595 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
596 echo >&2 ; \
9ee4e336
SR
597 /bin/false)
598
599endif # KBUILD_EXTMOD
c955ccaf 600
1da177e4
LT
601else
602# Dummy target needed, because used as prerequisite
c955ccaf 603include/config/auto.conf: ;
9ee4e336 604endif # $(dot-config)
1da177e4
LT
605
606# The all: target is the default when no target is given on the
607# command line.
608# This allow a user to issue only 'make' to build a kernel including modules
c8447161 609# Defaults to vmlinux, but the arch makefile usually adds further targets
1da177e4
LT
610all: vmlinux
611
a1c48bb1
GU
612include $(srctree)/arch/$(SRCARCH)/Makefile
613
614KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
615
1da177e4 616ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
e74fc973 617KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
1da177e4 618else
a0f97e06 619KBUILD_CFLAGS += -O2
1da177e4
LT
620endif
621
69102311
JK
622# Tell gcc to never replace conditional load with a non-conditional one
623KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
624
1873e870
AK
625ifdef CONFIG_READABLE_ASM
626# Disable optimizations that make assembler listings hard to read.
627# reorder blocks reorders the control in the function
628# ipa clone creates specialized cloned functions
629# partial inlining inlines only parts of functions
630KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631 $(call cc-option,-fno-ipa-cp-clone,) \
632 $(call cc-option,-fno-partial-inlining)
633endif
634
08f67461 635ifneq ($(CONFIG_FRAME_WARN),0)
35bb5b1e
AK
636KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637endif
638
19952a92 639# Handle stack protector mode.
1332429b
KC
640#
641# Since kbuild can potentially perform two passes (first with the old
642# .config values and then with updated .config values), we cannot error out
643# if a desired compiler option is unsupported. If we were to error, kbuild
644# could never get to the second pass and actually notice that we changed
645# the option to something that was supported.
646#
647# Additionally, we don't want to fallback and/or silently change which compiler
648# flags will be used, since that leads to producing kernels with different
649# security feature characteristics depending on the compiler used. ("But I
650# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651#
652# The middle ground is to warn here so that the failed option is obvious, but
653# to let the build fail with bad compiler flags so that we can't produce a
654# kernel when there is a CONFIG and compiler mismatch.
655#
8779657d 656ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
19952a92
KC
657 stackp-flag := -fstack-protector
658 ifeq ($(call cc-option, $(stackp-flag)),)
6c15b327 659 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
27b2a49a 660 -fstack-protector not supported by compiler)
19952a92 661 endif
6c15b327
JB
662else
663ifdef CONFIG_CC_STACKPROTECTOR_STRONG
8779657d
KC
664 stackp-flag := -fstack-protector-strong
665 ifeq ($(call cc-option, $(stackp-flag)),)
666 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667 -fstack-protector-strong not supported by compiler)
668 endif
19952a92
KC
669else
670 # Force off for distro compilers that enable stack protector by default.
671 stackp-flag := $(call cc-option, -fno-stack-protector)
5d707e9c 672endif
6c15b327 673endif
19952a92 674KBUILD_CFLAGS += $(stackp-flag)
e06b8b98 675
61163efa
BW
676ifeq ($(COMPILER),clang)
677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682# Quiet clang warning: comparison of unsigned expression < 0 is always false
683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
686# See modpost pattern 2
687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
26ea6bb1 688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
61163efa
BW
689else
690
af0e5d56
DJ
691# This warning generated too much noise in a regular build.
692# Use make W=1 to enable this warning (see scripts/Makefile.build)
8417da6f 693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
61163efa 694endif
af0e5d56 695
1da177e4 696ifdef CONFIG_FRAME_POINTER
a0f97e06 697KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
1da177e4 698else
7e9501fd
RV
699# Some targets (ARM with Thumb2, for example), can't be built with frame
700# pointers. For those, we don't have FUNCTION_TRACER automatically
701# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
702# incompatible with -fomit-frame-pointer with current GCC, so we don't use
703# -fomit-frame-pointer with FUNCTION_TRACER.
704ifndef CONFIG_FUNCTION_TRACER
a0f97e06 705KBUILD_CFLAGS += -fomit-frame-pointer
1da177e4 706endif
7e9501fd 707endif
1da177e4 708
2062afb4
LT
709KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
710
1da177e4 711ifdef CONFIG_DEBUG_INFO
866ced95
AK
712ifdef CONFIG_DEBUG_INFO_SPLIT
713KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
714else
a0f97e06 715KBUILD_CFLAGS += -g
866ced95 716endif
2288328c 717KBUILD_AFLAGS += -Wa,-gdwarf-2
1da177e4 718endif
bfaf2dd3
AK
719ifdef CONFIG_DEBUG_INFO_DWARF4
720KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
721endif
1da177e4 722
d6f4ceb7 723ifdef CONFIG_DEBUG_INFO_REDUCED
e82c4bb8
AK
724KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
725 $(call cc-option,-fno-var-tracking)
d6f4ceb7
AK
726endif
727
606576ce 728ifdef CONFIG_FUNCTION_TRACER
c0a80c0c
HC
729ifndef CC_FLAGS_FTRACE
730CC_FLAGS_FTRACE := -pg
731endif
732export CC_FLAGS_FTRACE
a2546fae
SR
733ifdef CONFIG_HAVE_FENTRY
734CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
735endif
c0a80c0c 736KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
a2546fae 737KBUILD_AFLAGS += $(CC_USING_FENTRY)
72441cb1 738ifdef CONFIG_DYNAMIC_FTRACE
cf4db259 739 ifdef CONFIG_HAVE_C_RECORDMCOUNT
72441cb1
SR
740 BUILD_C_RECORDMCOUNT := y
741 export BUILD_C_RECORDMCOUNT
742 endif
743endif
16444a8a
ACM
744endif
745
91341d4b
SR
746# We trigger additional mismatches with less inlining
747ifdef CONFIG_DEBUG_SECTION_MISMATCH
748KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
749endif
750
e8e69931 751# arch Makefile may override CC so keep this after arch Makefile is included
e8f5bdb0 752NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
e8e69931
SR
753CHECKFLAGS += $(NOSTDINC_FLAGS)
754
1da177e4 755# warn about C99 declaration after statement
a0f97e06 756KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
1da177e4 757
070b98bf 758# disable pointer signed / unsigned warnings in gcc 4.0
8417da6f 759KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
1da177e4 760
fe8d0a41 761# disable invalid "can't wrap" optimizations for signed / pointers
a137802e 762KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
d0115552 763
8f7f5c9f
AK
764# conserve stack if available
765KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
766
80970472
ST
767# disallow errors like 'EXPORT_GPL(foo);' with missing header
768KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
769
770# require functions to have arguments in prototypes, not empty 'int foo()'
771KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
772
fe7c36c7
JT
773# Prohibit date/time macros, which would make the build non-deterministic
774KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
775
40df759e
MM
776# use the deterministic mode of AR if available
777KBUILD_ARFLAGS := $(call ar-option,D)
778
bf5438fc
JB
779# check for 'asm goto'
780ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
781 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
782endif
783
0b24becc 784include $(srctree)/scripts/Makefile.kasan
a86fe353
MY
785include $(srctree)/scripts/Makefile.extrawarn
786
06c5040c 787# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
70cfe026
788KBUILD_CPPFLAGS += $(KCPPFLAGS)
789KBUILD_AFLAGS += $(KAFLAGS)
790KBUILD_CFLAGS += $(KCFLAGS)
52bcc330 791
18991197
RM
792# Use --build-id when available.
793LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
f86fd306 794 $(call cc-ldoption, -Wl$(comma)--build-id,))
6588169d 795KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
18991197
RM
796LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
797
5d7d18f5 798ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
d79a2719 799LDFLAGS_vmlinux += $(call ld-option, -X,)
5d7d18f5
DH
800endif
801
1da177e4 802# Default kernel image to build when no specific target is given.
070b98bf 803# KBUILD_IMAGE may be overruled on the command line or
1da177e4
LT
804# set in the environment
805# Also any assignments in arch/$(ARCH)/Makefile take precedence over
806# this default value
807export KBUILD_IMAGE ?= vmlinux
808
809#
810# INSTALL_PATH specifies where to place the updated kernel and system map
811# images. Default is /boot, but you can set it to other values
812export INSTALL_PATH ?= /boot
813
f4d4ffc0
JC
814#
815# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
816# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
817# an argument if needed. Otherwise it defaults to the kernel install path
818#
819export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
820
1da177e4
LT
821#
822# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
823# relocations required by build roots. This is not defined in the
070b98bf 824# makefile but the argument can be passed to make if needed.
1da177e4
LT
825#
826
df9df036 827MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1da177e4
LT
828export MODLIB
829
ac031f26 830#
3fbb43df
MY
831# INSTALL_MOD_STRIP, if defined, will cause modules to be
832# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
833# the default option --strip-debug will be used. Otherwise,
834# INSTALL_MOD_STRIP value will be used as the options to the strip command.
2ea03891 835
ac031f26
TT
836ifdef INSTALL_MOD_STRIP
837ifeq ($(INSTALL_MOD_STRIP),1)
2ea03891 838mod_strip_cmd = $(STRIP) --strip-debug
ac031f26 839else
2ea03891 840mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
ac031f26
TT
841endif # INSTALL_MOD_STRIP=1
842else
2ea03891 843mod_strip_cmd = true
ac031f26
TT
844endif # INSTALL_MOD_STRIP
845export mod_strip_cmd
846
beb50df3
BJ
847# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
848# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
849# or CONFIG_MODULE_COMPRESS_XZ.
850
851mod_compress_cmd = true
852ifdef CONFIG_MODULE_COMPRESS
853 ifdef CONFIG_MODULE_COMPRESS_GZIP
854 mod_compress_cmd = gzip -n
855 endif # CONFIG_MODULE_COMPRESS_GZIP
856 ifdef CONFIG_MODULE_COMPRESS_XZ
857 mod_compress_cmd = xz
858 endif # CONFIG_MODULE_COMPRESS_XZ
859endif # CONFIG_MODULE_COMPRESS
860export mod_compress_cmd
861
1bf49dd4 862# Select initial ramdisk compression format, default is gzip(1).
863# This shall be used by the dracut(8) tool while creating an initramfs image.
864#
7ac18156
JB
865INITRD_COMPRESS-y := gzip
866INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
867INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
868INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
869INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
870INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
b7000ade
LT
871# do not export INITRD_COMPRESS, since we didn't actually
872# choose a sane default compression above.
873# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
1da177e4 874
d9d8d7ed 875ifdef CONFIG_MODULE_SIG_ALL
e2a666d5
RR
876MODSECKEY = ./signing_key.priv
877MODPUBKEY = ./signing_key.x509
878export MODPUBKEY
4bc9410c 879mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
e2a666d5
RR
880else
881mod_sign_cmd = true
882endif
883export mod_sign_cmd
884
885
1da177e4 886ifeq ($(KBUILD_EXTMOD),)
3a65dfe8 887core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
1da177e4
LT
888
889vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
890 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
891 $(net-y) $(net-m) $(libs-y) $(libs-m)))
892
893vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
30142230 894 $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
1da177e4
LT
895
896init-y := $(patsubst %/, %/built-in.o, $(init-y))
897core-y := $(patsubst %/, %/built-in.o, $(core-y))
898drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
899net-y := $(patsubst %/, %/built-in.o, $(net-y))
900libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
901libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
902libs-y := $(libs-y1) $(libs-y2)
903
1f2bfbd0 904# Externally visible symbols (used by link-vmlinux.sh)
95698570
SR
905export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
906export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
907export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1f2bfbd0 908export LDFLAGS_vmlinux
6615d6c3
MM
909# used by scripts/pacmage/Makefile
910export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
9bb48247 911
1f2bfbd0 912vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
1da177e4 913
1f2bfbd0
SR
914# Final link of vmlinux
915 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
916quiet_cmd_link-vmlinux = LINK $@
1da177e4 917
1f2bfbd0
SR
918# Include targets which we want to
919# execute if the rest of the kernel build went well.
920vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
0f836e5f 921ifdef CONFIG_HEADERS_CHECK
0e7af8d0 922 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
267c4025
MD
923endif
924ifdef CONFIG_SAMPLES
925 $(Q)$(MAKE) $(build)=samples
3794f3e8
RD
926endif
927ifdef CONFIG_BUILD_DOCSRC
928 $(Q)$(MAKE) $(build)=Documentation
3ee7b3fa
JK
929endif
930ifdef CONFIG_GDB_SCRIPTS
931 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
0f836e5f 932endif
1f2bfbd0 933 +$(call if_changed,link-vmlinux)
741f98fe 934
38385f8f 935# The actual objects are generated when descending,
1da177e4 936# make sure no implicit rule kicks in
1f2bfbd0 937$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1da177e4
LT
938
939# Handle descending into subdirectories listed in $(vmlinux-dirs)
940# Preset locale variables to speed up the build process. Limit locale
941# tweaks to this spot to avoid wrong language settings when running
942# make menuconfig etc.
943# Error messages still appears in the original language
944
4f193362 945PHONY += $(vmlinux-dirs)
5bb78269 946$(vmlinux-dirs): prepare scripts
1da177e4
LT
947 $(Q)$(MAKE) $(build)=$@
948
0d0e7718
MM
949define filechk_kernel.release
950 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
951endef
952
83a35e36 953# Store (new) KERNELRELEASE string in include/config/kernel.release
f1d28fb0 954include/config/kernel.release: include/config/auto.conf FORCE
0d0e7718 955 $(call filechk,kernel.release)
cb58455c
SR
956
957
1da177e4 958# Things we need to do before we recursively start building the kernel
5bb78269
SR
959# or the modules are listed in "prepare".
960# A multi level approach is used. prepareN is processed before prepareN-1.
961# archprepare is used in arch Makefiles and when processed asm symlink,
962# version.h and scripts_basic is processed / created.
1da177e4 963
5bb78269 964# Listed in dependency order
4f193362 965PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
5bb78269 966
86feeaa8 967# prepare3 is used to check if we are building in a separate output directory,
1da177e4
LT
968# and if so do:
969# 1) Check that make has not been executed in the kernel src $(srctree)
f1d28fb0 970prepare3: include/config/kernel.release
1da177e4 971ifneq ($(KBUILD_SRC),)
fd54f502 972 @$(kecho) ' Using $(srctree) as source for kernel'
c955ccaf 973 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
5369f550
MM
974 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
975 echo >&2 " in the '$(srctree)' directory.";\
1da177e4
LT
976 /bin/false; \
977 fi;
1da177e4
LT
978endif
979
86feeaa8 980# prepare2 creates a makefile if using a separate output directory
d8ecc5cd 981prepare2: prepare3 outputmakefile asm-generic
1da177e4 982
d183e6f5 983prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
f7f16b77 984 include/config/auto.conf
7bb9d092 985 $(cmd_crmodverdir)
1da177e4 986
6520fe55 987archprepare: archheaders archscripts prepare1 scripts_basic
5bb78269
SR
988
989prepare0: archprepare FORCE
8d36a623 990 $(Q)$(MAKE) $(build)=.
86feeaa8 991
1da177e4 992# All the preparing..
d395efb5 993prepare: prepare0
1da177e4 994
1da177e4
LT
995# Generate some files
996# ---------------------------------------------------------------------------
997
998# KERNELRELEASE can change from a few different places, meaning version.h
999# needs to be updated, so this check is forced on all builds
1000
1001uts_len := 64
63104eec
SR
1002define filechk_utsrelease.h
1003 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1004 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1005 exit 1; \
1006 fi; \
1007 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1008endef
1da177e4
LT
1009
1010define filechk_version.h
450c6076
JJ
1011 (echo \#define LINUX_VERSION_CODE $(shell \
1012 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
63104eec 1013 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1da177e4
LT
1014endef
1015
d183e6f5 1016$(version_h): $(srctree)/Makefile FORCE
1da177e4 1017 $(call filechk,version.h)
223c24a7 1018 $(Q)rm -f $(old_version_h)
1da177e4 1019
273b281f 1020include/generated/utsrelease.h: include/config/kernel.release FORCE
63104eec
SR
1021 $(call filechk,utsrelease.h)
1022
179efcb4
VN
1023PHONY += headerdep
1024headerdep:
9663d989
PF
1025 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1026 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
179efcb4 1027
1da177e4
LT
1028# ---------------------------------------------------------------------------
1029
4f193362 1030PHONY += depend dep
1da177e4
LT
1031depend dep:
1032 @echo '*** Warning: make $@ is unnecessary now.'
1033
88ecf814
DW
1034# ---------------------------------------------------------------------------
1035# Firmware install
1036INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1037export INSTALL_FW_PATH
1038
1039PHONY += firmware_install
1040firmware_install: FORCE
1041 @mkdir -p $(objtree)/firmware
1042 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1043
8d730cfb
DW
1044# ---------------------------------------------------------------------------
1045# Kernel headers
8d730cfb 1046
e6883b18
SR
1047#Default location for installed headers
1048export INSTALL_HDR_PATH = $(objtree)/usr
6d716275 1049
2fb9b1bd
SR
1050# If we do an all arch process set dst to asm-$(hdr-arch)
1051hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
e6883b18 1052
052ad274
PA
1053PHONY += archheaders
1054archheaders:
1055
6520fe55
PA
1056PHONY += archscripts
1057archscripts:
1058
e6883b18 1059PHONY += __headers
d183e6f5 1060__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
e1b702cf 1061 $(Q)$(MAKE) $(build)=scripts build_unifdef
e6883b18
SR
1062
1063PHONY += headers_install_all
2fb9b1bd
SR
1064headers_install_all:
1065 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
6d716275 1066
8d730cfb 1067PHONY += headers_install
e6883b18 1068headers_install: __headers
10b63956
DH
1069 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1070 $(error Headers not exportable for the $(SRCARCH) architecture))
1071 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1072 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
8d730cfb 1073
1f85712e
MF
1074PHONY += headers_check_all
1075headers_check_all: headers_install_all
2fb9b1bd 1076 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1f85712e 1077
68475359
DW
1078PHONY += headers_check
1079headers_check: headers_install
10b63956
DH
1080 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1081 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
68475359 1082
5a5da78b
SK
1083# ---------------------------------------------------------------------------
1084# Kernel selftest
1085
1086PHONY += kselftest
1087kselftest:
1088 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1089
1da177e4
LT
1090# ---------------------------------------------------------------------------
1091# Modules
1092
1093ifdef CONFIG_MODULES
1094
070b98bf 1095# By default, build modules as well
1da177e4 1096
73d1393e 1097all: modules
1da177e4 1098
3fbb43df 1099# Build modules
551559e1 1100#
3fbb43df
MY
1101# A module can be listed more than once in obj-m resulting in
1102# duplicate lines in modules.order files. Those are removed
1103# using awk while concatenating to the final file.
1da177e4 1104
4f193362 1105PHONY += modules
2da30e70 1106modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
551559e1 1107 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
fd54f502 1108 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1109 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
44463f7d 1110 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1da177e4 1111
a6c36632
MM
1112modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1113 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1114
73d1393e 1115%/modules.builtin: include/config/auto.conf
a6c36632
MM
1116 $(Q)$(MAKE) $(modbuiltin)=$*
1117
1da177e4
LT
1118
1119# Target to prepare building external modules
4f193362 1120PHONY += modules_prepare
5bb78269 1121modules_prepare: prepare scripts
1da177e4
LT
1122
1123# Target to install modules
4f193362 1124PHONY += modules_install
1da177e4
LT
1125modules_install: _modinst_ _modinst_post
1126
4f193362 1127PHONY += _modinst_
2da30e70 1128_modinst_:
1da177e4
LT
1129 @rm -rf $(MODLIB)/kernel
1130 @rm -f $(MODLIB)/source
1131 @mkdir -p $(MODLIB)/kernel
890676c6 1132 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1da177e4
LT
1133 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1134 rm -f $(MODLIB)/build ; \
7e1c0477 1135 ln -s $(CURDIR) $(MODLIB)/build ; \
1da177e4 1136 fi
551559e1 1137 @cp -f $(objtree)/modules.order $(MODLIB)/
bc081dd6 1138 @cp -f $(objtree)/modules.builtin $(MODLIB)/
b805aa0e 1139 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1140
50a8ec31 1141# This depmod is only for convenience to give the initial
1da177e4
LT
1142# boot a modules.dep even before / is mounted read-write. However the
1143# boot script depmod is the master version.
4f193362 1144PHONY += _modinst_post
6d128e1e 1145_modinst_post: _modinst_
88ecf814 1146 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
50a8ec31 1147 $(call cmd,depmod)
1da177e4 1148
d890f510
JB
1149ifeq ($(CONFIG_MODULE_SIG), y)
1150PHONY += modules_sign
1151modules_sign:
1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1153endif
1154
1da177e4
LT
1155else # CONFIG_MODULES
1156
1157# Modules not configured
1158# ---------------------------------------------------------------------------
1159
1160modules modules_install: FORCE
5369f550
MM
1161 @echo >&2
1162 @echo >&2 "The present kernel configuration has modules disabled."
1163 @echo >&2 "Type 'make config' and enable loadable module support."
1164 @echo >&2 "Then build a kernel with module support enabled."
1165 @echo >&2
1da177e4
LT
1166 @exit 1
1167
1168endif # CONFIG_MODULES
1169
1da177e4
LT
1170###
1171# Cleaning is done on three levels.
1172# make clean Delete most generated files
1173# Leave enough to build external modules
1174# make mrproper Delete the current configuration, and all generated files
1175# make distclean Remove editor backup files, patch leftover files and the like
1176
1177# Directories & files removed with 'make clean'
1178CLEAN_DIRS += $(MODVERDIR)
1da177e4
LT
1179
1180# Directories & files removed with 'make mrproper'
d8ecc5cd 1181MRPROPER_DIRS += include/config usr/include include/generated \
3fbb43df 1182 arch/*/include/generated .tmp_objdiff
c22bd32c 1183MRPROPER_FILES += .config .config.old .version .old_version \
d5b71936
RR
1184 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1185 signing_key.priv signing_key.x509 x509.genkey \
1186 extra_certificates signing_key.x509.keyid \
3ee7b3fa 1187 signing_key.x509.signer vmlinux-gdb.py
1da177e4
LT
1188
1189# clean - Delete most, but leave enough to build external modules
1190#
1191clean: rm-dirs := $(CLEAN_DIRS)
1192clean: rm-files := $(CLEAN_FILES)
fb68d4be 1193clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1da177e4 1194
bd1ee804 1195PHONY += $(clean-dirs) clean archclean vmlinuxclean
1da177e4
LT
1196$(clean-dirs):
1197 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1198
bd1ee804
PM
1199vmlinuxclean:
1200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1201
1202clean: archclean vmlinuxclean
1da177e4
LT
1203
1204# mrproper - Delete all generated files, including .config
1205#
1206mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1207mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1208mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1209
4f193362 1210PHONY += $(mrproper-dirs) mrproper archmrproper
1da177e4
LT
1211$(mrproper-dirs):
1212 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1213
1214mrproper: clean archmrproper $(mrproper-dirs)
1215 $(call cmd,rmdirs)
1216 $(call cmd,rmfiles)
1217
1218# distclean
1219#
4f193362 1220PHONY += distclean
1da177e4
LT
1221
1222distclean: mrproper
1223 @find $(srctree) $(RCS_FIND_IGNORE) \
070b98bf 1224 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1da177e4 1225 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
a03fcb50 1226 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1da177e4
LT
1227 -type f -print | xargs rm -f
1228
1229
1230# Packaging of the kernel to various formats
1231# ---------------------------------------------------------------------------
1232# rpm target kept for backward compatibility
c79624c1 1233package-dir := scripts/package
1da177e4 1234
bafb6747
ACM
1235%src-pkg: FORCE
1236 $(Q)$(MAKE) $(build)=$(package-dir) $@
031ecc6d 1237%pkg: include/config/kernel.release FORCE
6c2133e1 1238 $(Q)$(MAKE) $(build)=$(package-dir) $@
031ecc6d 1239rpm: include/config/kernel.release FORCE
6c2133e1 1240 $(Q)$(MAKE) $(build)=$(package-dir) $@
1da177e4
LT
1241
1242
1243# Brief documentation of the typical targets used
1244# ---------------------------------------------------------------------------
1245
5dffbe81 1246boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
a1e7b7bb 1247boards := $(sort $(notdir $(boards)))
5dffbe81
SB
1248board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1249board-dirs := $(sort $(notdir $(board-dirs:/=)))
1da177e4
LT
1250
1251help:
1252 @echo 'Cleaning targets:'
5ea084ef 1253 @echo ' clean - Remove most generated files but keep the config and'
5cc8d246 1254 @echo ' enough build support to build external modules'
5ea084ef 1255 @echo ' mrproper - Remove all generated files + config + various backup files'
5cc8d246 1256 @echo ' distclean - mrproper + remove editor backup and patch files'
1da177e4
LT
1257 @echo ''
1258 @echo 'Configuration targets:'
1259 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1260 @echo ''
1261 @echo 'Other generic targets:'
1262 @echo ' all - Build all targets marked with [*]'
1263 @echo '* vmlinux - Build the bare kernel'
1264 @echo '* modules - Build all modules'
9cc5d74c 1265 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
88ecf814
DW
1266 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1267 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1da177e4 1268 @echo ' dir/ - Build all files in dir and below'
62718979
JP
1269 @echo ' dir/file.[oisS] - Build specified target only'
1270 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1271 @echo ' (requires a recent binutils and recent build (System.map))'
155ad605 1272 @echo ' dir/file.ko - Build module including final link'
c4d5ee67 1273 @echo ' modules_prepare - Set up for building external modules'
1da177e4
LT
1274 @echo ' tags/TAGS - Generate tags file for editors'
1275 @echo ' cscope - Generate cscope index'
f4ed1009 1276 @echo ' gtags - Generate GNU GLOBAL index'
3f1d9a6c
MM
1277 @echo ' kernelrelease - Output the release version string (use with make -s)'
1278 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1279 @echo ' image_name - Output the image name (use with make -s)'
2fb9b1bd 1280 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
59df3230 1281 echo ' (default: $(INSTALL_HDR_PATH))'; \
2fb9b1bd 1282 echo ''
1da177e4 1283 @echo 'Static analysers'
1da177e4
LT
1284 @echo ' checkstack - Generate a list of stack hogs'
1285 @echo ' namespacecheck - Name space analysis on compiled kernel'
aa025e7d 1286 @echo ' versioncheck - Sanity check on version.h usage'
ec2d987f 1287 @echo ' includecheck - Check for duplicate included header files'
295ac051 1288 @echo ' export_report - List the usages of all exported symbols'
179efcb4 1289 @echo ' headers_check - Sanity check on exported headers'
74425eee
NP
1290 @echo ' headerdep - Detect inclusion cycles in headers'
1291 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1292 @echo ''
5a5da78b
SK
1293 @echo 'Kernel selftest'
1294 @echo ' kselftest - Build and run kernel selftest (run as root)'
1295 @echo ' Build, install, and boot kernel before'
1296 @echo ' running kselftest on it'
1297 @echo ''
1da177e4 1298 @echo 'Kernel packaging:'
6c2133e1 1299 @$(MAKE) $(build)=$(package-dir) help
1da177e4
LT
1300 @echo ''
1301 @echo 'Documentation targets:'
1302 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1303 @echo ''
01dee188 1304 @echo 'Architecture specific targets ($(SRCARCH)):'
1da177e4 1305 @$(if $(archhelp),$(archhelp),\
01dee188 1306 echo ' No architecture specific help defined for $(SRCARCH)')
1da177e4
LT
1307 @echo ''
1308 @$(if $(boards), \
1309 $(foreach b, $(boards), \
1310 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1311 echo '')
5dffbe81
SB
1312 @$(if $(board-dirs), \
1313 $(foreach b, $(board-dirs), \
1314 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1315 printf " %-16s - Show all of the above\\n" help-boards; \
1316 echo '')
1da177e4
LT
1317
1318 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
45d506bd 1319 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1da177e4 1320 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
701842e3
DK
1321 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1322 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
af07ce3e 1323 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
28bc20dc
SR
1324 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1325 @echo ' 1: warnings which may be relevant and do not occur too often'
1326 @echo ' 2: warnings which occur quite often but may still be relevant'
1327 @echo ' 3: more obscure warnings, can most likely be ignored'
a6de553d 1328 @echo ' Multiple levels can be combined with W=12 or W=123'
1da177e4
LT
1329 @echo ''
1330 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1331 @echo 'For further info see the ./README file'
1332
1333
5dffbe81
SB
1334help-board-dirs := $(addprefix help-,$(board-dirs))
1335
1336help-boards: $(help-board-dirs)
1337
fbae4d58 1338boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
5dffbe81
SB
1339
1340$(help-board-dirs): help-%:
1341 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1342 @$(if $(boards-per-dir), \
1343 $(foreach b, $(boards-per-dir), \
1344 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1345 echo '')
1346
1347
1da177e4
LT
1348# Documentation targets
1349# ---------------------------------------------------------------------------
1350%docs: scripts_basic FORCE
bffd2020 1351 $(Q)$(MAKE) $(build)=scripts build_docproc
1da177e4
LT
1352 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1353
1354else # KBUILD_EXTMOD
1355
1356###
1357# External module support.
1358# When building external modules the kernel used as basis is considered
1359# read-only, and no consistency checks are made and the make
1360# system is not used on the basis kernel. If updates are required
1361# in the basis kernel ordinary make commands (without M=...) must
1362# be used.
1363#
1364# The following are the only valid targets when building external
1365# modules.
1366# make M=dir clean Delete all automatically generated files
1367# make M=dir modules Make all modules in specified dir
1368# make M=dir Same as 'make M=dir modules'
1369# make M=dir modules_install
070b98bf 1370# Install the modules built in the module directory
1da177e4
LT
1371# Assumes install directory is already created
1372
1373# We are always building modules
1374KBUILD_MODULES := 1
4f193362 1375PHONY += crmodverdir
1da177e4 1376crmodverdir:
7bb9d092 1377 $(cmd_crmodverdir)
1da177e4 1378
4f193362 1379PHONY += $(objtree)/Module.symvers
1da177e4
LT
1380$(objtree)/Module.symvers:
1381 @test -e $(objtree)/Module.symvers || ( \
1382 echo; \
1383 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1384 echo " is missing; modules will have no dependencies and modversions."; \
1385 echo )
1386
1387module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
4f193362 1388PHONY += $(module-dirs) modules
1da177e4
LT
1389$(module-dirs): crmodverdir $(objtree)/Module.symvers
1390 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1391
1392modules: $(module-dirs)
fd54f502 1393 @$(kecho) ' Building modules, stage 2.';
b805aa0e 1394 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1da177e4 1395
4f193362 1396PHONY += modules_install
a67dc21a 1397modules_install: _emodinst_ _emodinst_post
e6304663 1398
4f193362
PS
1399install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1400PHONY += _emodinst_
a67dc21a 1401_emodinst_:
a67dc21a 1402 $(Q)mkdir -p $(MODLIB)/$(install-dir)
b805aa0e 1403 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1da177e4 1404
4f193362 1405PHONY += _emodinst_post
a67dc21a
SR
1406_emodinst_post: _emodinst_
1407 $(call cmd,depmod)
1408
1da177e4
LT
1409clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1410
4f193362 1411PHONY += $(clean-dirs) clean
1da177e4
LT
1412$(clean-dirs):
1413 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1414
1415clean: rm-dirs := $(MODVERDIR)
88d7be03 1416clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1da177e4
LT
1417
1418help:
1419 @echo ' Building external modules.'
1420 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1421 @echo ''
1422 @echo ' modules - default target, build the module(s)'
1423 @echo ' modules_install - install the module'
1424 @echo ' clean - remove generated files in module directory only'
1425 @echo ''
06300b21
SR
1426
1427# Dummies...
4f193362 1428PHONY += prepare scripts
06300b21
SR
1429prepare: ;
1430scripts: ;
1da177e4
LT
1431endif # KBUILD_EXTMOD
1432
88d7be03
MM
1433clean: $(clean-dirs)
1434 $(call cmd,rmdirs)
1435 $(call cmd,rmfiles)
43f67c98 1436 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
88d7be03 1437 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
addbcdbb 1438 -o -name '*.ko.*' \
866ced95 1439 -o -name '*.dwo' \
88d7be03
MM
1440 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1441 -o -name '*.symtypes' -o -name 'modules.order' \
1442 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1443 -o -name '*.gcno' \) -type f -print | xargs rm -f
1444
1da177e4
LT
1445# Generate tags for editors
1446# ---------------------------------------------------------------------------
a680eedc
SR
1447quiet_cmd_tags = GEN $@
1448 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1da177e4 1449
f4ed1009 1450tags TAGS cscope gtags: FORCE
1da177e4
LT
1451 $(call cmd,tags)
1452
1da177e4
LT
1453# Scripts to check various things for consistency
1454# ---------------------------------------------------------------------------
1455
279f3dd3
PF
1456PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1457
1da177e4 1458includecheck:
436f876c 1459 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1460 -name '*.[hcS]' -type f -print | sort \
80007434 1461 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1da177e4
LT
1462
1463versioncheck:
2ee2d292 1464 find $(srctree)/* $(RCS_FIND_IGNORE) \
1da177e4 1465 -name '*.[hcS]' -type f -print | sort \
80007434 1466 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1da177e4 1467
74425eee
NP
1468coccicheck:
1469 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1470
1da177e4
LT
1471namespacecheck:
1472 $(PERL) $(srctree)/scripts/namespace.pl
1473
295ac051
AB
1474export_report:
1475 $(PERL) $(srctree)/scripts/export_report.pl
1476
1da177e4
LT
1477endif #ifeq ($(config-targets),1)
1478endif #ifeq ($(mixed-targets),1)
1479
c398ff00 1480PHONY += checkstack kernelrelease kernelversion image_name
e3ccf6e3 1481
011e3a9a
JD
1482# UML needs a little special treatment here. It wants to use the host
1483# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1484# else wants $(ARCH), including people doing cross-builds, which means
1485# that $(SUBARCH) doesn't work here.
1486ifeq ($(ARCH), um)
1487CHECKSTACK_ARCH := $(SUBARCH)
1488else
1489CHECKSTACK_ARCH := $(ARCH)
1490endif
1da177e4
LT
1491checkstack:
1492 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
011e3a9a 1493 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1da177e4 1494
7b8ea53d
AW
1495kernelrelease:
1496 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
01ab1788 1497
cb58455c 1498kernelversion:
2244cbd8 1499 @echo $(KERNELVERSION)
1da177e4 1500
c398ff00
MM
1501image_name:
1502 @echo $(KBUILD_IMAGE)
1503
ea01fa9f
BP
1504# Clear a bunch of variables before executing the submake
1505tools/: FORCE
bf35182f 1506 $(Q)mkdir -p $(objtree)/tools
a50e4333 1507 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
ea01fa9f
BP
1508
1509tools/%: FORCE
bf35182f 1510 $(Q)mkdir -p $(objtree)/tools
a50e4333 1511 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
ea01fa9f 1512
06300b21
SR
1513# Single targets
1514# ---------------------------------------------------------------------------
bc2546a6 1515# Single targets are compatible with:
e1b8513d 1516# - build with mixed source and output
bc2546a6
SR
1517# - build with separate output dir 'make O=...'
1518# - external modules
1519#
1520# target-dir => where to store outputfile
1521# build-dir => directory in kernel source tree to use
1522
1523ifeq ($(KBUILD_EXTMOD),)
aa360879 1524 build-dir = $(patsubst %/,%,$(dir $@))
bc2546a6
SR
1525 target-dir = $(dir $@)
1526else
1527 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1528 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1529 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1530endif
1531
f6ecebd6 1532%.s: %.c prepare scripts FORCE
bc2546a6 1533 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1534%.i: %.c prepare scripts FORCE
bc2546a6 1535 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1536%.o: %.c prepare scripts FORCE
bc2546a6 1537 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1538%.lst: %.c prepare scripts FORCE
bc2546a6 1539 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1540%.s: %.S prepare scripts FORCE
bc2546a6 1541 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
f6ecebd6 1542%.o: %.S prepare scripts FORCE
bc2546a6 1543 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
15fde675
AG
1544%.symtypes: %.c prepare scripts FORCE
1545 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
06300b21 1546
bc2546a6 1547# Modules
31110ebb
SR
1548/: prepare scripts FORCE
1549 $(cmd_crmodverdir)
1550 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1551 $(build)=$(build-dir)
8e2faea8
PF
1552# Make sure the latest headers are built for Documentation
1553Documentation/: headers_install
31110ebb 1554%/: prepare scripts FORCE
7bb9d092 1555 $(cmd_crmodverdir)
06300b21 1556 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6
SR
1557 $(build)=$(build-dir)
1558%.ko: prepare scripts FORCE
7bb9d092 1559 $(cmd_crmodverdir)
06300b21 1560 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
bc2546a6 1561 $(build)=$(build-dir) $(@:.ko=.o)
b805aa0e 1562 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
06300b21 1563
38385f8f 1564# FIXME Should go into a make.lib or something
1da177e4
LT
1565# ===========================================================================
1566
1567quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1568 cmd_rmdirs = rm -rf $(rm-dirs)
1569
1570quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1571 cmd_rmfiles = rm -f $(rm-files)
1572
bc3c26fe 1573# Run depmod only if we have System.map and depmod is executable
50a8ec31 1574quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
569658dd 1575 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
b92021b0 1576 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
50a8ec31 1577
7bb9d092 1578# Create temporary dir for module support files
ab19f879
SR
1579# clean it up only when building all modules
1580cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1581 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1da177e4 1582
1da177e4
LT
1583# read all saved command lines
1584
1585targets := $(wildcard $(sort $(targets)))
1586cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1587
1588ifneq ($(cmd_files),)
1589 $(cmd_files): ; # Do not try to update included dependency files
1590 include $(cmd_files)
1591endif
1592
1da177e4
LT
1593endif # skip-makefile
1594
4f193362 1595PHONY += FORCE
1da177e4 1596FORCE:
4f193362 1597
4f193362 1598# Declare the contents of the .PHONY variable as phony. We keep that
fe8d0a41 1599# information in a variable so we can use it in if_changed and friends.
4f193362 1600.PHONY: $(PHONY)