Makefile (0663c68c) Makefile (93fdddfe)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 7
4SUBLEVEL = 0
5EXTRAVERSION = -rc5
6NAME = Kleptomaniac Octopus
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# We are using a recursive build, so we need to do a little thinking
19# to get the ordering right.
20#
21# Most importantly: sub-Makefiles should only ever modify files in
22# their own directory. If in some directory we have a dependency on
23# a file in another dir (which doesn't happen often, but it's often
24# unavoidable when linking the built-in.a targets which finally
25# turn into vmlinux), we will call a sub make in that other dir, and
26# after that we are sure that everything which is in that other dir
27# is now up to date.
28#
29# The only cases where we need to modify files which have global
30# effects are thus separated out and done before the recursive
31# descending is started. They are now explicitly listed as the
32# prepare rule.
33
34ifneq ($(sub_make_done),1)
35
36# Do not use make's built-in rules and variables
37# (this increases performance and avoids hard-to-debug behaviour)
38MAKEFLAGS += -rR
39
40# Avoid funny character set dependencies
41unexport LC_ALL
42LC_COLLATE=C
43LC_NUMERIC=C
44export LC_COLLATE LC_NUMERIC
45
46# Avoid interference with shell env settings
47unexport GREP_OPTIONS
48
49# Beautify output
50# ---------------------------------------------------------------------------
51#
52# Normally, we echo the whole command before executing it. By making
53# that echo $($(quiet)$(cmd)), we now have the possibility to set
54# $(quiet) to choose other forms of output instead, e.g.
55#
56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58#
59# If $(quiet) is empty, the whole command will be printed.
60# If it is set to "quiet_", only the short version will be printed.
61# If it is set to "silent_", nothing will be printed at all, since
62# the variable $(silent_cmd_cc_o_c) doesn't exist.
63#
64# A simple variant is to prefix commands with $(Q) - that's useful
65# for commands that shall be hidden in non-verbose mode.
66#
67# $(Q)ln $@ :<
68#
69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
71# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
72#
73# To put more focus on warnings, be less verbose as default
74# Use 'make V=1' to see the full commands
75
76ifeq ("$(origin V)", "command line")
77 KBUILD_VERBOSE = $(V)
78endif
79ifndef KBUILD_VERBOSE
80 KBUILD_VERBOSE = 0
81endif
82
83ifeq ($(KBUILD_VERBOSE),1)
84 quiet =
85 Q =
86else
87 quiet=quiet_
88 Q = @
89endif
90
91# If the user is running make -s (silent mode), suppress echoing of
92# commands
93
94ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
95 quiet=silent_
96endif
97
98export quiet Q KBUILD_VERBOSE
99
100# Kbuild will save output files in the current working directory.
101# This does not need to match to the root of the kernel source tree.
102#
103# For example, you can do this:
104#
105# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106#
107# If you want to save output files in a different location, there are
108# two syntaxes to specify it.
109#
110# 1) O=
111# Use "make O=dir/to/store/output/files/"
112#
113# 2) Set KBUILD_OUTPUT
114# Set the environment variable KBUILD_OUTPUT to point to the output directory.
115# export KBUILD_OUTPUT=dir/to/store/output/files/; make
116#
117# The O= assignment takes precedence over the KBUILD_OUTPUT environment
118# variable.
119
120# Do we want to change the working directory?
121ifeq ("$(origin O)", "command line")
122 KBUILD_OUTPUT := $(O)
123endif
124
125ifneq ($(KBUILD_OUTPUT),)
126# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
127# expand a shell special character '~'. We use a somewhat tedious way here.
128abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
129$(if $(abs_objtree),, \
130 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
131
132# $(realpath ...) resolves symlinks
133abs_objtree := $(realpath $(abs_objtree))
134else
135abs_objtree := $(CURDIR)
136endif # ifneq ($(KBUILD_OUTPUT),)
137
138ifeq ($(abs_objtree),$(CURDIR))
139# Suppress "Entering directory ..." unless we are changing the work directory.
140MAKEFLAGS += --no-print-directory
141else
142need-sub-make := 1
143endif
144
145abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
146
147ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
148$(error source directory cannot contain spaces or colons)
149endif
150
151ifneq ($(abs_srctree),$(abs_objtree))
152# Look for make include files relative to root of kernel src
153#
154# This does not become effective immediately because MAKEFLAGS is re-parsed
155# once after the Makefile is read. We need to invoke sub-make.
156MAKEFLAGS += --include-dir=$(abs_srctree)
157need-sub-make := 1
158endif
159
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 7
4SUBLEVEL = 0
5EXTRAVERSION = -rc5
6NAME = Kleptomaniac Octopus
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# We are using a recursive build, so we need to do a little thinking
19# to get the ordering right.
20#
21# Most importantly: sub-Makefiles should only ever modify files in
22# their own directory. If in some directory we have a dependency on
23# a file in another dir (which doesn't happen often, but it's often
24# unavoidable when linking the built-in.a targets which finally
25# turn into vmlinux), we will call a sub make in that other dir, and
26# after that we are sure that everything which is in that other dir
27# is now up to date.
28#
29# The only cases where we need to modify files which have global
30# effects are thus separated out and done before the recursive
31# descending is started. They are now explicitly listed as the
32# prepare rule.
33
34ifneq ($(sub_make_done),1)
35
36# Do not use make's built-in rules and variables
37# (this increases performance and avoids hard-to-debug behaviour)
38MAKEFLAGS += -rR
39
40# Avoid funny character set dependencies
41unexport LC_ALL
42LC_COLLATE=C
43LC_NUMERIC=C
44export LC_COLLATE LC_NUMERIC
45
46# Avoid interference with shell env settings
47unexport GREP_OPTIONS
48
49# Beautify output
50# ---------------------------------------------------------------------------
51#
52# Normally, we echo the whole command before executing it. By making
53# that echo $($(quiet)$(cmd)), we now have the possibility to set
54# $(quiet) to choose other forms of output instead, e.g.
55#
56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58#
59# If $(quiet) is empty, the whole command will be printed.
60# If it is set to "quiet_", only the short version will be printed.
61# If it is set to "silent_", nothing will be printed at all, since
62# the variable $(silent_cmd_cc_o_c) doesn't exist.
63#
64# A simple variant is to prefix commands with $(Q) - that's useful
65# for commands that shall be hidden in non-verbose mode.
66#
67# $(Q)ln $@ :<
68#
69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
71# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
72#
73# To put more focus on warnings, be less verbose as default
74# Use 'make V=1' to see the full commands
75
76ifeq ("$(origin V)", "command line")
77 KBUILD_VERBOSE = $(V)
78endif
79ifndef KBUILD_VERBOSE
80 KBUILD_VERBOSE = 0
81endif
82
83ifeq ($(KBUILD_VERBOSE),1)
84 quiet =
85 Q =
86else
87 quiet=quiet_
88 Q = @
89endif
90
91# If the user is running make -s (silent mode), suppress echoing of
92# commands
93
94ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
95 quiet=silent_
96endif
97
98export quiet Q KBUILD_VERBOSE
99
100# Kbuild will save output files in the current working directory.
101# This does not need to match to the root of the kernel source tree.
102#
103# For example, you can do this:
104#
105# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
106#
107# If you want to save output files in a different location, there are
108# two syntaxes to specify it.
109#
110# 1) O=
111# Use "make O=dir/to/store/output/files/"
112#
113# 2) Set KBUILD_OUTPUT
114# Set the environment variable KBUILD_OUTPUT to point to the output directory.
115# export KBUILD_OUTPUT=dir/to/store/output/files/; make
116#
117# The O= assignment takes precedence over the KBUILD_OUTPUT environment
118# variable.
119
120# Do we want to change the working directory?
121ifeq ("$(origin O)", "command line")
122 KBUILD_OUTPUT := $(O)
123endif
124
125ifneq ($(KBUILD_OUTPUT),)
126# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
127# expand a shell special character '~'. We use a somewhat tedious way here.
128abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
129$(if $(abs_objtree),, \
130 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
131
132# $(realpath ...) resolves symlinks
133abs_objtree := $(realpath $(abs_objtree))
134else
135abs_objtree := $(CURDIR)
136endif # ifneq ($(KBUILD_OUTPUT),)
137
138ifeq ($(abs_objtree),$(CURDIR))
139# Suppress "Entering directory ..." unless we are changing the work directory.
140MAKEFLAGS += --no-print-directory
141else
142need-sub-make := 1
143endif
144
145abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
146
147ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
148$(error source directory cannot contain spaces or colons)
149endif
150
151ifneq ($(abs_srctree),$(abs_objtree))
152# Look for make include files relative to root of kernel src
153#
154# This does not become effective immediately because MAKEFLAGS is re-parsed
155# once after the Makefile is read. We need to invoke sub-make.
156MAKEFLAGS += --include-dir=$(abs_srctree)
157need-sub-make := 1
158endif
159
160this-makefile := $(lastword $(MAKEFILE_LIST))
161
160ifneq ($(filter 3.%,$(MAKE_VERSION)),)
161# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
162# We need to invoke sub-make to avoid implicit rules in the top Makefile.
163need-sub-make := 1
164# Cancel implicit rules for this Makefile.
162ifneq ($(filter 3.%,$(MAKE_VERSION)),)
163# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
164# We need to invoke sub-make to avoid implicit rules in the top Makefile.
165need-sub-make := 1
166# Cancel implicit rules for this Makefile.
165$(lastword $(MAKEFILE_LIST)): ;
167$(this-makefile): ;
166endif
167
168export abs_srctree abs_objtree
169export sub_make_done := 1
170
171ifeq ($(need-sub-make),1)
172
173PHONY += $(MAKECMDGOALS) sub-make
174
168endif
169
170export abs_srctree abs_objtree
171export sub_make_done := 1
172
173ifeq ($(need-sub-make),1)
174
175PHONY += $(MAKECMDGOALS) sub-make
176
175$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
177$(filter-out _all sub-make $(this-makefile), $(MAKECMDGOALS)) _all: sub-make
176 @:
177
178# Invoke a second make in the output directory, passing relevant variables
179sub-make:
180 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
181
182endif # need-sub-make
183endif # sub_make_done
184
185# We process the rest of the Makefile if this is the final invocation of make
186ifeq ($(need-sub-make),)
187
188# Do not print "Entering directory ...",
189# but we want to display it when entering to the output directory
190# so that IDEs/editors are able to understand relative filenames.
191MAKEFLAGS += --no-print-directory
192
193# Call a source code checker (by default, "sparse") as part of the
194# C compilation.
195#
196# Use 'make C=1' to enable checking of only re-compiled files.
197# Use 'make C=2' to enable checking of *all* source files, regardless
198# of whether they are re-compiled or not.
199#
200# See the file "Documentation/dev-tools/sparse.rst" for more details,
201# including where to get the "sparse" utility.
202
203ifeq ("$(origin C)", "command line")
204 KBUILD_CHECKSRC = $(C)
205endif
206ifndef KBUILD_CHECKSRC
207 KBUILD_CHECKSRC = 0
208endif
209
210# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
211# directory of external module to build. Setting M= takes precedence.
212ifeq ("$(origin M)", "command line")
213 KBUILD_EXTMOD := $(M)
214endif
215
216export KBUILD_CHECKSRC KBUILD_EXTMOD
217
218extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
219
220ifeq ($(abs_srctree),$(abs_objtree))
221 # building in the source tree
222 srctree := .
223 building_out_of_srctree :=
224else
225 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
226 # building in a subdirectory of the source tree
227 srctree := ..
228 else
229 srctree := $(abs_srctree)
230 endif
231 building_out_of_srctree := 1
232endif
233
234ifneq ($(KBUILD_ABS_SRCTREE),)
235srctree := $(abs_srctree)
236endif
237
238objtree := .
239VPATH := $(srctree)
240
241export building_out_of_srctree srctree objtree VPATH
242
243# To make sure we do not include .config for any of the *config targets
244# catch them early, and hand them over to scripts/kconfig/Makefile
245# It is allowed to specify more targets when calling make, including
246# mixing *config targets and build targets.
247# For example 'make oldconfig all'.
248# Detect when mixed targets is specified, and make a second invocation
249# of make so .config is not included in this case either (for *config).
250
251version_h := include/generated/uapi/linux/version.h
252old_version_h := include/linux/version.h
253
254clean-targets := %clean mrproper cleandocs
255no-dot-config-targets := $(clean-targets) \
256 cscope gtags TAGS tags help% %docs check% coccicheck \
257 $(version_h) headers headers_% archheaders archscripts \
258 %asm-generic kernelversion %src-pkg dt_binding_check \
259 outputmakefile
260no-sync-config-targets := $(no-dot-config-targets) install %install \
261 kernelrelease
262single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
263
264config-build :=
265mixed-build :=
266need-config := 1
267may-sync-config := 1
268single-build :=
269
270ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
271 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
272 need-config :=
273 endif
274endif
275
276ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
277 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
278 may-sync-config :=
279 endif
280endif
281
282ifneq ($(KBUILD_EXTMOD),)
283 may-sync-config :=
284endif
285
286ifeq ($(KBUILD_EXTMOD),)
287 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
288 config-build := 1
289 ifneq ($(words $(MAKECMDGOALS)),1)
290 mixed-build := 1
291 endif
292 endif
293endif
294
295# We cannot build single targets and the others at the same time
296ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
297 single-build := 1
298 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
299 mixed-build := 1
300 endif
301endif
302
303# For "make -j clean all", "make -j mrproper defconfig all", etc.
304ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
305 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
306 mixed-build := 1
307 endif
308endif
309
310# install and modules_install need also be processed one by one
311ifneq ($(filter install,$(MAKECMDGOALS)),)
312 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
313 mixed-build := 1
314 endif
315endif
316
317ifdef mixed-build
318# ===========================================================================
319# We're called with mixed targets (*config and build targets).
320# Handle them one by one.
321
322PHONY += $(MAKECMDGOALS) __build_one_by_one
323
324$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
325 @:
326
327__build_one_by_one:
328 $(Q)set -e; \
329 for i in $(MAKECMDGOALS); do \
330 $(MAKE) -f $(srctree)/Makefile $$i; \
331 done
332
333else # !mixed-build
334
335include scripts/Kbuild.include
336
337# Read KERNELRELEASE from include/config/kernel.release (if it exists)
338KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
339KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
340export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
341
342include scripts/subarch.include
343
344# Cross compiling and selecting different set of gcc/bin-utils
345# ---------------------------------------------------------------------------
346#
347# When performing cross compilation for other architectures ARCH shall be set
348# to the target architecture. (See arch/* for the possibilities).
349# ARCH can be set during invocation of make:
350# make ARCH=ia64
351# Another way is to have ARCH set in the environment.
352# The default ARCH is the host where make is executed.
353
354# CROSS_COMPILE specify the prefix used for all executables used
355# during compilation. Only gcc and related bin-utils executables
356# are prefixed with $(CROSS_COMPILE).
357# CROSS_COMPILE can be set on the command line
358# make CROSS_COMPILE=ia64-linux-
359# Alternatively CROSS_COMPILE can be set in the environment.
360# Default value for CROSS_COMPILE is not to prefix executables
361# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
362ARCH ?= $(SUBARCH)
363
364# Architecture as present in compile.h
365UTS_MACHINE := $(ARCH)
366SRCARCH := $(ARCH)
367
368# Additional ARCH settings for x86
369ifeq ($(ARCH),i386)
370 SRCARCH := x86
371endif
372ifeq ($(ARCH),x86_64)
373 SRCARCH := x86
374endif
375
376# Additional ARCH settings for sparc
377ifeq ($(ARCH),sparc32)
378 SRCARCH := sparc
379endif
380ifeq ($(ARCH),sparc64)
381 SRCARCH := sparc
382endif
383
384# Additional ARCH settings for sh
385ifeq ($(ARCH),sh64)
386 SRCARCH := sh
387endif
388
389KCONFIG_CONFIG ?= .config
390export KCONFIG_CONFIG
391
392# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
393export KBUILD_DEFCONFIG := defconfig
394
395# SHELL used by kbuild
396CONFIG_SHELL := sh
397
398HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
399HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
400HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
401
402ifneq ($(LLVM),)
403HOSTCC = clang
404HOSTCXX = clang++
405else
406HOSTCC = gcc
407HOSTCXX = g++
408endif
409
410export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
411 -O2 -fomit-frame-pointer -std=gnu89
412export KBUILD_USERLDFLAGS :=
413
414KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
415KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
416KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
417KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
418
419# Make variables (CC, etc...)
420CPP = $(CC) -E
421ifneq ($(LLVM),)
422CC = clang
423LD = ld.lld
424AR = llvm-ar
425NM = llvm-nm
426OBJCOPY = llvm-objcopy
427OBJDUMP = llvm-objdump
428READELF = llvm-readelf
429OBJSIZE = llvm-size
430STRIP = llvm-strip
431else
432CC = $(CROSS_COMPILE)gcc
433LD = $(CROSS_COMPILE)ld
434AR = $(CROSS_COMPILE)ar
435NM = $(CROSS_COMPILE)nm
436OBJCOPY = $(CROSS_COMPILE)objcopy
437OBJDUMP = $(CROSS_COMPILE)objdump
438READELF = $(CROSS_COMPILE)readelf
439OBJSIZE = $(CROSS_COMPILE)size
440STRIP = $(CROSS_COMPILE)strip
441endif
442PAHOLE = pahole
443LEX = flex
444YACC = bison
445AWK = awk
446INSTALLKERNEL := installkernel
447DEPMOD = /sbin/depmod
448PERL = perl
449PYTHON = python
450PYTHON3 = python3
451CHECK = sparse
452BASH = bash
453
454CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
455 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
456NOSTDINC_FLAGS :=
457CFLAGS_MODULE =
458AFLAGS_MODULE =
459LDFLAGS_MODULE =
460CFLAGS_KERNEL =
461AFLAGS_KERNEL =
462LDFLAGS_vmlinux =
463
464# Use USERINCLUDE when you must reference the UAPI directories only.
465USERINCLUDE := \
466 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
467 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
468 -I$(srctree)/include/uapi \
469 -I$(objtree)/include/generated/uapi \
470 -include $(srctree)/include/linux/kconfig.h
471
472# Use LINUXINCLUDE when you must reference the include/ directory.
473# Needed to be compatible with the O= option
474LINUXINCLUDE := \
475 -I$(srctree)/arch/$(SRCARCH)/include \
476 -I$(objtree)/arch/$(SRCARCH)/include/generated \
477 $(if $(building_out_of_srctree),-I$(srctree)/include) \
478 -I$(objtree)/include \
479 $(USERINCLUDE)
480
481KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
482KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
483 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
484 -Werror=implicit-function-declaration -Werror=implicit-int \
485 -Wno-format-security \
486 -std=gnu89
487KBUILD_CPPFLAGS := -D__KERNEL__
488KBUILD_AFLAGS_KERNEL :=
489KBUILD_CFLAGS_KERNEL :=
490KBUILD_AFLAGS_MODULE := -DMODULE
491KBUILD_CFLAGS_MODULE := -DMODULE
492KBUILD_LDFLAGS_MODULE :=
493export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
494KBUILD_LDFLAGS :=
495GCC_PLUGINS_CFLAGS :=
496CLANG_FLAGS :=
497
498export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
499export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
500export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
501export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
502
503export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
504export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
505export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
506export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
507export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
508export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
509
510# Files to ignore in find ... statements
511
512export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
513 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
514 -prune -o
515export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
516 --exclude CVS --exclude .pc --exclude .hg --exclude .git
517
518# ===========================================================================
519# Rules shared between *config targets and build targets
520
521# Basic helpers built in scripts/basic/
522PHONY += scripts_basic
523scripts_basic:
524 $(Q)$(MAKE) $(build)=scripts/basic
525 $(Q)rm -f .tmp_quiet_recordmcount
526
527PHONY += outputmakefile
528# Before starting out-of-tree build, make sure the source tree is clean.
529# outputmakefile generates a Makefile in the output directory, if using a
530# separate output directory. This allows convenient use of make in the
531# output directory.
532# At the same time when output Makefile generated, generate .gitignore to
533# ignore whole output directory
534outputmakefile:
535ifdef building_out_of_srctree
536 $(Q)if [ -f $(srctree)/.config -o \
537 -d $(srctree)/include/config -o \
538 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
539 echo >&2 "***"; \
540 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
541 echo >&2 "*** in $(abs_srctree)";\
542 echo >&2 "***"; \
543 false; \
544 fi
545 $(Q)ln -fsn $(srctree) source
546 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
547 $(Q)test -e .gitignore || \
548 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
549endif
550
551ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
552ifneq ($(CROSS_COMPILE),)
553CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
554GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
555CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
556GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
557endif
558ifneq ($(GCC_TOOLCHAIN),)
559CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
560endif
561ifneq ($(LLVM_IAS),1)
562CLANG_FLAGS += -no-integrated-as
563endif
564CLANG_FLAGS += -Werror=unknown-warning-option
565KBUILD_CFLAGS += $(CLANG_FLAGS)
566KBUILD_AFLAGS += $(CLANG_FLAGS)
567export CLANG_FLAGS
568endif
569
570# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
571# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
572# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
573# and from include/config/auto.conf.cmd to detect the compiler upgrade.
574CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
575
576ifdef config-build
577# ===========================================================================
578# *config targets only - make sure prerequisites are updated, and descend
579# in scripts/kconfig to make the *config target
580
581# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
582# KBUILD_DEFCONFIG may point out an alternative default configuration
583# used for 'make defconfig'
584include arch/$(SRCARCH)/Makefile
585export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
586
587config: outputmakefile scripts_basic FORCE
588 $(Q)$(MAKE) $(build)=scripts/kconfig $@
589
590%config: outputmakefile scripts_basic FORCE
591 $(Q)$(MAKE) $(build)=scripts/kconfig $@
592
593else #!config-build
594# ===========================================================================
595# Build targets only - this includes vmlinux, arch specific targets, clean
596# targets and others. In general all targets except *config targets.
597
598# If building an external module we do not care about the all: rule
599# but instead _all depend on modules
600PHONY += all
601ifeq ($(KBUILD_EXTMOD),)
602_all: all
603else
604_all: modules
605endif
606
607# Decide whether to build built-in, modular, or both.
608# Normally, just do built-in.
609
610KBUILD_MODULES :=
611KBUILD_BUILTIN := 1
612
613# If we have only "make modules", don't compile built-in objects.
614# When we're building modules with modversions, we need to consider
615# the built-in objects during the descend as well, in order to
616# make sure the checksums are up to date before we record them.
617
618ifeq ($(MAKECMDGOALS),modules)
619 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
620endif
621
622# If we have "make <whatever> modules", compile modules
623# in addition to whatever we do anyway.
624# Just "make" or "make all" shall build modules as well
625
626ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
627 KBUILD_MODULES := 1
628endif
629
630ifeq ($(MAKECMDGOALS),)
631 KBUILD_MODULES := 1
632endif
633
634export KBUILD_MODULES KBUILD_BUILTIN
635
636ifdef need-config
637include include/config/auto.conf
638endif
639
640ifeq ($(KBUILD_EXTMOD),)
641# Objects we will link into vmlinux / subdirs we need to visit
642init-y := init/
643drivers-y := drivers/ sound/
644drivers-$(CONFIG_SAMPLES) += samples/
645net-y := net/
646libs-y := lib/
647core-y := usr/
648virt-y := virt/
649endif # KBUILD_EXTMOD
650
651# The all: target is the default when no target is given on the
652# command line.
653# This allow a user to issue only 'make' to build a kernel including modules
654# Defaults to vmlinux, but the arch makefile usually adds further targets
655all: vmlinux
656
657CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
658 $(call cc-option,-fno-tree-loop-im) \
659 $(call cc-disable-warning,maybe-uninitialized,)
660export CFLAGS_GCOV
661
662# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
663ifdef CONFIG_FUNCTION_TRACER
664 CC_FLAGS_FTRACE := -pg
665endif
666
667RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
668RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
669RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
670RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
671RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
672RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
673export RETPOLINE_CFLAGS
674export RETPOLINE_VDSO_CFLAGS
675
676include arch/$(SRCARCH)/Makefile
677
678ifdef need-config
679ifdef may-sync-config
680# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
681# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
682# because some architectures define CROSS_COMPILE there.
683include include/config/auto.conf.cmd
684
685$(KCONFIG_CONFIG):
686 @echo >&2 '***'
687 @echo >&2 '*** Configuration file "$@" not found!'
688 @echo >&2 '***'
689 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
690 @echo >&2 '*** "make menuconfig" or "make xconfig").'
691 @echo >&2 '***'
692 @/bin/false
693
694# The actual configuration files used during the build are stored in
695# include/generated/ and include/config/. Update them if .config is newer than
696# include/config/auto.conf (which mirrors .config).
697#
698# This exploits the 'multi-target pattern rule' trick.
699# The syncconfig should be executed only once to make all the targets.
700# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
701%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
702 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
703else # !may-sync-config
704# External modules and some install targets need include/generated/autoconf.h
705# and include/config/auto.conf but do not care if they are up-to-date.
706# Use auto.conf to trigger the test
707PHONY += include/config/auto.conf
708
709include/config/auto.conf:
710 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
711 echo >&2; \
712 echo >&2 " ERROR: Kernel configuration is invalid."; \
713 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
714 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
715 echo >&2 ; \
716 /bin/false)
717
718endif # may-sync-config
719endif # need-config
720
721KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
722KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
723KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
724KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
725KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
726
727ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
728KBUILD_CFLAGS += -O2
729else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
730KBUILD_CFLAGS += -O3
731else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
732KBUILD_CFLAGS += -Os
733endif
734
735# Tell gcc to never replace conditional load with a non-conditional one
736KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
737KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
738
739include scripts/Makefile.kcov
740include scripts/Makefile.gcc-plugins
741
742ifdef CONFIG_READABLE_ASM
743# Disable optimizations that make assembler listings hard to read.
744# reorder blocks reorders the control in the function
745# ipa clone creates specialized cloned functions
746# partial inlining inlines only parts of functions
747KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
748 $(call cc-option,-fno-ipa-cp-clone,) \
749 $(call cc-option,-fno-partial-inlining)
750endif
751
752ifneq ($(CONFIG_FRAME_WARN),0)
753KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
754endif
755
756stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
757stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
758stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
759
760KBUILD_CFLAGS += $(stackp-flags-y)
761
762ifdef CONFIG_CC_IS_CLANG
763KBUILD_CPPFLAGS += -Qunused-arguments
764KBUILD_CFLAGS += -Wno-format-invalid-specifier
765KBUILD_CFLAGS += -Wno-gnu
766# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
767# source of a reference will be _MergedGlobals and not on of the whitelisted names.
768# See modpost pattern 2
769KBUILD_CFLAGS += -mno-global-merge
770else
771
772# These warnings generated too much noise in a regular build.
773# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
774KBUILD_CFLAGS += -Wno-unused-but-set-variable
775
776# Warn about unmarked fall-throughs in switch statement.
777# Disabled for clang while comment to attribute conversion happens and
778# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
779KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
780endif
781
782KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
783ifdef CONFIG_FRAME_POINTER
784KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
785else
786# Some targets (ARM with Thumb2, for example), can't be built with frame
787# pointers. For those, we don't have FUNCTION_TRACER automatically
788# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
789# incompatible with -fomit-frame-pointer with current GCC, so we don't use
790# -fomit-frame-pointer with FUNCTION_TRACER.
791ifndef CONFIG_FUNCTION_TRACER
792KBUILD_CFLAGS += -fomit-frame-pointer
793endif
794endif
795
796# Initialize all stack variables with a pattern, if desired.
797ifdef CONFIG_INIT_STACK_ALL
798KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
799endif
800
801DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
802
803ifdef CONFIG_DEBUG_INFO
804ifdef CONFIG_DEBUG_INFO_SPLIT
805DEBUG_CFLAGS += -gsplit-dwarf
806else
807DEBUG_CFLAGS += -g
808endif
809KBUILD_AFLAGS += -Wa,-gdwarf-2
810endif
811ifdef CONFIG_DEBUG_INFO_DWARF4
812DEBUG_CFLAGS += -gdwarf-4
813endif
814
815ifdef CONFIG_DEBUG_INFO_REDUCED
816DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
817 $(call cc-option,-fno-var-tracking)
818endif
819
820KBUILD_CFLAGS += $(DEBUG_CFLAGS)
821export DEBUG_CFLAGS
822
823ifdef CONFIG_FUNCTION_TRACER
824ifdef CONFIG_FTRACE_MCOUNT_RECORD
825 # gcc 5 supports generating the mcount tables directly
826 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
827 CC_FLAGS_FTRACE += -mrecord-mcount
828 export CC_USING_RECORD_MCOUNT := 1
829 endif
830 ifdef CONFIG_HAVE_NOP_MCOUNT
831 ifeq ($(call cc-option-yn, -mnop-mcount),y)
832 CC_FLAGS_FTRACE += -mnop-mcount
833 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
834 endif
835 endif
836endif
837ifdef CONFIG_HAVE_FENTRY
838 ifeq ($(call cc-option-yn, -mfentry),y)
839 CC_FLAGS_FTRACE += -mfentry
840 CC_FLAGS_USING += -DCC_USING_FENTRY
841 endif
842endif
843export CC_FLAGS_FTRACE
844KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
845KBUILD_AFLAGS += $(CC_FLAGS_USING)
846ifdef CONFIG_DYNAMIC_FTRACE
847 ifdef CONFIG_HAVE_C_RECORDMCOUNT
848 BUILD_C_RECORDMCOUNT := y
849 export BUILD_C_RECORDMCOUNT
850 endif
851endif
852endif
853
854# We trigger additional mismatches with less inlining
855ifdef CONFIG_DEBUG_SECTION_MISMATCH
856KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
857endif
858
859ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
860KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
861LDFLAGS_vmlinux += --gc-sections
862endif
863
864ifdef CONFIG_LIVEPATCH
865KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
866endif
867
868# arch Makefile may override CC so keep this after arch Makefile is included
869NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
870
871# warn about C99 declaration after statement
872KBUILD_CFLAGS += -Wdeclaration-after-statement
873
874# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
875KBUILD_CFLAGS += -Wvla
876
877# disable pointer signed / unsigned warnings in gcc 4.0
878KBUILD_CFLAGS += -Wno-pointer-sign
879
880# disable stringop warnings in gcc 8+
881KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
882
883# We'll want to enable this eventually, but it's not going away for 5.7 at least
884KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
885KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
886KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
887
888# Another good warning that we'll want to enable eventually
889KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
890
891# Enabled with W=2, disabled by default as noisy
892KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
893
894# disable invalid "can't wrap" optimizations for signed / pointers
895KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
896
897# clang sets -fmerge-all-constants by default as optimization, but this
898# is non-conforming behavior for C and in fact breaks the kernel, so we
899# need to disable it here generally.
900KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
901
902# for gcc -fno-merge-all-constants disables everything, but it is fine
903# to have actual conforming behavior enabled.
904KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
905
906# Make sure -fstack-check isn't enabled (like gentoo apparently did)
907KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
908
909# conserve stack if available
910KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
911
912# Prohibit date/time macros, which would make the build non-deterministic
913KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
914
915# enforce correct pointer usage
916KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
917
918# Require designated initializers for all marked structures
919KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
920
921# change __FILE__ to the relative path from the srctree
922KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
923
924# ensure -fcf-protection is disabled when using retpoline as it is
925# incompatible with -mindirect-branch=thunk-extern
926ifdef CONFIG_RETPOLINE
927KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
928endif
929
930include scripts/Makefile.kasan
931include scripts/Makefile.extrawarn
932include scripts/Makefile.ubsan
933
934# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
935KBUILD_CPPFLAGS += $(KCPPFLAGS)
936KBUILD_AFLAGS += $(KAFLAGS)
937KBUILD_CFLAGS += $(KCFLAGS)
938
939KBUILD_LDFLAGS_MODULE += --build-id
940LDFLAGS_vmlinux += --build-id
941
942ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
943LDFLAGS_vmlinux += $(call ld-option, -X,)
944endif
945
946ifeq ($(CONFIG_RELR),y)
947LDFLAGS_vmlinux += --pack-dyn-relocs=relr
948endif
949
950# Align the bit size of userspace programs with the kernel
951KBUILD_USERCFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
952KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
953
954# make the checker run with the right architecture
955CHECKFLAGS += --arch=$(ARCH)
956
957# insure the checker run with the right endianness
958CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
959
960# the checker needs the correct machine size
961CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
962
963# Default kernel image to build when no specific target is given.
964# KBUILD_IMAGE may be overruled on the command line or
965# set in the environment
966# Also any assignments in arch/$(ARCH)/Makefile take precedence over
967# this default value
968export KBUILD_IMAGE ?= vmlinux
969
970#
971# INSTALL_PATH specifies where to place the updated kernel and system map
972# images. Default is /boot, but you can set it to other values
973export INSTALL_PATH ?= /boot
974
975#
976# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
977# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
978# an argument if needed. Otherwise it defaults to the kernel install path
979#
980export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
981
982#
983# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
984# relocations required by build roots. This is not defined in the
985# makefile but the argument can be passed to make if needed.
986#
987
988MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
989export MODLIB
990
991#
992# INSTALL_MOD_STRIP, if defined, will cause modules to be
993# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
994# the default option --strip-debug will be used. Otherwise,
995# INSTALL_MOD_STRIP value will be used as the options to the strip command.
996
997ifdef INSTALL_MOD_STRIP
998ifeq ($(INSTALL_MOD_STRIP),1)
999mod_strip_cmd = $(STRIP) --strip-debug
1000else
1001mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1002endif # INSTALL_MOD_STRIP=1
1003else
1004mod_strip_cmd = true
1005endif # INSTALL_MOD_STRIP
1006export mod_strip_cmd
1007
1008# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1009# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1010# or CONFIG_MODULE_COMPRESS_XZ.
1011
1012mod_compress_cmd = true
1013ifdef CONFIG_MODULE_COMPRESS
1014 ifdef CONFIG_MODULE_COMPRESS_GZIP
1015 mod_compress_cmd = gzip -n -f
1016 endif # CONFIG_MODULE_COMPRESS_GZIP
1017 ifdef CONFIG_MODULE_COMPRESS_XZ
1018 mod_compress_cmd = xz -f
1019 endif # CONFIG_MODULE_COMPRESS_XZ
1020endif # CONFIG_MODULE_COMPRESS
1021export mod_compress_cmd
1022
1023ifdef CONFIG_MODULE_SIG_ALL
1024$(eval $(call config_filename,MODULE_SIG_KEY))
1025
1026mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1027else
1028mod_sign_cmd = true
1029endif
1030export mod_sign_cmd
1031
1032HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1033
1034ifdef CONFIG_STACK_VALIDATION
1035 has_libelf := $(call try-run,\
1036 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1037 ifeq ($(has_libelf),1)
1038 objtool_target := tools/objtool FORCE
1039 else
1040 SKIP_STACK_VALIDATION := 1
1041 export SKIP_STACK_VALIDATION
1042 endif
1043endif
1044
1045PHONY += prepare0
1046
1047export MODORDER := $(extmod-prefix)modules.order
1048export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1049
1050ifeq ($(KBUILD_EXTMOD),)
1051core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1052
1053vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1054 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1055 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1056
1057vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1058 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1059 $(drivers-) $(net-) $(libs-) $(virt-))))
1060
1061build-dirs := $(vmlinux-dirs)
1062clean-dirs := $(vmlinux-alldirs)
1063
1064init-y := $(patsubst %/, %/built-in.a, $(init-y))
1065core-y := $(patsubst %/, %/built-in.a, $(core-y))
1066drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1067net-y := $(patsubst %/, %/built-in.a, $(net-y))
1068libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
1069ifdef CONFIG_MODULES
1070libs-y1 := $(filter-out %/, $(libs-y))
1071libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1072else
1073libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1074endif
1075virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1076
1077# Externally visible symbols (used by link-vmlinux.sh)
1078export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1079 $(drivers-y) $(net-y) $(virt-y)
1080export KBUILD_VMLINUX_LIBS := $(libs-y1)
1081export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1082export LDFLAGS_vmlinux
1083# used by scripts/Makefile.package
1084export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1085
1086vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1087
1088# Recurse until adjust_autoksyms.sh is satisfied
1089PHONY += autoksyms_recursive
1090ifdef CONFIG_TRIM_UNUSED_KSYMS
1091autoksyms_recursive: descend modules.order
1092 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1093 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1094endif
1095
1096# For the kernel to actually contain only the needed exported symbols,
1097# we have to build modules as well to determine what those symbols are.
1098# (this can be evaluated only once include/config/auto.conf has been included)
1099ifdef CONFIG_TRIM_UNUSED_KSYMS
1100 KBUILD_MODULES := 1
1101endif
1102
1103autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1104
1105quiet_cmd_autoksyms_h = GEN $@
1106 cmd_autoksyms_h = mkdir -p $(dir $@); \
1107 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1108
1109$(autoksyms_h):
1110 $(call cmd,autoksyms_h)
1111
1112ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1113
1114# Final link of vmlinux with optional arch pass after final link
1115cmd_link-vmlinux = \
1116 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1117 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1118
1119vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1120 +$(call if_changed,link-vmlinux)
1121
1122targets := vmlinux
1123
1124# The actual objects are generated when descending,
1125# make sure no implicit rule kicks in
1126$(sort $(vmlinux-deps)): descend ;
1127
1128filechk_kernel.release = \
1129 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1130
1131# Store (new) KERNELRELEASE string in include/config/kernel.release
1132include/config/kernel.release: FORCE
1133 $(call filechk,kernel.release)
1134
1135# Additional helpers built in scripts/
1136# Carefully list dependencies so we do not try to build scripts twice
1137# in parallel
1138PHONY += scripts
1139scripts: scripts_basic scripts_dtc
1140 $(Q)$(MAKE) $(build)=$(@)
1141
1142# Things we need to do before we recursively start building the kernel
1143# or the modules are listed in "prepare".
1144# A multi level approach is used. prepareN is processed before prepareN-1.
1145# archprepare is used in arch Makefiles and when processed asm symlink,
1146# version.h and scripts_basic is processed / created.
1147
1148PHONY += prepare archprepare
1149
1150archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1151 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1152 include/generated/autoconf.h
1153
1154prepare0: archprepare
1155 $(Q)$(MAKE) $(build)=scripts/mod
1156 $(Q)$(MAKE) $(build)=.
1157
1158# All the preparing..
1159prepare: prepare0 prepare-objtool
1160
1161# Support for using generic headers in asm-generic
1162asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1163
1164PHONY += asm-generic uapi-asm-generic
1165asm-generic: uapi-asm-generic
1166 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1167 generic=include/asm-generic
1168uapi-asm-generic:
1169 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1170 generic=include/uapi/asm-generic
1171
1172PHONY += prepare-objtool
1173prepare-objtool: $(objtool_target)
1174ifeq ($(SKIP_STACK_VALIDATION),1)
1175ifdef CONFIG_UNWINDER_ORC
1176 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1177 @false
1178else
1179 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1180endif
1181endif
1182
1183# Generate some files
1184# ---------------------------------------------------------------------------
1185
1186# KERNELRELEASE can change from a few different places, meaning version.h
1187# needs to be updated, so this check is forced on all builds
1188
1189uts_len := 64
1190define filechk_utsrelease.h
1191 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1192 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1193 exit 1; \
1194 fi; \
1195 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1196endef
1197
1198define filechk_version.h
1199 echo \#define LINUX_VERSION_CODE $(shell \
1200 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1201 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1202endef
1203
1204$(version_h): FORCE
1205 $(call filechk,version.h)
1206 $(Q)rm -f $(old_version_h)
1207
1208include/generated/utsrelease.h: include/config/kernel.release FORCE
1209 $(call filechk,utsrelease.h)
1210
1211PHONY += headerdep
1212headerdep:
1213 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1214 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1215
1216# ---------------------------------------------------------------------------
1217# Kernel headers
1218
1219#Default location for installed headers
1220export INSTALL_HDR_PATH = $(objtree)/usr
1221
1222quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1223 cmd_headers_install = \
1224 mkdir -p $(INSTALL_HDR_PATH); \
1225 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1226 usr/include $(INSTALL_HDR_PATH)
1227
1228PHONY += headers_install
1229headers_install: headers
1230 $(call cmd,headers_install)
1231
1232PHONY += archheaders archscripts
1233
1234hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1235
1236PHONY += headers
1237headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1238 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1239 $(error Headers not exportable for the $(SRCARCH) architecture))
1240 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1241 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1242
1243# Deprecated. It is no-op now.
1244PHONY += headers_check
1245headers_check:
1246 @:
1247
1248ifdef CONFIG_HEADERS_INSTALL
1249prepare: headers
1250endif
1251
1252PHONY += scripts_unifdef
1253scripts_unifdef: scripts_basic
1254 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1255
1256# ---------------------------------------------------------------------------
1257# Kernel selftest
1258
1259PHONY += kselftest
1260kselftest:
1261 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1262
1263kselftest-%: FORCE
1264 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1265
1266PHONY += kselftest-merge
1267kselftest-merge:
1268 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1269 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1270 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1271 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1272
1273# ---------------------------------------------------------------------------
1274# Devicetree files
1275
1276ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1277dtstree := arch/$(SRCARCH)/boot/dts
1278endif
1279
1280ifneq ($(dtstree),)
1281
1282%.dtb: include/config/kernel.release scripts_dtc
1283 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1284
1285PHONY += dtbs dtbs_install dtbs_check
1286dtbs: include/config/kernel.release scripts_dtc
1287 $(Q)$(MAKE) $(build)=$(dtstree)
1288
1289ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1290export CHECK_DTBS=y
1291dtbs: dt_binding_check
1292endif
1293
1294dtbs_check: dtbs
1295
1296dtbs_install:
1297 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1298
1299ifdef CONFIG_OF_EARLY_FLATTREE
1300all: dtbs
1301endif
1302
1303endif
1304
1305PHONY += scripts_dtc
1306scripts_dtc: scripts_basic
1307 $(Q)$(MAKE) $(build)=scripts/dtc
1308
1309ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1310export CHECK_DT_BINDING=y
1311endif
1312
1313PHONY += dt_binding_check
1314dt_binding_check: scripts_dtc
1315 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1316
1317# ---------------------------------------------------------------------------
1318# Modules
1319
1320ifdef CONFIG_MODULES
1321
1322# By default, build modules as well
1323
1324all: modules
1325
1326# Build modules
1327#
1328# A module can be listed more than once in obj-m resulting in
1329# duplicate lines in modules.order files. Those are removed
1330# using awk while concatenating to the final file.
1331
1332PHONY += modules
1333modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1334 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1335 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1336
1337modules.order: descend
1338 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1339
1340# Target to prepare building external modules
1341PHONY += modules_prepare
1342modules_prepare: prepare
1343
1344# Target to install modules
1345PHONY += modules_install
1346modules_install: _modinst_ _modinst_post
1347
1348PHONY += _modinst_
1349_modinst_:
1350 @rm -rf $(MODLIB)/kernel
1351 @rm -f $(MODLIB)/source
1352 @mkdir -p $(MODLIB)/kernel
1353 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1354 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1355 rm -f $(MODLIB)/build ; \
1356 ln -s $(CURDIR) $(MODLIB)/build ; \
1357 fi
1358 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1359 @cp -f modules.builtin $(MODLIB)/
1360 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1361 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1362
1363# This depmod is only for convenience to give the initial
1364# boot a modules.dep even before / is mounted read-write. However the
1365# boot script depmod is the master version.
1366PHONY += _modinst_post
1367_modinst_post: _modinst_
1368 $(call cmd,depmod)
1369
1370ifeq ($(CONFIG_MODULE_SIG), y)
1371PHONY += modules_sign
1372modules_sign:
1373 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1374endif
1375
1376else # CONFIG_MODULES
1377
1378# Modules not configured
1379# ---------------------------------------------------------------------------
1380
1381PHONY += modules modules_install
1382modules modules_install:
1383 @echo >&2
1384 @echo >&2 "The present kernel configuration has modules disabled."
1385 @echo >&2 "Type 'make config' and enable loadable module support."
1386 @echo >&2 "Then build a kernel with module support enabled."
1387 @echo >&2
1388 @exit 1
1389
1390endif # CONFIG_MODULES
1391
1392###
1393# Cleaning is done on three levels.
1394# make clean Delete most generated files
1395# Leave enough to build external modules
1396# make mrproper Delete the current configuration, and all generated files
1397# make distclean Remove editor backup files, patch leftover files and the like
1398
1399# Directories & files removed with 'make clean'
1400CLEAN_FILES += include/ksym \
1401 modules.builtin modules.builtin.modinfo modules.nsdeps
1402
1403# Directories & files removed with 'make mrproper'
1404MRPROPER_FILES += include/config include/generated \
1405 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1406 debian snap tar-install \
1407 .config .config.old .version \
1408 Module.symvers \
1409 signing_key.pem signing_key.priv signing_key.x509 \
1410 x509.genkey extra_certificates signing_key.x509.keyid \
1411 signing_key.x509.signer vmlinux-gdb.py \
1412 *.spec
1413
1414# Directories & files removed with 'make distclean'
1415DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1416
1417# clean - Delete most, but leave enough to build external modules
1418#
1419clean: rm-files := $(CLEAN_FILES)
1420
1421PHONY += archclean vmlinuxclean
1422
1423vmlinuxclean:
1424 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1425 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1426
1427clean: archclean vmlinuxclean
1428
1429# mrproper - Delete all generated files, including .config
1430#
1431mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1432mrproper-dirs := $(addprefix _mrproper_,scripts)
1433
1434PHONY += $(mrproper-dirs) mrproper
1435$(mrproper-dirs):
1436 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1437
1438mrproper: clean $(mrproper-dirs)
1439 $(call cmd,rmfiles)
1440
1441# distclean
1442#
1443distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1444
1445PHONY += distclean
1446
1447distclean: mrproper
1448 $(call cmd,rmfiles)
1449 @find $(srctree) $(RCS_FIND_IGNORE) \
1450 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1451 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1452 -o -name 'core' \) \
1453 -type f -print | xargs rm -f
1454
1455
1456# Packaging of the kernel to various formats
1457# ---------------------------------------------------------------------------
1458
1459%src-pkg: FORCE
1460 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1461%pkg: include/config/kernel.release FORCE
1462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1463
1464# Brief documentation of the typical targets used
1465# ---------------------------------------------------------------------------
1466
1467boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1468boards := $(sort $(notdir $(boards)))
1469board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1470board-dirs := $(sort $(notdir $(board-dirs:/=)))
1471
1472PHONY += help
1473help:
1474 @echo 'Cleaning targets:'
1475 @echo ' clean - Remove most generated files but keep the config and'
1476 @echo ' enough build support to build external modules'
1477 @echo ' mrproper - Remove all generated files + config + various backup files'
1478 @echo ' distclean - mrproper + remove editor backup and patch files'
1479 @echo ''
1480 @echo 'Configuration targets:'
1481 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1482 @echo ''
1483 @echo 'Other generic targets:'
1484 @echo ' all - Build all targets marked with [*]'
1485 @echo '* vmlinux - Build the bare kernel'
1486 @echo '* modules - Build all modules'
1487 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1488 @echo ' dir/ - Build all files in dir and below'
1489 @echo ' dir/file.[ois] - Build specified target only'
1490 @echo ' dir/file.ll - Build the LLVM assembly file'
1491 @echo ' (requires compiler support for LLVM assembly generation)'
1492 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1493 @echo ' (requires a recent binutils and recent build (System.map))'
1494 @echo ' dir/file.ko - Build module including final link'
1495 @echo ' modules_prepare - Set up for building external modules'
1496 @echo ' tags/TAGS - Generate tags file for editors'
1497 @echo ' cscope - Generate cscope index'
1498 @echo ' gtags - Generate GNU GLOBAL index'
1499 @echo ' kernelrelease - Output the release version string (use with make -s)'
1500 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1501 @echo ' image_name - Output the image name (use with make -s)'
1502 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1503 echo ' (default: $(INSTALL_HDR_PATH))'; \
1504 echo ''
1505 @echo 'Static analysers:'
1506 @echo ' checkstack - Generate a list of stack hogs'
1507 @echo ' namespacecheck - Name space analysis on compiled kernel'
1508 @echo ' versioncheck - Sanity check on version.h usage'
1509 @echo ' includecheck - Check for duplicate included header files'
1510 @echo ' export_report - List the usages of all exported symbols'
1511 @echo ' headerdep - Detect inclusion cycles in headers'
1512 @echo ' coccicheck - Check with Coccinelle'
1513 @echo ''
1514 @echo 'Tools:'
1515 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1516 @echo ''
1517 @echo 'Kernel selftest:'
1518 @echo ' kselftest - Build and run kernel selftest'
1519 @echo ' Build, install, and boot kernel before'
1520 @echo ' running kselftest on it'
1521 @echo ' Run as root for full coverage'
1522 @echo ' kselftest-all - Build kernel selftest'
1523 @echo ' kselftest-install - Build and install kernel selftest'
1524 @echo ' kselftest-clean - Remove all generated kselftest files'
1525 @echo ' kselftest-merge - Merge all the config dependencies of'
1526 @echo ' kselftest to existing .config.'
1527 @echo ''
1528 @$(if $(dtstree), \
1529 echo 'Devicetree:'; \
1530 echo '* dtbs - Build device tree blobs for enabled boards'; \
1531 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1532 echo ' dt_binding_check - Validate device tree binding documents'; \
1533 echo ' dtbs_check - Validate device tree source files';\
1534 echo '')
1535
1536 @echo 'Userspace tools targets:'
1537 @echo ' use "make tools/help"'
1538 @echo ' or "cd tools; make help"'
1539 @echo ''
1540 @echo 'Kernel packaging:'
1541 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1542 @echo ''
1543 @echo 'Documentation targets:'
1544 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1545 @echo ''
1546 @echo 'Architecture specific targets ($(SRCARCH)):'
1547 @$(if $(archhelp),$(archhelp),\
1548 echo ' No architecture specific help defined for $(SRCARCH)')
1549 @echo ''
1550 @$(if $(boards), \
1551 $(foreach b, $(boards), \
1552 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1553 echo '')
1554 @$(if $(board-dirs), \
1555 $(foreach b, $(board-dirs), \
1556 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1557 printf " %-16s - Show all of the above\\n" help-boards; \
1558 echo '')
1559
1560 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1561 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1562 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1563 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1564 @echo ' (sparse by default)'
1565 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1566 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1567 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1568 @echo ' 1: warnings which may be relevant and do not occur too often'
1569 @echo ' 2: warnings which occur quite often but may still be relevant'
1570 @echo ' 3: more obscure warnings, can most likely be ignored'
1571 @echo ' Multiple levels can be combined with W=12 or W=123'
1572 @echo ''
1573 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1574 @echo 'For further info see the ./README file'
1575
1576
1577help-board-dirs := $(addprefix help-,$(board-dirs))
1578
1579help-boards: $(help-board-dirs)
1580
1581boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1582
1583$(help-board-dirs): help-%:
1584 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1585 @$(if $(boards-per-dir), \
1586 $(foreach b, $(boards-per-dir), \
1587 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1588 echo '')
1589
1590
1591# Documentation targets
1592# ---------------------------------------------------------------------------
1593DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1594 linkcheckdocs dochelp refcheckdocs
1595PHONY += $(DOC_TARGETS)
1596$(DOC_TARGETS):
1597 $(Q)$(MAKE) $(build)=Documentation $@
1598
1599# Misc
1600# ---------------------------------------------------------------------------
1601
1602PHONY += scripts_gdb
1603scripts_gdb: prepare0
1604 $(Q)$(MAKE) $(build)=scripts/gdb
1605 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1606
1607ifdef CONFIG_GDB_SCRIPTS
1608all: scripts_gdb
1609endif
1610
1611else # KBUILD_EXTMOD
1612
1613###
1614# External module support.
1615# When building external modules the kernel used as basis is considered
1616# read-only, and no consistency checks are made and the make
1617# system is not used on the basis kernel. If updates are required
1618# in the basis kernel ordinary make commands (without M=...) must
1619# be used.
1620#
1621# The following are the only valid targets when building external
1622# modules.
1623# make M=dir clean Delete all automatically generated files
1624# make M=dir modules Make all modules in specified dir
1625# make M=dir Same as 'make M=dir modules'
1626# make M=dir modules_install
1627# Install the modules built in the module directory
1628# Assumes install directory is already created
1629
1630# We are always building modules
1631KBUILD_MODULES := 1
1632
1633PHONY += $(objtree)/Module.symvers
1634$(objtree)/Module.symvers:
1635 @test -e $(objtree)/Module.symvers || ( \
1636 echo; \
1637 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1638 echo " is missing; modules will have no dependencies and modversions."; \
1639 echo )
1640
1641build-dirs := $(KBUILD_EXTMOD)
1642PHONY += modules
1643modules: descend $(objtree)/Module.symvers
1644 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1645
1646PHONY += modules_install
1647modules_install: _emodinst_ _emodinst_post
1648
1649install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1650PHONY += _emodinst_
1651_emodinst_:
1652 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1653 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1654
1655PHONY += _emodinst_post
1656_emodinst_post: _emodinst_
1657 $(call cmd,depmod)
1658
1659clean-dirs := $(KBUILD_EXTMOD)
1660clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1661
1662PHONY += help
1663help:
1664 @echo ' Building external modules.'
1665 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1666 @echo ''
1667 @echo ' modules - default target, build the module(s)'
1668 @echo ' modules_install - install the module'
1669 @echo ' clean - remove generated files in module directory only'
1670 @echo ''
1671
1672PHONY += prepare
1673endif # KBUILD_EXTMOD
1674
1675# Single targets
1676# ---------------------------------------------------------------------------
1677# To build individual files in subdirectories, you can do like this:
1678#
1679# make foo/bar/baz.s
1680#
1681# The supported suffixes for single-target are listed in 'single-targets'
1682#
1683# To build only under specific subdirectories, you can do like this:
1684#
1685# make foo/bar/baz/
1686
1687ifdef single-build
1688
1689# .ko is special because modpost is needed
1690single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1691single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1692
1693$(single-ko): single_modpost
1694 @:
1695$(single-no-ko): descend
1696 @:
1697
1698ifeq ($(KBUILD_EXTMOD),)
1699# For the single build of in-tree modules, use a temporary file to avoid
1700# the situation of modules_install installing an invalid modules.order.
1701MODORDER := .modules.tmp
1702endif
1703
1704PHONY += single_modpost
1705single_modpost: $(single-no-ko)
1706 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1707 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1708
1709KBUILD_MODULES := 1
1710
1711export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1712
1713# trim unrelated directories
1714build-dirs := $(foreach d, $(build-dirs), \
1715 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1716
1717endif
1718
1719# Handle descending into subdirectories listed in $(build-dirs)
1720# Preset locale variables to speed up the build process. Limit locale
1721# tweaks to this spot to avoid wrong language settings when running
1722# make menuconfig etc.
1723# Error messages still appears in the original language
1724PHONY += descend $(build-dirs)
1725descend: $(build-dirs)
1726$(build-dirs): prepare
1727 $(Q)$(MAKE) $(build)=$@ \
1728 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1729 need-builtin=1 need-modorder=1
1730
1731clean-dirs := $(addprefix _clean_, $(clean-dirs))
1732PHONY += $(clean-dirs) clean
1733$(clean-dirs):
1734 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1735
1736clean: $(clean-dirs)
1737 $(call cmd,rmfiles)
1738 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1739 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1740 -o -name '*.ko.*' \
1741 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1742 -o -name '*.dwo' -o -name '*.lst' \
1743 -o -name '*.su' -o -name '*.mod' \
1744 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1745 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1746 -o -name '*.asn1.[ch]' \
1747 -o -name '*.symtypes' -o -name 'modules.order' \
1748 -o -name '.tmp_*.o.*' \
1749 -o -name '*.c.[012]*.*' \
1750 -o -name '*.ll' \
1751 -o -name '*.gcno' \) -type f -print | xargs rm -f
1752
1753# Generate tags for editors
1754# ---------------------------------------------------------------------------
1755quiet_cmd_tags = GEN $@
1756 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1757
1758tags TAGS cscope gtags: FORCE
1759 $(call cmd,tags)
1760
1761# Script to generate missing namespace dependencies
1762# ---------------------------------------------------------------------------
1763
1764PHONY += nsdeps
1765nsdeps: export KBUILD_NSDEPS=1
1766nsdeps: modules
1767 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1768
1769# Scripts to check various things for consistency
1770# ---------------------------------------------------------------------------
1771
1772PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1773
1774includecheck:
1775 find $(srctree)/* $(RCS_FIND_IGNORE) \
1776 -name '*.[hcS]' -type f -print | sort \
1777 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1778
1779versioncheck:
1780 find $(srctree)/* $(RCS_FIND_IGNORE) \
1781 -name '*.[hcS]' -type f -print | sort \
1782 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1783
1784coccicheck:
1785 $(Q)$(BASH) $(srctree)/scripts/$@
1786
1787namespacecheck:
1788 $(PERL) $(srctree)/scripts/namespace.pl
1789
1790export_report:
1791 $(PERL) $(srctree)/scripts/export_report.pl
1792
1793PHONY += checkstack kernelrelease kernelversion image_name
1794
1795# UML needs a little special treatment here. It wants to use the host
1796# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1797# else wants $(ARCH), including people doing cross-builds, which means
1798# that $(SUBARCH) doesn't work here.
1799ifeq ($(ARCH), um)
1800CHECKSTACK_ARCH := $(SUBARCH)
1801else
1802CHECKSTACK_ARCH := $(ARCH)
1803endif
1804checkstack:
1805 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1806 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1807
1808kernelrelease:
1809 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1810
1811kernelversion:
1812 @echo $(KERNELVERSION)
1813
1814image_name:
1815 @echo $(KBUILD_IMAGE)
1816
1817# Clear a bunch of variables before executing the submake
1818
1819ifeq ($(quiet),silent_)
1820tools_silent=s
1821endif
1822
1823tools/: FORCE
1824 $(Q)mkdir -p $(objtree)/tools
1825 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1826
1827tools/%: FORCE
1828 $(Q)mkdir -p $(objtree)/tools
1829 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1830
1831quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1832 cmd_rmfiles = rm -rf $(rm-files)
1833
1834# Run depmod only if we have System.map and depmod is executable
1835quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1836 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1837 $(KERNELRELEASE)
1838
1839# read saved command lines for existing targets
1840existing-targets := $(wildcard $(sort $(targets)))
1841
1842-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1843
1844endif # config-build
1845endif # mixed-build
1846endif # need-sub-make
1847
1848PHONY += FORCE
1849FORCE:
1850
1851# Declare the contents of the PHONY variable as phony. We keep that
1852# information in a variable so we can use it in if_changed and friends.
1853.PHONY: $(PHONY)
178 @:
179
180# Invoke a second make in the output directory, passing relevant variables
181sub-make:
182 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
183
184endif # need-sub-make
185endif # sub_make_done
186
187# We process the rest of the Makefile if this is the final invocation of make
188ifeq ($(need-sub-make),)
189
190# Do not print "Entering directory ...",
191# but we want to display it when entering to the output directory
192# so that IDEs/editors are able to understand relative filenames.
193MAKEFLAGS += --no-print-directory
194
195# Call a source code checker (by default, "sparse") as part of the
196# C compilation.
197#
198# Use 'make C=1' to enable checking of only re-compiled files.
199# Use 'make C=2' to enable checking of *all* source files, regardless
200# of whether they are re-compiled or not.
201#
202# See the file "Documentation/dev-tools/sparse.rst" for more details,
203# including where to get the "sparse" utility.
204
205ifeq ("$(origin C)", "command line")
206 KBUILD_CHECKSRC = $(C)
207endif
208ifndef KBUILD_CHECKSRC
209 KBUILD_CHECKSRC = 0
210endif
211
212# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
213# directory of external module to build. Setting M= takes precedence.
214ifeq ("$(origin M)", "command line")
215 KBUILD_EXTMOD := $(M)
216endif
217
218export KBUILD_CHECKSRC KBUILD_EXTMOD
219
220extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
221
222ifeq ($(abs_srctree),$(abs_objtree))
223 # building in the source tree
224 srctree := .
225 building_out_of_srctree :=
226else
227 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
228 # building in a subdirectory of the source tree
229 srctree := ..
230 else
231 srctree := $(abs_srctree)
232 endif
233 building_out_of_srctree := 1
234endif
235
236ifneq ($(KBUILD_ABS_SRCTREE),)
237srctree := $(abs_srctree)
238endif
239
240objtree := .
241VPATH := $(srctree)
242
243export building_out_of_srctree srctree objtree VPATH
244
245# To make sure we do not include .config for any of the *config targets
246# catch them early, and hand them over to scripts/kconfig/Makefile
247# It is allowed to specify more targets when calling make, including
248# mixing *config targets and build targets.
249# For example 'make oldconfig all'.
250# Detect when mixed targets is specified, and make a second invocation
251# of make so .config is not included in this case either (for *config).
252
253version_h := include/generated/uapi/linux/version.h
254old_version_h := include/linux/version.h
255
256clean-targets := %clean mrproper cleandocs
257no-dot-config-targets := $(clean-targets) \
258 cscope gtags TAGS tags help% %docs check% coccicheck \
259 $(version_h) headers headers_% archheaders archscripts \
260 %asm-generic kernelversion %src-pkg dt_binding_check \
261 outputmakefile
262no-sync-config-targets := $(no-dot-config-targets) install %install \
263 kernelrelease
264single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
265
266config-build :=
267mixed-build :=
268need-config := 1
269may-sync-config := 1
270single-build :=
271
272ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
273 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
274 need-config :=
275 endif
276endif
277
278ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
279 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
280 may-sync-config :=
281 endif
282endif
283
284ifneq ($(KBUILD_EXTMOD),)
285 may-sync-config :=
286endif
287
288ifeq ($(KBUILD_EXTMOD),)
289 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
290 config-build := 1
291 ifneq ($(words $(MAKECMDGOALS)),1)
292 mixed-build := 1
293 endif
294 endif
295endif
296
297# We cannot build single targets and the others at the same time
298ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
299 single-build := 1
300 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
301 mixed-build := 1
302 endif
303endif
304
305# For "make -j clean all", "make -j mrproper defconfig all", etc.
306ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
307 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
308 mixed-build := 1
309 endif
310endif
311
312# install and modules_install need also be processed one by one
313ifneq ($(filter install,$(MAKECMDGOALS)),)
314 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
315 mixed-build := 1
316 endif
317endif
318
319ifdef mixed-build
320# ===========================================================================
321# We're called with mixed targets (*config and build targets).
322# Handle them one by one.
323
324PHONY += $(MAKECMDGOALS) __build_one_by_one
325
326$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
327 @:
328
329__build_one_by_one:
330 $(Q)set -e; \
331 for i in $(MAKECMDGOALS); do \
332 $(MAKE) -f $(srctree)/Makefile $$i; \
333 done
334
335else # !mixed-build
336
337include scripts/Kbuild.include
338
339# Read KERNELRELEASE from include/config/kernel.release (if it exists)
340KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
341KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
342export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
343
344include scripts/subarch.include
345
346# Cross compiling and selecting different set of gcc/bin-utils
347# ---------------------------------------------------------------------------
348#
349# When performing cross compilation for other architectures ARCH shall be set
350# to the target architecture. (See arch/* for the possibilities).
351# ARCH can be set during invocation of make:
352# make ARCH=ia64
353# Another way is to have ARCH set in the environment.
354# The default ARCH is the host where make is executed.
355
356# CROSS_COMPILE specify the prefix used for all executables used
357# during compilation. Only gcc and related bin-utils executables
358# are prefixed with $(CROSS_COMPILE).
359# CROSS_COMPILE can be set on the command line
360# make CROSS_COMPILE=ia64-linux-
361# Alternatively CROSS_COMPILE can be set in the environment.
362# Default value for CROSS_COMPILE is not to prefix executables
363# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
364ARCH ?= $(SUBARCH)
365
366# Architecture as present in compile.h
367UTS_MACHINE := $(ARCH)
368SRCARCH := $(ARCH)
369
370# Additional ARCH settings for x86
371ifeq ($(ARCH),i386)
372 SRCARCH := x86
373endif
374ifeq ($(ARCH),x86_64)
375 SRCARCH := x86
376endif
377
378# Additional ARCH settings for sparc
379ifeq ($(ARCH),sparc32)
380 SRCARCH := sparc
381endif
382ifeq ($(ARCH),sparc64)
383 SRCARCH := sparc
384endif
385
386# Additional ARCH settings for sh
387ifeq ($(ARCH),sh64)
388 SRCARCH := sh
389endif
390
391KCONFIG_CONFIG ?= .config
392export KCONFIG_CONFIG
393
394# Default file for 'make defconfig'. This may be overridden by arch-Makefile.
395export KBUILD_DEFCONFIG := defconfig
396
397# SHELL used by kbuild
398CONFIG_SHELL := sh
399
400HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
401HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
402HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
403
404ifneq ($(LLVM),)
405HOSTCC = clang
406HOSTCXX = clang++
407else
408HOSTCC = gcc
409HOSTCXX = g++
410endif
411
412export KBUILD_USERCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
413 -O2 -fomit-frame-pointer -std=gnu89
414export KBUILD_USERLDFLAGS :=
415
416KBUILD_HOSTCFLAGS := $(KBUILD_USERCFLAGS) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
417KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
418KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
419KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
420
421# Make variables (CC, etc...)
422CPP = $(CC) -E
423ifneq ($(LLVM),)
424CC = clang
425LD = ld.lld
426AR = llvm-ar
427NM = llvm-nm
428OBJCOPY = llvm-objcopy
429OBJDUMP = llvm-objdump
430READELF = llvm-readelf
431OBJSIZE = llvm-size
432STRIP = llvm-strip
433else
434CC = $(CROSS_COMPILE)gcc
435LD = $(CROSS_COMPILE)ld
436AR = $(CROSS_COMPILE)ar
437NM = $(CROSS_COMPILE)nm
438OBJCOPY = $(CROSS_COMPILE)objcopy
439OBJDUMP = $(CROSS_COMPILE)objdump
440READELF = $(CROSS_COMPILE)readelf
441OBJSIZE = $(CROSS_COMPILE)size
442STRIP = $(CROSS_COMPILE)strip
443endif
444PAHOLE = pahole
445LEX = flex
446YACC = bison
447AWK = awk
448INSTALLKERNEL := installkernel
449DEPMOD = /sbin/depmod
450PERL = perl
451PYTHON = python
452PYTHON3 = python3
453CHECK = sparse
454BASH = bash
455
456CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
457 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
458NOSTDINC_FLAGS :=
459CFLAGS_MODULE =
460AFLAGS_MODULE =
461LDFLAGS_MODULE =
462CFLAGS_KERNEL =
463AFLAGS_KERNEL =
464LDFLAGS_vmlinux =
465
466# Use USERINCLUDE when you must reference the UAPI directories only.
467USERINCLUDE := \
468 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
469 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
470 -I$(srctree)/include/uapi \
471 -I$(objtree)/include/generated/uapi \
472 -include $(srctree)/include/linux/kconfig.h
473
474# Use LINUXINCLUDE when you must reference the include/ directory.
475# Needed to be compatible with the O= option
476LINUXINCLUDE := \
477 -I$(srctree)/arch/$(SRCARCH)/include \
478 -I$(objtree)/arch/$(SRCARCH)/include/generated \
479 $(if $(building_out_of_srctree),-I$(srctree)/include) \
480 -I$(objtree)/include \
481 $(USERINCLUDE)
482
483KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
484KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
485 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
486 -Werror=implicit-function-declaration -Werror=implicit-int \
487 -Wno-format-security \
488 -std=gnu89
489KBUILD_CPPFLAGS := -D__KERNEL__
490KBUILD_AFLAGS_KERNEL :=
491KBUILD_CFLAGS_KERNEL :=
492KBUILD_AFLAGS_MODULE := -DMODULE
493KBUILD_CFLAGS_MODULE := -DMODULE
494KBUILD_LDFLAGS_MODULE :=
495export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
496KBUILD_LDFLAGS :=
497GCC_PLUGINS_CFLAGS :=
498CLANG_FLAGS :=
499
500export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC
501export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE READELF PAHOLE LEX YACC AWK INSTALLKERNEL
502export PERL PYTHON PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
503export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
504
505export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
506export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
507export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
508export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
509export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
510export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
511
512# Files to ignore in find ... statements
513
514export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
515 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
516 -prune -o
517export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
518 --exclude CVS --exclude .pc --exclude .hg --exclude .git
519
520# ===========================================================================
521# Rules shared between *config targets and build targets
522
523# Basic helpers built in scripts/basic/
524PHONY += scripts_basic
525scripts_basic:
526 $(Q)$(MAKE) $(build)=scripts/basic
527 $(Q)rm -f .tmp_quiet_recordmcount
528
529PHONY += outputmakefile
530# Before starting out-of-tree build, make sure the source tree is clean.
531# outputmakefile generates a Makefile in the output directory, if using a
532# separate output directory. This allows convenient use of make in the
533# output directory.
534# At the same time when output Makefile generated, generate .gitignore to
535# ignore whole output directory
536outputmakefile:
537ifdef building_out_of_srctree
538 $(Q)if [ -f $(srctree)/.config -o \
539 -d $(srctree)/include/config -o \
540 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
541 echo >&2 "***"; \
542 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
543 echo >&2 "*** in $(abs_srctree)";\
544 echo >&2 "***"; \
545 false; \
546 fi
547 $(Q)ln -fsn $(srctree) source
548 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
549 $(Q)test -e .gitignore || \
550 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
551endif
552
553ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
554ifneq ($(CROSS_COMPILE),)
555CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
556GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
557CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
558GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
559endif
560ifneq ($(GCC_TOOLCHAIN),)
561CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
562endif
563ifneq ($(LLVM_IAS),1)
564CLANG_FLAGS += -no-integrated-as
565endif
566CLANG_FLAGS += -Werror=unknown-warning-option
567KBUILD_CFLAGS += $(CLANG_FLAGS)
568KBUILD_AFLAGS += $(CLANG_FLAGS)
569export CLANG_FLAGS
570endif
571
572# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
573# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
574# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
575# and from include/config/auto.conf.cmd to detect the compiler upgrade.
576CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
577
578ifdef config-build
579# ===========================================================================
580# *config targets only - make sure prerequisites are updated, and descend
581# in scripts/kconfig to make the *config target
582
583# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
584# KBUILD_DEFCONFIG may point out an alternative default configuration
585# used for 'make defconfig'
586include arch/$(SRCARCH)/Makefile
587export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
588
589config: outputmakefile scripts_basic FORCE
590 $(Q)$(MAKE) $(build)=scripts/kconfig $@
591
592%config: outputmakefile scripts_basic FORCE
593 $(Q)$(MAKE) $(build)=scripts/kconfig $@
594
595else #!config-build
596# ===========================================================================
597# Build targets only - this includes vmlinux, arch specific targets, clean
598# targets and others. In general all targets except *config targets.
599
600# If building an external module we do not care about the all: rule
601# but instead _all depend on modules
602PHONY += all
603ifeq ($(KBUILD_EXTMOD),)
604_all: all
605else
606_all: modules
607endif
608
609# Decide whether to build built-in, modular, or both.
610# Normally, just do built-in.
611
612KBUILD_MODULES :=
613KBUILD_BUILTIN := 1
614
615# If we have only "make modules", don't compile built-in objects.
616# When we're building modules with modversions, we need to consider
617# the built-in objects during the descend as well, in order to
618# make sure the checksums are up to date before we record them.
619
620ifeq ($(MAKECMDGOALS),modules)
621 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
622endif
623
624# If we have "make <whatever> modules", compile modules
625# in addition to whatever we do anyway.
626# Just "make" or "make all" shall build modules as well
627
628ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
629 KBUILD_MODULES := 1
630endif
631
632ifeq ($(MAKECMDGOALS),)
633 KBUILD_MODULES := 1
634endif
635
636export KBUILD_MODULES KBUILD_BUILTIN
637
638ifdef need-config
639include include/config/auto.conf
640endif
641
642ifeq ($(KBUILD_EXTMOD),)
643# Objects we will link into vmlinux / subdirs we need to visit
644init-y := init/
645drivers-y := drivers/ sound/
646drivers-$(CONFIG_SAMPLES) += samples/
647net-y := net/
648libs-y := lib/
649core-y := usr/
650virt-y := virt/
651endif # KBUILD_EXTMOD
652
653# The all: target is the default when no target is given on the
654# command line.
655# This allow a user to issue only 'make' to build a kernel including modules
656# Defaults to vmlinux, but the arch makefile usually adds further targets
657all: vmlinux
658
659CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
660 $(call cc-option,-fno-tree-loop-im) \
661 $(call cc-disable-warning,maybe-uninitialized,)
662export CFLAGS_GCOV
663
664# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
665ifdef CONFIG_FUNCTION_TRACER
666 CC_FLAGS_FTRACE := -pg
667endif
668
669RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
670RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
671RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
672RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
673RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
674RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
675export RETPOLINE_CFLAGS
676export RETPOLINE_VDSO_CFLAGS
677
678include arch/$(SRCARCH)/Makefile
679
680ifdef need-config
681ifdef may-sync-config
682# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
683# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
684# because some architectures define CROSS_COMPILE there.
685include include/config/auto.conf.cmd
686
687$(KCONFIG_CONFIG):
688 @echo >&2 '***'
689 @echo >&2 '*** Configuration file "$@" not found!'
690 @echo >&2 '***'
691 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
692 @echo >&2 '*** "make menuconfig" or "make xconfig").'
693 @echo >&2 '***'
694 @/bin/false
695
696# The actual configuration files used during the build are stored in
697# include/generated/ and include/config/. Update them if .config is newer than
698# include/config/auto.conf (which mirrors .config).
699#
700# This exploits the 'multi-target pattern rule' trick.
701# The syncconfig should be executed only once to make all the targets.
702# (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
703%/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h: $(KCONFIG_CONFIG)
704 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
705else # !may-sync-config
706# External modules and some install targets need include/generated/autoconf.h
707# and include/config/auto.conf but do not care if they are up-to-date.
708# Use auto.conf to trigger the test
709PHONY += include/config/auto.conf
710
711include/config/auto.conf:
712 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
713 echo >&2; \
714 echo >&2 " ERROR: Kernel configuration is invalid."; \
715 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
716 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
717 echo >&2 ; \
718 /bin/false)
719
720endif # may-sync-config
721endif # need-config
722
723KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
724KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
725KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
726KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
727KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
728
729ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
730KBUILD_CFLAGS += -O2
731else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
732KBUILD_CFLAGS += -O3
733else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
734KBUILD_CFLAGS += -Os
735endif
736
737# Tell gcc to never replace conditional load with a non-conditional one
738KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
739KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
740
741include scripts/Makefile.kcov
742include scripts/Makefile.gcc-plugins
743
744ifdef CONFIG_READABLE_ASM
745# Disable optimizations that make assembler listings hard to read.
746# reorder blocks reorders the control in the function
747# ipa clone creates specialized cloned functions
748# partial inlining inlines only parts of functions
749KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
750 $(call cc-option,-fno-ipa-cp-clone,) \
751 $(call cc-option,-fno-partial-inlining)
752endif
753
754ifneq ($(CONFIG_FRAME_WARN),0)
755KBUILD_CFLAGS += -Wframe-larger-than=$(CONFIG_FRAME_WARN)
756endif
757
758stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
759stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
760stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
761
762KBUILD_CFLAGS += $(stackp-flags-y)
763
764ifdef CONFIG_CC_IS_CLANG
765KBUILD_CPPFLAGS += -Qunused-arguments
766KBUILD_CFLAGS += -Wno-format-invalid-specifier
767KBUILD_CFLAGS += -Wno-gnu
768# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
769# source of a reference will be _MergedGlobals and not on of the whitelisted names.
770# See modpost pattern 2
771KBUILD_CFLAGS += -mno-global-merge
772else
773
774# These warnings generated too much noise in a regular build.
775# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
776KBUILD_CFLAGS += -Wno-unused-but-set-variable
777
778# Warn about unmarked fall-throughs in switch statement.
779# Disabled for clang while comment to attribute conversion happens and
780# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
781KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
782endif
783
784KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
785ifdef CONFIG_FRAME_POINTER
786KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
787else
788# Some targets (ARM with Thumb2, for example), can't be built with frame
789# pointers. For those, we don't have FUNCTION_TRACER automatically
790# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
791# incompatible with -fomit-frame-pointer with current GCC, so we don't use
792# -fomit-frame-pointer with FUNCTION_TRACER.
793ifndef CONFIG_FUNCTION_TRACER
794KBUILD_CFLAGS += -fomit-frame-pointer
795endif
796endif
797
798# Initialize all stack variables with a pattern, if desired.
799ifdef CONFIG_INIT_STACK_ALL
800KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
801endif
802
803DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
804
805ifdef CONFIG_DEBUG_INFO
806ifdef CONFIG_DEBUG_INFO_SPLIT
807DEBUG_CFLAGS += -gsplit-dwarf
808else
809DEBUG_CFLAGS += -g
810endif
811KBUILD_AFLAGS += -Wa,-gdwarf-2
812endif
813ifdef CONFIG_DEBUG_INFO_DWARF4
814DEBUG_CFLAGS += -gdwarf-4
815endif
816
817ifdef CONFIG_DEBUG_INFO_REDUCED
818DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
819 $(call cc-option,-fno-var-tracking)
820endif
821
822KBUILD_CFLAGS += $(DEBUG_CFLAGS)
823export DEBUG_CFLAGS
824
825ifdef CONFIG_FUNCTION_TRACER
826ifdef CONFIG_FTRACE_MCOUNT_RECORD
827 # gcc 5 supports generating the mcount tables directly
828 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
829 CC_FLAGS_FTRACE += -mrecord-mcount
830 export CC_USING_RECORD_MCOUNT := 1
831 endif
832 ifdef CONFIG_HAVE_NOP_MCOUNT
833 ifeq ($(call cc-option-yn, -mnop-mcount),y)
834 CC_FLAGS_FTRACE += -mnop-mcount
835 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
836 endif
837 endif
838endif
839ifdef CONFIG_HAVE_FENTRY
840 ifeq ($(call cc-option-yn, -mfentry),y)
841 CC_FLAGS_FTRACE += -mfentry
842 CC_FLAGS_USING += -DCC_USING_FENTRY
843 endif
844endif
845export CC_FLAGS_FTRACE
846KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
847KBUILD_AFLAGS += $(CC_FLAGS_USING)
848ifdef CONFIG_DYNAMIC_FTRACE
849 ifdef CONFIG_HAVE_C_RECORDMCOUNT
850 BUILD_C_RECORDMCOUNT := y
851 export BUILD_C_RECORDMCOUNT
852 endif
853endif
854endif
855
856# We trigger additional mismatches with less inlining
857ifdef CONFIG_DEBUG_SECTION_MISMATCH
858KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
859endif
860
861ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
862KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
863LDFLAGS_vmlinux += --gc-sections
864endif
865
866ifdef CONFIG_LIVEPATCH
867KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
868endif
869
870# arch Makefile may override CC so keep this after arch Makefile is included
871NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
872
873# warn about C99 declaration after statement
874KBUILD_CFLAGS += -Wdeclaration-after-statement
875
876# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
877KBUILD_CFLAGS += -Wvla
878
879# disable pointer signed / unsigned warnings in gcc 4.0
880KBUILD_CFLAGS += -Wno-pointer-sign
881
882# disable stringop warnings in gcc 8+
883KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
884
885# We'll want to enable this eventually, but it's not going away for 5.7 at least
886KBUILD_CFLAGS += $(call cc-disable-warning, zero-length-bounds)
887KBUILD_CFLAGS += $(call cc-disable-warning, array-bounds)
888KBUILD_CFLAGS += $(call cc-disable-warning, stringop-overflow)
889
890# Another good warning that we'll want to enable eventually
891KBUILD_CFLAGS += $(call cc-disable-warning, restrict)
892
893# Enabled with W=2, disabled by default as noisy
894KBUILD_CFLAGS += $(call cc-disable-warning, maybe-uninitialized)
895
896# disable invalid "can't wrap" optimizations for signed / pointers
897KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
898
899# clang sets -fmerge-all-constants by default as optimization, but this
900# is non-conforming behavior for C and in fact breaks the kernel, so we
901# need to disable it here generally.
902KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
903
904# for gcc -fno-merge-all-constants disables everything, but it is fine
905# to have actual conforming behavior enabled.
906KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
907
908# Make sure -fstack-check isn't enabled (like gentoo apparently did)
909KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
910
911# conserve stack if available
912KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
913
914# Prohibit date/time macros, which would make the build non-deterministic
915KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
916
917# enforce correct pointer usage
918KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
919
920# Require designated initializers for all marked structures
921KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
922
923# change __FILE__ to the relative path from the srctree
924KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
925
926# ensure -fcf-protection is disabled when using retpoline as it is
927# incompatible with -mindirect-branch=thunk-extern
928ifdef CONFIG_RETPOLINE
929KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
930endif
931
932include scripts/Makefile.kasan
933include scripts/Makefile.extrawarn
934include scripts/Makefile.ubsan
935
936# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
937KBUILD_CPPFLAGS += $(KCPPFLAGS)
938KBUILD_AFLAGS += $(KAFLAGS)
939KBUILD_CFLAGS += $(KCFLAGS)
940
941KBUILD_LDFLAGS_MODULE += --build-id
942LDFLAGS_vmlinux += --build-id
943
944ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
945LDFLAGS_vmlinux += $(call ld-option, -X,)
946endif
947
948ifeq ($(CONFIG_RELR),y)
949LDFLAGS_vmlinux += --pack-dyn-relocs=relr
950endif
951
952# Align the bit size of userspace programs with the kernel
953KBUILD_USERCFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
954KBUILD_USERLDFLAGS += $(filter -m32 -m64, $(KBUILD_CFLAGS))
955
956# make the checker run with the right architecture
957CHECKFLAGS += --arch=$(ARCH)
958
959# insure the checker run with the right endianness
960CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
961
962# the checker needs the correct machine size
963CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
964
965# Default kernel image to build when no specific target is given.
966# KBUILD_IMAGE may be overruled on the command line or
967# set in the environment
968# Also any assignments in arch/$(ARCH)/Makefile take precedence over
969# this default value
970export KBUILD_IMAGE ?= vmlinux
971
972#
973# INSTALL_PATH specifies where to place the updated kernel and system map
974# images. Default is /boot, but you can set it to other values
975export INSTALL_PATH ?= /boot
976
977#
978# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
979# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
980# an argument if needed. Otherwise it defaults to the kernel install path
981#
982export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
983
984#
985# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
986# relocations required by build roots. This is not defined in the
987# makefile but the argument can be passed to make if needed.
988#
989
990MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
991export MODLIB
992
993#
994# INSTALL_MOD_STRIP, if defined, will cause modules to be
995# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
996# the default option --strip-debug will be used. Otherwise,
997# INSTALL_MOD_STRIP value will be used as the options to the strip command.
998
999ifdef INSTALL_MOD_STRIP
1000ifeq ($(INSTALL_MOD_STRIP),1)
1001mod_strip_cmd = $(STRIP) --strip-debug
1002else
1003mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
1004endif # INSTALL_MOD_STRIP=1
1005else
1006mod_strip_cmd = true
1007endif # INSTALL_MOD_STRIP
1008export mod_strip_cmd
1009
1010# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
1011# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
1012# or CONFIG_MODULE_COMPRESS_XZ.
1013
1014mod_compress_cmd = true
1015ifdef CONFIG_MODULE_COMPRESS
1016 ifdef CONFIG_MODULE_COMPRESS_GZIP
1017 mod_compress_cmd = gzip -n -f
1018 endif # CONFIG_MODULE_COMPRESS_GZIP
1019 ifdef CONFIG_MODULE_COMPRESS_XZ
1020 mod_compress_cmd = xz -f
1021 endif # CONFIG_MODULE_COMPRESS_XZ
1022endif # CONFIG_MODULE_COMPRESS
1023export mod_compress_cmd
1024
1025ifdef CONFIG_MODULE_SIG_ALL
1026$(eval $(call config_filename,MODULE_SIG_KEY))
1027
1028mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
1029else
1030mod_sign_cmd = true
1031endif
1032export mod_sign_cmd
1033
1034HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
1035
1036ifdef CONFIG_STACK_VALIDATION
1037 has_libelf := $(call try-run,\
1038 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1039 ifeq ($(has_libelf),1)
1040 objtool_target := tools/objtool FORCE
1041 else
1042 SKIP_STACK_VALIDATION := 1
1043 export SKIP_STACK_VALIDATION
1044 endif
1045endif
1046
1047PHONY += prepare0
1048
1049export MODORDER := $(extmod-prefix)modules.order
1050export MODULES_NSDEPS := $(extmod-prefix)modules.nsdeps
1051
1052ifeq ($(KBUILD_EXTMOD),)
1053core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
1054
1055vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1056 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1057 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1058
1059vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1060 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1061 $(drivers-) $(net-) $(libs-) $(virt-))))
1062
1063build-dirs := $(vmlinux-dirs)
1064clean-dirs := $(vmlinux-alldirs)
1065
1066init-y := $(patsubst %/, %/built-in.a, $(init-y))
1067core-y := $(patsubst %/, %/built-in.a, $(core-y))
1068drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1069net-y := $(patsubst %/, %/built-in.a, $(net-y))
1070libs-y2 := $(patsubst %/, %/built-in.a, $(filter %/, $(libs-y)))
1071ifdef CONFIG_MODULES
1072libs-y1 := $(filter-out %/, $(libs-y))
1073libs-y2 += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1074else
1075libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1076endif
1077virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1078
1079# Externally visible symbols (used by link-vmlinux.sh)
1080export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1081 $(drivers-y) $(net-y) $(virt-y)
1082export KBUILD_VMLINUX_LIBS := $(libs-y1)
1083export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1084export LDFLAGS_vmlinux
1085# used by scripts/Makefile.package
1086export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1087
1088vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1089
1090# Recurse until adjust_autoksyms.sh is satisfied
1091PHONY += autoksyms_recursive
1092ifdef CONFIG_TRIM_UNUSED_KSYMS
1093autoksyms_recursive: descend modules.order
1094 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1095 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1096endif
1097
1098# For the kernel to actually contain only the needed exported symbols,
1099# we have to build modules as well to determine what those symbols are.
1100# (this can be evaluated only once include/config/auto.conf has been included)
1101ifdef CONFIG_TRIM_UNUSED_KSYMS
1102 KBUILD_MODULES := 1
1103endif
1104
1105autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1106
1107quiet_cmd_autoksyms_h = GEN $@
1108 cmd_autoksyms_h = mkdir -p $(dir $@); \
1109 $(CONFIG_SHELL) $(srctree)/scripts/gen_autoksyms.sh $@
1110
1111$(autoksyms_h):
1112 $(call cmd,autoksyms_h)
1113
1114ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1115
1116# Final link of vmlinux with optional arch pass after final link
1117cmd_link-vmlinux = \
1118 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1119 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1120
1121vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1122 +$(call if_changed,link-vmlinux)
1123
1124targets := vmlinux
1125
1126# The actual objects are generated when descending,
1127# make sure no implicit rule kicks in
1128$(sort $(vmlinux-deps)): descend ;
1129
1130filechk_kernel.release = \
1131 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1132
1133# Store (new) KERNELRELEASE string in include/config/kernel.release
1134include/config/kernel.release: FORCE
1135 $(call filechk,kernel.release)
1136
1137# Additional helpers built in scripts/
1138# Carefully list dependencies so we do not try to build scripts twice
1139# in parallel
1140PHONY += scripts
1141scripts: scripts_basic scripts_dtc
1142 $(Q)$(MAKE) $(build)=$(@)
1143
1144# Things we need to do before we recursively start building the kernel
1145# or the modules are listed in "prepare".
1146# A multi level approach is used. prepareN is processed before prepareN-1.
1147# archprepare is used in arch Makefiles and when processed asm symlink,
1148# version.h and scripts_basic is processed / created.
1149
1150PHONY += prepare archprepare
1151
1152archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1153 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1154 include/generated/autoconf.h
1155
1156prepare0: archprepare
1157 $(Q)$(MAKE) $(build)=scripts/mod
1158 $(Q)$(MAKE) $(build)=.
1159
1160# All the preparing..
1161prepare: prepare0 prepare-objtool
1162
1163# Support for using generic headers in asm-generic
1164asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1165
1166PHONY += asm-generic uapi-asm-generic
1167asm-generic: uapi-asm-generic
1168 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1169 generic=include/asm-generic
1170uapi-asm-generic:
1171 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1172 generic=include/uapi/asm-generic
1173
1174PHONY += prepare-objtool
1175prepare-objtool: $(objtool_target)
1176ifeq ($(SKIP_STACK_VALIDATION),1)
1177ifdef CONFIG_UNWINDER_ORC
1178 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1179 @false
1180else
1181 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1182endif
1183endif
1184
1185# Generate some files
1186# ---------------------------------------------------------------------------
1187
1188# KERNELRELEASE can change from a few different places, meaning version.h
1189# needs to be updated, so this check is forced on all builds
1190
1191uts_len := 64
1192define filechk_utsrelease.h
1193 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1194 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1195 exit 1; \
1196 fi; \
1197 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1198endef
1199
1200define filechk_version.h
1201 echo \#define LINUX_VERSION_CODE $(shell \
1202 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1203 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1204endef
1205
1206$(version_h): FORCE
1207 $(call filechk,version.h)
1208 $(Q)rm -f $(old_version_h)
1209
1210include/generated/utsrelease.h: include/config/kernel.release FORCE
1211 $(call filechk,utsrelease.h)
1212
1213PHONY += headerdep
1214headerdep:
1215 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1216 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1217
1218# ---------------------------------------------------------------------------
1219# Kernel headers
1220
1221#Default location for installed headers
1222export INSTALL_HDR_PATH = $(objtree)/usr
1223
1224quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1225 cmd_headers_install = \
1226 mkdir -p $(INSTALL_HDR_PATH); \
1227 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1228 usr/include $(INSTALL_HDR_PATH)
1229
1230PHONY += headers_install
1231headers_install: headers
1232 $(call cmd,headers_install)
1233
1234PHONY += archheaders archscripts
1235
1236hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1237
1238PHONY += headers
1239headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1240 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1241 $(error Headers not exportable for the $(SRCARCH) architecture))
1242 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1243 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1244
1245# Deprecated. It is no-op now.
1246PHONY += headers_check
1247headers_check:
1248 @:
1249
1250ifdef CONFIG_HEADERS_INSTALL
1251prepare: headers
1252endif
1253
1254PHONY += scripts_unifdef
1255scripts_unifdef: scripts_basic
1256 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1257
1258# ---------------------------------------------------------------------------
1259# Kernel selftest
1260
1261PHONY += kselftest
1262kselftest:
1263 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1264
1265kselftest-%: FORCE
1266 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1267
1268PHONY += kselftest-merge
1269kselftest-merge:
1270 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1271 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1272 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1273 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1274
1275# ---------------------------------------------------------------------------
1276# Devicetree files
1277
1278ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1279dtstree := arch/$(SRCARCH)/boot/dts
1280endif
1281
1282ifneq ($(dtstree),)
1283
1284%.dtb: include/config/kernel.release scripts_dtc
1285 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1286
1287PHONY += dtbs dtbs_install dtbs_check
1288dtbs: include/config/kernel.release scripts_dtc
1289 $(Q)$(MAKE) $(build)=$(dtstree)
1290
1291ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1292export CHECK_DTBS=y
1293dtbs: dt_binding_check
1294endif
1295
1296dtbs_check: dtbs
1297
1298dtbs_install:
1299 $(Q)$(MAKE) $(dtbinst)=$(dtstree) dst=$(INSTALL_DTBS_PATH)
1300
1301ifdef CONFIG_OF_EARLY_FLATTREE
1302all: dtbs
1303endif
1304
1305endif
1306
1307PHONY += scripts_dtc
1308scripts_dtc: scripts_basic
1309 $(Q)$(MAKE) $(build)=scripts/dtc
1310
1311ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1312export CHECK_DT_BINDING=y
1313endif
1314
1315PHONY += dt_binding_check
1316dt_binding_check: scripts_dtc
1317 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1318
1319# ---------------------------------------------------------------------------
1320# Modules
1321
1322ifdef CONFIG_MODULES
1323
1324# By default, build modules as well
1325
1326all: modules
1327
1328# Build modules
1329#
1330# A module can be listed more than once in obj-m resulting in
1331# duplicate lines in modules.order files. Those are removed
1332# using awk while concatenating to the final file.
1333
1334PHONY += modules
1335modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order
1336 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1337 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1338
1339modules.order: descend
1340 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1341
1342# Target to prepare building external modules
1343PHONY += modules_prepare
1344modules_prepare: prepare
1345
1346# Target to install modules
1347PHONY += modules_install
1348modules_install: _modinst_ _modinst_post
1349
1350PHONY += _modinst_
1351_modinst_:
1352 @rm -rf $(MODLIB)/kernel
1353 @rm -f $(MODLIB)/source
1354 @mkdir -p $(MODLIB)/kernel
1355 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1356 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1357 rm -f $(MODLIB)/build ; \
1358 ln -s $(CURDIR) $(MODLIB)/build ; \
1359 fi
1360 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1361 @cp -f modules.builtin $(MODLIB)/
1362 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1363 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1364
1365# This depmod is only for convenience to give the initial
1366# boot a modules.dep even before / is mounted read-write. However the
1367# boot script depmod is the master version.
1368PHONY += _modinst_post
1369_modinst_post: _modinst_
1370 $(call cmd,depmod)
1371
1372ifeq ($(CONFIG_MODULE_SIG), y)
1373PHONY += modules_sign
1374modules_sign:
1375 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1376endif
1377
1378else # CONFIG_MODULES
1379
1380# Modules not configured
1381# ---------------------------------------------------------------------------
1382
1383PHONY += modules modules_install
1384modules modules_install:
1385 @echo >&2
1386 @echo >&2 "The present kernel configuration has modules disabled."
1387 @echo >&2 "Type 'make config' and enable loadable module support."
1388 @echo >&2 "Then build a kernel with module support enabled."
1389 @echo >&2
1390 @exit 1
1391
1392endif # CONFIG_MODULES
1393
1394###
1395# Cleaning is done on three levels.
1396# make clean Delete most generated files
1397# Leave enough to build external modules
1398# make mrproper Delete the current configuration, and all generated files
1399# make distclean Remove editor backup files, patch leftover files and the like
1400
1401# Directories & files removed with 'make clean'
1402CLEAN_FILES += include/ksym \
1403 modules.builtin modules.builtin.modinfo modules.nsdeps
1404
1405# Directories & files removed with 'make mrproper'
1406MRPROPER_FILES += include/config include/generated \
1407 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1408 debian snap tar-install \
1409 .config .config.old .version \
1410 Module.symvers \
1411 signing_key.pem signing_key.priv signing_key.x509 \
1412 x509.genkey extra_certificates signing_key.x509.keyid \
1413 signing_key.x509.signer vmlinux-gdb.py \
1414 *.spec
1415
1416# Directories & files removed with 'make distclean'
1417DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1418
1419# clean - Delete most, but leave enough to build external modules
1420#
1421clean: rm-files := $(CLEAN_FILES)
1422
1423PHONY += archclean vmlinuxclean
1424
1425vmlinuxclean:
1426 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1427 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1428
1429clean: archclean vmlinuxclean
1430
1431# mrproper - Delete all generated files, including .config
1432#
1433mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1434mrproper-dirs := $(addprefix _mrproper_,scripts)
1435
1436PHONY += $(mrproper-dirs) mrproper
1437$(mrproper-dirs):
1438 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1439
1440mrproper: clean $(mrproper-dirs)
1441 $(call cmd,rmfiles)
1442
1443# distclean
1444#
1445distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1446
1447PHONY += distclean
1448
1449distclean: mrproper
1450 $(call cmd,rmfiles)
1451 @find $(srctree) $(RCS_FIND_IGNORE) \
1452 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1453 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1454 -o -name 'core' \) \
1455 -type f -print | xargs rm -f
1456
1457
1458# Packaging of the kernel to various formats
1459# ---------------------------------------------------------------------------
1460
1461%src-pkg: FORCE
1462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1463%pkg: include/config/kernel.release FORCE
1464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1465
1466# Brief documentation of the typical targets used
1467# ---------------------------------------------------------------------------
1468
1469boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1470boards := $(sort $(notdir $(boards)))
1471board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1472board-dirs := $(sort $(notdir $(board-dirs:/=)))
1473
1474PHONY += help
1475help:
1476 @echo 'Cleaning targets:'
1477 @echo ' clean - Remove most generated files but keep the config and'
1478 @echo ' enough build support to build external modules'
1479 @echo ' mrproper - Remove all generated files + config + various backup files'
1480 @echo ' distclean - mrproper + remove editor backup and patch files'
1481 @echo ''
1482 @echo 'Configuration targets:'
1483 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1484 @echo ''
1485 @echo 'Other generic targets:'
1486 @echo ' all - Build all targets marked with [*]'
1487 @echo '* vmlinux - Build the bare kernel'
1488 @echo '* modules - Build all modules'
1489 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1490 @echo ' dir/ - Build all files in dir and below'
1491 @echo ' dir/file.[ois] - Build specified target only'
1492 @echo ' dir/file.ll - Build the LLVM assembly file'
1493 @echo ' (requires compiler support for LLVM assembly generation)'
1494 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1495 @echo ' (requires a recent binutils and recent build (System.map))'
1496 @echo ' dir/file.ko - Build module including final link'
1497 @echo ' modules_prepare - Set up for building external modules'
1498 @echo ' tags/TAGS - Generate tags file for editors'
1499 @echo ' cscope - Generate cscope index'
1500 @echo ' gtags - Generate GNU GLOBAL index'
1501 @echo ' kernelrelease - Output the release version string (use with make -s)'
1502 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1503 @echo ' image_name - Output the image name (use with make -s)'
1504 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1505 echo ' (default: $(INSTALL_HDR_PATH))'; \
1506 echo ''
1507 @echo 'Static analysers:'
1508 @echo ' checkstack - Generate a list of stack hogs'
1509 @echo ' namespacecheck - Name space analysis on compiled kernel'
1510 @echo ' versioncheck - Sanity check on version.h usage'
1511 @echo ' includecheck - Check for duplicate included header files'
1512 @echo ' export_report - List the usages of all exported symbols'
1513 @echo ' headerdep - Detect inclusion cycles in headers'
1514 @echo ' coccicheck - Check with Coccinelle'
1515 @echo ''
1516 @echo 'Tools:'
1517 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1518 @echo ''
1519 @echo 'Kernel selftest:'
1520 @echo ' kselftest - Build and run kernel selftest'
1521 @echo ' Build, install, and boot kernel before'
1522 @echo ' running kselftest on it'
1523 @echo ' Run as root for full coverage'
1524 @echo ' kselftest-all - Build kernel selftest'
1525 @echo ' kselftest-install - Build and install kernel selftest'
1526 @echo ' kselftest-clean - Remove all generated kselftest files'
1527 @echo ' kselftest-merge - Merge all the config dependencies of'
1528 @echo ' kselftest to existing .config.'
1529 @echo ''
1530 @$(if $(dtstree), \
1531 echo 'Devicetree:'; \
1532 echo '* dtbs - Build device tree blobs for enabled boards'; \
1533 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1534 echo ' dt_binding_check - Validate device tree binding documents'; \
1535 echo ' dtbs_check - Validate device tree source files';\
1536 echo '')
1537
1538 @echo 'Userspace tools targets:'
1539 @echo ' use "make tools/help"'
1540 @echo ' or "cd tools; make help"'
1541 @echo ''
1542 @echo 'Kernel packaging:'
1543 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1544 @echo ''
1545 @echo 'Documentation targets:'
1546 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1547 @echo ''
1548 @echo 'Architecture specific targets ($(SRCARCH)):'
1549 @$(if $(archhelp),$(archhelp),\
1550 echo ' No architecture specific help defined for $(SRCARCH)')
1551 @echo ''
1552 @$(if $(boards), \
1553 $(foreach b, $(boards), \
1554 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1555 echo '')
1556 @$(if $(board-dirs), \
1557 $(foreach b, $(board-dirs), \
1558 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1559 printf " %-16s - Show all of the above\\n" help-boards; \
1560 echo '')
1561
1562 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1563 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1564 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1565 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1566 @echo ' (sparse by default)'
1567 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1568 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1569 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1570 @echo ' 1: warnings which may be relevant and do not occur too often'
1571 @echo ' 2: warnings which occur quite often but may still be relevant'
1572 @echo ' 3: more obscure warnings, can most likely be ignored'
1573 @echo ' Multiple levels can be combined with W=12 or W=123'
1574 @echo ''
1575 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1576 @echo 'For further info see the ./README file'
1577
1578
1579help-board-dirs := $(addprefix help-,$(board-dirs))
1580
1581help-boards: $(help-board-dirs)
1582
1583boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1584
1585$(help-board-dirs): help-%:
1586 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1587 @$(if $(boards-per-dir), \
1588 $(foreach b, $(boards-per-dir), \
1589 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1590 echo '')
1591
1592
1593# Documentation targets
1594# ---------------------------------------------------------------------------
1595DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1596 linkcheckdocs dochelp refcheckdocs
1597PHONY += $(DOC_TARGETS)
1598$(DOC_TARGETS):
1599 $(Q)$(MAKE) $(build)=Documentation $@
1600
1601# Misc
1602# ---------------------------------------------------------------------------
1603
1604PHONY += scripts_gdb
1605scripts_gdb: prepare0
1606 $(Q)$(MAKE) $(build)=scripts/gdb
1607 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1608
1609ifdef CONFIG_GDB_SCRIPTS
1610all: scripts_gdb
1611endif
1612
1613else # KBUILD_EXTMOD
1614
1615###
1616# External module support.
1617# When building external modules the kernel used as basis is considered
1618# read-only, and no consistency checks are made and the make
1619# system is not used on the basis kernel. If updates are required
1620# in the basis kernel ordinary make commands (without M=...) must
1621# be used.
1622#
1623# The following are the only valid targets when building external
1624# modules.
1625# make M=dir clean Delete all automatically generated files
1626# make M=dir modules Make all modules in specified dir
1627# make M=dir Same as 'make M=dir modules'
1628# make M=dir modules_install
1629# Install the modules built in the module directory
1630# Assumes install directory is already created
1631
1632# We are always building modules
1633KBUILD_MODULES := 1
1634
1635PHONY += $(objtree)/Module.symvers
1636$(objtree)/Module.symvers:
1637 @test -e $(objtree)/Module.symvers || ( \
1638 echo; \
1639 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1640 echo " is missing; modules will have no dependencies and modversions."; \
1641 echo )
1642
1643build-dirs := $(KBUILD_EXTMOD)
1644PHONY += modules
1645modules: descend $(objtree)/Module.symvers
1646 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1647
1648PHONY += modules_install
1649modules_install: _emodinst_ _emodinst_post
1650
1651install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1652PHONY += _emodinst_
1653_emodinst_:
1654 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1655 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1656
1657PHONY += _emodinst_post
1658_emodinst_post: _emodinst_
1659 $(call cmd,depmod)
1660
1661clean-dirs := $(KBUILD_EXTMOD)
1662clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps
1663
1664PHONY += help
1665help:
1666 @echo ' Building external modules.'
1667 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1668 @echo ''
1669 @echo ' modules - default target, build the module(s)'
1670 @echo ' modules_install - install the module'
1671 @echo ' clean - remove generated files in module directory only'
1672 @echo ''
1673
1674PHONY += prepare
1675endif # KBUILD_EXTMOD
1676
1677# Single targets
1678# ---------------------------------------------------------------------------
1679# To build individual files in subdirectories, you can do like this:
1680#
1681# make foo/bar/baz.s
1682#
1683# The supported suffixes for single-target are listed in 'single-targets'
1684#
1685# To build only under specific subdirectories, you can do like this:
1686#
1687# make foo/bar/baz/
1688
1689ifdef single-build
1690
1691# .ko is special because modpost is needed
1692single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1693single-no-ko := $(sort $(patsubst %.ko,%.mod, $(MAKECMDGOALS)))
1694
1695$(single-ko): single_modpost
1696 @:
1697$(single-no-ko): descend
1698 @:
1699
1700ifeq ($(KBUILD_EXTMOD),)
1701# For the single build of in-tree modules, use a temporary file to avoid
1702# the situation of modules_install installing an invalid modules.order.
1703MODORDER := .modules.tmp
1704endif
1705
1706PHONY += single_modpost
1707single_modpost: $(single-no-ko)
1708 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1709 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1710
1711KBUILD_MODULES := 1
1712
1713export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1714
1715# trim unrelated directories
1716build-dirs := $(foreach d, $(build-dirs), \
1717 $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
1718
1719endif
1720
1721# Handle descending into subdirectories listed in $(build-dirs)
1722# Preset locale variables to speed up the build process. Limit locale
1723# tweaks to this spot to avoid wrong language settings when running
1724# make menuconfig etc.
1725# Error messages still appears in the original language
1726PHONY += descend $(build-dirs)
1727descend: $(build-dirs)
1728$(build-dirs): prepare
1729 $(Q)$(MAKE) $(build)=$@ \
1730 single-build=$(if $(filter-out $@/, $(filter $@/%, $(single-no-ko))),1) \
1731 need-builtin=1 need-modorder=1
1732
1733clean-dirs := $(addprefix _clean_, $(clean-dirs))
1734PHONY += $(clean-dirs) clean
1735$(clean-dirs):
1736 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1737
1738clean: $(clean-dirs)
1739 $(call cmd,rmfiles)
1740 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1741 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1742 -o -name '*.ko.*' \
1743 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1744 -o -name '*.dwo' -o -name '*.lst' \
1745 -o -name '*.su' -o -name '*.mod' \
1746 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1747 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1748 -o -name '*.asn1.[ch]' \
1749 -o -name '*.symtypes' -o -name 'modules.order' \
1750 -o -name '.tmp_*.o.*' \
1751 -o -name '*.c.[012]*.*' \
1752 -o -name '*.ll' \
1753 -o -name '*.gcno' \) -type f -print | xargs rm -f
1754
1755# Generate tags for editors
1756# ---------------------------------------------------------------------------
1757quiet_cmd_tags = GEN $@
1758 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1759
1760tags TAGS cscope gtags: FORCE
1761 $(call cmd,tags)
1762
1763# Script to generate missing namespace dependencies
1764# ---------------------------------------------------------------------------
1765
1766PHONY += nsdeps
1767nsdeps: export KBUILD_NSDEPS=1
1768nsdeps: modules
1769 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1770
1771# Scripts to check various things for consistency
1772# ---------------------------------------------------------------------------
1773
1774PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1775
1776includecheck:
1777 find $(srctree)/* $(RCS_FIND_IGNORE) \
1778 -name '*.[hcS]' -type f -print | sort \
1779 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1780
1781versioncheck:
1782 find $(srctree)/* $(RCS_FIND_IGNORE) \
1783 -name '*.[hcS]' -type f -print | sort \
1784 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1785
1786coccicheck:
1787 $(Q)$(BASH) $(srctree)/scripts/$@
1788
1789namespacecheck:
1790 $(PERL) $(srctree)/scripts/namespace.pl
1791
1792export_report:
1793 $(PERL) $(srctree)/scripts/export_report.pl
1794
1795PHONY += checkstack kernelrelease kernelversion image_name
1796
1797# UML needs a little special treatment here. It wants to use the host
1798# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1799# else wants $(ARCH), including people doing cross-builds, which means
1800# that $(SUBARCH) doesn't work here.
1801ifeq ($(ARCH), um)
1802CHECKSTACK_ARCH := $(SUBARCH)
1803else
1804CHECKSTACK_ARCH := $(ARCH)
1805endif
1806checkstack:
1807 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1808 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1809
1810kernelrelease:
1811 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1812
1813kernelversion:
1814 @echo $(KERNELVERSION)
1815
1816image_name:
1817 @echo $(KBUILD_IMAGE)
1818
1819# Clear a bunch of variables before executing the submake
1820
1821ifeq ($(quiet),silent_)
1822tools_silent=s
1823endif
1824
1825tools/: FORCE
1826 $(Q)mkdir -p $(objtree)/tools
1827 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1828
1829tools/%: FORCE
1830 $(Q)mkdir -p $(objtree)/tools
1831 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1832
1833quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1834 cmd_rmfiles = rm -rf $(rm-files)
1835
1836# Run depmod only if we have System.map and depmod is executable
1837quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1838 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1839 $(KERNELRELEASE)
1840
1841# read saved command lines for existing targets
1842existing-targets := $(wildcard $(sort $(targets)))
1843
1844-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1845
1846endif # config-build
1847endif # mixed-build
1848endif # need-sub-make
1849
1850PHONY += FORCE
1851FORCE:
1852
1853# Declare the contents of the PHONY variable as phony. We keep that
1854# information in a variable so we can use it in if_changed and friends.
1855.PHONY: $(PHONY)