Makefile: Fix lying comment re. silentoldconfig
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1# SPDX-License-Identifier: GPL-2.0
2VERSION = 4
3PATCHLEVEL = 16
4SUBLEVEL = 0
5EXTRAVERSION = -rc3
6NAME = Fearless Coyote
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# o Do not use make's built-in rules and variables
19# (this increases performance and avoids hard-to-debug behaviour);
20# o Look for make include files relative to root of kernel src
21MAKEFLAGS += -rR --include-dir=$(CURDIR)
22
23# Avoid funny character set dependencies
24unexport LC_ALL
25LC_COLLATE=C
26LC_NUMERIC=C
27export LC_COLLATE LC_NUMERIC
28
29# Avoid interference with shell env settings
30unexport GREP_OPTIONS
31
32# We are using a recursive build, so we need to do a little thinking
33# to get the ordering right.
34#
35# Most importantly: sub-Makefiles should only ever modify files in
36# their own directory. If in some directory we have a dependency on
37# a file in another dir (which doesn't happen often, but it's often
38# unavoidable when linking the built-in.o targets which finally
39# turn into vmlinux), we will call a sub make in that other dir, and
40# after that we are sure that everything which is in that other dir
41# is now up to date.
42#
43# The only cases where we need to modify files which have global
44# effects are thus separated out and done before the recursive
45# descending is started. They are now explicitly listed as the
46# prepare rule.
47
48# Beautify output
49# ---------------------------------------------------------------------------
50#
51# Normally, we echo the whole command before executing it. By making
52# that echo $($(quiet)$(cmd)), we now have the possibility to set
53# $(quiet) to choose other forms of output instead, e.g.
54#
55# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
57#
58# If $(quiet) is empty, the whole command will be printed.
59# If it is set to "quiet_", only the short version will be printed.
60# If it is set to "silent_", nothing will be printed at all, since
61# the variable $(silent_cmd_cc_o_c) doesn't exist.
62#
63# A simple variant is to prefix commands with $(Q) - that's useful
64# for commands that shall be hidden in non-verbose mode.
65#
66# $(Q)ln $@ :<
67#
68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
70#
71# To put more focus on warnings, be less verbose as default
72# Use 'make V=1' to see the full commands
73
74ifeq ("$(origin V)", "command line")
75 KBUILD_VERBOSE = $(V)
76endif
77ifndef KBUILD_VERBOSE
78 KBUILD_VERBOSE = 0
79endif
80
81ifeq ($(KBUILD_VERBOSE),1)
82 quiet =
83 Q =
84else
85 quiet=quiet_
86 Q = @
87endif
88
89# If the user is running make -s (silent mode), suppress echoing of
90# commands
91
92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
93 quiet=silent_
94 tools_silent=s
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is not intended to be used by the regular user (for now),
115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124# Cancel implicit rules on top Makefile
125$(CURDIR)/Makefile Makefile: ;
126
127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128 $(error main directory cannot contain spaces nor colons)
129endif
130
131ifneq ($(KBUILD_OUTPUT),)
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135 && pwd)
136$(if $(KBUILD_OUTPUT),, \
137 $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142 @:
143
144# Invoke a second make in the output directory, passing relevant variables
145sub-make:
146 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/dev-tools/sparse.rst" for more details,
170# including where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173 KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176 KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183 KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187 KBUILD_EXTMOD := $(M)
188endif
189
190ifeq ($(KBUILD_SRC),)
191 # building in the source tree
192 srctree := .
193else
194 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
195 # building in a subdirectory of the source tree
196 srctree := ..
197 else
198 srctree := $(KBUILD_SRC)
199 endif
200endif
201
202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
203
204objtree := .
205src := $(srctree)
206obj := $(objtree)
207
208VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
209
210export srctree objtree VPATH
211
212# To make sure we do not include .config for any of the *config targets
213# catch them early, and hand them over to scripts/kconfig/Makefile
214# It is allowed to specify more targets when calling make, including
215# mixing *config targets and build targets.
216# For example 'make oldconfig all'.
217# Detect when mixed targets is specified, and make a second invocation
218# of make so .config is not included in this case either (for *config).
219
220version_h := include/generated/uapi/linux/version.h
221old_version_h := include/linux/version.h
222
223no-dot-config-targets := clean mrproper distclean \
224 cscope gtags TAGS tags help% %docs check% coccicheck \
225 $(version_h) headers_% archheaders archscripts \
226 kernelversion %src-pkg
227
228config-targets := 0
229mixed-targets := 0
230dot-config := 1
231
232ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
233 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
234 dot-config := 0
235 endif
236endif
237
238ifeq ($(KBUILD_EXTMOD),)
239 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
240 config-targets := 1
241 ifneq ($(words $(MAKECMDGOALS)),1)
242 mixed-targets := 1
243 endif
244 endif
245endif
246# install and modules_install need also be processed one by one
247ifneq ($(filter install,$(MAKECMDGOALS)),)
248 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
249 mixed-targets := 1
250 endif
251endif
252
253ifeq ($(mixed-targets),1)
254# ===========================================================================
255# We're called with mixed targets (*config and build targets).
256# Handle them one by one.
257
258PHONY += $(MAKECMDGOALS) __build_one_by_one
259
260$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
261 @:
262
263__build_one_by_one:
264 $(Q)set -e; \
265 for i in $(MAKECMDGOALS); do \
266 $(MAKE) -f $(srctree)/Makefile $$i; \
267 done
268
269else
270
271# We need some generic definitions (do not try to remake the file).
272scripts/Kbuild.include: ;
273include scripts/Kbuild.include
274
275# Read KERNELRELEASE from include/config/kernel.release (if it exists)
276KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
277KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
278export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
279
280# SUBARCH tells the usermode build what the underlying arch is. That is set
281# first, and if a usermode build is happening, the "ARCH=um" on the command
282# line overrides the setting of ARCH below. If a native build is happening,
283# then ARCH is assigned, getting whatever value it gets normally, and
284# SUBARCH is subsequently ignored.
285
286SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
287 -e s/sun4u/sparc64/ \
288 -e s/arm.*/arm/ -e s/sa110/arm/ \
289 -e s/s390x/s390/ -e s/parisc64/parisc/ \
290 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
291 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
292 -e s/riscv.*/riscv/)
293
294# Cross compiling and selecting different set of gcc/bin-utils
295# ---------------------------------------------------------------------------
296#
297# When performing cross compilation for other architectures ARCH shall be set
298# to the target architecture. (See arch/* for the possibilities).
299# ARCH can be set during invocation of make:
300# make ARCH=ia64
301# Another way is to have ARCH set in the environment.
302# The default ARCH is the host where make is executed.
303
304# CROSS_COMPILE specify the prefix used for all executables used
305# during compilation. Only gcc and related bin-utils executables
306# are prefixed with $(CROSS_COMPILE).
307# CROSS_COMPILE can be set on the command line
308# make CROSS_COMPILE=ia64-linux-
309# Alternatively CROSS_COMPILE can be set in the environment.
310# A third alternative is to store a setting in .config so that plain
311# "make" in the configured kernel build directory always uses that.
312# Default value for CROSS_COMPILE is not to prefix executables
313# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
314ARCH ?= $(SUBARCH)
315CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
316
317# Architecture as present in compile.h
318UTS_MACHINE := $(ARCH)
319SRCARCH := $(ARCH)
320
321# Additional ARCH settings for x86
322ifeq ($(ARCH),i386)
323 SRCARCH := x86
324endif
325ifeq ($(ARCH),x86_64)
326 SRCARCH := x86
327endif
328
329# Additional ARCH settings for sparc
330ifeq ($(ARCH),sparc32)
331 SRCARCH := sparc
332endif
333ifeq ($(ARCH),sparc64)
334 SRCARCH := sparc
335endif
336
337# Additional ARCH settings for sh
338ifeq ($(ARCH),sh64)
339 SRCARCH := sh
340endif
341
342# Additional ARCH settings for tile
343ifeq ($(ARCH),tilepro)
344 SRCARCH := tile
345endif
346ifeq ($(ARCH),tilegx)
347 SRCARCH := tile
348endif
349
350KCONFIG_CONFIG ?= .config
351export KCONFIG_CONFIG
352
353# SHELL used by kbuild
354CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
355 else if [ -x /bin/bash ]; then echo /bin/bash; \
356 else echo sh; fi ; fi)
357
358HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
359HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
360HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
361
362HOSTCC = gcc
363HOSTCXX = g++
364HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
365 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
366HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
367HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
368HOST_LOADLIBES := $(HOST_LFS_LIBS)
369
370# Make variables (CC, etc...)
371AS = $(CROSS_COMPILE)as
372LD = $(CROSS_COMPILE)ld
373CC = $(CROSS_COMPILE)gcc
374CPP = $(CC) -E
375AR = $(CROSS_COMPILE)ar
376NM = $(CROSS_COMPILE)nm
377STRIP = $(CROSS_COMPILE)strip
378OBJCOPY = $(CROSS_COMPILE)objcopy
379OBJDUMP = $(CROSS_COMPILE)objdump
380LEX = flex
381YACC = bison
382AWK = awk
383GENKSYMS = scripts/genksyms/genksyms
384INSTALLKERNEL := installkernel
385DEPMOD = /sbin/depmod
386PERL = perl
387PYTHON = python
388CHECK = sparse
389
390CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
391 -Wbitwise -Wno-return-void $(CF)
392NOSTDINC_FLAGS =
393CFLAGS_MODULE =
394AFLAGS_MODULE =
395LDFLAGS_MODULE =
396CFLAGS_KERNEL =
397AFLAGS_KERNEL =
398LDFLAGS_vmlinux =
399
400# Use USERINCLUDE when you must reference the UAPI directories only.
401USERINCLUDE := \
402 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
403 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
404 -I$(srctree)/include/uapi \
405 -I$(objtree)/include/generated/uapi \
406 -include $(srctree)/include/linux/kconfig.h
407
408# Use LINUXINCLUDE when you must reference the include/ directory.
409# Needed to be compatible with the O= option
410LINUXINCLUDE := \
411 -I$(srctree)/arch/$(SRCARCH)/include \
412 -I$(objtree)/arch/$(SRCARCH)/include/generated \
413 $(if $(KBUILD_SRC), -I$(srctree)/include) \
414 -I$(objtree)/include \
415 $(USERINCLUDE)
416
417KBUILD_AFLAGS := -D__ASSEMBLY__
418KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
419 -fno-strict-aliasing -fno-common -fshort-wchar \
420 -Werror-implicit-function-declaration \
421 -Wno-format-security \
422 -std=gnu89
423KBUILD_CPPFLAGS := -D__KERNEL__
424KBUILD_AFLAGS_KERNEL :=
425KBUILD_CFLAGS_KERNEL :=
426KBUILD_AFLAGS_MODULE := -DMODULE
427KBUILD_CFLAGS_MODULE := -DMODULE
428KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
429GCC_PLUGINS_CFLAGS :=
430
431export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
432export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
433export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
434export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
435
436export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
437export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
438export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
439export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
440export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
441export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
442export KBUILD_ARFLAGS
443
444# When compiling out-of-tree modules, put MODVERDIR in the module
445# tree rather than in the kernel tree. The kernel tree might
446# even be read-only.
447export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
448
449# Files to ignore in find ... statements
450
451export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
452 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
453 -prune -o
454export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
455 --exclude CVS --exclude .pc --exclude .hg --exclude .git
456
457# ===========================================================================
458# Rules shared between *config targets and build targets
459
460# Basic helpers built in scripts/basic/
461PHONY += scripts_basic
462scripts_basic:
463 $(Q)$(MAKE) $(build)=scripts/basic
464 $(Q)rm -f .tmp_quiet_recordmcount
465
466# To avoid any implicit rule to kick in, define an empty command.
467scripts/basic/%: scripts_basic ;
468
469PHONY += outputmakefile
470# outputmakefile generates a Makefile in the output directory, if using a
471# separate output directory. This allows convenient use of make in the
472# output directory.
473outputmakefile:
474ifneq ($(KBUILD_SRC),)
475 $(Q)ln -fsn $(srctree) source
476 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
477 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
478endif
479
480ifeq ($(cc-name),clang)
481ifneq ($(CROSS_COMPILE),)
482CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
483GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
484endif
485ifneq ($(GCC_TOOLCHAIN),)
486CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
487endif
488KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
489KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
490endif
491
492ifeq ($(config-targets),1)
493# ===========================================================================
494# *config targets only - make sure prerequisites are updated, and descend
495# in scripts/kconfig to make the *config target
496
497# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
498# KBUILD_DEFCONFIG may point out an alternative default configuration
499# used for 'make defconfig'
500include arch/$(SRCARCH)/Makefile
501export KBUILD_DEFCONFIG KBUILD_KCONFIG
502
503config: scripts_basic outputmakefile FORCE
504 $(Q)$(MAKE) $(build)=scripts/kconfig $@
505
506%config: scripts_basic outputmakefile FORCE
507 $(Q)$(MAKE) $(build)=scripts/kconfig $@
508
509else
510# ===========================================================================
511# Build targets only - this includes vmlinux, arch specific targets, clean
512# targets and others. In general all targets except *config targets.
513
514# If building an external module we do not care about the all: rule
515# but instead _all depend on modules
516PHONY += all
517ifeq ($(KBUILD_EXTMOD),)
518_all: all
519else
520_all: modules
521endif
522
523# Decide whether to build built-in, modular, or both.
524# Normally, just do built-in.
525
526KBUILD_MODULES :=
527KBUILD_BUILTIN := 1
528
529# If we have only "make modules", don't compile built-in objects.
530# When we're building modules with modversions, we need to consider
531# the built-in objects during the descend as well, in order to
532# make sure the checksums are up to date before we record them.
533
534ifeq ($(MAKECMDGOALS),modules)
535 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
536endif
537
538# If we have "make <whatever> modules", compile modules
539# in addition to whatever we do anyway.
540# Just "make" or "make all" shall build modules as well
541
542ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
543 KBUILD_MODULES := 1
544endif
545
546ifeq ($(MAKECMDGOALS),)
547 KBUILD_MODULES := 1
548endif
549
550export KBUILD_MODULES KBUILD_BUILTIN
551
552ifeq ($(KBUILD_EXTMOD),)
553# Additional helpers built in scripts/
554# Carefully list dependencies so we do not try to build scripts twice
555# in parallel
556PHONY += scripts
557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
558 asm-generic gcc-plugins
559 $(Q)$(MAKE) $(build)=$(@)
560
561# Objects we will link into vmlinux / subdirs we need to visit
562init-y := init/
563drivers-y := drivers/ sound/ firmware/
564net-y := net/
565libs-y := lib/
566core-y := usr/
567virt-y := virt/
568endif # KBUILD_EXTMOD
569
570ifeq ($(dot-config),1)
571# Read in config
572-include include/config/auto.conf
573
574ifeq ($(KBUILD_EXTMOD),)
575# Read in dependencies to all Kconfig* files, make sure to run
576# oldconfig if changes are detected.
577-include include/config/auto.conf.cmd
578
579# To avoid any implicit rule to kick in, define an empty command
580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
581
582# The actual configuration files used during the build are stored in
583# include/generated/ and include/config/. Update them if .config is newer than
584# include/config/auto.conf (which mirrors .config).
585include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
586 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
587else
588# external modules needs include/generated/autoconf.h and include/config/auto.conf
589# but do not care if they are up-to-date. Use auto.conf to trigger the test
590PHONY += include/config/auto.conf
591
592include/config/auto.conf:
593 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
594 echo >&2; \
595 echo >&2 " ERROR: Kernel configuration is invalid."; \
596 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
597 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
598 echo >&2 ; \
599 /bin/false)
600
601endif # KBUILD_EXTMOD
602
603else
604# Dummy target needed, because used as prerequisite
605include/config/auto.conf: ;
606endif # $(dot-config)
607
608# For the kernel to actually contain only the needed exported symbols,
609# we have to build modules as well to determine what those symbols are.
610# (this can be evaluated only once include/config/auto.conf has been included)
611ifdef CONFIG_TRIM_UNUSED_KSYMS
612 KBUILD_MODULES := 1
613endif
614
615# The all: target is the default when no target is given on the
616# command line.
617# This allow a user to issue only 'make' to build a kernel including modules
618# Defaults to vmlinux, but the arch makefile usually adds further targets
619all: vmlinux
620
621KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
622KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
623CFLAGS_GCOV := -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
624export CFLAGS_GCOV CFLAGS_KCOV
625
626# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
627# values of the respective KBUILD_* variables
628ARCH_CPPFLAGS :=
629ARCH_AFLAGS :=
630ARCH_CFLAGS :=
631include arch/$(SRCARCH)/Makefile
632
633KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
634KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
635KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
636KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
637KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
638
639ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
640KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
641KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
642else
643ifdef CONFIG_PROFILE_ALL_BRANCHES
644KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
645else
646KBUILD_CFLAGS += -O2
647endif
648endif
649
650KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
651 $(call cc-disable-warning,maybe-uninitialized,))
652
653# Tell gcc to never replace conditional load with a non-conditional one
654KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
655
656# check for 'asm goto'
657ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
658 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
659 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
660endif
661
662include scripts/Makefile.kcov
663include scripts/Makefile.gcc-plugins
664
665ifdef CONFIG_READABLE_ASM
666# Disable optimizations that make assembler listings hard to read.
667# reorder blocks reorders the control in the function
668# ipa clone creates specialized cloned functions
669# partial inlining inlines only parts of functions
670KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
671 $(call cc-option,-fno-ipa-cp-clone,) \
672 $(call cc-option,-fno-partial-inlining)
673endif
674
675ifneq ($(CONFIG_FRAME_WARN),0)
676KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
677endif
678
679# This selects the stack protector compiler flag. Testing it is delayed
680# until after .config has been reprocessed, in the prepare-compiler-check
681# target.
682ifdef CONFIG_CC_STACKPROTECTOR_AUTO
683 stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
684 stackp-name := AUTO
685else
686ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
687 stackp-flag := -fstack-protector
688 stackp-name := REGULAR
689else
690ifdef CONFIG_CC_STACKPROTECTOR_STRONG
691 stackp-flag := -fstack-protector-strong
692 stackp-name := STRONG
693else
694 # If either there is no stack protector for this architecture or
695 # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
696 # is empty, skipping all remaining stack protector tests.
697 #
698 # Force off for distro compilers that enable stack protector by default.
699 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
700endif
701endif
702endif
703# Find arch-specific stack protector compiler sanity-checking script.
704ifdef stackp-name
705ifneq ($(stackp-flag),)
706 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
707 stackp-check := $(wildcard $(stackp-path))
708 # If the wildcard test matches a test script, run it to check functionality.
709 ifdef stackp-check
710 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
711 stackp-broken := y
712 endif
713 endif
714 ifndef stackp-broken
715 # If the stack protector is functional, enable code that depends on it.
716 KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
717 # Either we've already detected the flag (for AUTO) or we'll fail the
718 # build in the prepare-compiler-check rule (for specific flag).
719 KBUILD_CFLAGS += $(stackp-flag)
720 else
721 # We have to make sure stack protector is unconditionally disabled if
722 # the compiler is broken (in case we're going to continue the build in
723 # AUTO mode).
724 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
725 endif
726endif
727endif
728
729ifeq ($(cc-name),clang)
730KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
731KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
732KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
733KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
734# Quiet clang warning: comparison of unsigned expression < 0 is always false
735KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
736# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
737# source of a reference will be _MergedGlobals and not on of the whitelisted names.
738# See modpost pattern 2
739KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
740KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
741KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
742KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
743else
744
745# These warnings generated too much noise in a regular build.
746# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
747KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
748endif
749
750KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
751ifdef CONFIG_FRAME_POINTER
752KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
753else
754# Some targets (ARM with Thumb2, for example), can't be built with frame
755# pointers. For those, we don't have FUNCTION_TRACER automatically
756# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
757# incompatible with -fomit-frame-pointer with current GCC, so we don't use
758# -fomit-frame-pointer with FUNCTION_TRACER.
759ifndef CONFIG_FUNCTION_TRACER
760KBUILD_CFLAGS += -fomit-frame-pointer
761endif
762endif
763
764KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
765
766ifdef CONFIG_DEBUG_INFO
767ifdef CONFIG_DEBUG_INFO_SPLIT
768KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
769else
770KBUILD_CFLAGS += -g
771endif
772KBUILD_AFLAGS += -Wa,-gdwarf-2
773endif
774ifdef CONFIG_DEBUG_INFO_DWARF4
775KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
776endif
777
778ifdef CONFIG_DEBUG_INFO_REDUCED
779KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
780 $(call cc-option,-fno-var-tracking)
781endif
782
783ifdef CONFIG_FUNCTION_TRACER
784ifndef CC_FLAGS_FTRACE
785CC_FLAGS_FTRACE := -pg
786endif
787export CC_FLAGS_FTRACE
788ifdef CONFIG_HAVE_FENTRY
789CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
790endif
791KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
792KBUILD_AFLAGS += $(CC_USING_FENTRY)
793ifdef CONFIG_DYNAMIC_FTRACE
794 ifdef CONFIG_HAVE_C_RECORDMCOUNT
795 BUILD_C_RECORDMCOUNT := y
796 export BUILD_C_RECORDMCOUNT
797 endif
798endif
799endif
800
801# We trigger additional mismatches with less inlining
802ifdef CONFIG_DEBUG_SECTION_MISMATCH
803KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
804endif
805
806ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
807KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
808KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
809endif
810
811# arch Makefile may override CC so keep this after arch Makefile is included
812NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
813CHECKFLAGS += $(NOSTDINC_FLAGS)
814
815# warn about C99 declaration after statement
816KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
817
818# disable pointer signed / unsigned warnings in gcc 4.0
819KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
820
821# disable invalid "can't wrap" optimizations for signed / pointers
822KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
823
824# Make sure -fstack-check isn't enabled (like gentoo apparently did)
825KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
826
827# conserve stack if available
828KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
829
830# disallow errors like 'EXPORT_GPL(foo);' with missing header
831KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
832
833# require functions to have arguments in prototypes, not empty 'int foo()'
834KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
835
836# Prohibit date/time macros, which would make the build non-deterministic
837KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
838
839# enforce correct pointer usage
840KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
841
842# Require designated initializers for all marked structures
843KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
844
845# use the deterministic mode of AR if available
846KBUILD_ARFLAGS := $(call ar-option,D)
847
848include scripts/Makefile.kasan
849include scripts/Makefile.extrawarn
850include scripts/Makefile.ubsan
851
852# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
853# last assignments
854KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
855KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
856KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
857
858# Use --build-id when available.
859LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
860 $(call cc-ldoption, -Wl$(comma)--build-id,))
861KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
862LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
863
864ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
865LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
866endif
867
868ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
869LDFLAGS_vmlinux += $(call ld-option, -X,)
870endif
871
872# Default kernel image to build when no specific target is given.
873# KBUILD_IMAGE may be overruled on the command line or
874# set in the environment
875# Also any assignments in arch/$(ARCH)/Makefile take precedence over
876# this default value
877export KBUILD_IMAGE ?= vmlinux
878
879#
880# INSTALL_PATH specifies where to place the updated kernel and system map
881# images. Default is /boot, but you can set it to other values
882export INSTALL_PATH ?= /boot
883
884#
885# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
886# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
887# an argument if needed. Otherwise it defaults to the kernel install path
888#
889export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
890
891#
892# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
893# relocations required by build roots. This is not defined in the
894# makefile but the argument can be passed to make if needed.
895#
896
897MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
898export MODLIB
899
900#
901# INSTALL_MOD_STRIP, if defined, will cause modules to be
902# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
903# the default option --strip-debug will be used. Otherwise,
904# INSTALL_MOD_STRIP value will be used as the options to the strip command.
905
906ifdef INSTALL_MOD_STRIP
907ifeq ($(INSTALL_MOD_STRIP),1)
908mod_strip_cmd = $(STRIP) --strip-debug
909else
910mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
911endif # INSTALL_MOD_STRIP=1
912else
913mod_strip_cmd = true
914endif # INSTALL_MOD_STRIP
915export mod_strip_cmd
916
917# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
918# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
919# or CONFIG_MODULE_COMPRESS_XZ.
920
921mod_compress_cmd = true
922ifdef CONFIG_MODULE_COMPRESS
923 ifdef CONFIG_MODULE_COMPRESS_GZIP
924 mod_compress_cmd = gzip -n -f
925 endif # CONFIG_MODULE_COMPRESS_GZIP
926 ifdef CONFIG_MODULE_COMPRESS_XZ
927 mod_compress_cmd = xz -f
928 endif # CONFIG_MODULE_COMPRESS_XZ
929endif # CONFIG_MODULE_COMPRESS
930export mod_compress_cmd
931
932# Select initial ramdisk compression format, default is gzip(1).
933# This shall be used by the dracut(8) tool while creating an initramfs image.
934#
935INITRD_COMPRESS-y := gzip
936INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
937INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
938INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
939INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
940INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
941# do not export INITRD_COMPRESS, since we didn't actually
942# choose a sane default compression above.
943# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
944
945ifdef CONFIG_MODULE_SIG_ALL
946$(eval $(call config_filename,MODULE_SIG_KEY))
947
948mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
949else
950mod_sign_cmd = true
951endif
952export mod_sign_cmd
953
954ifdef CONFIG_STACK_VALIDATION
955 has_libelf := $(call try-run,\
956 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
957 ifeq ($(has_libelf),1)
958 objtool_target := tools/objtool FORCE
959 else
960 ifdef CONFIG_UNWINDER_ORC
961 $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
962 else
963 $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
964 endif
965 SKIP_STACK_VALIDATION := 1
966 export SKIP_STACK_VALIDATION
967 endif
968endif
969
970
971ifeq ($(KBUILD_EXTMOD),)
972core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
973
974vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
975 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
976 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
977
978vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
979 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
980
981init-y := $(patsubst %/, %/built-in.o, $(init-y))
982core-y := $(patsubst %/, %/built-in.o, $(core-y))
983drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
984net-y := $(patsubst %/, %/built-in.o, $(net-y))
985libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
986libs-y2 := $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
987virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
988
989# Externally visible symbols (used by link-vmlinux.sh)
990export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
991export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
992export KBUILD_VMLINUX_LIBS := $(libs-y1)
993export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
994export LDFLAGS_vmlinux
995# used by scripts/package/Makefile
996export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
997
998vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
999
1000# Include targets which we want to execute sequentially if the rest of the
1001# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
1002# evaluated more than once.
1003PHONY += vmlinux_prereq
1004vmlinux_prereq: $(vmlinux-deps) FORCE
1005ifdef CONFIG_HEADERS_CHECK
1006 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1007endif
1008ifdef CONFIG_GDB_SCRIPTS
1009 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1010endif
1011ifdef CONFIG_TRIM_UNUSED_KSYMS
1012 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1013 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1014endif
1015
1016# standalone target for easier testing
1017include/generated/autoksyms.h: FORCE
1018 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
1019
1020ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1021
1022# Final link of vmlinux with optional arch pass after final link
1023cmd_link-vmlinux = \
1024 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
1025 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1026
1027vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1028 +$(call if_changed,link-vmlinux)
1029
1030# Build samples along the rest of the kernel
1031ifdef CONFIG_SAMPLES
1032vmlinux-dirs += samples
1033endif
1034
1035# The actual objects are generated when descending,
1036# make sure no implicit rule kicks in
1037$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1038
1039# Handle descending into subdirectories listed in $(vmlinux-dirs)
1040# Preset locale variables to speed up the build process. Limit locale
1041# tweaks to this spot to avoid wrong language settings when running
1042# make menuconfig etc.
1043# Error messages still appears in the original language
1044
1045PHONY += $(vmlinux-dirs)
1046$(vmlinux-dirs): prepare scripts
1047 $(Q)$(MAKE) $(build)=$@ need-builtin=1
1048
1049define filechk_kernel.release
1050 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1051endef
1052
1053# Store (new) KERNELRELEASE string in include/config/kernel.release
1054include/config/kernel.release: include/config/auto.conf FORCE
1055 $(call filechk,kernel.release)
1056
1057
1058# Things we need to do before we recursively start building the kernel
1059# or the modules are listed in "prepare".
1060# A multi level approach is used. prepareN is processed before prepareN-1.
1061# archprepare is used in arch Makefiles and when processed asm symlink,
1062# version.h and scripts_basic is processed / created.
1063
1064# Listed in dependency order
1065PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1066
1067# prepare3 is used to check if we are building in a separate output directory,
1068# and if so do:
1069# 1) Check that make has not been executed in the kernel src $(srctree)
1070prepare3: include/config/kernel.release
1071ifneq ($(KBUILD_SRC),)
1072 @$(kecho) ' Using $(srctree) as source for kernel'
1073 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1074 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1075 echo >&2 " in the '$(srctree)' directory.";\
1076 /bin/false; \
1077 fi;
1078endif
1079
1080# prepare2 creates a makefile if using a separate output directory.
1081# From this point forward, .config has been reprocessed, so any rules
1082# that need to depend on updated CONFIG_* values can be checked here.
1083prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1084
1085prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1086 include/config/auto.conf
1087 $(cmd_crmodverdir)
1088
1089archprepare: archheaders archscripts prepare1 scripts_basic
1090
1091prepare0: archprepare gcc-plugins
1092 $(Q)$(MAKE) $(build)=.
1093
1094# All the preparing..
1095prepare: prepare0 prepare-objtool
1096
1097# Support for using generic headers in asm-generic
1098PHONY += asm-generic uapi-asm-generic
1099asm-generic: uapi-asm-generic
1100 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1101 src=asm obj=arch/$(SRCARCH)/include/generated/asm
1102uapi-asm-generic:
1103 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1104 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1105
1106PHONY += prepare-objtool
1107prepare-objtool: $(objtool_target)
1108
1109# Check for CONFIG flags that require compiler support. Abort the build
1110# after .config has been processed, but before the kernel build starts.
1111#
1112# For security-sensitive CONFIG options, we don't want to fallback and/or
1113# silently change which compiler flags will be used, since that leads to
1114# producing kernels with different security feature characteristics
1115# depending on the compiler used. (For example, "But I selected
1116# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1117PHONY += prepare-compiler-check
1118prepare-compiler-check: FORCE
1119# Make sure compiler supports requested stack protector flag.
1120ifdef stackp-name
1121 # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
1122 ifeq ($(stackp-flag),)
1123 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1124 Compiler does not support any known stack-protector >&2
1125 else
1126 # Fail if specifically requested stack protector is missing.
1127 ifeq ($(call cc-option, $(stackp-flag)),)
1128 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1129 $(stackp-flag) not supported by compiler >&2 && exit 1
1130 endif
1131 endif
1132endif
1133# Make sure compiler does not have buggy stack-protector support. If a
1134# specific stack-protector was requested, fail the build, otherwise warn.
1135ifdef stackp-broken
1136 ifeq ($(stackp-name),AUTO)
1137 @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1138 $(stackp-flag) available but compiler is broken: disabling >&2
1139 else
1140 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1141 $(stackp-flag) available but compiler is broken >&2 && exit 1
1142 endif
1143endif
1144 @:
1145
1146# Generate some files
1147# ---------------------------------------------------------------------------
1148
1149# KERNELRELEASE can change from a few different places, meaning version.h
1150# needs to be updated, so this check is forced on all builds
1151
1152uts_len := 64
1153define filechk_utsrelease.h
1154 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1155 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1156 exit 1; \
1157 fi; \
1158 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1159endef
1160
1161define filechk_version.h
1162 (echo \#define LINUX_VERSION_CODE $(shell \
1163 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1164 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1165endef
1166
1167$(version_h): $(srctree)/Makefile FORCE
1168 $(call filechk,version.h)
1169 $(Q)rm -f $(old_version_h)
1170
1171include/generated/utsrelease.h: include/config/kernel.release FORCE
1172 $(call filechk,utsrelease.h)
1173
1174PHONY += headerdep
1175headerdep:
1176 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1177 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1178
1179# ---------------------------------------------------------------------------
1180# Kernel headers
1181
1182#Default location for installed headers
1183export INSTALL_HDR_PATH = $(objtree)/usr
1184
1185# If we do an all arch process set dst to include/arch-$(SRCARCH)
1186hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1187
1188PHONY += archheaders
1189archheaders:
1190
1191PHONY += archscripts
1192archscripts:
1193
1194PHONY += __headers
1195__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1196 $(Q)$(MAKE) $(build)=scripts build_unifdef
1197
1198PHONY += headers_install_all
1199headers_install_all:
1200 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1201
1202PHONY += headers_install
1203headers_install: __headers
1204 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1205 $(error Headers not exportable for the $(SRCARCH) architecture))
1206 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1207 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1208
1209PHONY += headers_check_all
1210headers_check_all: headers_install_all
1211 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1212
1213PHONY += headers_check
1214headers_check: headers_install
1215 $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1216 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1217
1218# ---------------------------------------------------------------------------
1219# Kernel selftest
1220
1221PHONY += kselftest
1222kselftest:
1223 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1224
1225PHONY += kselftest-clean
1226kselftest-clean:
1227 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1228
1229PHONY += kselftest-merge
1230kselftest-merge:
1231 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1232 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1233 -m $(objtree)/.config \
1234 $(srctree)/tools/testing/selftests/*/config
1235 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1236
1237# ---------------------------------------------------------------------------
1238# Modules
1239
1240ifdef CONFIG_MODULES
1241
1242# By default, build modules as well
1243
1244all: modules
1245
1246# Build modules
1247#
1248# A module can be listed more than once in obj-m resulting in
1249# duplicate lines in modules.order files. Those are removed
1250# using awk while concatenating to the final file.
1251
1252PHONY += modules
1253modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1254 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1255 @$(kecho) ' Building modules, stage 2.';
1256 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1257
1258modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1259 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1260
1261%/modules.builtin: include/config/auto.conf
1262 $(Q)$(MAKE) $(modbuiltin)=$*
1263
1264
1265# Target to prepare building external modules
1266PHONY += modules_prepare
1267modules_prepare: prepare scripts
1268
1269# Target to install modules
1270PHONY += modules_install
1271modules_install: _modinst_ _modinst_post
1272
1273PHONY += _modinst_
1274_modinst_:
1275 @rm -rf $(MODLIB)/kernel
1276 @rm -f $(MODLIB)/source
1277 @mkdir -p $(MODLIB)/kernel
1278 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1279 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1280 rm -f $(MODLIB)/build ; \
1281 ln -s $(CURDIR) $(MODLIB)/build ; \
1282 fi
1283 @cp -f $(objtree)/modules.order $(MODLIB)/
1284 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1285 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1286
1287# This depmod is only for convenience to give the initial
1288# boot a modules.dep even before / is mounted read-write. However the
1289# boot script depmod is the master version.
1290PHONY += _modinst_post
1291_modinst_post: _modinst_
1292 $(call cmd,depmod)
1293
1294ifeq ($(CONFIG_MODULE_SIG), y)
1295PHONY += modules_sign
1296modules_sign:
1297 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1298endif
1299
1300else # CONFIG_MODULES
1301
1302# Modules not configured
1303# ---------------------------------------------------------------------------
1304
1305PHONY += modules modules_install
1306modules modules_install:
1307 @echo >&2
1308 @echo >&2 "The present kernel configuration has modules disabled."
1309 @echo >&2 "Type 'make config' and enable loadable module support."
1310 @echo >&2 "Then build a kernel with module support enabled."
1311 @echo >&2
1312 @exit 1
1313
1314endif # CONFIG_MODULES
1315
1316###
1317# Cleaning is done on three levels.
1318# make clean Delete most generated files
1319# Leave enough to build external modules
1320# make mrproper Delete the current configuration, and all generated files
1321# make distclean Remove editor backup files, patch leftover files and the like
1322
1323# Directories & files removed with 'make clean'
1324CLEAN_DIRS += $(MODVERDIR)
1325
1326# Directories & files removed with 'make mrproper'
1327MRPROPER_DIRS += include/config usr/include include/generated \
1328 arch/*/include/generated .tmp_objdiff
1329MRPROPER_FILES += .config .config.old .version \
1330 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1331 signing_key.pem signing_key.priv signing_key.x509 \
1332 x509.genkey extra_certificates signing_key.x509.keyid \
1333 signing_key.x509.signer vmlinux-gdb.py
1334
1335# clean - Delete most, but leave enough to build external modules
1336#
1337clean: rm-dirs := $(CLEAN_DIRS)
1338clean: rm-files := $(CLEAN_FILES)
1339clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1340
1341PHONY += $(clean-dirs) clean archclean vmlinuxclean
1342$(clean-dirs):
1343 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1344
1345vmlinuxclean:
1346 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1347 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1348
1349clean: archclean vmlinuxclean
1350
1351# mrproper - Delete all generated files, including .config
1352#
1353mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1354mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1355mrproper-dirs := $(addprefix _mrproper_,scripts)
1356
1357PHONY += $(mrproper-dirs) mrproper archmrproper
1358$(mrproper-dirs):
1359 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1360
1361mrproper: clean archmrproper $(mrproper-dirs)
1362 $(call cmd,rmdirs)
1363 $(call cmd,rmfiles)
1364
1365# distclean
1366#
1367PHONY += distclean
1368
1369distclean: mrproper
1370 @find $(srctree) $(RCS_FIND_IGNORE) \
1371 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1372 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1373 -o -name 'core' \) \
1374 -type f -print | xargs rm -f
1375
1376
1377# Packaging of the kernel to various formats
1378# ---------------------------------------------------------------------------
1379# rpm target kept for backward compatibility
1380package-dir := scripts/package
1381
1382%src-pkg: FORCE
1383 $(Q)$(MAKE) $(build)=$(package-dir) $@
1384%pkg: include/config/kernel.release FORCE
1385 $(Q)$(MAKE) $(build)=$(package-dir) $@
1386rpm: rpm-pkg
1387 @echo " WARNING: \"rpm\" target will be removed after Linux 4.18"
1388 @echo " Please use \"rpm-pkg\" instead."
1389
1390
1391# Brief documentation of the typical targets used
1392# ---------------------------------------------------------------------------
1393
1394boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1395boards := $(sort $(notdir $(boards)))
1396board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1397board-dirs := $(sort $(notdir $(board-dirs:/=)))
1398
1399PHONY += help
1400help:
1401 @echo 'Cleaning targets:'
1402 @echo ' clean - Remove most generated files but keep the config and'
1403 @echo ' enough build support to build external modules'
1404 @echo ' mrproper - Remove all generated files + config + various backup files'
1405 @echo ' distclean - mrproper + remove editor backup and patch files'
1406 @echo ''
1407 @echo 'Configuration targets:'
1408 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1409 @echo ''
1410 @echo 'Other generic targets:'
1411 @echo ' all - Build all targets marked with [*]'
1412 @echo '* vmlinux - Build the bare kernel'
1413 @echo '* modules - Build all modules'
1414 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1415 @echo ' dir/ - Build all files in dir and below'
1416 @echo ' dir/file.[ois] - Build specified target only'
1417 @echo ' dir/file.ll - Build the LLVM assembly file'
1418 @echo ' (requires compiler support for LLVM assembly generation)'
1419 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1420 @echo ' (requires a recent binutils and recent build (System.map))'
1421 @echo ' dir/file.ko - Build module including final link'
1422 @echo ' modules_prepare - Set up for building external modules'
1423 @echo ' tags/TAGS - Generate tags file for editors'
1424 @echo ' cscope - Generate cscope index'
1425 @echo ' gtags - Generate GNU GLOBAL index'
1426 @echo ' kernelrelease - Output the release version string (use with make -s)'
1427 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1428 @echo ' image_name - Output the image name (use with make -s)'
1429 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1430 echo ' (default: $(INSTALL_HDR_PATH))'; \
1431 echo ''
1432 @echo 'Static analysers:'
1433 @echo ' checkstack - Generate a list of stack hogs'
1434 @echo ' namespacecheck - Name space analysis on compiled kernel'
1435 @echo ' versioncheck - Sanity check on version.h usage'
1436 @echo ' includecheck - Check for duplicate included header files'
1437 @echo ' export_report - List the usages of all exported symbols'
1438 @echo ' headers_check - Sanity check on exported headers'
1439 @echo ' headerdep - Detect inclusion cycles in headers'
1440 @echo ' coccicheck - Check with Coccinelle'
1441 @echo ''
1442 @echo 'Kernel selftest:'
1443 @echo ' kselftest - Build and run kernel selftest (run as root)'
1444 @echo ' Build, install, and boot kernel before'
1445 @echo ' running kselftest on it'
1446 @echo ' kselftest-clean - Remove all generated kselftest files'
1447 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1448 @echo ' .config.'
1449 @echo ''
1450 @echo 'Userspace tools targets:'
1451 @echo ' use "make tools/help"'
1452 @echo ' or "cd tools; make help"'
1453 @echo ''
1454 @echo 'Kernel packaging:'
1455 @$(MAKE) $(build)=$(package-dir) help
1456 @echo ''
1457 @echo 'Documentation targets:'
1458 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1459 @echo ''
1460 @echo 'Architecture specific targets ($(SRCARCH)):'
1461 @$(if $(archhelp),$(archhelp),\
1462 echo ' No architecture specific help defined for $(SRCARCH)')
1463 @echo ''
1464 @$(if $(boards), \
1465 $(foreach b, $(boards), \
1466 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1467 echo '')
1468 @$(if $(board-dirs), \
1469 $(foreach b, $(board-dirs), \
1470 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1471 printf " %-16s - Show all of the above\\n" help-boards; \
1472 echo '')
1473
1474 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1475 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1476 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1477 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1478 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1479 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1480 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1481 @echo ' 1: warnings which may be relevant and do not occur too often'
1482 @echo ' 2: warnings which occur quite often but may still be relevant'
1483 @echo ' 3: more obscure warnings, can most likely be ignored'
1484 @echo ' Multiple levels can be combined with W=12 or W=123'
1485 @echo ''
1486 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1487 @echo 'For further info see the ./README file'
1488
1489
1490help-board-dirs := $(addprefix help-,$(board-dirs))
1491
1492help-boards: $(help-board-dirs)
1493
1494boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1495
1496$(help-board-dirs): help-%:
1497 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1498 @$(if $(boards-per-dir), \
1499 $(foreach b, $(boards-per-dir), \
1500 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1501 echo '')
1502
1503
1504# Documentation targets
1505# ---------------------------------------------------------------------------
1506DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1507 linkcheckdocs dochelp refcheckdocs
1508PHONY += $(DOC_TARGETS)
1509$(DOC_TARGETS): scripts_basic FORCE
1510 $(Q)$(MAKE) $(build)=Documentation $@
1511
1512else # KBUILD_EXTMOD
1513
1514###
1515# External module support.
1516# When building external modules the kernel used as basis is considered
1517# read-only, and no consistency checks are made and the make
1518# system is not used on the basis kernel. If updates are required
1519# in the basis kernel ordinary make commands (without M=...) must
1520# be used.
1521#
1522# The following are the only valid targets when building external
1523# modules.
1524# make M=dir clean Delete all automatically generated files
1525# make M=dir modules Make all modules in specified dir
1526# make M=dir Same as 'make M=dir modules'
1527# make M=dir modules_install
1528# Install the modules built in the module directory
1529# Assumes install directory is already created
1530
1531# We are always building modules
1532KBUILD_MODULES := 1
1533PHONY += crmodverdir
1534crmodverdir:
1535 $(cmd_crmodverdir)
1536
1537PHONY += $(objtree)/Module.symvers
1538$(objtree)/Module.symvers:
1539 @test -e $(objtree)/Module.symvers || ( \
1540 echo; \
1541 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1542 echo " is missing; modules will have no dependencies and modversions."; \
1543 echo )
1544
1545module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1546PHONY += $(module-dirs) modules
1547$(module-dirs): crmodverdir $(objtree)/Module.symvers
1548 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1549
1550modules: $(module-dirs)
1551 @$(kecho) ' Building modules, stage 2.';
1552 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1553
1554PHONY += modules_install
1555modules_install: _emodinst_ _emodinst_post
1556
1557install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1558PHONY += _emodinst_
1559_emodinst_:
1560 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1561 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1562
1563PHONY += _emodinst_post
1564_emodinst_post: _emodinst_
1565 $(call cmd,depmod)
1566
1567clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1568
1569PHONY += $(clean-dirs) clean
1570$(clean-dirs):
1571 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1572
1573clean: rm-dirs := $(MODVERDIR)
1574clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1575
1576PHONY += help
1577help:
1578 @echo ' Building external modules.'
1579 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1580 @echo ''
1581 @echo ' modules - default target, build the module(s)'
1582 @echo ' modules_install - install the module'
1583 @echo ' clean - remove generated files in module directory only'
1584 @echo ''
1585
1586# Dummies...
1587PHONY += prepare scripts
1588prepare: ;
1589scripts: ;
1590endif # KBUILD_EXTMOD
1591
1592clean: $(clean-dirs)
1593 $(call cmd,rmdirs)
1594 $(call cmd,rmfiles)
1595 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1596 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1597 -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1598 -o -name '*.dwo' -o -name '*.lst' \
1599 -o -name '*.su' \
1600 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1601 -o -name '*.symtypes' -o -name 'modules.order' \
1602 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1603 -o -name .cache.mk \
1604 -o -name '*.c.[012]*.*' \
1605 -o -name '*.ll' \
1606 -o -name '*.gcno' \) -type f -print | xargs rm -f
1607
1608# Generate tags for editors
1609# ---------------------------------------------------------------------------
1610quiet_cmd_tags = GEN $@
1611 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1612
1613tags TAGS cscope gtags: FORCE
1614 $(call cmd,tags)
1615
1616# Scripts to check various things for consistency
1617# ---------------------------------------------------------------------------
1618
1619PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1620
1621includecheck:
1622 find $(srctree)/* $(RCS_FIND_IGNORE) \
1623 -name '*.[hcS]' -type f -print | sort \
1624 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1625
1626versioncheck:
1627 find $(srctree)/* $(RCS_FIND_IGNORE) \
1628 -name '*.[hcS]' -type f -print | sort \
1629 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1630
1631coccicheck:
1632 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1633
1634namespacecheck:
1635 $(PERL) $(srctree)/scripts/namespace.pl
1636
1637export_report:
1638 $(PERL) $(srctree)/scripts/export_report.pl
1639
1640endif #ifeq ($(config-targets),1)
1641endif #ifeq ($(mixed-targets),1)
1642
1643PHONY += checkstack kernelrelease kernelversion image_name
1644
1645# UML needs a little special treatment here. It wants to use the host
1646# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1647# else wants $(ARCH), including people doing cross-builds, which means
1648# that $(SUBARCH) doesn't work here.
1649ifeq ($(ARCH), um)
1650CHECKSTACK_ARCH := $(SUBARCH)
1651else
1652CHECKSTACK_ARCH := $(ARCH)
1653endif
1654checkstack:
1655 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1656 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1657
1658kernelrelease:
1659 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1660
1661kernelversion:
1662 @echo $(KERNELVERSION)
1663
1664image_name:
1665 @echo $(KBUILD_IMAGE)
1666
1667# Clear a bunch of variables before executing the submake
1668tools/: FORCE
1669 $(Q)mkdir -p $(objtree)/tools
1670 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1671
1672tools/%: FORCE
1673 $(Q)mkdir -p $(objtree)/tools
1674 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1675
1676# Single targets
1677# ---------------------------------------------------------------------------
1678# Single targets are compatible with:
1679# - build with mixed source and output
1680# - build with separate output dir 'make O=...'
1681# - external modules
1682#
1683# target-dir => where to store outputfile
1684# build-dir => directory in kernel source tree to use
1685
1686ifeq ($(KBUILD_EXTMOD),)
1687 build-dir = $(patsubst %/,%,$(dir $@))
1688 target-dir = $(dir $@)
1689else
1690 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1691 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1692 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1693endif
1694
1695%.s: %.c prepare scripts FORCE
1696 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1697%.i: %.c prepare scripts FORCE
1698 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1699%.o: %.c prepare scripts FORCE
1700 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1701%.lst: %.c prepare scripts FORCE
1702 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1703%.s: %.S prepare scripts FORCE
1704 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1705%.o: %.S prepare scripts FORCE
1706 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1707%.symtypes: %.c prepare scripts FORCE
1708 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1709%.ll: %.c prepare scripts FORCE
1710 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1711
1712# Modules
1713/: prepare scripts FORCE
1714 $(cmd_crmodverdir)
1715 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1716 $(build)=$(build-dir)
1717# Make sure the latest headers are built for Documentation
1718Documentation/ samples/: headers_install
1719%/: prepare scripts FORCE
1720 $(cmd_crmodverdir)
1721 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1722 $(build)=$(build-dir)
1723%.ko: prepare scripts FORCE
1724 $(cmd_crmodverdir)
1725 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1726 $(build)=$(build-dir) $(@:.ko=.o)
1727 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1728
1729# FIXME Should go into a make.lib or something
1730# ===========================================================================
1731
1732quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1733 cmd_rmdirs = rm -rf $(rm-dirs)
1734
1735quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1736 cmd_rmfiles = rm -f $(rm-files)
1737
1738# Run depmod only if we have System.map and depmod is executable
1739quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1740 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1741 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1742
1743# Create temporary dir for module support files
1744# clean it up only when building all modules
1745cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1746 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1747
1748# read all saved command lines
1749
1750cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1751
1752ifneq ($(cmd_files),)
1753 $(cmd_files): ; # Do not try to update included dependency files
1754 include $(cmd_files)
1755endif
1756
1757endif # skip-makefile
1758
1759PHONY += FORCE
1760FORCE:
1761
1762# Declare the contents of the .PHONY variable as phony. We keep that
1763# information in a variable so we can use it in if_changed and friends.
1764.PHONY: $(PHONY)