xref: /openbmc/linux/Makefile (revision bf070bb0)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 4
3PATCHLEVEL = 14
4SUBLEVEL = 0
5EXTRAVERSION =
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
380AWK		= awk
381GENKSYMS	= scripts/genksyms/genksyms
382INSTALLKERNEL  := installkernel
383DEPMOD		= /sbin/depmod
384PERL		= perl
385PYTHON		= python
386CHECK		= sparse
387
388CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
389		  -Wbitwise -Wno-return-void $(CF)
390NOSTDINC_FLAGS  =
391CFLAGS_MODULE   =
392AFLAGS_MODULE   =
393LDFLAGS_MODULE  =
394CFLAGS_KERNEL	=
395AFLAGS_KERNEL	=
396LDFLAGS_vmlinux =
397
398# Use USERINCLUDE when you must reference the UAPI directories only.
399USERINCLUDE    := \
400		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
401		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
402		-I$(srctree)/include/uapi \
403		-I$(objtree)/include/generated/uapi \
404                -include $(srctree)/include/linux/kconfig.h
405
406# Use LINUXINCLUDE when you must reference the include/ directory.
407# Needed to be compatible with the O= option
408LINUXINCLUDE    := \
409		-I$(srctree)/arch/$(SRCARCH)/include \
410		-I$(objtree)/arch/$(SRCARCH)/include/generated \
411		$(if $(KBUILD_SRC), -I$(srctree)/include) \
412		-I$(objtree)/include \
413		$(USERINCLUDE)
414
415KBUILD_AFLAGS   := -D__ASSEMBLY__
416KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
417		   -fno-strict-aliasing -fno-common -fshort-wchar \
418		   -Werror-implicit-function-declaration \
419		   -Wno-format-security \
420		   -std=gnu89
421KBUILD_CPPFLAGS := -D__KERNEL__
422KBUILD_AFLAGS_KERNEL :=
423KBUILD_CFLAGS_KERNEL :=
424KBUILD_AFLAGS_MODULE  := -DMODULE
425KBUILD_CFLAGS_MODULE  := -DMODULE
426KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
427GCC_PLUGINS_CFLAGS :=
428
429export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
430export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
431export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
432export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
433
434export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
435export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_KASAN CFLAGS_UBSAN
436export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
437export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
438export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
439export KBUILD_ARFLAGS
440
441# When compiling out-of-tree modules, put MODVERDIR in the module
442# tree rather than in the kernel tree. The kernel tree might
443# even be read-only.
444export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
445
446# Files to ignore in find ... statements
447
448export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
449			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
450			  -prune -o
451export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
452			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
453
454# ===========================================================================
455# Rules shared between *config targets and build targets
456
457# Basic helpers built in scripts/basic/
458PHONY += scripts_basic
459scripts_basic:
460	$(Q)$(MAKE) $(build)=scripts/basic
461	$(Q)rm -f .tmp_quiet_recordmcount
462
463# To avoid any implicit rule to kick in, define an empty command.
464scripts/basic/%: scripts_basic ;
465
466PHONY += outputmakefile
467# outputmakefile generates a Makefile in the output directory, if using a
468# separate output directory. This allows convenient use of make in the
469# output directory.
470outputmakefile:
471ifneq ($(KBUILD_SRC),)
472	$(Q)ln -fsn $(srctree) source
473	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
474	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
475endif
476
477ifeq ($(config-targets),1)
478# ===========================================================================
479# *config targets only - make sure prerequisites are updated, and descend
480# in scripts/kconfig to make the *config target
481
482# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
483# KBUILD_DEFCONFIG may point out an alternative default configuration
484# used for 'make defconfig'
485include arch/$(SRCARCH)/Makefile
486export KBUILD_DEFCONFIG KBUILD_KCONFIG
487
488config: scripts_basic outputmakefile FORCE
489	$(Q)$(MAKE) $(build)=scripts/kconfig $@
490
491%config: scripts_basic outputmakefile FORCE
492	$(Q)$(MAKE) $(build)=scripts/kconfig $@
493
494else
495# ===========================================================================
496# Build targets only - this includes vmlinux, arch specific targets, clean
497# targets and others. In general all targets except *config targets.
498
499# If building an external module we do not care about the all: rule
500# but instead _all depend on modules
501PHONY += all
502ifeq ($(KBUILD_EXTMOD),)
503_all: all
504else
505_all: modules
506endif
507
508# Decide whether to build built-in, modular, or both.
509# Normally, just do built-in.
510
511KBUILD_MODULES :=
512KBUILD_BUILTIN := 1
513
514# If we have only "make modules", don't compile built-in objects.
515# When we're building modules with modversions, we need to consider
516# the built-in objects during the descend as well, in order to
517# make sure the checksums are up to date before we record them.
518
519ifeq ($(MAKECMDGOALS),modules)
520  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
521endif
522
523# If we have "make <whatever> modules", compile modules
524# in addition to whatever we do anyway.
525# Just "make" or "make all" shall build modules as well
526
527ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
528  KBUILD_MODULES := 1
529endif
530
531ifeq ($(MAKECMDGOALS),)
532  KBUILD_MODULES := 1
533endif
534
535export KBUILD_MODULES KBUILD_BUILTIN
536
537ifeq ($(KBUILD_EXTMOD),)
538# Additional helpers built in scripts/
539# Carefully list dependencies so we do not try to build scripts twice
540# in parallel
541PHONY += scripts
542scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
543	 asm-generic gcc-plugins
544	$(Q)$(MAKE) $(build)=$(@)
545
546# Objects we will link into vmlinux / subdirs we need to visit
547init-y		:= init/
548drivers-y	:= drivers/ sound/ firmware/
549net-y		:= net/
550libs-y		:= lib/
551core-y		:= usr/
552virt-y		:= virt/
553endif # KBUILD_EXTMOD
554
555ifeq ($(dot-config),1)
556# Read in config
557-include include/config/auto.conf
558
559ifeq ($(KBUILD_EXTMOD),)
560# Read in dependencies to all Kconfig* files, make sure to run
561# oldconfig if changes are detected.
562-include include/config/auto.conf.cmd
563
564# To avoid any implicit rule to kick in, define an empty command
565$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
566
567# If .config is newer than include/config/auto.conf, someone tinkered
568# with it and forgot to run make oldconfig.
569# if auto.conf.cmd is missing then we are probably in a cleaned tree so
570# we execute the config step to be sure to catch updated Kconfig files
571include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
572	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
573else
574# external modules needs include/generated/autoconf.h and include/config/auto.conf
575# but do not care if they are up-to-date. Use auto.conf to trigger the test
576PHONY += include/config/auto.conf
577
578include/config/auto.conf:
579	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
580	echo >&2;							\
581	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
582	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
583	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
584	echo >&2 ;							\
585	/bin/false)
586
587endif # KBUILD_EXTMOD
588
589else
590# Dummy target needed, because used as prerequisite
591include/config/auto.conf: ;
592endif # $(dot-config)
593
594# For the kernel to actually contain only the needed exported symbols,
595# we have to build modules as well to determine what those symbols are.
596# (this can be evaluated only once include/config/auto.conf has been included)
597ifdef CONFIG_TRIM_UNUSED_KSYMS
598  KBUILD_MODULES := 1
599endif
600
601# The all: target is the default when no target is given on the
602# command line.
603# This allow a user to issue only 'make' to build a kernel including modules
604# Defaults to vmlinux, but the arch makefile usually adds further targets
605all: vmlinux
606
607KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
608KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
609CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage -fno-tree-loop-im $(call cc-disable-warning,maybe-uninitialized,)
610export CFLAGS_GCOV CFLAGS_KCOV
611
612# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
613# values of the respective KBUILD_* variables
614ARCH_CPPFLAGS :=
615ARCH_AFLAGS :=
616ARCH_CFLAGS :=
617include arch/$(SRCARCH)/Makefile
618
619KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
620KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
621KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
622KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
623KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
624
625ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
626KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
627KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
628else
629ifdef CONFIG_PROFILE_ALL_BRANCHES
630KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
631else
632KBUILD_CFLAGS   += -O2
633endif
634endif
635
636KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
637			$(call cc-disable-warning,maybe-uninitialized,))
638
639# Tell gcc to never replace conditional load with a non-conditional one
640KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
641
642# check for 'asm goto'
643ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
644	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
645	KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
646endif
647
648include scripts/Makefile.kcov
649include scripts/Makefile.gcc-plugins
650
651ifdef CONFIG_READABLE_ASM
652# Disable optimizations that make assembler listings hard to read.
653# reorder blocks reorders the control in the function
654# ipa clone creates specialized cloned functions
655# partial inlining inlines only parts of functions
656KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
657                 $(call cc-option,-fno-ipa-cp-clone,) \
658                 $(call cc-option,-fno-partial-inlining)
659endif
660
661ifneq ($(CONFIG_FRAME_WARN),0)
662KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
663endif
664
665# This selects the stack protector compiler flag. Testing it is delayed
666# until after .config has been reprocessed, in the prepare-compiler-check
667# target.
668ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
669  stackp-flag := -fstack-protector
670  stackp-name := REGULAR
671else
672ifdef CONFIG_CC_STACKPROTECTOR_STRONG
673  stackp-flag := -fstack-protector-strong
674  stackp-name := STRONG
675else
676  # Force off for distro compilers that enable stack protector by default.
677  stackp-flag := $(call cc-option, -fno-stack-protector)
678endif
679endif
680# Find arch-specific stack protector compiler sanity-checking script.
681ifdef CONFIG_CC_STACKPROTECTOR
682  stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
683  stackp-check := $(wildcard $(stackp-path))
684endif
685KBUILD_CFLAGS += $(stackp-flag)
686
687ifeq ($(cc-name),clang)
688ifneq ($(CROSS_COMPILE),)
689CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
690GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
691endif
692ifneq ($(GCC_TOOLCHAIN),)
693CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
694endif
695KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
696KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
697KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
698KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
699KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
700KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
701KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
702# Quiet clang warning: comparison of unsigned expression < 0 is always false
703KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
704# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
705# source of a reference will be _MergedGlobals and not on of the whitelisted names.
706# See modpost pattern 2
707KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
708KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
709KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
710KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
711else
712
713# These warnings generated too much noise in a regular build.
714# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
715KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
716KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
717endif
718
719ifdef CONFIG_FRAME_POINTER
720KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
721else
722# Some targets (ARM with Thumb2, for example), can't be built with frame
723# pointers.  For those, we don't have FUNCTION_TRACER automatically
724# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
725# incompatible with -fomit-frame-pointer with current GCC, so we don't use
726# -fomit-frame-pointer with FUNCTION_TRACER.
727ifndef CONFIG_FUNCTION_TRACER
728KBUILD_CFLAGS	+= -fomit-frame-pointer
729endif
730endif
731
732KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
733
734ifdef CONFIG_DEBUG_INFO
735ifdef CONFIG_DEBUG_INFO_SPLIT
736KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
737else
738KBUILD_CFLAGS	+= -g
739endif
740KBUILD_AFLAGS	+= -Wa,-gdwarf-2
741endif
742ifdef CONFIG_DEBUG_INFO_DWARF4
743KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
744endif
745
746ifdef CONFIG_DEBUG_INFO_REDUCED
747KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
748		   $(call cc-option,-fno-var-tracking)
749endif
750
751ifdef CONFIG_FUNCTION_TRACER
752ifndef CC_FLAGS_FTRACE
753CC_FLAGS_FTRACE := -pg
754endif
755export CC_FLAGS_FTRACE
756ifdef CONFIG_HAVE_FENTRY
757CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
758endif
759KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
760KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
761ifdef CONFIG_DYNAMIC_FTRACE
762	ifdef CONFIG_HAVE_C_RECORDMCOUNT
763		BUILD_C_RECORDMCOUNT := y
764		export BUILD_C_RECORDMCOUNT
765	endif
766endif
767endif
768
769# We trigger additional mismatches with less inlining
770ifdef CONFIG_DEBUG_SECTION_MISMATCH
771KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
772endif
773
774ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
775KBUILD_CFLAGS	+= $(call cc-option,-ffunction-sections,)
776KBUILD_CFLAGS	+= $(call cc-option,-fdata-sections,)
777endif
778
779# arch Makefile may override CC so keep this after arch Makefile is included
780NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
781CHECKFLAGS     += $(NOSTDINC_FLAGS)
782
783# warn about C99 declaration after statement
784KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
785
786# disable pointer signed / unsigned warnings in gcc 4.0
787KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
788
789# disable invalid "can't wrap" optimizations for signed / pointers
790KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
791
792# conserve stack if available
793KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
794
795# disallow errors like 'EXPORT_GPL(foo);' with missing header
796KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
797
798# require functions to have arguments in prototypes, not empty 'int foo()'
799KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
800
801# Prohibit date/time macros, which would make the build non-deterministic
802KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
803
804# enforce correct pointer usage
805KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
806
807# Require designated initializers for all marked structures
808KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
809
810# use the deterministic mode of AR if available
811KBUILD_ARFLAGS := $(call ar-option,D)
812
813include scripts/Makefile.kasan
814include scripts/Makefile.extrawarn
815include scripts/Makefile.ubsan
816
817# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
818# last assignments
819KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
820KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
821KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
822
823# Use --build-id when available.
824LDFLAGS_BUILD_ID := $(patsubst -Wl$(comma)%,%,\
825			      $(call cc-ldoption, -Wl$(comma)--build-id,))
826KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
827LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
828
829ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
830LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
831endif
832
833ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
834LDFLAGS_vmlinux	+= $(call ld-option, -X,)
835endif
836
837# Default kernel image to build when no specific target is given.
838# KBUILD_IMAGE may be overruled on the command line or
839# set in the environment
840# Also any assignments in arch/$(ARCH)/Makefile take precedence over
841# this default value
842export KBUILD_IMAGE ?= vmlinux
843
844#
845# INSTALL_PATH specifies where to place the updated kernel and system map
846# images. Default is /boot, but you can set it to other values
847export	INSTALL_PATH ?= /boot
848
849#
850# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
851# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
852# an argument if needed. Otherwise it defaults to the kernel install path
853#
854export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
855
856#
857# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
858# relocations required by build roots.  This is not defined in the
859# makefile but the argument can be passed to make if needed.
860#
861
862MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
863export MODLIB
864
865#
866# INSTALL_MOD_STRIP, if defined, will cause modules to be
867# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
868# the default option --strip-debug will be used.  Otherwise,
869# INSTALL_MOD_STRIP value will be used as the options to the strip command.
870
871ifdef INSTALL_MOD_STRIP
872ifeq ($(INSTALL_MOD_STRIP),1)
873mod_strip_cmd = $(STRIP) --strip-debug
874else
875mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
876endif # INSTALL_MOD_STRIP=1
877else
878mod_strip_cmd = true
879endif # INSTALL_MOD_STRIP
880export mod_strip_cmd
881
882# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
883# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
884# or CONFIG_MODULE_COMPRESS_XZ.
885
886mod_compress_cmd = true
887ifdef CONFIG_MODULE_COMPRESS
888  ifdef CONFIG_MODULE_COMPRESS_GZIP
889    mod_compress_cmd = gzip -n -f
890  endif # CONFIG_MODULE_COMPRESS_GZIP
891  ifdef CONFIG_MODULE_COMPRESS_XZ
892    mod_compress_cmd = xz -f
893  endif # CONFIG_MODULE_COMPRESS_XZ
894endif # CONFIG_MODULE_COMPRESS
895export mod_compress_cmd
896
897# Select initial ramdisk compression format, default is gzip(1).
898# This shall be used by the dracut(8) tool while creating an initramfs image.
899#
900INITRD_COMPRESS-y                  := gzip
901INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
902INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
903INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
904INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
905INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
906# do not export INITRD_COMPRESS, since we didn't actually
907# choose a sane default compression above.
908# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
909
910ifdef CONFIG_MODULE_SIG_ALL
911$(eval $(call config_filename,MODULE_SIG_KEY))
912
913mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
914else
915mod_sign_cmd = true
916endif
917export mod_sign_cmd
918
919ifdef CONFIG_STACK_VALIDATION
920  has_libelf := $(call try-run,\
921		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
922  ifeq ($(has_libelf),1)
923    objtool_target := tools/objtool FORCE
924  else
925    ifdef CONFIG_UNWINDER_ORC
926      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
927    else
928      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
929    endif
930    SKIP_STACK_VALIDATION := 1
931    export SKIP_STACK_VALIDATION
932  endif
933endif
934
935
936ifeq ($(KBUILD_EXTMOD),)
937core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
938
939vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
940		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
941		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
942
943vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
944		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
945
946init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
947core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
948drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
949net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
950libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
951libs-y2		:= $(filter-out %.a, $(patsubst %/, %/built-in.o, $(libs-y)))
952virt-y		:= $(patsubst %/, %/built-in.o, $(virt-y))
953
954# Externally visible symbols (used by link-vmlinux.sh)
955export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
956export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
957export KBUILD_VMLINUX_LIBS := $(libs-y1)
958export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
959export LDFLAGS_vmlinux
960# used by scripts/package/Makefile
961export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
962
963vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
964
965# Include targets which we want to execute sequentially if the rest of the
966# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
967# evaluated more than once.
968PHONY += vmlinux_prereq
969vmlinux_prereq: $(vmlinux-deps) FORCE
970ifdef CONFIG_HEADERS_CHECK
971	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
972endif
973ifdef CONFIG_GDB_SCRIPTS
974	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
975endif
976ifdef CONFIG_TRIM_UNUSED_KSYMS
977	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
978	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
979endif
980
981# standalone target for easier testing
982include/generated/autoksyms.h: FORCE
983	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
984
985ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
986
987# Final link of vmlinux with optional arch pass after final link
988cmd_link-vmlinux =                                                 \
989	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
990	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
991
992vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
993	+$(call if_changed,link-vmlinux)
994
995# Build samples along the rest of the kernel
996ifdef CONFIG_SAMPLES
997vmlinux-dirs += samples
998endif
999
1000# The actual objects are generated when descending,
1001# make sure no implicit rule kicks in
1002$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1003
1004# Handle descending into subdirectories listed in $(vmlinux-dirs)
1005# Preset locale variables to speed up the build process. Limit locale
1006# tweaks to this spot to avoid wrong language settings when running
1007# make menuconfig etc.
1008# Error messages still appears in the original language
1009
1010PHONY += $(vmlinux-dirs)
1011$(vmlinux-dirs): prepare scripts
1012	$(Q)$(MAKE) $(build)=$@ need-builtin=1
1013
1014define filechk_kernel.release
1015	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1016endef
1017
1018# Store (new) KERNELRELEASE string in include/config/kernel.release
1019include/config/kernel.release: include/config/auto.conf FORCE
1020	$(call filechk,kernel.release)
1021
1022
1023# Things we need to do before we recursively start building the kernel
1024# or the modules are listed in "prepare".
1025# A multi level approach is used. prepareN is processed before prepareN-1.
1026# archprepare is used in arch Makefiles and when processed asm symlink,
1027# version.h and scripts_basic is processed / created.
1028
1029# Listed in dependency order
1030PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1031
1032# prepare3 is used to check if we are building in a separate output directory,
1033# and if so do:
1034# 1) Check that make has not been executed in the kernel src $(srctree)
1035prepare3: include/config/kernel.release
1036ifneq ($(KBUILD_SRC),)
1037	@$(kecho) '  Using $(srctree) as source for kernel'
1038	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1039		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1040		echo >&2 "  in the '$(srctree)' directory.";\
1041		/bin/false; \
1042	fi;
1043endif
1044
1045# prepare2 creates a makefile if using a separate output directory.
1046# From this point forward, .config has been reprocessed, so any rules
1047# that need to depend on updated CONFIG_* values can be checked here.
1048prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1049
1050prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1051                   include/config/auto.conf
1052	$(cmd_crmodverdir)
1053
1054archprepare: archheaders archscripts prepare1 scripts_basic
1055
1056prepare0: archprepare gcc-plugins
1057	$(Q)$(MAKE) $(build)=.
1058
1059# All the preparing..
1060prepare: prepare0 prepare-objtool
1061
1062# Support for using generic headers in asm-generic
1063PHONY += asm-generic uapi-asm-generic
1064asm-generic: uapi-asm-generic
1065	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1066	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
1067uapi-asm-generic:
1068	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1069	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1070
1071PHONY += prepare-objtool
1072prepare-objtool: $(objtool_target)
1073
1074# Check for CONFIG flags that require compiler support. Abort the build
1075# after .config has been processed, but before the kernel build starts.
1076#
1077# For security-sensitive CONFIG options, we don't want to fallback and/or
1078# silently change which compiler flags will be used, since that leads to
1079# producing kernels with different security feature characteristics
1080# depending on the compiler used. (For example, "But I selected
1081# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1082PHONY += prepare-compiler-check
1083prepare-compiler-check: FORCE
1084# Make sure compiler supports requested stack protector flag.
1085ifdef stackp-name
1086  ifeq ($(call cc-option, $(stackp-flag)),)
1087	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1088		  $(stackp-flag) not supported by compiler >&2 && exit 1
1089  endif
1090endif
1091# Make sure compiler does not have buggy stack-protector support.
1092ifdef stackp-check
1093  ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1094	@echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1095                  $(stackp-flag) available but compiler is broken >&2 && exit 1
1096  endif
1097endif
1098	@:
1099
1100# Generate some files
1101# ---------------------------------------------------------------------------
1102
1103# KERNELRELEASE can change from a few different places, meaning version.h
1104# needs to be updated, so this check is forced on all builds
1105
1106uts_len := 64
1107define filechk_utsrelease.h
1108	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1109	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1110	  exit 1;                                                         \
1111	fi;                                                               \
1112	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1113endef
1114
1115define filechk_version.h
1116	(echo \#define LINUX_VERSION_CODE $(shell                         \
1117	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1118	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1119endef
1120
1121$(version_h): $(srctree)/Makefile FORCE
1122	$(call filechk,version.h)
1123	$(Q)rm -f $(old_version_h)
1124
1125include/generated/utsrelease.h: include/config/kernel.release FORCE
1126	$(call filechk,utsrelease.h)
1127
1128PHONY += headerdep
1129headerdep:
1130	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1131	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1132
1133# ---------------------------------------------------------------------------
1134# Kernel headers
1135
1136#Default location for installed headers
1137export INSTALL_HDR_PATH = $(objtree)/usr
1138
1139# If we do an all arch process set dst to include/arch-$(SRCARCH)
1140hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1141
1142PHONY += archheaders
1143archheaders:
1144
1145PHONY += archscripts
1146archscripts:
1147
1148PHONY += __headers
1149__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1150	$(Q)$(MAKE) $(build)=scripts build_unifdef
1151
1152PHONY += headers_install_all
1153headers_install_all:
1154	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1155
1156PHONY += headers_install
1157headers_install: __headers
1158	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1159	  $(error Headers not exportable for the $(SRCARCH) architecture))
1160	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1161	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1162
1163PHONY += headers_check_all
1164headers_check_all: headers_install_all
1165	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1166
1167PHONY += headers_check
1168headers_check: headers_install
1169	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1170	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1171
1172# ---------------------------------------------------------------------------
1173# Kernel selftest
1174
1175PHONY += kselftest
1176kselftest:
1177	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1178
1179PHONY += kselftest-clean
1180kselftest-clean:
1181	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1182
1183PHONY += kselftest-merge
1184kselftest-merge:
1185	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1186	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1187		-m $(objtree)/.config \
1188		$(srctree)/tools/testing/selftests/*/config
1189	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1190
1191# ---------------------------------------------------------------------------
1192# Modules
1193
1194ifdef CONFIG_MODULES
1195
1196# By default, build modules as well
1197
1198all: modules
1199
1200# Build modules
1201#
1202# A module can be listed more than once in obj-m resulting in
1203# duplicate lines in modules.order files.  Those are removed
1204# using awk while concatenating to the final file.
1205
1206PHONY += modules
1207modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1208	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1209	@$(kecho) '  Building modules, stage 2.';
1210	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1211
1212modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1213	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1214
1215%/modules.builtin: include/config/auto.conf
1216	$(Q)$(MAKE) $(modbuiltin)=$*
1217
1218
1219# Target to prepare building external modules
1220PHONY += modules_prepare
1221modules_prepare: prepare scripts
1222
1223# Target to install modules
1224PHONY += modules_install
1225modules_install: _modinst_ _modinst_post
1226
1227PHONY += _modinst_
1228_modinst_:
1229	@rm -rf $(MODLIB)/kernel
1230	@rm -f $(MODLIB)/source
1231	@mkdir -p $(MODLIB)/kernel
1232	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1233	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1234		rm -f $(MODLIB)/build ; \
1235		ln -s $(CURDIR) $(MODLIB)/build ; \
1236	fi
1237	@cp -f $(objtree)/modules.order $(MODLIB)/
1238	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1239	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1240
1241# This depmod is only for convenience to give the initial
1242# boot a modules.dep even before / is mounted read-write.  However the
1243# boot script depmod is the master version.
1244PHONY += _modinst_post
1245_modinst_post: _modinst_
1246	$(call cmd,depmod)
1247
1248ifeq ($(CONFIG_MODULE_SIG), y)
1249PHONY += modules_sign
1250modules_sign:
1251	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1252endif
1253
1254else # CONFIG_MODULES
1255
1256# Modules not configured
1257# ---------------------------------------------------------------------------
1258
1259PHONY += modules modules_install
1260modules modules_install:
1261	@echo >&2
1262	@echo >&2 "The present kernel configuration has modules disabled."
1263	@echo >&2 "Type 'make config' and enable loadable module support."
1264	@echo >&2 "Then build a kernel with module support enabled."
1265	@echo >&2
1266	@exit 1
1267
1268endif # CONFIG_MODULES
1269
1270###
1271# Cleaning is done on three levels.
1272# make clean     Delete most generated files
1273#                Leave enough to build external modules
1274# make mrproper  Delete the current configuration, and all generated files
1275# make distclean Remove editor backup files, patch leftover files and the like
1276
1277# Directories & files removed with 'make clean'
1278CLEAN_DIRS  += $(MODVERDIR)
1279
1280# Directories & files removed with 'make mrproper'
1281MRPROPER_DIRS  += include/config usr/include include/generated          \
1282		  arch/*/include/generated .tmp_objdiff
1283MRPROPER_FILES += .config .config.old .version \
1284		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1285		  signing_key.pem signing_key.priv signing_key.x509	\
1286		  x509.genkey extra_certificates signing_key.x509.keyid	\
1287		  signing_key.x509.signer vmlinux-gdb.py
1288
1289# clean - Delete most, but leave enough to build external modules
1290#
1291clean: rm-dirs  := $(CLEAN_DIRS)
1292clean: rm-files := $(CLEAN_FILES)
1293clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1294
1295PHONY += $(clean-dirs) clean archclean vmlinuxclean
1296$(clean-dirs):
1297	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1298
1299vmlinuxclean:
1300	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1301	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1302
1303clean: archclean vmlinuxclean
1304
1305# mrproper - Delete all generated files, including .config
1306#
1307mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1308mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1309mrproper-dirs      := $(addprefix _mrproper_,scripts)
1310
1311PHONY += $(mrproper-dirs) mrproper archmrproper
1312$(mrproper-dirs):
1313	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1314
1315mrproper: clean archmrproper $(mrproper-dirs)
1316	$(call cmd,rmdirs)
1317	$(call cmd,rmfiles)
1318
1319# distclean
1320#
1321PHONY += distclean
1322
1323distclean: mrproper
1324	@find $(srctree) $(RCS_FIND_IGNORE) \
1325		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1326		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1327		-o -name 'core' \) \
1328		-type f -print | xargs rm -f
1329
1330
1331# Packaging of the kernel to various formats
1332# ---------------------------------------------------------------------------
1333# rpm target kept for backward compatibility
1334package-dir	:= scripts/package
1335
1336%src-pkg: FORCE
1337	$(Q)$(MAKE) $(build)=$(package-dir) $@
1338%pkg: include/config/kernel.release FORCE
1339	$(Q)$(MAKE) $(build)=$(package-dir) $@
1340rpm: include/config/kernel.release FORCE
1341	$(Q)$(MAKE) $(build)=$(package-dir) $@
1342
1343
1344# Brief documentation of the typical targets used
1345# ---------------------------------------------------------------------------
1346
1347boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1348boards := $(sort $(notdir $(boards)))
1349board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1350board-dirs := $(sort $(notdir $(board-dirs:/=)))
1351
1352PHONY += help
1353help:
1354	@echo  'Cleaning targets:'
1355	@echo  '  clean		  - Remove most generated files but keep the config and'
1356	@echo  '                    enough build support to build external modules'
1357	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1358	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1359	@echo  ''
1360	@echo  'Configuration targets:'
1361	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1362	@echo  ''
1363	@echo  'Other generic targets:'
1364	@echo  '  all		  - Build all targets marked with [*]'
1365	@echo  '* vmlinux	  - Build the bare kernel'
1366	@echo  '* modules	  - Build all modules'
1367	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1368	@echo  '  dir/            - Build all files in dir and below'
1369	@echo  '  dir/file.[ois]  - Build specified target only'
1370	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1371	@echo  '                    (requires compiler support for LLVM assembly generation)'
1372	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1373	@echo  '                    (requires a recent binutils and recent build (System.map))'
1374	@echo  '  dir/file.ko     - Build module including final link'
1375	@echo  '  modules_prepare - Set up for building external modules'
1376	@echo  '  tags/TAGS	  - Generate tags file for editors'
1377	@echo  '  cscope	  - Generate cscope index'
1378	@echo  '  gtags           - Generate GNU GLOBAL index'
1379	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1380	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1381	@echo  '  image_name	  - Output the image name (use with make -s)'
1382	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1383	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1384	 echo  ''
1385	@echo  'Static analysers:'
1386	@echo  '  checkstack      - Generate a list of stack hogs'
1387	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1388	@echo  '  versioncheck    - Sanity check on version.h usage'
1389	@echo  '  includecheck    - Check for duplicate included header files'
1390	@echo  '  export_report   - List the usages of all exported symbols'
1391	@echo  '  headers_check   - Sanity check on exported headers'
1392	@echo  '  headerdep       - Detect inclusion cycles in headers'
1393	@echo  '  coccicheck      - Check with Coccinelle'
1394	@echo  ''
1395	@echo  'Kernel selftest:'
1396	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1397	@echo  '                    Build, install, and boot kernel before'
1398	@echo  '                    running kselftest on it'
1399	@echo  '  kselftest-clean - Remove all generated kselftest files'
1400	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1401	@echo  '                    .config.'
1402	@echo  ''
1403	@echo 'Userspace tools targets:'
1404	@echo '  use "make tools/help"'
1405	@echo '  or  "cd tools; make help"'
1406	@echo  ''
1407	@echo  'Kernel packaging:'
1408	@$(MAKE) $(build)=$(package-dir) help
1409	@echo  ''
1410	@echo  'Documentation targets:'
1411	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1412	@echo  ''
1413	@echo  'Architecture specific targets ($(SRCARCH)):'
1414	@$(if $(archhelp),$(archhelp),\
1415		echo '  No architecture specific help defined for $(SRCARCH)')
1416	@echo  ''
1417	@$(if $(boards), \
1418		$(foreach b, $(boards), \
1419		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1420		echo '')
1421	@$(if $(board-dirs), \
1422		$(foreach b, $(board-dirs), \
1423		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1424		printf "  %-16s - Show all of the above\\n" help-boards; \
1425		echo '')
1426
1427	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1428	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1429	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1430	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1431	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1432	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1433	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1434	@echo  '		1: warnings which may be relevant and do not occur too often'
1435	@echo  '		2: warnings which occur quite often but may still be relevant'
1436	@echo  '		3: more obscure warnings, can most likely be ignored'
1437	@echo  '		Multiple levels can be combined with W=12 or W=123'
1438	@echo  ''
1439	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1440	@echo  'For further info see the ./README file'
1441
1442
1443help-board-dirs := $(addprefix help-,$(board-dirs))
1444
1445help-boards: $(help-board-dirs)
1446
1447boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1448
1449$(help-board-dirs): help-%:
1450	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1451	@$(if $(boards-per-dir), \
1452		$(foreach b, $(boards-per-dir), \
1453		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1454		echo '')
1455
1456
1457# Documentation targets
1458# ---------------------------------------------------------------------------
1459DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1460	       linkcheckdocs dochelp refcheckdocs
1461PHONY += $(DOC_TARGETS)
1462$(DOC_TARGETS): scripts_basic FORCE
1463	$(Q)$(MAKE) $(build)=Documentation $@
1464
1465else # KBUILD_EXTMOD
1466
1467###
1468# External module support.
1469# When building external modules the kernel used as basis is considered
1470# read-only, and no consistency checks are made and the make
1471# system is not used on the basis kernel. If updates are required
1472# in the basis kernel ordinary make commands (without M=...) must
1473# be used.
1474#
1475# The following are the only valid targets when building external
1476# modules.
1477# make M=dir clean     Delete all automatically generated files
1478# make M=dir modules   Make all modules in specified dir
1479# make M=dir	       Same as 'make M=dir modules'
1480# make M=dir modules_install
1481#                      Install the modules built in the module directory
1482#                      Assumes install directory is already created
1483
1484# We are always building modules
1485KBUILD_MODULES := 1
1486PHONY += crmodverdir
1487crmodverdir:
1488	$(cmd_crmodverdir)
1489
1490PHONY += $(objtree)/Module.symvers
1491$(objtree)/Module.symvers:
1492	@test -e $(objtree)/Module.symvers || ( \
1493	echo; \
1494	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1495	echo "           is missing; modules will have no dependencies and modversions."; \
1496	echo )
1497
1498module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1499PHONY += $(module-dirs) modules
1500$(module-dirs): crmodverdir $(objtree)/Module.symvers
1501	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1502
1503modules: $(module-dirs)
1504	@$(kecho) '  Building modules, stage 2.';
1505	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1506
1507PHONY += modules_install
1508modules_install: _emodinst_ _emodinst_post
1509
1510install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1511PHONY += _emodinst_
1512_emodinst_:
1513	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1514	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1515
1516PHONY += _emodinst_post
1517_emodinst_post: _emodinst_
1518	$(call cmd,depmod)
1519
1520clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1521
1522PHONY += $(clean-dirs) clean
1523$(clean-dirs):
1524	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1525
1526clean:	rm-dirs := $(MODVERDIR)
1527clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1528
1529PHONY += help
1530help:
1531	@echo  '  Building external modules.'
1532	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1533	@echo  ''
1534	@echo  '  modules         - default target, build the module(s)'
1535	@echo  '  modules_install - install the module'
1536	@echo  '  clean           - remove generated files in module directory only'
1537	@echo  ''
1538
1539# Dummies...
1540PHONY += prepare scripts
1541prepare: ;
1542scripts: ;
1543endif # KBUILD_EXTMOD
1544
1545clean: $(clean-dirs)
1546	$(call cmd,rmdirs)
1547	$(call cmd,rmfiles)
1548	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1549		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1550		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1551		-o -name '*.dwo'  \
1552		-o -name '*.su'  \
1553		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1554		-o -name '*.symtypes' -o -name 'modules.order' \
1555		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1556		-o -name .cache.mk \
1557		-o -name '*.c.[012]*.*' \
1558		-o -name '*.ll' \
1559		-o -name '*.gcno' \) -type f -print | xargs rm -f
1560
1561# Generate tags for editors
1562# ---------------------------------------------------------------------------
1563quiet_cmd_tags = GEN     $@
1564      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1565
1566tags TAGS cscope gtags: FORCE
1567	$(call cmd,tags)
1568
1569# Scripts to check various things for consistency
1570# ---------------------------------------------------------------------------
1571
1572PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1573
1574includecheck:
1575	find $(srctree)/* $(RCS_FIND_IGNORE) \
1576		-name '*.[hcS]' -type f -print | sort \
1577		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1578
1579versioncheck:
1580	find $(srctree)/* $(RCS_FIND_IGNORE) \
1581		-name '*.[hcS]' -type f -print | sort \
1582		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1583
1584coccicheck:
1585	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1586
1587namespacecheck:
1588	$(PERL) $(srctree)/scripts/namespace.pl
1589
1590export_report:
1591	$(PERL) $(srctree)/scripts/export_report.pl
1592
1593endif #ifeq ($(config-targets),1)
1594endif #ifeq ($(mixed-targets),1)
1595
1596PHONY += checkstack kernelrelease kernelversion image_name
1597
1598# UML needs a little special treatment here.  It wants to use the host
1599# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1600# else wants $(ARCH), including people doing cross-builds, which means
1601# that $(SUBARCH) doesn't work here.
1602ifeq ($(ARCH), um)
1603CHECKSTACK_ARCH := $(SUBARCH)
1604else
1605CHECKSTACK_ARCH := $(ARCH)
1606endif
1607checkstack:
1608	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1609	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1610
1611kernelrelease:
1612	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1613
1614kernelversion:
1615	@echo $(KERNELVERSION)
1616
1617image_name:
1618	@echo $(KBUILD_IMAGE)
1619
1620# Clear a bunch of variables before executing the submake
1621tools/: FORCE
1622	$(Q)mkdir -p $(objtree)/tools
1623	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1624
1625tools/%: FORCE
1626	$(Q)mkdir -p $(objtree)/tools
1627	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1628
1629# Single targets
1630# ---------------------------------------------------------------------------
1631# Single targets are compatible with:
1632# - build with mixed source and output
1633# - build with separate output dir 'make O=...'
1634# - external modules
1635#
1636#  target-dir => where to store outputfile
1637#  build-dir  => directory in kernel source tree to use
1638
1639ifeq ($(KBUILD_EXTMOD),)
1640        build-dir  = $(patsubst %/,%,$(dir $@))
1641        target-dir = $(dir $@)
1642else
1643        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1644        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1645        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1646endif
1647
1648%.s: %.c prepare scripts FORCE
1649	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1650%.i: %.c prepare scripts FORCE
1651	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1652%.o: %.c prepare scripts FORCE
1653	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1654%.lst: %.c prepare scripts FORCE
1655	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1656%.s: %.S prepare scripts FORCE
1657	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1658%.o: %.S prepare scripts FORCE
1659	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1660%.symtypes: %.c prepare scripts FORCE
1661	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1662%.ll: %.c prepare scripts FORCE
1663	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1664
1665# Modules
1666/: prepare scripts FORCE
1667	$(cmd_crmodverdir)
1668	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1669	$(build)=$(build-dir)
1670# Make sure the latest headers are built for Documentation
1671Documentation/ samples/: headers_install
1672%/: prepare scripts FORCE
1673	$(cmd_crmodverdir)
1674	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1675	$(build)=$(build-dir)
1676%.ko: prepare scripts FORCE
1677	$(cmd_crmodverdir)
1678	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1679	$(build)=$(build-dir) $(@:.ko=.o)
1680	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1681
1682# FIXME Should go into a make.lib or something
1683# ===========================================================================
1684
1685quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1686      cmd_rmdirs = rm -rf $(rm-dirs)
1687
1688quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1689      cmd_rmfiles = rm -f $(rm-files)
1690
1691# Run depmod only if we have System.map and depmod is executable
1692quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1693      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1694                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1695
1696# Create temporary dir for module support files
1697# clean it up only when building all modules
1698cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1699                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1700
1701# read all saved command lines
1702
1703cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1704
1705ifneq ($(cmd_files),)
1706  $(cmd_files): ;	# Do not try to update included dependency files
1707  include $(cmd_files)
1708endif
1709
1710endif	# skip-makefile
1711
1712PHONY += FORCE
1713FORCE:
1714
1715# Declare the contents of the .PHONY variable as phony.  We keep that
1716# information in a variable so we can use it in if_changed and friends.
1717.PHONY: $(PHONY)
1718