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1VERSION = 3
2PATCHLEVEL = 1
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = "Divemaster Edition"
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# We are using a recursive build, so we need to do a little thinking
26# to get the ordering right.
27#
28# Most importantly: sub-Makefiles should only ever modify files in
29# their own directory. If in some directory we have a dependency on
30# a file in another dir (which doesn't happen often, but it's often
31# unavoidable when linking the built-in.o targets which finally
32# turn into vmlinux), we will call a sub make in that other dir, and
33# after that we are sure that everything which is in that other dir
34# is now up to date.
35#
36# The only cases where we need to modify files which have global
37# effects are thus separated out and done before the recursive
38# descending is started. They are now explicitly listed as the
39# prepare rule.
40
41# To put more focus on warnings, be less verbose as default
42# Use 'make V=1' to see the full commands
43
44ifeq ("$(origin V)", "command line")
45 KBUILD_VERBOSE = $(V)
46endif
47ifndef KBUILD_VERBOSE
48 KBUILD_VERBOSE = 0
49endif
50
51# Call a source code checker (by default, "sparse") as part of the
52# C compilation.
53#
54# Use 'make C=1' to enable checking of only re-compiled files.
55# Use 'make C=2' to enable checking of *all* source files, regardless
56# of whether they are re-compiled or not.
57#
58# See the file "Documentation/sparse.txt" for more details, including
59# where to get the "sparse" utility.
60
61ifeq ("$(origin C)", "command line")
62 KBUILD_CHECKSRC = $(C)
63endif
64ifndef KBUILD_CHECKSRC
65 KBUILD_CHECKSRC = 0
66endif
67
68# Use make M=dir to specify directory of external module to build
69# Old syntax make ... SUBDIRS=$PWD is still supported
70# Setting the environment variable KBUILD_EXTMOD take precedence
71ifdef SUBDIRS
72 KBUILD_EXTMOD ?= $(SUBDIRS)
73endif
74
75ifeq ("$(origin M)", "command line")
76 KBUILD_EXTMOD := $(M)
77endif
78
79# kbuild supports saving output files in a separate directory.
80# To locate output files in a separate directory two syntaxes are supported.
81# In both cases the working directory must be the root of the kernel src.
82# 1) O=
83# Use "make O=dir/to/store/output/files/"
84#
85# 2) Set KBUILD_OUTPUT
86# Set the environment variable KBUILD_OUTPUT to point to the directory
87# where the output files shall be placed.
88# export KBUILD_OUTPUT=dir/to/store/output/files/
89# make
90#
91# The O= assignment takes precedence over the KBUILD_OUTPUT environment
92# variable.
93
94
95# KBUILD_SRC is set on invocation of make in OBJ directory
96# KBUILD_SRC is not intended to be used by the regular user (for now)
97ifeq ($(KBUILD_SRC),)
98
99# OK, Make called in directory where kernel src resides
100# Do we want to locate output files in a separate directory?
101ifeq ("$(origin O)", "command line")
102 KBUILD_OUTPUT := $(O)
103endif
104
105ifeq ("$(origin W)", "command line")
106 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
107endif
108
109# That's our default target when none is given on the command line
110PHONY := _all
111_all:
112
113# Cancel implicit rules on top Makefile
114$(CURDIR)/Makefile Makefile: ;
115
116ifneq ($(KBUILD_OUTPUT),)
117# Invoke a second make in the output directory, passing relevant variables
118# check that the output directory actually exists
119saved-output := $(KBUILD_OUTPUT)
120KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122 $(error output directory "$(saved-output)" does not exist))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 $(Q)@:
128
129sub-make: FORCE
130 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
131 KBUILD_SRC=$(CURDIR) \
132 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
133 $(filter-out _all sub-make,$(MAKECMDGOALS))
134
135# Leave processing to above invocation of make
136skip-makefile := 1
137endif # ifneq ($(KBUILD_OUTPUT),)
138endif # ifeq ($(KBUILD_SRC),)
139
140# We process the rest of the Makefile if this is the final invocation of make
141ifeq ($(skip-makefile),)
142
143# If building an external module we do not care about the all: rule
144# but instead _all depend on modules
145PHONY += all
146ifeq ($(KBUILD_EXTMOD),)
147_all: all
148else
149_all: modules
150endif
151
152srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
153objtree := $(CURDIR)
154src := $(srctree)
155obj := $(objtree)
156
157VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
158
159export srctree objtree VPATH
160
161
162# SUBARCH tells the usermode build what the underlying arch is. That is set
163# first, and if a usermode build is happening, the "ARCH=um" on the command
164# line overrides the setting of ARCH below. If a native build is happening,
165# then ARCH is assigned, getting whatever value it gets normally, and
166# SUBARCH is subsequently ignored.
167
168SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64 \
169 -e s/arm.*/arm/ -e s/sa110/arm/ \
170 -e s/s390x/s390/ -e s/parisc64/parisc/ \
171 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
172 -e s/sh[234].*/sh/ )
173
174# Cross compiling and selecting different set of gcc/bin-utils
175# ---------------------------------------------------------------------------
176#
177# When performing cross compilation for other architectures ARCH shall be set
178# to the target architecture. (See arch/* for the possibilities).
179# ARCH can be set during invocation of make:
180# make ARCH=ia64
181# Another way is to have ARCH set in the environment.
182# The default ARCH is the host where make is executed.
183
184# CROSS_COMPILE specify the prefix used for all executables used
185# during compilation. Only gcc and related bin-utils executables
186# are prefixed with $(CROSS_COMPILE).
187# CROSS_COMPILE can be set on the command line
188# make CROSS_COMPILE=ia64-linux-
189# Alternatively CROSS_COMPILE can be set in the environment.
190# A third alternative is to store a setting in .config so that plain
191# "make" in the configured kernel build directory always uses that.
192# Default value for CROSS_COMPILE is not to prefix executables
193# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
194export KBUILD_BUILDHOST := $(SUBARCH)
195ARCH ?= $(SUBARCH)
196CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
197
198# Architecture as present in compile.h
199UTS_MACHINE := $(ARCH)
200SRCARCH := $(ARCH)
201
202# Additional ARCH settings for x86
203ifeq ($(ARCH),i386)
204 SRCARCH := x86
205endif
206ifeq ($(ARCH),x86_64)
207 SRCARCH := x86
208endif
209
210# Additional ARCH settings for sparc
211ifeq ($(ARCH),sparc32)
212 SRCARCH := sparc
213endif
214ifeq ($(ARCH),sparc64)
215 SRCARCH := sparc
216endif
217
218# Additional ARCH settings for sh
219ifeq ($(ARCH),sh64)
220 SRCARCH := sh
221endif
222
223# Additional ARCH settings for tile
224ifeq ($(ARCH),tilepro)
225 SRCARCH := tile
226endif
227ifeq ($(ARCH),tilegx)
228 SRCARCH := tile
229endif
230
231# Where to locate arch specific headers
232hdr-arch := $(SRCARCH)
233
234ifeq ($(ARCH),m68knommu)
235 hdr-arch := m68k
236endif
237
238KCONFIG_CONFIG ?= .config
239export KCONFIG_CONFIG
240
241# SHELL used by kbuild
242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
245
246HOSTCC = gcc
247HOSTCXX = g++
248HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
249HOSTCXXFLAGS = -O2
250
251# Decide whether to build built-in, modular, or both.
252# Normally, just do built-in.
253
254KBUILD_MODULES :=
255KBUILD_BUILTIN := 1
256
257# If we have only "make modules", don't compile built-in objects.
258# When we're building modules with modversions, we need to consider
259# the built-in objects during the descend as well, in order to
260# make sure the checksums are up to date before we record them.
261
262ifeq ($(MAKECMDGOALS),modules)
263 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
264endif
265
266# If we have "make <whatever> modules", compile modules
267# in addition to whatever we do anyway.
268# Just "make" or "make all" shall build modules as well
269
270ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
271 KBUILD_MODULES := 1
272endif
273
274ifeq ($(MAKECMDGOALS),)
275 KBUILD_MODULES := 1
276endif
277
278export KBUILD_MODULES KBUILD_BUILTIN
279export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
280
281# Beautify output
282# ---------------------------------------------------------------------------
283#
284# Normally, we echo the whole command before executing it. By making
285# that echo $($(quiet)$(cmd)), we now have the possibility to set
286# $(quiet) to choose other forms of output instead, e.g.
287#
288# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
289# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
290#
291# If $(quiet) is empty, the whole command will be printed.
292# If it is set to "quiet_", only the short version will be printed.
293# If it is set to "silent_", nothing will be printed at all, since
294# the variable $(silent_cmd_cc_o_c) doesn't exist.
295#
296# A simple variant is to prefix commands with $(Q) - that's useful
297# for commands that shall be hidden in non-verbose mode.
298#
299# $(Q)ln $@ :<
300#
301# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
302# If KBUILD_VERBOSE equals 1 then the above command is displayed.
303
304ifeq ($(KBUILD_VERBOSE),1)
305 quiet =
306 Q =
307else
308 quiet=quiet_
309 Q = @
310endif
311
312# If the user is running make -s (silent mode), suppress echoing of
313# commands
314
315ifneq ($(findstring s,$(MAKEFLAGS)),)
316 quiet=silent_
317endif
318
319export quiet Q KBUILD_VERBOSE
320
321
322# Look for make include files relative to root of kernel src
323MAKEFLAGS += --include-dir=$(srctree)
324
325# We need some generic definitions (do not try to remake the file).
326$(srctree)/scripts/Kbuild.include: ;
327include $(srctree)/scripts/Kbuild.include
328
329# Make variables (CC, etc...)
330
331AS = $(CROSS_COMPILE)as
332LD = $(CROSS_COMPILE)ld
333CC = $(CROSS_COMPILE)gcc
334CPP = $(CC) -E
335AR = $(CROSS_COMPILE)ar
336NM = $(CROSS_COMPILE)nm
337STRIP = $(CROSS_COMPILE)strip
338OBJCOPY = $(CROSS_COMPILE)objcopy
339OBJDUMP = $(CROSS_COMPILE)objdump
340AWK = awk
341GENKSYMS = scripts/genksyms/genksyms
342INSTALLKERNEL := installkernel
343DEPMOD = /sbin/depmod
344KALLSYMS = scripts/kallsyms
345PERL = perl
346CHECK = sparse
347
348CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
349 -Wbitwise -Wno-return-void $(CF)
350CFLAGS_MODULE =
351AFLAGS_MODULE =
352LDFLAGS_MODULE =
353CFLAGS_KERNEL =
354AFLAGS_KERNEL =
355CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
356
357
358# Use LINUXINCLUDE when you must reference the include/ directory.
359# Needed to be compatible with the O= option
360LINUXINCLUDE := -I$(srctree)/arch/$(hdr-arch)/include \
361 -Iarch/$(hdr-arch)/include/generated -Iinclude \
362 $(if $(KBUILD_SRC), -I$(srctree)/include) \
363 -include $(srctree)/include/linux/kconfig.h
364
365KBUILD_CPPFLAGS := -D__KERNEL__
366
367KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
368 -fno-strict-aliasing -fno-common \
369 -Werror-implicit-function-declaration \
370 -Wno-format-security \
371 -fno-delete-null-pointer-checks
372KBUILD_AFLAGS_KERNEL :=
373KBUILD_CFLAGS_KERNEL :=
374KBUILD_AFLAGS := -D__ASSEMBLY__
375KBUILD_AFLAGS_MODULE := -DMODULE
376KBUILD_CFLAGS_MODULE := -DMODULE
377KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
378
379# Read KERNELRELEASE from include/config/kernel.release (if it exists)
380KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
381KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
382
383export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
384export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
385export CPP AR NM STRIP OBJCOPY OBJDUMP
386export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
387export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
388
389export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
390export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
391export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
392export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
393export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
394export KBUILD_ARFLAGS
395
396# When compiling out-of-tree modules, put MODVERDIR in the module
397# tree rather than in the kernel tree. The kernel tree might
398# even be read-only.
399export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
400
401# Files to ignore in find ... statements
402
403RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
404export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
405
406# ===========================================================================
407# Rules shared between *config targets and build targets
408
409# Basic helpers built in scripts
410PHONY += scripts_basic
411scripts_basic:
412 $(Q)$(MAKE) $(build)=scripts/basic
413 $(Q)rm -f .tmp_quiet_recordmcount
414
415# To avoid any implicit rule to kick in, define an empty command.
416scripts/basic/%: scripts_basic ;
417
418PHONY += outputmakefile
419# outputmakefile generates a Makefile in the output directory, if using a
420# separate output directory. This allows convenient use of make in the
421# output directory.
422outputmakefile:
423ifneq ($(KBUILD_SRC),)
424 $(Q)ln -fsn $(srctree) source
425 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
426 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
427endif
428
429# Support for using generic headers in asm-generic
430PHONY += asm-generic
431asm-generic:
432 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
433 obj=arch/$(SRCARCH)/include/generated/asm
434
435# To make sure we do not include .config for any of the *config targets
436# catch them early, and hand them over to scripts/kconfig/Makefile
437# It is allowed to specify more targets when calling make, including
438# mixing *config targets and build targets.
439# For example 'make oldconfig all'.
440# Detect when mixed targets is specified, and make a second invocation
441# of make so .config is not included in this case either (for *config).
442
443no-dot-config-targets := clean mrproper distclean \
444 cscope gtags TAGS tags help %docs check% coccicheck \
445 include/linux/version.h headers_% \
446 kernelversion %src-pkg
447
448config-targets := 0
449mixed-targets := 0
450dot-config := 1
451
452ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
453 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
454 dot-config := 0
455 endif
456endif
457
458ifeq ($(KBUILD_EXTMOD),)
459 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
460 config-targets := 1
461 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
462 mixed-targets := 1
463 endif
464 endif
465endif
466
467ifeq ($(mixed-targets),1)
468# ===========================================================================
469# We're called with mixed targets (*config and build targets).
470# Handle them one by one.
471
472%:: FORCE
473 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
474
475else
476ifeq ($(config-targets),1)
477# ===========================================================================
478# *config targets only - make sure prerequisites are updated, and descend
479# in scripts/kconfig to make the *config target
480
481# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
482# KBUILD_DEFCONFIG may point out an alternative default configuration
483# used for 'make defconfig'
484include $(srctree)/arch/$(SRCARCH)/Makefile
485export KBUILD_DEFCONFIG KBUILD_KCONFIG
486
487config: scripts_basic outputmakefile FORCE
488 $(Q)mkdir -p include/linux include/config
489 $(Q)$(MAKE) $(build)=scripts/kconfig $@
490
491%config: scripts_basic outputmakefile FORCE
492 $(Q)mkdir -p include/linux include/config
493 $(Q)$(MAKE) $(build)=scripts/kconfig $@
494
495else
496# ===========================================================================
497# Build targets only - this includes vmlinux, arch specific targets, clean
498# targets and others. In general all targets except *config targets.
499
500ifeq ($(KBUILD_EXTMOD),)
501# Additional helpers built in scripts
502# Carefully list dependencies so we do not try to build scripts twice
503# in parallel
504PHONY += scripts
505scripts: scripts_basic include/config/auto.conf include/config/tristate.conf
506 $(Q)$(MAKE) $(build)=$(@)
507
508# Objects we will link into vmlinux / subdirs we need to visit
509init-y := init
510drivers-y := drivers sound firmware
511net-y := net
512libs-y := lib
513core-y := usr
514endif # KBUILD_EXTMOD
515
516ifeq ($(dot-config),1)
517# Read in config
518-include include/config/auto.conf
519
520ifeq ($(KBUILD_EXTMOD),)
521# Read in dependencies to all Kconfig* files, make sure to run
522# oldconfig if changes are detected.
523-include include/config/auto.conf.cmd
524
525# To avoid any implicit rule to kick in, define an empty command
526$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
527
528# If .config is newer than include/config/auto.conf, someone tinkered
529# with it and forgot to run make oldconfig.
530# if auto.conf.cmd is missing then we are probably in a cleaned tree so
531# we execute the config step to be sure to catch updated Kconfig files
532include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
533 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
534else
535# external modules needs include/generated/autoconf.h and include/config/auto.conf
536# but do not care if they are up-to-date. Use auto.conf to trigger the test
537PHONY += include/config/auto.conf
538
539include/config/auto.conf:
540 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
541 echo; \
542 echo " ERROR: Kernel configuration is invalid."; \
543 echo " include/generated/autoconf.h or $@ are missing.";\
544 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
545 echo; \
546 /bin/false)
547
548endif # KBUILD_EXTMOD
549
550else
551# Dummy target needed, because used as prerequisite
552include/config/auto.conf: ;
553endif # $(dot-config)
554
555# The all: target is the default when no target is given on the
556# command line.
557# This allow a user to issue only 'make' to build a kernel including modules
558# Defaults to vmlinux, but the arch makefile usually adds further targets
559all: vmlinux
560
561ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
562KBUILD_CFLAGS += -Os
563else
564KBUILD_CFLAGS += -O2
565endif
566
567include $(srctree)/arch/$(SRCARCH)/Makefile
568
569ifneq ($(CONFIG_FRAME_WARN),0)
570KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
571endif
572
573# Force gcc to behave correct even for buggy distributions
574ifndef CONFIG_CC_STACKPROTECTOR
575KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
576endif
577
578# This warning generated too much noise in a regular build.
579# Use make W=1 to enable this warning (see scripts/Makefile.build)
580KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
581
582ifdef CONFIG_FRAME_POINTER
583KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
584else
585# Some targets (ARM with Thumb2, for example), can't be built with frame
586# pointers. For those, we don't have FUNCTION_TRACER automatically
587# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
588# incompatible with -fomit-frame-pointer with current GCC, so we don't use
589# -fomit-frame-pointer with FUNCTION_TRACER.
590ifndef CONFIG_FUNCTION_TRACER
591KBUILD_CFLAGS += -fomit-frame-pointer
592endif
593endif
594
595ifdef CONFIG_DEBUG_INFO
596KBUILD_CFLAGS += -g
597KBUILD_AFLAGS += -gdwarf-2
598endif
599
600ifdef CONFIG_DEBUG_INFO_REDUCED
601KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly)
602endif
603
604ifdef CONFIG_FUNCTION_TRACER
605KBUILD_CFLAGS += -pg
606ifdef CONFIG_DYNAMIC_FTRACE
607 ifdef CONFIG_HAVE_C_RECORDMCOUNT
608 BUILD_C_RECORDMCOUNT := y
609 export BUILD_C_RECORDMCOUNT
610 endif
611endif
612endif
613
614# We trigger additional mismatches with less inlining
615ifdef CONFIG_DEBUG_SECTION_MISMATCH
616KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
617endif
618
619# arch Makefile may override CC so keep this after arch Makefile is included
620NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
621CHECKFLAGS += $(NOSTDINC_FLAGS)
622
623# warn about C99 declaration after statement
624KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
625
626# disable pointer signed / unsigned warnings in gcc 4.0
627KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
628
629# disable invalid "can't wrap" optimizations for signed / pointers
630KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
631
632# conserve stack if available
633KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
634
635# use the deterministic mode of AR if available
636KBUILD_ARFLAGS := $(call ar-option,D)
637
638# check for 'asm goto'
639ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
640 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
641endif
642
643# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
644# But warn user when we do so
645warn-assign = \
646$(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
647
648ifneq ($(KCPPFLAGS),)
649 $(call warn-assign,CPPFLAGS)
650 KBUILD_CPPFLAGS += $(KCPPFLAGS)
651endif
652ifneq ($(KAFLAGS),)
653 $(call warn-assign,AFLAGS)
654 KBUILD_AFLAGS += $(KAFLAGS)
655endif
656ifneq ($(KCFLAGS),)
657 $(call warn-assign,CFLAGS)
658 KBUILD_CFLAGS += $(KCFLAGS)
659endif
660
661# Use --build-id when available.
662LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
663 $(call cc-ldoption, -Wl$(comma)--build-id,))
664KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
665LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
666
667ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
668LDFLAGS_vmlinux += $(call ld-option, -X,)
669endif
670
671# Default kernel image to build when no specific target is given.
672# KBUILD_IMAGE may be overruled on the command line or
673# set in the environment
674# Also any assignments in arch/$(ARCH)/Makefile take precedence over
675# this default value
676export KBUILD_IMAGE ?= vmlinux
677
678#
679# INSTALL_PATH specifies where to place the updated kernel and system map
680# images. Default is /boot, but you can set it to other values
681export INSTALL_PATH ?= /boot
682
683#
684# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
685# relocations required by build roots. This is not defined in the
686# makefile but the argument can be passed to make if needed.
687#
688
689MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
690export MODLIB
691
692#
693# INSTALL_MOD_STRIP, if defined, will cause modules to be
694# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
695# the default option --strip-debug will be used. Otherwise,
696# INSTALL_MOD_STRIP value will be used as the options to the strip command.
697
698ifdef INSTALL_MOD_STRIP
699ifeq ($(INSTALL_MOD_STRIP),1)
700mod_strip_cmd = $(STRIP) --strip-debug
701else
702mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
703endif # INSTALL_MOD_STRIP=1
704else
705mod_strip_cmd = true
706endif # INSTALL_MOD_STRIP
707export mod_strip_cmd
708
709
710ifeq ($(KBUILD_EXTMOD),)
711core-y += kernel mm fs ipc security crypto block
712
713vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
714 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
715 $(net-y) $(net-m) $(libs-y) $(libs-m)))
716
717vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
718 $(init-n) $(init-) \
719 $(core-n) $(core-) $(drivers-n) $(drivers-) \
720 $(net-n) $(net-) $(libs-n) $(libs-))))
721
722init-y := $(patsubst %/, %/built-in.o, $(init-y))
723core-y := $(patsubst %/, %/built-in.o, $(core-y))
724drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
725net-y := $(patsubst %/, %/built-in.o, $(net-y))
726libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
727libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
728libs-y := $(libs-y1) $(libs-y2)
729
730# Build vmlinux
731# ---------------------------------------------------------------------------
732# vmlinux is built from the objects selected by $(vmlinux-init) and
733# $(vmlinux-main). Most are built-in.o files from top-level directories
734# in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
735# Ordering when linking is important, and $(vmlinux-init) must be first.
736#
737# vmlinux
738# ^
739# |
740# +-< $(vmlinux-init)
741# | +--< init/version.o + more
742# |
743# +--< $(vmlinux-main)
744# | +--< driver/built-in.o mm/built-in.o + more
745# |
746# +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
747#
748# vmlinux version (uname -v) cannot be updated during normal
749# descending-into-subdirs phase since we do not yet know if we need to
750# update vmlinux.
751# Therefore this step is delayed until just before final link of vmlinux -
752# except in the kallsyms case where it is done just before adding the
753# symbols to the kernel.
754#
755# System.map is generated to document addresses of all kernel symbols
756
757vmlinux-init := $(head-y) $(init-y)
758vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
759vmlinux-all := $(vmlinux-init) $(vmlinux-main)
760vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
761export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
762
763# Rule to link vmlinux - also used during CONFIG_KALLSYMS
764# May be overridden by arch/$(ARCH)/Makefile
765quiet_cmd_vmlinux__ ?= LD $@
766 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
767 -T $(vmlinux-lds) $(vmlinux-init) \
768 --start-group $(vmlinux-main) --end-group \
769 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
770
771# Generate new vmlinux version
772quiet_cmd_vmlinux_version = GEN .version
773 cmd_vmlinux_version = set -e; \
774 if [ ! -r .version ]; then \
775 rm -f .version; \
776 echo 1 >.version; \
777 else \
778 mv .version .old_version; \
779 expr 0$$(cat .old_version) + 1 >.version; \
780 fi; \
781 $(MAKE) $(build)=init
782
783# Generate System.map
784quiet_cmd_sysmap = SYSMAP
785 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
786
787# Link of vmlinux
788# If CONFIG_KALLSYMS is set .version is already updated
789# Generate System.map and verify that the content is consistent
790# Use + in front of the vmlinux_version rule to silent warning with make -j2
791# First command is ':' to allow us to use + in front of the rule
792define rule_vmlinux__
793 :
794 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
795
796 $(call cmd,vmlinux__)
797 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
798
799 $(Q)$(if $($(quiet)cmd_sysmap), \
800 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
801 $(cmd_sysmap) $@ System.map; \
802 if [ $$? -ne 0 ]; then \
803 rm -f $@; \
804 /bin/false; \
805 fi;
806 $(verify_kallsyms)
807endef
808
809
810ifdef CONFIG_KALLSYMS
811# Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
812# It's a three stage process:
813# o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
814# empty
815# Running kallsyms on that gives us .tmp_kallsyms1.o with
816# the right size - vmlinux version (uname -v) is updated during this step
817# o .tmp_vmlinux2 now has a __kallsyms section of the right size,
818# but due to the added section, some addresses have shifted.
819# From here, we generate a correct .tmp_kallsyms2.o
820# o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
821# o Verify that the System.map from vmlinux matches the map from
822# .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
823# o If 'make KALLSYMS_EXTRA_PASS=1" was used, do an extra pass using
824# .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
825# temporary bypass to allow the kernel to be built while the
826# maintainers work out what went wrong with kallsyms.
827
828last_kallsyms := 2
829
830ifdef KALLSYMS_EXTRA_PASS
831ifneq ($(KALLSYMS_EXTRA_PASS),0)
832last_kallsyms := 3
833endif
834endif
835
836kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
837
838define verify_kallsyms
839 $(Q)$(if $($(quiet)cmd_sysmap), \
840 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
841 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
842 $(Q)cmp -s System.map .tmp_System.map || \
843 (echo Inconsistent kallsyms data; \
844 echo This is a bug - please report about it; \
845 echo Try "make KALLSYMS_EXTRA_PASS=1" as a workaround; \
846 rm .tmp_kallsyms* ; /bin/false )
847endef
848
849# Update vmlinux version before link
850# Use + in front of this rule to silent warning about make -j1
851# First command is ':' to allow us to use + in front of this rule
852cmd_ksym_ld = $(cmd_vmlinux__)
853define rule_ksym_ld
854 :
855 +$(call cmd,vmlinux_version)
856 $(call cmd,vmlinux__)
857 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
858endef
859
860# Generate .S file with all kernel symbols
861quiet_cmd_kallsyms = KSYM $@
862 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
863 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
864
865.tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
866 $(call if_changed_dep,as_o_S)
867
868.tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
869 $(call cmd,kallsyms)
870
871# .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
872.tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
873 $(call if_changed_rule,ksym_ld)
874
875.tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
876 $(call if_changed,vmlinux__)
877
878.tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
879 $(call if_changed,vmlinux__)
880
881# Needs to visit scripts before $(KALLSYMS) can be used.
882$(KALLSYMS): scripts ;
883
884# Generate some data for debugging strange kallsyms problems
885debug_kallsyms: .tmp_map$(last_kallsyms)
886
887.tmp_map%: .tmp_vmlinux% FORCE
888 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
889
890.tmp_map3: .tmp_map2
891
892.tmp_map2: .tmp_map1
893
894endif # ifdef CONFIG_KALLSYMS
895
896# Do modpost on a prelinked vmlinux. The finally linked vmlinux has
897# relevant sections renamed as per the linker script.
898quiet_cmd_vmlinux-modpost = LD $@
899 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
900 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
901 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
902define rule_vmlinux-modpost
903 :
904 +$(call cmd,vmlinux-modpost)
905 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
906 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
907endef
908
909# vmlinux image - including updated kernel symbols
910vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) __KEEPMAKEFILEO__I.o $(kallsyms.o) FORCE
911ifdef CONFIG_HEADERS_CHECK
912 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
913endif
914ifdef CONFIG_SAMPLES
915 $(Q)$(MAKE) $(build)=samples
916endif
917ifdef CONFIG_BUILD_DOCSRC
918 $(Q)$(MAKE) $(build)=Documentation
919endif
920 $(call vmlinux-modpost)
921 $(call if_changed_rule,vmlinux__)
922 $(Q)rm -f .old_version
923
924# build vmlinux.o first to catch section mismatch errors early
925ifdef CONFIG_KALLSYMS
926.tmp_vmlinux1: __KEEPMAKEFILEO__BA.o
927endif
928
929modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
930vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
931 $(call if_changed_rule,vmlinux-modpost)
932
933# The actual objects are generated when descending,
934# make sure no implicit rule kicks in
935$(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
936
937# Handle descending into subdirectories listed in $(vmlinux-dirs)
938# Preset locale variables to speed up the build process. Limit locale
939# tweaks to this spot to avoid wrong language settings when running
940# make menuconfig etc.
941# Error messages still appears in the original language
942
943PHONY += $(vmlinux-dirs)
944$(vmlinux-dirs): prepare scripts
945 $(Q)$(MAKE) $(build)=$@
946
947# Store (new) KERNELRELASE string in include/config/kernel.release
948include/config/kernel.release: include/config/auto.conf FORCE
949 $(Q)rm -f $@
950 $(Q)echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))" > $@
951
952
953# Things we need to do before we recursively start building the kernel
954# or the modules are listed in "prepare".
955# A multi level approach is used. prepareN is processed before prepareN-1.
956# archprepare is used in arch Makefiles and when processed asm symlink,
957# version.h and scripts_basic is processed / created.
958
959# Listed in dependency order
960PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
961
962# prepare3 is used to check if we are building in a separate output directory,
963# and if so do:
964# 1) Check that make has not been executed in the kernel src $(srctree)
965prepare3: include/config/kernel.release
966ifneq ($(KBUILD_SRC),)
967 @$(kecho) ' Using $(srctree) as source for kernel'
968 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
969 echo " $(srctree) is not clean, please run 'make mrproper'";\
970 echo " in the '$(srctree)' directory.";\
971 /bin/false; \
972 fi;
973endif
974
975# prepare2 creates a makefile if using a separate output directory
976prepare2: prepare3 outputmakefile asm-generic
977
978prepare1: prepare2 include/linux/version.h include/generated/utsrelease.h \
979 include/config/auto.conf
980 $(cmd_crmodverdir)
981
982archprepare: prepare1 scripts_basic
983
984prepare0: archprepare FORCE
985 $(Q)$(MAKE) $(build)=.
986 $(Q)$(MAKE) $(build)=. missing-syscalls
987
988# All the preparing..
989prepare: prepare0
990
991# Generate some files
992# ---------------------------------------------------------------------------
993
994# KERNELRELEASE can change from a few different places, meaning version.h
995# needs to be updated, so this check is forced on all builds
996
997uts_len := 64
998define filechk_utsrelease.h
999 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1000 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1001 exit 1; \
1002 fi; \
1003 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1004endef
1005
1006define filechk_version.h
1007 (echo \#define LINUX_VERSION_CODE $(shell \
1008 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1009 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1010endef
1011
1012include/linux/version.h: $(srctree)/Makefile FORCE
1013 $(call filechk,version.h)
1014
1015include/generated/utsrelease.h: include/config/kernel.release FORCE
1016 $(call filechk,utsrelease.h)
1017
1018PHONY += headerdep
1019headerdep:
1020 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1021 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1022
1023# ---------------------------------------------------------------------------
1024
1025PHONY += depend dep
1026depend dep:
1027 @echo '*** Warning: make $@ is unnecessary now.'
1028
1029# ---------------------------------------------------------------------------
1030# Firmware install
1031INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1032export INSTALL_FW_PATH
1033
1034PHONY += firmware_install
1035firmware_install: FORCE
1036 @mkdir -p $(objtree)/firmware
1037 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1038
1039# ---------------------------------------------------------------------------
1040# Kernel headers
1041
1042#Default location for installed headers
1043export INSTALL_HDR_PATH = $(objtree)/usr
1044
1045hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1046
1047# If we do an all arch process set dst to asm-$(hdr-arch)
1048hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1049
1050PHONY += __headers
1051__headers: include/linux/version.h scripts_basic asm-generic FORCE
1052 $(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild),, \
1061 $(error Headers not exportable for the $(SRCARCH) architecture))
1062 $(Q)$(MAKE) $(hdr-inst)=include
1063 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1072 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Modules
1076
1077ifdef CONFIG_MODULES
1078
1079# By default, build modules as well
1080
1081all: modules
1082
1083# Build modules
1084#
1085# A module can be listed more than once in obj-m resulting in
1086# duplicate lines in modules.order files. Those are removed
1087# using awk while concatenating to the final file.
1088
1089PHONY += modules
1090modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1091 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1092 @$(kecho) ' Building modules, stage 2.';
1093 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1094 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1095
1096modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1097 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1098
1099%/modules.builtin: include/config/auto.conf
1100 $(Q)$(MAKE) $(modbuiltin)=$*
1101
1102
1103# Target to prepare building external modules
1104PHONY += modules_prepare
1105modules_prepare: prepare scripts
1106
1107# Target to install modules
1108PHONY += modules_install
1109modules_install: _modinst_ _modinst_post
1110
1111PHONY += _modinst_
1112_modinst_:
1113 @rm -rf $(MODLIB)/kernel
1114 @rm -f $(MODLIB)/source
1115 @mkdir -p $(MODLIB)/kernel
1116 @ln -s $(srctree) $(MODLIB)/source
1117 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1118 rm -f $(MODLIB)/build ; \
1119 ln -s $(objtree) $(MODLIB)/build ; \
1120 fi
1121 @cp -f $(objtree)/modules.order $(MODLIB)/
1122 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1123 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1124
1125# This depmod is only for convenience to give the initial
1126# boot a modules.dep even before / is mounted read-write. However the
1127# boot script depmod is the master version.
1128PHONY += _modinst_post
1129_modinst_post: _modinst_
1130 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1131 $(call cmd,depmod)
1132
1133else # CONFIG_MODULES
1134
1135# Modules not configured
1136# ---------------------------------------------------------------------------
1137
1138modules modules_install: FORCE
1139 @echo
1140 @echo "The present kernel configuration has modules disabled."
1141 @echo "Type 'make config' and enable loadable module support."
1142 @echo "Then build a kernel with module support enabled."
1143 @echo
1144 @exit 1
1145
1146endif # CONFIG_MODULES
1147
1148###
1149# Cleaning is done on three levels.
1150# make clean Delete most generated files
1151# Leave enough to build external modules
1152# make mrproper Delete the current configuration, and all generated files
1153# make distclean Remove editor backup files, patch leftover files and the like
1154
1155# Directories & files removed with 'make clean'
1156CLEAN_DIRS += $(MODVERDIR)
1157CLEAN_FILES += vmlinux System.map \
1158 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1159
1160# Directories & files removed with 'make mrproper'
1161MRPROPER_DIRS += include/config usr/include include/generated \
1162 arch/*/include/generated
1163MRPROPER_FILES += .config .config.old .version .old_version \
1164 include/linux/version.h \
1165 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1166
1167# clean - Delete most, but leave enough to build external modules
1168#
1169clean: rm-dirs := $(CLEAN_DIRS)
1170clean: rm-files := $(CLEAN_FILES)
1171clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation)
1172
1173PHONY += $(clean-dirs) clean archclean
1174$(clean-dirs):
1175 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1176
1177clean: archclean
1178
1179# mrproper - Delete all generated files, including .config
1180#
1181mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1182mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1183mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1184
1185PHONY += $(mrproper-dirs) mrproper archmrproper
1186$(mrproper-dirs):
1187 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1188
1189mrproper: clean archmrproper $(mrproper-dirs)
1190 $(call cmd,rmdirs)
1191 $(call cmd,rmfiles)
1192
1193# distclean
1194#
1195PHONY += distclean
1196
1197distclean: mrproper
1198 @find $(srctree) $(RCS_FIND_IGNORE) \
1199 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1200 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1201 -o -name '.*.rej' -o -size 0 \
1202 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1203 -type f -print | xargs rm -f
1204
1205
1206# Packaging of the kernel to various formats
1207# ---------------------------------------------------------------------------
1208# rpm target kept for backward compatibility
1209package-dir := $(srctree)/scripts/package
1210
1211%src-pkg: FORCE
1212 $(Q)$(MAKE) $(build)=$(package-dir) $@
1213%pkg: include/config/kernel.release FORCE
1214 $(Q)$(MAKE) $(build)=$(package-dir) $@
1215rpm: include/config/kernel.release FORCE
1216 $(Q)$(MAKE) $(build)=$(package-dir) $@
1217
1218
1219# Brief documentation of the typical targets used
1220# ---------------------------------------------------------------------------
1221
1222boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1223boards := $(notdir $(boards))
1224board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1225board-dirs := $(sort $(notdir $(board-dirs:/=)))
1226
1227help:
1228 @echo 'Cleaning targets:'
1229 @echo ' clean - Remove most generated files but keep the config and'
1230 @echo ' enough build support to build external modules'
1231 @echo ' mrproper - Remove all generated files + config + various backup files'
1232 @echo ' distclean - mrproper + remove editor backup and patch files'
1233 @echo ''
1234 @echo 'Configuration targets:'
1235 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1236 @echo ''
1237 @echo 'Other generic targets:'
1238 @echo ' all - Build all targets marked with [*]'
1239 @echo '* vmlinux - Build the bare kernel'
1240 @echo '* modules - Build all modules'
1241 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1242 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1243 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1244 @echo ' dir/ - Build all files in dir and below'
1245 @echo ' dir/file.[oisS] - Build specified target only'
1246 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1247 @echo ' (requires a recent binutils and recent build (System.map))'
1248 @echo ' dir/file.ko - Build module including final link'
1249 @echo ' modules_prepare - Set up for building external modules'
1250 @echo ' tags/TAGS - Generate tags file for editors'
1251 @echo ' cscope - Generate cscope index'
1252 @echo ' gtags - Generate GNU GLOBAL index'
1253 @echo ' kernelrelease - Output the release version string'
1254 @echo ' kernelversion - Output the version stored in Makefile'
1255 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1256 echo ' (default: $(INSTALL_HDR_PATH))'; \
1257 echo ''
1258 @echo 'Static analysers'
1259 @echo ' checkstack - Generate a list of stack hogs'
1260 @echo ' namespacecheck - Name space analysis on compiled kernel'
1261 @echo ' versioncheck - Sanity check on version.h usage'
1262 @echo ' includecheck - Check for duplicate included header files'
1263 @echo ' export_report - List the usages of all exported symbols'
1264 @echo ' headers_check - Sanity check on exported headers'
1265 @echo ' headerdep - Detect inclusion cycles in headers'
1266 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1267 @echo ''
1268 @echo 'Kernel packaging:'
1269 @$(MAKE) $(build)=$(package-dir) help
1270 @echo ''
1271 @echo 'Documentation targets:'
1272 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1273 @echo ''
1274 @echo 'Architecture specific targets ($(SRCARCH)):'
1275 @$(if $(archhelp),$(archhelp),\
1276 echo ' No architecture specific help defined for $(SRCARCH)')
1277 @echo ''
1278 @$(if $(boards), \
1279 $(foreach b, $(boards), \
1280 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1281 echo '')
1282 @$(if $(board-dirs), \
1283 $(foreach b, $(board-dirs), \
1284 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1285 printf " %-16s - Show all of the above\\n" help-boards; \
1286 echo '')
1287
1288 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1289 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1290 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1291 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1292 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1293 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1294 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1295 @echo ' 1: warnings which may be relevant and do not occur too often'
1296 @echo ' 2: warnings which occur quite often but may still be relevant'
1297 @echo ' 3: more obscure warnings, can most likely be ignored'
1298 @echo ' Multiple levels can be combined with W=12 or W=123'
1299 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1300 @echo ''
1301 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1302 @echo 'For further info see the ./README file'
1303
1304
1305help-board-dirs := $(addprefix help-,$(board-dirs))
1306
1307help-boards: $(help-board-dirs)
1308
1309boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1310
1311$(help-board-dirs): help-%:
1312 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1313 @$(if $(boards-per-dir), \
1314 $(foreach b, $(boards-per-dir), \
1315 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1316 echo '')
1317
1318
1319# Documentation targets
1320# ---------------------------------------------------------------------------
1321%docs: scripts_basic FORCE
1322 $(Q)$(MAKE) $(build)=scripts build_docproc
1323 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1324
1325else # KBUILD_EXTMOD
1326
1327###
1328# External module support.
1329# When building external modules the kernel used as basis is considered
1330# read-only, and no consistency checks are made and the make
1331# system is not used on the basis kernel. If updates are required
1332# in the basis kernel ordinary make commands (without M=...) must
1333# be used.
1334#
1335# The following are the only valid targets when building external
1336# modules.
1337# make M=dir clean Delete all automatically generated files
1338# make M=dir modules Make all modules in specified dir
1339# make M=dir Same as 'make M=dir modules'
1340# make M=dir modules_install
1341# Install the modules built in the module directory
1342# Assumes install directory is already created
1343
1344# We are always building modules
1345KBUILD_MODULES := 1
1346PHONY += crmodverdir
1347crmodverdir:
1348 $(cmd_crmodverdir)
1349
1350PHONY += $(objtree)/Module.symvers
1351$(objtree)/Module.symvers:
1352 @test -e $(objtree)/Module.symvers || ( \
1353 echo; \
1354 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1355 echo " is missing; modules will have no dependencies and modversions."; \
1356 echo )
1357
1358module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1359PHONY += $(module-dirs) modules
1360$(module-dirs): crmodverdir $(objtree)/Module.symvers
1361 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1362
1363modules: $(module-dirs)
1364 @$(kecho) ' Building modules, stage 2.';
1365 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1366
1367PHONY += modules_install
1368modules_install: _emodinst_ _emodinst_post
1369
1370install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1371PHONY += _emodinst_
1372_emodinst_:
1373 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1374 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1375
1376PHONY += _emodinst_post
1377_emodinst_post: _emodinst_
1378 $(call cmd,depmod)
1379
1380clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1381
1382PHONY += $(clean-dirs) clean
1383$(clean-dirs):
1384 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1385
1386clean: rm-dirs := $(MODVERDIR)
1387clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1388
1389help:
1390 @echo ' Building external modules.'
1391 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1392 @echo ''
1393 @echo ' modules - default target, build the module(s)'
1394 @echo ' modules_install - install the module'
1395 @echo ' clean - remove generated files in module directory only'
1396 @echo ''
1397
1398# Dummies...
1399PHONY += prepare scripts
1400prepare: ;
1401scripts: ;
1402endif # KBUILD_EXTMOD
1403
1404clean: $(clean-dirs)
1405 $(call cmd,rmdirs)
1406 $(call cmd,rmfiles)
1407 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1408 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1409 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1410 -o -name '*.symtypes' -o -name 'modules.order' \
1411 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1412 -o -name '*.gcno' \) -type f -print | xargs rm -f
1413
1414# Generate tags for editors
1415# ---------------------------------------------------------------------------
1416quiet_cmd_tags = GEN $@
1417 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1418
1419tags TAGS cscope gtags: FORCE
1420 $(call cmd,tags)
1421
1422# Scripts to check various things for consistency
1423# ---------------------------------------------------------------------------
1424
1425PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1426
1427includecheck:
1428 find $(srctree)/* $(RCS_FIND_IGNORE) \
1429 -name '*.[hcS]' -type f -print | sort \
1430 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1431
1432versioncheck:
1433 find $(srctree)/* $(RCS_FIND_IGNORE) \
1434 -name '*.[hcS]' -type f -print | sort \
1435 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1436
1437coccicheck:
1438 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1439
1440namespacecheck:
1441 $(PERL) $(srctree)/scripts/namespace.pl
1442
1443export_report:
1444 $(PERL) $(srctree)/scripts/export_report.pl
1445
1446endif #ifeq ($(config-targets),1)
1447endif #ifeq ($(mixed-targets),1)
1448
1449PHONY += checkstack kernelrelease kernelversion
1450
1451# UML needs a little special treatment here. It wants to use the host
1452# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1453# else wants $(ARCH), including people doing cross-builds, which means
1454# that $(SUBARCH) doesn't work here.
1455ifeq ($(ARCH), um)
1456CHECKSTACK_ARCH := $(SUBARCH)
1457else
1458CHECKSTACK_ARCH := $(ARCH)
1459endif
1460checkstack:
1461 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1462 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1463
1464kernelrelease:
1465 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1466
1467kernelversion:
1468 @echo $(KERNELVERSION)
1469
1470# Single targets
1471# ---------------------------------------------------------------------------
1472# Single targets are compatible with:
1473# - build with mixed source and output
1474# - build with separate output dir 'make O=...'
1475# - external modules
1476#
1477# target-dir => where to store outputfile
1478# build-dir => directory in kernel source tree to use
1479
1480ifeq ($(KBUILD_EXTMOD),)
1481 build-dir = $(patsubst %/,%,$(dir $@))
1482 target-dir = $(dir $@)
1483else
1484 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1485 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1486 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1487endif
1488
1489%.s: %.c prepare scripts FORCE
1490 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1491%.i: %.c prepare scripts FORCE
1492 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1493%.o: %.c prepare scripts FORCE
1494 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1495%.lst: %.c prepare scripts FORCE
1496 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1497%.s: %.S prepare scripts FORCE
1498 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1499%.o: %.S prepare scripts FORCE
1500 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1501%.symtypes: %.c prepare scripts FORCE
1502 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1503
1504# Modules
1505/: prepare scripts FORCE
1506 $(cmd_crmodverdir)
1507 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1508 $(build)=$(build-dir)
1509%/: prepare scripts FORCE
1510 $(cmd_crmodverdir)
1511 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1512 $(build)=$(build-dir)
1513%.ko: prepare scripts FORCE
1514 $(cmd_crmodverdir)
1515 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1516 $(build)=$(build-dir) $(@:.ko=.o)
1517 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1518
1519# FIXME Should go into a make.lib or something
1520# ===========================================================================
1521
1522quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1523 cmd_rmdirs = rm -rf $(rm-dirs)
1524
1525quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1526 cmd_rmfiles = rm -f $(rm-files)
1527
1528# Run depmod only if we have System.map and depmod is executable
1529quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1530 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1531 $(KERNELRELEASE)
1532
1533# Create temporary dir for module support files
1534# clean it up only when building all modules
1535cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1536 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1537
1538a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1539 $(KBUILD_AFLAGS_KERNEL) \
1540 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1541 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1542
1543quiet_cmd_as_o_S = AS $@
1544cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1545
1546# read all saved command lines
1547
1548targets := $(wildcard $(sort $(targets)))
1549cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1550
1551ifneq ($(cmd_files),)
1552 $(cmd_files): ; # Do not try to update included dependency files
1553 include $(cmd_files)
1554endif
1555
1556# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1557# Usage:
1558# $(Q)$(MAKE) $(clean)=dir
1559clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1560
1561endif # skip-makefile
1562
1563PHONY += FORCE
1564FORCE:
1565
1566# Declare the contents of the .PHONY variable as phony. We keep that
1567# information in a variable so we can use it in if_changed and friends.
1568.PHONY: $(PHONY)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 5
3PATCHLEVEL = 4
4SUBLEVEL = 0
5EXTRAVERSION =
6NAME = Kleptomaniac Octopus
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# We are using a recursive build, so we need to do a little thinking
19# to get the ordering right.
20#
21# Most importantly: sub-Makefiles should only ever modify files in
22# their own directory. If in some directory we have a dependency on
23# a file in another dir (which doesn't happen often, but it's often
24# unavoidable when linking the built-in.a targets which finally
25# turn into vmlinux), we will call a sub make in that other dir, and
26# after that we are sure that everything which is in that other dir
27# is now up to date.
28#
29# The only cases where we need to modify files which have global
30# effects are thus separated out and done before the recursive
31# descending is started. They are now explicitly listed as the
32# prepare rule.
33
34ifneq ($(sub_make_done),1)
35
36# Do not use make's built-in rules and variables
37# (this increases performance and avoids hard-to-debug behaviour)
38MAKEFLAGS += -rR
39
40# Avoid funny character set dependencies
41unexport LC_ALL
42LC_COLLATE=C
43LC_NUMERIC=C
44export LC_COLLATE LC_NUMERIC
45
46# Avoid interference with shell env settings
47unexport GREP_OPTIONS
48
49# Beautify output
50# ---------------------------------------------------------------------------
51#
52# Normally, we echo the whole command before executing it. By making
53# that echo $($(quiet)$(cmd)), we now have the possibility to set
54# $(quiet) to choose other forms of output instead, e.g.
55#
56# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
57# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
58#
59# If $(quiet) is empty, the whole command will be printed.
60# If it is set to "quiet_", only the short version will be printed.
61# If it is set to "silent_", nothing will be printed at all, since
62# the variable $(silent_cmd_cc_o_c) doesn't exist.
63#
64# A simple variant is to prefix commands with $(Q) - that's useful
65# for commands that shall be hidden in non-verbose mode.
66#
67# $(Q)ln $@ :<
68#
69# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
70# If KBUILD_VERBOSE equals 1 then the above command is displayed.
71#
72# To put more focus on warnings, be less verbose as default
73# Use 'make V=1' to see the full commands
74
75ifeq ("$(origin V)", "command line")
76 KBUILD_VERBOSE = $(V)
77endif
78ifndef KBUILD_VERBOSE
79 KBUILD_VERBOSE = 0
80endif
81
82ifeq ($(KBUILD_VERBOSE),1)
83 quiet =
84 Q =
85else
86 quiet=quiet_
87 Q = @
88endif
89
90# If the user is running make -s (silent mode), suppress echoing of
91# commands
92
93ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
94 quiet=silent_
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# Kbuild will save output files in the current working directory.
100# This does not need to match to the root of the kernel source tree.
101#
102# For example, you can do this:
103#
104# cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
105#
106# If you want to save output files in a different location, there are
107# two syntaxes to specify it.
108#
109# 1) O=
110# Use "make O=dir/to/store/output/files/"
111#
112# 2) Set KBUILD_OUTPUT
113# Set the environment variable KBUILD_OUTPUT to point to the output directory.
114# export KBUILD_OUTPUT=dir/to/store/output/files/; make
115#
116# The O= assignment takes precedence over the KBUILD_OUTPUT environment
117# variable.
118
119# Do we want to change the working directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124ifneq ($(KBUILD_OUTPUT),)
125# Make's built-in functions such as $(abspath ...), $(realpath ...) cannot
126# expand a shell special character '~'. We use a somewhat tedious way here.
127abs_objtree := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) && pwd)
128$(if $(abs_objtree),, \
129 $(error failed to create output directory "$(KBUILD_OUTPUT)"))
130
131# $(realpath ...) resolves symlinks
132abs_objtree := $(realpath $(abs_objtree))
133else
134abs_objtree := $(CURDIR)
135endif # ifneq ($(KBUILD_OUTPUT),)
136
137ifeq ($(abs_objtree),$(CURDIR))
138# Suppress "Entering directory ..." unless we are changing the work directory.
139MAKEFLAGS += --no-print-directory
140else
141need-sub-make := 1
142endif
143
144abs_srctree := $(realpath $(dir $(lastword $(MAKEFILE_LIST))))
145
146ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
147$(error source directory cannot contain spaces or colons)
148endif
149
150ifneq ($(abs_srctree),$(abs_objtree))
151# Look for make include files relative to root of kernel src
152#
153# This does not become effective immediately because MAKEFLAGS is re-parsed
154# once after the Makefile is read. We need to invoke sub-make.
155MAKEFLAGS += --include-dir=$(abs_srctree)
156need-sub-make := 1
157endif
158
159ifneq ($(filter 3.%,$(MAKE_VERSION)),)
160# 'MAKEFLAGS += -rR' does not immediately become effective for GNU Make 3.x
161# We need to invoke sub-make to avoid implicit rules in the top Makefile.
162need-sub-make := 1
163# Cancel implicit rules for this Makefile.
164$(lastword $(MAKEFILE_LIST)): ;
165endif
166
167export abs_srctree abs_objtree
168export sub_make_done := 1
169
170ifeq ($(need-sub-make),1)
171
172PHONY += $(MAKECMDGOALS) sub-make
173
174$(filter-out _all sub-make $(lastword $(MAKEFILE_LIST)), $(MAKECMDGOALS)) _all: sub-make
175 @:
176
177# Invoke a second make in the output directory, passing relevant variables
178sub-make:
179 $(Q)$(MAKE) -C $(abs_objtree) -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
180
181endif # need-sub-make
182endif # sub_make_done
183
184# We process the rest of the Makefile if this is the final invocation of make
185ifeq ($(need-sub-make),)
186
187# Do not print "Entering directory ...",
188# but we want to display it when entering to the output directory
189# so that IDEs/editors are able to understand relative filenames.
190MAKEFLAGS += --no-print-directory
191
192# Call a source code checker (by default, "sparse") as part of the
193# C compilation.
194#
195# Use 'make C=1' to enable checking of only re-compiled files.
196# Use 'make C=2' to enable checking of *all* source files, regardless
197# of whether they are re-compiled or not.
198#
199# See the file "Documentation/dev-tools/sparse.rst" for more details,
200# including where to get the "sparse" utility.
201
202ifeq ("$(origin C)", "command line")
203 KBUILD_CHECKSRC = $(C)
204endif
205ifndef KBUILD_CHECKSRC
206 KBUILD_CHECKSRC = 0
207endif
208
209# Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
210# directory of external module to build. Setting M= takes precedence.
211ifeq ("$(origin M)", "command line")
212 KBUILD_EXTMOD := $(M)
213endif
214
215export KBUILD_CHECKSRC KBUILD_EXTMOD
216
217extmod-prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
218
219ifeq ($(abs_srctree),$(abs_objtree))
220 # building in the source tree
221 srctree := .
222 building_out_of_srctree :=
223else
224 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
225 # building in a subdirectory of the source tree
226 srctree := ..
227 else
228 srctree := $(abs_srctree)
229 endif
230 building_out_of_srctree := 1
231endif
232
233ifneq ($(KBUILD_ABS_SRCTREE),)
234srctree := $(abs_srctree)
235endif
236
237objtree := .
238VPATH := $(srctree)
239
240export building_out_of_srctree srctree objtree VPATH
241
242# To make sure we do not include .config for any of the *config targets
243# catch them early, and hand them over to scripts/kconfig/Makefile
244# It is allowed to specify more targets when calling make, including
245# mixing *config targets and build targets.
246# For example 'make oldconfig all'.
247# Detect when mixed targets is specified, and make a second invocation
248# of make so .config is not included in this case either (for *config).
249
250version_h := include/generated/uapi/linux/version.h
251old_version_h := include/linux/version.h
252
253clean-targets := %clean mrproper cleandocs
254no-dot-config-targets := $(clean-targets) \
255 cscope gtags TAGS tags help% %docs check% coccicheck \
256 $(version_h) headers headers_% archheaders archscripts \
257 %asm-generic kernelversion %src-pkg
258no-sync-config-targets := $(no-dot-config-targets) install %install \
259 kernelrelease
260single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.s %.symtypes %/
261
262config-build :=
263mixed-build :=
264need-config := 1
265may-sync-config := 1
266single-build :=
267
268ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
269 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
270 need-config :=
271 endif
272endif
273
274ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
275 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
276 may-sync-config :=
277 endif
278endif
279
280ifneq ($(KBUILD_EXTMOD),)
281 may-sync-config :=
282endif
283
284ifeq ($(KBUILD_EXTMOD),)
285 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
286 config-build := 1
287 ifneq ($(words $(MAKECMDGOALS)),1)
288 mixed-build := 1
289 endif
290 endif
291endif
292
293# We cannot build single targets and the others at the same time
294ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
295 single-build := 1
296 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
297 mixed-build := 1
298 endif
299endif
300
301# For "make -j clean all", "make -j mrproper defconfig all", etc.
302ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
303 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
304 mixed-build := 1
305 endif
306endif
307
308# install and modules_install need also be processed one by one
309ifneq ($(filter install,$(MAKECMDGOALS)),)
310 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
311 mixed-build := 1
312 endif
313endif
314
315ifdef mixed-build
316# ===========================================================================
317# We're called with mixed targets (*config and build targets).
318# Handle them one by one.
319
320PHONY += $(MAKECMDGOALS) __build_one_by_one
321
322$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
323 @:
324
325__build_one_by_one:
326 $(Q)set -e; \
327 for i in $(MAKECMDGOALS); do \
328 $(MAKE) -f $(srctree)/Makefile $$i; \
329 done
330
331else # !mixed-build
332
333include scripts/Kbuild.include
334
335# Read KERNELRELEASE from include/config/kernel.release (if it exists)
336KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
337KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
338export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
339
340include scripts/subarch.include
341
342# Cross compiling and selecting different set of gcc/bin-utils
343# ---------------------------------------------------------------------------
344#
345# When performing cross compilation for other architectures ARCH shall be set
346# to the target architecture. (See arch/* for the possibilities).
347# ARCH can be set during invocation of make:
348# make ARCH=ia64
349# Another way is to have ARCH set in the environment.
350# The default ARCH is the host where make is executed.
351
352# CROSS_COMPILE specify the prefix used for all executables used
353# during compilation. Only gcc and related bin-utils executables
354# are prefixed with $(CROSS_COMPILE).
355# CROSS_COMPILE can be set on the command line
356# make CROSS_COMPILE=ia64-linux-
357# Alternatively CROSS_COMPILE can be set in the environment.
358# Default value for CROSS_COMPILE is not to prefix executables
359# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
360ARCH ?= $(SUBARCH)
361
362# Architecture as present in compile.h
363UTS_MACHINE := $(ARCH)
364SRCARCH := $(ARCH)
365
366# Additional ARCH settings for x86
367ifeq ($(ARCH),i386)
368 SRCARCH := x86
369endif
370ifeq ($(ARCH),x86_64)
371 SRCARCH := x86
372endif
373
374# Additional ARCH settings for sparc
375ifeq ($(ARCH),sparc32)
376 SRCARCH := sparc
377endif
378ifeq ($(ARCH),sparc64)
379 SRCARCH := sparc
380endif
381
382# Additional ARCH settings for sh
383ifeq ($(ARCH),sh64)
384 SRCARCH := sh
385endif
386
387KCONFIG_CONFIG ?= .config
388export KCONFIG_CONFIG
389
390# SHELL used by kbuild
391CONFIG_SHELL := sh
392
393HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
394HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
395HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
396
397HOSTCC = gcc
398HOSTCXX = g++
399KBUILD_HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
400 -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS) \
401 $(HOSTCFLAGS)
402KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
403KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
404KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
405
406# Make variables (CC, etc...)
407AS = $(CROSS_COMPILE)as
408LD = $(CROSS_COMPILE)ld
409CC = $(CROSS_COMPILE)gcc
410CPP = $(CC) -E
411AR = $(CROSS_COMPILE)ar
412NM = $(CROSS_COMPILE)nm
413STRIP = $(CROSS_COMPILE)strip
414OBJCOPY = $(CROSS_COMPILE)objcopy
415OBJDUMP = $(CROSS_COMPILE)objdump
416OBJSIZE = $(CROSS_COMPILE)size
417PAHOLE = pahole
418LEX = flex
419YACC = bison
420AWK = awk
421INSTALLKERNEL := installkernel
422DEPMOD = /sbin/depmod
423PERL = perl
424PYTHON = python
425PYTHON2 = python2
426PYTHON3 = python3
427CHECK = sparse
428BASH = bash
429
430CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
431 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
432NOSTDINC_FLAGS :=
433CFLAGS_MODULE =
434AFLAGS_MODULE =
435LDFLAGS_MODULE =
436CFLAGS_KERNEL =
437AFLAGS_KERNEL =
438LDFLAGS_vmlinux =
439
440# Use USERINCLUDE when you must reference the UAPI directories only.
441USERINCLUDE := \
442 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
443 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
444 -I$(srctree)/include/uapi \
445 -I$(objtree)/include/generated/uapi \
446 -include $(srctree)/include/linux/kconfig.h
447
448# Use LINUXINCLUDE when you must reference the include directory.
449# Needed to be compatible with the O= option
450LINUXINCLUDE := \
451 -I$(srctree)/arch/$(SRCARCH)/include \
452 -I$(objtree)/arch/$(SRCARCH)/include/generated \
453 $(if $(building_out_of_srctree),-I$(srctree)/include) \
454 -I$(objtree)/include \
455 $(USERINCLUDE)
456
457KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
458KBUILD_CFLAGS := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
459 -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
460 -Werror=implicit-function-declaration -Werror=implicit-int \
461 -Wno-format-security \
462 -std=gnu89
463KBUILD_CPPFLAGS := -D__KERNEL__
464KBUILD_AFLAGS_KERNEL :=
465KBUILD_CFLAGS_KERNEL :=
466KBUILD_AFLAGS_MODULE := -DMODULE
467KBUILD_CFLAGS_MODULE := -DMODULE
468KBUILD_LDFLAGS_MODULE :=
469export KBUILD_LDS_MODULE := $(srctree)/scripts/module-common.lds
470KBUILD_LDFLAGS :=
471GCC_PLUGINS_CFLAGS :=
472CLANG_FLAGS :=
473
474export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
475export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
476export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
477export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
478
479export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
480export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
481export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
482export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
483export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
484export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
485
486# Files to ignore in find ... statements
487
488export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
489 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
490 -prune -o
491export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
492 --exclude CVS --exclude .pc --exclude .hg --exclude .git
493
494# ===========================================================================
495# Rules shared between *config targets and build targets
496
497# Basic helpers built in scripts/basic
498PHONY += scripts_basic
499scripts_basic:
500 $(Q)$(MAKE) $(build)=scripts/basic
501 $(Q)rm -f .tmp_quiet_recordmcount
502
503PHONY += outputmakefile
504# Before starting out-of-tree build, make sure the source tree is clean.
505# outputmakefile generates a Makefile in the output directory, if using a
506# separate output directory. This allows convenient use of make in the
507# output directory.
508# At the same time when output Makefile generated, generate .gitignore to
509# ignore whole output directory
510outputmakefile:
511ifdef building_out_of_srctree
512 $(Q)if [ -f $(srctree)/.config -o \
513 -d $(srctree)/include/config -o \
514 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
515 echo >&2 "***"; \
516 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
517 echo >&2 "*** in $(abs_srctree)";\
518 echo >&2 "***"; \
519 false; \
520 fi
521 $(Q)ln -fsn $(srctree) source
522 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile $(srctree)
523 $(Q)test -e .gitignore || \
524 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
525endif
526
527ifneq ($(shell $(CC) --version 2>&1 | head -n 1 | grep clang),)
528ifneq ($(CROSS_COMPILE),)
529CLANG_FLAGS += --target=$(notdir $(CROSS_COMPILE:%-=%))
530GCC_TOOLCHAIN_DIR := $(dir $(shell which $(CROSS_COMPILE)elfedit))
531CLANG_FLAGS += --prefix=$(GCC_TOOLCHAIN_DIR)
532GCC_TOOLCHAIN := $(realpath $(GCC_TOOLCHAIN_DIR)/..)
533endif
534ifneq ($(GCC_TOOLCHAIN),)
535CLANG_FLAGS += --gcc-toolchain=$(GCC_TOOLCHAIN)
536endif
537ifeq ($(shell $(AS) --version 2>&1 | head -n 1 | grep clang),)
538CLANG_FLAGS += -no-integrated-as
539endif
540CLANG_FLAGS += -Werror=unknown-warning-option
541KBUILD_CFLAGS += $(CLANG_FLAGS)
542KBUILD_AFLAGS += $(CLANG_FLAGS)
543export CLANG_FLAGS
544endif
545
546# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
547# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
548# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
549# and from include/config/auto.conf.cmd to detect the compiler upgrade.
550CC_VERSION_TEXT = $(shell $(CC) --version 2>/dev/null | head -n 1)
551
552ifdef config-build
553# ===========================================================================
554# *config targets only - make sure prerequisites are updated, and descend
555# in scripts/kconfig to make the *config target
556
557# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
558# KBUILD_DEFCONFIG may point out an alternative default configuration
559# used for 'make defconfig'
560include arch/$(SRCARCH)/Makefile
561export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
562
563config: outputmakefile scripts_basic FORCE
564 $(Q)$(MAKE) $(build)=scripts/kconfig $@
565
566%config: outputmakefile scripts_basic FORCE
567 $(Q)$(MAKE) $(build)=scripts/kconfig $@
568
569else #!config-build
570# ===========================================================================
571# Build targets only - this includes vmlinux, arch specific targets, clean
572# targets and others. In general all targets except *config targets.
573
574# If building an external module we do not care about the all: rule
575# but instead _all depend on modules
576PHONY += all
577ifeq ($(KBUILD_EXTMOD),)
578_all: all
579else
580_all: modules
581endif
582
583# Decide whether to build built-in, modular, or both.
584# Normally, just do built-in.
585
586KBUILD_MODULES :=
587KBUILD_BUILTIN := 1
588
589# If we have only "make modules", don't compile built-in objects.
590# When we're building modules with modversions, we need to consider
591# the built-in objects during the descend as well, in order to
592# make sure the checksums are up to date before we record them.
593
594ifeq ($(MAKECMDGOALS),modules)
595 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
596endif
597
598# If we have "make <whatever> modules", compile modules
599# in addition to whatever we do anyway.
600# Just "make" or "make all" shall build modules as well
601
602ifneq ($(filter all _all modules nsdeps,$(MAKECMDGOALS)),)
603 KBUILD_MODULES := 1
604endif
605
606ifeq ($(MAKECMDGOALS),)
607 KBUILD_MODULES := 1
608endif
609
610export KBUILD_MODULES KBUILD_BUILTIN
611
612ifdef need-config
613include include/config/auto.conf
614endif
615
616ifeq ($(KBUILD_EXTMOD),)
617# Objects we will link into vmlinux / subdirs we need to visit
618init-y := init
619drivers-y := drivers sound
620drivers-$(CONFIG_SAMPLES) += samples
621drivers-$(CONFIG_KERNEL_HEADER_TEST) += include/
622net-y := net
623libs-y := lib
624core-y := usr
625virt-y := virt
626endif # KBUILD_EXTMOD
627
628# The all: target is the default when no target is given on the
629# command line.
630# This allow a user to issue only 'make' to build a kernel including modules
631# Defaults to vmlinux, but the arch makefile usually adds further targets
632all: vmlinux
633
634CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
635 $(call cc-option,-fno-tree-loop-im) \
636 $(call cc-disable-warning,maybe-uninitialized,)
637export CFLAGS_GCOV
638
639# The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
640ifdef CONFIG_FUNCTION_TRACER
641 CC_FLAGS_FTRACE := -pg
642endif
643
644RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
645RETPOLINE_VDSO_CFLAGS_GCC := -mindirect-branch=thunk-inline -mindirect-branch-register
646RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
647RETPOLINE_VDSO_CFLAGS_CLANG := -mretpoline
648RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
649RETPOLINE_VDSO_CFLAGS := $(call cc-option,$(RETPOLINE_VDSO_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_VDSO_CFLAGS_CLANG)))
650export RETPOLINE_CFLAGS
651export RETPOLINE_VDSO_CFLAGS
652
653include arch/$(SRCARCH)/Makefile
654
655ifdef need-config
656ifdef may-sync-config
657# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
658# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
659# because some architectures define CROSS_COMPILE there.
660include include/config/auto.conf.cmd
661
662$(KCONFIG_CONFIG):
663 @echo >&2 '***'
664 @echo >&2 '*** Configuration file "$@" not found!'
665 @echo >&2 '***'
666 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
667 @echo >&2 '*** "make menuconfig" or "make xconfig").'
668 @echo >&2 '***'
669 @/bin/false
670
671# The actual configuration files used during the build are stored in
672# include/generated/ and include/config/. Update them if .config is newer than
673# include/config/auto.conf (which mirrors .config).
674#
675# This exploits the 'multi-target pattern rule' trick.
676# The syncconfig should be executed only once to make all the targets.
677%/auto.conf %/auto.conf.cmd %/tristate.conf: $(KCONFIG_CONFIG)
678 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
679else # !may-sync-config
680# External modules and some install targets need include/generated/autoconf.h
681# and include/config/auto.conf but do not care if they are up-to-date.
682# Use auto.conf to trigger the test
683PHONY += include/config/auto.conf
684
685include/config/auto.conf:
686 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
687 echo >&2; \
688 echo >&2 " ERROR: Kernel configuration is invalid."; \
689 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
690 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
691 echo >&2 ; \
692 /bin/false)
693
694endif # may-sync-config
695endif # need-config
696
697KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
698KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
699KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
700KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
701KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
702
703ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
704KBUILD_CFLAGS += -O2
705else ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
706KBUILD_CFLAGS += -O3
707else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
708KBUILD_CFLAGS += -Os
709endif
710
711ifdef CONFIG_CC_DISABLE_WARN_MAYBE_UNINITIALIZED
712KBUILD_CFLAGS += -Wno-maybe-uninitialized
713endif
714
715# Tell gcc to never replace conditional load with a non-conditional one
716KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
717
718include scripts/Makefile.kcov
719include scripts/Makefile.gcc-plugins
720
721ifdef CONFIG_READABLE_ASM
722# Disable optimizations that make assembler listings hard to read.
723# reorder blocks reorders the control in the function
724# ipa clone creates specialized cloned functions
725# partial inlining inlines only parts of functions
726KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
727 $(call cc-option,-fno-ipa-cp-clone,) \
728 $(call cc-option,-fno-partial-inlining)
729endif
730
731ifneq ($(CONFIG_FRAME_WARN),0)
732KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
733endif
734
735stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
736stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
737stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
738
739KBUILD_CFLAGS += $(stackp-flags-y)
740
741ifdef CONFIG_CC_IS_CLANG
742KBUILD_CPPFLAGS += -Qunused-arguments
743KBUILD_CFLAGS += -Wno-format-invalid-specifier
744KBUILD_CFLAGS += -Wno-gnu
745# Quiet clang warning: comparison of unsigned expression < 0 is always false
746KBUILD_CFLAGS += -Wno-tautological-compare
747# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
748# source of a reference will be _MergedGlobals and not on of the whitelisted names.
749# See modpost pattern 2
750KBUILD_CFLAGS += -mno-global-merge
751else
752
753# These warnings generated too much noise in a regular build.
754# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
755KBUILD_CFLAGS += -Wno-unused-but-set-variable
756
757# Warn about unmarked fall-throughs in switch statement.
758# Disabled for clang while comment to attribute conversion happens and
759# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
760KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
761endif
762
763KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
764ifdef CONFIG_FRAME_POINTER
765KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
766else
767# Some targets (ARM with Thumb2, for example), can't be built with frame
768# pointers. For those, we don't have FUNCTION_TRACER automatically
769# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
770# incompatible with -fomit-frame-pointer with current GCC, so we don't use
771# -fomit-frame-pointer with FUNCTION_TRACER.
772ifndef CONFIG_FUNCTION_TRACER
773KBUILD_CFLAGS += -fomit-frame-pointer
774endif
775endif
776
777# Initialize all stack variables with a pattern, if desired.
778ifdef CONFIG_INIT_STACK_ALL
779KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
780endif
781
782DEBUG_CFLAGS := $(call cc-option, -fno-var-tracking-assignments)
783
784ifdef CONFIG_DEBUG_INFO
785ifdef CONFIG_DEBUG_INFO_SPLIT
786DEBUG_CFLAGS += -gsplit-dwarf
787else
788DEBUG_CFLAGS += -g
789endif
790KBUILD_AFLAGS += -Wa,-gdwarf-2
791endif
792ifdef CONFIG_DEBUG_INFO_DWARF4
793DEBUG_CFLAGS += -gdwarf-4
794endif
795
796ifdef CONFIG_DEBUG_INFO_REDUCED
797DEBUG_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
798 $(call cc-option,-fno-var-tracking)
799endif
800
801KBUILD_CFLAGS += $(DEBUG_CFLAGS)
802export DEBUG_CFLAGS
803
804ifdef CONFIG_FUNCTION_TRACER
805ifdef CONFIG_FTRACE_MCOUNT_RECORD
806 # gcc 5 supports generating the mcount tables directly
807 ifeq ($(call cc-option-yn,-mrecord-mcount),y)
808 CC_FLAGS_FTRACE += -mrecord-mcount
809 export CC_USING_RECORD_MCOUNT := 1
810 endif
811 ifdef CONFIG_HAVE_NOP_MCOUNT
812 ifeq ($(call cc-option-yn, -mnop-mcount),y)
813 CC_FLAGS_FTRACE += -mnop-mcount
814 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
815 endif
816 endif
817endif
818ifdef CONFIG_HAVE_FENTRY
819 ifeq ($(call cc-option-yn, -mfentry),y)
820 CC_FLAGS_FTRACE += -mfentry
821 CC_FLAGS_USING += -DCC_USING_FENTRY
822 endif
823endif
824export CC_FLAGS_FTRACE
825KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
826KBUILD_AFLAGS += $(CC_FLAGS_USING)
827ifdef CONFIG_DYNAMIC_FTRACE
828 ifdef CONFIG_HAVE_C_RECORDMCOUNT
829 BUILD_C_RECORDMCOUNT := y
830 export BUILD_C_RECORDMCOUNT
831 endif
832endif
833endif
834
835# We trigger additional mismatches with less inlining
836ifdef CONFIG_DEBUG_SECTION_MISMATCH
837KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
838endif
839
840ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
841KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
842LDFLAGS_vmlinux += --gc-sections
843endif
844
845ifdef CONFIG_LIVEPATCH
846KBUILD_CFLAGS += $(call cc-option, -flive-patching=inline-clone)
847endif
848
849# arch Makefile may override CC so keep this after arch Makefile is included
850NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
851
852# warn about C99 declaration after statement
853KBUILD_CFLAGS += -Wdeclaration-after-statement
854
855# Variable Length Arrays (VLAs) should not be used anywhere in the kernel
856KBUILD_CFLAGS += -Wvla
857
858# disable pointer signed / unsigned warnings in gcc 4.0
859KBUILD_CFLAGS += -Wno-pointer-sign
860
861# disable stringop warnings in gcc 8+
862KBUILD_CFLAGS += $(call cc-disable-warning, stringop-truncation)
863
864# disable invalid "can't wrap" optimizations for signed / pointers
865KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
866
867# clang sets -fmerge-all-constants by default as optimization, but this
868# is non-conforming behavior for C and in fact breaks the kernel, so we
869# need to disable it here generally.
870KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
871
872# for gcc -fno-merge-all-constants disables everything, but it is fine
873# to have actual conforming behavior enabled.
874KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
875
876# Make sure -fstack-check isn't enabled (like gentoo apparently did)
877KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
878
879# conserve stack if available
880KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
881
882# Prohibit date/time macros, which would make the build non-deterministic
883KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
884
885# enforce correct pointer usage
886KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
887
888# Require designated initializers for all marked structures
889KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
890
891# change __FILE__ to the relative path from the srctree
892KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
893
894# ensure -fcf-protection is disabled when using retpoline as it is
895# incompatible with -mindirect-branch=thunk-extern
896ifdef CONFIG_RETPOLINE
897KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
898endif
899
900include scripts/Makefile.kasan
901include scripts/Makefile.extrawarn
902include scripts/Makefile.ubsan
903
904# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
905KBUILD_CPPFLAGS += $(KCPPFLAGS)
906KBUILD_AFLAGS += $(KAFLAGS)
907KBUILD_CFLAGS += $(KCFLAGS)
908
909KBUILD_LDFLAGS_MODULE += --build-id
910LDFLAGS_vmlinux += --build-id
911
912ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
913LDFLAGS_vmlinux += $(call ld-option, -X,)
914endif
915
916ifeq ($(CONFIG_RELR),y)
917LDFLAGS_vmlinux += --pack-dyn-relocs=relr
918endif
919
920# make the checker run with the right architecture
921CHECKFLAGS += --arch=$(ARCH)
922
923# insure the checker run with the right endianness
924CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
925
926# the checker needs the correct machine size
927CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
928
929# Default kernel image to build when no specific target is given.
930# KBUILD_IMAGE may be overruled on the command line or
931# set in the environment
932# Also any assignments in arch/$(ARCH)/Makefile take precedence over
933# this default value
934export KBUILD_IMAGE ?= vmlinux
935
936#
937# INSTALL_PATH specifies where to place the updated kernel and system map
938# images. Default is /boot, but you can set it to other values
939export INSTALL_PATH ?= /boot
940
941#
942# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
943# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
944# an argument if needed. Otherwise it defaults to the kernel install path
945#
946export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
947
948#
949# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
950# relocations required by build roots. This is not defined in the
951# makefile but the argument can be passed to make if needed.
952#
953
954MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
955export MODLIB
956
957#
958# INSTALL_MOD_STRIP, if defined, will cause modules to be
959# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
960# the default option --strip-debug will be used. Otherwise,
961# INSTALL_MOD_STRIP value will be used as the options to the strip command.
962
963ifdef INSTALL_MOD_STRIP
964ifeq ($(INSTALL_MOD_STRIP),1)
965mod_strip_cmd = $(STRIP) --strip-debug
966else
967mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
968endif # INSTALL_MOD_STRIP=1
969else
970mod_strip_cmd = true
971endif # INSTALL_MOD_STRIP
972export mod_strip_cmd
973
974# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
975# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
976# or CONFIG_MODULE_COMPRESS_XZ.
977
978mod_compress_cmd = true
979ifdef CONFIG_MODULE_COMPRESS
980 ifdef CONFIG_MODULE_COMPRESS_GZIP
981 mod_compress_cmd = gzip -n -f
982 endif # CONFIG_MODULE_COMPRESS_GZIP
983 ifdef CONFIG_MODULE_COMPRESS_XZ
984 mod_compress_cmd = xz -f
985 endif # CONFIG_MODULE_COMPRESS_XZ
986endif # CONFIG_MODULE_COMPRESS
987export mod_compress_cmd
988
989ifdef CONFIG_MODULE_SIG_ALL
990$(eval $(call config_filename,MODULE_SIG_KEY))
991
992mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
993else
994mod_sign_cmd = true
995endif
996export mod_sign_cmd
997
998HOST_LIBELF_LIBS = $(shell pkg-config libelf --libs 2>/dev/null || echo -lelf)
999
1000ifdef CONFIG_STACK_VALIDATION
1001 has_libelf := $(call try-run,\
1002 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null $(HOST_LIBELF_LIBS) -,1,0)
1003 ifeq ($(has_libelf),1)
1004 objtool_target := tools/objtool FORCE
1005 else
1006 SKIP_STACK_VALIDATION := 1
1007 export SKIP_STACK_VALIDATION
1008 endif
1009endif
1010
1011PHONY += prepare0
1012
1013export MODORDER := $(extmod-prefix)modules.order
1014
1015ifeq ($(KBUILD_EXTMOD),)
1016core-y += kernel certs mm fs ipc security crypto block
1017
1018vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
1019 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
1020 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
1021
1022vmlinux-alldirs := $(sort $(vmlinux-dirs) Documentation \
1023 $(patsubst %/,%,$(filter %/, $(init-) $(core-) \
1024 $(drivers-) $(net-) $(libs-) $(virt-))))
1025
1026build-dirs := $(vmlinux-dirs)
1027clean-dirs := $(vmlinux-alldirs)
1028
1029init-y := $(patsubst %/, %/built-in.a, $(init-y))
1030core-y := $(patsubst %/, %/built-in.a, $(core-y))
1031drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
1032net-y := $(patsubst %/, %/built-in.a, $(net-y))
1033libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
1034libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
1035virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
1036
1037# Externally visible symbols (used by link-vmlinux.sh)
1038export KBUILD_VMLINUX_OBJS := $(head-y) $(init-y) $(core-y) $(libs-y2) \
1039 $(drivers-y) $(net-y) $(virt-y)
1040export KBUILD_VMLINUX_LIBS := $(libs-y1)
1041export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1042export LDFLAGS_vmlinux
1043# used by scripts/Makefile.package
1044export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) LICENSES arch include scripts tools)
1045
1046vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)
1047
1048# Recurse until adjust_autoksyms.sh is satisfied
1049PHONY += autoksyms_recursive
1050ifdef CONFIG_TRIM_UNUSED_KSYMS
1051autoksyms_recursive: descend modules.order
1052 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
1053 "$(MAKE) -f $(srctree)/Makefile vmlinux"
1054endif
1055
1056# For the kernel to actually contain only the needed exported symbols,
1057# we have to build modules as well to determine what those symbols are.
1058# (this can be evaluated only once include/config/auto.conf has been included)
1059ifdef CONFIG_TRIM_UNUSED_KSYMS
1060 KBUILD_MODULES := 1
1061endif
1062
1063autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
1064
1065$(autoksyms_h):
1066 $(Q)mkdir -p $(dir $@)
1067 $(Q)touch $@
1068
1069ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1070
1071# Final link of vmlinux with optional arch pass after final link
1072cmd_link-vmlinux = \
1073 $(CONFIG_SHELL) $< $(LD) $(KBUILD_LDFLAGS) $(LDFLAGS_vmlinux) ; \
1074 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1075
1076vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1077 +$(call if_changed,link-vmlinux)
1078
1079targets := vmlinux
1080
1081# The actual objects are generated when descending,
1082# make sure no implicit rule kicks in
1083$(sort $(vmlinux-deps)): descend ;
1084
1085filechk_kernel.release = \
1086 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1087
1088# Store (new) KERNELRELEASE string in include/config/kernel.release
1089include/config/kernel.release: FORCE
1090 $(call filechk,kernel.release)
1091
1092# Additional helpers built in scripts
1093# Carefully list dependencies so we do not try to build scripts twice
1094# in parallel
1095PHONY += scripts
1096scripts: scripts_basic scripts_dtc
1097 $(Q)$(MAKE) $(build)=$(@)
1098
1099# Things we need to do before we recursively start building the kernel
1100# or the modules are listed in "prepare".
1101# A multi level approach is used. prepareN is processed before prepareN-1.
1102# archprepare is used in arch Makefiles and when processed asm symlink,
1103# version.h and scripts_basic is processed / created.
1104
1105PHONY += prepare archprepare
1106
1107archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1108 asm-generic $(version_h) $(autoksyms_h) include/generated/utsrelease.h
1109
1110prepare0: archprepare
1111 $(Q)$(MAKE) $(build)=scripts/mod
1112 $(Q)$(MAKE) $(build)=.
1113
1114# All the preparing..
1115prepare: prepare0 prepare-objtool
1116
1117# Support for using generic headers in asm-generic
1118asm-generic := -f $(srctree)/scripts/Makefile.asm-generic obj
1119
1120PHONY += asm-generic uapi-asm-generic
1121asm-generic: uapi-asm-generic
1122 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1123 generic=include/asm-generic
1124uapi-asm-generic:
1125 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1126 generic=include/uapi/asm-generic
1127
1128PHONY += prepare-objtool
1129prepare-objtool: $(objtool_target)
1130ifeq ($(SKIP_STACK_VALIDATION),1)
1131ifdef CONFIG_UNWINDER_ORC
1132 @echo "error: Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1133 @false
1134else
1135 @echo "warning: Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel" >&2
1136endif
1137endif
1138
1139# Generate some files
1140# ---------------------------------------------------------------------------
1141
1142# KERNELRELEASE can change from a few different places, meaning version.h
1143# needs to be updated, so this check is forced on all builds
1144
1145uts_len := 64
1146define filechk_utsrelease.h
1147 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1148 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1149 exit 1; \
1150 fi; \
1151 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1152endef
1153
1154define filechk_version.h
1155 echo \#define LINUX_VERSION_CODE $(shell \
1156 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1157 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'
1158endef
1159
1160$(version_h): FORCE
1161 $(call filechk,version.h)
1162 $(Q)rm -f $(old_version_h)
1163
1164include/generated/utsrelease.h: include/config/kernel.release FORCE
1165 $(call filechk,utsrelease.h)
1166
1167PHONY += headerdep
1168headerdep:
1169 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1170 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1171
1172# ---------------------------------------------------------------------------
1173# Kernel headers
1174
1175#Default location for installed headers
1176export INSTALL_HDR_PATH = $(objtree)/usr
1177
1178quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1179 cmd_headers_install = \
1180 mkdir -p $(INSTALL_HDR_PATH); \
1181 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1182 usr/include $(INSTALL_HDR_PATH)
1183
1184PHONY += headers_install
1185headers_install: headers
1186 $(call cmd,headers_install)
1187
1188PHONY += archheaders archscripts
1189
1190hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1191
1192PHONY += headers
1193headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1194 $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1195 $(error Headers not exportable for the $(SRCARCH) architecture))
1196 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1197 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1198
1199PHONY += headers_check
1200headers_check: headers
1201 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1202 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi HDRCHECK=1
1203
1204ifdef CONFIG_HEADERS_INSTALL
1205prepare: headers
1206endif
1207
1208ifdef CONFIG_HEADERS_CHECK
1209all: headers_check
1210endif
1211
1212PHONY += scripts_unifdef
1213scripts_unifdef: scripts_basic
1214 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1215
1216# ---------------------------------------------------------------------------
1217# Kernel selftest
1218
1219PHONY += kselftest
1220kselftest:
1221 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1222
1223kselftest-%: FORCE
1224 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1225
1226PHONY += kselftest-merge
1227kselftest-merge:
1228 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1229 $(Q)find $(srctree)/tools/testing/selftests -name config | \
1230 xargs $(srctree)/scripts/kconfig/merge_config.sh -m $(objtree)/.config
1231 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1232
1233# ---------------------------------------------------------------------------
1234# Devicetree files
1235
1236ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1237dtstree := arch/$(SRCARCH)/boot/dts
1238endif
1239
1240ifneq ($(dtstree),)
1241
1242%.dtb: include/config/kernel.release scripts_dtc
1243 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1244
1245PHONY += dtbs dtbs_install dt_binding_check
1246dtbs dtbs_check: include/config/kernel.release scripts_dtc
1247 $(Q)$(MAKE) $(build)=$(dtstree)
1248
1249dtbs_check: export CHECK_DTBS=1
1250dtbs_check: dt_binding_check
1251
1252dtbs_install:
1253 $(Q)$(MAKE) $(dtbinst)=$(dtstree)
1254
1255ifdef CONFIG_OF_EARLY_FLATTREE
1256all: dtbs
1257endif
1258
1259endif
1260
1261PHONY += scripts_dtc
1262scripts_dtc: scripts_basic
1263 $(Q)$(MAKE) $(build)=scripts/dtc
1264
1265dt_binding_check: scripts_dtc
1266 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1267
1268# ---------------------------------------------------------------------------
1269# Modules
1270
1271ifdef CONFIG_MODULES
1272
1273# By default, build modules as well
1274
1275all: modules
1276
1277# Build modules
1278#
1279# A module can be listed more than once in obj-m resulting in
1280# duplicate lines in modules.order files. Those are removed
1281# using awk while concatenating to the final file.
1282
1283PHONY += modules
1284modules: $(if $(KBUILD_BUILTIN),vmlinux) modules.order modules.builtin
1285 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1286 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh
1287
1288modules.order: descend
1289 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1290
1291modbuiltin-dirs := $(addprefix _modbuiltin_, $(build-dirs))
1292
1293modules.builtin: $(modbuiltin-dirs)
1294 $(Q)$(AWK) '!x[$$0]++' $(addsuffix /$@, $(build-dirs)) > $@
1295
1296PHONY += $(modbuiltin-dirs)
1297# tristate.conf is not included from this Makefile. Add it as a prerequisite
1298# here to make it self-healing in case somebody accidentally removes it.
1299$(modbuiltin-dirs): include/config/tristate.conf
1300 $(Q)$(MAKE) $(modbuiltin)=$(patsubst _modbuiltin_%,%,$@)
1301
1302# Target to prepare building external modules
1303PHONY += modules_prepare
1304modules_prepare: prepare
1305
1306# Target to install modules
1307PHONY += modules_install
1308modules_install: _modinst_ _modinst_post
1309
1310PHONY += _modinst_
1311_modinst_:
1312 @rm -rf $(MODLIB)/kernel
1313 @rm -f $(MODLIB)/source
1314 @mkdir -p $(MODLIB)/kernel
1315 @ln -s $(abspath $(srctree)) $(MODLIB)/source
1316 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1317 rm -f $(MODLIB)/build ; \
1318 ln -s $(CURDIR) $(MODLIB)/build ; \
1319 fi
1320 @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
1321 @sed 's:^:kernel/:' modules.builtin > $(MODLIB)/modules.builtin
1322 @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
1323 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1324
1325# This depmod is only for convenience to give the initial
1326# boot a modules.dep even before / is mounted read-write. However the
1327# boot script depmod is the master version.
1328PHONY += _modinst_post
1329_modinst_post: _modinst_
1330 $(call cmd,depmod)
1331
1332ifeq ($(CONFIG_MODULE_SIG), y)
1333PHONY += modules_sign
1334modules_sign:
1335 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1336endif
1337
1338else # CONFIG_MODULES
1339
1340# Modules not configured
1341# ---------------------------------------------------------------------------
1342
1343PHONY += modules modules_install
1344modules modules_install:
1345 @echo >&2
1346 @echo >&2 "The present kernel configuration has modules disabled."
1347 @echo >&2 "Type 'make config' and enable loadable module support."
1348 @echo >&2 "Then build a kernel with module support enabled."
1349 @echo >&2
1350 @exit 1
1351
1352endif # CONFIG_MODULES
1353
1354###
1355# Cleaning is done on three levels.
1356# make clean Delete most generated files
1357# Leave enough to build external modules
1358# make mrproper Delete the current configuration, and all generated files
1359# make distclean Remove editor backup files, patch leftover files and the like
1360
1361# Directories & files removed with 'make clean'
1362CLEAN_DIRS += include/ksym
1363CLEAN_FILES += modules.builtin.modinfo
1364
1365# Directories & files removed with 'make mrproper'
1366MRPROPER_DIRS += include/config include/generated \
1367 arch/$(SRCARCH)/include/generated .tmp_objdiff \
1368 debian/ snap/ tar-install/
1369MRPROPER_FILES += .config .config.old .version \
1370 Module.symvers \
1371 signing_key.pem signing_key.priv signing_key.x509 \
1372 x509.genkey extra_certificates signing_key.x509.keyid \
1373 signing_key.x509.signer vmlinux-gdb.py \
1374 *.spec
1375
1376# Directories & files removed with 'make distclean'
1377DISTCLEAN_DIRS +=
1378DISTCLEAN_FILES += tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS
1379
1380# clean - Delete most, but leave enough to build external modules
1381#
1382clean: rm-dirs := $(CLEAN_DIRS)
1383clean: rm-files := $(CLEAN_FILES)
1384
1385PHONY += archclean vmlinuxclean
1386
1387vmlinuxclean:
1388 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1389 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1390
1391clean: archclean vmlinuxclean
1392
1393# mrproper - Delete all generated files, including .config
1394#
1395mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1396mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1397mrproper-dirs := $(addprefix _mrproper_,scripts)
1398
1399PHONY += $(mrproper-dirs) mrproper
1400$(mrproper-dirs):
1401 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1402
1403mrproper: clean $(mrproper-dirs)
1404 $(call cmd,rmdirs)
1405 $(call cmd,rmfiles)
1406
1407# distclean
1408#
1409distclean: rm-dirs := $(wildcard $(DISTCLEAN_DIRS))
1410distclean: rm-files := $(wildcard $(DISTCLEAN_FILES))
1411
1412PHONY += distclean
1413
1414distclean: mrproper
1415 $(call cmd,rmdirs)
1416 $(call cmd,rmfiles)
1417 @find $(srctree) $(RCS_FIND_IGNORE) \
1418 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1419 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1420 -o -name 'core' \) \
1421 -type f -print | xargs rm -f
1422
1423
1424# Packaging of the kernel to various formats
1425# ---------------------------------------------------------------------------
1426
1427%src-pkg: FORCE
1428 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1429%pkg: include/config/kernel.release FORCE
1430 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1431
1432# Brief documentation of the typical targets used
1433# ---------------------------------------------------------------------------
1434
1435boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1436boards := $(sort $(notdir $(boards)))
1437board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1438board-dirs := $(sort $(notdir $(board-dirs:/=)))
1439
1440PHONY += help
1441help:
1442 @echo 'Cleaning targets:'
1443 @echo ' clean - Remove most generated files but keep the config and'
1444 @echo ' enough build support to build external modules'
1445 @echo ' mrproper - Remove all generated files + config + various backup files'
1446 @echo ' distclean - mrproper + remove editor backup and patch files'
1447 @echo ''
1448 @echo 'Configuration targets:'
1449 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1450 @echo ''
1451 @echo 'Other generic targets:'
1452 @echo ' all - Build all targets marked with [*]'
1453 @echo '* vmlinux - Build the bare kernel'
1454 @echo '* modules - Build all modules'
1455 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1456 @echo ' dir/ - Build all files in dir and below'
1457 @echo ' dir/file.[ois] - Build specified target only'
1458 @echo ' dir/file.ll - Build the LLVM assembly file'
1459 @echo ' (requires compiler support for LLVM assembly generation)'
1460 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1461 @echo ' (requires a recent binutils and recent build (System.map))'
1462 @echo ' dir/file.ko - Build module including final link'
1463 @echo ' modules_prepare - Set up for building external modules'
1464 @echo ' tags/TAGS - Generate tags file for editors'
1465 @echo ' cscope - Generate cscope index'
1466 @echo ' gtags - Generate GNU GLOBAL index'
1467 @echo ' kernelrelease - Output the release version string (use with make -s)'
1468 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1469 @echo ' image_name - Output the image name (use with make -s)'
1470 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1471 echo ' (default: $(INSTALL_HDR_PATH))'; \
1472 echo ''
1473 @echo 'Static analysers:'
1474 @echo ' checkstack - Generate a list of stack hogs'
1475 @echo ' namespacecheck - Name space analysis on compiled kernel'
1476 @echo ' versioncheck - Sanity check on version.h usage'
1477 @echo ' includecheck - Check for duplicate included header files'
1478 @echo ' export_report - List the usages of all exported symbols'
1479 @echo ' headers_check - Sanity check on exported headers'
1480 @echo ' headerdep - Detect inclusion cycles in headers'
1481 @echo ' coccicheck - Check with Coccinelle'
1482 @echo ''
1483 @echo 'Tools:'
1484 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1485 @echo ''
1486 @echo 'Kernel selftest:'
1487 @echo ' kselftest - Build and run kernel selftest (run as root)'
1488 @echo ' Build, install, and boot kernel before'
1489 @echo ' running kselftest on it'
1490 @echo ' kselftest-clean - Remove all generated kselftest files'
1491 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
1492 @echo ' .config.'
1493 @echo ''
1494 @$(if $(dtstree), \
1495 echo 'Devicetree:'; \
1496 echo '* dtbs - Build device tree blobs for enabled boards'; \
1497 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1498 echo ' dt_binding_check - Validate device tree binding documents'; \
1499 echo ' dtbs_check - Validate device tree source files';\
1500 echo '')
1501
1502 @echo 'Userspace tools targets:'
1503 @echo ' use "make tools/help"'
1504 @echo ' or "cd tools; make help"'
1505 @echo ''
1506 @echo 'Kernel packaging:'
1507 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1508 @echo ''
1509 @echo 'Documentation targets:'
1510 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1511 @echo ''
1512 @echo 'Architecture specific targets ($(SRCARCH)):'
1513 @$(if $(archhelp),$(archhelp),\
1514 echo ' No architecture specific help defined for $(SRCARCH)')
1515 @echo ''
1516 @$(if $(boards), \
1517 $(foreach b, $(boards), \
1518 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1519 echo '')
1520 @$(if $(board-dirs), \
1521 $(foreach b, $(board-dirs), \
1522 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1523 printf " %-16s - Show all of the above\\n" help-boards; \
1524 echo '')
1525
1526 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1527 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1528 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1529 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1530 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1531 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1532 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3 where'
1533 @echo ' 1: warnings which may be relevant and do not occur too often'
1534 @echo ' 2: warnings which occur quite often but may still be relevant'
1535 @echo ' 3: more obscure warnings, can most likely be ignored'
1536 @echo ' Multiple levels can be combined with W=12 or W=123'
1537 @echo ''
1538 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1539 @echo 'For further info see the ./README file'
1540
1541
1542help-board-dirs := $(addprefix help-,$(board-dirs))
1543
1544help-boards: $(help-board-dirs)
1545
1546boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1547
1548$(help-board-dirs): help-%:
1549 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1550 @$(if $(boards-per-dir), \
1551 $(foreach b, $(boards-per-dir), \
1552 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1553 echo '')
1554
1555
1556# Documentation targets
1557# ---------------------------------------------------------------------------
1558DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1559 linkcheckdocs dochelp refcheckdocs
1560PHONY += $(DOC_TARGETS)
1561$(DOC_TARGETS):
1562 $(Q)$(MAKE) $(build)=Documentation $@
1563
1564# Misc
1565# ---------------------------------------------------------------------------
1566
1567PHONY += scripts_gdb
1568scripts_gdb: prepare0
1569 $(Q)$(MAKE) $(build)=scripts/gdb
1570 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1571
1572ifdef CONFIG_GDB_SCRIPTS
1573all: scripts_gdb
1574endif
1575
1576else # KBUILD_EXTMOD
1577
1578###
1579# External module support.
1580# When building external modules the kernel used as basis is considered
1581# read-only, and no consistency checks are made and the make
1582# system is not used on the basis kernel. If updates are required
1583# in the basis kernel ordinary make commands (without M=...) must
1584# be used.
1585#
1586# The following are the only valid targets when building external
1587# modules.
1588# make M=dir clean Delete all automatically generated files
1589# make M=dir modules Make all modules in specified dir
1590# make M=dir Same as 'make M=dir modules'
1591# make M=dir modules_install
1592# Install the modules built in the module directory
1593# Assumes install directory is already created
1594
1595# We are always building modules
1596KBUILD_MODULES := 1
1597
1598PHONY += $(objtree)/Module.symvers
1599$(objtree)/Module.symvers:
1600 @test -e $(objtree)/Module.symvers || ( \
1601 echo; \
1602 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1603 echo " is missing; modules will have no dependencies and modversions."; \
1604 echo )
1605
1606build-dirs := $(KBUILD_EXTMOD)
1607PHONY += modules
1608modules: descend $(objtree)/Module.symvers
1609 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1610
1611PHONY += modules_install
1612modules_install: _emodinst_ _emodinst_post
1613
1614install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1615PHONY += _emodinst_
1616_emodinst_:
1617 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1618 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1619
1620PHONY += _emodinst_post
1621_emodinst_post: _emodinst_
1622 $(call cmd,depmod)
1623
1624clean-dirs := $(KBUILD_EXTMOD)
1625clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1626
1627PHONY += /
1628/:
1629 @echo >&2 '"$(MAKE) /" is no longer supported. Please use "$(MAKE) ./" instead.'
1630
1631PHONY += help
1632help:
1633 @echo ' Building external modules.'
1634 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1635 @echo ''
1636 @echo ' modules - default target, build the module(s)'
1637 @echo ' modules_install - install the module'
1638 @echo ' clean - remove generated files in module directory only'
1639 @echo ''
1640
1641PHONY += prepare
1642endif # KBUILD_EXTMOD
1643
1644# Handle descending into subdirectories listed in $(build-dirs)
1645# Preset locale variables to speed up the build process. Limit locale
1646# tweaks to this spot to avoid wrong language settings when running
1647# make menuconfig etc.
1648# Error messages still appears in the original language
1649PHONY += descend $(build-dirs)
1650descend: $(build-dirs)
1651$(build-dirs): prepare
1652 $(Q)$(MAKE) $(build)=$@ single-build=$(single-build) need-builtin=1 need-modorder=1
1653
1654clean-dirs := $(addprefix _clean_, $(clean-dirs))
1655PHONY += $(clean-dirs) clean
1656$(clean-dirs):
1657 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1658
1659clean: $(clean-dirs)
1660 $(call cmd,rmdirs)
1661 $(call cmd,rmfiles)
1662 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1663 \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1664 -o -name '*.ko.*' \
1665 -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
1666 -o -name '*.dwo' -o -name '*.lst' \
1667 -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
1668 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1669 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1670 -o -name '*.asn1.[ch]' \
1671 -o -name '*.symtypes' -o -name 'modules.order' \
1672 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1673 -o -name '*.c.[012]*.*' \
1674 -o -name '*.ll' \
1675 -o -name '*.gcno' \) -type f -print | xargs rm -f
1676
1677# Generate tags for editors
1678# ---------------------------------------------------------------------------
1679quiet_cmd_tags = GEN $@
1680 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1681
1682tags TAGS cscope gtags: FORCE
1683 $(call cmd,tags)
1684
1685# Script to generate missing namespace dependencies
1686# ---------------------------------------------------------------------------
1687
1688PHONY += nsdeps
1689
1690nsdeps: modules
1691 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
1692 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1693
1694# Scripts to check various things for consistency
1695# ---------------------------------------------------------------------------
1696
1697PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1698
1699includecheck:
1700 find $(srctree)/* $(RCS_FIND_IGNORE) \
1701 -name '*.[hcS]' -type f -print | sort \
1702 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1703
1704versioncheck:
1705 find $(srctree)/* $(RCS_FIND_IGNORE) \
1706 -name '*.[hcS]' -type f -print | sort \
1707 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1708
1709coccicheck:
1710 $(Q)$(BASH) $(srctree)/scripts/$@
1711
1712namespacecheck:
1713 $(PERL) $(srctree)/scripts/namespace.pl
1714
1715export_report:
1716 $(PERL) $(srctree)/scripts/export_report.pl
1717
1718PHONY += checkstack kernelrelease kernelversion image_name
1719
1720# UML needs a little special treatment here. It wants to use the host
1721# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1722# else wants $(ARCH), including people doing cross-builds, which means
1723# that $(SUBARCH) doesn't work here.
1724ifeq ($(ARCH), um)
1725CHECKSTACK_ARCH := $(SUBARCH)
1726else
1727CHECKSTACK_ARCH := $(ARCH)
1728endif
1729checkstack:
1730 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1731 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1732
1733kernelrelease:
1734 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1735
1736kernelversion:
1737 @echo $(KERNELVERSION)
1738
1739image_name:
1740 @echo $(KBUILD_IMAGE)
1741
1742# Clear a bunch of variables before executing the submake
1743
1744ifeq ($(quiet),silent_)
1745tools_silent=s
1746endif
1747
1748tools/: FORCE
1749 $(Q)mkdir -p $(objtree)/tools
1750 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1751
1752tools/%: FORCE
1753 $(Q)mkdir -p $(objtree)/tools
1754 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1755
1756# Single targets
1757# ---------------------------------------------------------------------------
1758# To build individual files in subdirectories, you can do like this:
1759#
1760# make foo/bar/baz.s
1761#
1762# The supported suffixes for single-target are listed in 'single-targets'
1763#
1764# To build only under specific subdirectories, you can do like this:
1765#
1766# make foo/bar/baz/
1767
1768ifdef single-build
1769
1770single-all := $(filter $(single-targets), $(MAKECMDGOALS))
1771
1772# .ko is special because modpost is needed
1773single-ko := $(sort $(filter %.ko, $(single-all)))
1774single-no-ko := $(sort $(patsubst %.ko,%.mod, $(single-all)))
1775
1776$(single-ko): single_modpost
1777 @:
1778$(single-no-ko): descend
1779 @:
1780
1781ifeq ($(KBUILD_EXTMOD),)
1782# For the single build of in-tree modules, use a temporary file to avoid
1783# the situation of modules_install installing an invalid modules.order.
1784MODORDER := .modules.tmp
1785endif
1786
1787PHONY += single_modpost
1788single_modpost: $(single-no-ko)
1789 $(Q){ $(foreach m, $(single-ko), echo $(extmod-prefix)$m;) } > $(MODORDER)
1790 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1791
1792KBUILD_MODULES := 1
1793
1794export KBUILD_SINGLE_TARGETS := $(addprefix $(extmod-prefix), $(single-no-ko))
1795
1796single-build = $(if $(filter-out $@/, $(single-no-ko)),1)
1797
1798endif
1799
1800# FIXME Should go into a make.lib or something
1801# ===========================================================================
1802
1803quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1804 cmd_rmdirs = rm -rf $(rm-dirs)
1805
1806quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1807 cmd_rmfiles = rm -f $(rm-files)
1808
1809# Run depmod only if we have System.map and depmod is executable
1810quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1811 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1812 $(KERNELRELEASE)
1813
1814# read saved command lines for existing targets
1815existing-targets := $(wildcard $(sort $(targets)))
1816
1817-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
1818
1819endif # config-targets
1820endif # mixed-build
1821endif # need-sub-make
1822
1823PHONY += FORCE
1824FORCE:
1825
1826# Declare the contents of the PHONY variable as phony. We keep that
1827# information in a variable so we can use it in if_changed and friends.
1828.PHONY: $(PHONY)