projects/linux·blob a121103c · refs

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1VERSION = 4
2PATCHLEVEL = 10
3SUBLEVEL = 0
4EXTRAVERSION = -rc3
5NAME = Roaring Lionus
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# o Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18# Avoid funny character set dependencies
19unexport LC_ALL
20LC_COLLATE=C
21LC_NUMERIC=C
22export LC_COLLATE LC_NUMERIC
23
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
27# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
43# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61# $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
69ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71endif
72ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74endif
75
76ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79else
80 quiet=quiet_
81 Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90endif
91else # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122endif
123
124# That's our default target when none is given on the command line
125PHONY := _all
126_all:
127
128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 $(error main directory cannot contain spaces nor colons)
133endif
134
135ifneq ($(KBUILD_OUTPUT),)
136# Invoke a second make in the output directory, passing relevant variables
137# check that the output directory actually exists
138saved-output := $(KBUILD_OUTPUT)
139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
140 && /bin/pwd)
141$(if $(KBUILD_OUTPUT),, \
142 $(error failed to create output directory "$(saved-output)"))
143
144PHONY += $(MAKECMDGOALS) sub-make
145
146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
147 @:
148
149sub-make:
150 $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151 -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
152
153# Leave processing to above invocation of make
154skip-makefile := 1
155endif # ifneq ($(KBUILD_OUTPUT),)
156endif # ifeq ($(KBUILD_SRC),)
157
158# We process the rest of the Makefile if this is the final invocation of make
159ifeq ($(skip-makefile),)
160
161# Do not print "Entering directory ...",
162# but we want to display it when entering to the output directory
163# so that IDEs/editors are able to understand relative filenames.
164MAKEFLAGS += --no-print-directory
165
166# Call a source code checker (by default, "sparse") as part of the
167# C compilation.
168#
169# Use 'make C=1' to enable checking of only re-compiled files.
170# Use 'make C=2' to enable checking of *all* source files, regardless
171# of whether they are re-compiled or not.
172#
173# See the file "Documentation/sparse.txt" for more details, including
174# where to get the "sparse" utility.
175
176ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC = $(C)
178endif
179ifndef KBUILD_CHECKSRC
180 KBUILD_CHECKSRC = 0
181endif
182
183# Use make M=dir to specify directory of external module to build
184# Old syntax make ... SUBDIRS=$PWD is still supported
185# Setting the environment variable KBUILD_EXTMOD take precedence
186ifdef SUBDIRS
187 KBUILD_EXTMOD ?= $(SUBDIRS)
188endif
189
190ifeq ("$(origin M)", "command line")
191 KBUILD_EXTMOD := $(M)
192endif
193
194# If building an external module we do not care about the all: rule
195# but instead _all depend on modules
196PHONY += all
197ifeq ($(KBUILD_EXTMOD),)
198_all: all
199else
200_all: modules
201endif
202
203ifeq ($(KBUILD_SRC),)
204 # building in the source tree
205 srctree := .
206else
207 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208 # building in a subdirectory of the source tree
209 srctree := ..
210 else
211 srctree := $(KBUILD_SRC)
212 endif
213endif
214objtree := .
215src := $(srctree)
216obj := $(objtree)
217
218VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
219
220export srctree objtree VPATH
221
222# SUBARCH tells the usermode build what the underlying arch is. That is set
223# first, and if a usermode build is happening, the "ARCH=um" on the command
224# line overrides the setting of ARCH below. If a native build is happening,
225# then ARCH is assigned, getting whatever value it gets normally, and
226# SUBARCH is subsequently ignored.
227
228SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
229 -e s/sun4u/sparc64/ \
230 -e s/arm.*/arm/ -e s/sa110/arm/ \
231 -e s/s390x/s390/ -e s/parisc64/parisc/ \
232 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
233 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
234
235# Cross compiling and selecting different set of gcc/bin-utils
236# ---------------------------------------------------------------------------
237#
238# When performing cross compilation for other architectures ARCH shall be set
239# to the target architecture. (See arch/* for the possibilities).
240# ARCH can be set during invocation of make:
241# make ARCH=ia64
242# Another way is to have ARCH set in the environment.
243# The default ARCH is the host where make is executed.
244
245# CROSS_COMPILE specify the prefix used for all executables used
246# during compilation. Only gcc and related bin-utils executables
247# are prefixed with $(CROSS_COMPILE).
248# CROSS_COMPILE can be set on the command line
249# make CROSS_COMPILE=ia64-linux-
250# Alternatively CROSS_COMPILE can be set in the environment.
251# A third alternative is to store a setting in .config so that plain
252# "make" in the configured kernel build directory always uses that.
253# Default value for CROSS_COMPILE is not to prefix executables
254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
255ARCH ?= $(SUBARCH)
256CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
257
258# Architecture as present in compile.h
259UTS_MACHINE := $(ARCH)
260SRCARCH := $(ARCH)
261
262# Additional ARCH settings for x86
263ifeq ($(ARCH),i386)
264 SRCARCH := x86
265endif
266ifeq ($(ARCH),x86_64)
267 SRCARCH := x86
268endif
269
270# Additional ARCH settings for sparc
271ifeq ($(ARCH),sparc32)
272 SRCARCH := sparc
273endif
274ifeq ($(ARCH),sparc64)
275 SRCARCH := sparc
276endif
277
278# Additional ARCH settings for sh
279ifeq ($(ARCH),sh64)
280 SRCARCH := sh
281endif
282
283# Additional ARCH settings for tile
284ifeq ($(ARCH),tilepro)
285 SRCARCH := tile
286endif
287ifeq ($(ARCH),tilegx)
288 SRCARCH := tile
289endif
290
291# Where to locate arch specific headers
292hdr-arch := $(SRCARCH)
293
294KCONFIG_CONFIG ?= .config
295export KCONFIG_CONFIG
296
297# SHELL used by kbuild
298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299 else if [ -x /bin/bash ]; then echo /bin/bash; \
300 else echo sh; fi ; fi)
301
302HOSTCC = gcc
303HOSTCXX = g++
304HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
305HOSTCXXFLAGS = -O2
306
307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
309 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
310endif
311
312# Decide whether to build built-in, modular, or both.
313# Normally, just do built-in.
314
315KBUILD_MODULES :=
316KBUILD_BUILTIN := 1
317
318# If we have only "make modules", don't compile built-in objects.
319# When we're building modules with modversions, we need to consider
320# the built-in objects during the descend as well, in order to
321# make sure the checksums are up to date before we record them.
322
323ifeq ($(MAKECMDGOALS),modules)
324 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
325endif
326
327# If we have "make <whatever> modules", compile modules
328# in addition to whatever we do anyway.
329# Just "make" or "make all" shall build modules as well
330
331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332 KBUILD_MODULES := 1
333endif
334
335ifeq ($(MAKECMDGOALS),)
336 KBUILD_MODULES := 1
337endif
338
339export KBUILD_MODULES KBUILD_BUILTIN
340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
341
342# We need some generic definitions (do not try to remake the file).
343scripts/Kbuild.include: ;
344include scripts/Kbuild.include
345
346# Make variables (CC, etc...)
347AS = $(CROSS_COMPILE)as
348LD = $(CROSS_COMPILE)ld
349CC = $(CROSS_COMPILE)gcc
350CPP = $(CC) -E
351AR = $(CROSS_COMPILE)ar
352NM = $(CROSS_COMPILE)nm
353STRIP = $(CROSS_COMPILE)strip
354OBJCOPY = $(CROSS_COMPILE)objcopy
355OBJDUMP = $(CROSS_COMPILE)objdump
356AWK = awk
357GENKSYMS = scripts/genksyms/genksyms
358INSTALLKERNEL := installkernel
359DEPMOD = /sbin/depmod
360PERL = perl
361PYTHON = python
362CHECK = sparse
363
364CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
365 -Wbitwise -Wno-return-void $(CF)
366NOSTDINC_FLAGS =
367CFLAGS_MODULE =
368AFLAGS_MODULE =
369LDFLAGS_MODULE =
370CFLAGS_KERNEL =
371AFLAGS_KERNEL =
372LDFLAGS_vmlinux =
373CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
374CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
375
376
377# Use USERINCLUDE when you must reference the UAPI directories only.
378USERINCLUDE := \
379 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
380 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
381 -I$(srctree)/include/uapi \
382 -I$(objtree)/include/generated/uapi \
383 -include $(srctree)/include/linux/kconfig.h
384
385# Use LINUXINCLUDE when you must reference the include/ directory.
386# Needed to be compatible with the O= option
387LINUXINCLUDE := \
388 -I$(srctree)/arch/$(hdr-arch)/include \
389 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
390 -I$(objtree)/arch/$(hdr-arch)/include/generated \
391 $(if $(KBUILD_SRC), -I$(srctree)/include) \
392 -I$(objtree)/include
393
394LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
395
396KBUILD_CPPFLAGS := -D__KERNEL__
397
398KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
399 -fno-strict-aliasing -fno-common \
400 -Werror-implicit-function-declaration \
401 -Wno-format-security \
402 -std=gnu89 $(call cc-option,-fno-PIE)
403
404
405KBUILD_AFLAGS_KERNEL :=
406KBUILD_CFLAGS_KERNEL :=
407KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
408KBUILD_AFLAGS_MODULE := -DMODULE
409KBUILD_CFLAGS_MODULE := -DMODULE
410KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
411
412# Read KERNELRELEASE from include/config/kernel.release (if it exists)
413KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
414KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
415
416export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
417export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
418export CPP AR NM STRIP OBJCOPY OBJDUMP
419export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
420export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
421
422export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
423export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
424export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
425export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
426export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
427export KBUILD_ARFLAGS
428
429# When compiling out-of-tree modules, put MODVERDIR in the module
430# tree rather than in the kernel tree. The kernel tree might
431# even be read-only.
432export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
433
434# Files to ignore in find ... statements
435
436export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
437 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
438 -prune -o
439export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
440 --exclude CVS --exclude .pc --exclude .hg --exclude .git
441
442# ===========================================================================
443# Rules shared between *config targets and build targets
444
445# Basic helpers built in scripts/
446PHONY += scripts_basic
447scripts_basic:
448 $(Q)$(MAKE) $(build)=scripts/basic
449 $(Q)rm -f .tmp_quiet_recordmcount
450
451# To avoid any implicit rule to kick in, define an empty command.
452scripts/basic/%: scripts_basic ;
453
454PHONY += outputmakefile
455# outputmakefile generates a Makefile in the output directory, if using a
456# separate output directory. This allows convenient use of make in the
457# output directory.
458outputmakefile:
459ifneq ($(KBUILD_SRC),)
460 $(Q)ln -fsn $(srctree) source
461 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
462 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
463endif
464
465# Support for using generic headers in asm-generic
466PHONY += asm-generic
467asm-generic:
468 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
469 src=asm obj=arch/$(SRCARCH)/include/generated/asm
470 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
471 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
472
473# To make sure we do not include .config for any of the *config targets
474# catch them early, and hand them over to scripts/kconfig/Makefile
475# It is allowed to specify more targets when calling make, including
476# mixing *config targets and build targets.
477# For example 'make oldconfig all'.
478# Detect when mixed targets is specified, and make a second invocation
479# of make so .config is not included in this case either (for *config).
480
481version_h := include/generated/uapi/linux/version.h
482old_version_h := include/linux/version.h
483
484no-dot-config-targets := clean mrproper distclean \
485 cscope gtags TAGS tags help% %docs check% coccicheck \
486 $(version_h) headers_% archheaders archscripts \
487 kernelversion %src-pkg
488
489config-targets := 0
490mixed-targets := 0
491dot-config := 1
492
493ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
494 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
495 dot-config := 0
496 endif
497endif
498
499ifeq ($(KBUILD_EXTMOD),)
500 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
501 config-targets := 1
502 ifneq ($(words $(MAKECMDGOALS)),1)
503 mixed-targets := 1
504 endif
505 endif
506endif
507# install and module_install need also be processed one by one
508ifneq ($(filter install,$(MAKECMDGOALS)),)
509 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
510 mixed-targets := 1
511 endif
512endif
513
514ifeq ($(mixed-targets),1)
515# ===========================================================================
516# We're called with mixed targets (*config and build targets).
517# Handle them one by one.
518
519PHONY += $(MAKECMDGOALS) __build_one_by_one
520
521$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
522 @:
523
524__build_one_by_one:
525 $(Q)set -e; \
526 for i in $(MAKECMDGOALS); do \
527 $(MAKE) -f $(srctree)/Makefile $$i; \
528 done
529
530else
531ifeq ($(config-targets),1)
532# ===========================================================================
533# *config targets only - make sure prerequisites are updated, and descend
534# in scripts/kconfig to make the *config target
535
536# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
537# KBUILD_DEFCONFIG may point out an alternative default configuration
538# used for 'make defconfig'
539include arch/$(SRCARCH)/Makefile
540export KBUILD_DEFCONFIG KBUILD_KCONFIG
541
542config: scripts_basic outputmakefile FORCE
543 $(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545%config: scripts_basic outputmakefile FORCE
546 $(Q)$(MAKE) $(build)=scripts/kconfig $@
547
548else
549# ===========================================================================
550# Build targets only - this includes vmlinux, arch specific targets, clean
551# targets and others. In general all targets except *config targets.
552
553ifeq ($(KBUILD_EXTMOD),)
554# Additional helpers built in scripts/
555# Carefully list dependencies so we do not try to build scripts twice
556# in parallel
557PHONY += scripts
558scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
559 asm-generic gcc-plugins
560 $(Q)$(MAKE) $(build)=$(@)
561
562# Objects we will link into vmlinux / subdirs we need to visit
563init-y := init/
564drivers-y := drivers/ sound/ firmware/
565net-y := net/
566libs-y := lib/
567core-y := usr/
568virt-y := virt/
569endif # KBUILD_EXTMOD
570
571ifeq ($(dot-config),1)
572# Read in config
573-include include/config/auto.conf
574
575ifeq ($(KBUILD_EXTMOD),)
576# Read in dependencies to all Kconfig* files, make sure to run
577# oldconfig if changes are detected.
578-include include/config/auto.conf.cmd
579
580# To avoid any implicit rule to kick in, define an empty command
581$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
582
583# If .config is newer than include/config/auto.conf, someone tinkered
584# with it and forgot to run make oldconfig.
585# if auto.conf.cmd is missing then we are probably in a cleaned tree so
586# we execute the config step to be sure to catch updated Kconfig files
587include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
588 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
589else
590# external modules needs include/generated/autoconf.h and include/config/auto.conf
591# but do not care if they are up-to-date. Use auto.conf to trigger the test
592PHONY += include/config/auto.conf
593
594include/config/auto.conf:
595 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
596 echo >&2; \
597 echo >&2 " ERROR: Kernel configuration is invalid."; \
598 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
599 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
600 echo >&2 ; \
601 /bin/false)
602
603endif # KBUILD_EXTMOD
604
605else
606# Dummy target needed, because used as prerequisite
607include/config/auto.conf: ;
608endif # $(dot-config)
609
610# For the kernel to actually contain only the needed exported symbols,
611# we have to build modules as well to determine what those symbols are.
612# (this can be evaluated only once include/config/auto.conf has been included)
613ifdef CONFIG_TRIM_UNUSED_KSYMS
614 KBUILD_MODULES := 1
615endif
616
617# The all: target is the default when no target is given on the
618# command line.
619# This allow a user to issue only 'make' to build a kernel including modules
620# Defaults to vmlinux, but the arch makefile usually adds further targets
621all: vmlinux
622
623# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
624# values of the respective KBUILD_* variables
625ARCH_CPPFLAGS :=
626ARCH_AFLAGS :=
627ARCH_CFLAGS :=
628include arch/$(SRCARCH)/Makefile
629
630KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
631KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
632
633ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
634KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
635KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
636endif
637
638ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
639KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
640else
641ifdef CONFIG_PROFILE_ALL_BRANCHES
642KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
643else
644KBUILD_CFLAGS += -O2
645endif
646endif
647
648KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
649 $(call cc-disable-warning,maybe-uninitialized,))
650
651# Tell gcc to never replace conditional load with a non-conditional one
652KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
653
654include scripts/Makefile.gcc-plugins
655
656ifdef CONFIG_READABLE_ASM
657# Disable optimizations that make assembler listings hard to read.
658# reorder blocks reorders the control in the function
659# ipa clone creates specialized cloned functions
660# partial inlining inlines only parts of functions
661KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
662 $(call cc-option,-fno-ipa-cp-clone,) \
663 $(call cc-option,-fno-partial-inlining)
664endif
665
666ifneq ($(CONFIG_FRAME_WARN),0)
667KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
668endif
669
670# This selects the stack protector compiler flag. Testing it is delayed
671# until after .config has been reprocessed, in the prepare-compiler-check
672# target.
673ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
674 stackp-flag := -fstack-protector
675 stackp-name := REGULAR
676else
677ifdef CONFIG_CC_STACKPROTECTOR_STRONG
678 stackp-flag := -fstack-protector-strong
679 stackp-name := STRONG
680else
681 # Force off for distro compilers that enable stack protector by default.
682 stackp-flag := $(call cc-option, -fno-stack-protector)
683endif
684endif
685# Find arch-specific stack protector compiler sanity-checking script.
686ifdef CONFIG_CC_STACKPROTECTOR
687 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
688 stackp-check := $(wildcard $(stackp-path))
689endif
690KBUILD_CFLAGS += $(stackp-flag)
691
692ifeq ($(cc-name),clang)
693KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
694KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
695KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
696KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
697KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
698# Quiet clang warning: comparison of unsigned expression < 0 is always false
699KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
700# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
701# source of a reference will be _MergedGlobals and not on of the whitelisted names.
702# See modpost pattern 2
703KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
704KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
705else
706
707# These warnings generated too much noise in a regular build.
708# Use make W=1 to enable them (see scripts/Makefile.build)
709KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
710KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
711endif
712
713ifdef CONFIG_FRAME_POINTER
714KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
715else
716# Some targets (ARM with Thumb2, for example), can't be built with frame
717# pointers. For those, we don't have FUNCTION_TRACER automatically
718# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
719# incompatible with -fomit-frame-pointer with current GCC, so we don't use
720# -fomit-frame-pointer with FUNCTION_TRACER.
721ifndef CONFIG_FUNCTION_TRACER
722KBUILD_CFLAGS += -fomit-frame-pointer
723endif
724endif
725
726KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
727
728ifdef CONFIG_DEBUG_INFO
729ifdef CONFIG_DEBUG_INFO_SPLIT
730KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
731else
732KBUILD_CFLAGS += -g
733endif
734KBUILD_AFLAGS += -Wa,-gdwarf-2
735endif
736ifdef CONFIG_DEBUG_INFO_DWARF4
737KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
738endif
739
740ifdef CONFIG_DEBUG_INFO_REDUCED
741KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
742 $(call cc-option,-fno-var-tracking)
743endif
744
745ifdef CONFIG_FUNCTION_TRACER
746ifndef CC_FLAGS_FTRACE
747CC_FLAGS_FTRACE := -pg
748endif
749export CC_FLAGS_FTRACE
750ifdef CONFIG_HAVE_FENTRY
751CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
752endif
753KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
754KBUILD_AFLAGS += $(CC_USING_FENTRY)
755ifdef CONFIG_DYNAMIC_FTRACE
756 ifdef CONFIG_HAVE_C_RECORDMCOUNT
757 BUILD_C_RECORDMCOUNT := y
758 export BUILD_C_RECORDMCOUNT
759 endif
760endif
761endif
762
763# We trigger additional mismatches with less inlining
764ifdef CONFIG_DEBUG_SECTION_MISMATCH
765KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
766endif
767
768# arch Makefile may override CC so keep this after arch Makefile is included
769NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
770CHECKFLAGS += $(NOSTDINC_FLAGS)
771
772# warn about C99 declaration after statement
773KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
774
775# disable pointer signed / unsigned warnings in gcc 4.0
776KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
777
778# disable invalid "can't wrap" optimizations for signed / pointers
779KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
780
781# conserve stack if available
782KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
783
784# disallow errors like 'EXPORT_GPL(foo);' with missing header
785KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
786
787# require functions to have arguments in prototypes, not empty 'int foo()'
788KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
789
790# Prohibit date/time macros, which would make the build non-deterministic
791KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
792
793# enforce correct pointer usage
794KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
795
796# use the deterministic mode of AR if available
797KBUILD_ARFLAGS := $(call ar-option,D)
798
799# check for 'asm goto'
800ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
801 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
802 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
803endif
804
805include scripts/Makefile.kasan
806include scripts/Makefile.extrawarn
807include scripts/Makefile.ubsan
808
809# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
810# last assignments
811KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
812KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
813KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
814
815# Use --build-id when available.
816LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
817 $(call cc-ldoption, -Wl$(comma)--build-id,))
818KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
819LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
820
821ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
822LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
823endif
824
825ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
826LDFLAGS_vmlinux += $(call ld-option, -X,)
827endif
828
829# Default kernel image to build when no specific target is given.
830# KBUILD_IMAGE may be overruled on the command line or
831# set in the environment
832# Also any assignments in arch/$(ARCH)/Makefile take precedence over
833# this default value
834export KBUILD_IMAGE ?= vmlinux
835
836#
837# INSTALL_PATH specifies where to place the updated kernel and system map
838# images. Default is /boot, but you can set it to other values
839export INSTALL_PATH ?= /boot
840
841#
842# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
843# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
844# an argument if needed. Otherwise it defaults to the kernel install path
845#
846export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
847
848#
849# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
850# relocations required by build roots. This is not defined in the
851# makefile but the argument can be passed to make if needed.
852#
853
854MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
855export MODLIB
856
857#
858# INSTALL_MOD_STRIP, if defined, will cause modules to be
859# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
860# the default option --strip-debug will be used. Otherwise,
861# INSTALL_MOD_STRIP value will be used as the options to the strip command.
862
863ifdef INSTALL_MOD_STRIP
864ifeq ($(INSTALL_MOD_STRIP),1)
865mod_strip_cmd = $(STRIP) --strip-debug
866else
867mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
868endif # INSTALL_MOD_STRIP=1
869else
870mod_strip_cmd = true
871endif # INSTALL_MOD_STRIP
872export mod_strip_cmd
873
874# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
875# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
876# or CONFIG_MODULE_COMPRESS_XZ.
877
878mod_compress_cmd = true
879ifdef CONFIG_MODULE_COMPRESS
880 ifdef CONFIG_MODULE_COMPRESS_GZIP
881 mod_compress_cmd = gzip -n -f
882 endif # CONFIG_MODULE_COMPRESS_GZIP
883 ifdef CONFIG_MODULE_COMPRESS_XZ
884 mod_compress_cmd = xz -f
885 endif # CONFIG_MODULE_COMPRESS_XZ
886endif # CONFIG_MODULE_COMPRESS
887export mod_compress_cmd
888
889# Select initial ramdisk compression format, default is gzip(1).
890# This shall be used by the dracut(8) tool while creating an initramfs image.
891#
892INITRD_COMPRESS-y := gzip
893INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
894INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
895INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
896INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
897INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
898# do not export INITRD_COMPRESS, since we didn't actually
899# choose a sane default compression above.
900# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
901
902ifdef CONFIG_MODULE_SIG_ALL
903$(eval $(call config_filename,MODULE_SIG_KEY))
904
905mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
906else
907mod_sign_cmd = true
908endif
909export mod_sign_cmd
910
911
912ifeq ($(KBUILD_EXTMOD),)
913core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
914
915vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
916 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
917 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
918
919vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
920 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
921
922init-y := $(patsubst %/, %/built-in.o, $(init-y))
923core-y := $(patsubst %/, %/built-in.o, $(core-y))
924drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
925net-y := $(patsubst %/, %/built-in.o, $(net-y))
926libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
927libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
928libs-y := $(libs-y1) $(libs-y2)
929virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
930
931# Externally visible symbols (used by link-vmlinux.sh)
932export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
933export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
934export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
935export LDFLAGS_vmlinux
936# used by scripts/pacmage/Makefile
937export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
938
939vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
940
941# Include targets which we want to execute sequentially if the rest of the
942# kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
943# evaluated more than once.
944PHONY += vmlinux_prereq
945vmlinux_prereq: $(vmlinux-deps) FORCE
946ifdef CONFIG_HEADERS_CHECK
947 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
948endif
949ifdef CONFIG_GDB_SCRIPTS
950 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
951endif
952ifdef CONFIG_TRIM_UNUSED_KSYMS
953 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
954 "$(MAKE) -f $(srctree)/Makefile vmlinux"
955endif
956
957# standalone target for easier testing
958include/generated/autoksyms.h: FORCE
959 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
960
961ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
962
963# Final link of vmlinux with optional arch pass after final link
964 cmd_link-vmlinux = \
965 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
966 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
967
968vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
969 +$(call if_changed,link-vmlinux)
970
971# Build samples along the rest of the kernel
972ifdef CONFIG_SAMPLES
973vmlinux-dirs += samples
974endif
975
976# The actual objects are generated when descending,
977# make sure no implicit rule kicks in
978$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
979
980# Handle descending into subdirectories listed in $(vmlinux-dirs)
981# Preset locale variables to speed up the build process. Limit locale
982# tweaks to this spot to avoid wrong language settings when running
983# make menuconfig etc.
984# Error messages still appears in the original language
985
986PHONY += $(vmlinux-dirs)
987$(vmlinux-dirs): prepare scripts
988 $(Q)$(MAKE) $(build)=$@
989
990define filechk_kernel.release
991 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
992endef
993
994# Store (new) KERNELRELEASE string in include/config/kernel.release
995include/config/kernel.release: include/config/auto.conf FORCE
996 $(call filechk,kernel.release)
997
998
999# Things we need to do before we recursively start building the kernel
1000# or the modules are listed in "prepare".
1001# A multi level approach is used. prepareN is processed before prepareN-1.
1002# archprepare is used in arch Makefiles and when processed asm symlink,
1003# version.h and scripts_basic is processed / created.
1004
1005# Listed in dependency order
1006PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1007
1008# prepare3 is used to check if we are building in a separate output directory,
1009# and if so do:
1010# 1) Check that make has not been executed in the kernel src $(srctree)
1011prepare3: include/config/kernel.release
1012ifneq ($(KBUILD_SRC),)
1013 @$(kecho) ' Using $(srctree) as source for kernel'
1014 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1015 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1016 echo >&2 " in the '$(srctree)' directory.";\
1017 /bin/false; \
1018 fi;
1019endif
1020
1021# prepare2 creates a makefile if using a separate output directory.
1022# From this point forward, .config has been reprocessed, so any rules
1023# that need to depend on updated CONFIG_* values can be checked here.
1024prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1025
1026prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1027 include/config/auto.conf
1028 $(cmd_crmodverdir)
1029
1030archprepare: archheaders archscripts prepare1 scripts_basic
1031
1032prepare0: archprepare gcc-plugins
1033 $(Q)$(MAKE) $(build)=.
1034
1035# All the preparing..
1036prepare: prepare0 prepare-objtool
1037
1038ifdef CONFIG_STACK_VALIDATION
1039 has_libelf := $(call try-run,\
1040 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1041 ifeq ($(has_libelf),1)
1042 objtool_target := tools/objtool FORCE
1043 else
1044 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1045 SKIP_STACK_VALIDATION := 1
1046 export SKIP_STACK_VALIDATION
1047 endif
1048endif
1049
1050PHONY += prepare-objtool
1051prepare-objtool: $(objtool_target)
1052
1053# Check for CONFIG flags that require compiler support. Abort the build
1054# after .config has been processed, but before the kernel build starts.
1055#
1056# For security-sensitive CONFIG options, we don't want to fallback and/or
1057# silently change which compiler flags will be used, since that leads to
1058# producing kernels with different security feature characteristics
1059# depending on the compiler used. (For example, "But I selected
1060# CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1061PHONY += prepare-compiler-check
1062prepare-compiler-check: FORCE
1063# Make sure compiler supports requested stack protector flag.
1064ifdef stackp-name
1065 ifeq ($(call cc-option, $(stackp-flag)),)
1066 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1067 $(stackp-flag) not supported by compiler >&2 && exit 1
1068 endif
1069endif
1070# Make sure compiler does not have buggy stack-protector support.
1071ifdef stackp-check
1072 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1073 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1074 $(stackp-flag) available but compiler is broken >&2 && exit 1
1075 endif
1076endif
1077 @:
1078
1079# Generate some files
1080# ---------------------------------------------------------------------------
1081
1082# KERNELRELEASE can change from a few different places, meaning version.h
1083# needs to be updated, so this check is forced on all builds
1084
1085uts_len := 64
1086define filechk_utsrelease.h
1087 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1088 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1089 exit 1; \
1090 fi; \
1091 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1092endef
1093
1094define filechk_version.h
1095 (echo \#define LINUX_VERSION_CODE $(shell \
1096 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1097 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1098endef
1099
1100$(version_h): $(srctree)/Makefile FORCE
1101 $(call filechk,version.h)
1102 $(Q)rm -f $(old_version_h)
1103
1104include/generated/utsrelease.h: include/config/kernel.release FORCE
1105 $(call filechk,utsrelease.h)
1106
1107PHONY += headerdep
1108headerdep:
1109 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1110 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1111
1112# ---------------------------------------------------------------------------
1113# Firmware install
1114INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1115export INSTALL_FW_PATH
1116
1117PHONY += firmware_install
1118firmware_install:
1119 @mkdir -p $(objtree)/firmware
1120 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1121
1122# ---------------------------------------------------------------------------
1123# Kernel headers
1124
1125#Default location for installed headers
1126export INSTALL_HDR_PATH = $(objtree)/usr
1127
1128# If we do an all arch process set dst to asm-$(hdr-arch)
1129hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1130
1131PHONY += archheaders
1132archheaders:
1133
1134PHONY += archscripts
1135archscripts:
1136
1137PHONY += __headers
1138__headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1139 $(Q)$(MAKE) $(build)=scripts build_unifdef
1140
1141PHONY += headers_install_all
1142headers_install_all:
1143 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1144
1145PHONY += headers_install
1146headers_install: __headers
1147 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1148 $(error Headers not exportable for the $(SRCARCH) architecture))
1149 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1150 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1151
1152PHONY += headers_check_all
1153headers_check_all: headers_install_all
1154 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1155
1156PHONY += headers_check
1157headers_check: headers_install
1158 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1159 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1160
1161# ---------------------------------------------------------------------------
1162# Kernel selftest
1163
1164PHONY += kselftest
1165kselftest:
1166 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1167
1168kselftest-clean:
1169 $(Q)$(MAKE) -C tools/testing/selftests clean
1170
1171PHONY += kselftest-merge
1172kselftest-merge:
1173 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1174 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1175 -m $(objtree)/.config \
1176 $(srctree)/tools/testing/selftests/*/config
1177 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1178
1179# ---------------------------------------------------------------------------
1180# Modules
1181
1182ifdef CONFIG_MODULES
1183
1184# By default, build modules as well
1185
1186all: modules
1187
1188# Build modules
1189#
1190# A module can be listed more than once in obj-m resulting in
1191# duplicate lines in modules.order files. Those are removed
1192# using awk while concatenating to the final file.
1193
1194PHONY += modules
1195modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1196 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1197 @$(kecho) ' Building modules, stage 2.';
1198 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1199 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1200
1201modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1202 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1203
1204%/modules.builtin: include/config/auto.conf
1205 $(Q)$(MAKE) $(modbuiltin)=$*
1206
1207
1208# Target to prepare building external modules
1209PHONY += modules_prepare
1210modules_prepare: prepare scripts
1211
1212# Target to install modules
1213PHONY += modules_install
1214modules_install: _modinst_ _modinst_post
1215
1216PHONY += _modinst_
1217_modinst_:
1218 @rm -rf $(MODLIB)/kernel
1219 @rm -f $(MODLIB)/source
1220 @mkdir -p $(MODLIB)/kernel
1221 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1222 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1223 rm -f $(MODLIB)/build ; \
1224 ln -s $(CURDIR) $(MODLIB)/build ; \
1225 fi
1226 @cp -f $(objtree)/modules.order $(MODLIB)/
1227 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1228 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1229
1230# This depmod is only for convenience to give the initial
1231# boot a modules.dep even before / is mounted read-write. However the
1232# boot script depmod is the master version.
1233PHONY += _modinst_post
1234_modinst_post: _modinst_
1235 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1236 $(call cmd,depmod)
1237
1238ifeq ($(CONFIG_MODULE_SIG), y)
1239PHONY += modules_sign
1240modules_sign:
1241 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1242endif
1243
1244else # CONFIG_MODULES
1245
1246# Modules not configured
1247# ---------------------------------------------------------------------------
1248
1249PHONY += modules modules_install
1250modules modules_install:
1251 @echo >&2
1252 @echo >&2 "The present kernel configuration has modules disabled."
1253 @echo >&2 "Type 'make config' and enable loadable module support."
1254 @echo >&2 "Then build a kernel with module support enabled."
1255 @echo >&2
1256 @exit 1
1257
1258endif # CONFIG_MODULES
1259
1260###
1261# Cleaning is done on three levels.
1262# make clean Delete most generated files
1263# Leave enough to build external modules
1264# make mrproper Delete the current configuration, and all generated files
1265# make distclean Remove editor backup files, patch leftover files and the like
1266
1267# Directories & files removed with 'make clean'
1268CLEAN_DIRS += $(MODVERDIR)
1269
1270# Directories & files removed with 'make mrproper'
1271MRPROPER_DIRS += include/config usr/include include/generated \
1272 arch/*/include/generated .tmp_objdiff
1273MRPROPER_FILES += .config .config.old .version .old_version \
1274 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1275 signing_key.pem signing_key.priv signing_key.x509 \
1276 x509.genkey extra_certificates signing_key.x509.keyid \
1277 signing_key.x509.signer vmlinux-gdb.py
1278
1279# clean - Delete most, but leave enough to build external modules
1280#
1281clean: rm-dirs := $(CLEAN_DIRS)
1282clean: rm-files := $(CLEAN_FILES)
1283clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1284
1285PHONY += $(clean-dirs) clean archclean vmlinuxclean
1286$(clean-dirs):
1287 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1288
1289vmlinuxclean:
1290 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1291 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1292
1293clean: archclean vmlinuxclean
1294
1295# mrproper - Delete all generated files, including .config
1296#
1297mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1298mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1299mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1300
1301PHONY += $(mrproper-dirs) mrproper archmrproper
1302$(mrproper-dirs):
1303 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1304
1305mrproper: clean archmrproper $(mrproper-dirs)
1306 $(call cmd,rmdirs)
1307 $(call cmd,rmfiles)
1308
1309# distclean
1310#
1311PHONY += distclean
1312
1313distclean: mrproper
1314 @find $(srctree) $(RCS_FIND_IGNORE) \
1315 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1316 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1317 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1318 -type f -print | xargs rm -f
1319
1320
1321# Packaging of the kernel to various formats
1322# ---------------------------------------------------------------------------
1323# rpm target kept for backward compatibility
1324package-dir := scripts/package
1325
1326%src-pkg: FORCE
1327 $(Q)$(MAKE) $(build)=$(package-dir) $@
1328%pkg: include/config/kernel.release FORCE
1329 $(Q)$(MAKE) $(build)=$(package-dir) $@
1330rpm: include/config/kernel.release FORCE
1331 $(Q)$(MAKE) $(build)=$(package-dir) $@
1332
1333
1334# Brief documentation of the typical targets used
1335# ---------------------------------------------------------------------------
1336
1337boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1338boards := $(sort $(notdir $(boards)))
1339board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1340board-dirs := $(sort $(notdir $(board-dirs:/=)))
1341
1342PHONY += help
1343help:
1344 @echo 'Cleaning targets:'
1345 @echo ' clean - Remove most generated files but keep the config and'
1346 @echo ' enough build support to build external modules'
1347 @echo ' mrproper - Remove all generated files + config + various backup files'
1348 @echo ' distclean - mrproper + remove editor backup and patch files'
1349 @echo ''
1350 @echo 'Configuration targets:'
1351 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1352 @echo ''
1353 @echo 'Other generic targets:'
1354 @echo ' all - Build all targets marked with [*]'
1355 @echo '* vmlinux - Build the bare kernel'
1356 @echo '* modules - Build all modules'
1357 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1358 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1359 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1360 @echo ' dir/ - Build all files in dir and below'
1361 @echo ' dir/file.[ois] - Build specified target only'
1362 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1363 @echo ' (requires a recent binutils and recent build (System.map))'
1364 @echo ' dir/file.ko - Build module including final link'
1365 @echo ' modules_prepare - Set up for building external modules'
1366 @echo ' tags/TAGS - Generate tags file for editors'
1367 @echo ' cscope - Generate cscope index'
1368 @echo ' gtags - Generate GNU GLOBAL index'
1369 @echo ' kernelrelease - Output the release version string (use with make -s)'
1370 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1371 @echo ' image_name - Output the image name (use with make -s)'
1372 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1373 echo ' (default: $(INSTALL_HDR_PATH))'; \
1374 echo ''
1375 @echo 'Static analysers'
1376 @echo ' checkstack - Generate a list of stack hogs'
1377 @echo ' namespacecheck - Name space analysis on compiled kernel'
1378 @echo ' versioncheck - Sanity check on version.h usage'
1379 @echo ' includecheck - Check for duplicate included header files'
1380 @echo ' export_report - List the usages of all exported symbols'
1381 @echo ' headers_check - Sanity check on exported headers'
1382 @echo ' headerdep - Detect inclusion cycles in headers'
1383 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1384 @echo ''
1385 @echo 'Kernel selftest'
1386 @echo ' kselftest - Build and run kernel selftest (run as root)'
1387 @echo ' Build, install, and boot kernel before'
1388 @echo ' running kselftest on it'
1389 @echo ' kselftest-clean - Remove all generated kselftest files'
1390 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1391 @echo ' .config.'
1392 @echo ''
1393 @echo 'Kernel packaging:'
1394 @$(MAKE) $(build)=$(package-dir) help
1395 @echo ''
1396 @echo 'Documentation targets:'
1397 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1398 @echo ''
1399 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1400 @echo ''
1401 @echo 'Architecture specific targets ($(SRCARCH)):'
1402 @$(if $(archhelp),$(archhelp),\
1403 echo ' No architecture specific help defined for $(SRCARCH)')
1404 @echo ''
1405 @$(if $(boards), \
1406 $(foreach b, $(boards), \
1407 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1408 echo '')
1409 @$(if $(board-dirs), \
1410 $(foreach b, $(board-dirs), \
1411 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1412 printf " %-16s - Show all of the above\\n" help-boards; \
1413 echo '')
1414
1415 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1416 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1417 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1418 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1419 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1420 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1421 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1422 @echo ' 1: warnings which may be relevant and do not occur too often'
1423 @echo ' 2: warnings which occur quite often but may still be relevant'
1424 @echo ' 3: more obscure warnings, can most likely be ignored'
1425 @echo ' Multiple levels can be combined with W=12 or W=123'
1426 @echo ''
1427 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1428 @echo 'For further info see the ./README file'
1429
1430
1431help-board-dirs := $(addprefix help-,$(board-dirs))
1432
1433help-boards: $(help-board-dirs)
1434
1435boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1436
1437$(help-board-dirs): help-%:
1438 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1439 @$(if $(boards-per-dir), \
1440 $(foreach b, $(boards-per-dir), \
1441 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1442 echo '')
1443
1444
1445# Documentation targets
1446# ---------------------------------------------------------------------------
1447DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1448PHONY += $(DOC_TARGETS)
1449$(DOC_TARGETS): scripts_basic FORCE
1450 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1451 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1452 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1453
1454else # KBUILD_EXTMOD
1455
1456###
1457# External module support.
1458# When building external modules the kernel used as basis is considered
1459# read-only, and no consistency checks are made and the make
1460# system is not used on the basis kernel. If updates are required
1461# in the basis kernel ordinary make commands (without M=...) must
1462# be used.
1463#
1464# The following are the only valid targets when building external
1465# modules.
1466# make M=dir clean Delete all automatically generated files
1467# make M=dir modules Make all modules in specified dir
1468# make M=dir Same as 'make M=dir modules'
1469# make M=dir modules_install
1470# Install the modules built in the module directory
1471# Assumes install directory is already created
1472
1473# We are always building modules
1474KBUILD_MODULES := 1
1475PHONY += crmodverdir
1476crmodverdir:
1477 $(cmd_crmodverdir)
1478
1479PHONY += $(objtree)/Module.symvers
1480$(objtree)/Module.symvers:
1481 @test -e $(objtree)/Module.symvers || ( \
1482 echo; \
1483 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1484 echo " is missing; modules will have no dependencies and modversions."; \
1485 echo )
1486
1487module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1488PHONY += $(module-dirs) modules
1489$(module-dirs): crmodverdir $(objtree)/Module.symvers
1490 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1491
1492modules: $(module-dirs)
1493 @$(kecho) ' Building modules, stage 2.';
1494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1495
1496PHONY += modules_install
1497modules_install: _emodinst_ _emodinst_post
1498
1499install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1500PHONY += _emodinst_
1501_emodinst_:
1502 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1503 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1504
1505PHONY += _emodinst_post
1506_emodinst_post: _emodinst_
1507 $(call cmd,depmod)
1508
1509clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1510
1511PHONY += $(clean-dirs) clean
1512$(clean-dirs):
1513 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1514
1515clean: rm-dirs := $(MODVERDIR)
1516clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1517
1518PHONY += help
1519help:
1520 @echo ' Building external modules.'
1521 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1522 @echo ''
1523 @echo ' modules - default target, build the module(s)'
1524 @echo ' modules_install - install the module'
1525 @echo ' clean - remove generated files in module directory only'
1526 @echo ''
1527
1528# Dummies...
1529PHONY += prepare scripts
1530prepare: ;
1531scripts: ;
1532endif # KBUILD_EXTMOD
1533
1534clean: $(clean-dirs)
1535 $(call cmd,rmdirs)
1536 $(call cmd,rmfiles)
1537 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1538 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1539 -o -name '*.ko.*' \
1540 -o -name '*.dwo' \
1541 -o -name '*.su' \
1542 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1543 -o -name '*.symtypes' -o -name 'modules.order' \
1544 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1545 -o -name '*.c.[012]*.*' \
1546 -o -name '*.gcno' \) -type f -print | xargs rm -f
1547
1548# Generate tags for editors
1549# ---------------------------------------------------------------------------
1550quiet_cmd_tags = GEN $@
1551 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1552
1553tags TAGS cscope gtags: FORCE
1554 $(call cmd,tags)
1555
1556# Scripts to check various things for consistency
1557# ---------------------------------------------------------------------------
1558
1559PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1560
1561includecheck:
1562 find $(srctree)/* $(RCS_FIND_IGNORE) \
1563 -name '*.[hcS]' -type f -print | sort \
1564 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1565
1566versioncheck:
1567 find $(srctree)/* $(RCS_FIND_IGNORE) \
1568 -name '*.[hcS]' -type f -print | sort \
1569 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1570
1571coccicheck:
1572 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1573
1574namespacecheck:
1575 $(PERL) $(srctree)/scripts/namespace.pl
1576
1577export_report:
1578 $(PERL) $(srctree)/scripts/export_report.pl
1579
1580endif #ifeq ($(config-targets),1)
1581endif #ifeq ($(mixed-targets),1)
1582
1583PHONY += checkstack kernelrelease kernelversion image_name
1584
1585# UML needs a little special treatment here. It wants to use the host
1586# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1587# else wants $(ARCH), including people doing cross-builds, which means
1588# that $(SUBARCH) doesn't work here.
1589ifeq ($(ARCH), um)
1590CHECKSTACK_ARCH := $(SUBARCH)
1591else
1592CHECKSTACK_ARCH := $(ARCH)
1593endif
1594checkstack:
1595 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1596 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1597
1598kernelrelease:
1599 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1600
1601kernelversion:
1602 @echo $(KERNELVERSION)
1603
1604image_name:
1605 @echo $(KBUILD_IMAGE)
1606
1607# Clear a bunch of variables before executing the submake
1608tools/: FORCE
1609 $(Q)mkdir -p $(objtree)/tools
1610 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1611
1612tools/%: FORCE
1613 $(Q)mkdir -p $(objtree)/tools
1614 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1615
1616# Single targets
1617# ---------------------------------------------------------------------------
1618# Single targets are compatible with:
1619# - build with mixed source and output
1620# - build with separate output dir 'make O=...'
1621# - external modules
1622#
1623# target-dir => where to store outputfile
1624# build-dir => directory in kernel source tree to use
1625
1626ifeq ($(KBUILD_EXTMOD),)
1627 build-dir = $(patsubst %/,%,$(dir $@))
1628 target-dir = $(dir $@)
1629else
1630 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1631 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1632 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1633endif
1634
1635%.s: %.c prepare scripts FORCE
1636 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1637%.i: %.c prepare scripts FORCE
1638 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1639%.o: %.c prepare scripts FORCE
1640 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1641%.lst: %.c prepare scripts FORCE
1642 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1643%.s: %.S prepare scripts FORCE
1644 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1645%.o: %.S prepare scripts FORCE
1646 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1647%.symtypes: %.c prepare scripts FORCE
1648 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1649
1650# Modules
1651/: prepare scripts FORCE
1652 $(cmd_crmodverdir)
1653 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1654 $(build)=$(build-dir)
1655# Make sure the latest headers are built for Documentation
1656Documentation/ samples/: headers_install
1657%/: prepare scripts FORCE
1658 $(cmd_crmodverdir)
1659 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1660 $(build)=$(build-dir)
1661%.ko: prepare scripts FORCE
1662 $(cmd_crmodverdir)
1663 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1664 $(build)=$(build-dir) $(@:.ko=.o)
1665 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1666
1667# FIXME Should go into a make.lib or something
1668# ===========================================================================
1669
1670quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1671 cmd_rmdirs = rm -rf $(rm-dirs)
1672
1673quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1674 cmd_rmfiles = rm -f $(rm-files)
1675
1676# Run depmod only if we have System.map and depmod is executable
1677quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1678 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1679 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1680
1681# Create temporary dir for module support files
1682# clean it up only when building all modules
1683cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1684 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1685
1686# read all saved command lines
1687
1688targets := $(wildcard $(sort $(targets)))
1689cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1690
1691ifneq ($(cmd_files),)
1692 $(cmd_files): ; # Do not try to update included dependency files
1693 include $(cmd_files)
1694endif
1695
1696endif # skip-makefile
1697
1698PHONY += FORCE
1699FORCE:
1700
1701# Declare the contents of the .PHONY variable as phony. We keep that
1702# information in a variable so we can use it in if_changed and friends.
1703.PHONY: $(PHONY)