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1 VERSION = 4
2 PATCHLEVEL = 10
3 SUBLEVEL = 3
4 EXTRAVERSION =
5 NAME = Fearless Coyote
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
16 MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18 # Avoid funny character set dependencies
19 unexport LC_ALL
20 LC_COLLATE=C
21 LC_NUMERIC=C
22 export LC_COLLATE LC_NUMERIC
23
24 # Avoid interference with shell env settings
25 unexport 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 $@ :<
62 #
63 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
65 #
66 # To put more focus on warnings, be less verbose as default
67 # Use 'make V=1' to see the full commands
68
69 ifeq ("$(origin V)", "command line")
70 KBUILD_VERBOSE = $(V)
71 endif
72 ifndef KBUILD_VERBOSE
73 KBUILD_VERBOSE = 0
74 endif
75
76 ifeq ($(KBUILD_VERBOSE),1)
77 quiet =
78 Q =
79 else
80 quiet=quiet_
81 Q = @
82 endif
83
84 # If the user is running make -s (silent mode), suppress echoing of
85 # commands
86
87 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
88 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89 quiet=silent_
90 endif
91 else # make-3.8x
92 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93 quiet=silent_
94 endif
95 endif
96
97 export quiet Q KBUILD_VERBOSE
98
99 # kbuild supports saving output files in a separate directory.
100 # To locate output files in a separate directory two syntaxes are supported.
101 # In both cases the working directory must be the root of the kernel src.
102 # 1) O=
103 # Use "make O=dir/to/store/output/files/"
104 #
105 # 2) Set KBUILD_OUTPUT
106 # Set the environment variable KBUILD_OUTPUT to point to the directory
107 # where the output files shall be placed.
108 # export KBUILD_OUTPUT=dir/to/store/output/files/
109 # make
110 #
111 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
112 # variable.
113
114 # KBUILD_SRC is set on invocation of make in OBJ directory
115 # KBUILD_SRC is not intended to be used by the regular user (for now)
116 ifeq ($(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?
120 ifeq ("$(origin O)", "command line")
121 KBUILD_OUTPUT := $(O)
122 endif
123
124 # That's our default target when none is given on the command line
125 PHONY := _all
126 _all:
127
128 # Cancel implicit rules on top Makefile
129 $(CURDIR)/Makefile Makefile: ;
130
131 ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132 $(error main directory cannot contain spaces nor colons)
133 endif
134
135 ifneq ($(KBUILD_OUTPUT),)
136 # Invoke a second make in the output directory, passing relevant variables
137 # check that the output directory actually exists
138 saved-output := $(KBUILD_OUTPUT)
139 KBUILD_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
144 PHONY += $(MAKECMDGOALS) sub-make
145
146 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
147 @:
148
149 sub-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
154 skip-makefile := 1
155 endif # ifneq ($(KBUILD_OUTPUT),)
156 endif # ifeq ($(KBUILD_SRC),)
157
158 # We process the rest of the Makefile if this is the final invocation of make
159 ifeq ($(skip-makefile),)
160
161 # Do not print "Entering directory ...",
162 # but we want to display it when entering to the output directory
163 # so that IDEs/editors are able to understand relative filenames.
164 MAKEFLAGS += --no-print-directory
165
166 # Call a source code checker (by default, "sparse") as part of the
167 # C compilation.
168 #
169 # Use 'make C=1' to enable checking of only re-compiled files.
170 # Use 'make C=2' to enable checking of *all* source files, regardless
171 # of whether they are re-compiled or not.
172 #
173 # See the file "Documentation/sparse.txt" for more details, including
174 # where to get the "sparse" utility.
175
176 ifeq ("$(origin C)", "command line")
177 KBUILD_CHECKSRC = $(C)
178 endif
179 ifndef KBUILD_CHECKSRC
180 KBUILD_CHECKSRC = 0
181 endif
182
183 # Call message checker as part of the C compilation
184 #
185 # Use 'make D=1' to enable checking
186 # Use 'make D=2' to create the message catalog
187
188 ifdef D
189 ifeq ("$(origin D)", "command line")
190 KBUILD_KMSG_CHECK = $(D)
191 endif
192 endif
193 ifndef KBUILD_KMSG_CHECK
194 KBUILD_KMSG_CHECK = 0
195 endif
196
197 # Use make M=dir to specify directory of external module to build
198 # Old syntax make ... SUBDIRS=$PWD is still supported
199 # Setting the environment variable KBUILD_EXTMOD take precedence
200 ifdef SUBDIRS
201 KBUILD_EXTMOD ?= $(SUBDIRS)
202 endif
203
204 ifeq ("$(origin M)", "command line")
205 KBUILD_EXTMOD := $(M)
206 endif
207
208 # If building an external module we do not care about the all: rule
209 # but instead _all depend on modules
210 PHONY += all
211 ifeq ($(KBUILD_EXTMOD),)
212 _all: all
213 else
214 _all: modules
215 endif
216
217 ifeq ($(KBUILD_SRC),)
218 # building in the source tree
219 srctree := .
220 else
221 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
222 # building in a subdirectory of the source tree
223 srctree := ..
224 else
225 srctree := $(KBUILD_SRC)
226 endif
227 endif
228 objtree := .
229 src := $(srctree)
230 obj := $(objtree)
231
232 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
233
234 export srctree objtree VPATH
235
236 # SUBARCH tells the usermode build what the underlying arch is. That is set
237 # first, and if a usermode build is happening, the "ARCH=um" on the command
238 # line overrides the setting of ARCH below. If a native build is happening,
239 # then ARCH is assigned, getting whatever value it gets normally, and
240 # SUBARCH is subsequently ignored.
241
242 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
243 -e s/sun4u/sparc64/ \
244 -e s/arm.*/arm/ -e s/sa110/arm/ \
245 -e s/s390x/s390/ -e s/parisc64/parisc/ \
246 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
247 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
248
249 # Cross compiling and selecting different set of gcc/bin-utils
250 # ---------------------------------------------------------------------------
251 #
252 # When performing cross compilation for other architectures ARCH shall be set
253 # to the target architecture. (See arch/* for the possibilities).
254 # ARCH can be set during invocation of make:
255 # make ARCH=ia64
256 # Another way is to have ARCH set in the environment.
257 # The default ARCH is the host where make is executed.
258
259 # CROSS_COMPILE specify the prefix used for all executables used
260 # during compilation. Only gcc and related bin-utils executables
261 # are prefixed with $(CROSS_COMPILE).
262 # CROSS_COMPILE can be set on the command line
263 # make CROSS_COMPILE=ia64-linux-
264 # Alternatively CROSS_COMPILE can be set in the environment.
265 # A third alternative is to store a setting in .config so that plain
266 # "make" in the configured kernel build directory always uses that.
267 # Default value for CROSS_COMPILE is not to prefix executables
268 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
269 ARCH ?= $(SUBARCH)
270 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
271
272 # Architecture as present in compile.h
273 UTS_MACHINE := $(ARCH)
274 SRCARCH := $(ARCH)
275
276 # Additional ARCH settings for x86
277 ifeq ($(ARCH),i386)
278 SRCARCH := x86
279 endif
280 ifeq ($(ARCH),x86_64)
281 SRCARCH := x86
282 endif
283
284 # Additional ARCH settings for sparc
285 ifeq ($(ARCH),sparc32)
286 SRCARCH := sparc
287 endif
288 ifeq ($(ARCH),sparc64)
289 SRCARCH := sparc
290 endif
291
292 # Additional ARCH settings for sh
293 ifeq ($(ARCH),sh64)
294 SRCARCH := sh
295 endif
296
297 # Additional ARCH settings for tile
298 ifeq ($(ARCH),tilepro)
299 SRCARCH := tile
300 endif
301 ifeq ($(ARCH),tilegx)
302 SRCARCH := tile
303 endif
304
305 # Where to locate arch specific headers
306 hdr-arch := $(SRCARCH)
307
308 KCONFIG_CONFIG ?= .config
309 export KCONFIG_CONFIG
310
311 # SHELL used by kbuild
312 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
313 else if [ -x /bin/bash ]; then echo /bin/bash; \
314 else echo sh; fi ; fi)
315
316 HOSTCC = gcc
317 HOSTCXX = g++
318 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
319 HOSTCXXFLAGS = -O2
320
321 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
322 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
323 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
324 endif
325
326 # Decide whether to build built-in, modular, or both.
327 # Normally, just do built-in.
328
329 KBUILD_MODULES :=
330 KBUILD_BUILTIN := 1
331
332 # If we have only "make modules", don't compile built-in objects.
333 # When we're building modules with modversions, we need to consider
334 # the built-in objects during the descend as well, in order to
335 # make sure the checksums are up to date before we record them.
336
337 ifeq ($(MAKECMDGOALS),modules)
338 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
339 endif
340
341 # If we have "make <whatever> modules", compile modules
342 # in addition to whatever we do anyway.
343 # Just "make" or "make all" shall build modules as well
344
345 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
346 KBUILD_MODULES := 1
347 endif
348
349 ifeq ($(MAKECMDGOALS),)
350 KBUILD_MODULES := 1
351 endif
352
353 export KBUILD_MODULES KBUILD_BUILTIN
354 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
355
356 # We need some generic definitions (do not try to remake the file).
357 scripts/Kbuild.include: ;
358 include scripts/Kbuild.include
359
360 # Make variables (CC, etc...)
361 AS = $(CROSS_COMPILE)as
362 LD = $(CROSS_COMPILE)ld
363 CC = $(CROSS_COMPILE)gcc
364 CPP = $(CC) -E
365 AR = $(CROSS_COMPILE)ar
366 NM = $(CROSS_COMPILE)nm
367 STRIP = $(CROSS_COMPILE)strip
368 OBJCOPY = $(CROSS_COMPILE)objcopy
369 OBJDUMP = $(CROSS_COMPILE)objdump
370 AWK = awk
371 GENKSYMS = scripts/genksyms/genksyms
372 INSTALLKERNEL := installkernel
373 DEPMOD = /sbin/depmod
374 PERL = perl
375 PYTHON = python
376 CHECK = sparse
377
378 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
379 -Wbitwise -Wno-return-void $(CF)
380 KMSG_CHECK = $(srctree)/scripts/kmsg-doc
381 NOSTDINC_FLAGS =
382 CFLAGS_MODULE =
383 AFLAGS_MODULE =
384 LDFLAGS_MODULE =
385 CFLAGS_KERNEL =
386 AFLAGS_KERNEL =
387 LDFLAGS_vmlinux =
388 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage -fno-tree-loop-im -Wno-maybe-uninitialized
389 CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
390
391 # Prefer linux-backports-modules
392 ifneq ($(KBUILD_SRC),)
393 ifneq ($(shell if test -e $(KBUILD_OUTPUT)/ubuntu-build; then echo yes; fi),yes)
394 UBUNTUINCLUDE := -I/usr/src/linux-headers-lbm-$(KERNELRELEASE)
395 endif
396 endif
397
398 # Use USERINCLUDE when you must reference the UAPI directories only.
399 USERINCLUDE := \
400 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
401 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
402 -I$(srctree)/include/uapi \
403 -I$(objtree)/include/generated/uapi \
404 -include $(srctree)/include/linux/kconfig.h
405
406 # Use LINUXINCLUDE when you must reference the include/ directory.
407 # Needed to be compatible with the O= option
408 LINUXINCLUDE := \
409 $(UBUNTUINCLUDE) \
410 -I$(srctree)/arch/$(hdr-arch)/include \
411 -I$(objtree)/arch/$(hdr-arch)/include/generated/uapi \
412 -I$(objtree)/arch/$(hdr-arch)/include/generated \
413 $(if $(KBUILD_SRC), -I$(srctree)/include) \
414 -I$(objtree)/include
415
416 LINUXINCLUDE += $(filter-out $(LINUXINCLUDE),$(USERINCLUDE))
417
418 # UBUNTU: Include our third party driver stuff too
419 LINUXINCLUDE += -Iubuntu/include $(if $(KBUILD_SRC),-I$(srctree)/ubuntu/include)
420
421 KBUILD_CPPFLAGS := -D__KERNEL__
422
423 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
424 -fno-strict-aliasing -fno-common \
425 -Werror-implicit-function-declaration \
426 -Wno-format-security \
427 -std=gnu89 $(call cc-option,-fno-PIE)
428
429
430 KBUILD_AFLAGS_KERNEL :=
431 KBUILD_CFLAGS_KERNEL :=
432 KBUILD_AFLAGS := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
433 KBUILD_AFLAGS_MODULE := -DMODULE
434 KBUILD_CFLAGS_MODULE := -DMODULE
435 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
436
437 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
438 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
439 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
440
441 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
442 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
443 export CPP AR NM STRIP OBJCOPY OBJDUMP
444 export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
445 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
446
447 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
448 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KCOV CFLAGS_KASAN CFLAGS_UBSAN
449 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
450 export KBUILD_KMSG_CHECK KMSG_CHECK
451 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
452 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
453 export KBUILD_ARFLAGS
454
455 # When compiling out-of-tree modules, put MODVERDIR in the module
456 # tree rather than in the kernel tree. The kernel tree might
457 # even be read-only.
458 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
459
460 # Files to ignore in find ... statements
461
462 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
463 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
464 -prune -o
465 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
466 --exclude CVS --exclude .pc --exclude .hg --exclude .git
467
468 # ===========================================================================
469 # Rules shared between *config targets and build targets
470
471 # Basic helpers built in scripts/
472 PHONY += scripts_basic
473 scripts_basic:
474 $(Q)$(MAKE) $(build)=scripts/basic
475 $(Q)rm -f .tmp_quiet_recordmcount
476
477 # To avoid any implicit rule to kick in, define an empty command.
478 scripts/basic/%: scripts_basic ;
479
480 PHONY += outputmakefile
481 # outputmakefile generates a Makefile in the output directory, if using a
482 # separate output directory. This allows convenient use of make in the
483 # output directory.
484 outputmakefile:
485 ifneq ($(KBUILD_SRC),)
486 $(Q)ln -fsn $(srctree) source
487 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
488 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
489 endif
490
491 # Support for using generic headers in asm-generic
492 PHONY += asm-generic
493 asm-generic:
494 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
495 src=asm obj=arch/$(SRCARCH)/include/generated/asm
496 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
497 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
498
499 # To make sure we do not include .config for any of the *config targets
500 # catch them early, and hand them over to scripts/kconfig/Makefile
501 # It is allowed to specify more targets when calling make, including
502 # mixing *config targets and build targets.
503 # For example 'make oldconfig all'.
504 # Detect when mixed targets is specified, and make a second invocation
505 # of make so .config is not included in this case either (for *config).
506
507 version_h := include/generated/uapi/linux/version.h
508 old_version_h := include/linux/version.h
509
510 no-dot-config-targets := clean mrproper distclean \
511 cscope gtags TAGS tags help% %docs check% coccicheck \
512 $(version_h) headers_% archheaders archscripts \
513 kernelversion %src-pkg
514
515 config-targets := 0
516 mixed-targets := 0
517 dot-config := 1
518
519 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
520 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
521 dot-config := 0
522 endif
523 endif
524
525 ifeq ($(KBUILD_EXTMOD),)
526 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
527 config-targets := 1
528 ifneq ($(words $(MAKECMDGOALS)),1)
529 mixed-targets := 1
530 endif
531 endif
532 endif
533 # install and module_install need also be processed one by one
534 ifneq ($(filter install,$(MAKECMDGOALS)),)
535 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
536 mixed-targets := 1
537 endif
538 endif
539
540 ifeq ($(mixed-targets),1)
541 # ===========================================================================
542 # We're called with mixed targets (*config and build targets).
543 # Handle them one by one.
544
545 PHONY += $(MAKECMDGOALS) __build_one_by_one
546
547 $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
548 @:
549
550 __build_one_by_one:
551 $(Q)set -e; \
552 for i in $(MAKECMDGOALS); do \
553 $(MAKE) -f $(srctree)/Makefile $$i; \
554 done
555
556 else
557 ifeq ($(config-targets),1)
558 # ===========================================================================
559 # *config targets only - make sure prerequisites are updated, and descend
560 # in scripts/kconfig to make the *config target
561
562 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
563 # KBUILD_DEFCONFIG may point out an alternative default configuration
564 # used for 'make defconfig'
565 include arch/$(SRCARCH)/Makefile
566 export KBUILD_DEFCONFIG KBUILD_KCONFIG
567
568 config: scripts_basic outputmakefile FORCE
569 $(Q)$(MAKE) $(build)=scripts/kconfig $@
570
571 %config: scripts_basic outputmakefile FORCE
572 $(Q)$(MAKE) $(build)=scripts/kconfig $@
573
574 else
575 # ===========================================================================
576 # Build targets only - this includes vmlinux, arch specific targets, clean
577 # targets and others. In general all targets except *config targets.
578
579 ifeq ($(KBUILD_EXTMOD),)
580 # Additional helpers built in scripts/
581 # Carefully list dependencies so we do not try to build scripts twice
582 # in parallel
583 PHONY += scripts
584 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
585 asm-generic gcc-plugins
586 $(Q)$(MAKE) $(build)=$(@)
587
588 # Objects we will link into vmlinux / subdirs we need to visit
589 init-y := init/
590 drivers-y := drivers/ sound/ firmware/ ubuntu/
591 net-y := net/
592 libs-y := lib/
593 core-y := usr/
594 virt-y := virt/
595 endif # KBUILD_EXTMOD
596
597 ifeq ($(dot-config),1)
598 # Read in config
599 -include include/config/auto.conf
600
601 ifeq ($(KBUILD_EXTMOD),)
602 # Read in dependencies to all Kconfig* files, make sure to run
603 # oldconfig if changes are detected.
604 -include include/config/auto.conf.cmd
605
606 # To avoid any implicit rule to kick in, define an empty command
607 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
608
609 # If .config is newer than include/config/auto.conf, someone tinkered
610 # with it and forgot to run make oldconfig.
611 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
612 # we execute the config step to be sure to catch updated Kconfig files
613 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
614 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
615 else
616 # external modules needs include/generated/autoconf.h and include/config/auto.conf
617 # but do not care if they are up-to-date. Use auto.conf to trigger the test
618 PHONY += include/config/auto.conf
619
620 include/config/auto.conf:
621 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
622 echo >&2; \
623 echo >&2 " ERROR: Kernel configuration is invalid."; \
624 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
625 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
626 echo >&2 ; \
627 /bin/false)
628
629 endif # KBUILD_EXTMOD
630
631 else
632 # Dummy target needed, because used as prerequisite
633 include/config/auto.conf: ;
634 endif # $(dot-config)
635
636 # For the kernel to actually contain only the needed exported symbols,
637 # we have to build modules as well to determine what those symbols are.
638 # (this can be evaluated only once include/config/auto.conf has been included)
639 ifdef CONFIG_TRIM_UNUSED_KSYMS
640 KBUILD_MODULES := 1
641 endif
642
643 # The all: target is the default when no target is given on the
644 # command line.
645 # This allow a user to issue only 'make' to build a kernel including modules
646 # Defaults to vmlinux, but the arch makefile usually adds further targets
647 all: vmlinux
648
649 # force no-pie for distro compilers that enable pie by default
650 KBUILD_CFLAGS += $(call cc-option, -fno-pie)
651 KBUILD_CFLAGS += $(call cc-option, -no-pie)
652 KBUILD_AFLAGS += $(call cc-option, -fno-pie)
653 KBUILD_CPPFLAGS += $(call cc-option, -fno-pie)
654
655 # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
656 # values of the respective KBUILD_* variables
657 ARCH_CPPFLAGS :=
658 ARCH_AFLAGS :=
659 ARCH_CFLAGS :=
660 include arch/$(SRCARCH)/Makefile
661
662 KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
663 KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
664
665 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
666 KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
667 KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
668 endif
669
670 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
671 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
672 else
673 ifdef CONFIG_PROFILE_ALL_BRANCHES
674 KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
675 else
676 KBUILD_CFLAGS += -O2
677 endif
678 endif
679
680 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
681 $(call cc-disable-warning,maybe-uninitialized,))
682
683 # Tell gcc to never replace conditional load with a non-conditional one
684 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
685
686 include scripts/Makefile.gcc-plugins
687
688 ifdef CONFIG_READABLE_ASM
689 # Disable optimizations that make assembler listings hard to read.
690 # reorder blocks reorders the control in the function
691 # ipa clone creates specialized cloned functions
692 # partial inlining inlines only parts of functions
693 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
694 $(call cc-option,-fno-ipa-cp-clone,) \
695 $(call cc-option,-fno-partial-inlining)
696 endif
697
698 ifneq ($(CONFIG_FRAME_WARN),0)
699 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
700 endif
701
702 # This selects the stack protector compiler flag. Testing it is delayed
703 # until after .config has been reprocessed, in the prepare-compiler-check
704 # target.
705 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
706 stackp-flag := -fstack-protector
707 stackp-name := REGULAR
708 else
709 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
710 stackp-flag := -fstack-protector-strong
711 stackp-name := STRONG
712 else
713 # Force off for distro compilers that enable stack protector by default.
714 stackp-flag := $(call cc-option, -fno-stack-protector)
715 endif
716 endif
717 # Find arch-specific stack protector compiler sanity-checking script.
718 ifdef CONFIG_CC_STACKPROTECTOR
719 stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
720 stackp-check := $(wildcard $(stackp-path))
721 endif
722 KBUILD_CFLAGS += $(stackp-flag)
723
724 ifeq ($(cc-name),clang)
725 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
726 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
727 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
728 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
729 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
730 # Quiet clang warning: comparison of unsigned expression < 0 is always false
731 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
732 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
733 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
734 # See modpost pattern 2
735 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
736 KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
737 else
738
739 # These warnings generated too much noise in a regular build.
740 # Use make W=1 to enable them (see scripts/Makefile.build)
741 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
742 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
743 endif
744
745 ifdef CONFIG_FRAME_POINTER
746 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
747 else
748 # Some targets (ARM with Thumb2, for example), can't be built with frame
749 # pointers. For those, we don't have FUNCTION_TRACER automatically
750 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
751 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
752 # -fomit-frame-pointer with FUNCTION_TRACER.
753 ifndef CONFIG_FUNCTION_TRACER
754 KBUILD_CFLAGS += -fomit-frame-pointer
755 endif
756 endif
757
758 KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
759
760 ifdef CONFIG_DEBUG_INFO
761 ifdef CONFIG_DEBUG_INFO_SPLIT
762 KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
763 else
764 KBUILD_CFLAGS += -g
765 endif
766 KBUILD_AFLAGS += -Wa,-gdwarf-2
767 endif
768 ifdef CONFIG_DEBUG_INFO_DWARF4
769 KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
770 endif
771
772 ifdef CONFIG_DEBUG_INFO_REDUCED
773 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
774 $(call cc-option,-fno-var-tracking)
775 endif
776
777 ifdef CONFIG_FUNCTION_TRACER
778 ifndef CC_FLAGS_FTRACE
779 CC_FLAGS_FTRACE := -pg
780 endif
781 export CC_FLAGS_FTRACE
782 ifdef CONFIG_HAVE_FENTRY
783 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
784 endif
785 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
786 KBUILD_AFLAGS += $(CC_USING_FENTRY)
787 ifdef CONFIG_DYNAMIC_FTRACE
788 ifdef CONFIG_HAVE_C_RECORDMCOUNT
789 BUILD_C_RECORDMCOUNT := y
790 export BUILD_C_RECORDMCOUNT
791 endif
792 endif
793 endif
794
795 # We trigger additional mismatches with less inlining
796 ifdef CONFIG_DEBUG_SECTION_MISMATCH
797 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
798 endif
799
800 # arch Makefile may override CC so keep this after arch Makefile is included
801 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
802 CHECKFLAGS += $(NOSTDINC_FLAGS)
803
804 # warn about C99 declaration after statement
805 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
806
807 # disable pointer signed / unsigned warnings in gcc 4.0
808 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
809
810 # disable invalid "can't wrap" optimizations for signed / pointers
811 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
812
813 # conserve stack if available
814 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
815
816 # disallow errors like 'EXPORT_GPL(foo);' with missing header
817 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
818
819 # require functions to have arguments in prototypes, not empty 'int foo()'
820 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
821
822 # Prohibit date/time macros, which would make the build non-deterministic
823 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
824
825 # enforce correct pointer usage
826 KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
827
828 # use the deterministic mode of AR if available
829 KBUILD_ARFLAGS := $(call ar-option,D)
830
831 # check for 'asm goto'
832 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
833 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
834 KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
835 endif
836
837 include scripts/Makefile.kasan
838 include scripts/Makefile.extrawarn
839 include scripts/Makefile.ubsan
840
841 # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
842 # last assignments
843 KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
844 KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
845 KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
846
847 # Use --build-id when available.
848 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
849 $(call cc-ldoption, -Wl$(comma)--build-id,))
850 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
851 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
852
853 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
854 LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
855 endif
856
857 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
858 LDFLAGS_vmlinux += $(call ld-option, -X,)
859 endif
860
861 # Default kernel image to build when no specific target is given.
862 # KBUILD_IMAGE may be overruled on the command line or
863 # set in the environment
864 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
865 # this default value
866 export KBUILD_IMAGE ?= vmlinux
867
868 #
869 # INSTALL_PATH specifies where to place the updated kernel and system map
870 # images. Default is /boot, but you can set it to other values
871 export INSTALL_PATH ?= /boot
872
873 #
874 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
875 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
876 # an argument if needed. Otherwise it defaults to the kernel install path
877 #
878 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
879
880 #
881 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
882 # relocations required by build roots. This is not defined in the
883 # makefile but the argument can be passed to make if needed.
884 #
885
886 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
887 export MODLIB
888
889 #
890 # INSTALL_MOD_STRIP, if defined, will cause modules to be
891 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
892 # the default option --strip-debug will be used. Otherwise,
893 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
894
895 ifdef INSTALL_MOD_STRIP
896 ifeq ($(INSTALL_MOD_STRIP),1)
897 mod_strip_cmd = $(STRIP) --strip-debug
898 else
899 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
900 endif # INSTALL_MOD_STRIP=1
901 else
902 mod_strip_cmd = true
903 endif # INSTALL_MOD_STRIP
904 export mod_strip_cmd
905
906 # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
907 # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
908 # or CONFIG_MODULE_COMPRESS_XZ.
909
910 mod_compress_cmd = true
911 ifdef CONFIG_MODULE_COMPRESS
912 ifdef CONFIG_MODULE_COMPRESS_GZIP
913 mod_compress_cmd = gzip -n -f
914 endif # CONFIG_MODULE_COMPRESS_GZIP
915 ifdef CONFIG_MODULE_COMPRESS_XZ
916 mod_compress_cmd = xz -f
917 endif # CONFIG_MODULE_COMPRESS_XZ
918 endif # CONFIG_MODULE_COMPRESS
919 export mod_compress_cmd
920
921 # Select initial ramdisk compression format, default is gzip(1).
922 # This shall be used by the dracut(8) tool while creating an initramfs image.
923 #
924 INITRD_COMPRESS-y := gzip
925 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
926 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
927 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
928 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
929 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
930 # do not export INITRD_COMPRESS, since we didn't actually
931 # choose a sane default compression above.
932 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
933
934 ifdef CONFIG_MODULE_SIG_ALL
935 $(eval $(call config_filename,MODULE_SIG_KEY))
936
937 mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
938 else
939 mod_sign_cmd = true
940 endif
941 export mod_sign_cmd
942
943
944 ifeq ($(KBUILD_EXTMOD),)
945 core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
946
947 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
948 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
949 $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
950
951 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
952 $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
953
954 init-y := $(patsubst %/, %/built-in.o, $(init-y))
955 core-y := $(patsubst %/, %/built-in.o, $(core-y))
956 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
957 net-y := $(patsubst %/, %/built-in.o, $(net-y))
958 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
959 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
960 libs-y := $(libs-y1) $(libs-y2)
961 virt-y := $(patsubst %/, %/built-in.o, $(virt-y))
962
963 # Externally visible symbols (used by link-vmlinux.sh)
964 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
965 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
966 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
967 export LDFLAGS_vmlinux
968 # used by scripts/pacmage/Makefile
969 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
970
971 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
972
973 # Include targets which we want to execute sequentially if the rest of the
974 # kernel build went well. If CONFIG_TRIM_UNUSED_KSYMS is set, this might be
975 # evaluated more than once.
976 PHONY += vmlinux_prereq
977 vmlinux_prereq: $(vmlinux-deps) FORCE
978 ifdef CONFIG_HEADERS_CHECK
979 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
980 endif
981 ifdef CONFIG_GDB_SCRIPTS
982 $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
983 endif
984 ifdef CONFIG_TRIM_UNUSED_KSYMS
985 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
986 "$(MAKE) -f $(srctree)/Makefile vmlinux"
987 endif
988
989 # standalone target for easier testing
990 include/generated/autoksyms.h: FORCE
991 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh true
992
993 ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
994
995 # Final link of vmlinux with optional arch pass after final link
996 cmd_link-vmlinux = \
997 $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
998 $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
999
1000 vmlinux: scripts/link-vmlinux.sh vmlinux_prereq $(vmlinux-deps) FORCE
1001 +$(call if_changed,link-vmlinux)
1002
1003 # Build samples along the rest of the kernel
1004 ifdef CONFIG_SAMPLES
1005 vmlinux-dirs += samples
1006 endif
1007
1008 # The actual objects are generated when descending,
1009 # make sure no implicit rule kicks in
1010 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1011
1012 # Handle descending into subdirectories listed in $(vmlinux-dirs)
1013 # Preset locale variables to speed up the build process. Limit locale
1014 # tweaks to this spot to avoid wrong language settings when running
1015 # make menuconfig etc.
1016 # Error messages still appears in the original language
1017
1018 PHONY += $(vmlinux-dirs)
1019 $(vmlinux-dirs): prepare scripts
1020 $(Q)$(MAKE) $(build)=$@
1021
1022 define filechk_kernel.release
1023 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1024 endef
1025
1026 # Store (new) KERNELRELEASE string in include/config/kernel.release
1027 include/config/kernel.release: include/config/auto.conf FORCE
1028 $(call filechk,kernel.release)
1029
1030
1031 # Things we need to do before we recursively start building the kernel
1032 # or the modules are listed in "prepare".
1033 # A multi level approach is used. prepareN is processed before prepareN-1.
1034 # archprepare is used in arch Makefiles and when processed asm symlink,
1035 # version.h and scripts_basic is processed / created.
1036
1037 # Listed in dependency order
1038 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1039
1040 # prepare3 is used to check if we are building in a separate output directory,
1041 # and if so do:
1042 # 1) Check that make has not been executed in the kernel src $(srctree)
1043 prepare3: include/config/kernel.release
1044 ifneq ($(KBUILD_SRC),)
1045 @$(kecho) ' Using $(srctree) as source for kernel'
1046 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1047 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
1048 echo >&2 " in the '$(srctree)' directory.";\
1049 /bin/false; \
1050 fi;
1051 endif
1052
1053 # prepare2 creates a makefile if using a separate output directory.
1054 # From this point forward, .config has been reprocessed, so any rules
1055 # that need to depend on updated CONFIG_* values can be checked here.
1056 prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
1057
1058 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1059 include/config/auto.conf
1060 $(cmd_crmodverdir)
1061
1062 archprepare: archheaders archscripts prepare1 scripts_basic
1063
1064 prepare0: archprepare gcc-plugins
1065 $(Q)$(MAKE) $(build)=.
1066
1067 # All the preparing..
1068 prepare: prepare0 prepare-objtool
1069
1070 ifdef CONFIG_STACK_VALIDATION
1071 has_libelf := $(call try-run,\
1072 echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
1073 ifeq ($(has_libelf),1)
1074 objtool_target := tools/objtool FORCE
1075 else
1076 $(warning "Cannot use CONFIG_STACK_VALIDATION, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
1077 SKIP_STACK_VALIDATION := 1
1078 export SKIP_STACK_VALIDATION
1079 endif
1080 endif
1081
1082 PHONY += prepare-objtool
1083 prepare-objtool: $(objtool_target)
1084
1085 # Check for CONFIG flags that require compiler support. Abort the build
1086 # after .config has been processed, but before the kernel build starts.
1087 #
1088 # For security-sensitive CONFIG options, we don't want to fallback and/or
1089 # silently change which compiler flags will be used, since that leads to
1090 # producing kernels with different security feature characteristics
1091 # depending on the compiler used. (For example, "But I selected
1092 # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
1093 PHONY += prepare-compiler-check
1094 prepare-compiler-check: FORCE
1095 # Make sure compiler supports requested stack protector flag.
1096 ifdef stackp-name
1097 ifeq ($(call cc-option, $(stackp-flag)),)
1098 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1099 $(stackp-flag) not supported by compiler >&2 && exit 1
1100 endif
1101 endif
1102 # Make sure compiler does not have buggy stack-protector support.
1103 ifdef stackp-check
1104 ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
1105 @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
1106 $(stackp-flag) available but compiler is broken >&2 && exit 1
1107 endif
1108 endif
1109 @:
1110
1111 # Generate some files
1112 # ---------------------------------------------------------------------------
1113
1114 # KERNELRELEASE can change from a few different places, meaning version.h
1115 # needs to be updated, so this check is forced on all builds
1116
1117 uts_len := 64
1118 define filechk_utsrelease.h
1119 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1120 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1121 exit 1; \
1122 fi; \
1123 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1124 endef
1125
1126 define filechk_version.h
1127 (echo \#define LINUX_VERSION_CODE $(shell \
1128 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1129 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1130 endef
1131
1132 $(version_h): $(srctree)/Makefile FORCE
1133 $(call filechk,version.h)
1134 $(Q)rm -f $(old_version_h)
1135
1136 include/generated/utsrelease.h: include/config/kernel.release FORCE
1137 $(call filechk,utsrelease.h)
1138
1139 PHONY += headerdep
1140 headerdep:
1141 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1142 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1143
1144 # ---------------------------------------------------------------------------
1145 # Firmware install
1146 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1147 export INSTALL_FW_PATH
1148
1149 PHONY += firmware_install
1150 firmware_install:
1151 @mkdir -p $(objtree)/firmware
1152 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1153
1154 # ---------------------------------------------------------------------------
1155 # Kernel headers
1156
1157 #Default location for installed headers
1158 export INSTALL_HDR_PATH = $(objtree)/usr
1159
1160 # If we do an all arch process set dst to asm-$(hdr-arch)
1161 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1162
1163 PHONY += archheaders
1164 archheaders:
1165
1166 PHONY += archscripts
1167 archscripts:
1168
1169 PHONY += __headers
1170 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts
1171 $(Q)$(MAKE) $(build)=scripts build_unifdef
1172
1173 PHONY += headers_install_all
1174 headers_install_all:
1175 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1176
1177 PHONY += headers_install
1178 headers_install: __headers
1179 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1180 $(error Headers not exportable for the $(SRCARCH) architecture))
1181 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1182 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1183 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders=
1184
1185 PHONY += headers_check_all
1186 headers_check_all: headers_install_all
1187 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1188
1189 PHONY += headers_check
1190 headers_check: headers_install
1191 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1192 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1193 $(Q)$(MAKE) $(hdr-inst)=ubuntu/include dst=include oldheaders= HDRCHECK=1
1194
1195 # ---------------------------------------------------------------------------
1196 # Kernel selftest
1197
1198 PHONY += kselftest
1199 kselftest:
1200 $(Q)$(MAKE) -C tools/testing/selftests run_tests
1201
1202 kselftest-clean:
1203 $(Q)$(MAKE) -C tools/testing/selftests clean
1204
1205 PHONY += kselftest-merge
1206 kselftest-merge:
1207 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1208 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1209 -m $(objtree)/.config \
1210 $(srctree)/tools/testing/selftests/*/config
1211 +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1212
1213 # ---------------------------------------------------------------------------
1214 # Modules
1215
1216 ifdef CONFIG_MODULES
1217
1218 # By default, build modules as well
1219
1220 all: modules
1221
1222 # Build modules
1223 #
1224 # A module can be listed more than once in obj-m resulting in
1225 # duplicate lines in modules.order files. Those are removed
1226 # using awk while concatenating to the final file.
1227
1228 PHONY += modules
1229 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1230 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1231 @$(kecho) ' Building modules, stage 2.';
1232 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1233 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1234
1235 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1236 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1237
1238 %/modules.builtin: include/config/auto.conf
1239 $(Q)$(MAKE) $(modbuiltin)=$*
1240
1241
1242 # Target to prepare building external modules
1243 PHONY += modules_prepare
1244 modules_prepare: prepare scripts
1245
1246 # Target to install modules
1247 PHONY += modules_install
1248 modules_install: _modinst_ _modinst_post
1249
1250 PHONY += _modinst_
1251 _modinst_:
1252 @rm -rf $(MODLIB)/kernel
1253 @rm -f $(MODLIB)/source
1254 @mkdir -p $(MODLIB)/kernel
1255 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1256 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1257 rm -f $(MODLIB)/build ; \
1258 ln -s $(CURDIR) $(MODLIB)/build ; \
1259 fi
1260 @cp -f $(objtree)/modules.order $(MODLIB)/
1261 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1262 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1263
1264 # This depmod is only for convenience to give the initial
1265 # boot a modules.dep even before / is mounted read-write. However the
1266 # boot script depmod is the master version.
1267 PHONY += _modinst_post
1268 _modinst_post: _modinst_
1269 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1270 $(call cmd,depmod)
1271
1272 ifeq ($(CONFIG_MODULE_SIG), y)
1273 PHONY += modules_sign
1274 modules_sign:
1275 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1276 endif
1277
1278 else # CONFIG_MODULES
1279
1280 # Modules not configured
1281 # ---------------------------------------------------------------------------
1282
1283 PHONY += modules modules_install
1284 modules modules_install:
1285 @echo >&2
1286 @echo >&2 "The present kernel configuration has modules disabled."
1287 @echo >&2 "Type 'make config' and enable loadable module support."
1288 @echo >&2 "Then build a kernel with module support enabled."
1289 @echo >&2
1290 @exit 1
1291
1292 endif # CONFIG_MODULES
1293
1294 ###
1295 # Cleaning is done on three levels.
1296 # make clean Delete most generated files
1297 # Leave enough to build external modules
1298 # make mrproper Delete the current configuration, and all generated files
1299 # make distclean Remove editor backup files, patch leftover files and the like
1300
1301 # Directories & files removed with 'make clean'
1302 CLEAN_DIRS += $(MODVERDIR)
1303
1304 # Directories & files removed with 'make mrproper'
1305 MRPROPER_DIRS += include/config usr/include include/generated \
1306 arch/*/include/generated .tmp_objdiff
1307 MRPROPER_FILES += .config .config.old .version .old_version \
1308 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1309 signing_key.pem signing_key.priv signing_key.x509 \
1310 x509.genkey extra_certificates signing_key.x509.keyid \
1311 signing_key.x509.signer vmlinux-gdb.py
1312
1313 # clean - Delete most, but leave enough to build external modules
1314 #
1315 clean: rm-dirs := $(CLEAN_DIRS)
1316 clean: rm-files := $(CLEAN_FILES)
1317 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1318
1319 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1320 $(clean-dirs):
1321 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1322
1323 vmlinuxclean:
1324 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1325 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1326
1327 clean: archclean vmlinuxclean
1328
1329 # mrproper - Delete all generated files, including .config
1330 #
1331 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1332 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1333 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1334
1335 PHONY += $(mrproper-dirs) mrproper archmrproper
1336 $(mrproper-dirs):
1337 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1338
1339 mrproper: clean archmrproper $(mrproper-dirs)
1340 $(call cmd,rmdirs)
1341 $(call cmd,rmfiles)
1342
1343 # distclean
1344 #
1345 PHONY += distclean
1346
1347 distclean: mrproper
1348 @find $(srctree) $(RCS_FIND_IGNORE) \
1349 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1350 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1351 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1352 -type f -print | xargs rm -f
1353
1354
1355 # Packaging of the kernel to various formats
1356 # ---------------------------------------------------------------------------
1357 # rpm target kept for backward compatibility
1358 package-dir := scripts/package
1359
1360 %src-pkg: FORCE
1361 $(Q)$(MAKE) $(build)=$(package-dir) $@
1362 %pkg: include/config/kernel.release FORCE
1363 $(Q)$(MAKE) $(build)=$(package-dir) $@
1364 rpm: include/config/kernel.release FORCE
1365 $(Q)$(MAKE) $(build)=$(package-dir) $@
1366
1367
1368 # Brief documentation of the typical targets used
1369 # ---------------------------------------------------------------------------
1370
1371 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1372 boards := $(sort $(notdir $(boards)))
1373 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1374 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1375
1376 PHONY += help
1377 help:
1378 @echo 'Cleaning targets:'
1379 @echo ' clean - Remove most generated files but keep the config and'
1380 @echo ' enough build support to build external modules'
1381 @echo ' mrproper - Remove all generated files + config + various backup files'
1382 @echo ' distclean - mrproper + remove editor backup and patch files'
1383 @echo ''
1384 @echo 'Configuration targets:'
1385 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1386 @echo ''
1387 @echo 'Other generic targets:'
1388 @echo ' all - Build all targets marked with [*]'
1389 @echo '* vmlinux - Build the bare kernel'
1390 @echo '* modules - Build all modules'
1391 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1392 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1393 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1394 @echo ' dir/ - Build all files in dir and below'
1395 @echo ' dir/file.[ois] - Build specified target only'
1396 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1397 @echo ' (requires a recent binutils and recent build (System.map))'
1398 @echo ' dir/file.ko - Build module including final link'
1399 @echo ' modules_prepare - Set up for building external modules'
1400 @echo ' tags/TAGS - Generate tags file for editors'
1401 @echo ' cscope - Generate cscope index'
1402 @echo ' gtags - Generate GNU GLOBAL index'
1403 @echo ' kernelrelease - Output the release version string (use with make -s)'
1404 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1405 @echo ' image_name - Output the image name (use with make -s)'
1406 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1407 echo ' (default: $(INSTALL_HDR_PATH))'; \
1408 echo ''
1409 @echo 'Static analysers'
1410 @echo ' checkstack - Generate a list of stack hogs'
1411 @echo ' namespacecheck - Name space analysis on compiled kernel'
1412 @echo ' versioncheck - Sanity check on version.h usage'
1413 @echo ' includecheck - Check for duplicate included header files'
1414 @echo ' export_report - List the usages of all exported symbols'
1415 @echo ' headers_check - Sanity check on exported headers'
1416 @echo ' headerdep - Detect inclusion cycles in headers'
1417 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1418 @echo ''
1419 @echo 'Kernel selftest'
1420 @echo ' kselftest - Build and run kernel selftest (run as root)'
1421 @echo ' Build, install, and boot kernel before'
1422 @echo ' running kselftest on it'
1423 @echo ' kselftest-clean - Remove all generated kselftest files'
1424 @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existed'
1425 @echo ' .config.'
1426 @echo ''
1427 @echo 'Kernel packaging:'
1428 @$(MAKE) $(build)=$(package-dir) help
1429 @echo ''
1430 @echo 'Documentation targets:'
1431 @$(MAKE) -f $(srctree)/Documentation/Makefile.sphinx dochelp
1432 @echo ''
1433 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1434 @echo ''
1435 @echo 'Architecture specific targets ($(SRCARCH)):'
1436 @$(if $(archhelp),$(archhelp),\
1437 echo ' No architecture specific help defined for $(SRCARCH)')
1438 @echo ''
1439 @$(if $(boards), \
1440 $(foreach b, $(boards), \
1441 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1442 echo '')
1443 @$(if $(board-dirs), \
1444 $(foreach b, $(board-dirs), \
1445 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1446 printf " %-16s - Show all of the above\\n" help-boards; \
1447 echo '')
1448
1449 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1450 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1451 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1452 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1453 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1454 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1455 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1456 @echo ' 1: warnings which may be relevant and do not occur too often'
1457 @echo ' 2: warnings which occur quite often but may still be relevant'
1458 @echo ' 3: more obscure warnings, can most likely be ignored'
1459 @echo ' Multiple levels can be combined with W=12 or W=123'
1460 @echo ''
1461 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1462 @echo 'For further info see the ./README file'
1463
1464
1465 help-board-dirs := $(addprefix help-,$(board-dirs))
1466
1467 help-boards: $(help-board-dirs)
1468
1469 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1470
1471 $(help-board-dirs): help-%:
1472 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1473 @$(if $(boards-per-dir), \
1474 $(foreach b, $(boards-per-dir), \
1475 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1476 echo '')
1477
1478
1479 # Documentation targets
1480 # ---------------------------------------------------------------------------
1481 DOC_TARGETS := xmldocs sgmldocs psdocs latexdocs pdfdocs htmldocs mandocs installmandocs epubdocs cleandocs
1482 PHONY += $(DOC_TARGETS)
1483 $(DOC_TARGETS): scripts_basic FORCE
1484 $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1485 $(Q)$(MAKE) $(build)=Documentation -f $(srctree)/Documentation/Makefile.sphinx $@
1486 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1487
1488 else # KBUILD_EXTMOD
1489
1490 ###
1491 # External module support.
1492 # When building external modules the kernel used as basis is considered
1493 # read-only, and no consistency checks are made and the make
1494 # system is not used on the basis kernel. If updates are required
1495 # in the basis kernel ordinary make commands (without M=...) must
1496 # be used.
1497 #
1498 # The following are the only valid targets when building external
1499 # modules.
1500 # make M=dir clean Delete all automatically generated files
1501 # make M=dir modules Make all modules in specified dir
1502 # make M=dir Same as 'make M=dir modules'
1503 # make M=dir modules_install
1504 # Install the modules built in the module directory
1505 # Assumes install directory is already created
1506
1507 # We are always building modules
1508 KBUILD_MODULES := 1
1509 PHONY += crmodverdir
1510 crmodverdir:
1511 $(cmd_crmodverdir)
1512
1513 PHONY += $(objtree)/Module.symvers
1514 $(objtree)/Module.symvers:
1515 @test -e $(objtree)/Module.symvers || ( \
1516 echo; \
1517 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1518 echo " is missing; modules will have no dependencies and modversions."; \
1519 echo )
1520
1521 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1522 PHONY += $(module-dirs) modules
1523 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1524 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1525
1526 modules: $(module-dirs)
1527 @$(kecho) ' Building modules, stage 2.';
1528 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1529
1530 PHONY += modules_install
1531 modules_install: _emodinst_ _emodinst_post
1532
1533 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1534 PHONY += _emodinst_
1535 _emodinst_:
1536 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1537 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1538
1539 PHONY += _emodinst_post
1540 _emodinst_post: _emodinst_
1541 $(call cmd,depmod)
1542
1543 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1544
1545 PHONY += $(clean-dirs) clean
1546 $(clean-dirs):
1547 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1548
1549 clean: rm-dirs := $(MODVERDIR)
1550 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1551
1552 PHONY += help
1553 help:
1554 @echo ' Building external modules.'
1555 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1556 @echo ''
1557 @echo ' modules - default target, build the module(s)'
1558 @echo ' modules_install - install the module'
1559 @echo ' clean - remove generated files in module directory only'
1560 @echo ''
1561
1562 # Dummies...
1563 PHONY += prepare scripts
1564 prepare: ;
1565 scripts: ;
1566 endif # KBUILD_EXTMOD
1567
1568 clean: $(clean-dirs)
1569 $(call cmd,rmdirs)
1570 $(call cmd,rmfiles)
1571 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1572 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1573 -o -name '*.ko.*' \
1574 -o -name '*.dwo' \
1575 -o -name '*.su' \
1576 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1577 -o -name '*.symtypes' -o -name 'modules.order' \
1578 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1579 -o -name '*.c.[012]*.*' \
1580 -o -name '*.gcno' \) -type f -print | xargs rm -f
1581
1582 # Generate tags for editors
1583 # ---------------------------------------------------------------------------
1584 quiet_cmd_tags = GEN $@
1585 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1586
1587 tags TAGS cscope gtags: FORCE
1588 $(call cmd,tags)
1589
1590 # Scripts to check various things for consistency
1591 # ---------------------------------------------------------------------------
1592
1593 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1594
1595 includecheck:
1596 find $(srctree)/* $(RCS_FIND_IGNORE) \
1597 -name '*.[hcS]' -type f -print | sort \
1598 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1599
1600 versioncheck:
1601 find $(srctree)/* $(RCS_FIND_IGNORE) \
1602 -name '*.[hcS]' -type f -print | sort \
1603 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1604
1605 coccicheck:
1606 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1607
1608 namespacecheck:
1609 $(PERL) $(srctree)/scripts/namespace.pl
1610
1611 export_report:
1612 $(PERL) $(srctree)/scripts/export_report.pl
1613
1614 endif #ifeq ($(config-targets),1)
1615 endif #ifeq ($(mixed-targets),1)
1616
1617 PHONY += checkstack kernelrelease kernelversion image_name
1618
1619 # UML needs a little special treatment here. It wants to use the host
1620 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1621 # else wants $(ARCH), including people doing cross-builds, which means
1622 # that $(SUBARCH) doesn't work here.
1623 ifeq ($(ARCH), um)
1624 CHECKSTACK_ARCH := $(SUBARCH)
1625 else
1626 CHECKSTACK_ARCH := $(ARCH)
1627 endif
1628 checkstack:
1629 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1630 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1631
1632 kernelrelease:
1633 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1634
1635 kernelversion:
1636 @echo $(KERNELVERSION)
1637
1638 image_name:
1639 @echo $(KBUILD_IMAGE)
1640
1641 # Clear a bunch of variables before executing the submake
1642 tools/: FORCE
1643 $(Q)mkdir -p $(objtree)/tools
1644 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1645
1646 tools/%: FORCE
1647 $(Q)mkdir -p $(objtree)/tools
1648 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1649
1650 # Single targets
1651 # ---------------------------------------------------------------------------
1652 # Single targets are compatible with:
1653 # - build with mixed source and output
1654 # - build with separate output dir 'make O=...'
1655 # - external modules
1656 #
1657 # target-dir => where to store outputfile
1658 # build-dir => directory in kernel source tree to use
1659
1660 ifeq ($(KBUILD_EXTMOD),)
1661 build-dir = $(patsubst %/,%,$(dir $@))
1662 target-dir = $(dir $@)
1663 else
1664 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1665 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1666 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1667 endif
1668
1669 %.s: %.c prepare scripts FORCE
1670 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1671 %.i: %.c prepare scripts FORCE
1672 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1673 %.o: %.c prepare scripts FORCE
1674 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1675 %.lst: %.c prepare scripts FORCE
1676 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1677 %.s: %.S prepare scripts FORCE
1678 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1679 %.o: %.S prepare scripts FORCE
1680 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1681 %.symtypes: %.c prepare scripts FORCE
1682 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1683
1684 # Modules
1685 /: prepare scripts FORCE
1686 $(cmd_crmodverdir)
1687 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1688 $(build)=$(build-dir)
1689 # Make sure the latest headers are built for Documentation
1690 Documentation/ samples/: headers_install
1691 %/: prepare scripts FORCE
1692 $(cmd_crmodverdir)
1693 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1694 $(build)=$(build-dir)
1695 %.ko: prepare scripts FORCE
1696 $(cmd_crmodverdir)
1697 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1698 $(build)=$(build-dir) $(@:.ko=.o)
1699 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1700
1701 # FIXME Should go into a make.lib or something
1702 # ===========================================================================
1703
1704 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1705 cmd_rmdirs = rm -rf $(rm-dirs)
1706
1707 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1708 cmd_rmfiles = rm -f $(rm-files)
1709
1710 # Run depmod only if we have System.map and depmod is executable
1711 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1712 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1713 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1714
1715 # Create temporary dir for module support files
1716 # clean it up only when building all modules
1717 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1718 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1719
1720 # read all saved command lines
1721
1722 targets := $(wildcard $(sort $(targets)))
1723 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1724
1725 ifneq ($(cmd_files),)
1726 $(cmd_files): ; # Do not try to update included dependency files
1727 include $(cmd_files)
1728 endif
1729
1730 endif # skip-makefile
1731
1732 PHONY += FORCE
1733 FORCE:
1734
1735 # Declare the contents of the .PHONY variable as phony. We keep that
1736 # information in a variable so we can use it in if_changed and friends.
1737 .PHONY: $(PHONY)