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1 VERSION = 3
2 PATCHLEVEL = 14
3 SUBLEVEL = 0
4 EXTRAVERSION =
5 NAME = Shuffling Zombie Juror
6
7 # *DOCUMENTATION*
8 # To see a list of typical targets execute "make help"
9 # More info can be located in ./README
10 # Comments in this file are targeted only to the developer, do not
11 # expect to learn how to build the kernel reading this file.
12
13 # Do not:
14 # o use make's built-in rules and variables
15 # (this increases performance and avoids hard-to-debug behaviour);
16 # o print "Entering directory ...";
17 MAKEFLAGS += -rR --no-print-directory
18
19 # Avoid funny character set dependencies
20 unexport LC_ALL
21 LC_COLLATE=C
22 LC_NUMERIC=C
23 export LC_COLLATE LC_NUMERIC
24
25 # Avoid interference with shell env settings
26 unexport GREP_OPTIONS
27
28 # We are using a recursive build, so we need to do a little thinking
29 # to get the ordering right.
30 #
31 # Most importantly: sub-Makefiles should only ever modify files in
32 # their own directory. If in some directory we have a dependency on
33 # a file in another dir (which doesn't happen often, but it's often
34 # unavoidable when linking the built-in.o targets which finally
35 # turn into vmlinux), we will call a sub make in that other dir, and
36 # after that we are sure that everything which is in that other dir
37 # is now up to date.
38 #
39 # The only cases where we need to modify files which have global
40 # effects are thus separated out and done before the recursive
41 # descending is started. They are now explicitly listed as the
42 # prepare rule.
43
44 # To put more focus on warnings, be less verbose as default
45 # Use 'make V=1' to see the full commands
46
47 ifeq ("$(origin V)", "command line")
48 KBUILD_VERBOSE = $(V)
49 endif
50 ifndef KBUILD_VERBOSE
51 KBUILD_VERBOSE = 0
52 endif
53
54 # Call a source code checker (by default, "sparse") as part of the
55 # C compilation.
56 #
57 # Use 'make C=1' to enable checking of only re-compiled files.
58 # Use 'make C=2' to enable checking of *all* source files, regardless
59 # of whether they are re-compiled or not.
60 #
61 # See the file "Documentation/sparse.txt" for more details, including
62 # where to get the "sparse" utility.
63
64 ifeq ("$(origin C)", "command line")
65 KBUILD_CHECKSRC = $(C)
66 endif
67 ifndef KBUILD_CHECKSRC
68 KBUILD_CHECKSRC = 0
69 endif
70
71 # Use make M=dir to specify directory of external module to build
72 # Old syntax make ... SUBDIRS=$PWD is still supported
73 # Setting the environment variable KBUILD_EXTMOD take precedence
74 ifdef SUBDIRS
75 KBUILD_EXTMOD ?= $(SUBDIRS)
76 endif
77
78 ifeq ("$(origin M)", "command line")
79 KBUILD_EXTMOD := $(M)
80 endif
81
82 # kbuild supports saving output files in a separate directory.
83 # To locate output files in a separate directory two syntaxes are supported.
84 # In both cases the working directory must be the root of the kernel src.
85 # 1) O=
86 # Use "make O=dir/to/store/output/files/"
87 #
88 # 2) Set KBUILD_OUTPUT
89 # Set the environment variable KBUILD_OUTPUT to point to the directory
90 # where the output files shall be placed.
91 # export KBUILD_OUTPUT=dir/to/store/output/files/
92 # make
93 #
94 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
95 # variable.
96
97
98 # KBUILD_SRC is set on invocation of make in OBJ directory
99 # KBUILD_SRC is not intended to be used by the regular user (for now)
100 ifeq ($(KBUILD_SRC),)
101
102 # OK, Make called in directory where kernel src resides
103 # Do we want to locate output files in a separate directory?
104 ifeq ("$(origin O)", "command line")
105 KBUILD_OUTPUT := $(O)
106 endif
107
108 ifeq ("$(origin W)", "command line")
109 export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
110 endif
111
112 # That's our default target when none is given on the command line
113 PHONY := _all
114 _all:
115
116 # Cancel implicit rules on top Makefile
117 $(CURDIR)/Makefile Makefile: ;
118
119 ifneq ($(KBUILD_OUTPUT),)
120 # Invoke a second make in the output directory, passing relevant variables
121 # check that the output directory actually exists
122 saved-output := $(KBUILD_OUTPUT)
123 KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
124 && /bin/pwd)
125 $(if $(KBUILD_OUTPUT),, \
126 $(error failed to create output directory "$(saved-output)"))
127
128 PHONY += $(MAKECMDGOALS) sub-make
129
130 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
131 @:
132
133 sub-make: FORCE
134 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
135 KBUILD_SRC=$(CURDIR) \
136 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
137 $(filter-out _all sub-make,$(MAKECMDGOALS))
138
139 # Leave processing to above invocation of make
140 skip-makefile := 1
141 endif # ifneq ($(KBUILD_OUTPUT),)
142 endif # ifeq ($(KBUILD_SRC),)
143
144 # We process the rest of the Makefile if this is the final invocation of make
145 ifeq ($(skip-makefile),)
146
147 # If building an external module we do not care about the all: rule
148 # but instead _all depend on modules
149 PHONY += all
150 ifeq ($(KBUILD_EXTMOD),)
151 _all: all
152 else
153 _all: modules
154 endif
155
156 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
157 objtree := $(CURDIR)
158 src := $(srctree)
159 obj := $(objtree)
160
161 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
162
163 export srctree objtree VPATH
164
165
166 # SUBARCH tells the usermode build what the underlying arch is. That is set
167 # first, and if a usermode build is happening, the "ARCH=um" on the command
168 # line overrides the setting of ARCH below. If a native build is happening,
169 # then ARCH is assigned, getting whatever value it gets normally, and
170 # SUBARCH is subsequently ignored.
171
172 SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
173 -e s/sun4u/sparc64/ \
174 -e s/arm.*/arm/ -e s/sa110/arm/ \
175 -e s/s390x/s390/ -e s/parisc64/parisc/ \
176 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
177 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
178
179 # Cross compiling and selecting different set of gcc/bin-utils
180 # ---------------------------------------------------------------------------
181 #
182 # When performing cross compilation for other architectures ARCH shall be set
183 # to the target architecture. (See arch/* for the possibilities).
184 # ARCH can be set during invocation of make:
185 # make ARCH=ia64
186 # Another way is to have ARCH set in the environment.
187 # The default ARCH is the host where make is executed.
188
189 # CROSS_COMPILE specify the prefix used for all executables used
190 # during compilation. Only gcc and related bin-utils executables
191 # are prefixed with $(CROSS_COMPILE).
192 # CROSS_COMPILE can be set on the command line
193 # make CROSS_COMPILE=ia64-linux-
194 # Alternatively CROSS_COMPILE can be set in the environment.
195 # A third alternative is to store a setting in .config so that plain
196 # "make" in the configured kernel build directory always uses that.
197 # Default value for CROSS_COMPILE is not to prefix executables
198 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
199 ARCH ?= $(SUBARCH)
200 CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
201
202 # Architecture as present in compile.h
203 UTS_MACHINE := $(ARCH)
204 SRCARCH := $(ARCH)
205
206 # Additional ARCH settings for x86
207 ifeq ($(ARCH),i386)
208 SRCARCH := x86
209 endif
210 ifeq ($(ARCH),x86_64)
211 SRCARCH := x86
212 endif
213
214 # Additional ARCH settings for sparc
215 ifeq ($(ARCH),sparc32)
216 SRCARCH := sparc
217 endif
218 ifeq ($(ARCH),sparc64)
219 SRCARCH := sparc
220 endif
221
222 # Additional ARCH settings for sh
223 ifeq ($(ARCH),sh64)
224 SRCARCH := sh
225 endif
226
227 # Additional ARCH settings for tile
228 ifeq ($(ARCH),tilepro)
229 SRCARCH := tile
230 endif
231 ifeq ($(ARCH),tilegx)
232 SRCARCH := tile
233 endif
234
235 # Where to locate arch specific headers
236 hdr-arch := $(SRCARCH)
237
238 KCONFIG_CONFIG ?= .config
239 export KCONFIG_CONFIG
240
241 # SHELL used by kbuild
242 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243 else if [ -x /bin/bash ]; then echo /bin/bash; \
244 else echo sh; fi ; fi)
245
246 HOSTCC = gcc
247 HOSTCXX = g++
248 HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
249 HOSTCXXFLAGS = -O2
250
251 ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
252 HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
253 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
254 endif
255
256 # Decide whether to build built-in, modular, or both.
257 # Normally, just do built-in.
258
259 KBUILD_MODULES :=
260 KBUILD_BUILTIN := 1
261
262 # If we have only "make modules", don't compile built-in objects.
263 # When we're building modules with modversions, we need to consider
264 # the built-in objects during the descend as well, in order to
265 # make sure the checksums are up to date before we record them.
266
267 ifeq ($(MAKECMDGOALS),modules)
268 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
269 endif
270
271 # If we have "make <whatever> modules", compile modules
272 # in addition to whatever we do anyway.
273 # Just "make" or "make all" shall build modules as well
274
275 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
276 KBUILD_MODULES := 1
277 endif
278
279 ifeq ($(MAKECMDGOALS),)
280 KBUILD_MODULES := 1
281 endif
282
283 export KBUILD_MODULES KBUILD_BUILTIN
284 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
285
286 # Beautify output
287 # ---------------------------------------------------------------------------
288 #
289 # Normally, we echo the whole command before executing it. By making
290 # that echo $($(quiet)$(cmd)), we now have the possibility to set
291 # $(quiet) to choose other forms of output instead, e.g.
292 #
293 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
294 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
295 #
296 # If $(quiet) is empty, the whole command will be printed.
297 # If it is set to "quiet_", only the short version will be printed.
298 # If it is set to "silent_", nothing will be printed at all, since
299 # the variable $(silent_cmd_cc_o_c) doesn't exist.
300 #
301 # A simple variant is to prefix commands with $(Q) - that's useful
302 # for commands that shall be hidden in non-verbose mode.
303 #
304 # $(Q)ln $@ :<
305 #
306 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
307 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
308
309 ifeq ($(KBUILD_VERBOSE),1)
310 quiet =
311 Q =
312 else
313 quiet=quiet_
314 Q = @
315 endif
316
317 # If the user is running make -s (silent mode), suppress echoing of
318 # commands
319
320 ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
321 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
322 quiet=silent_
323 endif
324 else # make-3.8x
325 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
326 quiet=silent_
327 endif
328 endif
329
330 export quiet Q KBUILD_VERBOSE
331
332 ifneq ($(CC),)
333 ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
334 COMPILER := clang
335 else
336 COMPILER := gcc
337 endif
338 export COMPILER
339 endif
340
341 # Look for make include files relative to root of kernel src
342 MAKEFLAGS += --include-dir=$(srctree)
343
344 # We need some generic definitions (do not try to remake the file).
345 $(srctree)/scripts/Kbuild.include: ;
346 include $(srctree)/scripts/Kbuild.include
347
348 # Make variables (CC, etc...)
349
350 AS = $(CROSS_COMPILE)as
351 LD = $(CROSS_COMPILE)ld
352 CC = $(CROSS_COMPILE)gcc
353 CPP = $(CC) -E
354 AR = $(CROSS_COMPILE)ar
355 NM = $(CROSS_COMPILE)nm
356 STRIP = $(CROSS_COMPILE)strip
357 OBJCOPY = $(CROSS_COMPILE)objcopy
358 OBJDUMP = $(CROSS_COMPILE)objdump
359 AWK = awk
360 GENKSYMS = scripts/genksyms/genksyms
361 INSTALLKERNEL := installkernel
362 DEPMOD = /sbin/depmod
363 PERL = perl
364 CHECK = sparse
365
366 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367 -Wbitwise -Wno-return-void $(CF)
368 CFLAGS_MODULE =
369 AFLAGS_MODULE =
370 LDFLAGS_MODULE =
371 CFLAGS_KERNEL =
372 AFLAGS_KERNEL =
373 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
374
375
376 # Use USERINCLUDE when you must reference the UAPI directories only.
377 USERINCLUDE := \
378 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
379 -Iarch/$(hdr-arch)/include/generated/uapi \
380 -I$(srctree)/include/uapi \
381 -Iinclude/generated/uapi \
382 -include $(srctree)/include/linux/kconfig.h
383
384 # Use LINUXINCLUDE when you must reference the include/ directory.
385 # Needed to be compatible with the O= option
386 LINUXINCLUDE := \
387 -I$(srctree)/arch/$(hdr-arch)/include \
388 -Iarch/$(hdr-arch)/include/generated \
389 $(if $(KBUILD_SRC), -I$(srctree)/include) \
390 -Iinclude \
391 $(USERINCLUDE)
392
393 KBUILD_CPPFLAGS := -D__KERNEL__
394
395 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
396 -fno-strict-aliasing -fno-common \
397 -Werror-implicit-function-declaration \
398 -Wno-format-security \
399 $(call cc-option,-fno-delete-null-pointer-checks,)
400 KBUILD_AFLAGS_KERNEL :=
401 KBUILD_CFLAGS_KERNEL :=
402 KBUILD_AFLAGS := -D__ASSEMBLY__
403 KBUILD_AFLAGS_MODULE := -DMODULE
404 KBUILD_CFLAGS_MODULE := -DMODULE
405 KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
406
407 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
408 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
409 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
410
411 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
412 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
413 export CPP AR NM STRIP OBJCOPY OBJDUMP
414 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
415 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
416
417 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
418 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
419 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
420 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
421 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
422 export KBUILD_ARFLAGS
423
424 # When compiling out-of-tree modules, put MODVERDIR in the module
425 # tree rather than in the kernel tree. The kernel tree might
426 # even be read-only.
427 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
428
429 # Files to ignore in find ... statements
430
431 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS \
432 -o -name .pc -o -name .hg -o -name .git \) -prune -o
433 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
434 --exclude CVS --exclude .pc --exclude .hg --exclude .git
435
436 # ===========================================================================
437 # Rules shared between *config targets and build targets
438
439 # Basic helpers built in scripts/
440 PHONY += scripts_basic
441 scripts_basic:
442 $(Q)$(MAKE) $(build)=scripts/basic
443 $(Q)rm -f .tmp_quiet_recordmcount
444
445 # To avoid any implicit rule to kick in, define an empty command.
446 scripts/basic/%: scripts_basic ;
447
448 PHONY += outputmakefile
449 # outputmakefile generates a Makefile in the output directory, if using a
450 # separate output directory. This allows convenient use of make in the
451 # output directory.
452 outputmakefile:
453 ifneq ($(KBUILD_SRC),)
454 $(Q)ln -fsn $(srctree) source
455 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
456 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
457 endif
458
459 # Support for using generic headers in asm-generic
460 PHONY += asm-generic
461 asm-generic:
462 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
463 src=asm obj=arch/$(SRCARCH)/include/generated/asm
464 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
465 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
466
467 # To make sure we do not include .config for any of the *config targets
468 # catch them early, and hand them over to scripts/kconfig/Makefile
469 # It is allowed to specify more targets when calling make, including
470 # mixing *config targets and build targets.
471 # For example 'make oldconfig all'.
472 # Detect when mixed targets is specified, and make a second invocation
473 # of make so .config is not included in this case either (for *config).
474
475 version_h := include/generated/uapi/linux/version.h
476
477 no-dot-config-targets := clean mrproper distclean \
478 cscope gtags TAGS tags help %docs check% coccicheck \
479 $(version_h) headers_% archheaders archscripts \
480 kernelversion %src-pkg
481
482 config-targets := 0
483 mixed-targets := 0
484 dot-config := 1
485
486 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
487 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
488 dot-config := 0
489 endif
490 endif
491
492 ifeq ($(KBUILD_EXTMOD),)
493 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
494 config-targets := 1
495 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
496 mixed-targets := 1
497 endif
498 endif
499 endif
500
501 ifeq ($(mixed-targets),1)
502 # ===========================================================================
503 # We're called with mixed targets (*config and build targets).
504 # Handle them one by one.
505
506 %:: FORCE
507 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
508
509 else
510 ifeq ($(config-targets),1)
511 # ===========================================================================
512 # *config targets only - make sure prerequisites are updated, and descend
513 # in scripts/kconfig to make the *config target
514
515 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
516 # KBUILD_DEFCONFIG may point out an alternative default configuration
517 # used for 'make defconfig'
518 include $(srctree)/arch/$(SRCARCH)/Makefile
519 export KBUILD_DEFCONFIG KBUILD_KCONFIG
520
521 config: scripts_basic outputmakefile FORCE
522 $(Q)mkdir -p include/linux include/config
523 $(Q)$(MAKE) $(build)=scripts/kconfig $@
524
525 %config: scripts_basic outputmakefile FORCE
526 $(Q)mkdir -p include/linux include/config
527 $(Q)$(MAKE) $(build)=scripts/kconfig $@
528
529 else
530 # ===========================================================================
531 # Build targets only - this includes vmlinux, arch specific targets, clean
532 # targets and others. In general all targets except *config targets.
533
534 ifeq ($(KBUILD_EXTMOD),)
535 # Additional helpers built in scripts/
536 # Carefully list dependencies so we do not try to build scripts twice
537 # in parallel
538 PHONY += scripts
539 scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
540 asm-generic
541 $(Q)$(MAKE) $(build)=$(@)
542
543 # Objects we will link into vmlinux / subdirs we need to visit
544 init-y := init/
545 drivers-y := drivers/ sound/ firmware/
546 net-y := net/
547 libs-y := lib/
548 core-y := usr/
549 endif # KBUILD_EXTMOD
550
551 ifeq ($(dot-config),1)
552 # Read in config
553 -include include/config/auto.conf
554
555 ifeq ($(KBUILD_EXTMOD),)
556 # Read in dependencies to all Kconfig* files, make sure to run
557 # oldconfig if changes are detected.
558 -include include/config/auto.conf.cmd
559
560 # To avoid any implicit rule to kick in, define an empty command
561 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
562
563 # If .config is newer than include/config/auto.conf, someone tinkered
564 # with it and forgot to run make oldconfig.
565 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
566 # we execute the config step to be sure to catch updated Kconfig files
567 include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
568 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
569 else
570 # external modules needs include/generated/autoconf.h and include/config/auto.conf
571 # but do not care if they are up-to-date. Use auto.conf to trigger the test
572 PHONY += include/config/auto.conf
573
574 include/config/auto.conf:
575 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
576 echo >&2; \
577 echo >&2 " ERROR: Kernel configuration is invalid."; \
578 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
579 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
580 echo >&2 ; \
581 /bin/false)
582
583 endif # KBUILD_EXTMOD
584
585 else
586 # Dummy target needed, because used as prerequisite
587 include/config/auto.conf: ;
588 endif # $(dot-config)
589
590 # The all: target is the default when no target is given on the
591 # command line.
592 # This allow a user to issue only 'make' to build a kernel including modules
593 # Defaults to vmlinux, but the arch makefile usually adds further targets
594 all: vmlinux
595
596 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
597 KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
598 else
599 KBUILD_CFLAGS += -O2
600 endif
601
602 include $(srctree)/arch/$(SRCARCH)/Makefile
603
604 ifdef CONFIG_READABLE_ASM
605 # Disable optimizations that make assembler listings hard to read.
606 # reorder blocks reorders the control in the function
607 # ipa clone creates specialized cloned functions
608 # partial inlining inlines only parts of functions
609 KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
610 $(call cc-option,-fno-ipa-cp-clone,) \
611 $(call cc-option,-fno-partial-inlining)
612 endif
613
614 ifneq ($(CONFIG_FRAME_WARN),0)
615 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
616 endif
617
618 # Handle stack protector mode.
619 ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
620 stackp-flag := -fstack-protector
621 ifeq ($(call cc-option, $(stackp-flag)),)
622 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
623 -fstack-protector not supported by compiler)
624 endif
625 else
626 ifdef CONFIG_CC_STACKPROTECTOR_STRONG
627 stackp-flag := -fstack-protector-strong
628 ifeq ($(call cc-option, $(stackp-flag)),)
629 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
630 -fstack-protector-strong not supported by compiler)
631 endif
632 else
633 # Force off for distro compilers that enable stack protector by default.
634 stackp-flag := $(call cc-option, -fno-stack-protector)
635 endif
636 endif
637 KBUILD_CFLAGS += $(stackp-flag)
638
639 ifeq ($(COMPILER),clang)
640 KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
641 KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
642 KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
643 KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
644 KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
645 # Quiet clang warning: comparison of unsigned expression < 0 is always false
646 KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
647 # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
648 # source of a reference will be _MergedGlobals and not on of the whitelisted names.
649 # See modpost pattern 2
650 KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
651 else
652
653 # This warning generated too much noise in a regular build.
654 # Use make W=1 to enable this warning (see scripts/Makefile.build)
655 KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
656 endif
657
658 ifdef CONFIG_FRAME_POINTER
659 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
660 else
661 # Some targets (ARM with Thumb2, for example), can't be built with frame
662 # pointers. For those, we don't have FUNCTION_TRACER automatically
663 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
664 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
665 # -fomit-frame-pointer with FUNCTION_TRACER.
666 ifndef CONFIG_FUNCTION_TRACER
667 KBUILD_CFLAGS += -fomit-frame-pointer
668 endif
669 endif
670
671 ifdef CONFIG_DEBUG_INFO
672 KBUILD_CFLAGS += -g
673 KBUILD_AFLAGS += -Wa,--gdwarf-2
674 endif
675
676 ifdef CONFIG_DEBUG_INFO_REDUCED
677 KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
678 $(call cc-option,-fno-var-tracking)
679 endif
680
681 ifdef CONFIG_FUNCTION_TRACER
682 ifdef CONFIG_HAVE_FENTRY
683 CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
684 endif
685 KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
686 KBUILD_AFLAGS += $(CC_USING_FENTRY)
687 ifdef CONFIG_DYNAMIC_FTRACE
688 ifdef CONFIG_HAVE_C_RECORDMCOUNT
689 BUILD_C_RECORDMCOUNT := y
690 export BUILD_C_RECORDMCOUNT
691 endif
692 endif
693 endif
694
695 # We trigger additional mismatches with less inlining
696 ifdef CONFIG_DEBUG_SECTION_MISMATCH
697 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
698 endif
699
700 # arch Makefile may override CC so keep this after arch Makefile is included
701 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
702 CHECKFLAGS += $(NOSTDINC_FLAGS)
703
704 # warn about C99 declaration after statement
705 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
706
707 # disable pointer signed / unsigned warnings in gcc 4.0
708 KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
709
710 # disable invalid "can't wrap" optimizations for signed / pointers
711 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
712
713 # conserve stack if available
714 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
715
716 # disallow errors like 'EXPORT_GPL(foo);' with missing header
717 KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
718
719 # require functions to have arguments in prototypes, not empty 'int foo()'
720 KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
721
722 # Prohibit date/time macros, which would make the build non-deterministic
723 KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
724
725 # use the deterministic mode of AR if available
726 KBUILD_ARFLAGS := $(call ar-option,D)
727
728 # check for 'asm goto'
729 ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
730 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
731 endif
732
733 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
734 KBUILD_CPPFLAGS += $(KCPPFLAGS)
735 KBUILD_AFLAGS += $(KAFLAGS)
736 KBUILD_CFLAGS += $(KCFLAGS)
737
738 # Use --build-id when available.
739 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
740 $(call cc-ldoption, -Wl$(comma)--build-id,))
741 KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
742 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
743
744 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
745 LDFLAGS_vmlinux += $(call ld-option, -X,)
746 endif
747
748 # Default kernel image to build when no specific target is given.
749 # KBUILD_IMAGE may be overruled on the command line or
750 # set in the environment
751 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
752 # this default value
753 export KBUILD_IMAGE ?= vmlinux
754
755 #
756 # INSTALL_PATH specifies where to place the updated kernel and system map
757 # images. Default is /boot, but you can set it to other values
758 export INSTALL_PATH ?= /boot
759
760 #
761 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
762 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
763 # an argument if needed. Otherwise it defaults to the kernel install path
764 #
765 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
766
767 #
768 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
769 # relocations required by build roots. This is not defined in the
770 # makefile but the argument can be passed to make if needed.
771 #
772
773 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
774 export MODLIB
775
776 #
777 # INSTALL_MOD_STRIP, if defined, will cause modules to be
778 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
779 # the default option --strip-debug will be used. Otherwise,
780 # INSTALL_MOD_STRIP value will be used as the options to the strip command.
781
782 ifdef INSTALL_MOD_STRIP
783 ifeq ($(INSTALL_MOD_STRIP),1)
784 mod_strip_cmd = $(STRIP) --strip-debug
785 else
786 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
787 endif # INSTALL_MOD_STRIP=1
788 else
789 mod_strip_cmd = true
790 endif # INSTALL_MOD_STRIP
791 export mod_strip_cmd
792
793 # Select initial ramdisk compression format, default is gzip(1).
794 # This shall be used by the dracut(8) tool while creating an initramfs image.
795 #
796 INITRD_COMPRESS-y := gzip
797 INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
798 INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
799 INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
800 INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
801 INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
802 # do not export INITRD_COMPRESS, since we didn't actually
803 # choose a sane default compression above.
804 # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
805
806 ifdef CONFIG_MODULE_SIG_ALL
807 MODSECKEY = ./signing_key.priv
808 MODPUBKEY = ./signing_key.x509
809 export MODPUBKEY
810 mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
811 else
812 mod_sign_cmd = true
813 endif
814 export mod_sign_cmd
815
816
817 ifeq ($(KBUILD_EXTMOD),)
818 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
819
820 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
821 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
822 $(net-y) $(net-m) $(libs-y) $(libs-m)))
823
824 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
825 $(init-n) $(init-) \
826 $(core-n) $(core-) $(drivers-n) $(drivers-) \
827 $(net-n) $(net-) $(libs-n) $(libs-))))
828
829 init-y := $(patsubst %/, %/built-in.o, $(init-y))
830 core-y := $(patsubst %/, %/built-in.o, $(core-y))
831 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
832 net-y := $(patsubst %/, %/built-in.o, $(net-y))
833 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
834 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
835 libs-y := $(libs-y1) $(libs-y2)
836
837 # Externally visible symbols (used by link-vmlinux.sh)
838 export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
839 export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
840 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
841 export LDFLAGS_vmlinux
842 # used by scripts/pacmage/Makefile
843 export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
844
845 vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
846
847 # Final link of vmlinux
848 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
849 quiet_cmd_link-vmlinux = LINK $@
850
851 # Include targets which we want to
852 # execute if the rest of the kernel build went well.
853 vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
854 ifdef CONFIG_HEADERS_CHECK
855 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
856 endif
857 ifdef CONFIG_SAMPLES
858 $(Q)$(MAKE) $(build)=samples
859 endif
860 ifdef CONFIG_BUILD_DOCSRC
861 $(Q)$(MAKE) $(build)=Documentation
862 endif
863 +$(call if_changed,link-vmlinux)
864
865 # The actual objects are generated when descending,
866 # make sure no implicit rule kicks in
867 $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
868
869 # Handle descending into subdirectories listed in $(vmlinux-dirs)
870 # Preset locale variables to speed up the build process. Limit locale
871 # tweaks to this spot to avoid wrong language settings when running
872 # make menuconfig etc.
873 # Error messages still appears in the original language
874
875 PHONY += $(vmlinux-dirs)
876 $(vmlinux-dirs): prepare scripts
877 $(Q)$(MAKE) $(build)=$@
878
879 define filechk_kernel.release
880 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
881 endef
882
883 # Store (new) KERNELRELEASE string in include/config/kernel.release
884 include/config/kernel.release: include/config/auto.conf FORCE
885 $(call filechk,kernel.release)
886
887
888 # Things we need to do before we recursively start building the kernel
889 # or the modules are listed in "prepare".
890 # A multi level approach is used. prepareN is processed before prepareN-1.
891 # archprepare is used in arch Makefiles and when processed asm symlink,
892 # version.h and scripts_basic is processed / created.
893
894 # Listed in dependency order
895 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
896
897 # prepare3 is used to check if we are building in a separate output directory,
898 # and if so do:
899 # 1) Check that make has not been executed in the kernel src $(srctree)
900 prepare3: include/config/kernel.release
901 ifneq ($(KBUILD_SRC),)
902 @$(kecho) ' Using $(srctree) as source for kernel'
903 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
904 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
905 echo >&2 " in the '$(srctree)' directory.";\
906 /bin/false; \
907 fi;
908 endif
909
910 # prepare2 creates a makefile if using a separate output directory
911 prepare2: prepare3 outputmakefile asm-generic
912
913 prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
914 include/config/auto.conf
915 $(cmd_crmodverdir)
916
917 archprepare: archheaders archscripts prepare1 scripts_basic
918
919 prepare0: archprepare FORCE
920 $(Q)$(MAKE) $(build)=.
921
922 # All the preparing..
923 prepare: prepare0
924
925 # Generate some files
926 # ---------------------------------------------------------------------------
927
928 # KERNELRELEASE can change from a few different places, meaning version.h
929 # needs to be updated, so this check is forced on all builds
930
931 uts_len := 64
932 define filechk_utsrelease.h
933 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
934 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
935 exit 1; \
936 fi; \
937 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
938 endef
939
940 define filechk_version.h
941 (echo \#define LINUX_VERSION_CODE $(shell \
942 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
943 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
944 endef
945
946 $(version_h): $(srctree)/Makefile FORCE
947 $(call filechk,version.h)
948
949 include/generated/utsrelease.h: include/config/kernel.release FORCE
950 $(call filechk,utsrelease.h)
951
952 PHONY += headerdep
953 headerdep:
954 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
955 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
956
957 # ---------------------------------------------------------------------------
958
959 PHONY += depend dep
960 depend dep:
961 @echo '*** Warning: make $@ is unnecessary now.'
962
963 # ---------------------------------------------------------------------------
964 # Firmware install
965 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
966 export INSTALL_FW_PATH
967
968 PHONY += firmware_install
969 firmware_install: FORCE
970 @mkdir -p $(objtree)/firmware
971 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
972
973 # ---------------------------------------------------------------------------
974 # Kernel headers
975
976 #Default location for installed headers
977 export INSTALL_HDR_PATH = $(objtree)/usr
978
979 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
980
981 # If we do an all arch process set dst to asm-$(hdr-arch)
982 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
983
984 PHONY += archheaders
985 archheaders:
986
987 PHONY += archscripts
988 archscripts:
989
990 PHONY += __headers
991 __headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
992 $(Q)$(MAKE) $(build)=scripts build_unifdef
993
994 PHONY += headers_install_all
995 headers_install_all:
996 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
997
998 PHONY += headers_install
999 headers_install: __headers
1000 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1001 $(error Headers not exportable for the $(SRCARCH) architecture))
1002 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1003 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1004
1005 PHONY += headers_check_all
1006 headers_check_all: headers_install_all
1007 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1008
1009 PHONY += headers_check
1010 headers_check: headers_install
1011 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1012 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1013
1014 # ---------------------------------------------------------------------------
1015 # Modules
1016
1017 ifdef CONFIG_MODULES
1018
1019 # By default, build modules as well
1020
1021 all: modules
1022
1023 # Build modules
1024 #
1025 # A module can be listed more than once in obj-m resulting in
1026 # duplicate lines in modules.order files. Those are removed
1027 # using awk while concatenating to the final file.
1028
1029 PHONY += modules
1030 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1031 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1032 @$(kecho) ' Building modules, stage 2.';
1033 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1034 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1035
1036 modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1037 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1038
1039 %/modules.builtin: include/config/auto.conf
1040 $(Q)$(MAKE) $(modbuiltin)=$*
1041
1042
1043 # Target to prepare building external modules
1044 PHONY += modules_prepare
1045 modules_prepare: prepare scripts
1046
1047 # Target to install modules
1048 PHONY += modules_install
1049 modules_install: _modinst_ _modinst_post
1050
1051 PHONY += _modinst_
1052 _modinst_:
1053 @rm -rf $(MODLIB)/kernel
1054 @rm -f $(MODLIB)/source
1055 @mkdir -p $(MODLIB)/kernel
1056 @ln -s $(srctree) $(MODLIB)/source
1057 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1058 rm -f $(MODLIB)/build ; \
1059 ln -s $(objtree) $(MODLIB)/build ; \
1060 fi
1061 @cp -f $(objtree)/modules.order $(MODLIB)/
1062 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1063 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1064
1065 # This depmod is only for convenience to give the initial
1066 # boot a modules.dep even before / is mounted read-write. However the
1067 # boot script depmod is the master version.
1068 PHONY += _modinst_post
1069 _modinst_post: _modinst_
1070 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1071 $(call cmd,depmod)
1072
1073 ifeq ($(CONFIG_MODULE_SIG), y)
1074 PHONY += modules_sign
1075 modules_sign:
1076 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1077 endif
1078
1079 else # CONFIG_MODULES
1080
1081 # Modules not configured
1082 # ---------------------------------------------------------------------------
1083
1084 modules modules_install: FORCE
1085 @echo >&2
1086 @echo >&2 "The present kernel configuration has modules disabled."
1087 @echo >&2 "Type 'make config' and enable loadable module support."
1088 @echo >&2 "Then build a kernel with module support enabled."
1089 @echo >&2
1090 @exit 1
1091
1092 endif # CONFIG_MODULES
1093
1094 ###
1095 # Cleaning is done on three levels.
1096 # make clean Delete most generated files
1097 # Leave enough to build external modules
1098 # make mrproper Delete the current configuration, and all generated files
1099 # make distclean Remove editor backup files, patch leftover files and the like
1100
1101 # Directories & files removed with 'make clean'
1102 CLEAN_DIRS += $(MODVERDIR)
1103
1104 # Directories & files removed with 'make mrproper'
1105 MRPROPER_DIRS += include/config usr/include include/generated \
1106 arch/*/include/generated
1107 MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1108 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1109 signing_key.priv signing_key.x509 x509.genkey \
1110 extra_certificates signing_key.x509.keyid \
1111 signing_key.x509.signer include/linux/version.h
1112
1113 # clean - Delete most, but leave enough to build external modules
1114 #
1115 clean: rm-dirs := $(CLEAN_DIRS)
1116 clean: rm-files := $(CLEAN_FILES)
1117 clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1118
1119 PHONY += $(clean-dirs) clean archclean vmlinuxclean
1120 $(clean-dirs):
1121 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1122
1123 vmlinuxclean:
1124 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1125
1126 clean: archclean vmlinuxclean
1127
1128 # mrproper - Delete all generated files, including .config
1129 #
1130 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1131 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1132 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1133
1134 PHONY += $(mrproper-dirs) mrproper archmrproper
1135 $(mrproper-dirs):
1136 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1137
1138 mrproper: clean archmrproper $(mrproper-dirs)
1139 $(call cmd,rmdirs)
1140 $(call cmd,rmfiles)
1141
1142 # distclean
1143 #
1144 PHONY += distclean
1145
1146 distclean: mrproper
1147 @find $(srctree) $(RCS_FIND_IGNORE) \
1148 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1149 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1150 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1151 -type f -print | xargs rm -f
1152
1153
1154 # Packaging of the kernel to various formats
1155 # ---------------------------------------------------------------------------
1156 # rpm target kept for backward compatibility
1157 package-dir := $(srctree)/scripts/package
1158
1159 %src-pkg: FORCE
1160 $(Q)$(MAKE) $(build)=$(package-dir) $@
1161 %pkg: include/config/kernel.release FORCE
1162 $(Q)$(MAKE) $(build)=$(package-dir) $@
1163 rpm: include/config/kernel.release FORCE
1164 $(Q)$(MAKE) $(build)=$(package-dir) $@
1165
1166
1167 # Brief documentation of the typical targets used
1168 # ---------------------------------------------------------------------------
1169
1170 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1171 boards := $(notdir $(boards))
1172 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1173 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1174
1175 help:
1176 @echo 'Cleaning targets:'
1177 @echo ' clean - Remove most generated files but keep the config and'
1178 @echo ' enough build support to build external modules'
1179 @echo ' mrproper - Remove all generated files + config + various backup files'
1180 @echo ' distclean - mrproper + remove editor backup and patch files'
1181 @echo ''
1182 @echo 'Configuration targets:'
1183 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1184 @echo ''
1185 @echo 'Other generic targets:'
1186 @echo ' all - Build all targets marked with [*]'
1187 @echo '* vmlinux - Build the bare kernel'
1188 @echo '* modules - Build all modules'
1189 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1190 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1191 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1192 @echo ' dir/ - Build all files in dir and below'
1193 @echo ' dir/file.[oisS] - Build specified target only'
1194 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1195 @echo ' (requires a recent binutils and recent build (System.map))'
1196 @echo ' dir/file.ko - Build module including final link'
1197 @echo ' modules_prepare - Set up for building external modules'
1198 @echo ' tags/TAGS - Generate tags file for editors'
1199 @echo ' cscope - Generate cscope index'
1200 @echo ' gtags - Generate GNU GLOBAL index'
1201 @echo ' kernelrelease - Output the release version string'
1202 @echo ' kernelversion - Output the version stored in Makefile'
1203 @echo ' image_name - Output the image name'
1204 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1205 echo ' (default: $(INSTALL_HDR_PATH))'; \
1206 echo ''
1207 @echo 'Static analysers'
1208 @echo ' checkstack - Generate a list of stack hogs'
1209 @echo ' namespacecheck - Name space analysis on compiled kernel'
1210 @echo ' versioncheck - Sanity check on version.h usage'
1211 @echo ' includecheck - Check for duplicate included header files'
1212 @echo ' export_report - List the usages of all exported symbols'
1213 @echo ' headers_check - Sanity check on exported headers'
1214 @echo ' headerdep - Detect inclusion cycles in headers'
1215 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1216 @echo ''
1217 @echo 'Kernel packaging:'
1218 @$(MAKE) $(build)=$(package-dir) help
1219 @echo ''
1220 @echo 'Documentation targets:'
1221 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1222 @echo ''
1223 @echo 'Architecture specific targets ($(SRCARCH)):'
1224 @$(if $(archhelp),$(archhelp),\
1225 echo ' No architecture specific help defined for $(SRCARCH)')
1226 @echo ''
1227 @$(if $(boards), \
1228 $(foreach b, $(boards), \
1229 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1230 echo '')
1231 @$(if $(board-dirs), \
1232 $(foreach b, $(board-dirs), \
1233 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1234 printf " %-16s - Show all of the above\\n" help-boards; \
1235 echo '')
1236
1237 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1238 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1239 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1240 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1241 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1242 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1243 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1244 @echo ' 1: warnings which may be relevant and do not occur too often'
1245 @echo ' 2: warnings which occur quite often but may still be relevant'
1246 @echo ' 3: more obscure warnings, can most likely be ignored'
1247 @echo ' Multiple levels can be combined with W=12 or W=123'
1248 @echo ''
1249 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1250 @echo 'For further info see the ./README file'
1251
1252
1253 help-board-dirs := $(addprefix help-,$(board-dirs))
1254
1255 help-boards: $(help-board-dirs)
1256
1257 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1258
1259 $(help-board-dirs): help-%:
1260 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1261 @$(if $(boards-per-dir), \
1262 $(foreach b, $(boards-per-dir), \
1263 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1264 echo '')
1265
1266
1267 # Documentation targets
1268 # ---------------------------------------------------------------------------
1269 %docs: scripts_basic FORCE
1270 $(Q)$(MAKE) $(build)=scripts build_docproc
1271 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1272
1273 else # KBUILD_EXTMOD
1274
1275 ###
1276 # External module support.
1277 # When building external modules the kernel used as basis is considered
1278 # read-only, and no consistency checks are made and the make
1279 # system is not used on the basis kernel. If updates are required
1280 # in the basis kernel ordinary make commands (without M=...) must
1281 # be used.
1282 #
1283 # The following are the only valid targets when building external
1284 # modules.
1285 # make M=dir clean Delete all automatically generated files
1286 # make M=dir modules Make all modules in specified dir
1287 # make M=dir Same as 'make M=dir modules'
1288 # make M=dir modules_install
1289 # Install the modules built in the module directory
1290 # Assumes install directory is already created
1291
1292 # We are always building modules
1293 KBUILD_MODULES := 1
1294 PHONY += crmodverdir
1295 crmodverdir:
1296 $(cmd_crmodverdir)
1297
1298 PHONY += $(objtree)/Module.symvers
1299 $(objtree)/Module.symvers:
1300 @test -e $(objtree)/Module.symvers || ( \
1301 echo; \
1302 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1303 echo " is missing; modules will have no dependencies and modversions."; \
1304 echo )
1305
1306 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1307 PHONY += $(module-dirs) modules
1308 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1309 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1310
1311 modules: $(module-dirs)
1312 @$(kecho) ' Building modules, stage 2.';
1313 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1314
1315 PHONY += modules_install
1316 modules_install: _emodinst_ _emodinst_post
1317
1318 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1319 PHONY += _emodinst_
1320 _emodinst_:
1321 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1322 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1323
1324 PHONY += _emodinst_post
1325 _emodinst_post: _emodinst_
1326 $(call cmd,depmod)
1327
1328 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1329
1330 PHONY += $(clean-dirs) clean
1331 $(clean-dirs):
1332 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1333
1334 clean: rm-dirs := $(MODVERDIR)
1335 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1336
1337 help:
1338 @echo ' Building external modules.'
1339 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1340 @echo ''
1341 @echo ' modules - default target, build the module(s)'
1342 @echo ' modules_install - install the module'
1343 @echo ' clean - remove generated files in module directory only'
1344 @echo ''
1345
1346 # Dummies...
1347 PHONY += prepare scripts
1348 prepare: ;
1349 scripts: ;
1350 endif # KBUILD_EXTMOD
1351
1352 clean: $(clean-dirs)
1353 $(call cmd,rmdirs)
1354 $(call cmd,rmfiles)
1355 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1356 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1357 -o -name '*.ko.*' \
1358 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1359 -o -name '*.symtypes' -o -name 'modules.order' \
1360 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1361 -o -name '*.gcno' \) -type f -print | xargs rm -f
1362
1363 # Generate tags for editors
1364 # ---------------------------------------------------------------------------
1365 quiet_cmd_tags = GEN $@
1366 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1367
1368 tags TAGS cscope gtags: FORCE
1369 $(call cmd,tags)
1370
1371 # Scripts to check various things for consistency
1372 # ---------------------------------------------------------------------------
1373
1374 PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1375
1376 includecheck:
1377 find $(srctree)/* $(RCS_FIND_IGNORE) \
1378 -name '*.[hcS]' -type f -print | sort \
1379 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1380
1381 versioncheck:
1382 find $(srctree)/* $(RCS_FIND_IGNORE) \
1383 -name '*.[hcS]' -type f -print | sort \
1384 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1385
1386 coccicheck:
1387 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1388
1389 namespacecheck:
1390 $(PERL) $(srctree)/scripts/namespace.pl
1391
1392 export_report:
1393 $(PERL) $(srctree)/scripts/export_report.pl
1394
1395 endif #ifeq ($(config-targets),1)
1396 endif #ifeq ($(mixed-targets),1)
1397
1398 PHONY += checkstack kernelrelease kernelversion image_name
1399
1400 # UML needs a little special treatment here. It wants to use the host
1401 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1402 # else wants $(ARCH), including people doing cross-builds, which means
1403 # that $(SUBARCH) doesn't work here.
1404 ifeq ($(ARCH), um)
1405 CHECKSTACK_ARCH := $(SUBARCH)
1406 else
1407 CHECKSTACK_ARCH := $(ARCH)
1408 endif
1409 checkstack:
1410 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1411 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1412
1413 kernelrelease:
1414 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1415
1416 kernelversion:
1417 @echo $(KERNELVERSION)
1418
1419 image_name:
1420 @echo $(KBUILD_IMAGE)
1421
1422 # Clear a bunch of variables before executing the submake
1423 tools/: FORCE
1424 $(Q)mkdir -p $(objtree)/tools
1425 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1426
1427 tools/%: FORCE
1428 $(Q)mkdir -p $(objtree)/tools
1429 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1430
1431 # Single targets
1432 # ---------------------------------------------------------------------------
1433 # Single targets are compatible with:
1434 # - build with mixed source and output
1435 # - build with separate output dir 'make O=...'
1436 # - external modules
1437 #
1438 # target-dir => where to store outputfile
1439 # build-dir => directory in kernel source tree to use
1440
1441 ifeq ($(KBUILD_EXTMOD),)
1442 build-dir = $(patsubst %/,%,$(dir $@))
1443 target-dir = $(dir $@)
1444 else
1445 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1446 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1447 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1448 endif
1449
1450 %.s: %.c prepare scripts FORCE
1451 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1452 %.i: %.c prepare scripts FORCE
1453 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1454 %.o: %.c prepare scripts FORCE
1455 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1456 %.lst: %.c prepare scripts FORCE
1457 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1458 %.s: %.S prepare scripts FORCE
1459 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1460 %.o: %.S prepare scripts FORCE
1461 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1462 %.symtypes: %.c prepare scripts FORCE
1463 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1464
1465 # Modules
1466 /: prepare scripts FORCE
1467 $(cmd_crmodverdir)
1468 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1469 $(build)=$(build-dir)
1470 %/: prepare scripts FORCE
1471 $(cmd_crmodverdir)
1472 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1473 $(build)=$(build-dir)
1474 %.ko: prepare scripts FORCE
1475 $(cmd_crmodverdir)
1476 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1477 $(build)=$(build-dir) $(@:.ko=.o)
1478 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1479
1480 # FIXME Should go into a make.lib or something
1481 # ===========================================================================
1482
1483 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1484 cmd_rmdirs = rm -rf $(rm-dirs)
1485
1486 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1487 cmd_rmfiles = rm -f $(rm-files)
1488
1489 # Run depmod only if we have System.map and depmod is executable
1490 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1491 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1492 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1493
1494 # Create temporary dir for module support files
1495 # clean it up only when building all modules
1496 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1497 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1498
1499 # read all saved command lines
1500
1501 targets := $(wildcard $(sort $(targets)))
1502 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1503
1504 ifneq ($(cmd_files),)
1505 $(cmd_files): ; # Do not try to update included dependency files
1506 include $(cmd_files)
1507 endif
1508
1509 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1510 # Usage:
1511 # $(Q)$(MAKE) $(clean)=dir
1512 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1513
1514 endif # skip-makefile
1515
1516 PHONY += FORCE
1517 FORCE:
1518
1519 # Declare the contents of the .PHONY variable as phony. We keep that
1520 # information in a variable so we can use it in if_changed and friends.
1521 .PHONY: $(PHONY)
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