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