FreeBSD/Linux Kernel Cross Reference
sys/Makefile
1 VERSION = 2
2 PATCHLEVEL = 6
3 SUBLEVEL = 32
4 EXTRAVERSION = -rc3
5 NAME = Man-Eating Seals of Antiquity
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 # We are using a recursive build, so we need to do a little thinking
20 # to get the ordering right.
21 #
22 # Most importantly: sub-Makefiles should only ever modify files in
23 # their own directory. If in some directory we have a dependency on
24 # a file in another dir (which doesn't happen often, but it's often
25 # unavoidable when linking the built-in.o targets which finally
26 # turn into vmlinux), we will call a sub make in that other dir, and
27 # after that we are sure that everything which is in that other dir
28 # is now up to date.
29 #
30 # The only cases where we need to modify files which have global
31 # effects are thus separated out and done before the recursive
32 # descending is started. They are now explicitly listed as the
33 # prepare rule.
34
35 # To put more focus on warnings, be less verbose as default
36 # Use 'make V=1' to see the full commands
37
38 ifeq ("$(origin V)", "command line")
39 KBUILD_VERBOSE = $(V)
40 endif
41 ifndef KBUILD_VERBOSE
42 KBUILD_VERBOSE = 0
43 endif
44
45 # Call a source code checker (by default, "sparse") as part of the
46 # C compilation.
47 #
48 # Use 'make C=1' to enable checking of only re-compiled files.
49 # Use 'make C=2' to enable checking of *all* source files, regardless
50 # of whether they are re-compiled or not.
51 #
52 # See the file "Documentation/sparse.txt" for more details, including
53 # where to get the "sparse" utility.
54
55 ifeq ("$(origin C)", "command line")
56 KBUILD_CHECKSRC = $(C)
57 endif
58 ifndef KBUILD_CHECKSRC
59 KBUILD_CHECKSRC = 0
60 endif
61
62 # Use make M=dir to specify directory of external module to build
63 # Old syntax make ... SUBDIRS=$PWD is still supported
64 # Setting the environment variable KBUILD_EXTMOD take precedence
65 ifdef SUBDIRS
66 KBUILD_EXTMOD ?= $(SUBDIRS)
67 endif
68
69 ifeq ("$(origin M)", "command line")
70 KBUILD_EXTMOD := $(M)
71 endif
72
73 # kbuild supports saving output files in a separate directory.
74 # To locate output files in a separate directory two syntaxes are supported.
75 # In both cases the working directory must be the root of the kernel src.
76 # 1) O=
77 # Use "make O=dir/to/store/output/files/"
78 #
79 # 2) Set KBUILD_OUTPUT
80 # Set the environment variable KBUILD_OUTPUT to point to the directory
81 # where the output files shall be placed.
82 # export KBUILD_OUTPUT=dir/to/store/output/files/
83 # make
84 #
85 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
86 # variable.
87
88
89 # KBUILD_SRC is set on invocation of make in OBJ directory
90 # KBUILD_SRC is not intended to be used by the regular user (for now)
91 ifeq ($(KBUILD_SRC),)
92
93 # OK, Make called in directory where kernel src resides
94 # Do we want to locate output files in a separate directory?
95 ifeq ("$(origin O)", "command line")
96 KBUILD_OUTPUT := $(O)
97 endif
98
99 # That's our default target when none is given on the command line
100 PHONY := _all
101 _all:
102
103 # Cancel implicit rules on top Makefile
104 $(CURDIR)/Makefile Makefile: ;
105
106 ifneq ($(KBUILD_OUTPUT),)
107 # Invoke a second make in the output directory, passing relevant variables
108 # check that the output directory actually exists
109 saved-output := $(KBUILD_OUTPUT)
110 KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
111 $(if $(KBUILD_OUTPUT),, \
112 $(error output directory "$(saved-output)" does not exist))
113
114 PHONY += $(MAKECMDGOALS) sub-make
115
116 $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
117 $(Q)@:
118
119 sub-make: FORCE
120 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
121 KBUILD_SRC=$(CURDIR) \
122 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
123 $(filter-out _all sub-make,$(MAKECMDGOALS))
124
125 # Leave processing to above invocation of make
126 skip-makefile := 1
127 endif # ifneq ($(KBUILD_OUTPUT),)
128 endif # ifeq ($(KBUILD_SRC),)
129
130 # We process the rest of the Makefile if this is the final invocation of make
131 ifeq ($(skip-makefile),)
132
133 # If building an external module we do not care about the all: rule
134 # but instead _all depend on modules
135 PHONY += all
136 ifeq ($(KBUILD_EXTMOD),)
137 _all: all
138 else
139 _all: modules
140 endif
141
142 srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
143 objtree := $(CURDIR)
144 src := $(srctree)
145 obj := $(objtree)
146
147 VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
148
149 export srctree objtree VPATH
150
151
152 # SUBARCH tells the usermode build what the underlying arch is. That is set
153 # first, and if a usermode build is happening, the "ARCH=um" on the command
154 # line overrides the setting of ARCH below. If a native build is happening,
155 # then ARCH is assigned, getting whatever value it gets normally, and
156 # SUBARCH is subsequently ignored.
157
158 SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
159 -e s/arm.*/arm/ -e s/sa110/arm/ \
160 -e s/s390x/s390/ -e s/parisc64/parisc/ \
161 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
162 -e s/sh[234].*/sh/ )
163
164 # Cross compiling and selecting different set of gcc/bin-utils
165 # ---------------------------------------------------------------------------
166 #
167 # When performing cross compilation for other architectures ARCH shall be set
168 # to the target architecture. (See arch/* for the possibilities).
169 # ARCH can be set during invocation of make:
170 # make ARCH=ia64
171 # Another way is to have ARCH set in the environment.
172 # The default ARCH is the host where make is executed.
173
174 # CROSS_COMPILE specify the prefix used for all executables used
175 # during compilation. Only gcc and related bin-utils executables
176 # are prefixed with $(CROSS_COMPILE).
177 # CROSS_COMPILE can be set on the command line
178 # make CROSS_COMPILE=ia64-linux-
179 # Alternatively CROSS_COMPILE can be set in the environment.
180 # Default value for CROSS_COMPILE is not to prefix executables
181 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
182 #
183 # To force ARCH and CROSS_COMPILE settings include kernel.* files
184 # in the kernel tree - do not patch this file.
185 export KBUILD_BUILDHOST := $(SUBARCH)
186
187 # Kbuild save the ARCH and CROSS_COMPILE setting in kernel.* files.
188 # Restore these settings and check that user did not specify
189 # conflicting values.
190
191 saved_arch := $(shell cat include/generated/kernel.arch 2> /dev/null)
192 saved_cross := $(shell cat include/generated/kernel.cross 2> /dev/null)
193
194 ifneq ($(CROSS_COMPILE),)
195 ifneq ($(saved_cross),)
196 ifneq ($(CROSS_COMPILE),$(saved_cross))
197 $(error CROSS_COMPILE changed from \
198 "$(saved_cross)" to \
199 to "$(CROSS_COMPILE)". \
200 Use "make mrproper" to fix it up)
201 endif
202 endif
203 else
204 CROSS_COMPILE := $(saved_cross)
205 endif
206
207 ifneq ($(ARCH),)
208 ifneq ($(saved_arch),)
209 ifneq ($(saved_arch),$(ARCH))
210 $(error ARCH changed from \
211 "$(saved_arch)" to "$(ARCH)". \
212 Use "make mrproper" to fix it up)
213 endif
214 endif
215 else
216 ifneq ($(saved_arch),)
217 ARCH := $(saved_arch)
218 else
219 ARCH := $(SUBARCH)
220 endif
221 endif
222
223 # Architecture as present in compile.h
224 UTS_MACHINE := $(ARCH)
225 SRCARCH := $(ARCH)
226
227 # Additional ARCH settings for x86
228 ifeq ($(ARCH),i386)
229 SRCARCH := x86
230 endif
231 ifeq ($(ARCH),x86_64)
232 SRCARCH := x86
233 endif
234
235 # Additional ARCH settings for sparc
236 ifeq ($(ARCH),sparc64)
237 SRCARCH := sparc
238 endif
239
240 # Additional ARCH settings for sh
241 ifeq ($(ARCH),sh64)
242 SRCARCH := sh
243 endif
244
245 # Where to locate arch specific headers
246 hdr-arch := $(SRCARCH)
247
248 ifeq ($(ARCH),m68knommu)
249 hdr-arch := m68k
250 endif
251
252 KCONFIG_CONFIG ?= .config
253
254 # SHELL used by kbuild
255 CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
256 else if [ -x /bin/bash ]; then echo /bin/bash; \
257 else echo sh; fi ; fi)
258
259 HOSTCC = gcc
260 HOSTCXX = g++
261 HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
262 HOSTCXXFLAGS = -O2
263
264 # Decide whether to build built-in, modular, or both.
265 # Normally, just do built-in.
266
267 KBUILD_MODULES :=
268 KBUILD_BUILTIN := 1
269
270 # If we have only "make modules", don't compile built-in objects.
271 # When we're building modules with modversions, we need to consider
272 # the built-in objects during the descend as well, in order to
273 # make sure the checksums are up to date before we record them.
274
275 ifeq ($(MAKECMDGOALS),modules)
276 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
277 endif
278
279 # If we have "make <whatever> modules", compile modules
280 # in addition to whatever we do anyway.
281 # Just "make" or "make all" shall build modules as well
282
283 ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
284 KBUILD_MODULES := 1
285 endif
286
287 ifeq ($(MAKECMDGOALS),)
288 KBUILD_MODULES := 1
289 endif
290
291 export KBUILD_MODULES KBUILD_BUILTIN
292 export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
293
294 # Beautify output
295 # ---------------------------------------------------------------------------
296 #
297 # Normally, we echo the whole command before executing it. By making
298 # that echo $($(quiet)$(cmd)), we now have the possibility to set
299 # $(quiet) to choose other forms of output instead, e.g.
300 #
301 # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
302 # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
303 #
304 # If $(quiet) is empty, the whole command will be printed.
305 # If it is set to "quiet_", only the short version will be printed.
306 # If it is set to "silent_", nothing will be printed at all, since
307 # the variable $(silent_cmd_cc_o_c) doesn't exist.
308 #
309 # A simple variant is to prefix commands with $(Q) - that's useful
310 # for commands that shall be hidden in non-verbose mode.
311 #
312 # $(Q)ln $@ :<
313 #
314 # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
315 # If KBUILD_VERBOSE equals 1 then the above command is displayed.
316
317 ifeq ($(KBUILD_VERBOSE),1)
318 quiet =
319 Q =
320 else
321 quiet=quiet_
322 Q = @
323 endif
324
325 # If the user is running make -s (silent mode), suppress echoing of
326 # commands
327
328 ifneq ($(findstring s,$(MAKEFLAGS)),)
329 quiet=silent_
330 endif
331
332 export quiet Q KBUILD_VERBOSE
333
334
335 # Look for make include files relative to root of kernel src
336 MAKEFLAGS += --include-dir=$(srctree)
337
338 # We need some generic definitions (do not try to remake the file).
339 $(srctree)/scripts/Kbuild.include: ;
340 include $(srctree)/scripts/Kbuild.include
341
342 # Make variables (CC, etc...)
343
344 AS = $(CROSS_COMPILE)as
345 LD = $(CROSS_COMPILE)ld
346 CC = $(CROSS_COMPILE)gcc
347 CPP = $(CC) -E
348 AR = $(CROSS_COMPILE)ar
349 NM = $(CROSS_COMPILE)nm
350 STRIP = $(CROSS_COMPILE)strip
351 OBJCOPY = $(CROSS_COMPILE)objcopy
352 OBJDUMP = $(CROSS_COMPILE)objdump
353 AWK = awk
354 GENKSYMS = scripts/genksyms/genksyms
355 INSTALLKERNEL := installkernel
356 DEPMOD = /sbin/depmod
357 KALLSYMS = scripts/kallsyms
358 PERL = perl
359 CHECK = sparse
360
361 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
362 -Wbitwise -Wno-return-void $(CF)
363 MODFLAGS = -DMODULE
364 CFLAGS_MODULE = $(MODFLAGS)
365 AFLAGS_MODULE = $(MODFLAGS)
366 LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds
367 CFLAGS_KERNEL =
368 AFLAGS_KERNEL =
369 CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
370
371
372 # Use LINUXINCLUDE when you must reference the include/ directory.
373 # Needed to be compatible with the O= option
374 LINUXINCLUDE := -Iinclude \
375 $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
376 -I$(srctree)/arch/$(hdr-arch)/include \
377 -include include/linux/autoconf.h
378
379 KBUILD_CPPFLAGS := -D__KERNEL__
380
381 KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
382 -fno-strict-aliasing -fno-common \
383 -Werror-implicit-function-declaration \
384 -Wno-format-security \
385 -fno-delete-null-pointer-checks
386 KBUILD_AFLAGS := -D__ASSEMBLY__
387
388 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
389 KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
390 KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
391
392 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
393 export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
394 export CPP AR NM STRIP OBJCOPY OBJDUMP
395 export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
396 export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
397
398 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
399 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
400 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
401
402 # When compiling out-of-tree modules, put MODVERDIR in the module
403 # tree rather than in the kernel tree. The kernel tree might
404 # even be read-only.
405 export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
406
407 # Files to ignore in find ... statements
408
409 RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o
410 export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
411
412 # ===========================================================================
413 # Rules shared between *config targets and build targets
414
415 # Basic helpers built in scripts/
416 PHONY += scripts_basic
417 scripts_basic:
418 $(Q)$(MAKE) $(build)=scripts/basic
419
420 # To avoid any implicit rule to kick in, define an empty command.
421 scripts/basic/%: scripts_basic ;
422
423 PHONY += outputmakefile
424 # outputmakefile generates a Makefile in the output directory, if using a
425 # separate output directory. This allows convenient use of make in the
426 # output directory.
427 outputmakefile:
428 ifneq ($(KBUILD_SRC),)
429 $(Q)ln -fsn $(srctree) source
430 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
431 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
432 endif
433
434 # To make sure we do not include .config for any of the *config targets
435 # catch them early, and hand them over to scripts/kconfig/Makefile
436 # It is allowed to specify more targets when calling make, including
437 # mixing *config targets and build targets.
438 # For example 'make oldconfig all'.
439 # Detect when mixed targets is specified, and make a second invocation
440 # of make so .config is not included in this case either (for *config).
441
442 no-dot-config-targets := clean mrproper distclean \
443 cscope TAGS tags help %docs check% \
444 include/linux/version.h headers_% \
445 kernelrelease kernelversion
446
447 config-targets := 0
448 mixed-targets := 0
449 dot-config := 1
450
451 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
452 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
453 dot-config := 0
454 endif
455 endif
456
457 ifeq ($(KBUILD_EXTMOD),)
458 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
459 config-targets := 1
460 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
461 mixed-targets := 1
462 endif
463 endif
464 endif
465
466 ifeq ($(mixed-targets),1)
467 # ===========================================================================
468 # We're called with mixed targets (*config and build targets).
469 # Handle them one by one.
470
471 %:: FORCE
472 $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
473
474 else
475 ifeq ($(config-targets),1)
476 # ===========================================================================
477 # *config targets only - make sure prerequisites are updated, and descend
478 # in scripts/kconfig to make the *config target
479
480 # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
481 # KBUILD_DEFCONFIG may point out an alternative default configuration
482 # used for 'make defconfig'
483 include $(srctree)/arch/$(SRCARCH)/Makefile
484 export KBUILD_DEFCONFIG KBUILD_KCONFIG
485
486 # save ARCH & CROSS_COMPILE settings
487 $(shell mkdir -p include/generated && \
488 echo $(ARCH) > include/generated/kernel.arch && \
489 echo $(CROSS_COMPILE) > include/generated/kernel.cross)
490
491 config: scripts_basic outputmakefile FORCE
492 $(Q)mkdir -p include/linux include/config
493 $(Q)$(MAKE) $(build)=scripts/kconfig $@
494
495 %config: scripts_basic outputmakefile FORCE
496 $(Q)mkdir -p include/linux include/config
497 $(Q)$(MAKE) $(build)=scripts/kconfig $@
498
499 else
500 # ===========================================================================
501 # Build targets only - this includes vmlinux, arch specific targets, clean
502 # targets and others. In general all targets except *config targets.
503
504 ifeq ($(KBUILD_EXTMOD),)
505 # Additional helpers built in scripts/
506 # Carefully list dependencies so we do not try to build scripts twice
507 # in parallel
508 PHONY += scripts
509 scripts: scripts_basic include/config/auto.conf
510 $(Q)$(MAKE) $(build)=$(@)
511
512 # Objects we will link into vmlinux / subdirs we need to visit
513 init-y := init/
514 drivers-y := drivers/ sound/ firmware/
515 net-y := net/
516 libs-y := lib/
517 core-y := usr/
518 endif # KBUILD_EXTMOD
519
520 ifeq ($(dot-config),1)
521 # Read in config
522 -include include/config/auto.conf
523
524 ifeq ($(KBUILD_EXTMOD),)
525 # Read in dependencies to all Kconfig* files, make sure to run
526 # oldconfig if changes are detected.
527 -include include/config/auto.conf.cmd
528
529 # To avoid any implicit rule to kick in, define an empty command
530 $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
531
532 # If .config is newer than include/config/auto.conf, someone tinkered
533 # with it and forgot to run make oldconfig.
534 # if auto.conf.cmd is missing then we are probably in a cleaned tree so
535 # we execute the config step to be sure to catch updated Kconfig files
536 include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
537 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
538 else
539 # external modules needs include/linux/autoconf.h and include/config/auto.conf
540 # but do not care if they are up-to-date. Use auto.conf to trigger the test
541 PHONY += include/config/auto.conf
542
543 include/config/auto.conf:
544 $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
545 echo; \
546 echo " ERROR: Kernel configuration is invalid."; \
547 echo " include/linux/autoconf.h or $@ are missing."; \
548 echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
549 echo; \
550 /bin/false)
551
552 endif # KBUILD_EXTMOD
553
554 else
555 # Dummy target needed, because used as prerequisite
556 include/config/auto.conf: ;
557 endif # $(dot-config)
558
559 # The all: target is the default when no target is given on the
560 # command line.
561 # This allow a user to issue only 'make' to build a kernel including modules
562 # Defaults vmlinux but it is usually overridden in the arch makefile
563 all: vmlinux
564
565 ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
566 KBUILD_CFLAGS += -Os
567 else
568 KBUILD_CFLAGS += -O2
569 endif
570
571 include $(srctree)/arch/$(SRCARCH)/Makefile
572
573 ifneq ($(CONFIG_FRAME_WARN),0)
574 KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
575 endif
576
577 # Force gcc to behave correct even for buggy distributions
578 ifndef CONFIG_CC_STACKPROTECTOR
579 KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
580 endif
581
582 ifdef CONFIG_FRAME_POINTER
583 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
584 else
585 KBUILD_CFLAGS += -fomit-frame-pointer
586 endif
587
588 ifdef CONFIG_DEBUG_INFO
589 KBUILD_CFLAGS += -g
590 KBUILD_AFLAGS += -gdwarf-2
591 endif
592
593 ifdef CONFIG_FUNCTION_TRACER
594 KBUILD_CFLAGS += -pg
595 endif
596
597 # We trigger additional mismatches with less inlining
598 ifdef CONFIG_DEBUG_SECTION_MISMATCH
599 KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
600 endif
601
602 # arch Makefile may override CC so keep this after arch Makefile is included
603 NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
604 CHECKFLAGS += $(NOSTDINC_FLAGS)
605
606 # warn about C99 declaration after statement
607 KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
608
609 # disable pointer signed / unsigned warnings in gcc 4.0
610 KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
611
612 # disable invalid "can't wrap" optimizations for signed / pointers
613 KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
614
615 # revert to pre-gcc-4.4 behaviour of .eh_frame
616 KBUILD_CFLAGS += $(call cc-option,-fno-dwarf2-cfi-asm)
617
618 # conserve stack if available
619 KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
620
621 # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
622 # But warn user when we do so
623 warn-assign = \
624 $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
625
626 ifneq ($(KCPPFLAGS),)
627 $(call warn-assign,CPPFLAGS)
628 KBUILD_CPPFLAGS += $(KCPPFLAGS)
629 endif
630 ifneq ($(KAFLAGS),)
631 $(call warn-assign,AFLAGS)
632 KBUILD_AFLAGS += $(KAFLAGS)
633 endif
634 ifneq ($(KCFLAGS),)
635 $(call warn-assign,CFLAGS)
636 KBUILD_CFLAGS += $(KCFLAGS)
637 endif
638
639 # Use --build-id when available.
640 LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
641 $(call cc-ldoption, -Wl$(comma)--build-id,))
642 LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
643 LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
644
645 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
646 LDFLAGS_vmlinux += $(call ld-option, -X,)
647 endif
648
649 # Default kernel image to build when no specific target is given.
650 # KBUILD_IMAGE may be overruled on the command line or
651 # set in the environment
652 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
653 # this default value
654 export KBUILD_IMAGE ?= vmlinux
655
656 #
657 # INSTALL_PATH specifies where to place the updated kernel and system map
658 # images. Default is /boot, but you can set it to other values
659 export INSTALL_PATH ?= /boot
660
661 #
662 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
663 # relocations required by build roots. This is not defined in the
664 # makefile but the argument can be passed to make if needed.
665 #
666
667 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
668 export MODLIB
669
670 #
671 # INSTALL_MOD_STRIP, if defined, will cause modules to be
672 # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
673 # the default option --strip-debug will be used. Otherwise,
674 # INSTALL_MOD_STRIP will used as the options to the strip command.
675
676 ifdef INSTALL_MOD_STRIP
677 ifeq ($(INSTALL_MOD_STRIP),1)
678 mod_strip_cmd = $(STRIP) --strip-debug
679 else
680 mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
681 endif # INSTALL_MOD_STRIP=1
682 else
683 mod_strip_cmd = true
684 endif # INSTALL_MOD_STRIP
685 export mod_strip_cmd
686
687
688 ifeq ($(KBUILD_EXTMOD),)
689 core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
690
691 vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
692 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
693 $(net-y) $(net-m) $(libs-y) $(libs-m)))
694
695 vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
696 $(init-n) $(init-) \
697 $(core-n) $(core-) $(drivers-n) $(drivers-) \
698 $(net-n) $(net-) $(libs-n) $(libs-))))
699
700 init-y := $(patsubst %/, %/built-in.o, $(init-y))
701 core-y := $(patsubst %/, %/built-in.o, $(core-y))
702 drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
703 net-y := $(patsubst %/, %/built-in.o, $(net-y))
704 libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
705 libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
706 libs-y := $(libs-y1) $(libs-y2)
707
708 # Build vmlinux
709 # ---------------------------------------------------------------------------
710 # vmlinux is built from the objects selected by $(vmlinux-init) and
711 # $(vmlinux-main). Most are built-in.o files from top-level directories
712 # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
713 # Ordering when linking is important, and $(vmlinux-init) must be first.
714 #
715 # vmlinux
716 # ^
717 # |
718 # +-< $(vmlinux-init)
719 # | +--< init/version.o + more
720 # |
721 # +--< $(vmlinux-main)
722 # | +--< driver/built-in.o mm/built-in.o + more
723 # |
724 # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
725 #
726 # vmlinux version (uname -v) cannot be updated during normal
727 # descending-into-subdirs phase since we do not yet know if we need to
728 # update vmlinux.
729 # Therefore this step is delayed until just before final link of vmlinux -
730 # except in the kallsyms case where it is done just before adding the
731 # symbols to the kernel.
732 #
733 # System.map is generated to document addresses of all kernel symbols
734
735 vmlinux-init := $(head-y) $(init-y)
736 vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
737 vmlinux-all := $(vmlinux-init) $(vmlinux-main)
738 vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
739 export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
740
741 # Rule to link vmlinux - also used during CONFIG_KALLSYMS
742 # May be overridden by arch/$(ARCH)/Makefile
743 quiet_cmd_vmlinux__ ?= LD $@
744 cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
745 -T $(vmlinux-lds) $(vmlinux-init) \
746 --start-group $(vmlinux-main) --end-group \
747 $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
748
749 # Generate new vmlinux version
750 quiet_cmd_vmlinux_version = GEN .version
751 cmd_vmlinux_version = set -e; \
752 if [ ! -r .version ]; then \
753 rm -f .version; \
754 echo 1 >.version; \
755 else \
756 mv .version .old_version; \
757 expr 0$$(cat .old_version) + 1 >.version; \
758 fi; \
759 $(MAKE) $(build)=init
760
761 # Generate System.map
762 quiet_cmd_sysmap = SYSMAP
763 cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
764
765 # Link of vmlinux
766 # If CONFIG_KALLSYMS is set .version is already updated
767 # Generate System.map and verify that the content is consistent
768 # Use + in front of the vmlinux_version rule to silent warning with make -j2
769 # First command is ':' to allow us to use + in front of the rule
770 define rule_vmlinux__
771 :
772 $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
773
774 $(call cmd,vmlinux__)
775 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
776
777 $(Q)$(if $($(quiet)cmd_sysmap), \
778 echo ' $($(quiet)cmd_sysmap) System.map' &&) \
779 $(cmd_sysmap) $@ System.map; \
780 if [ $$? -ne 0 ]; then \
781 rm -f $@; \
782 /bin/false; \
783 fi;
784 $(verify_kallsyms)
785 endef
786
787
788 ifdef CONFIG_KALLSYMS
789 # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
790 # It's a three stage process:
791 # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
792 # empty
793 # Running kallsyms on that gives us .tmp_kallsyms1.o with
794 # the right size - vmlinux version (uname -v) is updated during this step
795 # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
796 # but due to the added section, some addresses have shifted.
797 # From here, we generate a correct .tmp_kallsyms2.o
798 # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
799 # o Verify that the System.map from vmlinux matches the map from
800 # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
801 # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
802 # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
803 # temporary bypass to allow the kernel to be built while the
804 # maintainers work out what went wrong with kallsyms.
805
806 ifdef CONFIG_KALLSYMS_EXTRA_PASS
807 last_kallsyms := 3
808 else
809 last_kallsyms := 2
810 endif
811
812 kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
813
814 define verify_kallsyms
815 $(Q)$(if $($(quiet)cmd_sysmap), \
816 echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
817 $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
818 $(Q)cmp -s System.map .tmp_System.map || \
819 (echo Inconsistent kallsyms data; \
820 echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
821 rm .tmp_kallsyms* ; /bin/false )
822 endef
823
824 # Update vmlinux version before link
825 # Use + in front of this rule to silent warning about make -j1
826 # First command is ':' to allow us to use + in front of this rule
827 cmd_ksym_ld = $(cmd_vmlinux__)
828 define rule_ksym_ld
829 :
830 +$(call cmd,vmlinux_version)
831 $(call cmd,vmlinux__)
832 $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
833 endef
834
835 # Generate .S file with all kernel symbols
836 quiet_cmd_kallsyms = KSYM $@
837 cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
838 $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
839
840 .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
841 $(call if_changed_dep,as_o_S)
842
843 .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
844 $(call cmd,kallsyms)
845
846 # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
847 .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
848 $(call if_changed_rule,ksym_ld)
849
850 .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
851 $(call if_changed,vmlinux__)
852
853 .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
854 $(call if_changed,vmlinux__)
855
856 # Needs to visit scripts/ before $(KALLSYMS) can be used.
857 $(KALLSYMS): scripts ;
858
859 # Generate some data for debugging strange kallsyms problems
860 debug_kallsyms: .tmp_map$(last_kallsyms)
861
862 .tmp_map%: .tmp_vmlinux% FORCE
863 ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
864
865 .tmp_map3: .tmp_map2
866
867 .tmp_map2: .tmp_map1
868
869 endif # ifdef CONFIG_KALLSYMS
870
871 # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
872 # relevant sections renamed as per the linker script.
873 quiet_cmd_vmlinux-modpost = LD $@
874 cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
875 $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
876 $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
877 define rule_vmlinux-modpost
878 :
879 +$(call cmd,vmlinux-modpost)
880 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
881 $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
882 endef
883
884 # vmlinux image - including updated kernel symbols
885 vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
886 ifdef CONFIG_HEADERS_CHECK
887 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
888 endif
889 ifdef CONFIG_SAMPLES
890 $(Q)$(MAKE) $(build)=samples
891 endif
892 ifdef CONFIG_BUILD_DOCSRC
893 $(Q)$(MAKE) $(build)=Documentation
894 endif
895 $(call vmlinux-modpost)
896 $(call if_changed_rule,vmlinux__)
897 $(Q)rm -f .old_version
898
899 # build vmlinux.o first to catch section mismatch errors early
900 ifdef CONFIG_KALLSYMS
901 .tmp_vmlinux1: vmlinux.o
902 endif
903
904 modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
905 vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
906 $(call if_changed_rule,vmlinux-modpost)
907
908 # The actual objects are generated when descending,
909 # make sure no implicit rule kicks in
910 $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
911
912 # Handle descending into subdirectories listed in $(vmlinux-dirs)
913 # Preset locale variables to speed up the build process. Limit locale
914 # tweaks to this spot to avoid wrong language settings when running
915 # make menuconfig etc.
916 # Error messages still appears in the original language
917
918 PHONY += $(vmlinux-dirs)
919 $(vmlinux-dirs): prepare scripts
920 $(Q)$(MAKE) $(build)=$@
921
922 # Build the kernel release string
923 #
924 # The KERNELRELEASE value built here is stored in the file
925 # include/config/kernel.release, and is used when executing several
926 # make targets, such as "make install" or "make modules_install."
927 #
928 # The eventual kernel release string consists of the following fields,
929 # shown in a hierarchical format to show how smaller parts are concatenated
930 # to form the larger and final value, with values coming from places like
931 # the Makefile, kernel config options, make command line options and/or
932 # SCM tag information.
933 #
934 # $(KERNELVERSION)
935 # $(VERSION) eg, 2
936 # $(PATCHLEVEL) eg, 6
937 # $(SUBLEVEL) eg, 18
938 # $(EXTRAVERSION) eg, -rc6
939 # $(localver-full)
940 # $(localver)
941 # localversion* (files without backups, containing '~')
942 # $(CONFIG_LOCALVERSION) (from kernel config setting)
943 # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
944 # ./scripts/setlocalversion (SCM tag, if one exists)
945 # $(LOCALVERSION) (from make command line if provided)
946 #
947 # Note how the final $(localver-auto) string is included *only* if the
948 # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
949 # moment, only git is supported but other SCMs can edit the script
950 # scripts/setlocalversion and add the appropriate checks as needed.
951
952 pattern = ".*/localversion[^~]*"
953 string = $(shell cat /dev/null \
954 `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
955
956 localver = $(subst $(space),, $(string) \
957 $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
958
959 # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
960 # and if the SCM is know a tag from the SCM is appended.
961 # The appended tag is determined by the SCM used.
962 #
963 # .scmversion is used when generating rpm packages so we do not loose
964 # the version information from the SCM when we do the build of the kernel
965 # from the copied source
966 ifdef CONFIG_LOCALVERSION_AUTO
967
968 ifeq ($(wildcard .scmversion),)
969 _localver-auto = $(shell $(CONFIG_SHELL) \
970 $(srctree)/scripts/setlocalversion $(srctree))
971 else
972 _localver-auto = $(shell cat .scmversion 2> /dev/null)
973 endif
974
975 localver-auto = $(LOCALVERSION)$(_localver-auto)
976 endif
977
978 localver-full = $(localver)$(localver-auto)
979
980 # Store (new) KERNELRELASE string in include/config/kernel.release
981 kernelrelease = $(KERNELVERSION)$(localver-full)
982 include/config/kernel.release: include/config/auto.conf FORCE
983 $(Q)rm -f $@
984 $(Q)echo $(kernelrelease) > $@
985
986
987 # Things we need to do before we recursively start building the kernel
988 # or the modules are listed in "prepare".
989 # A multi level approach is used. prepareN is processed before prepareN-1.
990 # archprepare is used in arch Makefiles and when processed asm symlink,
991 # version.h and scripts_basic is processed / created.
992
993 # Listed in dependency order
994 PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
995
996 # prepare3 is used to check if we are building in a separate output directory,
997 # and if so do:
998 # 1) Check that make has not been executed in the kernel src $(srctree)
999 # 2) Create the include2 directory, used for the second asm symlink
1000 prepare3: include/config/kernel.release
1001 ifneq ($(KBUILD_SRC),)
1002 @$(kecho) ' Using $(srctree) as source for kernel'
1003 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1004 echo " $(srctree) is not clean, please run 'make mrproper'";\
1005 echo " in the '$(srctree)' directory.";\
1006 /bin/false; \
1007 fi;
1008 $(Q)if [ ! -d include2 ]; then \
1009 mkdir -p include2; \
1010 ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm; \
1011 fi
1012 endif
1013
1014 # prepare2 creates a makefile if using a separate output directory
1015 prepare2: prepare3 outputmakefile
1016
1017 prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
1018 include/asm include/config/auto.conf
1019 $(cmd_crmodverdir)
1020
1021 archprepare: prepare1 scripts_basic
1022
1023 prepare0: archprepare FORCE
1024 $(Q)$(MAKE) $(build)=.
1025 $(Q)$(MAKE) $(build)=. missing-syscalls
1026
1027 # All the preparing..
1028 prepare: prepare0
1029
1030 # The asm symlink changes when $(ARCH) changes.
1031 # Detect this and ask user to run make mrproper
1032 # If asm is a stale symlink (point to dir that does not exist) remove it
1033 define check-symlink
1034 set -e; \
1035 if [ -L include/asm ]; then \
1036 asmlink=`readlink include/asm | cut -d '-' -f 2`; \
1037 if [ "$$asmlink" != "$(SRCARCH)" ]; then \
1038 echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
1039 echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
1040 exit 1; \
1041 fi; \
1042 test -e $$asmlink || rm include/asm; \
1043 elif [ -d include/asm ]; then \
1044 echo "ERROR: $@ is a directory but a symlink was expected";\
1045 exit 1; \
1046 fi
1047 endef
1048
1049 # We create the target directory of the symlink if it does
1050 # not exist so the test in check-symlink works and we have a
1051 # directory for generated filesas used by some architectures.
1052 define create-symlink
1053 if [ ! -L include/asm ]; then \
1054 $(kecho) ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
1055 if [ ! -d include/asm-$(SRCARCH) ]; then \
1056 mkdir -p include/asm-$(SRCARCH); \
1057 fi; \
1058 ln -fsn asm-$(SRCARCH) $@; \
1059 fi
1060 endef
1061
1062 include/asm: FORCE
1063 $(Q)$(check-symlink)
1064 $(Q)$(create-symlink)
1065
1066 # Generate some files
1067 # ---------------------------------------------------------------------------
1068
1069 # KERNELRELEASE can change from a few different places, meaning version.h
1070 # needs to be updated, so this check is forced on all builds
1071
1072 uts_len := 64
1073 define filechk_utsrelease.h
1074 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1075 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1076 exit 1; \
1077 fi; \
1078 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1079 endef
1080
1081 define filechk_version.h
1082 (echo \#define LINUX_VERSION_CODE $(shell \
1083 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1084 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1085 endef
1086
1087 include/linux/version.h: $(srctree)/Makefile FORCE
1088 $(call filechk,version.h)
1089
1090 include/linux/utsrelease.h: include/config/kernel.release FORCE
1091 $(call filechk,utsrelease.h)
1092
1093 PHONY += headerdep
1094 headerdep:
1095 $(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
1096
1097 # ---------------------------------------------------------------------------
1098
1099 PHONY += depend dep
1100 depend dep:
1101 @echo '*** Warning: make $@ is unnecessary now.'
1102
1103 # ---------------------------------------------------------------------------
1104 # Firmware install
1105 INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1106 export INSTALL_FW_PATH
1107
1108 PHONY += firmware_install
1109 firmware_install: FORCE
1110 @mkdir -p $(objtree)/firmware
1111 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1112
1113 # ---------------------------------------------------------------------------
1114 # Kernel headers
1115
1116 #Default location for installed headers
1117 export INSTALL_HDR_PATH = $(objtree)/usr
1118
1119 hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1120 # Find out where the Kbuild file is located to support
1121 # arch/$(ARCH)/include/asm
1122 hdr-dir = $(strip \
1123 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/asm/Kbuild), \
1124 arch/$(hdr-arch)/include/asm, include/asm-$(hdr-arch)))
1125
1126 # If we do an all arch process set dst to asm-$(hdr-arch)
1127 hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1128
1129 PHONY += __headers
1130 __headers: include/linux/version.h scripts_basic FORCE
1131 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1132
1133 PHONY += headers_install_all
1134 headers_install_all:
1135 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1136
1137 PHONY += headers_install
1138 headers_install: __headers
1139 $(if $(wildcard $(srctree)/$(hdr-dir)/Kbuild),, \
1140 $(error Headers not exportable for the $(SRCARCH) architecture))
1141 $(Q)$(MAKE) $(hdr-inst)=include
1142 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst)
1143
1144 PHONY += headers_check_all
1145 headers_check_all: headers_install_all
1146 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1147
1148 PHONY += headers_check
1149 headers_check: headers_install
1150 $(Q)$(MAKE) $(hdr-inst)=include HDRCHECK=1
1151 $(Q)$(MAKE) $(hdr-inst)=$(hdr-dir) $(hdr-dst) HDRCHECK=1
1152
1153 # ---------------------------------------------------------------------------
1154 # Modules
1155
1156 ifdef CONFIG_MODULES
1157
1158 # By default, build modules as well
1159
1160 all: modules
1161
1162 # Build modules
1163 #
1164 # A module can be listed more than once in obj-m resulting in
1165 # duplicate lines in modules.order files. Those are removed
1166 # using awk while concatenating to the final file.
1167
1168 PHONY += modules
1169 modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
1170 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1171 @$(kecho) ' Building modules, stage 2.';
1172 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1173 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1174
1175
1176 # Target to prepare building external modules
1177 PHONY += modules_prepare
1178 modules_prepare: prepare scripts
1179
1180 # Target to install modules
1181 PHONY += modules_install
1182 modules_install: _modinst_ _modinst_post
1183
1184 PHONY += _modinst_
1185 _modinst_:
1186 @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
1187 echo "Warning: you may need to install module-init-tools"; \
1188 echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
1189 sleep 1; \
1190 fi
1191 @rm -rf $(MODLIB)/kernel
1192 @rm -f $(MODLIB)/source
1193 @mkdir -p $(MODLIB)/kernel
1194 @ln -s $(srctree) $(MODLIB)/source
1195 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1196 rm -f $(MODLIB)/build ; \
1197 ln -s $(objtree) $(MODLIB)/build ; \
1198 fi
1199 @cp -f $(objtree)/modules.order $(MODLIB)/
1200 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1201
1202 # This depmod is only for convenience to give the initial
1203 # boot a modules.dep even before / is mounted read-write. However the
1204 # boot script depmod is the master version.
1205 PHONY += _modinst_post
1206 _modinst_post: _modinst_
1207 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1208 $(call cmd,depmod)
1209
1210 else # CONFIG_MODULES
1211
1212 # Modules not configured
1213 # ---------------------------------------------------------------------------
1214
1215 modules modules_install: FORCE
1216 @echo
1217 @echo "The present kernel configuration has modules disabled."
1218 @echo "Type 'make config' and enable loadable module support."
1219 @echo "Then build a kernel with module support enabled."
1220 @echo
1221 @exit 1
1222
1223 endif # CONFIG_MODULES
1224
1225 ###
1226 # Cleaning is done on three levels.
1227 # make clean Delete most generated files
1228 # Leave enough to build external modules
1229 # make mrproper Delete the current configuration, and all generated files
1230 # make distclean Remove editor backup files, patch leftover files and the like
1231
1232 # Directories & files removed with 'make clean'
1233 CLEAN_DIRS += $(MODVERDIR)
1234 CLEAN_FILES += vmlinux System.map \
1235 .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
1236
1237 # Directories & files removed with 'make mrproper'
1238 MRPROPER_DIRS += include/config include2 usr/include include/generated
1239 MRPROPER_FILES += .config .config.old include/asm .version .old_version \
1240 include/linux/autoconf.h include/linux/version.h \
1241 include/linux/utsrelease.h \
1242 include/linux/bounds.h include/asm*/asm-offsets.h \
1243 Module.symvers Module.markers tags TAGS cscope*
1244
1245 # clean - Delete most, but leave enough to build external modules
1246 #
1247 clean: rm-dirs := $(CLEAN_DIRS)
1248 clean: rm-files := $(CLEAN_FILES)
1249 clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs) Documentation)
1250
1251 PHONY += $(clean-dirs) clean archclean
1252 $(clean-dirs):
1253 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1254
1255 clean: archclean $(clean-dirs)
1256 $(call cmd,rmdirs)
1257 $(call cmd,rmfiles)
1258 @find . $(RCS_FIND_IGNORE) \
1259 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1260 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1261 -o -name '*.symtypes' -o -name 'modules.order' \
1262 -o -name 'Module.markers' -o -name '.tmp_*.o.*' \
1263 -o -name '*.gcno' \) -type f -print | xargs rm -f
1264
1265 # mrproper - Delete all generated files, including .config
1266 #
1267 mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1268 mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1269 mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1270
1271 PHONY += $(mrproper-dirs) mrproper archmrproper
1272 $(mrproper-dirs):
1273 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1274
1275 mrproper: clean archmrproper $(mrproper-dirs)
1276 $(call cmd,rmdirs)
1277 $(call cmd,rmfiles)
1278
1279 # distclean
1280 #
1281 PHONY += distclean
1282
1283 distclean: mrproper
1284 @find $(srctree) $(RCS_FIND_IGNORE) \
1285 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1286 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1287 -o -name '.*.rej' -o -size 0 \
1288 -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
1289 -type f -print | xargs rm -f
1290
1291
1292 # Packaging of the kernel to various formats
1293 # ---------------------------------------------------------------------------
1294 # rpm target kept for backward compatibility
1295 package-dir := $(srctree)/scripts/package
1296
1297 %pkg: include/config/kernel.release FORCE
1298 $(Q)$(MAKE) $(build)=$(package-dir) $@
1299 rpm: include/config/kernel.release FORCE
1300 $(Q)$(MAKE) $(build)=$(package-dir) $@
1301
1302
1303 # Brief documentation of the typical targets used
1304 # ---------------------------------------------------------------------------
1305
1306 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1307 boards := $(notdir $(boards))
1308 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1309 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1310
1311 help:
1312 @echo 'Cleaning targets:'
1313 @echo ' clean - Remove most generated files but keep the config and'
1314 @echo ' enough build support to build external modules'
1315 @echo ' mrproper - Remove all generated files + config + various backup files'
1316 @echo ' distclean - mrproper + remove editor backup and patch files'
1317 @echo ''
1318 @echo 'Configuration targets:'
1319 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1320 @echo ''
1321 @echo 'Other generic targets:'
1322 @echo ' all - Build all targets marked with [*]'
1323 @echo '* vmlinux - Build the bare kernel'
1324 @echo '* modules - Build all modules'
1325 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1326 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1327 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1328 @echo ' dir/ - Build all files in dir and below'
1329 @echo ' dir/file.[ois] - Build specified target only'
1330 @echo ' dir/file.ko - Build module including final link'
1331 @echo ' modules_prepare - Set up for building external modules'
1332 @echo ' tags/TAGS - Generate tags file for editors'
1333 @echo ' cscope - Generate cscope index'
1334 @echo ' kernelrelease - Output the release version string'
1335 @echo ' kernelversion - Output the version stored in Makefile'
1336 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1337 echo ' (default: $(INSTALL_HDR_PATH))'; \
1338 echo ''
1339 @echo 'Static analysers'
1340 @echo ' checkstack - Generate a list of stack hogs'
1341 @echo ' namespacecheck - Name space analysis on compiled kernel'
1342 @echo ' versioncheck - Sanity check on version.h usage'
1343 @echo ' includecheck - Check for duplicate included header files'
1344 @echo ' export_report - List the usages of all exported symbols'
1345 @echo ' headers_check - Sanity check on exported headers'
1346 @echo ' headerdep - Detect inclusion cycles in headers'; \
1347 echo ''
1348 @echo 'Kernel packaging:'
1349 @$(MAKE) $(build)=$(package-dir) help
1350 @echo ''
1351 @echo 'Documentation targets:'
1352 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1353 @echo ''
1354 @echo 'Architecture specific targets ($(SRCARCH)):'
1355 @$(if $(archhelp),$(archhelp),\
1356 echo ' No architecture specific help defined for $(SRCARCH)')
1357 @echo ''
1358 @$(if $(boards), \
1359 $(foreach b, $(boards), \
1360 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1361 echo '')
1362 @$(if $(board-dirs), \
1363 $(foreach b, $(board-dirs), \
1364 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1365 printf " %-16s - Show all of the above\\n" help-boards; \
1366 echo '')
1367
1368 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1369 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1370 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1371 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1372 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1373 @echo ''
1374 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1375 @echo 'For further info see the ./README file'
1376
1377
1378 help-board-dirs := $(addprefix help-,$(board-dirs))
1379
1380 help-boards: $(help-board-dirs)
1381
1382 boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1383
1384 $(help-board-dirs): help-%:
1385 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1386 @$(if $(boards-per-dir), \
1387 $(foreach b, $(boards-per-dir), \
1388 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1389 echo '')
1390
1391
1392 # Documentation targets
1393 # ---------------------------------------------------------------------------
1394 %docs: scripts_basic FORCE
1395 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1396
1397 else # KBUILD_EXTMOD
1398
1399 ###
1400 # External module support.
1401 # When building external modules the kernel used as basis is considered
1402 # read-only, and no consistency checks are made and the make
1403 # system is not used on the basis kernel. If updates are required
1404 # in the basis kernel ordinary make commands (without M=...) must
1405 # be used.
1406 #
1407 # The following are the only valid targets when building external
1408 # modules.
1409 # make M=dir clean Delete all automatically generated files
1410 # make M=dir modules Make all modules in specified dir
1411 # make M=dir Same as 'make M=dir modules'
1412 # make M=dir modules_install
1413 # Install the modules built in the module directory
1414 # Assumes install directory is already created
1415
1416 # We are always building modules
1417 KBUILD_MODULES := 1
1418 PHONY += crmodverdir
1419 crmodverdir:
1420 $(cmd_crmodverdir)
1421
1422 PHONY += $(objtree)/Module.symvers
1423 $(objtree)/Module.symvers:
1424 @test -e $(objtree)/Module.symvers || ( \
1425 echo; \
1426 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1427 echo " is missing; modules will have no dependencies and modversions."; \
1428 echo )
1429
1430 module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1431 PHONY += $(module-dirs) modules
1432 $(module-dirs): crmodverdir $(objtree)/Module.symvers
1433 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1434
1435 modules: $(module-dirs)
1436 @$(kecho) ' Building modules, stage 2.';
1437 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1438
1439 PHONY += modules_install
1440 modules_install: _emodinst_ _emodinst_post
1441
1442 install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1443 PHONY += _emodinst_
1444 _emodinst_:
1445 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1446 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1447
1448 PHONY += _emodinst_post
1449 _emodinst_post: _emodinst_
1450 $(call cmd,depmod)
1451
1452 clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1453
1454 PHONY += $(clean-dirs) clean
1455 $(clean-dirs):
1456 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1457
1458 clean: rm-dirs := $(MODVERDIR)
1459 clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
1460 $(KBUILD_EXTMOD)/Module.markers \
1461 $(KBUILD_EXTMOD)/modules.order
1462 clean: $(clean-dirs)
1463 $(call cmd,rmdirs)
1464 $(call cmd,rmfiles)
1465 @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
1466 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1467 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1468 -o -name '*.gcno' \) -type f -print | xargs rm -f
1469
1470 help:
1471 @echo ' Building external modules.'
1472 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1473 @echo ''
1474 @echo ' modules - default target, build the module(s)'
1475 @echo ' modules_install - install the module'
1476 @echo ' clean - remove generated files in module directory only'
1477 @echo ''
1478
1479 # Dummies...
1480 PHONY += prepare scripts
1481 prepare: ;
1482 scripts: ;
1483 endif # KBUILD_EXTMOD
1484
1485 # Generate tags for editors
1486 # ---------------------------------------------------------------------------
1487 quiet_cmd_tags = GEN $@
1488 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1489
1490 tags TAGS cscope: FORCE
1491 $(call cmd,tags)
1492
1493 # Scripts to check various things for consistency
1494 # ---------------------------------------------------------------------------
1495
1496 includecheck:
1497 find * $(RCS_FIND_IGNORE) \
1498 -name '*.[hcS]' -type f -print | sort \
1499 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1500
1501 versioncheck:
1502 find * $(RCS_FIND_IGNORE) \
1503 -name '*.[hcS]' -type f -print | sort \
1504 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1505
1506 namespacecheck:
1507 $(PERL) $(srctree)/scripts/namespace.pl
1508
1509 export_report:
1510 $(PERL) $(srctree)/scripts/export_report.pl
1511
1512 endif #ifeq ($(config-targets),1)
1513 endif #ifeq ($(mixed-targets),1)
1514
1515 PHONY += checkstack kernelrelease kernelversion
1516
1517 # UML needs a little special treatment here. It wants to use the host
1518 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1519 # else wants $(ARCH), including people doing cross-builds, which means
1520 # that $(SUBARCH) doesn't work here.
1521 ifeq ($(ARCH), um)
1522 CHECKSTACK_ARCH := $(SUBARCH)
1523 else
1524 CHECKSTACK_ARCH := $(ARCH)
1525 endif
1526 checkstack:
1527 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1528 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1529
1530 kernelrelease:
1531 $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
1532 $(error kernelrelease not valid - run 'make prepare' to update it))
1533 kernelversion:
1534 @echo $(KERNELVERSION)
1535
1536 # Single targets
1537 # ---------------------------------------------------------------------------
1538 # Single targets are compatible with:
1539 # - build with mixed source and output
1540 # - build with separate output dir 'make O=...'
1541 # - external modules
1542 #
1543 # target-dir => where to store outputfile
1544 # build-dir => directory in kernel source tree to use
1545
1546 ifeq ($(KBUILD_EXTMOD),)
1547 build-dir = $(patsubst %/,%,$(dir $@))
1548 target-dir = $(dir $@)
1549 else
1550 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1551 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1552 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1553 endif
1554
1555 %.s: %.c prepare scripts FORCE
1556 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1557 %.i: %.c prepare scripts FORCE
1558 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1559 %.o: %.c prepare scripts FORCE
1560 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1561 %.lst: %.c prepare scripts FORCE
1562 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1563 %.s: %.S prepare scripts FORCE
1564 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1565 %.o: %.S prepare scripts FORCE
1566 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1567 %.symtypes: %.c prepare scripts FORCE
1568 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1569
1570 # Modules
1571 /: prepare scripts FORCE
1572 $(cmd_crmodverdir)
1573 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1574 $(build)=$(build-dir)
1575 %/: prepare scripts FORCE
1576 $(cmd_crmodverdir)
1577 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1578 $(build)=$(build-dir)
1579 %.ko: prepare scripts FORCE
1580 $(cmd_crmodverdir)
1581 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1582 $(build)=$(build-dir) $(@:.ko=.o)
1583 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1584
1585 # FIXME Should go into a make.lib or something
1586 # ===========================================================================
1587
1588 quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1589 cmd_rmdirs = rm -rf $(rm-dirs)
1590
1591 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1592 cmd_rmfiles = rm -f $(rm-files)
1593
1594 # Run depmod only if we have System.map and depmod is executable
1595 quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1596 cmd_depmod = \
1597 if [ -r System.map -a -x $(DEPMOD) ]; then \
1598 $(DEPMOD) -ae -F System.map \
1599 $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) ) \
1600 $(KERNELRELEASE); \
1601 fi
1602
1603 # Create temporary dir for module support files
1604 # clean it up only when building all modules
1605 cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1606 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1607
1608 a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
1609 $(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(KBUILD_CPPFLAGS) \
1610 $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
1611
1612 quiet_cmd_as_o_S = AS $@
1613 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
1614
1615 # read all saved command lines
1616
1617 targets := $(wildcard $(sort $(targets)))
1618 cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1619
1620 ifneq ($(cmd_files),)
1621 $(cmd_files): ; # Do not try to update included dependency files
1622 include $(cmd_files)
1623 endif
1624
1625 # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1626 # Usage:
1627 # $(Q)$(MAKE) $(clean)=dir
1628 clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1629
1630 endif # skip-makefile
1631
1632 PHONY += FORCE
1633 FORCE:
1634
1635 # Declare the contents of the .PHONY variable as phony. We keep that
1636 # information in a variable so we can use it in if_changed and friends.
1637 .PHONY: $(PHONY)
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