Makefile 54 KB

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  1. VERSION = 2
  2. PATCHLEVEL = 6
  3. SUBLEVEL = 26
  4. EXTRAVERSION =
  5. NAME = Rotary Wombat
  6. # *DOCUMENTATION*
  7. # To see a list of typical targets execute "make help"
  8. # More info can be located in ./README
  9. # Comments in this file are targeted only to the developer, do not
  10. # expect to learn how to build the kernel reading this file.
  11. # Do not:
  12. # o use make's built-in rules and variables
  13. # (this increases performance and avoids hard-to-debug behaviour);
  14. # o print "Entering directory ...";
  15. MAKEFLAGS += -rR --no-print-directory
  16. # We are using a recursive build, so we need to do a little thinking
  17. # to get the ordering right.
  18. #
  19. # Most importantly: sub-Makefiles should only ever modify files in
  20. # their own directory. If in some directory we have a dependency on
  21. # a file in another dir (which doesn't happen often, but it's often
  22. # unavoidable when linking the built-in.o targets which finally
  23. # turn into vmlinux), we will call a sub make in that other dir, and
  24. # after that we are sure that everything which is in that other dir
  25. # is now up to date.
  26. #
  27. # The only cases where we need to modify files which have global
  28. # effects are thus separated out and done before the recursive
  29. # descending is started. They are now explicitly listed as the
  30. # prepare rule.
  31. # To put more focus on warnings, be less verbose as default
  32. # Use 'make V=1' to see the full commands
  33. ifdef V
  34. ifeq ("$(origin V)", "command line")
  35. KBUILD_VERBOSE = $(V)
  36. endif
  37. endif
  38. ifndef KBUILD_VERBOSE
  39. KBUILD_VERBOSE = 0
  40. endif
  41. # Call a source code checker (by default, "sparse") as part of the
  42. # C compilation.
  43. #
  44. # Use 'make C=1' to enable checking of only re-compiled files.
  45. # Use 'make C=2' to enable checking of *all* source files, regardless
  46. # of whether they are re-compiled or not.
  47. #
  48. # See the file "Documentation/sparse.txt" for more details, including
  49. # where to get the "sparse" utility.
  50. ifdef C
  51. ifeq ("$(origin C)", "command line")
  52. KBUILD_CHECKSRC = $(C)
  53. endif
  54. endif
  55. ifndef KBUILD_CHECKSRC
  56. KBUILD_CHECKSRC = 0
  57. endif
  58. # Use make M=dir to specify directory of external module to build
  59. # Old syntax make ... SUBDIRS=$PWD is still supported
  60. # Setting the environment variable KBUILD_EXTMOD take precedence
  61. ifdef SUBDIRS
  62. KBUILD_EXTMOD ?= $(SUBDIRS)
  63. endif
  64. ifdef M
  65. ifeq ("$(origin M)", "command line")
  66. KBUILD_EXTMOD := $(M)
  67. endif
  68. endif
  69. # kbuild supports saving output files in a separate directory.
  70. # To locate output files in a separate directory two syntaxes are supported.
  71. # In both cases the working directory must be the root of the kernel src.
  72. # 1) O=
  73. # Use "make O=dir/to/store/output/files/"
  74. #
  75. # 2) Set KBUILD_OUTPUT
  76. # Set the environment variable KBUILD_OUTPUT to point to the directory
  77. # where the output files shall be placed.
  78. # export KBUILD_OUTPUT=dir/to/store/output/files/
  79. # make
  80. #
  81. # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  82. # variable.
  83. # KBUILD_SRC is set on invocation of make in OBJ directory
  84. # KBUILD_SRC is not intended to be used by the regular user (for now)
  85. ifeq ($(KBUILD_SRC),)
  86. # OK, Make called in directory where kernel src resides
  87. # Do we want to locate output files in a separate directory?
  88. ifdef O
  89. ifeq ("$(origin O)", "command line")
  90. KBUILD_OUTPUT := $(O)
  91. endif
  92. endif
  93. # That's our default target when none is given on the command line
  94. PHONY := _all
  95. _all:
  96. # Cancel implicit rules on top Makefile
  97. $(CURDIR)/Makefile Makefile: ;
  98. ifneq ($(KBUILD_OUTPUT),)
  99. # Invoke a second make in the output directory, passing relevant variables
  100. # check that the output directory actually exists
  101. saved-output := $(KBUILD_OUTPUT)
  102. KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
  103. $(if $(KBUILD_OUTPUT),, \
  104. $(error output directory "$(saved-output)" does not exist))
  105. PHONY += $(MAKECMDGOALS) sub-make
  106. $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
  107. $(Q)@:
  108. sub-make: FORCE
  109. $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
  110. KBUILD_SRC=$(CURDIR) \
  111. KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
  112. $(filter-out _all sub-make,$(MAKECMDGOALS))
  113. # Leave processing to above invocation of make
  114. skip-makefile := 1
  115. endif # ifneq ($(KBUILD_OUTPUT),)
  116. endif # ifeq ($(KBUILD_SRC),)
  117. # We process the rest of the Makefile if this is the final invocation of make
  118. ifeq ($(skip-makefile),)
  119. # If building an external module we do not care about the all: rule
  120. # but instead _all depend on modules
  121. PHONY += all
  122. ifeq ($(KBUILD_EXTMOD),)
  123. _all: all
  124. else
  125. _all: modules
  126. endif
  127. srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
  128. TOPDIR := $(srctree)
  129. # FIXME - TOPDIR is obsolete, use srctree/objtree
  130. objtree := $(CURDIR)
  131. src := $(srctree)
  132. obj := $(objtree)
  133. VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
  134. export srctree objtree VPATH TOPDIR
  135. # SUBARCH tells the usermode build what the underlying arch is. That is set
  136. # first, and if a usermode build is happening, the "ARCH=um" on the command
  137. # line overrides the setting of ARCH below. If a native build is happening,
  138. # then ARCH is assigned, getting whatever value it gets normally, and
  139. # SUBARCH is subsequently ignored.
  140. SUBARCH := $(shell uname -m | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
  141. -e s/arm.*/arm/ -e s/sa110/arm/ \
  142. -e s/s390x/s390/ -e s/parisc64/parisc/ \
  143. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  144. -e s/sh.*/sh/ )
  145. # Cross compiling and selecting different set of gcc/bin-utils
  146. # ---------------------------------------------------------------------------
  147. #
  148. # When performing cross compilation for other architectures ARCH shall be set
  149. # to the target architecture. (See arch/* for the possibilities).
  150. # ARCH can be set during invocation of make:
  151. # make ARCH=ia64
  152. # Another way is to have ARCH set in the environment.
  153. # The default ARCH is the host where make is executed.
  154. # CROSS_COMPILE specify the prefix used for all executables used
  155. # during compilation. Only gcc and related bin-utils executables
  156. # are prefixed with $(CROSS_COMPILE).
  157. # CROSS_COMPILE can be set on the command line
  158. # make CROSS_COMPILE=ia64-linux-
  159. # Alternatively CROSS_COMPILE can be set in the environment.
  160. # Default value for CROSS_COMPILE is not to prefix executables
  161. # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  162. export KBUILD_BUILDHOST := $(SUBARCH)
  163. ARCH ?= $(SUBARCH)
  164. CROSS_COMPILE ?=
  165. # Architecture as present in compile.h
  166. UTS_MACHINE := $(ARCH)
  167. SRCARCH := $(ARCH)
  168. # Additional ARCH settings for x86
  169. ifeq ($(ARCH),i386)
  170. SRCARCH := x86
  171. endif
  172. ifeq ($(ARCH),x86_64)
  173. SRCARCH := x86
  174. endif
  175. KCONFIG_CONFIG ?= .config
  176. # SHELL used by kbuild
  177. CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  178. else if [ -x /bin/bash ]; then echo /bin/bash; \
  179. else echo sh; fi ; fi)
  180. HOSTCC = gcc
  181. HOSTCXX = g++
  182. HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
  183. HOSTCXXFLAGS = -O2
  184. # Decide whether to build built-in, modular, or both.
  185. # Normally, just do built-in.
  186. KBUILD_MODULES :=
  187. KBUILD_BUILTIN := 1
  188. # If we have only "make modules", don't compile built-in objects.
  189. # When we're building modules with modversions, we need to consider
  190. # the built-in objects during the descend as well, in order to
  191. # make sure the checksums are up to date before we record them.
  192. ifeq ($(MAKECMDGOALS),modules)
  193. KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  194. endif
  195. # If we have "make <whatever> modules", compile modules
  196. # in addition to whatever we do anyway.
  197. # Just "make" or "make all" shall build modules as well
  198. ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  199. KBUILD_MODULES := 1
  200. endif
  201. ifeq ($(MAKECMDGOALS),)
  202. KBUILD_MODULES := 1
  203. endif
  204. export KBUILD_MODULES KBUILD_BUILTIN
  205. export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
  206. # Beautify output
  207. # ---------------------------------------------------------------------------
  208. #
  209. # Normally, we echo the whole command before executing it. By making
  210. # that echo $($(quiet)$(cmd)), we now have the possibility to set
  211. # $(quiet) to choose other forms of output instead, e.g.
  212. #
  213. # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  214. # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  215. #
  216. # If $(quiet) is empty, the whole command will be printed.
  217. # If it is set to "quiet_", only the short version will be printed.
  218. # If it is set to "silent_", nothing will be printed at all, since
  219. # the variable $(silent_cmd_cc_o_c) doesn't exist.
  220. #
  221. # A simple variant is to prefix commands with $(Q) - that's useful
  222. # for commands that shall be hidden in non-verbose mode.
  223. #
  224. # $(Q)ln $@ :<
  225. #
  226. # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  227. # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  228. ifeq ($(KBUILD_VERBOSE),1)
  229. quiet =
  230. Q =
  231. else
  232. quiet=quiet_
  233. Q = @
  234. endif
  235. # If the user is running make -s (silent mode), suppress echoing of
  236. # commands
  237. ifneq ($(findstring s,$(MAKEFLAGS)),)
  238. quiet=silent_
  239. endif
  240. export quiet Q KBUILD_VERBOSE
  241. # Look for make include files relative to root of kernel src
  242. MAKEFLAGS += --include-dir=$(srctree)
  243. # We need some generic definitions (do not try to remake the file).
  244. $(srctree)/scripts/Kbuild.include: ;
  245. include $(srctree)/scripts/Kbuild.include
  246. # Make variables (CC, etc...)
  247. AS = $(CROSS_COMPILE)as
  248. LD = $(CROSS_COMPILE)ld
  249. CC = $(CROSS_COMPILE)gcc
  250. CPP = $(CC) -E
  251. AR = $(CROSS_COMPILE)ar
  252. NM = $(CROSS_COMPILE)nm
  253. STRIP = $(CROSS_COMPILE)strip
  254. OBJCOPY = $(CROSS_COMPILE)objcopy
  255. OBJDUMP = $(CROSS_COMPILE)objdump
  256. AWK = awk
  257. GENKSYMS = scripts/genksyms/genksyms
  258. DEPMOD = /sbin/depmod
  259. KALLSYMS = scripts/kallsyms
  260. PERL = perl
  261. CHECK = sparse
  262. CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
  263. MODFLAGS = -DMODULE
  264. CFLAGS_MODULE = $(MODFLAGS)
  265. AFLAGS_MODULE = $(MODFLAGS)
  266. LDFLAGS_MODULE =
  267. CFLAGS_KERNEL =
  268. AFLAGS_KERNEL =
  269. # Use LINUXINCLUDE when you must reference the include/ directory.
  270. # Needed to be compatible with the O= option
  271. LINUXINCLUDE := -Iinclude \
  272. $(if $(KBUILD_SRC),-Iinclude2 -I$(srctree)/include) \
  273. -include include/linux/autoconf.h
  274. KBUILD_CPPFLAGS := -D__KERNEL__ $(LINUXINCLUDE)
  275. KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
  276. -fno-strict-aliasing -fno-common \
  277. -Werror-implicit-function-declaration
  278. KBUILD_AFLAGS := -D__ASSEMBLY__
  279. # Read KERNELRELEASE from include/config/kernel.release (if it exists)
  280. KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
  281. KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
  282. export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
  283. export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
  284. export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE
  285. export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
  286. export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
  287. export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
  288. export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
  289. # When compiling out-of-tree modules, put MODVERDIR in the module
  290. # tree rather than in the kernel tree. The kernel tree might
  291. # even be read-only.
  292. export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
  293. # Files to ignore in find ... statements
  294. 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
  295. export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
  296. # ===========================================================================
  297. # Rules shared between *config targets and build targets
  298. # Basic helpers built in scripts/
  299. PHONY += scripts_basic
  300. scripts_basic:
  301. $(Q)$(MAKE) $(build)=scripts/basic
  302. # To avoid any implicit rule to kick in, define an empty command.
  303. scripts/basic/%: scripts_basic ;
  304. PHONY += outputmakefile
  305. # outputmakefile generates a Makefile in the output directory, if using a
  306. # separate output directory. This allows convenient use of make in the
  307. # output directory.
  308. outputmakefile:
  309. ifneq ($(KBUILD_SRC),)
  310. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
  311. $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
  312. endif
  313. # To make sure we do not include .config for any of the *config targets
  314. # catch them early, and hand them over to scripts/kconfig/Makefile
  315. # It is allowed to specify more targets when calling make, including
  316. # mixing *config targets and build targets.
  317. # For example 'make oldconfig all'.
  318. # Detect when mixed targets is specified, and make a second invocation
  319. # of make so .config is not included in this case either (for *config).
  320. no-dot-config-targets := clean mrproper distclean \
  321. cscope TAGS tags help %docs check% \
  322. include/linux/version.h headers_% \
  323. kernelrelease kernelversion
  324. config-targets := 0
  325. mixed-targets := 0
  326. dot-config := 1
  327. ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  328. ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  329. dot-config := 0
  330. endif
  331. endif
  332. ifeq ($(KBUILD_EXTMOD),)
  333. ifneq ($(filter config %config,$(MAKECMDGOALS)),)
  334. config-targets := 1
  335. ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
  336. mixed-targets := 1
  337. endif
  338. endif
  339. endif
  340. ifeq ($(mixed-targets),1)
  341. # ===========================================================================
  342. # We're called with mixed targets (*config and build targets).
  343. # Handle them one by one.
  344. %:: FORCE
  345. $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
  346. else
  347. ifeq ($(config-targets),1)
  348. # ===========================================================================
  349. # *config targets only - make sure prerequisites are updated, and descend
  350. # in scripts/kconfig to make the *config target
  351. # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
  352. # KBUILD_DEFCONFIG may point out an alternative default configuration
  353. # used for 'make defconfig'
  354. include $(srctree)/arch/$(SRCARCH)/Makefile
  355. export KBUILD_DEFCONFIG
  356. config %config: scripts_basic outputmakefile FORCE
  357. $(Q)mkdir -p include/linux include/config
  358. $(Q)$(MAKE) $(build)=scripts/kconfig $@
  359. else
  360. # ===========================================================================
  361. # Build targets only - this includes vmlinux, arch specific targets, clean
  362. # targets and others. In general all targets except *config targets.
  363. ifeq ($(KBUILD_EXTMOD),)
  364. # Additional helpers built in scripts/
  365. # Carefully list dependencies so we do not try to build scripts twice
  366. # in parallel
  367. PHONY += scripts
  368. scripts: scripts_basic include/config/auto.conf
  369. $(Q)$(MAKE) $(build)=$(@)
  370. # Objects we will link into vmlinux / subdirs we need to visit
  371. init-y := init/
  372. drivers-y := drivers/ sound/ firmware/
  373. net-y := net/
  374. libs-y := lib/
  375. core-y := usr/
  376. endif # KBUILD_EXTMOD
  377. ifeq ($(dot-config),1)
  378. # Read in config
  379. -include include/config/auto.conf
  380. ifeq ($(KBUILD_EXTMOD),)
  381. # Read in dependencies to all Kconfig* files, make sure to run
  382. # oldconfig if changes are detected.
  383. -include include/config/auto.conf.cmd
  384. # To avoid any implicit rule to kick in, define an empty command
  385. $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
  386. # If .config is newer than include/config/auto.conf, someone tinkered
  387. # with it and forgot to run make oldconfig.
  388. # if auto.conf.cmd is missing then we are probably in a cleaned tree so
  389. # we execute the config step to be sure to catch updated Kconfig files
  390. include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
  391. $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
  392. else
  393. # external modules needs include/linux/autoconf.h and include/config/auto.conf
  394. # but do not care if they are up-to-date. Use auto.conf to trigger the test
  395. PHONY += include/config/auto.conf
  396. include/config/auto.conf:
  397. $(Q)test -e include/linux/autoconf.h -a -e $@ || ( \
  398. echo; \
  399. echo " ERROR: Kernel configuration is invalid."; \
  400. echo " include/linux/autoconf.h or $@ are missing."; \
  401. echo " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
  402. echo; \
  403. /bin/false)
  404. endif # KBUILD_EXTMOD
  405. else
  406. # Dummy target needed, because used as prerequisite
  407. include/config/auto.conf: ;
  408. endif # $(dot-config)
  409. # The all: target is the default when no target is given on the
  410. # command line.
  411. # This allow a user to issue only 'make' to build a kernel including modules
  412. # Defaults vmlinux but it is usually overridden in the arch makefile
  413. all: vmlinux
  414. ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
  415. KBUILD_CFLAGS += -Os
  416. else
  417. KBUILD_CFLAGS += -O2
  418. endif
  419. include $(srctree)/arch/$(SRCARCH)/Makefile
  420. ifneq (CONFIG_FRAME_WARN,0)
  421. KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
  422. endif
  423. # Force gcc to behave correct even for buggy distributions
  424. # Arch Makefiles may override this setting
  425. KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
  426. ifdef CONFIG_FRAME_POINTER
  427. KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
  428. else
  429. KBUILD_CFLAGS += -fomit-frame-pointer
  430. endif
  431. ifdef CONFIG_DEBUG_INFO
  432. KBUILD_CFLAGS += -g
  433. KBUILD_AFLAGS += -gdwarf-2
  434. endif
  435. ifdef CONFIG_FTRACE
  436. KBUILD_CFLAGS += -pg
  437. endif
  438. # We trigger additional mismatches with less inlining
  439. ifdef CONFIG_DEBUG_SECTION_MISMATCH
  440. KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
  441. endif
  442. # arch Makefile may override CC so keep this after arch Makefile is included
  443. NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
  444. CHECKFLAGS += $(NOSTDINC_FLAGS)
  445. # warn about C99 declaration after statement
  446. KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
  447. # disable pointer signed / unsigned warnings in gcc 4.0
  448. KBUILD_CFLAGS += $(call cc-option,-Wno-pointer-sign,)
  449. # Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
  450. # But warn user when we do so
  451. warn-assign = \
  452. $(warning "WARNING: Appending $$K$(1) ($(K$(1))) from $(origin K$(1)) to kernel $$$(1)")
  453. ifneq ($(KCPPFLAGS),)
  454. $(call warn-assign,CPPFLAGS)
  455. KBUILD_CPPFLAGS += $(KCPPFLAGS)
  456. endif
  457. ifneq ($(KAFLAGS),)
  458. $(call warn-assign,AFLAGS)
  459. KBUILD_AFLAGS += $(KAFLAGS)
  460. endif
  461. ifneq ($(KCFLAGS),)
  462. $(call warn-assign,CFLAGS)
  463. KBUILD_CFLAGS += $(KCFLAGS)
  464. endif
  465. # Use --build-id when available.
  466. LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
  467. $(call ld-option, -Wl$(comma)--build-id,))
  468. LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
  469. LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
  470. # Default kernel image to build when no specific target is given.
  471. # KBUILD_IMAGE may be overruled on the command line or
  472. # set in the environment
  473. # Also any assignments in arch/$(ARCH)/Makefile take precedence over
  474. # this default value
  475. export KBUILD_IMAGE ?= vmlinux
  476. #
  477. # INSTALL_PATH specifies where to place the updated kernel and system map
  478. # images. Default is /boot, but you can set it to other values
  479. export INSTALL_PATH ?= /boot
  480. #
  481. # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
  482. # relocations required by build roots. This is not defined in the
  483. # makefile but the argument can be passed to make if needed.
  484. #
  485. MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
  486. export MODLIB
  487. #
  488. # INSTALL_MOD_STRIP, if defined, will cause modules to be
  489. # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
  490. # the default option --strip-debug will be used. Otherwise,
  491. # INSTALL_MOD_STRIP will used as the options to the strip command.
  492. ifdef INSTALL_MOD_STRIP
  493. ifeq ($(INSTALL_MOD_STRIP),1)
  494. mod_strip_cmd = $(STRIP) --strip-debug
  495. else
  496. mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
  497. endif # INSTALL_MOD_STRIP=1
  498. else
  499. mod_strip_cmd = true
  500. endif # INSTALL_MOD_STRIP
  501. export mod_strip_cmd
  502. ifeq ($(KBUILD_EXTMOD),)
  503. core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
  504. vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
  505. $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
  506. $(net-y) $(net-m) $(libs-y) $(libs-m)))
  507. vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
  508. $(init-n) $(init-) \
  509. $(core-n) $(core-) $(drivers-n) $(drivers-) \
  510. $(net-n) $(net-) $(libs-n) $(libs-))))
  511. init-y := $(patsubst %/, %/built-in.o, $(init-y))
  512. core-y := $(patsubst %/, %/built-in.o, $(core-y))
  513. drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
  514. net-y := $(patsubst %/, %/built-in.o, $(net-y))
  515. libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
  516. libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
  517. libs-y := $(libs-y1) $(libs-y2)
  518. # Build vmlinux
  519. # ---------------------------------------------------------------------------
  520. # vmlinux is built from the objects selected by $(vmlinux-init) and
  521. # $(vmlinux-main). Most are built-in.o files from top-level directories
  522. # in the kernel tree, others are specified in arch/$(ARCH)/Makefile.
  523. # Ordering when linking is important, and $(vmlinux-init) must be first.
  524. #
  525. # vmlinux
  526. # ^
  527. # |
  528. # +-< $(vmlinux-init)
  529. # | +--< init/version.o + more
  530. # |
  531. # +--< $(vmlinux-main)
  532. # | +--< driver/built-in.o mm/built-in.o + more
  533. # |
  534. # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
  535. #
  536. # vmlinux version (uname -v) cannot be updated during normal
  537. # descending-into-subdirs phase since we do not yet know if we need to
  538. # update vmlinux.
  539. # Therefore this step is delayed until just before final link of vmlinux -
  540. # except in the kallsyms case where it is done just before adding the
  541. # symbols to the kernel.
  542. #
  543. # System.map is generated to document addresses of all kernel symbols
  544. vmlinux-init := $(head-y) $(init-y)
  545. vmlinux-main := $(core-y) $(libs-y) $(drivers-y) $(net-y)
  546. vmlinux-all := $(vmlinux-init) $(vmlinux-main)
  547. vmlinux-lds := arch/$(SRCARCH)/kernel/vmlinux.lds
  548. export KBUILD_VMLINUX_OBJS := $(vmlinux-all)
  549. # Rule to link vmlinux - also used during CONFIG_KALLSYMS
  550. # May be overridden by arch/$(ARCH)/Makefile
  551. quiet_cmd_vmlinux__ ?= LD $@
  552. cmd_vmlinux__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) -o $@ \
  553. -T $(vmlinux-lds) $(vmlinux-init) \
  554. --start-group $(vmlinux-main) --end-group \
  555. $(filter-out $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o FORCE ,$^)
  556. # Generate new vmlinux version
  557. quiet_cmd_vmlinux_version = GEN .version
  558. cmd_vmlinux_version = set -e; \
  559. if [ ! -r .version ]; then \
  560. rm -f .version; \
  561. echo 1 >.version; \
  562. else \
  563. mv .version .old_version; \
  564. expr 0$$(cat .old_version) + 1 >.version; \
  565. fi; \
  566. $(MAKE) $(build)=init
  567. # Generate System.map
  568. quiet_cmd_sysmap = SYSMAP
  569. cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
  570. # Link of vmlinux
  571. # If CONFIG_KALLSYMS is set .version is already updated
  572. # Generate System.map and verify that the content is consistent
  573. # Use + in front of the vmlinux_version rule to silent warning with make -j2
  574. # First command is ':' to allow us to use + in front of the rule
  575. define rule_vmlinux__
  576. :
  577. $(if $(CONFIG_KALLSYMS),,+$(call cmd,vmlinux_version))
  578. $(call cmd,vmlinux__)
  579. $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
  580. $(Q)$(if $($(quiet)cmd_sysmap), \
  581. echo ' $($(quiet)cmd_sysmap) System.map' &&) \
  582. $(cmd_sysmap) $@ System.map; \
  583. if [ $$? -ne 0 ]; then \
  584. rm -f $@; \
  585. /bin/false; \
  586. fi;
  587. $(verify_kallsyms)
  588. endef
  589. ifdef CONFIG_KALLSYMS
  590. # Generate section listing all symbols and add it into vmlinux $(kallsyms.o)
  591. # It's a three stage process:
  592. # o .tmp_vmlinux1 has all symbols and sections, but __kallsyms is
  593. # empty
  594. # Running kallsyms on that gives us .tmp_kallsyms1.o with
  595. # the right size - vmlinux version (uname -v) is updated during this step
  596. # o .tmp_vmlinux2 now has a __kallsyms section of the right size,
  597. # but due to the added section, some addresses have shifted.
  598. # From here, we generate a correct .tmp_kallsyms2.o
  599. # o The correct .tmp_kallsyms2.o is linked into the final vmlinux.
  600. # o Verify that the System.map from vmlinux matches the map from
  601. # .tmp_vmlinux2, just in case we did not generate kallsyms correctly.
  602. # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
  603. # .tmp_vmlinux3 and .tmp_kallsyms3.o. This is only meant as a
  604. # temporary bypass to allow the kernel to be built while the
  605. # maintainers work out what went wrong with kallsyms.
  606. ifdef CONFIG_KALLSYMS_EXTRA_PASS
  607. last_kallsyms := 3
  608. else
  609. last_kallsyms := 2
  610. endif
  611. kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
  612. define verify_kallsyms
  613. $(Q)$(if $($(quiet)cmd_sysmap), \
  614. echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
  615. $(cmd_sysmap) .tmp_vmlinux$(last_kallsyms) .tmp_System.map
  616. $(Q)cmp -s System.map .tmp_System.map || \
  617. (echo Inconsistent kallsyms data; \
  618. echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
  619. rm .tmp_kallsyms* ; /bin/false )
  620. endef
  621. # Update vmlinux version before link
  622. # Use + in front of this rule to silent warning about make -j1
  623. # First command is ':' to allow us to use + in front of this rule
  624. cmd_ksym_ld = $(cmd_vmlinux__)
  625. define rule_ksym_ld
  626. :
  627. +$(call cmd,vmlinux_version)
  628. $(call cmd,vmlinux__)
  629. $(Q)echo 'cmd_$@ := $(cmd_vmlinux__)' > $(@D)/.$(@F).cmd
  630. endef
  631. # Generate .S file with all kernel symbols
  632. quiet_cmd_kallsyms = KSYM $@
  633. cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
  634. $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
  635. .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
  636. $(call if_changed_dep,as_o_S)
  637. .tmp_kallsyms%.S: .tmp_vmlinux% $(KALLSYMS)
  638. $(call cmd,kallsyms)
  639. # .tmp_vmlinux1 must be complete except kallsyms, so update vmlinux version
  640. .tmp_vmlinux1: $(vmlinux-lds) $(vmlinux-all) FORCE
  641. $(call if_changed_rule,ksym_ld)
  642. .tmp_vmlinux2: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms1.o FORCE
  643. $(call if_changed,vmlinux__)
  644. .tmp_vmlinux3: $(vmlinux-lds) $(vmlinux-all) .tmp_kallsyms2.o FORCE
  645. $(call if_changed,vmlinux__)
  646. # Needs to visit scripts/ before $(KALLSYMS) can be used.
  647. $(KALLSYMS): scripts ;
  648. # Generate some data for debugging strange kallsyms problems
  649. debug_kallsyms: .tmp_map$(last_kallsyms)
  650. .tmp_map%: .tmp_vmlinux% FORCE
  651. ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
  652. .tmp_map3: .tmp_map2
  653. .tmp_map2: .tmp_map1
  654. endif # ifdef CONFIG_KALLSYMS
  655. # Do modpost on a prelinked vmlinux. The finally linked vmlinux has
  656. # relevant sections renamed as per the linker script.
  657. quiet_cmd_vmlinux-modpost = LD $@
  658. cmd_vmlinux-modpost = $(LD) $(LDFLAGS) -r -o $@ \
  659. $(vmlinux-init) --start-group $(vmlinux-main) --end-group \
  660. $(filter-out $(vmlinux-init) $(vmlinux-main) FORCE ,$^)
  661. define rule_vmlinux-modpost
  662. :
  663. +$(call cmd,vmlinux-modpost)
  664. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@
  665. $(Q)echo 'cmd_$@ := $(cmd_vmlinux-modpost)' > $(dot-target).cmd
  666. endef
  667. # vmlinux image - including updated kernel symbols
  668. vmlinux: $(vmlinux-lds) $(vmlinux-init) $(vmlinux-main) vmlinux.o $(kallsyms.o) FORCE
  669. ifdef CONFIG_HEADERS_CHECK
  670. $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
  671. endif
  672. ifdef CONFIG_SAMPLES
  673. $(Q)$(MAKE) $(build)=samples
  674. endif
  675. $(call vmlinux-modpost)
  676. $(call if_changed_rule,vmlinux__)
  677. $(Q)rm -f .old_version
  678. # build vmlinux.o first to catch section mismatch errors early
  679. ifdef CONFIG_KALLSYMS
  680. .tmp_vmlinux1: vmlinux.o
  681. endif
  682. modpost-init := $(filter-out init/built-in.o, $(vmlinux-init))
  683. vmlinux.o: $(modpost-init) $(vmlinux-main) FORCE
  684. $(call if_changed_rule,vmlinux-modpost)
  685. # The actual objects are generated when descending,
  686. # make sure no implicit rule kicks in
  687. $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
  688. # Handle descending into subdirectories listed in $(vmlinux-dirs)
  689. # Preset locale variables to speed up the build process. Limit locale
  690. # tweaks to this spot to avoid wrong language settings when running
  691. # make menuconfig etc.
  692. # Error messages still appears in the original language
  693. PHONY += $(vmlinux-dirs)
  694. $(vmlinux-dirs): prepare scripts
  695. $(Q)$(MAKE) $(build)=$@
  696. # Build the kernel release string
  697. #
  698. # The KERNELRELEASE value built here is stored in the file
  699. # include/config/kernel.release, and is used when executing several
  700. # make targets, such as "make install" or "make modules_install."
  701. #
  702. # The eventual kernel release string consists of the following fields,
  703. # shown in a hierarchical format to show how smaller parts are concatenated
  704. # to form the larger and final value, with values coming from places like
  705. # the Makefile, kernel config options, make command line options and/or
  706. # SCM tag information.
  707. #
  708. # $(KERNELVERSION)
  709. # $(VERSION) eg, 2
  710. # $(PATCHLEVEL) eg, 6
  711. # $(SUBLEVEL) eg, 18
  712. # $(EXTRAVERSION) eg, -rc6
  713. # $(localver-full)
  714. # $(localver)
  715. # localversion* (files without backups, containing '~')
  716. # $(CONFIG_LOCALVERSION) (from kernel config setting)
  717. # $(localver-auto) (only if CONFIG_LOCALVERSION_AUTO is set)
  718. # ./scripts/setlocalversion (SCM tag, if one exists)
  719. # $(LOCALVERSION) (from make command line if provided)
  720. #
  721. # Note how the final $(localver-auto) string is included *only* if the
  722. # kernel config option CONFIG_LOCALVERSION_AUTO is selected. Also, at the
  723. # moment, only git is supported but other SCMs can edit the script
  724. # scripts/setlocalversion and add the appropriate checks as needed.
  725. pattern = ".*/localversion[^~]*"
  726. string = $(shell cat /dev/null \
  727. `find $(objtree) $(srctree) -maxdepth 1 -regex $(pattern) | sort -u`)
  728. localver = $(subst $(space),, $(string) \
  729. $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
  730. # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
  731. # and if the SCM is know a tag from the SCM is appended.
  732. # The appended tag is determined by the SCM used.
  733. #
  734. # Currently, only git is supported.
  735. # Other SCMs can edit scripts/setlocalversion and add the appropriate
  736. # checks as needed.
  737. ifdef CONFIG_LOCALVERSION_AUTO
  738. _localver-auto = $(shell $(CONFIG_SHELL) \
  739. $(srctree)/scripts/setlocalversion $(srctree))
  740. localver-auto = $(LOCALVERSION)$(_localver-auto)
  741. endif
  742. localver-full = $(localver)$(localver-auto)
  743. # Store (new) KERNELRELASE string in include/config/kernel.release
  744. kernelrelease = $(KERNELVERSION)$(localver-full)
  745. include/config/kernel.release: include/config/auto.conf FORCE
  746. $(Q)rm -f $@
  747. $(Q)echo $(kernelrelease) > $@
  748. # Things we need to do before we recursively start building the kernel
  749. # or the modules are listed in "prepare".
  750. # A multi level approach is used. prepareN is processed before prepareN-1.
  751. # archprepare is used in arch Makefiles and when processed asm symlink,
  752. # version.h and scripts_basic is processed / created.
  753. # Listed in dependency order
  754. PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
  755. # prepare3 is used to check if we are building in a separate output directory,
  756. # and if so do:
  757. # 1) Check that make has not been executed in the kernel src $(srctree)
  758. # 2) Create the include2 directory, used for the second asm symlink
  759. prepare3: include/config/kernel.release
  760. ifneq ($(KBUILD_SRC),)
  761. @echo ' Using $(srctree) as source for kernel'
  762. $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
  763. echo " $(srctree) is not clean, please run 'make mrproper'";\
  764. echo " in the '$(srctree)' directory.";\
  765. /bin/false; \
  766. fi;
  767. $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
  768. $(Q)ln -fsn $(srctree)/include/asm-$(SRCARCH) include2/asm
  769. endif
  770. # prepare2 creates a makefile if using a separate output directory
  771. prepare2: prepare3 outputmakefile
  772. prepare1: prepare2 include/linux/version.h include/linux/utsrelease.h \
  773. include/asm include/config/auto.conf
  774. $(cmd_crmodverdir)
  775. archprepare: prepare1 scripts_basic
  776. prepare0: archprepare FORCE
  777. $(Q)$(MAKE) $(build)=.
  778. $(Q)$(MAKE) $(build)=. missing-syscalls
  779. # All the preparing..
  780. prepare: prepare0
  781. # Leave this as default for preprocessing vmlinux.lds.S, which is now
  782. # done in arch/$(ARCH)/kernel/Makefile
  783. export CPPFLAGS_vmlinux.lds += -P -C -U$(ARCH)
  784. # The asm symlink changes when $(ARCH) changes.
  785. # Detect this and ask user to run make mrproper
  786. include/asm: FORCE
  787. $(Q)set -e; asmlink=`readlink include/asm | cut -d '-' -f 2`; \
  788. if [ -L include/asm ]; then \
  789. if [ "$$asmlink" != "$(SRCARCH)" ]; then \
  790. echo "ERROR: the symlink $@ points to asm-$$asmlink but asm-$(SRCARCH) was expected"; \
  791. echo " set ARCH or save .config and run 'make mrproper' to fix it"; \
  792. exit 1; \
  793. fi; \
  794. else \
  795. echo ' SYMLINK $@ -> include/asm-$(SRCARCH)'; \
  796. if [ ! -d include ]; then \
  797. mkdir -p include; \
  798. fi; \
  799. ln -fsn asm-$(SRCARCH) $@; \
  800. fi
  801. # Generate some files
  802. # ---------------------------------------------------------------------------
  803. # KERNELRELEASE can change from a few different places, meaning version.h
  804. # needs to be updated, so this check is forced on all builds
  805. uts_len := 64
  806. define filechk_utsrelease.h
  807. if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
  808. echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
  809. exit 1; \
  810. fi; \
  811. (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
  812. endef
  813. define filechk_version.h
  814. (echo \#define LINUX_VERSION_CODE $(shell \
  815. expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
  816. echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
  817. endef
  818. include/linux/version.h: $(srctree)/Makefile FORCE
  819. $(call filechk,version.h)
  820. include/linux/utsrelease.h: include/config/kernel.release FORCE
  821. $(call filechk,utsrelease.h)
  822. # ---------------------------------------------------------------------------
  823. PHONY += depend dep
  824. depend dep:
  825. @echo '*** Warning: make $@ is unnecessary now.'
  826. # ---------------------------------------------------------------------------
  827. # Firmware install
  828. INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
  829. export INSTALL_FW_PATH
  830. PHONY += firmware_install
  831. firmware_install: FORCE
  832. @mkdir -p $(objtree)/firmware
  833. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
  834. # ---------------------------------------------------------------------------
  835. # Kernel headers
  836. INSTALL_HDR_PATH=$(objtree)/usr
  837. export INSTALL_HDR_PATH
  838. HDRFILTER=generic i386 x86_64
  839. HDRARCHES=$(filter-out $(HDRFILTER),$(patsubst $(srctree)/include/asm-%/Kbuild,%,$(wildcard $(srctree)/include/asm-*/Kbuild)))
  840. PHONY += headers_install_all
  841. headers_install_all: include/linux/version.h scripts_basic FORCE
  842. $(Q)$(MAKE) $(build)=scripts scripts/unifdef
  843. $(Q)for arch in $(HDRARCHES); do \
  844. $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch ;\
  845. done
  846. PHONY += headers_install
  847. headers_install: include/linux/version.h scripts_basic FORCE
  848. @if [ ! -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
  849. echo '*** Error: Headers not exportable for this architecture ($(SRCARCH))'; \
  850. exit 1 ; fi
  851. $(Q)$(MAKE) $(build)=scripts scripts/unifdef
  852. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include
  853. PHONY += headers_check_all
  854. headers_check_all: headers_install_all
  855. $(Q)for arch in $(HDRARCHES); do \
  856. $(MAKE) ARCH=$$arch -f $(srctree)/scripts/Makefile.headersinst obj=include BIASMDIR=-bi-$$arch HDRCHECK=1 ;\
  857. done
  858. PHONY += headers_check
  859. headers_check: headers_install
  860. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.headersinst ARCH=$(SRCARCH) obj=include HDRCHECK=1
  861. # ---------------------------------------------------------------------------
  862. # Modules
  863. ifdef CONFIG_MODULES
  864. # By default, build modules as well
  865. all: modules
  866. # Build modules
  867. #
  868. # A module can be listed more than once in obj-m resulting in
  869. # duplicate lines in modules.order files. Those are removed
  870. # using awk while concatenating to the final file.
  871. PHONY += modules
  872. modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
  873. $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
  874. @echo ' Building modules, stage 2.';
  875. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  876. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
  877. # Target to prepare building external modules
  878. PHONY += modules_prepare
  879. modules_prepare: prepare scripts
  880. # Target to install modules
  881. PHONY += modules_install
  882. modules_install: _modinst_ _modinst_post
  883. PHONY += _modinst_
  884. _modinst_:
  885. @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
  886. echo "Warning: you may need to install module-init-tools"; \
  887. echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
  888. sleep 1; \
  889. fi
  890. @rm -rf $(MODLIB)/kernel
  891. @rm -f $(MODLIB)/source
  892. @mkdir -p $(MODLIB)/kernel
  893. @ln -s $(srctree) $(MODLIB)/source
  894. @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
  895. rm -f $(MODLIB)/build ; \
  896. ln -s $(objtree) $(MODLIB)/build ; \
  897. fi
  898. @cp -f $(objtree)/modules.order $(MODLIB)/
  899. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  900. # This depmod is only for convenience to give the initial
  901. # boot a modules.dep even before / is mounted read-write. However the
  902. # boot script depmod is the master version.
  903. PHONY += _modinst_post
  904. _modinst_post: _modinst_
  905. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
  906. $(call cmd,depmod)
  907. else # CONFIG_MODULES
  908. # Modules not configured
  909. # ---------------------------------------------------------------------------
  910. modules modules_install: FORCE
  911. @echo
  912. @echo "The present kernel configuration has modules disabled."
  913. @echo "Type 'make config' and enable loadable module support."
  914. @echo "Then build a kernel with module support enabled."
  915. @echo
  916. @exit 1
  917. endif # CONFIG_MODULES
  918. ###
  919. # Cleaning is done on three levels.
  920. # make clean Delete most generated files
  921. # Leave enough to build external modules
  922. # make mrproper Delete the current configuration, and all generated files
  923. # make distclean Remove editor backup files, patch leftover files and the like
  924. # Directories & files removed with 'make clean'
  925. CLEAN_DIRS += $(MODVERDIR)
  926. CLEAN_FILES += vmlinux System.map \
  927. .tmp_kallsyms* .tmp_version .tmp_vmlinux* .tmp_System.map
  928. # Directories & files removed with 'make mrproper'
  929. MRPROPER_DIRS += include/config include2 usr/include
  930. MRPROPER_FILES += .config .config.old include/asm .version .old_version \
  931. include/linux/autoconf.h include/linux/version.h \
  932. include/linux/utsrelease.h \
  933. include/linux/bounds.h include/asm*/asm-offsets.h \
  934. Module.symvers tags TAGS cscope*
  935. # clean - Delete most, but leave enough to build external modules
  936. #
  937. clean: rm-dirs := $(CLEAN_DIRS)
  938. clean: rm-files := $(CLEAN_FILES)
  939. clean-dirs := $(addprefix _clean_,$(srctree) $(vmlinux-alldirs))
  940. PHONY += $(clean-dirs) clean archclean
  941. $(clean-dirs):
  942. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  943. clean: archclean $(clean-dirs)
  944. $(call cmd,rmdirs)
  945. $(call cmd,rmfiles)
  946. @find . $(RCS_FIND_IGNORE) \
  947. \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
  948. -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
  949. -o -name '*.symtypes' -o -name 'modules.order' \
  950. -o -name 'Module.markers' \) \
  951. -type f -print | xargs rm -f
  952. # mrproper - Delete all generated files, including .config
  953. #
  954. mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
  955. mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
  956. mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
  957. PHONY += $(mrproper-dirs) mrproper archmrproper
  958. $(mrproper-dirs):
  959. $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
  960. mrproper: clean archmrproper $(mrproper-dirs)
  961. $(call cmd,rmdirs)
  962. $(call cmd,rmfiles)
  963. # distclean
  964. #
  965. PHONY += distclean
  966. distclean: mrproper
  967. @find $(srctree) $(RCS_FIND_IGNORE) \
  968. \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
  969. -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
  970. -o -name '.*.rej' -o -size 0 \
  971. -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
  972. -type f -print | xargs rm -f
  973. # Packaging of the kernel to various formats
  974. # ---------------------------------------------------------------------------
  975. # rpm target kept for backward compatibility
  976. package-dir := $(srctree)/scripts/package
  977. %pkg: include/config/kernel.release FORCE
  978. $(Q)$(MAKE) $(build)=$(package-dir) $@
  979. rpm: include/config/kernel.release FORCE
  980. $(Q)$(MAKE) $(build)=$(package-dir) $@
  981. # Brief documentation of the typical targets used
  982. # ---------------------------------------------------------------------------
  983. boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
  984. boards := $(notdir $(boards))
  985. board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
  986. board-dirs := $(sort $(notdir $(board-dirs:/=)))
  987. help:
  988. @echo 'Cleaning targets:'
  989. @echo ' clean - Remove most generated files but keep the config and'
  990. @echo ' enough build support to build external modules'
  991. @echo ' mrproper - Remove all generated files + config + various backup files'
  992. @echo ' distclean - mrproper + remove editor backup and patch files'
  993. @echo ''
  994. @echo 'Configuration targets:'
  995. @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
  996. @echo ''
  997. @echo 'Other generic targets:'
  998. @echo ' all - Build all targets marked with [*]'
  999. @echo '* vmlinux - Build the bare kernel'
  1000. @echo '* modules - Build all modules'
  1001. @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
  1002. @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
  1003. @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
  1004. @echo ' dir/ - Build all files in dir and below'
  1005. @echo ' dir/file.[ois] - Build specified target only'
  1006. @echo ' dir/file.ko - Build module including final link'
  1007. @echo ' prepare - Set up for building external modules'
  1008. @echo ' tags/TAGS - Generate tags file for editors'
  1009. @echo ' cscope - Generate cscope index'
  1010. @echo ' kernelrelease - Output the release version string'
  1011. @echo ' kernelversion - Output the version stored in Makefile'
  1012. @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
  1013. echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
  1014. echo ' (default: $(INSTALL_HDR_PATH))'; \
  1015. fi
  1016. @echo ''
  1017. @echo 'Static analysers'
  1018. @echo ' checkstack - Generate a list of stack hogs'
  1019. @echo ' namespacecheck - Name space analysis on compiled kernel'
  1020. @echo ' versioncheck - Sanity check on version.h usage'
  1021. @echo ' includecheck - Check for duplicate included header files'
  1022. @echo ' export_report - List the usages of all exported symbols'
  1023. @if [ -r $(srctree)/include/asm-$(SRCARCH)/Kbuild ]; then \
  1024. echo ' headers_check - Sanity check on exported headers'; \
  1025. fi
  1026. @echo ''
  1027. @echo 'Kernel packaging:'
  1028. @$(MAKE) $(build)=$(package-dir) help
  1029. @echo ''
  1030. @echo 'Documentation targets:'
  1031. @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
  1032. @echo ''
  1033. @echo 'Architecture specific targets ($(SRCARCH)):'
  1034. @$(if $(archhelp),$(archhelp),\
  1035. echo ' No architecture specific help defined for $(SRCARCH)')
  1036. @echo ''
  1037. @$(if $(boards), \
  1038. $(foreach b, $(boards), \
  1039. printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
  1040. echo '')
  1041. @$(if $(board-dirs), \
  1042. $(foreach b, $(board-dirs), \
  1043. printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
  1044. printf " %-16s - Show all of the above\\n" help-boards; \
  1045. echo '')
  1046. @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
  1047. @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
  1048. @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
  1049. @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
  1050. @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
  1051. @echo ''
  1052. @echo 'Execute "make" or "make all" to build all targets marked with [*] '
  1053. @echo 'For further info see the ./README file'
  1054. help-board-dirs := $(addprefix help-,$(board-dirs))
  1055. help-boards: $(help-board-dirs)
  1056. boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
  1057. $(help-board-dirs): help-%:
  1058. @echo 'Architecture specific targets ($(SRCARCH) $*):'
  1059. @$(if $(boards-per-dir), \
  1060. $(foreach b, $(boards-per-dir), \
  1061. printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
  1062. echo '')
  1063. # Documentation targets
  1064. # ---------------------------------------------------------------------------
  1065. %docs: scripts_basic FORCE
  1066. $(Q)$(MAKE) $(build)=Documentation/DocBook $@
  1067. else # KBUILD_EXTMOD
  1068. ###
  1069. # External module support.
  1070. # When building external modules the kernel used as basis is considered
  1071. # read-only, and no consistency checks are made and the make
  1072. # system is not used on the basis kernel. If updates are required
  1073. # in the basis kernel ordinary make commands (without M=...) must
  1074. # be used.
  1075. #
  1076. # The following are the only valid targets when building external
  1077. # modules.
  1078. # make M=dir clean Delete all automatically generated files
  1079. # make M=dir modules Make all modules in specified dir
  1080. # make M=dir Same as 'make M=dir modules'
  1081. # make M=dir modules_install
  1082. # Install the modules built in the module directory
  1083. # Assumes install directory is already created
  1084. # We are always building modules
  1085. KBUILD_MODULES := 1
  1086. PHONY += crmodverdir
  1087. crmodverdir:
  1088. $(cmd_crmodverdir)
  1089. PHONY += $(objtree)/Module.symvers
  1090. $(objtree)/Module.symvers:
  1091. @test -e $(objtree)/Module.symvers || ( \
  1092. echo; \
  1093. echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
  1094. echo " is missing; modules will have no dependencies and modversions."; \
  1095. echo )
  1096. module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
  1097. PHONY += $(module-dirs) modules
  1098. $(module-dirs): crmodverdir $(objtree)/Module.symvers
  1099. $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
  1100. modules: $(module-dirs)
  1101. @echo ' Building modules, stage 2.';
  1102. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  1103. PHONY += modules_install
  1104. modules_install: _emodinst_ _emodinst_post
  1105. install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
  1106. PHONY += _emodinst_
  1107. _emodinst_:
  1108. $(Q)mkdir -p $(MODLIB)/$(install-dir)
  1109. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  1110. PHONY += _emodinst_post
  1111. _emodinst_post: _emodinst_
  1112. $(call cmd,depmod)
  1113. clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
  1114. PHONY += $(clean-dirs) clean
  1115. $(clean-dirs):
  1116. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  1117. clean: rm-dirs := $(MODVERDIR)
  1118. clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
  1119. clean: $(clean-dirs)
  1120. $(call cmd,rmdirs)
  1121. $(call cmd,rmfiles)
  1122. @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
  1123. \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
  1124. -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
  1125. -type f -print | xargs rm -f
  1126. help:
  1127. @echo ' Building external modules.'
  1128. @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
  1129. @echo ''
  1130. @echo ' modules - default target, build the module(s)'
  1131. @echo ' modules_install - install the module'
  1132. @echo ' clean - remove generated files in module directory only'
  1133. @echo ''
  1134. # Dummies...
  1135. PHONY += prepare scripts
  1136. prepare: ;
  1137. scripts: ;
  1138. endif # KBUILD_EXTMOD
  1139. # Generate tags for editors
  1140. # ---------------------------------------------------------------------------
  1141. #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
  1142. #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
  1143. #Adding $(srctree) adds about 20M on i386 to the size of the output file!
  1144. ifeq ($(src),$(obj))
  1145. __srctree =
  1146. else
  1147. __srctree = $(srctree)/
  1148. endif
  1149. ifeq ($(ALLSOURCE_ARCHS),)
  1150. ifeq ($(ARCH),um)
  1151. ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
  1152. else
  1153. ALLINCLUDE_ARCHS := $(SRCARCH)
  1154. endif
  1155. else
  1156. #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
  1157. ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
  1158. endif
  1159. ALLSOURCE_ARCHS := $(SRCARCH)
  1160. define find-sources
  1161. ( for arch in $(ALLSOURCE_ARCHS) ; do \
  1162. find $(__srctree)arch/$${arch} $(RCS_FIND_IGNORE) \
  1163. -name $1 -print; \
  1164. done ; \
  1165. find $(__srctree)security/selinux/include $(RCS_FIND_IGNORE) \
  1166. -name $1 -print; \
  1167. find $(__srctree)include $(RCS_FIND_IGNORE) \
  1168. \( -name config -o -name 'asm-*' \) -prune \
  1169. -o -name $1 -print; \
  1170. for arch in $(ALLINCLUDE_ARCHS) ; do \
  1171. find $(__srctree)include/asm-$${arch} $(RCS_FIND_IGNORE) \
  1172. -name $1 -print; \
  1173. done ; \
  1174. find $(__srctree)include/asm-generic $(RCS_FIND_IGNORE) \
  1175. -name $1 -print; \
  1176. find $(__srctree) $(RCS_FIND_IGNORE) \
  1177. \( -name include -o -name arch -o -name '.tmp_*' \) -prune -o \
  1178. -name $1 -print; \
  1179. )
  1180. endef
  1181. define all-sources
  1182. $(call find-sources,'*.[chS]')
  1183. endef
  1184. define all-kconfigs
  1185. $(call find-sources,'Kconfig*')
  1186. endef
  1187. define all-defconfigs
  1188. $(call find-sources,'defconfig')
  1189. endef
  1190. define xtags
  1191. if $1 --version 2>&1 | grep -iq exuberant; then \
  1192. $(all-sources) | xargs $1 -a \
  1193. -I __initdata,__exitdata,__acquires,__releases \
  1194. -I __read_mostly,____cacheline_aligned,____cacheline_aligned_in_smp,____cacheline_internodealigned_in_smp \
  1195. -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
  1196. --extra=+f --c-kinds=+px \
  1197. --regex-asm='/^ENTRY\(([^)]*)\).*/\1/'; \
  1198. $(all-kconfigs) | xargs $1 -a \
  1199. --langdef=kconfig \
  1200. --language-force=kconfig \
  1201. --regex-kconfig='/^[[:blank:]]*(menu|)config[[:blank:]]+([[:alnum:]_]+)/\2/'; \
  1202. $(all-defconfigs) | xargs -r $1 -a \
  1203. --langdef=dotconfig \
  1204. --language-force=dotconfig \
  1205. --regex-dotconfig='/^#?[[:blank:]]*(CONFIG_[[:alnum:]_]+)/\1/'; \
  1206. elif $1 --version 2>&1 | grep -iq emacs; then \
  1207. $(all-sources) | xargs $1 -a; \
  1208. $(all-kconfigs) | xargs $1 -a \
  1209. --regex='/^[ \t]*\(\(menu\)*config\)[ \t]+\([a-zA-Z0-9_]+\)/\3/'; \
  1210. $(all-defconfigs) | xargs -r $1 -a \
  1211. --regex='/^#?[ \t]?\(CONFIG_[a-zA-Z0-9_]+\)/\1/'; \
  1212. else \
  1213. $(all-sources) | xargs $1 -a; \
  1214. fi
  1215. endef
  1216. quiet_cmd_cscope-file = FILELST cscope.files
  1217. cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
  1218. quiet_cmd_cscope = MAKE cscope.out
  1219. cmd_cscope = cscope -b
  1220. cscope: FORCE
  1221. $(call cmd,cscope-file)
  1222. $(call cmd,cscope)
  1223. quiet_cmd_TAGS = MAKE $@
  1224. define cmd_TAGS
  1225. rm -f $@; \
  1226. $(call xtags,etags)
  1227. endef
  1228. TAGS: FORCE
  1229. $(call cmd,TAGS)
  1230. quiet_cmd_tags = MAKE $@
  1231. define cmd_tags
  1232. rm -f $@; \
  1233. $(call xtags,ctags)
  1234. endef
  1235. tags: FORCE
  1236. $(call cmd,tags)
  1237. # Scripts to check various things for consistency
  1238. # ---------------------------------------------------------------------------
  1239. includecheck:
  1240. find * $(RCS_FIND_IGNORE) \
  1241. -name '*.[hcS]' -type f -print | sort \
  1242. | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
  1243. versioncheck:
  1244. find * $(RCS_FIND_IGNORE) \
  1245. -name '*.[hcS]' -type f -print | sort \
  1246. | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
  1247. namespacecheck:
  1248. $(PERL) $(srctree)/scripts/namespace.pl
  1249. export_report:
  1250. $(PERL) $(srctree)/scripts/export_report.pl
  1251. endif #ifeq ($(config-targets),1)
  1252. endif #ifeq ($(mixed-targets),1)
  1253. PHONY += checkstack kernelrelease kernelversion
  1254. # UML needs a little special treatment here. It wants to use the host
  1255. # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
  1256. # else wants $(ARCH), including people doing cross-builds, which means
  1257. # that $(SUBARCH) doesn't work here.
  1258. ifeq ($(ARCH), um)
  1259. CHECKSTACK_ARCH := $(SUBARCH)
  1260. else
  1261. CHECKSTACK_ARCH := $(ARCH)
  1262. endif
  1263. checkstack:
  1264. $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
  1265. $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
  1266. kernelrelease:
  1267. $(if $(wildcard include/config/kernel.release), $(Q)echo $(KERNELRELEASE), \
  1268. $(error kernelrelease not valid - run 'make prepare' to update it))
  1269. kernelversion:
  1270. @echo $(KERNELVERSION)
  1271. # Single targets
  1272. # ---------------------------------------------------------------------------
  1273. # Single targets are compatible with:
  1274. # - build with mixed source and output
  1275. # - build with separate output dir 'make O=...'
  1276. # - external modules
  1277. #
  1278. # target-dir => where to store outputfile
  1279. # build-dir => directory in kernel source tree to use
  1280. ifeq ($(KBUILD_EXTMOD),)
  1281. build-dir = $(patsubst %/,%,$(dir $@))
  1282. target-dir = $(dir $@)
  1283. else
  1284. zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
  1285. build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
  1286. target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
  1287. endif
  1288. %.s: %.c prepare scripts FORCE
  1289. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1290. %.i: %.c prepare scripts FORCE
  1291. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1292. %.o: %.c prepare scripts FORCE
  1293. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1294. %.lst: %.c prepare scripts FORCE
  1295. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1296. %.s: %.S prepare scripts FORCE
  1297. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1298. %.o: %.S prepare scripts FORCE
  1299. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1300. %.symtypes: %.c prepare scripts FORCE
  1301. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1302. # Modules
  1303. / %/: prepare scripts FORCE
  1304. $(cmd_crmodverdir)
  1305. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1306. $(build)=$(build-dir)
  1307. %.ko: prepare scripts FORCE
  1308. $(cmd_crmodverdir)
  1309. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1310. $(build)=$(build-dir) $(@:.ko=.o)
  1311. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  1312. # FIXME Should go into a make.lib or something
  1313. # ===========================================================================
  1314. quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
  1315. cmd_rmdirs = rm -rf $(rm-dirs)
  1316. quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
  1317. cmd_rmfiles = rm -f $(rm-files)
  1318. # Run depmod only if we have System.map and depmod is executable
  1319. quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
  1320. cmd_depmod = \
  1321. if [ -r System.map -a -x $(DEPMOD) ]; then \
  1322. $(DEPMOD) -ae -F System.map \
  1323. $(if $(strip $(INSTALL_MOD_PATH)), -b $(INSTALL_MOD_PATH) -r) \
  1324. $(KERNELRELEASE); \
  1325. fi
  1326. # Create temporary dir for module support files
  1327. # clean it up only when building all modules
  1328. cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
  1329. $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
  1330. a_flags = -Wp,-MD,$(depfile) $(KBUILD_AFLAGS) $(AFLAGS_KERNEL) \
  1331. $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
  1332. $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o)
  1333. quiet_cmd_as_o_S = AS $@
  1334. cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
  1335. # read all saved command lines
  1336. targets := $(wildcard $(sort $(targets)))
  1337. cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
  1338. ifneq ($(cmd_files),)
  1339. $(cmd_files): ; # Do not try to update included dependency files
  1340. include $(cmd_files)
  1341. endif
  1342. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
  1343. # Usage:
  1344. # $(Q)$(MAKE) $(clean)=dir
  1345. clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
  1346. endif # skip-makefile
  1347. PHONY += FORCE
  1348. FORCE:
  1349. # Declare the contents of the .PHONY variable as phony. We keep that
  1350. # information in a variable se we can use it in if_changed and friends.
  1351. .PHONY: $(PHONY)