Makefile 42 KB

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  1. VERSION = 1
  2. PATCHLEVEL = 35
  3. SUBLEVEL = 0
  4. EXTRAVERSION = .git
  5. NAME = Unnamed
  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 print "Entering directory ..."
  12. MAKEFLAGS += --no-print-directory
  13. # We are using a recursive build, so we need to do a little thinking
  14. # to get the ordering right.
  15. #
  16. # Most importantly: sub-Makefiles should only ever modify files in
  17. # their own directory. If in some directory we have a dependency on
  18. # a file in another dir (which doesn't happen often, but it's often
  19. # unavoidable when linking the built-in.o targets which finally
  20. # turn into busybox), we will call a sub make in that other dir, and
  21. # after that we are sure that everything which is in that other dir
  22. # is now up to date.
  23. #
  24. # The only cases where we need to modify files which have global
  25. # effects are thus separated out and done before the recursive
  26. # descending is started. They are now explicitly listed as the
  27. # prepare rule.
  28. # To put more focus on warnings, be less verbose as default
  29. # Use 'make V=1' to see the full commands
  30. ifdef V
  31. ifeq ("$(origin V)", "command line")
  32. KBUILD_VERBOSE = $(V)
  33. endif
  34. endif
  35. ifndef KBUILD_VERBOSE
  36. KBUILD_VERBOSE = 0
  37. endif
  38. # Call sparse as part of compilation of C files
  39. # Use 'make C=1' to enable sparse checking
  40. ifdef C
  41. ifeq ("$(origin C)", "command line")
  42. KBUILD_CHECKSRC = $(C)
  43. endif
  44. endif
  45. ifndef KBUILD_CHECKSRC
  46. KBUILD_CHECKSRC = 0
  47. endif
  48. # Use make M=dir to specify directory of external module to build
  49. # Old syntax make ... SUBDIRS=$PWD is still supported
  50. # Setting the environment variable KBUILD_EXTMOD take precedence
  51. ifdef SUBDIRS
  52. KBUILD_EXTMOD ?= $(SUBDIRS)
  53. endif
  54. ifdef M
  55. ifeq ("$(origin M)", "command line")
  56. KBUILD_EXTMOD := $(M)
  57. endif
  58. endif
  59. # kbuild supports saving output files in a separate directory.
  60. # To locate output files in a separate directory two syntaxes are supported.
  61. # In both cases the working directory must be the root of the kernel src.
  62. # 1) O=
  63. # Use "make O=dir/to/store/output/files/"
  64. #
  65. # 2) Set KBUILD_OUTPUT
  66. # Set the environment variable KBUILD_OUTPUT to point to the directory
  67. # where the output files shall be placed.
  68. # export KBUILD_OUTPUT=dir/to/store/output/files/
  69. # make
  70. #
  71. # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  72. # variable.
  73. # KBUILD_SRC is set on invocation of make in OBJ directory
  74. # KBUILD_SRC is not intended to be used by the regular user (for now)
  75. ifeq ($(KBUILD_SRC),)
  76. # OK, Make called in directory where kernel src resides
  77. # Do we want to locate output files in a separate directory?
  78. ifdef O
  79. ifeq ("$(origin O)", "command line")
  80. KBUILD_OUTPUT := $(O)
  81. endif
  82. endif
  83. # That's our default target when none is given on the command line
  84. PHONY := _all
  85. _all:
  86. ifneq ($(KBUILD_OUTPUT),)
  87. # Invoke a second make in the output directory, passing relevant variables
  88. # check that the output directory actually exists
  89. saved-output := $(KBUILD_OUTPUT)
  90. KBUILD_OUTPUT := $(shell cd $(KBUILD_OUTPUT) && /bin/pwd)
  91. $(if $(KBUILD_OUTPUT),, \
  92. $(error output directory "$(saved-output)" does not exist))
  93. PHONY += $(MAKECMDGOALS)
  94. $(filter-out _all,$(MAKECMDGOALS)) _all:
  95. $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
  96. KBUILD_SRC=$(CURDIR) \
  97. KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@
  98. # Leave processing to above invocation of make
  99. skip-makefile := 1
  100. endif # ifneq ($(KBUILD_OUTPUT),)
  101. endif # ifeq ($(KBUILD_SRC),)
  102. # We process the rest of the Makefile if this is the final invocation of make
  103. ifeq ($(skip-makefile),)
  104. # If building an external module we do not care about the all: rule
  105. # but instead _all depend on modules
  106. PHONY += all
  107. ifeq ($(KBUILD_EXTMOD),)
  108. _all: all
  109. else
  110. _all: modules
  111. endif
  112. srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
  113. TOPDIR := $(srctree)
  114. # FIXME - TOPDIR is obsolete, use srctree/objtree
  115. objtree := $(CURDIR)
  116. src := $(srctree)
  117. obj := $(objtree)
  118. VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
  119. export srctree objtree VPATH TOPDIR
  120. # Cross compiling and selecting different set of gcc/bin-utils
  121. # ---------------------------------------------------------------------------
  122. #
  123. # When performing cross compilation for other architectures ARCH shall be set
  124. # to the target architecture. (See arch/* for the possibilities).
  125. # ARCH can be set during invocation of make:
  126. # make ARCH=ia64
  127. # Another way is to have ARCH set in the environment.
  128. # The default ARCH is the host where make is executed.
  129. # CROSS_COMPILE specify the prefix used for all executables used
  130. # during compilation. Only gcc and related bin-utils executables
  131. # are prefixed with $(CROSS_COMPILE).
  132. # CROSS_COMPILE can be set on the command line
  133. # make CROSS_COMPILE=ia64-linux-
  134. # Alternatively CROSS_COMPILE can be set in the environment.
  135. # Default value for CROSS_COMPILE is not to prefix executables
  136. # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  137. CROSS_COMPILE ?=
  138. # bbox: we may have CONFIG_CROSS_COMPILER_PREFIX in .config,
  139. # and it has not been included yet... thus using an awkward syntax.
  140. ifeq ($(CROSS_COMPILE),)
  141. CROSS_COMPILE := $(shell grep ^CONFIG_CROSS_COMPILER_PREFIX .config 2>/dev/null)
  142. CROSS_COMPILE := $(subst CONFIG_CROSS_COMPILER_PREFIX=,,$(CROSS_COMPILE))
  143. CROSS_COMPILE := $(subst ",,$(CROSS_COMPILE))
  144. #")
  145. endif
  146. # SUBARCH tells the usermode build what the underlying arch is. That is set
  147. # first, and if a usermode build is happening, the "ARCH=um" on the command
  148. # line overrides the setting of ARCH below. If a native build is happening,
  149. # then ARCH is assigned, getting whatever value it gets normally, and
  150. # SUBARCH is subsequently ignored.
  151. ifneq ($(CROSS_COMPILE),)
  152. SUBARCH := $(shell echo $(CROSS_COMPILE) | cut -d- -f1 | sed 's:^.*/::g')
  153. else
  154. SUBARCH := $(shell uname -m)
  155. endif
  156. SUBARCH := $(shell echo $(SUBARCH) | sed -e s/i.86/i386/ -e s/sun4u/sparc64/ \
  157. -e s/arm.*/arm/ -e s/sa110/arm/ \
  158. -e s/s390x/s390/ -e s/parisc64/parisc/ \
  159. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ )
  160. ARCH ?= $(SUBARCH)
  161. # Architecture as present in compile.h
  162. UTS_MACHINE := $(ARCH)
  163. # SHELL used by kbuild
  164. CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  165. else if [ -x /bin/bash ]; then echo /bin/bash; \
  166. else echo sh; fi ; fi)
  167. # Decide whether to build built-in, modular, or both.
  168. # Normally, just do built-in.
  169. KBUILD_MODULES :=
  170. KBUILD_BUILTIN := 1
  171. # If we have only "make modules", don't compile built-in objects.
  172. # When we're building modules with modversions, we need to consider
  173. # the built-in objects during the descend as well, in order to
  174. # make sure the checksums are uptodate before we record them.
  175. ifeq ($(MAKECMDGOALS),modules)
  176. KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  177. endif
  178. # If we have "make <whatever> modules", compile modules
  179. # in addition to whatever we do anyway.
  180. # Just "make" or "make all" shall build modules as well
  181. ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  182. KBUILD_MODULES := 1
  183. endif
  184. ifeq ($(MAKECMDGOALS),)
  185. KBUILD_MODULES := 1
  186. endif
  187. export KBUILD_MODULES KBUILD_BUILTIN
  188. export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
  189. # Beautify output
  190. # ---------------------------------------------------------------------------
  191. #
  192. # Normally, we echo the whole command before executing it. By making
  193. # that echo $($(quiet)$(cmd)), we now have the possibility to set
  194. # $(quiet) to choose other forms of output instead, e.g.
  195. #
  196. # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  197. # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  198. #
  199. # If $(quiet) is empty, the whole command will be printed.
  200. # If it is set to "quiet_", only the short version will be printed.
  201. # If it is set to "silent_", nothing wil be printed at all, since
  202. # the variable $(silent_cmd_cc_o_c) doesn't exist.
  203. #
  204. # A simple variant is to prefix commands with $(Q) - that's useful
  205. # for commands that shall be hidden in non-verbose mode.
  206. #
  207. # $(Q)ln $@ :<
  208. #
  209. # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  210. # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  211. ifeq ($(KBUILD_VERBOSE),1)
  212. quiet =
  213. Q =
  214. else
  215. quiet=quiet_
  216. Q = @
  217. endif
  218. # If the user is running make -s (silent mode), suppress echoing of
  219. # commands
  220. ifneq ($(findstring s,$(MAKEFLAGS)),)
  221. quiet=silent_
  222. endif
  223. export quiet Q KBUILD_VERBOSE
  224. # Look for make include files relative to root of kernel src
  225. MAKEFLAGS += --include-dir=$(srctree)
  226. HOSTCC = gcc
  227. HOSTCXX = g++
  228. HOSTCFLAGS :=
  229. HOSTCXXFLAGS :=
  230. # We need some generic definitions
  231. include $(srctree)/scripts/Kbuild.include
  232. HOSTCFLAGS += $(call hostcc-option,-Wall -Wstrict-prototypes -O2 -fomit-frame-pointer,)
  233. HOSTCXXFLAGS += -O2
  234. # For maximum performance (+ possibly random breakage, uncomment
  235. # the following)
  236. MAKEFLAGS += -rR
  237. # Make variables (CC, etc...)
  238. AS = $(CROSS_COMPILE)as
  239. CC = $(CROSS_COMPILE)gcc
  240. LD = $(CC) -nostdlib
  241. CPP = $(CC) -E
  242. AR = $(CROSS_COMPILE)ar
  243. NM = $(CROSS_COMPILE)nm
  244. STRIP = $(CROSS_COMPILE)strip
  245. OBJCOPY = $(CROSS_COMPILE)objcopy
  246. OBJDUMP = $(CROSS_COMPILE)objdump
  247. PKG_CONFIG ?= $(CROSS_COMPILE)pkg-config
  248. AWK = awk
  249. GENKSYMS = scripts/genksyms/genksyms
  250. DEPMOD = /sbin/depmod
  251. KALLSYMS = scripts/kallsyms
  252. PERL = perl
  253. CHECK = sparse
  254. CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF)
  255. MODFLAGS = -DMODULE
  256. CFLAGS_MODULE = $(MODFLAGS)
  257. AFLAGS_MODULE = $(MODFLAGS)
  258. LDFLAGS_MODULE = -r
  259. CFLAGS_KERNEL =
  260. AFLAGS_KERNEL =
  261. # Use LINUXINCLUDE when you must reference the include/ directory.
  262. # Needed to be compatible with the O= option
  263. CFLAGS := $(CFLAGS)
  264. # Added only to final link stage of busybox binary
  265. CFLAGS_busybox := $(CFLAGS_busybox)
  266. CPPFLAGS := $(CPPFLAGS)
  267. AFLAGS := $(AFLAGS)
  268. LDFLAGS := $(LDFLAGS)
  269. LDLIBS :=
  270. # Read KERNELRELEASE from .kernelrelease (if it exists)
  271. KERNELRELEASE = $(shell cat .kernelrelease 2> /dev/null)
  272. KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION)
  273. export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION \
  274. ARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC \
  275. CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE \
  276. HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
  277. export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
  278. export CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
  279. export AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
  280. export FLTFLAGS
  281. # When compiling out-of-tree modules, put MODVERDIR in the module
  282. # tree rather than in the kernel tree. The kernel tree might
  283. # even be read-only.
  284. export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
  285. # Files to ignore in find ... statements
  286. 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
  287. export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git
  288. # ===========================================================================
  289. # Rules shared between *config targets and build targets
  290. # Basic helpers built in scripts/
  291. PHONY += scripts_basic
  292. scripts_basic:
  293. $(Q)$(MAKE) $(build)=scripts/basic
  294. # To avoid any implicit rule to kick in, define an empty command.
  295. scripts/basic/%: scripts_basic ;
  296. # This target generates Kbuild's and Config.in's from *.c files
  297. PHONY += gen_build_files
  298. gen_build_files: $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) $(wildcard $(srctree)/embed/*)
  299. $(Q)$(srctree)/scripts/gen_build_files.sh $(srctree) $(objtree)
  300. # bbox: we have helpers in applets/
  301. # we depend on scripts_basic, since scripts/basic/fixdep
  302. # must be built before any other host prog
  303. PHONY += applets_dir
  304. applets_dir: scripts_basic gen_build_files include/config/MARKER
  305. $(Q)$(MAKE) $(build)=applets
  306. applets/%: applets_dir ;
  307. PHONY += outputmakefile
  308. # outputmakefile generates a Makefile in the output directory, if using a
  309. # separate output directory. This allows convenient use of make in the
  310. # output directory.
  311. outputmakefile:
  312. ifneq ($(KBUILD_SRC),)
  313. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
  314. $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
  315. endif
  316. # To make sure we do not include .config for any of the *config targets
  317. # catch them early, and hand them over to scripts/kconfig/Makefile
  318. # It is allowed to specify more targets when calling make, including
  319. # mixing *config targets and build targets.
  320. # For example 'make oldconfig all'.
  321. # Detect when mixed targets is specified, and make a second invocation
  322. # of make so .config is not included in this case either (for *config).
  323. no-dot-config-targets := clean mrproper distclean \
  324. cscope TAGS tags help %docs
  325. #bbox# check% is removed from above
  326. config-targets := 0
  327. mixed-targets := 0
  328. dot-config := 1
  329. ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  330. ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  331. dot-config := 0
  332. endif
  333. endif
  334. ifeq ($(KBUILD_EXTMOD),)
  335. ifneq ($(filter config %config,$(MAKECMDGOALS)),)
  336. config-targets := 1
  337. ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
  338. mixed-targets := 1
  339. endif
  340. endif
  341. endif
  342. ifeq ($(mixed-targets),1)
  343. # ===========================================================================
  344. # We're called with mixed targets (*config and build targets).
  345. # Handle them one by one.
  346. %:: FORCE
  347. $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
  348. else
  349. ifeq ($(config-targets),1)
  350. # ===========================================================================
  351. # *config targets only - make sure prerequisites are updated, and descend
  352. # in scripts/kconfig to make the *config target
  353. # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
  354. # KBUILD_DEFCONFIG may point out an alternative default configuration
  355. # used for 'make defconfig'
  356. -include $(srctree)/arch/$(ARCH)/Makefile
  357. export KBUILD_DEFCONFIG
  358. config: scripts_basic outputmakefile gen_build_files FORCE
  359. $(Q)mkdir -p include
  360. $(Q)$(MAKE) $(build)=scripts/kconfig $@
  361. $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
  362. %config: scripts_basic outputmakefile gen_build_files FORCE
  363. $(Q)mkdir -p include
  364. $(Q)$(MAKE) $(build)=scripts/kconfig $@
  365. $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= .kernelrelease
  366. else
  367. # ===========================================================================
  368. # Build targets only - this includes busybox, arch specific targets, clean
  369. # targets and others. In general all targets except *config targets.
  370. ifeq ($(KBUILD_EXTMOD),)
  371. # Additional helpers built in scripts/
  372. # Carefully list dependencies so we do not try to build scripts twice
  373. # in parallel
  374. PHONY += scripts
  375. scripts: gen_build_files scripts_basic include/config/MARKER
  376. $(Q)$(MAKE) $(build)=$(@)
  377. scripts_basic: include/autoconf.h
  378. # Objects we will link into busybox / subdirs we need to visit
  379. core-y := \
  380. applets/ \
  381. libs-y := \
  382. archival/ \
  383. archival/libarchive/ \
  384. console-tools/ \
  385. coreutils/ \
  386. coreutils/libcoreutils/ \
  387. debianutils/ \
  388. klibc-utils/ \
  389. e2fsprogs/ \
  390. editors/ \
  391. findutils/ \
  392. init/ \
  393. libbb/ \
  394. libpwdgrp/ \
  395. loginutils/ \
  396. mailutils/ \
  397. miscutils/ \
  398. modutils/ \
  399. networking/ \
  400. networking/libiproute/ \
  401. networking/udhcp/ \
  402. printutils/ \
  403. procps/ \
  404. runit/ \
  405. selinux/ \
  406. shell/ \
  407. sysklogd/ \
  408. util-linux/ \
  409. util-linux/volume_id/ \
  410. endif # KBUILD_EXTMOD
  411. ifeq ($(dot-config),1)
  412. # In this section, we need .config
  413. # Read in dependencies to all Kconfig* files, make sure to run
  414. # oldconfig if changes are detected.
  415. -include .kconfig.d
  416. -include .config
  417. # If .config needs to be updated, it will be done via the dependency
  418. # that autoconf has on .config.
  419. # To avoid any implicit rule to kick in, define an empty command
  420. .config .kconfig.d: ;
  421. -include $(srctree)/arch/$(ARCH)/Makefile
  422. # Now we can define CFLAGS etc according to .config
  423. include $(srctree)/Makefile.flags
  424. # If .config is newer than include/autoconf.h, someone tinkered
  425. # with it and forgot to run make oldconfig.
  426. # If kconfig.d is missing then we are probarly in a cleaned tree so
  427. # we execute the config step to be sure to catch updated Kconfig files
  428. include/autoconf.h: .kconfig.d .config $(wildcard $(srctree)/*/*.c) $(wildcard $(srctree)/*/*/*.c) | gen_build_files
  429. $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
  430. include/usage.h: gen_build_files
  431. else
  432. # Dummy target needed, because used as prerequisite
  433. include/autoconf.h: ;
  434. endif
  435. # The all: target is the default when no target is given on the
  436. # command line.
  437. # This allow a user to issue only 'make' to build a kernel including modules
  438. # Defaults busybox but it is usually overridden in the arch makefile
  439. all: busybox doc
  440. # arch Makefile may override CC so keep this after arch Makefile is included
  441. #bbox# NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
  442. CHECKFLAGS += $(NOSTDINC_FLAGS)
  443. # Default kernel image to build when no specific target is given.
  444. # KBUILD_IMAGE may be overruled on the commandline or
  445. # set in the environment
  446. # Also any assignments in arch/$(ARCH)/Makefile take precedence over
  447. # this default value
  448. export KBUILD_IMAGE ?= busybox
  449. #
  450. # INSTALL_PATH specifies where to place the updated kernel and system map
  451. # images. Default is /boot, but you can set it to other values
  452. export INSTALL_PATH ?= /boot
  453. #
  454. # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
  455. # relocations required by build roots. This is not defined in the
  456. # makefile but the argument can be passed to make if needed.
  457. #
  458. MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
  459. export MODLIB
  460. ifeq ($(KBUILD_EXTMOD),)
  461. busybox-dirs := $(patsubst %/,%,$(filter %/, $(core-y) $(core-m) $(libs-y) $(libs-m)))
  462. busybox-alldirs := $(sort $(busybox-dirs) $(patsubst %/,%,$(filter %/, \
  463. $(core-n) $(core-) $(libs-n) $(libs-) \
  464. )))
  465. core-y := $(patsubst %/, %/built-in.o, $(core-y))
  466. libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
  467. libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
  468. libs-y := $(libs-y1) $(libs-y2)
  469. # Build busybox
  470. # ---------------------------------------------------------------------------
  471. # busybox is build from the objects selected by $(busybox-init) and
  472. # $(busybox-main). Most are built-in.o files from top-level directories
  473. # in the kernel tree, others are specified in arch/$(ARCH)Makefile.
  474. # Ordering when linking is important, and $(busybox-init) must be first.
  475. #
  476. # busybox
  477. # ^
  478. # |
  479. # +-< $(busybox-init)
  480. # | +--< init/version.o + more
  481. # |
  482. # +--< $(busybox-main)
  483. # | +--< driver/built-in.o mm/built-in.o + more
  484. # |
  485. # +-< kallsyms.o (see description in CONFIG_KALLSYMS section)
  486. #
  487. # busybox version (uname -v) cannot be updated during normal
  488. # descending-into-subdirs phase since we do not yet know if we need to
  489. # update busybox.
  490. # Therefore this step is delayed until just before final link of busybox -
  491. # except in the kallsyms case where it is done just before adding the
  492. # symbols to the kernel.
  493. #
  494. # System.map is generated to document addresses of all kernel symbols
  495. busybox-all := $(core-y) $(libs-y)
  496. # Rule to link busybox - also used during CONFIG_KALLSYMS
  497. # May be overridden by arch/$(ARCH)/Makefile
  498. quiet_cmd_busybox__ ?= LINK $@
  499. cmd_busybox__ ?= $(srctree)/scripts/trylink \
  500. "$@" \
  501. "$(CC)" \
  502. "$(CFLAGS) $(CFLAGS_busybox)" \
  503. "$(LDFLAGS) $(EXTRA_LDFLAGS)" \
  504. "$(core-y)" \
  505. "$(libs-y)" \
  506. "$(LDLIBS)" \
  507. "$(CONFIG_EXTRA_LDLIBS)" \
  508. && $(srctree)/scripts/generate_BUFSIZ.sh --post include/common_bufsiz.h
  509. # Generate System.map
  510. quiet_cmd_sysmap = SYSMAP
  511. cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap
  512. # Link of busybox
  513. # If CONFIG_KALLSYMS is set .version is already updated
  514. # Generate System.map and verify that the content is consistent
  515. # Use + in front of the busybox_version rule to silent warning with make -j2
  516. # First command is ':' to allow us to use + in front of the rule
  517. define rule_busybox__
  518. :
  519. $(call cmd,busybox__)
  520. $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
  521. endef
  522. ifdef CONFIG_KALLSYMS
  523. # Generate section listing all symbols and add it into busybox $(kallsyms.o)
  524. # It's a three stage process:
  525. # o .tmp_busybox1 has all symbols and sections, but __kallsyms is
  526. # empty
  527. # Running kallsyms on that gives us .tmp_kallsyms1.o with
  528. # the right size - busybox version (uname -v) is updated during this step
  529. # o .tmp_busybox2 now has a __kallsyms section of the right size,
  530. # but due to the added section, some addresses have shifted.
  531. # From here, we generate a correct .tmp_kallsyms2.o
  532. # o The correct .tmp_kallsyms2.o is linked into the final busybox.
  533. # o Verify that the System.map from busybox matches the map from
  534. # .tmp_busybox2, just in case we did not generate kallsyms correctly.
  535. # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using
  536. # .tmp_busybox3 and .tmp_kallsyms3.o. This is only meant as a
  537. # temporary bypass to allow the kernel to be built while the
  538. # maintainers work out what went wrong with kallsyms.
  539. ifdef CONFIG_KALLSYMS_EXTRA_PASS
  540. last_kallsyms := 3
  541. else
  542. last_kallsyms := 2
  543. endif
  544. kallsyms.o := .tmp_kallsyms$(last_kallsyms).o
  545. define verify_kallsyms
  546. $(Q)$(if $($(quiet)cmd_sysmap), \
  547. echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \
  548. $(cmd_sysmap) .tmp_busybox$(last_kallsyms) .tmp_System.map
  549. $(Q)cmp -s System.map .tmp_System.map || \
  550. (echo Inconsistent kallsyms data; \
  551. echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \
  552. rm .tmp_kallsyms* ; /bin/false )
  553. endef
  554. # Update busybox version before link
  555. # Use + in front of this rule to silent warning about make -j1
  556. # First command is ':' to allow us to use + in front of this rule
  557. cmd_ksym_ld = $(cmd_busybox__)
  558. define rule_ksym_ld
  559. :
  560. +$(call cmd,busybox_version)
  561. $(call cmd,busybox__)
  562. $(Q)echo 'cmd_$@ := $(cmd_busybox__)' > $(@D)/.$(@F).cmd
  563. endef
  564. # Generate .S file with all kernel symbols
  565. quiet_cmd_kallsyms = KSYM $@
  566. cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) \
  567. $(if $(CONFIG_KALLSYMS_ALL),--all-symbols) > $@
  568. .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE
  569. $(call if_changed_dep,as_o_S)
  570. .tmp_kallsyms%.S: .tmp_busybox% $(KALLSYMS)
  571. $(call cmd,kallsyms)
  572. # .tmp_busybox1 must be complete except kallsyms, so update busybox version
  573. .tmp_busybox1: $(busybox-lds) $(busybox-all) FORCE
  574. $(call if_changed_rule,ksym_ld)
  575. .tmp_busybox2: $(busybox-lds) $(busybox-all) .tmp_kallsyms1.o FORCE
  576. $(call if_changed,busybox__)
  577. .tmp_busybox3: $(busybox-lds) $(busybox-all) .tmp_kallsyms2.o FORCE
  578. $(call if_changed,busybox__)
  579. # Needs to visit scripts/ before $(KALLSYMS) can be used.
  580. $(KALLSYMS): scripts ;
  581. # Generate some data for debugging strange kallsyms problems
  582. debug_kallsyms: .tmp_map$(last_kallsyms)
  583. .tmp_map%: .tmp_busybox% FORCE
  584. ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@
  585. .tmp_map3: .tmp_map2
  586. .tmp_map2: .tmp_map1
  587. endif # ifdef CONFIG_KALLSYMS
  588. # busybox image - including updated kernel symbols
  589. busybox_unstripped: $(busybox-all) FORCE
  590. $(call if_changed_rule,busybox__)
  591. $(Q)rm -f .old_version
  592. busybox: busybox_unstripped
  593. ifeq ($(SKIP_STRIP),y)
  594. $(Q)cp $< $@
  595. else
  596. $(Q)$(STRIP) -s --remove-section=.note --remove-section=.comment \
  597. busybox_unstripped -o $@
  598. # strip is confused by PIE executable and does not set exec bits
  599. $(Q)chmod a+x $@
  600. endif
  601. # The actual objects are generated when descending,
  602. # make sure no implicit rule kicks in
  603. $(sort $(busybox-all)): $(busybox-dirs) ;
  604. # Handle descending into subdirectories listed in $(busybox-dirs)
  605. # Preset locale variables to speed up the build process. Limit locale
  606. # tweaks to this spot to avoid wrong language settings when running
  607. # make menuconfig etc.
  608. # Error messages still appears in the original language
  609. PHONY += $(busybox-dirs)
  610. $(busybox-dirs): prepare scripts
  611. $(Q)$(MAKE) $(build)=$@
  612. # Build the kernel release string
  613. # The KERNELRELEASE is stored in a file named .kernelrelease
  614. # to be used when executing for example make install or make modules_install
  615. #
  616. # Take the contents of any files called localversion* and the config
  617. # variable CONFIG_LOCALVERSION and append them to KERNELRELEASE.
  618. # LOCALVERSION from the command line override all of this
  619. nullstring :=
  620. space := $(nullstring) # end of line
  621. ___localver = $(objtree)/localversion* $(srctree)/localversion*
  622. __localver = $(sort $(wildcard $(___localver)))
  623. # skip backup files (containing '~')
  624. _localver = $(foreach f, $(__localver), $(if $(findstring ~, $(f)),,$(f)))
  625. localver = $(subst $(space),, \
  626. $(shell cat /dev/null $(_localver)) \
  627. $(patsubst "%",%,$(CONFIG_LOCALVERSION)))
  628. # If CONFIG_LOCALVERSION_AUTO is set scripts/setlocalversion is called
  629. # and if the SCM is know a tag from the SCM is appended.
  630. # The appended tag is determinded by the SCM used.
  631. #
  632. # Currently, only git is supported.
  633. # Other SCMs can edit scripts/setlocalversion and add the appropriate
  634. # checks as needed.
  635. ifdef _BB_DISABLED_CONFIG_LOCALVERSION_AUTO
  636. _localver-auto = $(shell $(CONFIG_SHELL) \
  637. $(srctree)/scripts/setlocalversion $(srctree))
  638. localver-auto = $(LOCALVERSION)$(_localver-auto)
  639. endif
  640. localver-full = $(localver)$(localver-auto)
  641. # Store (new) KERNELRELASE string in .kernelrelease
  642. kernelrelease = $(KERNELVERSION)$(localver-full)
  643. .kernelrelease: FORCE
  644. $(Q)rm -f $@
  645. $(Q)echo $(kernelrelease) > $@
  646. # Things we need to do before we recursively start building the kernel
  647. # or the modules are listed in "prepare".
  648. # A multi level approach is used. prepareN is processed before prepareN-1.
  649. # archprepare is used in arch Makefiles and when processed asm symlink,
  650. # version.h and scripts_basic is processed / created.
  651. # Listed in dependency order
  652. PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
  653. # prepare-all is deprecated, use prepare as valid replacement
  654. PHONY += prepare-all
  655. # prepare3 is used to check if we are building in a separate output directory,
  656. # and if so do:
  657. # 1) Check that make has not been executed in the kernel src $(srctree)
  658. # 2) Create the include2 directory, used for the second asm symlink
  659. prepare3: .kernelrelease
  660. ifneq ($(KBUILD_SRC),)
  661. @echo ' Using $(srctree) as source for busybox'
  662. $(Q)if [ -f $(srctree)/.config ]; then \
  663. echo " $(srctree) is not clean, please run 'make mrproper'";\
  664. echo " in the '$(srctree)' directory.";\
  665. /bin/false; \
  666. fi;
  667. $(Q)if [ ! -d include2 ]; then mkdir -p include2; fi;
  668. $(Q)ln -fsn $(srctree)/include/asm-$(ARCH) include2/asm
  669. endif
  670. # prepare2 creates a makefile if using a separate output directory
  671. prepare2: prepare3 outputmakefile
  672. prepare1: prepare2 include/config/MARKER
  673. ifneq ($(KBUILD_MODULES),)
  674. $(Q)mkdir -p $(MODVERDIR)
  675. $(Q)rm -f $(MODVERDIR)/*
  676. endif
  677. archprepare: prepare1 scripts_basic applets_dir
  678. prepare0: archprepare FORCE
  679. $(Q)$(MAKE) $(build)=.
  680. # All the preparing..
  681. prepare prepare-all: prepare0
  682. # Leave this as default for preprocessing busybox.lds.S, which is now
  683. # done in arch/$(ARCH)/kernel/Makefile
  684. export CPPFLAGS_busybox.lds += -P -C -U$(ARCH)
  685. # FIXME: The asm symlink changes when $(ARCH) changes. That's
  686. # hard to detect, but I suppose "make mrproper" is a good idea
  687. # before switching between archs anyway.
  688. #bbox# include/asm:
  689. #bbox# @echo ' SYMLINK $@ -> include/asm-$(ARCH)'
  690. #bbox# $(Q)if [ ! -d include ]; then mkdir -p include; fi;
  691. #bbox# @ln -fsn asm-$(ARCH) $@
  692. # Split autoconf.h into include/linux/config/*
  693. quiet_cmd_gen_bbconfigopts = GEN include/bbconfigopts.h
  694. cmd_gen_bbconfigopts = $(srctree)/scripts/mkconfigs include/bbconfigopts.h include/bbconfigopts_bz2.h
  695. quiet_cmd_gen_common_bufsiz = GEN include/common_bufsiz.h
  696. cmd_gen_common_bufsiz = $(srctree)/scripts/generate_BUFSIZ.sh include/common_bufsiz.h
  697. quiet_cmd_split_autoconf = SPLIT include/autoconf.h -> include/config/*
  698. cmd_split_autoconf = scripts/basic/split-include include/autoconf.h include/config
  699. quiet_cmd_gen_embedded_scripts = GEN include/embedded_scripts.h
  700. cmd_gen_embedded_scripts = $(srctree)/scripts/embedded_scripts include/embedded_scripts.h $(srctree)/embed $(srctree)/applets_sh
  701. #bbox# piggybacked generation of few .h files
  702. include/config/MARKER: scripts/basic/split-include include/autoconf.h $(wildcard $(srctree)/embed/*) $(wildcard $(srctree)/applets_sh/*) $(srctree)/scripts/embedded_scripts
  703. $(call cmd,split_autoconf)
  704. $(call cmd,gen_bbconfigopts)
  705. $(call cmd,gen_common_bufsiz)
  706. $(call cmd,gen_embedded_scripts)
  707. @touch $@
  708. # Generate some files
  709. # ---------------------------------------------------------------------------
  710. # KERNELRELEASE can change from a few different places, meaning version.h
  711. # needs to be updated, so this check is forced on all builds
  712. uts_len := 64
  713. define filechk_version.h
  714. if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
  715. echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
  716. exit 1; \
  717. fi; \
  718. (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"; \
  719. echo \#define LINUX_VERSION_CODE `expr $(VERSION) \\* 65536 + $(PATCHLEVEL) \\* 256 + $(SUBLEVEL)`; \
  720. echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))'; \
  721. )
  722. endef
  723. # ---------------------------------------------------------------------------
  724. PHONY += depend dep
  725. depend dep:
  726. @echo '*** Warning: make $@ is unnecessary now.'
  727. # ---------------------------------------------------------------------------
  728. # Modules
  729. ifdef _BB_DISABLED_CONFIG_MODULES
  730. # By default, build modules as well
  731. all: modules
  732. # Build modules
  733. PHONY += modules
  734. modules: $(busybox-dirs) $(if $(KBUILD_BUILTIN),busybox)
  735. @echo ' Building modules, stage 2.';
  736. $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
  737. # Target to prepare building external modules
  738. PHONY += modules_prepare
  739. modules_prepare: prepare scripts
  740. # Target to install modules
  741. PHONY += modules_install
  742. modules_install: _modinst_ _modinst_post
  743. PHONY += _modinst_
  744. _modinst_:
  745. @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \
  746. echo "Warning: you may need to install module-init-tools"; \
  747. echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\
  748. sleep 1; \
  749. fi
  750. @rm -rf $(MODLIB)/kernel
  751. @rm -f $(MODLIB)/source
  752. @mkdir -p $(MODLIB)/kernel
  753. @ln -s $(srctree) $(MODLIB)/source
  754. @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
  755. rm -f $(MODLIB)/build ; \
  756. ln -s $(objtree) $(MODLIB)/build ; \
  757. fi
  758. $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
  759. # If System.map exists, run depmod. This deliberately does not have a
  760. # dependency on System.map since that would run the dependency tree on
  761. # busybox. This depmod is only for convenience to give the initial
  762. # boot a modules.dep even before / is mounted read-write. However the
  763. # boot script depmod is the master version.
  764. ifeq "$(strip $(INSTALL_MOD_PATH))" ""
  765. depmod_opts :=
  766. else
  767. depmod_opts := -b $(INSTALL_MOD_PATH) -r
  768. endif
  769. PHONY += _modinst_post
  770. _modinst_post: _modinst_
  771. if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi
  772. else # CONFIG_MODULES
  773. # Modules not configured
  774. # ---------------------------------------------------------------------------
  775. modules modules_install: FORCE
  776. @echo
  777. @echo "The present busybox configuration has modules disabled."
  778. @echo "Type 'make config' and enable loadable module support."
  779. @echo "Then build a kernel with module support enabled."
  780. @echo
  781. @exit 1
  782. endif # CONFIG_MODULES
  783. ###
  784. # Cleaning is done on three levels.
  785. # make clean Delete most generated files
  786. # Leave enough to build external modules
  787. # make mrproper Delete the current configuration, and all generated files
  788. # make distclean Remove editor backup files, patch leftover files and the like
  789. # Directories & files removed with 'make clean'
  790. CLEAN_DIRS += $(MODVERDIR) _install 0_lib
  791. CLEAN_FILES += busybox busybox_unstripped* busybox.links \
  792. System.map .kernelrelease \
  793. .tmp_kallsyms* .tmp_version .tmp_busybox* .tmp_System.map
  794. # Directories & files removed with 'make mrproper'
  795. MRPROPER_DIRS += include/config include2
  796. MRPROPER_FILES += .config .config.old include/asm .version .old_version \
  797. include/NUM_APPLETS.h \
  798. include/common_bufsiz.h \
  799. include/autoconf.h \
  800. include/bbconfigopts.h \
  801. include/bbconfigopts_bz2.h \
  802. include/embedded_scripts.h \
  803. include/usage_compressed.h \
  804. include/applet_tables.h \
  805. include/applets.h \
  806. include/usage.h \
  807. applets/usage \
  808. .kernelrelease Module.symvers tags TAGS cscope* \
  809. busybox_old
  810. # clean - Delete most, but leave enough to build external modules
  811. #
  812. clean: rm-dirs := $(CLEAN_DIRS)
  813. clean: rm-files := $(CLEAN_FILES)
  814. clean-dirs := $(addprefix _clean_,$(srctree) $(busybox-alldirs))
  815. PHONY += $(clean-dirs) clean archclean
  816. $(clean-dirs):
  817. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  818. clean: archclean $(clean-dirs)
  819. $(call cmd,rmdirs)
  820. $(call cmd,rmfiles)
  821. @find . $(RCS_FIND_IGNORE) \
  822. \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
  823. -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
  824. -type f -print | xargs rm -f
  825. PHONY += doc-clean
  826. doc-clean: rm-files := docs/busybox.pod \
  827. docs/BusyBox.html docs/busybox.1 docs/BusyBox.txt
  828. doc-clean:
  829. $(call cmd,rmfiles)
  830. # mrproper - Delete all generated files, including .config
  831. #
  832. mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
  833. mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
  834. mrproper-dirs := $(addprefix _mrproper_,scripts)
  835. PHONY += $(mrproper-dirs) mrproper archmrproper
  836. $(mrproper-dirs):
  837. $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
  838. mrproper: clean archmrproper $(mrproper-dirs)
  839. $(call cmd,rmdirs)
  840. $(call cmd,rmfiles)
  841. @find . -name Config.src | sed 's/.src$$/.in/' | xargs -r rm -f
  842. @find . -name Kbuild.src | sed 's/.src$$//' | xargs -r rm -f
  843. # distclean
  844. #
  845. PHONY += distclean
  846. distclean: mrproper
  847. @find $(srctree) $(RCS_FIND_IGNORE) \
  848. \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
  849. -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
  850. -o -name '.*.rej' -o -name '*.tmp' -o -size 0 \
  851. -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \
  852. -type f -print | xargs rm -f
  853. # Packaging of the kernel to various formats
  854. # ---------------------------------------------------------------------------
  855. # rpm target kept for backward compatibility
  856. package-dir := $(srctree)/scripts/package
  857. %pkg: FORCE
  858. $(Q)$(MAKE) $(build)=$(package-dir) $@
  859. rpm: FORCE
  860. $(Q)$(MAKE) $(build)=$(package-dir) $@
  861. # Brief documentation of the typical targets used
  862. # ---------------------------------------------------------------------------
  863. boards := $(wildcard $(srctree)/configs/*_defconfig)
  864. boards := $(notdir $(boards))
  865. -include $(srctree)/Makefile.help
  866. # Documentation targets
  867. # ---------------------------------------------------------------------------
  868. %docs: scripts_basic FORCE
  869. $(Q)$(MAKE) $(build)=Documentation/DocBook $@
  870. else # KBUILD_EXTMOD
  871. ###
  872. # External module support.
  873. # When building external modules the kernel used as basis is considered
  874. # read-only, and no consistency checks are made and the make
  875. # system is not used on the basis kernel. If updates are required
  876. # in the basis kernel ordinary make commands (without M=...) must
  877. # be used.
  878. #
  879. # The following are the only valid targets when building external
  880. # modules.
  881. # make M=dir clean Delete all automatically generated files
  882. # make M=dir modules Make all modules in specified dir
  883. # make M=dir Same as 'make M=dir modules'
  884. # make M=dir modules_install
  885. # Install the modules build in the module directory
  886. # Assumes install directory is already created
  887. # We are always building modules
  888. KBUILD_MODULES := 1
  889. PHONY += crmodverdir
  890. crmodverdir:
  891. $(Q)mkdir -p $(MODVERDIR)
  892. $(Q)rm -f $(MODVERDIR)/*
  893. PHONY += $(objtree)/Module.symvers
  894. $(objtree)/Module.symvers:
  895. @test -e $(objtree)/Module.symvers || ( \
  896. echo; \
  897. echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
  898. echo " is missing; modules will have no dependencies and modversions."; \
  899. echo )
  900. module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
  901. PHONY += $(module-dirs) modules
  902. $(module-dirs): crmodverdir $(objtree)/Module.symvers
  903. $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
  904. modules: $(module-dirs)
  905. @echo ' Building modules, stage 2.';
  906. $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
  907. PHONY += modules_install
  908. modules_install: _emodinst_ _emodinst_post
  909. install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
  910. PHONY += _emodinst_
  911. _emodinst_:
  912. $(Q)mkdir -p $(MODLIB)/$(install-dir)
  913. $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modinst
  914. # Run depmod only is we have System.map and depmod is executable
  915. quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
  916. cmd_depmod = if [ -r System.map -a -x $(DEPMOD) ]; then \
  917. $(DEPMOD) -ae -F System.map \
  918. $(if $(strip $(INSTALL_MOD_PATH)), \
  919. -b $(INSTALL_MOD_PATH) -r) \
  920. $(KERNELRELEASE); \
  921. fi
  922. PHONY += _emodinst_post
  923. _emodinst_post: _emodinst_
  924. $(call cmd,depmod)
  925. clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
  926. PHONY += $(clean-dirs) clean
  927. $(clean-dirs):
  928. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  929. clean: rm-dirs := $(MODVERDIR)
  930. clean: $(clean-dirs)
  931. $(call cmd,rmdirs)
  932. @find $(KBUILD_EXTMOD) $(RCS_FIND_IGNORE) \
  933. \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
  934. -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \) \
  935. -type f -print | xargs rm -f
  936. # Dummies...
  937. PHONY += prepare scripts
  938. prepare: ;
  939. scripts: ;
  940. endif # KBUILD_EXTMOD
  941. # Generate tags for editors
  942. # ---------------------------------------------------------------------------
  943. #We want __srctree to totally vanish out when KBUILD_OUTPUT is not set
  944. #(which is the most common case IMHO) to avoid unneeded clutter in the big tags file.
  945. #Adding $(srctree) adds about 20M on i386 to the size of the output file!
  946. ifeq ($(src),$(obj))
  947. __srctree =
  948. else
  949. __srctree = $(srctree)/
  950. endif
  951. ifeq ($(ALLSOURCE_ARCHS),)
  952. ifeq ($(ARCH),um)
  953. ALLINCLUDE_ARCHS := $(ARCH) $(SUBARCH)
  954. else
  955. ALLINCLUDE_ARCHS := $(ARCH)
  956. endif
  957. else
  958. #Allow user to specify only ALLSOURCE_PATHS on the command line, keeping existing behaviour.
  959. ALLINCLUDE_ARCHS := $(ALLSOURCE_ARCHS)
  960. endif
  961. ALLSOURCE_ARCHS := $(ARCH)
  962. define all-sources
  963. ( find -regex '.*\.[ch]$$' )
  964. endef
  965. quiet_cmd_cscope-file = FILELST cscope.files
  966. cmd_cscope-file = (echo \-k; echo \-q; $(all-sources)) > cscope.files
  967. quiet_cmd_cscope = MAKE cscope.out
  968. cmd_cscope = cscope -b
  969. cscope: FORCE
  970. $(call cmd,cscope-file)
  971. $(call cmd,cscope)
  972. quiet_cmd_TAGS = MAKE $@
  973. define cmd_TAGS
  974. rm -f $@; \
  975. ETAGSF=`etags --version | grep -i exuberant >/dev/null && \
  976. echo "-I __initdata,__exitdata,__acquires,__releases \
  977. -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
  978. --extra=+f --c-kinds=+px"`; \
  979. $(all-sources) | xargs etags $$ETAGSF -a
  980. endef
  981. TAGS: FORCE
  982. $(call cmd,TAGS)
  983. quiet_cmd_tags = MAKE $@
  984. define cmd_tags
  985. rm -f $@; \
  986. CTAGSF=`ctags --version | grep -i exuberant >/dev/null && \
  987. echo "-I __initdata,__exitdata,__acquires,__releases \
  988. -I EXPORT_SYMBOL,EXPORT_SYMBOL_GPL \
  989. --extra=+f --c-kinds=+px"`; \
  990. $(all-sources) | xargs ctags $$CTAGSF -a
  991. endef
  992. tags: FORCE
  993. $(call cmd,tags)
  994. # Scripts to check various things for consistency
  995. # ---------------------------------------------------------------------------
  996. includecheck:
  997. find * $(RCS_FIND_IGNORE) \
  998. -name '*.[hcS]' -type f -print | sort \
  999. | xargs $(PERL) -w scripts/checkincludes.pl
  1000. versioncheck:
  1001. find * $(RCS_FIND_IGNORE) \
  1002. -name '*.[hcS]' -type f -print | sort \
  1003. | xargs $(PERL) -w scripts/checkversion.pl
  1004. namespacecheck:
  1005. $(PERL) $(srctree)/scripts/namespace.pl
  1006. endif #ifeq ($(config-targets),1)
  1007. endif #ifeq ($(mixed-targets),1)
  1008. PHONY += checkstack
  1009. checkstack:
  1010. $(OBJDUMP) -d busybox $$(find . -name '*.ko') | \
  1011. $(PERL) $(src)/scripts/checkstack.pl $(ARCH)
  1012. kernelrelease:
  1013. $(if $(wildcard .kernelrelease), $(Q)echo $(KERNELRELEASE), \
  1014. $(error kernelrelease not valid - run 'make *config' to update it))
  1015. kernelversion:
  1016. @echo $(KERNELVERSION)
  1017. # Single targets
  1018. # ---------------------------------------------------------------------------
  1019. # Single targets are compatible with:
  1020. # - build whith mixed source and output
  1021. # - build with separate output dir 'make O=...'
  1022. # - external modules
  1023. #
  1024. # target-dir => where to store outputfile
  1025. # build-dir => directory in kernel source tree to use
  1026. ifeq ($(KBUILD_EXTMOD),)
  1027. build-dir = $(patsubst %/,%,$(dir $@))
  1028. target-dir = $(dir $@)
  1029. else
  1030. zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
  1031. build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
  1032. target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
  1033. endif
  1034. %.s: %.c prepare scripts FORCE
  1035. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1036. %.i: %.c prepare scripts FORCE
  1037. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1038. %.o: %.c prepare scripts FORCE
  1039. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1040. %.lst: %.c prepare scripts FORCE
  1041. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1042. %.s: %.S prepare scripts FORCE
  1043. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1044. %.o: %.S prepare scripts FORCE
  1045. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1046. # Modules
  1047. %/: prepare scripts FORCE
  1048. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1049. $(build)=$(build-dir)
  1050. /: prepare scripts FORCE
  1051. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1052. $(build)=$(build-dir)
  1053. %.ko: prepare scripts FORCE
  1054. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1055. $(build)=$(build-dir) $(@:.ko=.o)
  1056. $(Q)$(MAKE) -rR -f $(srctree)/scripts/Makefile.modpost
  1057. # FIXME Should go into a make.lib or something
  1058. # ===========================================================================
  1059. quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
  1060. cmd_rmdirs = rm -rf $(rm-dirs)
  1061. quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
  1062. cmd_rmfiles = rm -f $(rm-files)
  1063. a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \
  1064. $(NOSTDINC_FLAGS) $(CPPFLAGS) \
  1065. $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
  1066. quiet_cmd_as_o_S = AS $@
  1067. cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
  1068. # read all saved command lines
  1069. targets := $(wildcard $(sort $(targets)))
  1070. cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
  1071. ifneq ($(cmd_files),)
  1072. $(cmd_files): ; # Do not try to update included dependency files
  1073. include $(cmd_files)
  1074. endif
  1075. # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
  1076. # Usage:
  1077. # $(Q)$(MAKE) $(clean)=dir
  1078. clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
  1079. endif # skip-makefile
  1080. PHONY += FORCE
  1081. FORCE:
  1082. -include $(srctree)/Makefile.custom
  1083. # Declare the contents of the .PHONY variable as phony. We keep that
  1084. # information in a variable se we can use it in if_changed and friends.
  1085. .PHONY: $(PHONY)