Modifications to L4Linux.
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Makefile 61KB

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  1. # SPDX-License-Identifier: GPL-2.0
  2. VERSION = 4
  3. PATCHLEVEL = 17
  4. SUBLEVEL = 0
  5. EXTRAVERSION = -l4
  6. NAME = Merciless Moray
  7. # *DOCUMENTATION*
  8. # To see a list of typical targets execute "make help"
  9. # More info can be located in ./README
  10. # Comments in this file are targeted only to the developer, do not
  11. # expect to learn how to build the kernel reading this file.
  12. # That's our default target when none is given on the command line
  13. PHONY := _all
  14. _all:
  15. # o Do not use make's built-in rules and variables
  16. # (this increases performance and avoids hard-to-debug behaviour);
  17. # o Look for make include files relative to root of kernel src
  18. MAKEFLAGS += -rR --include-dir=$(CURDIR)
  19. # Avoid funny character set dependencies
  20. unexport LC_ALL
  21. LC_COLLATE=C
  22. LC_NUMERIC=C
  23. export LC_COLLATE LC_NUMERIC
  24. # Avoid interference with shell env settings
  25. unexport GREP_OPTIONS
  26. # We are using a recursive build, so we need to do a little thinking
  27. # to get the ordering right.
  28. #
  29. # Most importantly: sub-Makefiles should only ever modify files in
  30. # their own directory. If in some directory we have a dependency on
  31. # a file in another dir (which doesn't happen often, but it's often
  32. # unavoidable when linking the built-in.a targets which finally
  33. # turn into vmlinux), we will call a sub make in that other dir, and
  34. # after that we are sure that everything which is in that other dir
  35. # is now up to date.
  36. #
  37. # The only cases where we need to modify files which have global
  38. # effects are thus separated out and done before the recursive
  39. # descending is started. They are now explicitly listed as the
  40. # prepare rule.
  41. # Beautify output
  42. # ---------------------------------------------------------------------------
  43. #
  44. # Normally, we echo the whole command before executing it. By making
  45. # that echo $($(quiet)$(cmd)), we now have the possibility to set
  46. # $(quiet) to choose other forms of output instead, e.g.
  47. #
  48. # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
  49. # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  50. #
  51. # If $(quiet) is empty, the whole command will be printed.
  52. # If it is set to "quiet_", only the short version will be printed.
  53. # If it is set to "silent_", nothing will be printed at all, since
  54. # the variable $(silent_cmd_cc_o_c) doesn't exist.
  55. #
  56. # A simple variant is to prefix commands with $(Q) - that's useful
  57. # for commands that shall be hidden in non-verbose mode.
  58. #
  59. # $(Q)ln $@ :<
  60. #
  61. # If KBUILD_VERBOSE equals 0 then the above command will be hidden.
  62. # If KBUILD_VERBOSE equals 1 then the above command is displayed.
  63. #
  64. # To put more focus on warnings, be less verbose as default
  65. # Use 'make V=1' to see the full commands
  66. ifeq ("$(origin V)", "command line")
  67. KBUILD_VERBOSE = $(V)
  68. endif
  69. ifndef KBUILD_VERBOSE
  70. KBUILD_VERBOSE = 0
  71. endif
  72. ifeq ($(KBUILD_VERBOSE),1)
  73. quiet =
  74. Q =
  75. else
  76. quiet=quiet_
  77. Q = @
  78. endif
  79. # If the user is running make -s (silent mode), suppress echoing of
  80. # commands
  81. ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  82. quiet=silent_
  83. tools_silent=s
  84. endif
  85. export quiet Q KBUILD_VERBOSE
  86. # kbuild supports saving output files in a separate directory.
  87. # To locate output files in a separate directory two syntaxes are supported.
  88. # In both cases the working directory must be the root of the kernel src.
  89. # 1) O=
  90. # Use "make O=dir/to/store/output/files/"
  91. #
  92. # 2) Set KBUILD_OUTPUT
  93. # Set the environment variable KBUILD_OUTPUT to point to the directory
  94. # where the output files shall be placed.
  95. # export KBUILD_OUTPUT=dir/to/store/output/files/
  96. # make
  97. #
  98. # The O= assignment takes precedence over the KBUILD_OUTPUT environment
  99. # variable.
  100. # KBUILD_SRC is not intended to be used by the regular user (for now),
  101. # it is set on invocation of make with KBUILD_OUTPUT or O= specified.
  102. ifeq ($(KBUILD_SRC),)
  103. # OK, Make called in directory where kernel src resides
  104. # Do we want to locate output files in a separate directory?
  105. ifeq ("$(origin O)", "command line")
  106. KBUILD_OUTPUT := $(O)
  107. endif
  108. # Cancel implicit rules on top Makefile
  109. $(CURDIR)/Makefile Makefile: ;
  110. ifneq ($(words $(subst :, ,$(CURDIR))), 1)
  111. $(error main directory cannot contain spaces nor colons)
  112. endif
  113. ifneq ($(KBUILD_OUTPUT),)
  114. # check that the output directory actually exists
  115. saved-output := $(KBUILD_OUTPUT)
  116. KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
  117. && pwd)
  118. $(if $(KBUILD_OUTPUT),, \
  119. $(error failed to create output directory "$(saved-output)"))
  120. PHONY += $(MAKECMDGOALS) sub-make
  121. $(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
  122. @:
  123. # Invoke a second make in the output directory, passing relevant variables
  124. sub-make:
  125. $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
  126. -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
  127. # Leave processing to above invocation of make
  128. skip-makefile := 1
  129. endif # ifneq ($(KBUILD_OUTPUT),)
  130. endif # ifeq ($(KBUILD_SRC),)
  131. # We process the rest of the Makefile if this is the final invocation of make
  132. ifeq ($(skip-makefile),)
  133. # Do not print "Entering directory ...",
  134. # but we want to display it when entering to the output directory
  135. # so that IDEs/editors are able to understand relative filenames.
  136. MAKEFLAGS += --no-print-directory
  137. # Call a source code checker (by default, "sparse") as part of the
  138. # C compilation.
  139. #
  140. # Use 'make C=1' to enable checking of only re-compiled files.
  141. # Use 'make C=2' to enable checking of *all* source files, regardless
  142. # of whether they are re-compiled or not.
  143. #
  144. # See the file "Documentation/dev-tools/sparse.rst" for more details,
  145. # including where to get the "sparse" utility.
  146. ifeq ("$(origin C)", "command line")
  147. KBUILD_CHECKSRC = $(C)
  148. endif
  149. ifndef KBUILD_CHECKSRC
  150. KBUILD_CHECKSRC = 0
  151. endif
  152. # Use make M=dir to specify directory of external module to build
  153. # Old syntax make ... SUBDIRS=$PWD is still supported
  154. # Setting the environment variable KBUILD_EXTMOD take precedence
  155. ifdef SUBDIRS
  156. KBUILD_EXTMOD ?= $(SUBDIRS)
  157. endif
  158. ifeq ("$(origin M)", "command line")
  159. KBUILD_EXTMOD := $(M)
  160. endif
  161. ifeq ($(KBUILD_SRC),)
  162. # building in the source tree
  163. srctree := .
  164. else
  165. ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
  166. # building in a subdirectory of the source tree
  167. srctree := ..
  168. else
  169. srctree := $(KBUILD_SRC)
  170. endif
  171. endif
  172. export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
  173. objtree := .
  174. src := $(srctree)
  175. obj := $(objtree)
  176. VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
  177. include $(srctree)/arch/l4/Makefile.early
  178. export srctree objtree VPATH
  179. # To make sure we do not include .config for any of the *config targets
  180. # catch them early, and hand them over to scripts/kconfig/Makefile
  181. # It is allowed to specify more targets when calling make, including
  182. # mixing *config targets and build targets.
  183. # For example 'make oldconfig all'.
  184. # Detect when mixed targets is specified, and make a second invocation
  185. # of make so .config is not included in this case either (for *config).
  186. version_h := include/generated/uapi/linux/version.h
  187. old_version_h := include/linux/version.h
  188. clean-targets := %clean mrproper cleandocs
  189. no-dot-config-targets := $(clean-targets) \
  190. cscope gtags TAGS tags help% %docs check% coccicheck \
  191. $(version_h) headers_% archheaders archscripts \
  192. kernelversion %src-pkg
  193. config-targets := 0
  194. mixed-targets := 0
  195. dot-config := 1
  196. ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
  197. ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
  198. dot-config := 0
  199. endif
  200. endif
  201. ifeq ($(KBUILD_EXTMOD),)
  202. ifneq ($(filter config %config,$(MAKECMDGOALS)),)
  203. config-targets := 1
  204. ifneq ($(words $(MAKECMDGOALS)),1)
  205. mixed-targets := 1
  206. endif
  207. endif
  208. endif
  209. # For "make -j clean all", "make -j mrproper defconfig all", etc.
  210. ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
  211. ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
  212. mixed-targets := 1
  213. endif
  214. endif
  215. # install and modules_install need also be processed one by one
  216. ifneq ($(filter install,$(MAKECMDGOALS)),)
  217. ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
  218. mixed-targets := 1
  219. endif
  220. endif
  221. ifeq ($(mixed-targets),1)
  222. # ===========================================================================
  223. # We're called with mixed targets (*config and build targets).
  224. # Handle them one by one.
  225. PHONY += $(MAKECMDGOALS) __build_one_by_one
  226. $(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
  227. @:
  228. __build_one_by_one:
  229. $(Q)set -e; \
  230. for i in $(MAKECMDGOALS); do \
  231. $(MAKE) -f $(srctree)/Makefile $$i; \
  232. done
  233. else
  234. # We need some generic definitions (do not try to remake the file).
  235. scripts/Kbuild.include: ;
  236. include scripts/Kbuild.include
  237. # Read KERNELRELEASE from include/config/kernel.release (if it exists)
  238. KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
  239. KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
  240. export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
  241. # SUBARCH tells the usermode build what the underlying arch is. That is set
  242. # first, and if a usermode build is happening, the "ARCH=um" on the command
  243. # line overrides the setting of ARCH below. If a native build is happening,
  244. # then ARCH is assigned, getting whatever value it gets normally, and
  245. # SUBARCH is subsequently ignored.
  246. SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
  247. -e s/sun4u/sparc64/ \
  248. -e s/arm.*/arm/ -e s/sa110/arm/ \
  249. -e s/s390x/s390/ -e s/parisc64/parisc/ \
  250. -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
  251. -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
  252. -e s/riscv.*/riscv/)
  253. # Cross compiling and selecting different set of gcc/bin-utils
  254. # ---------------------------------------------------------------------------
  255. #
  256. # When performing cross compilation for other architectures ARCH shall be set
  257. # to the target architecture. (See arch/* for the possibilities).
  258. # ARCH can be set during invocation of make:
  259. # make ARCH=ia64
  260. # Another way is to have ARCH set in the environment.
  261. # The default ARCH is the host where make is executed.
  262. # CROSS_COMPILE specify the prefix used for all executables used
  263. # during compilation. Only gcc and related bin-utils executables
  264. # are prefixed with $(CROSS_COMPILE).
  265. # CROSS_COMPILE can be set on the command line
  266. # make CROSS_COMPILE=ia64-linux-
  267. # Alternatively CROSS_COMPILE can be set in the environment.
  268. # A third alternative is to store a setting in .config so that plain
  269. # "make" in the configured kernel build directory always uses that.
  270. # Default value for CROSS_COMPILE is not to prefix executables
  271. # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
  272. ARCH ?= $(SUBARCH)
  273. CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
  274. # Architecture as present in compile.h
  275. UTS_MACHINE := $(ARCH)
  276. SRCARCH := $(ARCH)
  277. # Additional ARCH settings for x86
  278. ifeq ($(ARCH),i386)
  279. SRCARCH := x86
  280. endif
  281. ifeq ($(ARCH),x86_64)
  282. SRCARCH := x86
  283. endif
  284. # Additional ARCH settings for sparc
  285. ifeq ($(ARCH),sparc32)
  286. SRCARCH := sparc
  287. endif
  288. ifeq ($(ARCH),sparc64)
  289. SRCARCH := sparc
  290. endif
  291. # Additional ARCH settings for sh
  292. ifeq ($(ARCH),sh64)
  293. SRCARCH := sh
  294. endif
  295. KCONFIG_CONFIG ?= .config
  296. export KCONFIG_CONFIG
  297. # SHELL used by kbuild
  298. CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
  299. else if [ -x /bin/bash ]; then echo /bin/bash; \
  300. else echo sh; fi ; fi)
  301. HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
  302. HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
  303. HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
  304. HOSTCC = gcc
  305. HOSTCXX = g++
  306. HOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
  307. -fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
  308. HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
  309. HOSTLDFLAGS := $(HOST_LFS_LDFLAGS)
  310. HOST_LOADLIBES := $(HOST_LFS_LIBS)
  311. # Make variables (CC, etc...)
  312. AS = $(CROSS_COMPILE)as
  313. LD = $(CROSS_COMPILE)ld
  314. CC = $(CROSS_COMPILE)gcc
  315. CPP = $(CC) -E
  316. AR = $(CROSS_COMPILE)ar
  317. NM = $(CROSS_COMPILE)nm
  318. STRIP = $(CROSS_COMPILE)strip
  319. OBJCOPY = $(CROSS_COMPILE)objcopy
  320. OBJDUMP = $(CROSS_COMPILE)objdump
  321. LEX = flex
  322. YACC = bison
  323. AWK = awk
  324. GENKSYMS = scripts/genksyms/genksyms
  325. INSTALLKERNEL := installkernel
  326. DEPMOD = /sbin/depmod
  327. PERL = perl
  328. PYTHON = python
  329. PYTHON2 = python2
  330. PYTHON3 = python3
  331. CHECK = sparse
  332. CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
  333. -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
  334. NOSTDINC_FLAGS =
  335. CFLAGS_MODULE =
  336. AFLAGS_MODULE =
  337. LDFLAGS_MODULE =
  338. CFLAGS_KERNEL =
  339. AFLAGS_KERNEL =
  340. LDFLAGS_vmlinux =
  341. # Use USERINCLUDE when you must reference the UAPI directories only.
  342. USERINCLUDE := \
  343. -I$(srctree)/arch/$(SRCARCH)/include/uapi \
  344. -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
  345. -I$(srctree)/include/uapi \
  346. -I$(objtree)/include/generated/uapi \
  347. -include $(srctree)/include/linux/kconfig.h
  348. # Use LINUXINCLUDE when you must reference the include/ directory.
  349. # Needed to be compatible with the O= option
  350. LINUXINCLUDE := \
  351. -I$(srctree)/arch/$(SRCARCH)/include \
  352. -I$(objtree)/arch/$(SRCARCH)/include/generated \
  353. $(if $(KBUILD_SRC), -I$(srctree)/include) \
  354. -I$(objtree)/include \
  355. $(USERINCLUDE)
  356. KBUILD_AFLAGS := -D__ASSEMBLY__
  357. KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
  358. -fno-strict-aliasing -fno-common -fshort-wchar \
  359. -Werror-implicit-function-declaration \
  360. -Wno-format-security \
  361. -std=gnu89
  362. KBUILD_CPPFLAGS := -D__KERNEL__
  363. KBUILD_AFLAGS_KERNEL :=
  364. KBUILD_CFLAGS_KERNEL :=
  365. KBUILD_AFLAGS_MODULE := -DMODULE
  366. KBUILD_CFLAGS_MODULE := -DMODULE
  367. KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
  368. LDFLAGS :=
  369. GCC_PLUGINS_CFLAGS :=
  370. export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
  371. export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
  372. export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
  373. export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
  374. export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
  375. export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
  376. export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
  377. export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
  378. export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
  379. export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
  380. export KBUILD_ARFLAGS
  381. # When compiling out-of-tree modules, put MODVERDIR in the module
  382. # tree rather than in the kernel tree. The kernel tree might
  383. # even be read-only.
  384. export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
  385. # Files to ignore in find ... statements
  386. export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
  387. -name CVS -o -name .pc -o -name .hg -o -name .git \) \
  388. -prune -o
  389. export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
  390. --exclude CVS --exclude .pc --exclude .hg --exclude .git
  391. # ===========================================================================
  392. # Rules shared between *config targets and build targets
  393. # Basic helpers built in scripts/basic/
  394. PHONY += scripts_basic
  395. scripts_basic:
  396. $(Q)$(MAKE) $(build)=scripts/basic
  397. $(Q)rm -f .tmp_quiet_recordmcount
  398. # To avoid any implicit rule to kick in, define an empty command.
  399. scripts/basic/%: scripts_basic ;
  400. PHONY += outputmakefile
  401. # outputmakefile generates a Makefile in the output directory, if using a
  402. # separate output directory. This allows convenient use of make in the
  403. # output directory.
  404. outputmakefile:
  405. ifneq ($(KBUILD_SRC),)
  406. $(Q)ln -fsn $(srctree) source
  407. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
  408. $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
  409. endif
  410. ifeq ($(cc-name),clang)
  411. ifneq ($(CROSS_COMPILE),)
  412. CLANG_TARGET := --target=$(notdir $(CROSS_COMPILE:%-=%))
  413. GCC_TOOLCHAIN := $(realpath $(dir $(shell which $(LD)))/..)
  414. endif
  415. ifneq ($(GCC_TOOLCHAIN),)
  416. CLANG_GCC_TC := --gcc-toolchain=$(GCC_TOOLCHAIN)
  417. endif
  418. KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
  419. KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
  420. KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
  421. KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
  422. endif
  423. RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
  424. RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
  425. RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
  426. export RETPOLINE_CFLAGS
  427. KBUILD_CFLAGS += $(call cc-option,-fno-PIE)
  428. KBUILD_AFLAGS += $(call cc-option,-fno-PIE)
  429. # check for 'asm goto'
  430. ifeq ($(call shell-cached,$(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
  431. CC_HAVE_ASM_GOTO := 1
  432. KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
  433. KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
  434. endif
  435. ifeq ($(config-targets),1)
  436. # ===========================================================================
  437. # *config targets only - make sure prerequisites are updated, and descend
  438. # in scripts/kconfig to make the *config target
  439. # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
  440. # KBUILD_DEFCONFIG may point out an alternative default configuration
  441. # used for 'make defconfig'
  442. include arch/$(SRCARCH)/Makefile
  443. export KBUILD_DEFCONFIG KBUILD_KCONFIG
  444. config: scripts_basic outputmakefile FORCE
  445. $(Q)$(MAKE) $(build)=scripts/kconfig $@
  446. %config: scripts_basic outputmakefile FORCE
  447. $(Q)$(MAKE) $(build)=scripts/kconfig $@
  448. else
  449. # ===========================================================================
  450. # Build targets only - this includes vmlinux, arch specific targets, clean
  451. # targets and others. In general all targets except *config targets.
  452. # If building an external module we do not care about the all: rule
  453. # but instead _all depend on modules
  454. PHONY += all
  455. ifeq ($(KBUILD_EXTMOD),)
  456. _all: all
  457. else
  458. _all: modules
  459. endif
  460. # Decide whether to build built-in, modular, or both.
  461. # Normally, just do built-in.
  462. KBUILD_MODULES :=
  463. KBUILD_BUILTIN := 1
  464. # If we have only "make modules", don't compile built-in objects.
  465. # When we're building modules with modversions, we need to consider
  466. # the built-in objects during the descend as well, in order to
  467. # make sure the checksums are up to date before we record them.
  468. ifeq ($(MAKECMDGOALS),modules)
  469. KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
  470. endif
  471. # If we have "make <whatever> modules", compile modules
  472. # in addition to whatever we do anyway.
  473. # Just "make" or "make all" shall build modules as well
  474. ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
  475. KBUILD_MODULES := 1
  476. endif
  477. ifeq ($(MAKECMDGOALS),)
  478. KBUILD_MODULES := 1
  479. endif
  480. export KBUILD_MODULES KBUILD_BUILTIN
  481. ifeq ($(KBUILD_EXTMOD),)
  482. # Objects we will link into vmlinux / subdirs we need to visit
  483. init-y := init/
  484. drivers-y := drivers/ sound/ firmware/
  485. net-y := net/
  486. libs-y := lib/
  487. core-y := usr/
  488. virt-y := virt/
  489. endif # KBUILD_EXTMOD
  490. ifeq ($(dot-config),1)
  491. # Read in config
  492. -include include/config/auto.conf
  493. ifeq ($(KBUILD_EXTMOD),)
  494. # Read in dependencies to all Kconfig* files, make sure to run
  495. # oldconfig if changes are detected.
  496. -include include/config/auto.conf.cmd
  497. # To avoid any implicit rule to kick in, define an empty command
  498. $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
  499. # The actual configuration files used during the build are stored in
  500. # include/generated/ and include/config/. Update them if .config is newer than
  501. # include/config/auto.conf (which mirrors .config).
  502. include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
  503. $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
  504. else
  505. # external modules needs include/generated/autoconf.h and include/config/auto.conf
  506. # but do not care if they are up-to-date. Use auto.conf to trigger the test
  507. PHONY += include/config/auto.conf
  508. include/config/auto.conf:
  509. $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
  510. echo >&2; \
  511. echo >&2 " ERROR: Kernel configuration is invalid."; \
  512. echo >&2 " include/generated/autoconf.h or $@ are missing.";\
  513. echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
  514. echo >&2 ; \
  515. /bin/false)
  516. endif # KBUILD_EXTMOD
  517. else
  518. # Dummy target needed, because used as prerequisite
  519. include/config/auto.conf: ;
  520. endif # $(dot-config)
  521. # The all: target is the default when no target is given on the
  522. # command line.
  523. # This allow a user to issue only 'make' to build a kernel including modules
  524. # Defaults to vmlinux, but the arch makefile usually adds further targets
  525. all: vmlinux
  526. CFLAGS_GCOV := -fprofile-arcs -ftest-coverage \
  527. $(call cc-option,-fno-tree-loop-im) \
  528. $(call cc-disable-warning,maybe-uninitialized,)
  529. export CFLAGS_GCOV CFLAGS_KCOV
  530. # The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
  531. # values of the respective KBUILD_* variables
  532. ARCH_CPPFLAGS :=
  533. ARCH_AFLAGS :=
  534. ARCH_CFLAGS :=
  535. include arch/$(SRCARCH)/Makefile
  536. KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
  537. KBUILD_CFLAGS += $(call cc-disable-warning,frame-address,)
  538. KBUILD_CFLAGS += $(call cc-disable-warning, format-truncation)
  539. KBUILD_CFLAGS += $(call cc-disable-warning, format-overflow)
  540. KBUILD_CFLAGS += $(call cc-disable-warning, int-in-bool-context)
  541. ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
  542. KBUILD_CFLAGS += $(call cc-option,-Oz,-Os)
  543. KBUILD_CFLAGS += $(call cc-disable-warning,maybe-uninitialized,)
  544. else
  545. ifdef CONFIG_PROFILE_ALL_BRANCHES
  546. KBUILD_CFLAGS += -O2 $(call cc-disable-warning,maybe-uninitialized,)
  547. else
  548. KBUILD_CFLAGS += -O2
  549. endif
  550. endif
  551. KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
  552. $(call cc-disable-warning,maybe-uninitialized,))
  553. # Tell gcc to never replace conditional load with a non-conditional one
  554. KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
  555. include scripts/Makefile.kcov
  556. include scripts/Makefile.gcc-plugins
  557. ifdef CONFIG_READABLE_ASM
  558. # Disable optimizations that make assembler listings hard to read.
  559. # reorder blocks reorders the control in the function
  560. # ipa clone creates specialized cloned functions
  561. # partial inlining inlines only parts of functions
  562. KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
  563. $(call cc-option,-fno-ipa-cp-clone,) \
  564. $(call cc-option,-fno-partial-inlining)
  565. endif
  566. ifneq ($(CONFIG_FRAME_WARN),0)
  567. KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
  568. endif
  569. # This selects the stack protector compiler flag. Testing it is delayed
  570. # until after .config has been reprocessed, in the prepare-compiler-check
  571. # target.
  572. ifdef CONFIG_CC_STACKPROTECTOR_AUTO
  573. stackp-flag := $(call cc-option,-fstack-protector-strong,$(call cc-option,-fstack-protector))
  574. stackp-name := AUTO
  575. else
  576. ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
  577. stackp-flag := -fstack-protector
  578. stackp-name := REGULAR
  579. else
  580. ifdef CONFIG_CC_STACKPROTECTOR_STRONG
  581. stackp-flag := -fstack-protector-strong
  582. stackp-name := STRONG
  583. else
  584. # If either there is no stack protector for this architecture or
  585. # CONFIG_CC_STACKPROTECTOR_NONE is selected, we're done, and $(stackp-name)
  586. # is empty, skipping all remaining stack protector tests.
  587. #
  588. # Force off for distro compilers that enable stack protector by default.
  589. KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
  590. endif
  591. endif
  592. endif
  593. # Find arch-specific stack protector compiler sanity-checking script.
  594. ifdef stackp-name
  595. ifneq ($(stackp-flag),)
  596. stackp-path := $(srctree)/scripts/gcc-$(SRCARCH)_$(BITS)-has-stack-protector.sh
  597. stackp-check := $(wildcard $(stackp-path))
  598. # If the wildcard test matches a test script, run it to check functionality.
  599. ifdef stackp-check
  600. ifneq ($(shell $(CONFIG_SHELL) $(stackp-check) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
  601. stackp-broken := y
  602. endif
  603. endif
  604. ifndef stackp-broken
  605. # If the stack protector is functional, enable code that depends on it.
  606. KBUILD_CPPFLAGS += -DCONFIG_CC_STACKPROTECTOR
  607. # Either we've already detected the flag (for AUTO) or we'll fail the
  608. # build in the prepare-compiler-check rule (for specific flag).
  609. KBUILD_CFLAGS += $(stackp-flag)
  610. else
  611. # We have to make sure stack protector is unconditionally disabled if
  612. # the compiler is broken (in case we're going to continue the build in
  613. # AUTO mode).
  614. KBUILD_CFLAGS += $(call cc-option, -fno-stack-protector)
  615. endif
  616. endif
  617. endif
  618. ifeq ($(cc-name),clang)
  619. KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
  620. KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
  621. KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
  622. KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
  623. # Quiet clang warning: comparison of unsigned expression < 0 is always false
  624. KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
  625. # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
  626. # source of a reference will be _MergedGlobals and not on of the whitelisted names.
  627. # See modpost pattern 2
  628. KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
  629. KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
  630. else
  631. # These warnings generated too much noise in a regular build.
  632. # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
  633. KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
  634. endif
  635. KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
  636. ifdef CONFIG_FRAME_POINTER
  637. KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
  638. else
  639. # Some targets (ARM with Thumb2, for example), can't be built with frame
  640. # pointers. For those, we don't have FUNCTION_TRACER automatically
  641. # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
  642. # incompatible with -fomit-frame-pointer with current GCC, so we don't use
  643. # -fomit-frame-pointer with FUNCTION_TRACER.
  644. ifndef CONFIG_FUNCTION_TRACER
  645. KBUILD_CFLAGS += -fomit-frame-pointer
  646. endif
  647. endif
  648. KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
  649. ifdef CONFIG_DEBUG_INFO
  650. ifdef CONFIG_DEBUG_INFO_SPLIT
  651. KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
  652. else
  653. KBUILD_CFLAGS += -g
  654. endif
  655. KBUILD_AFLAGS += -Wa,-gdwarf-2
  656. endif
  657. ifdef CONFIG_DEBUG_INFO_DWARF4
  658. KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
  659. endif
  660. ifdef CONFIG_DEBUG_INFO_REDUCED
  661. KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
  662. $(call cc-option,-fno-var-tracking)
  663. endif
  664. ifdef CONFIG_FUNCTION_TRACER
  665. ifndef CC_FLAGS_FTRACE
  666. CC_FLAGS_FTRACE := -pg
  667. endif
  668. export CC_FLAGS_FTRACE
  669. ifdef CONFIG_HAVE_FENTRY
  670. CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
  671. endif
  672. KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
  673. KBUILD_AFLAGS += $(CC_USING_FENTRY)
  674. ifdef CONFIG_DYNAMIC_FTRACE
  675. ifdef CONFIG_HAVE_C_RECORDMCOUNT
  676. BUILD_C_RECORDMCOUNT := y
  677. export BUILD_C_RECORDMCOUNT
  678. endif
  679. endif
  680. endif
  681. # We trigger additional mismatches with less inlining
  682. ifdef CONFIG_DEBUG_SECTION_MISMATCH
  683. KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
  684. endif
  685. ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  686. KBUILD_CFLAGS += $(call cc-option,-ffunction-sections,)
  687. KBUILD_CFLAGS += $(call cc-option,-fdata-sections,)
  688. endif
  689. # arch Makefile may override CC so keep this after arch Makefile is included
  690. NOSTDINC_FLAGS += -nostdinc -isystem $(call shell-cached,$(CC) -print-file-name=include)
  691. CHECKFLAGS += $(NOSTDINC_FLAGS)
  692. # warn about C99 declaration after statement
  693. KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
  694. # disable pointer signed / unsigned warnings in gcc 4.0
  695. KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
  696. # disable invalid "can't wrap" optimizations for signed / pointers
  697. KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
  698. # clang sets -fmerge-all-constants by default as optimization, but this
  699. # is non-conforming behavior for C and in fact breaks the kernel, so we
  700. # need to disable it here generally.
  701. KBUILD_CFLAGS += $(call cc-option,-fno-merge-all-constants)
  702. # for gcc -fno-merge-all-constants disables everything, but it is fine
  703. # to have actual conforming behavior enabled.
  704. KBUILD_CFLAGS += $(call cc-option,-fmerge-constants)
  705. # Make sure -fstack-check isn't enabled (like gentoo apparently did)
  706. KBUILD_CFLAGS += $(call cc-option,-fno-stack-check,)
  707. # conserve stack if available
  708. KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
  709. # disallow errors like 'EXPORT_GPL(foo);' with missing header
  710. KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
  711. # require functions to have arguments in prototypes, not empty 'int foo()'
  712. KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
  713. # Prohibit date/time macros, which would make the build non-deterministic
  714. KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
  715. # enforce correct pointer usage
  716. KBUILD_CFLAGS += $(call cc-option,-Werror=incompatible-pointer-types)
  717. # Require designated initializers for all marked structures
  718. KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
  719. # change __FILE__ to the relative path from the srctree
  720. KBUILD_CFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
  721. # use the deterministic mode of AR if available
  722. KBUILD_ARFLAGS := $(call ar-option,D)
  723. include scripts/Makefile.kasan
  724. include scripts/Makefile.extrawarn
  725. include scripts/Makefile.ubsan
  726. # Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
  727. # last assignments
  728. KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
  729. KBUILD_AFLAGS += $(ARCH_AFLAGS) $(KAFLAGS)
  730. KBUILD_CFLAGS += $(ARCH_CFLAGS) $(KCFLAGS)
  731. # Use --build-id when available.
  732. LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
  733. KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
  734. LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
  735. ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
  736. LDFLAGS_vmlinux += $(call ld-option, --gc-sections,)
  737. endif
  738. ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
  739. LDFLAGS_vmlinux += $(call ld-option, -X,)
  740. endif
  741. # Default kernel image to build when no specific target is given.
  742. # KBUILD_IMAGE may be overruled on the command line or
  743. # set in the environment
  744. # Also any assignments in arch/$(ARCH)/Makefile take precedence over
  745. # this default value
  746. export KBUILD_IMAGE ?= vmlinux
  747. #
  748. # INSTALL_PATH specifies where to place the updated kernel and system map
  749. # images. Default is /boot, but you can set it to other values
  750. export INSTALL_PATH ?= /boot
  751. #
  752. # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
  753. # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
  754. # an argument if needed. Otherwise it defaults to the kernel install path
  755. #
  756. export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
  757. #
  758. # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
  759. # relocations required by build roots. This is not defined in the
  760. # makefile but the argument can be passed to make if needed.
  761. #
  762. MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
  763. export MODLIB
  764. #
  765. # INSTALL_MOD_STRIP, if defined, will cause modules to be
  766. # stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
  767. # the default option --strip-debug will be used. Otherwise,
  768. # INSTALL_MOD_STRIP value will be used as the options to the strip command.
  769. ifdef INSTALL_MOD_STRIP
  770. ifeq ($(INSTALL_MOD_STRIP),1)
  771. mod_strip_cmd = $(STRIP) --strip-debug
  772. else
  773. mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
  774. endif # INSTALL_MOD_STRIP=1
  775. else
  776. mod_strip_cmd = true
  777. endif # INSTALL_MOD_STRIP
  778. export mod_strip_cmd
  779. # CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
  780. # after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
  781. # or CONFIG_MODULE_COMPRESS_XZ.
  782. mod_compress_cmd = true
  783. ifdef CONFIG_MODULE_COMPRESS
  784. ifdef CONFIG_MODULE_COMPRESS_GZIP
  785. mod_compress_cmd = gzip -n -f
  786. endif # CONFIG_MODULE_COMPRESS_GZIP
  787. ifdef CONFIG_MODULE_COMPRESS_XZ
  788. mod_compress_cmd = xz -f
  789. endif # CONFIG_MODULE_COMPRESS_XZ
  790. endif # CONFIG_MODULE_COMPRESS
  791. export mod_compress_cmd
  792. # Select initial ramdisk compression format, default is gzip(1).
  793. # This shall be used by the dracut(8) tool while creating an initramfs image.
  794. #
  795. INITRD_COMPRESS-y := gzip
  796. INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
  797. INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
  798. INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
  799. INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
  800. INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
  801. # do not export INITRD_COMPRESS, since we didn't actually
  802. # choose a sane default compression above.
  803. # export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
  804. ifdef CONFIG_MODULE_SIG_ALL
  805. $(eval $(call config_filename,MODULE_SIG_KEY))
  806. mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
  807. else
  808. mod_sign_cmd = true
  809. endif
  810. export mod_sign_cmd
  811. ifdef CONFIG_STACK_VALIDATION
  812. has_libelf := $(call try-run,\
  813. echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
  814. ifeq ($(has_libelf),1)
  815. objtool_target := tools/objtool FORCE
  816. else
  817. ifdef CONFIG_UNWINDER_ORC
  818. $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
  819. else
  820. $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
  821. endif
  822. SKIP_STACK_VALIDATION := 1
  823. export SKIP_STACK_VALIDATION
  824. endif
  825. endif
  826. ifeq ($(KBUILD_EXTMOD),)
  827. core-y += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
  828. vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
  829. $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
  830. $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
  831. vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
  832. $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
  833. init-y := $(patsubst %/, %/built-in.a, $(init-y))
  834. core-y := $(patsubst %/, %/built-in.a, $(core-y))
  835. drivers-y := $(patsubst %/, %/built-in.a, $(drivers-y))
  836. net-y := $(patsubst %/, %/built-in.a, $(net-y))
  837. libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
  838. libs-y2 := $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
  839. virt-y := $(patsubst %/, %/built-in.a, $(virt-y))
  840. # Externally visible symbols (used by link-vmlinux.sh)
  841. export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
  842. export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
  843. export KBUILD_VMLINUX_LIBS := $(libs-y1)
  844. export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
  845. export LDFLAGS_vmlinux
  846. # used by scripts/package/Makefile
  847. export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
  848. vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
  849. # Recurse until adjust_autoksyms.sh is satisfied
  850. PHONY += autoksyms_recursive
  851. autoksyms_recursive: $(vmlinux-deps)
  852. ifdef CONFIG_TRIM_UNUSED_KSYMS
  853. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
  854. "$(MAKE) -f $(srctree)/Makefile vmlinux"
  855. endif
  856. # For the kernel to actually contain only the needed exported symbols,
  857. # we have to build modules as well to determine what those symbols are.
  858. # (this can be evaluated only once include/config/auto.conf has been included)
  859. ifdef CONFIG_TRIM_UNUSED_KSYMS
  860. KBUILD_MODULES := 1
  861. endif
  862. autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
  863. $(autoksyms_h):
  864. $(Q)mkdir -p $(dir $@)
  865. $(Q)touch $@
  866. ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
  867. # Final link of vmlinux with optional arch pass after final link
  868. cmd_link-vmlinux = \
  869. $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ; \
  870. $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
  871. vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
  872. ifdef CONFIG_HEADERS_CHECK
  873. $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
  874. endif
  875. ifdef CONFIG_GDB_SCRIPTS
  876. $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
  877. endif
  878. +$(call if_changed,link-vmlinux)
  879. # Build samples along the rest of the kernel
  880. ifdef CONFIG_SAMPLES
  881. vmlinux-dirs += samples
  882. endif
  883. # The actual objects are generated when descending,
  884. # make sure no implicit rule kicks in
  885. $(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
  886. # Handle descending into subdirectories listed in $(vmlinux-dirs)
  887. # Preset locale variables to speed up the build process. Limit locale
  888. # tweaks to this spot to avoid wrong language settings when running
  889. # make menuconfig etc.
  890. # Error messages still appears in the original language
  891. PHONY += $(vmlinux-dirs)
  892. $(vmlinux-dirs): prepare scripts
  893. $(Q)$(MAKE) $(build)=$@ need-builtin=1
  894. define filechk_kernel.release
  895. echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
  896. endef
  897. # Store (new) KERNELRELEASE string in include/config/kernel.release
  898. include/config/kernel.release: include/config/auto.conf FORCE
  899. $(call filechk,kernel.release)
  900. # Additional helpers built in scripts/
  901. # Carefully list dependencies so we do not try to build scripts twice
  902. # in parallel
  903. PHONY += scripts
  904. scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
  905. asm-generic gcc-plugins $(autoksyms_h)
  906. $(Q)$(MAKE) $(build)=$(@)
  907. # Things we need to do before we recursively start building the kernel
  908. # or the modules are listed in "prepare".
  909. # A multi level approach is used. prepareN is processed before prepareN-1.
  910. # archprepare is used in arch Makefiles and when processed asm symlink,
  911. # version.h and scripts_basic is processed / created.
  912. # Listed in dependency order
  913. PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
  914. # prepare3 is used to check if we are building in a separate output directory,
  915. # and if so do:
  916. # 1) Check that make has not been executed in the kernel src $(srctree)
  917. prepare3: include/config/kernel.release
  918. ifneq ($(KBUILD_SRC),)
  919. @$(kecho) ' Using $(srctree) as source for kernel'
  920. $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
  921. echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
  922. echo >&2 " in the '$(srctree)' directory.";\
  923. /bin/false; \
  924. fi;
  925. endif
  926. # prepare2 creates a makefile if using a separate output directory.
  927. # From this point forward, .config has been reprocessed, so any rules
  928. # that need to depend on updated CONFIG_* values can be checked here.
  929. prepare2: prepare3 prepare-compiler-check outputmakefile asm-generic
  930. prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
  931. include/config/auto.conf
  932. $(cmd_crmodverdir)
  933. archprepare: archheaders archscripts prepare1 scripts_basic
  934. prepare0: archprepare gcc-plugins
  935. $(Q)$(MAKE) $(build)=.
  936. # All the preparing..
  937. prepare: prepare0 prepare-objtool
  938. # Support for using generic headers in asm-generic
  939. PHONY += asm-generic uapi-asm-generic
  940. asm-generic: uapi-asm-generic
  941. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  942. src=asm obj=arch/$(SRCARCH)/include/generated/asm
  943. uapi-asm-generic:
  944. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
  945. src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
  946. PHONY += prepare-objtool
  947. prepare-objtool: $(objtool_target)
  948. # Check for CONFIG flags that require compiler support. Abort the build
  949. # after .config has been processed, but before the kernel build starts.
  950. #
  951. # For security-sensitive CONFIG options, we don't want to fallback and/or
  952. # silently change which compiler flags will be used, since that leads to
  953. # producing kernels with different security feature characteristics
  954. # depending on the compiler used. (For example, "But I selected
  955. # CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
  956. PHONY += prepare-compiler-check
  957. prepare-compiler-check: FORCE
  958. # Make sure compiler supports requested stack protector flag.
  959. ifdef stackp-name
  960. # Warn about CONFIG_CC_STACKPROTECTOR_AUTO having found no option.
  961. ifeq ($(stackp-flag),)
  962. @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
  963. Compiler does not support any known stack-protector >&2
  964. else
  965. # Fail if specifically requested stack protector is missing.
  966. ifeq ($(call cc-option, $(stackp-flag)),)
  967. @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
  968. $(stackp-flag) not supported by compiler >&2 && exit 1
  969. endif
  970. endif
  971. endif
  972. # Make sure compiler does not have buggy stack-protector support. If a
  973. # specific stack-protector was requested, fail the build, otherwise warn.
  974. ifdef stackp-broken
  975. ifeq ($(stackp-name),AUTO)
  976. @echo CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
  977. $(stackp-flag) available but compiler is broken: disabling >&2
  978. else
  979. @echo Cannot use CONFIG_CC_STACKPROTECTOR_$(stackp-name): \
  980. $(stackp-flag) available but compiler is broken >&2 && exit 1
  981. endif
  982. endif
  983. @:
  984. # Generate some files
  985. # ---------------------------------------------------------------------------
  986. # KERNELRELEASE can change from a few different places, meaning version.h
  987. # needs to be updated, so this check is forced on all builds
  988. uts_len := 64
  989. define filechk_utsrelease.h
  990. if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
  991. echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
  992. exit 1; \
  993. fi; \
  994. (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
  995. endef
  996. define filechk_version.h
  997. (echo \#define LINUX_VERSION_CODE $(shell \
  998. expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
  999. echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
  1000. endef
  1001. $(version_h): $(srctree)/Makefile FORCE
  1002. $(call filechk,version.h)
  1003. $(Q)rm -f $(old_version_h)
  1004. include/generated/utsrelease.h: include/config/kernel.release FORCE
  1005. $(call filechk,utsrelease.h)
  1006. PHONY += headerdep
  1007. headerdep:
  1008. $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
  1009. $(srctree)/scripts/headerdep.pl -I$(srctree)/include
  1010. # ---------------------------------------------------------------------------
  1011. # Kernel headers
  1012. #Default location for installed headers
  1013. export INSTALL_HDR_PATH = $(objtree)/usr
  1014. # If we do an all arch process set dst to include/arch-$(SRCARCH)
  1015. hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
  1016. PHONY += archheaders
  1017. archheaders:
  1018. PHONY += archscripts
  1019. archscripts:
  1020. PHONY += __headers
  1021. __headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
  1022. $(Q)$(MAKE) $(build)=scripts build_unifdef
  1023. PHONY += headers_install_all
  1024. headers_install_all:
  1025. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
  1026. PHONY += headers_install
  1027. headers_install: __headers
  1028. $(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
  1029. $(error Headers not exportable for the $(SRCARCH) architecture))
  1030. $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
  1031. $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
  1032. PHONY += headers_check_all
  1033. headers_check_all: headers_install_all
  1034. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
  1035. PHONY += headers_check
  1036. headers_check: headers_install
  1037. $(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
  1038. $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
  1039. # ---------------------------------------------------------------------------
  1040. # Kernel selftest
  1041. PHONY += kselftest
  1042. kselftest:
  1043. $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
  1044. PHONY += kselftest-clean
  1045. kselftest-clean:
  1046. $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
  1047. PHONY += kselftest-merge
  1048. kselftest-merge:
  1049. $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
  1050. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
  1051. -m $(objtree)/.config \
  1052. $(srctree)/tools/testing/selftests/*/config
  1053. +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
  1054. # ---------------------------------------------------------------------------
  1055. # Modules
  1056. ifdef CONFIG_MODULES
  1057. # By default, build modules as well
  1058. all: modules
  1059. # Build modules
  1060. #
  1061. # A module can be listed more than once in obj-m resulting in
  1062. # duplicate lines in modules.order files. Those are removed
  1063. # using awk while concatenating to the final file.
  1064. PHONY += modules
  1065. modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
  1066. $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
  1067. @$(kecho) ' Building modules, stage 2.';
  1068. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  1069. modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
  1070. $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
  1071. %/modules.builtin: include/config/auto.conf
  1072. $(Q)$(MAKE) $(modbuiltin)=$*
  1073. # Target to prepare building external modules
  1074. PHONY += modules_prepare
  1075. modules_prepare: prepare scripts
  1076. # Target to install modules
  1077. PHONY += modules_install
  1078. modules_install: _modinst_ _modinst_post
  1079. PHONY += _modinst_
  1080. _modinst_:
  1081. @rm -rf $(MODLIB)/kernel
  1082. @rm -f $(MODLIB)/source
  1083. @mkdir -p $(MODLIB)/kernel
  1084. @ln -s $(abspath $(srctree)) $(MODLIB)/source
  1085. @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
  1086. rm -f $(MODLIB)/build ; \
  1087. ln -s $(CURDIR) $(MODLIB)/build ; \
  1088. fi
  1089. @cp -f $(objtree)/modules.order $(MODLIB)/
  1090. @cp -f $(objtree)/modules.builtin $(MODLIB)/
  1091. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  1092. # This depmod is only for convenience to give the initial
  1093. # boot a modules.dep even before / is mounted read-write. However the
  1094. # boot script depmod is the master version.
  1095. PHONY += _modinst_post
  1096. _modinst_post: _modinst_
  1097. $(call cmd,depmod)
  1098. ifeq ($(CONFIG_MODULE_SIG), y)
  1099. PHONY += modules_sign
  1100. modules_sign:
  1101. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
  1102. endif
  1103. else # CONFIG_MODULES
  1104. # Modules not configured
  1105. # ---------------------------------------------------------------------------
  1106. PHONY += modules modules_install
  1107. modules modules_install:
  1108. @echo >&2
  1109. @echo >&2 "The present kernel configuration has modules disabled."
  1110. @echo >&2 "Type 'make config' and enable loadable module support."
  1111. @echo >&2 "Then build a kernel with module support enabled."
  1112. @echo >&2
  1113. @exit 1
  1114. endif # CONFIG_MODULES
  1115. ###
  1116. # Cleaning is done on three levels.
  1117. # make clean Delete most generated files
  1118. # Leave enough to build external modules
  1119. # make mrproper Delete the current configuration, and all generated files
  1120. # make distclean Remove editor backup files, patch leftover files and the like
  1121. # Directories & files removed with 'make clean'
  1122. CLEAN_DIRS += $(MODVERDIR) include/ksym
  1123. # Directories & files removed with 'make mrproper'
  1124. MRPROPER_DIRS += include/config usr/include include/generated \
  1125. arch/*/include/generated .tmp_objdiff
  1126. MRPROPER_FILES += .config .config.old .version \
  1127. Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
  1128. signing_key.pem signing_key.priv signing_key.x509 \
  1129. x509.genkey extra_certificates signing_key.x509.keyid \
  1130. signing_key.x509.signer vmlinux-gdb.py
  1131. # clean - Delete most, but leave enough to build external modules
  1132. #
  1133. clean: rm-dirs := $(CLEAN_DIRS)
  1134. clean: rm-files := $(CLEAN_FILES)
  1135. clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
  1136. PHONY += $(clean-dirs) clean archclean vmlinuxclean
  1137. $(clean-dirs):
  1138. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  1139. vmlinuxclean:
  1140. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
  1141. $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
  1142. clean: archclean vmlinuxclean
  1143. # mrproper - Delete all generated files, including .config
  1144. #
  1145. mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
  1146. mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
  1147. mrproper-dirs := $(addprefix _mrproper_,scripts)
  1148. PHONY += $(mrproper-dirs) mrproper archmrproper
  1149. $(mrproper-dirs):
  1150. $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
  1151. mrproper: clean archmrproper $(mrproper-dirs)
  1152. $(call cmd,rmdirs)
  1153. $(call cmd,rmfiles)
  1154. # distclean
  1155. #
  1156. PHONY += distclean
  1157. distclean: mrproper
  1158. @find $(srctree) $(RCS_FIND_IGNORE) \
  1159. \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
  1160. -o -name '*.bak' -o -name '#*#' -o -name '*%' \
  1161. -o -name 'core' \) \
  1162. -type f -print | xargs rm -f
  1163. # Packaging of the kernel to various formats
  1164. # ---------------------------------------------------------------------------
  1165. # rpm target kept for backward compatibility
  1166. package-dir := scripts/package
  1167. %src-pkg: FORCE
  1168. $(Q)$(MAKE) $(build)=$(package-dir) $@
  1169. %pkg: include/config/kernel.release FORCE
  1170. $(Q)$(MAKE) $(build)=$(package-dir) $@
  1171. rpm: rpm-pkg
  1172. @echo " WARNING: \"rpm\" target will be removed after Linux 4.18"
  1173. @echo " Please use \"rpm-pkg\" instead."
  1174. # Brief documentation of the typical targets used
  1175. # ---------------------------------------------------------------------------
  1176. boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
  1177. boards := $(sort $(notdir $(boards)))
  1178. board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
  1179. board-dirs := $(sort $(notdir $(board-dirs:/=)))
  1180. PHONY += help
  1181. help:
  1182. @echo 'Cleaning targets:'
  1183. @echo ' clean - Remove most generated files but keep the config and'
  1184. @echo ' enough build support to build external modules'
  1185. @echo ' mrproper - Remove all generated files + config + various backup files'
  1186. @echo ' distclean - mrproper + remove editor backup and patch files'
  1187. @echo ''
  1188. @echo 'Configuration targets:'
  1189. @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
  1190. @echo ''
  1191. @echo 'Other generic targets:'
  1192. @echo ' all - Build all targets marked with [*]'
  1193. @echo '* vmlinux - Build the bare kernel'
  1194. @echo '* modules - Build all modules'
  1195. @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
  1196. @echo ' dir/ - Build all files in dir and below'
  1197. @echo ' dir/file.[ois] - Build specified target only'
  1198. @echo ' dir/file.ll - Build the LLVM assembly file'
  1199. @echo ' (requires compiler support for LLVM assembly generation)'
  1200. @echo ' dir/file.lst - Build specified mixed source/assembly target only'
  1201. @echo ' (requires a recent binutils and recent build (System.map))'
  1202. @echo ' dir/file.ko - Build module including final link'
  1203. @echo ' modules_prepare - Set up for building external modules'
  1204. @echo ' tags/TAGS - Generate tags file for editors'
  1205. @echo ' cscope - Generate cscope index'
  1206. @echo ' gtags - Generate GNU GLOBAL index'
  1207. @echo ' kernelrelease - Output the release version string (use with make -s)'
  1208. @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
  1209. @echo ' image_name - Output the image name (use with make -s)'
  1210. @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
  1211. echo ' (default: $(INSTALL_HDR_PATH))'; \
  1212. echo ''
  1213. @echo 'Static analysers:'
  1214. @echo ' checkstack - Generate a list of stack hogs'
  1215. @echo ' namespacecheck - Name space analysis on compiled kernel'
  1216. @echo ' versioncheck - Sanity check on version.h usage'
  1217. @echo ' includecheck - Check for duplicate included header files'
  1218. @echo ' export_report - List the usages of all exported symbols'
  1219. @echo ' headers_check - Sanity check on exported headers'
  1220. @echo ' headerdep - Detect inclusion cycles in headers'
  1221. @echo ' coccicheck - Check with Coccinelle'
  1222. @echo ''
  1223. @echo 'Kernel selftest:'
  1224. @echo ' kselftest - Build and run kernel selftest (run as root)'
  1225. @echo ' Build, install, and boot kernel before'
  1226. @echo ' running kselftest on it'
  1227. @echo ' kselftest-clean - Remove all generated kselftest files'
  1228. @echo ' kselftest-merge - Merge all the config dependencies of kselftest to existing'
  1229. @echo ' .config.'
  1230. @echo ''
  1231. @echo 'Userspace tools targets:'
  1232. @echo ' use "make tools/help"'
  1233. @echo ' or "cd tools; make help"'
  1234. @echo ''
  1235. @echo 'Kernel packaging:'
  1236. @$(MAKE) $(build)=$(package-dir) help
  1237. @echo ''
  1238. @echo 'Documentation targets:'
  1239. @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
  1240. @echo ''
  1241. @echo 'Architecture specific targets ($(SRCARCH)):'
  1242. @$(if $(archhelp),$(archhelp),\
  1243. echo ' No architecture specific help defined for $(SRCARCH)')
  1244. @echo ''
  1245. @$(if $(boards), \
  1246. $(foreach b, $(boards), \
  1247. printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
  1248. echo '')
  1249. @$(if $(board-dirs), \
  1250. $(foreach b, $(board-dirs), \
  1251. printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
  1252. printf " %-16s - Show all of the above\\n" help-boards; \
  1253. echo '')
  1254. @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
  1255. @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
  1256. @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
  1257. @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK (sparse by default)'
  1258. @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
  1259. @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
  1260. @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
  1261. @echo ' 1: warnings which may be relevant and do not occur too often'
  1262. @echo ' 2: warnings which occur quite often but may still be relevant'
  1263. @echo ' 3: more obscure warnings, can most likely be ignored'
  1264. @echo ' Multiple levels can be combined with W=12 or W=123'
  1265. @echo ''
  1266. @echo 'Execute "make" or "make all" to build all targets marked with [*] '
  1267. @echo 'For further info see the ./README file'
  1268. help-board-dirs := $(addprefix help-,$(board-dirs))
  1269. help-boards: $(help-board-dirs)
  1270. boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
  1271. $(help-board-dirs): help-%:
  1272. @echo 'Architecture specific targets ($(SRCARCH) $*):'
  1273. @$(if $(boards-per-dir), \
  1274. $(foreach b, $(boards-per-dir), \
  1275. printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
  1276. echo '')
  1277. # Documentation targets
  1278. # ---------------------------------------------------------------------------
  1279. DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
  1280. linkcheckdocs dochelp refcheckdocs
  1281. PHONY += $(DOC_TARGETS)
  1282. $(DOC_TARGETS): scripts_basic FORCE
  1283. $(Q)$(MAKE) $(build)=Documentation $@
  1284. else # KBUILD_EXTMOD
  1285. ###
  1286. # External module support.
  1287. # When building external modules the kernel used as basis is considered
  1288. # read-only, and no consistency checks are made and the make
  1289. # system is not used on the basis kernel. If updates are required
  1290. # in the basis kernel ordinary make commands (without M=...) must
  1291. # be used.
  1292. #
  1293. # The following are the only valid targets when building external
  1294. # modules.
  1295. # make M=dir clean Delete all automatically generated files
  1296. # make M=dir modules Make all modules in specified dir
  1297. # make M=dir Same as 'make M=dir modules'
  1298. # make M=dir modules_install
  1299. # Install the modules built in the module directory
  1300. # Assumes install directory is already created
  1301. # We are always building modules
  1302. KBUILD_MODULES := 1
  1303. PHONY += crmodverdir
  1304. crmodverdir:
  1305. $(cmd_crmodverdir)
  1306. PHONY += $(objtree)/Module.symvers
  1307. $(objtree)/Module.symvers:
  1308. @test -e $(objtree)/Module.symvers || ( \
  1309. echo; \
  1310. echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
  1311. echo " is missing; modules will have no dependencies and modversions."; \
  1312. echo )
  1313. module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
  1314. PHONY += $(module-dirs) modules
  1315. $(module-dirs): crmodverdir $(objtree)/Module.symvers
  1316. $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
  1317. modules: $(module-dirs)
  1318. @$(kecho) ' Building modules, stage 2.';
  1319. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  1320. PHONY += modules_install
  1321. modules_install: _emodinst_ _emodinst_post
  1322. install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
  1323. PHONY += _emodinst_
  1324. _emodinst_:
  1325. $(Q)mkdir -p $(MODLIB)/$(install-dir)
  1326. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
  1327. PHONY += _emodinst_post
  1328. _emodinst_post: _emodinst_
  1329. $(call cmd,depmod)
  1330. clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
  1331. PHONY += $(clean-dirs) clean
  1332. $(clean-dirs):
  1333. $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
  1334. clean: rm-dirs := $(MODVERDIR)
  1335. clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
  1336. PHONY += help
  1337. help:
  1338. @echo ' Building external modules.'
  1339. @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
  1340. @echo ''
  1341. @echo ' modules - default target, build the module(s)'
  1342. @echo ' modules_install - install the module'
  1343. @echo ' clean - remove generated files in module directory only'
  1344. @echo ''
  1345. # Dummies...
  1346. PHONY += prepare scripts
  1347. prepare: ;
  1348. scripts: ;
  1349. endif # KBUILD_EXTMOD
  1350. clean: $(clean-dirs)
  1351. $(call cmd,rmdirs)
  1352. $(call cmd,rmfiles)
  1353. @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
  1354. \( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
  1355. -o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
  1356. -o -name '*.dwo' -o -name '*.lst' \
  1357. -o -name '*.su' \
  1358. -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
  1359. -o -name '*.lex.c' -o -name '*.tab.[ch]' \
  1360. -o -name '*.asn1.[ch]' \
  1361. -o -name '*.symtypes' -o -name 'modules.order' \
  1362. -o -name modules.builtin -o -name '.tmp_*.o.*' \
  1363. -o -name .cache.mk \
  1364. -o -name '*.c.[012]*.*' \
  1365. -o -name '*.ll' \
  1366. -o -name '*.gcno' \) -type f -print | xargs rm -f
  1367. # Generate tags for editors
  1368. # ---------------------------------------------------------------------------
  1369. quiet_cmd_tags = GEN $@
  1370. cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
  1371. tags TAGS cscope gtags: FORCE
  1372. $(call cmd,tags)
  1373. # Scripts to check various things for consistency
  1374. # ---------------------------------------------------------------------------
  1375. PHONY += includecheck versioncheck coccicheck namespacecheck export_report
  1376. includecheck:
  1377. find $(srctree)/* $(RCS_FIND_IGNORE) \
  1378. -name '*.[hcS]' -type f -print | sort \
  1379. | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
  1380. versioncheck:
  1381. find $(srctree)/* $(RCS_FIND_IGNORE) \
  1382. -name '*.[hcS]' -type f -print | sort \
  1383. | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
  1384. coccicheck:
  1385. $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
  1386. namespacecheck:
  1387. $(PERL) $(srctree)/scripts/namespace.pl
  1388. export_report:
  1389. $(PERL) $(srctree)/scripts/export_report.pl
  1390. endif #ifeq ($(config-targets),1)
  1391. endif #ifeq ($(mixed-targets),1)
  1392. PHONY += checkstack kernelrelease kernelversion image_name
  1393. # UML needs a little special treatment here. It wants to use the host
  1394. # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
  1395. # else wants $(ARCH), including people doing cross-builds, which means
  1396. # that $(SUBARCH) doesn't work here.
  1397. ifeq ($(ARCH), um)
  1398. CHECKSTACK_ARCH := $(SUBARCH)
  1399. else
  1400. CHECKSTACK_ARCH := $(ARCH)
  1401. endif
  1402. checkstack:
  1403. $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
  1404. $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
  1405. kernelrelease:
  1406. @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
  1407. kernelversion:
  1408. @echo $(KERNELVERSION)
  1409. image_name:
  1410. @echo $(KBUILD_IMAGE)
  1411. # Clear a bunch of variables before executing the submake
  1412. tools/: FORCE
  1413. $(Q)mkdir -p $(objtree)/tools
  1414. $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
  1415. tools/%: FORCE
  1416. $(Q)mkdir -p $(objtree)/tools
  1417. $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
  1418. # Single targets
  1419. # ---------------------------------------------------------------------------
  1420. # Single targets are compatible with:
  1421. # - build with mixed source and output
  1422. # - build with separate output dir 'make O=...'
  1423. # - external modules
  1424. #
  1425. # target-dir => where to store outputfile
  1426. # build-dir => directory in kernel source tree to use
  1427. ifeq ($(KBUILD_EXTMOD),)
  1428. build-dir = $(patsubst %/,%,$(dir $@))
  1429. target-dir = $(dir $@)
  1430. else
  1431. zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
  1432. build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
  1433. target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
  1434. endif
  1435. %.s: %.c prepare scripts FORCE
  1436. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1437. %.i: %.c prepare scripts FORCE
  1438. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1439. %.o: %.c prepare scripts FORCE
  1440. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1441. %.lst: %.c prepare scripts FORCE
  1442. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1443. %.s: %.S prepare scripts FORCE
  1444. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1445. %.o: %.S prepare scripts FORCE
  1446. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1447. %.symtypes: %.c prepare scripts FORCE
  1448. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1449. %.ll: %.c prepare scripts FORCE
  1450. $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
  1451. # Modules
  1452. /: prepare scripts FORCE
  1453. $(cmd_crmodverdir)
  1454. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1455. $(build)=$(build-dir)
  1456. # Make sure the latest headers are built for Documentation
  1457. Documentation/ samples/: headers_install
  1458. %/: prepare scripts FORCE
  1459. $(cmd_crmodverdir)
  1460. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1461. $(build)=$(build-dir)
  1462. %.ko: prepare scripts FORCE
  1463. $(cmd_crmodverdir)
  1464. $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
  1465. $(build)=$(build-dir) $(@:.ko=.o)
  1466. $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
  1467. # FIXME Should go into a make.lib or something
  1468. # ===========================================================================
  1469. quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
  1470. cmd_rmdirs = rm -rf $(rm-dirs)
  1471. quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
  1472. cmd_rmfiles = rm -f $(rm-files)
  1473. # Run depmod only if we have System.map and depmod is executable
  1474. quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
  1475. cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
  1476. $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
  1477. # Create temporary dir for module support files
  1478. # clean it up only when building all modules
  1479. cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
  1480. $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
  1481. # read all saved command lines
  1482. cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
  1483. ifneq ($(cmd_files),)
  1484. $(cmd_files): ; # Do not try to update included dependency files
  1485. include $(cmd_files)
  1486. endif
  1487. endif # skip-makefile
  1488. PHONY += FORCE
  1489. FORCE:
  1490. # Declare the contents of the .PHONY variable as phony. We keep that
  1491. # information in a variable so we can use it in if_changed and friends.
  1492. .PHONY: $(PHONY)