xref: /openbmc/linux/Makefile (revision ba61bb17)
1# SPDX-License-Identifier: GPL-2.0
2VERSION = 4
3PATCHLEVEL = 18
4SUBLEVEL = 0
5EXTRAVERSION = -rc3
6NAME = Merciless Moray
7
8# *DOCUMENTATION*
9# To see a list of typical targets execute "make help"
10# More info can be located in ./README
11# Comments in this file are targeted only to the developer, do not
12# expect to learn how to build the kernel reading this file.
13
14# That's our default target when none is given on the command line
15PHONY := _all
16_all:
17
18# o Do not use make's built-in rules and variables
19#   (this increases performance and avoids hard-to-debug behaviour);
20# o Look for make include files relative to root of kernel src
21MAKEFLAGS += -rR --include-dir=$(CURDIR)
22
23# Avoid funny character set dependencies
24unexport LC_ALL
25LC_COLLATE=C
26LC_NUMERIC=C
27export LC_COLLATE LC_NUMERIC
28
29# Avoid interference with shell env settings
30unexport GREP_OPTIONS
31
32# We are using a recursive build, so we need to do a little thinking
33# to get the ordering right.
34#
35# Most importantly: sub-Makefiles should only ever modify files in
36# their own directory. If in some directory we have a dependency on
37# a file in another dir (which doesn't happen often, but it's often
38# unavoidable when linking the built-in.a targets which finally
39# turn into vmlinux), we will call a sub make in that other dir, and
40# after that we are sure that everything which is in that other dir
41# is now up to date.
42#
43# The only cases where we need to modify files which have global
44# effects are thus separated out and done before the recursive
45# descending is started. They are now explicitly listed as the
46# prepare rule.
47
48# Beautify output
49# ---------------------------------------------------------------------------
50#
51# Normally, we echo the whole command before executing it. By making
52# that echo $($(quiet)$(cmd)), we now have the possibility to set
53# $(quiet) to choose other forms of output instead, e.g.
54#
55#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
56#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
57#
58# If $(quiet) is empty, the whole command will be printed.
59# If it is set to "quiet_", only the short version will be printed.
60# If it is set to "silent_", nothing will be printed at all, since
61# the variable $(silent_cmd_cc_o_c) doesn't exist.
62#
63# A simple variant is to prefix commands with $(Q) - that's useful
64# for commands that shall be hidden in non-verbose mode.
65#
66#	$(Q)ln $@ :<
67#
68# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
69# If KBUILD_VERBOSE equals 1 then the above command is displayed.
70#
71# To put more focus on warnings, be less verbose as default
72# Use 'make V=1' to see the full commands
73
74ifeq ("$(origin V)", "command line")
75  KBUILD_VERBOSE = $(V)
76endif
77ifndef KBUILD_VERBOSE
78  KBUILD_VERBOSE = 0
79endif
80
81ifeq ($(KBUILD_VERBOSE),1)
82  quiet =
83  Q =
84else
85  quiet=quiet_
86  Q = @
87endif
88
89# If the user is running make -s (silent mode), suppress echoing of
90# commands
91
92ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
93  quiet=silent_
94  tools_silent=s
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is not intended to be used by the regular user (for now),
115# it is set on invocation of make with KBUILD_OUTPUT or O= specified.
116ifeq ($(KBUILD_SRC),)
117
118# OK, Make called in directory where kernel src resides
119# Do we want to locate output files in a separate directory?
120ifeq ("$(origin O)", "command line")
121  KBUILD_OUTPUT := $(O)
122endif
123
124# Cancel implicit rules on top Makefile
125$(CURDIR)/Makefile Makefile: ;
126
127ifneq ($(words $(subst :, ,$(CURDIR))), 1)
128  $(error main directory cannot contain spaces nor colons)
129endif
130
131ifneq ($(KBUILD_OUTPUT),)
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135								&& pwd)
136$(if $(KBUILD_OUTPUT),, \
137     $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142	@:
143
144# Invoke a second make in the output directory, passing relevant variables
145sub-make:
146	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
147	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
148
149# Leave processing to above invocation of make
150skip-makefile := 1
151endif # ifneq ($(KBUILD_OUTPUT),)
152endif # ifeq ($(KBUILD_SRC),)
153
154# We process the rest of the Makefile if this is the final invocation of make
155ifeq ($(skip-makefile),)
156
157# Do not print "Entering directory ...",
158# but we want to display it when entering to the output directory
159# so that IDEs/editors are able to understand relative filenames.
160MAKEFLAGS += --no-print-directory
161
162# Call a source code checker (by default, "sparse") as part of the
163# C compilation.
164#
165# Use 'make C=1' to enable checking of only re-compiled files.
166# Use 'make C=2' to enable checking of *all* source files, regardless
167# of whether they are re-compiled or not.
168#
169# See the file "Documentation/dev-tools/sparse.rst" for more details,
170# including where to get the "sparse" utility.
171
172ifeq ("$(origin C)", "command line")
173  KBUILD_CHECKSRC = $(C)
174endif
175ifndef KBUILD_CHECKSRC
176  KBUILD_CHECKSRC = 0
177endif
178
179# Use make M=dir to specify directory of external module to build
180# Old syntax make ... SUBDIRS=$PWD is still supported
181# Setting the environment variable KBUILD_EXTMOD take precedence
182ifdef SUBDIRS
183  KBUILD_EXTMOD ?= $(SUBDIRS)
184endif
185
186ifeq ("$(origin M)", "command line")
187  KBUILD_EXTMOD := $(M)
188endif
189
190ifeq ($(KBUILD_SRC),)
191        # building in the source tree
192        srctree := .
193else
194        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
195                # building in a subdirectory of the source tree
196                srctree := ..
197        else
198                srctree := $(KBUILD_SRC)
199        endif
200endif
201
202export KBUILD_CHECKSRC KBUILD_EXTMOD KBUILD_SRC
203
204objtree		:= .
205src		:= $(srctree)
206obj		:= $(objtree)
207
208VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
209
210export srctree objtree VPATH
211
212# To make sure we do not include .config for any of the *config targets
213# catch them early, and hand them over to scripts/kconfig/Makefile
214# It is allowed to specify more targets when calling make, including
215# mixing *config targets and build targets.
216# For example 'make oldconfig all'.
217# Detect when mixed targets is specified, and make a second invocation
218# of make so .config is not included in this case either (for *config).
219
220version_h := include/generated/uapi/linux/version.h
221old_version_h := include/linux/version.h
222
223clean-targets := %clean mrproper cleandocs
224no-dot-config-targets := $(clean-targets) \
225			 cscope gtags TAGS tags help% %docs check% coccicheck \
226			 $(version_h) headers_% archheaders archscripts \
227			 kernelversion %src-pkg
228
229config-targets := 0
230mixed-targets  := 0
231dot-config     := 1
232
233ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
234	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
235		dot-config := 0
236	endif
237endif
238
239ifeq ($(KBUILD_EXTMOD),)
240        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
241                config-targets := 1
242                ifneq ($(words $(MAKECMDGOALS)),1)
243                        mixed-targets := 1
244                endif
245        endif
246endif
247
248# For "make -j clean all", "make -j mrproper defconfig all", etc.
249ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
250        ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
251                mixed-targets := 1
252        endif
253endif
254
255# install and modules_install need also be processed one by one
256ifneq ($(filter install,$(MAKECMDGOALS)),)
257        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
258	        mixed-targets := 1
259        endif
260endif
261
262ifeq ($(mixed-targets),1)
263# ===========================================================================
264# We're called with mixed targets (*config and build targets).
265# Handle them one by one.
266
267PHONY += $(MAKECMDGOALS) __build_one_by_one
268
269$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
270	@:
271
272__build_one_by_one:
273	$(Q)set -e; \
274	for i in $(MAKECMDGOALS); do \
275		$(MAKE) -f $(srctree)/Makefile $$i; \
276	done
277
278else
279
280# We need some generic definitions (do not try to remake the file).
281scripts/Kbuild.include: ;
282include scripts/Kbuild.include
283
284# Read KERNELRELEASE from include/config/kernel.release (if it exists)
285KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
286KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
287export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
288
289# SUBARCH tells the usermode build what the underlying arch is.  That is set
290# first, and if a usermode build is happening, the "ARCH=um" on the command
291# line overrides the setting of ARCH below.  If a native build is happening,
292# then ARCH is assigned, getting whatever value it gets normally, and
293# SUBARCH is subsequently ignored.
294
295SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
296				  -e s/sun4u/sparc64/ \
297				  -e s/arm.*/arm/ -e s/sa110/arm/ \
298				  -e s/s390x/s390/ -e s/parisc64/parisc/ \
299				  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
300				  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \
301				  -e s/riscv.*/riscv/)
302
303# Cross compiling and selecting different set of gcc/bin-utils
304# ---------------------------------------------------------------------------
305#
306# When performing cross compilation for other architectures ARCH shall be set
307# to the target architecture. (See arch/* for the possibilities).
308# ARCH can be set during invocation of make:
309# make ARCH=ia64
310# Another way is to have ARCH set in the environment.
311# The default ARCH is the host where make is executed.
312
313# CROSS_COMPILE specify the prefix used for all executables used
314# during compilation. Only gcc and related bin-utils executables
315# are prefixed with $(CROSS_COMPILE).
316# CROSS_COMPILE can be set on the command line
317# make CROSS_COMPILE=ia64-linux-
318# Alternatively CROSS_COMPILE can be set in the environment.
319# Default value for CROSS_COMPILE is not to prefix executables
320# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
321ARCH		?= $(SUBARCH)
322
323# Architecture as present in compile.h
324UTS_MACHINE 	:= $(ARCH)
325SRCARCH 	:= $(ARCH)
326
327# Additional ARCH settings for x86
328ifeq ($(ARCH),i386)
329        SRCARCH := x86
330endif
331ifeq ($(ARCH),x86_64)
332        SRCARCH := x86
333endif
334
335# Additional ARCH settings for sparc
336ifeq ($(ARCH),sparc32)
337       SRCARCH := sparc
338endif
339ifeq ($(ARCH),sparc64)
340       SRCARCH := sparc
341endif
342
343# Additional ARCH settings for sh
344ifeq ($(ARCH),sh64)
345       SRCARCH := sh
346endif
347
348KCONFIG_CONFIG	?= .config
349export KCONFIG_CONFIG
350
351# SHELL used by kbuild
352CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
353	  else if [ -x /bin/bash ]; then echo /bin/bash; \
354	  else echo sh; fi ; fi)
355
356HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS)
357HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS)
358HOST_LFS_LIBS := $(shell getconf LFS_LIBS)
359
360HOSTCC       = gcc
361HOSTCXX      = g++
362HOSTCFLAGS   := -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 \
363		-fomit-frame-pointer -std=gnu89 $(HOST_LFS_CFLAGS)
364HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS)
365HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS)
366HOST_LOADLIBES := $(HOST_LFS_LIBS)
367
368# Make variables (CC, etc...)
369AS		= $(CROSS_COMPILE)as
370LD		= $(CROSS_COMPILE)ld
371CC		= $(CROSS_COMPILE)gcc
372CPP		= $(CC) -E
373AR		= $(CROSS_COMPILE)ar
374NM		= $(CROSS_COMPILE)nm
375STRIP		= $(CROSS_COMPILE)strip
376OBJCOPY		= $(CROSS_COMPILE)objcopy
377OBJDUMP		= $(CROSS_COMPILE)objdump
378LEX		= flex
379YACC		= bison
380AWK		= awk
381GENKSYMS	= scripts/genksyms/genksyms
382INSTALLKERNEL  := installkernel
383DEPMOD		= /sbin/depmod
384PERL		= perl
385PYTHON		= python
386PYTHON2		= python2
387PYTHON3		= python3
388CHECK		= sparse
389
390CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
391		  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
392NOSTDINC_FLAGS  =
393CFLAGS_MODULE   =
394AFLAGS_MODULE   =
395LDFLAGS_MODULE  =
396CFLAGS_KERNEL	=
397AFLAGS_KERNEL	=
398LDFLAGS_vmlinux =
399
400# Use USERINCLUDE when you must reference the UAPI directories only.
401USERINCLUDE    := \
402		-I$(srctree)/arch/$(SRCARCH)/include/uapi \
403		-I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
404		-I$(srctree)/include/uapi \
405		-I$(objtree)/include/generated/uapi \
406                -include $(srctree)/include/linux/kconfig.h
407
408# Use LINUXINCLUDE when you must reference the include/ directory.
409# Needed to be compatible with the O= option
410LINUXINCLUDE    := \
411		-I$(srctree)/arch/$(SRCARCH)/include \
412		-I$(objtree)/arch/$(SRCARCH)/include/generated \
413		$(if $(KBUILD_SRC), -I$(srctree)/include) \
414		-I$(objtree)/include \
415		$(USERINCLUDE)
416
417KBUILD_AFLAGS   := -D__ASSEMBLY__
418KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
419		   -fno-strict-aliasing -fno-common -fshort-wchar \
420		   -Werror-implicit-function-declaration \
421		   -Wno-format-security \
422		   -std=gnu89
423KBUILD_CPPFLAGS := -D__KERNEL__
424KBUILD_AFLAGS_KERNEL :=
425KBUILD_CFLAGS_KERNEL :=
426KBUILD_AFLAGS_MODULE  := -DMODULE
427KBUILD_CFLAGS_MODULE  := -DMODULE
428KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
429LDFLAGS :=
430GCC_PLUGINS_CFLAGS :=
431
432export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
433export CPP AR NM STRIP OBJCOPY OBJDUMP HOSTLDFLAGS HOST_LOADLIBES
434export MAKE LEX YACC AWK GENKSYMS INSTALLKERNEL PERL PYTHON PYTHON2 PYTHON3 UTS_MACHINE
435export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
436
437export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
438export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
439export CFLAGS_KASAN CFLAGS_KASAN_NOSANITIZE CFLAGS_UBSAN
440export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
441export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
442export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
443export KBUILD_ARFLAGS
444
445# When compiling out-of-tree modules, put MODVERDIR in the module
446# tree rather than in the kernel tree. The kernel tree might
447# even be read-only.
448export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
449
450# Files to ignore in find ... statements
451
452export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
453			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
454			  -prune -o
455export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
456			 --exclude CVS --exclude .pc --exclude .hg --exclude .git
457
458# ===========================================================================
459# Rules shared between *config targets and build targets
460
461# Basic helpers built in scripts/basic/
462PHONY += scripts_basic
463scripts_basic:
464	$(Q)$(MAKE) $(build)=scripts/basic
465	$(Q)rm -f .tmp_quiet_recordmcount
466
467# To avoid any implicit rule to kick in, define an empty command.
468scripts/basic/%: scripts_basic ;
469
470PHONY += outputmakefile
471# outputmakefile generates a Makefile in the output directory, if using a
472# separate output directory. This allows convenient use of make in the
473# output directory.
474outputmakefile:
475ifneq ($(KBUILD_SRC),)
476	$(Q)ln -fsn $(srctree) source
477	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
478	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
479endif
480
481ifeq ($(cc-name),clang)
482ifneq ($(CROSS_COMPILE),)
483CLANG_TARGET	:= --target=$(notdir $(CROSS_COMPILE:%-=%))
484GCC_TOOLCHAIN	:= $(realpath $(dir $(shell which $(LD)))/..)
485endif
486ifneq ($(GCC_TOOLCHAIN),)
487CLANG_GCC_TC	:= --gcc-toolchain=$(GCC_TOOLCHAIN)
488endif
489KBUILD_CFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
490KBUILD_AFLAGS += $(CLANG_TARGET) $(CLANG_GCC_TC)
491KBUILD_CFLAGS += $(call cc-option, -no-integrated-as)
492KBUILD_AFLAGS += $(call cc-option, -no-integrated-as)
493endif
494
495RETPOLINE_CFLAGS_GCC := -mindirect-branch=thunk-extern -mindirect-branch-register
496RETPOLINE_CFLAGS_CLANG := -mretpoline-external-thunk
497RETPOLINE_CFLAGS := $(call cc-option,$(RETPOLINE_CFLAGS_GCC),$(call cc-option,$(RETPOLINE_CFLAGS_CLANG)))
498export RETPOLINE_CFLAGS
499
500KBUILD_CFLAGS	+= $(call cc-option,-fno-PIE)
501KBUILD_AFLAGS	+= $(call cc-option,-fno-PIE)
502
503# check for 'asm goto'
504ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC) $(KBUILD_CFLAGS)), y)
505  CC_HAVE_ASM_GOTO := 1
506  KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
507  KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
508endif
509
510ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/cc-can-link.sh $(CC)), y)
511  CC_CAN_LINK := y
512  export CC_CAN_LINK
513endif
514
515# The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
516# Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
517# CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
518# and from include/config/auto.conf.cmd to detect the compiler upgrade.
519CC_VERSION_TEXT = $(shell $(CC) --version | head -n 1)
520
521ifeq ($(config-targets),1)
522# ===========================================================================
523# *config targets only - make sure prerequisites are updated, and descend
524# in scripts/kconfig to make the *config target
525
526# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
527# KBUILD_DEFCONFIG may point out an alternative default configuration
528# used for 'make defconfig'
529include arch/$(SRCARCH)/Makefile
530export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
531
532config: scripts_basic outputmakefile FORCE
533	$(Q)$(MAKE) $(build)=scripts/kconfig $@
534
535%config: scripts_basic outputmakefile FORCE
536	$(Q)$(MAKE) $(build)=scripts/kconfig $@
537
538else
539# ===========================================================================
540# Build targets only - this includes vmlinux, arch specific targets, clean
541# targets and others. In general all targets except *config targets.
542
543# If building an external module we do not care about the all: rule
544# but instead _all depend on modules
545PHONY += all
546ifeq ($(KBUILD_EXTMOD),)
547_all: all
548else
549_all: modules
550endif
551
552# Decide whether to build built-in, modular, or both.
553# Normally, just do built-in.
554
555KBUILD_MODULES :=
556KBUILD_BUILTIN := 1
557
558# If we have only "make modules", don't compile built-in objects.
559# When we're building modules with modversions, we need to consider
560# the built-in objects during the descend as well, in order to
561# make sure the checksums are up to date before we record them.
562
563ifeq ($(MAKECMDGOALS),modules)
564  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
565endif
566
567# If we have "make <whatever> modules", compile modules
568# in addition to whatever we do anyway.
569# Just "make" or "make all" shall build modules as well
570
571ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
572  KBUILD_MODULES := 1
573endif
574
575ifeq ($(MAKECMDGOALS),)
576  KBUILD_MODULES := 1
577endif
578
579export KBUILD_MODULES KBUILD_BUILTIN
580
581ifeq ($(KBUILD_EXTMOD),)
582# Objects we will link into vmlinux / subdirs we need to visit
583init-y		:= init/
584drivers-y	:= drivers/ sound/ firmware/
585net-y		:= net/
586libs-y		:= lib/
587core-y		:= usr/
588virt-y		:= virt/
589endif # KBUILD_EXTMOD
590
591ifeq ($(dot-config),1)
592-include include/config/auto.conf
593endif
594
595# The all: target is the default when no target is given on the
596# command line.
597# This allow a user to issue only 'make' to build a kernel including modules
598# Defaults to vmlinux, but the arch makefile usually adds further targets
599all: vmlinux
600
601CFLAGS_GCOV	:= -fprofile-arcs -ftest-coverage \
602	$(call cc-option,-fno-tree-loop-im) \
603	$(call cc-disable-warning,maybe-uninitialized,)
604export CFLAGS_GCOV
605
606# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
607# values of the respective KBUILD_* variables
608ARCH_CPPFLAGS :=
609ARCH_AFLAGS :=
610ARCH_CFLAGS :=
611include arch/$(SRCARCH)/Makefile
612
613ifeq ($(dot-config),1)
614ifeq ($(KBUILD_EXTMOD),)
615# Read in dependencies to all Kconfig* files, make sure to run syncconfig if
616# changes are detected. This should be included after arch/$(SRCARCH)/Makefile
617# because some architectures define CROSS_COMPILE there.
618-include include/config/auto.conf.cmd
619
620# To avoid any implicit rule to kick in, define an empty command
621$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
622
623# The actual configuration files used during the build are stored in
624# include/generated/ and include/config/. Update them if .config is newer than
625# include/config/auto.conf (which mirrors .config).
626include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
627	$(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
628else
629# external modules needs include/generated/autoconf.h and include/config/auto.conf
630# but do not care if they are up-to-date. Use auto.conf to trigger the test
631PHONY += include/config/auto.conf
632
633include/config/auto.conf:
634	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
635	echo >&2;							\
636	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
637	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
638	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
639	echo >&2 ;							\
640	/bin/false)
641
642endif # KBUILD_EXTMOD
643
644else
645# Dummy target needed, because used as prerequisite
646include/config/auto.conf: ;
647endif # $(dot-config)
648
649KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
650KBUILD_CFLAGS	+= $(call cc-disable-warning,frame-address,)
651KBUILD_CFLAGS	+= $(call cc-disable-warning, format-truncation)
652KBUILD_CFLAGS	+= $(call cc-disable-warning, format-overflow)
653KBUILD_CFLAGS	+= $(call cc-disable-warning, int-in-bool-context)
654
655ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
656KBUILD_CFLAGS	+= $(call cc-option,-Oz,-Os)
657KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
658else
659ifdef CONFIG_PROFILE_ALL_BRANCHES
660KBUILD_CFLAGS	+= -O2 $(call cc-disable-warning,maybe-uninitialized,)
661else
662KBUILD_CFLAGS   += -O2
663endif
664endif
665
666KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
667			$(call cc-disable-warning,maybe-uninitialized,))
668
669# Tell gcc to never replace conditional load with a non-conditional one
670KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
671
672include scripts/Makefile.kcov
673include scripts/Makefile.gcc-plugins
674
675ifdef CONFIG_READABLE_ASM
676# Disable optimizations that make assembler listings hard to read.
677# reorder blocks reorders the control in the function
678# ipa clone creates specialized cloned functions
679# partial inlining inlines only parts of functions
680KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
681                 $(call cc-option,-fno-ipa-cp-clone,) \
682                 $(call cc-option,-fno-partial-inlining)
683endif
684
685ifneq ($(CONFIG_FRAME_WARN),0)
686KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
687endif
688
689stackp-flags-$(CONFIG_CC_HAS_STACKPROTECTOR_NONE) := -fno-stack-protector
690stackp-flags-$(CONFIG_STACKPROTECTOR)             := -fstack-protector
691stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG)      := -fstack-protector-strong
692
693KBUILD_CFLAGS += $(stackp-flags-y)
694
695ifeq ($(cc-name),clang)
696KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
697KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
698KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
699KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
700# Quiet clang warning: comparison of unsigned expression < 0 is always false
701KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
702# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
703# source of a reference will be _MergedGlobals and not on of the whitelisted names.
704# See modpost pattern 2
705KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
706KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
707else
708
709# These warnings generated too much noise in a regular build.
710# Use make W=1 to enable them (see scripts/Makefile.extrawarn)
711KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
712endif
713
714KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
715ifdef CONFIG_FRAME_POINTER
716KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
717else
718# Some targets (ARM with Thumb2, for example), can't be built with frame
719# pointers.  For those, we don't have FUNCTION_TRACER automatically
720# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
721# incompatible with -fomit-frame-pointer with current GCC, so we don't use
722# -fomit-frame-pointer with FUNCTION_TRACER.
723ifndef CONFIG_FUNCTION_TRACER
724KBUILD_CFLAGS	+= -fomit-frame-pointer
725endif
726endif
727
728KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
729
730ifdef CONFIG_DEBUG_INFO
731ifdef CONFIG_DEBUG_INFO_SPLIT
732KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
733else
734KBUILD_CFLAGS	+= -g
735endif
736KBUILD_AFLAGS	+= -Wa,-gdwarf-2
737endif
738ifdef CONFIG_DEBUG_INFO_DWARF4
739KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
740endif
741
742ifdef CONFIG_DEBUG_INFO_REDUCED
743KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
744		   $(call cc-option,-fno-var-tracking)
745endif
746
747ifdef CONFIG_FUNCTION_TRACER
748ifndef CC_FLAGS_FTRACE
749CC_FLAGS_FTRACE := -pg
750endif
751export CC_FLAGS_FTRACE
752ifdef CONFIG_HAVE_FENTRY
753CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
754endif
755KBUILD_CFLAGS	+= $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
756KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
757ifdef CONFIG_DYNAMIC_FTRACE
758	ifdef CONFIG_HAVE_C_RECORDMCOUNT
759		BUILD_C_RECORDMCOUNT := y
760		export BUILD_C_RECORDMCOUNT
761	endif
762endif
763endif
764
765# We trigger additional mismatches with less inlining
766ifdef CONFIG_DEBUG_SECTION_MISMATCH
767KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
768endif
769
770ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
771KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-ffunction-sections,)
772KBUILD_CFLAGS_KERNEL	+= $(call cc-option,-fdata-sections,)
773endif
774
775# arch Makefile may override CC so keep this after arch Makefile is included
776NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
777
778# warn about C99 declaration after statement
779KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
780
781# disable pointer signed / unsigned warnings in gcc 4.0
782KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
783
784# disable invalid "can't wrap" optimizations for signed / pointers
785KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
786
787# clang sets -fmerge-all-constants by default as optimization, but this
788# is non-conforming behavior for C and in fact breaks the kernel, so we
789# need to disable it here generally.
790KBUILD_CFLAGS	+= $(call cc-option,-fno-merge-all-constants)
791
792# for gcc -fno-merge-all-constants disables everything, but it is fine
793# to have actual conforming behavior enabled.
794KBUILD_CFLAGS	+= $(call cc-option,-fmerge-constants)
795
796# Make sure -fstack-check isn't enabled (like gentoo apparently did)
797KBUILD_CFLAGS  += $(call cc-option,-fno-stack-check,)
798
799# conserve stack if available
800KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
801
802# disallow errors like 'EXPORT_GPL(foo);' with missing header
803KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
804
805# require functions to have arguments in prototypes, not empty 'int foo()'
806KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
807
808# Prohibit date/time macros, which would make the build non-deterministic
809KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
810
811# enforce correct pointer usage
812KBUILD_CFLAGS   += $(call cc-option,-Werror=incompatible-pointer-types)
813
814# Require designated initializers for all marked structures
815KBUILD_CFLAGS   += $(call cc-option,-Werror=designated-init)
816
817# change __FILE__ to the relative path from the srctree
818KBUILD_CFLAGS	+= $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
819
820# use the deterministic mode of AR if available
821KBUILD_ARFLAGS := $(call ar-option,D)
822
823include scripts/Makefile.kasan
824include scripts/Makefile.extrawarn
825include scripts/Makefile.ubsan
826
827# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
828# last assignments
829KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
830KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
831KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
832
833# Use --build-id when available.
834LDFLAGS_BUILD_ID := $(call ld-option, --build-id)
835KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
836LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
837
838ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
839LDFLAGS_vmlinux	+= $(call ld-option, --gc-sections,)
840endif
841
842ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
843LDFLAGS_vmlinux	+= $(call ld-option, -X,)
844endif
845
846# insure the checker run with the right endianness
847CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
848
849# the checker needs the correct machine size
850CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
851
852# Default kernel image to build when no specific target is given.
853# KBUILD_IMAGE may be overruled on the command line or
854# set in the environment
855# Also any assignments in arch/$(ARCH)/Makefile take precedence over
856# this default value
857export KBUILD_IMAGE ?= vmlinux
858
859#
860# INSTALL_PATH specifies where to place the updated kernel and system map
861# images. Default is /boot, but you can set it to other values
862export	INSTALL_PATH ?= /boot
863
864#
865# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
866# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
867# an argument if needed. Otherwise it defaults to the kernel install path
868#
869export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
870
871#
872# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
873# relocations required by build roots.  This is not defined in the
874# makefile but the argument can be passed to make if needed.
875#
876
877MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
878export MODLIB
879
880#
881# INSTALL_MOD_STRIP, if defined, will cause modules to be
882# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
883# the default option --strip-debug will be used.  Otherwise,
884# INSTALL_MOD_STRIP value will be used as the options to the strip command.
885
886ifdef INSTALL_MOD_STRIP
887ifeq ($(INSTALL_MOD_STRIP),1)
888mod_strip_cmd = $(STRIP) --strip-debug
889else
890mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
891endif # INSTALL_MOD_STRIP=1
892else
893mod_strip_cmd = true
894endif # INSTALL_MOD_STRIP
895export mod_strip_cmd
896
897# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
898# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
899# or CONFIG_MODULE_COMPRESS_XZ.
900
901mod_compress_cmd = true
902ifdef CONFIG_MODULE_COMPRESS
903  ifdef CONFIG_MODULE_COMPRESS_GZIP
904    mod_compress_cmd = gzip -n -f
905  endif # CONFIG_MODULE_COMPRESS_GZIP
906  ifdef CONFIG_MODULE_COMPRESS_XZ
907    mod_compress_cmd = xz -f
908  endif # CONFIG_MODULE_COMPRESS_XZ
909endif # CONFIG_MODULE_COMPRESS
910export mod_compress_cmd
911
912# Select initial ramdisk compression format, default is gzip(1).
913# This shall be used by the dracut(8) tool while creating an initramfs image.
914#
915INITRD_COMPRESS-y                  := gzip
916INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
917INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
918INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
919INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
920INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
921# do not export INITRD_COMPRESS, since we didn't actually
922# choose a sane default compression above.
923# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
924
925ifdef CONFIG_MODULE_SIG_ALL
926$(eval $(call config_filename,MODULE_SIG_KEY))
927
928mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
929else
930mod_sign_cmd = true
931endif
932export mod_sign_cmd
933
934ifdef CONFIG_STACK_VALIDATION
935  has_libelf := $(call try-run,\
936		echo "int main() {}" | $(HOSTCC) -xc -o /dev/null -lelf -,1,0)
937  ifeq ($(has_libelf),1)
938    objtool_target := tools/objtool FORCE
939  else
940    ifdef CONFIG_UNWINDER_ORC
941      $(error "Cannot generate ORC metadata for CONFIG_UNWINDER_ORC=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
942    else
943      $(warning "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, libelf-devel or elfutils-libelf-devel")
944    endif
945    SKIP_STACK_VALIDATION := 1
946    export SKIP_STACK_VALIDATION
947  endif
948endif
949
950
951ifeq ($(KBUILD_EXTMOD),)
952core-y		+= kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
953
954vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
955		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
956		     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
957
958vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
959		     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
960
961init-y		:= $(patsubst %/, %/built-in.a, $(init-y))
962core-y		:= $(patsubst %/, %/built-in.a, $(core-y))
963drivers-y	:= $(patsubst %/, %/built-in.a, $(drivers-y))
964net-y		:= $(patsubst %/, %/built-in.a, $(net-y))
965libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
966libs-y2		:= $(patsubst %/, %/built-in.a, $(filter-out %.a, $(libs-y)))
967virt-y		:= $(patsubst %/, %/built-in.a, $(virt-y))
968
969# Externally visible symbols (used by link-vmlinux.sh)
970export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
971export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y2) $(drivers-y) $(net-y) $(virt-y)
972export KBUILD_VMLINUX_LIBS := $(libs-y1)
973export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
974export LDFLAGS_vmlinux
975# used by scripts/package/Makefile
976export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
977
978vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN) $(KBUILD_VMLINUX_LIBS)
979
980# Recurse until adjust_autoksyms.sh is satisfied
981PHONY += autoksyms_recursive
982autoksyms_recursive: $(vmlinux-deps)
983ifdef CONFIG_TRIM_UNUSED_KSYMS
984	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/adjust_autoksyms.sh \
985	  "$(MAKE) -f $(srctree)/Makefile vmlinux"
986endif
987
988# For the kernel to actually contain only the needed exported symbols,
989# we have to build modules as well to determine what those symbols are.
990# (this can be evaluated only once include/config/auto.conf has been included)
991ifdef CONFIG_TRIM_UNUSED_KSYMS
992  KBUILD_MODULES := 1
993endif
994
995autoksyms_h := $(if $(CONFIG_TRIM_UNUSED_KSYMS), include/generated/autoksyms.h)
996
997$(autoksyms_h):
998	$(Q)mkdir -p $(dir $@)
999	$(Q)touch $@
1000
1001ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink)
1002
1003# Final link of vmlinux with optional arch pass after final link
1004cmd_link-vmlinux =                                                 \
1005	$(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) ;    \
1006	$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true)
1007
1008vmlinux: scripts/link-vmlinux.sh autoksyms_recursive $(vmlinux-deps) FORCE
1009ifdef CONFIG_HEADERS_CHECK
1010	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
1011endif
1012ifdef CONFIG_GDB_SCRIPTS
1013	$(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1014endif
1015	+$(call if_changed,link-vmlinux)
1016
1017# Build samples along the rest of the kernel
1018ifdef CONFIG_SAMPLES
1019vmlinux-dirs += samples
1020endif
1021
1022# The actual objects are generated when descending,
1023# make sure no implicit rule kicks in
1024$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
1025
1026# Handle descending into subdirectories listed in $(vmlinux-dirs)
1027# Preset locale variables to speed up the build process. Limit locale
1028# tweaks to this spot to avoid wrong language settings when running
1029# make menuconfig etc.
1030# Error messages still appears in the original language
1031
1032PHONY += $(vmlinux-dirs)
1033$(vmlinux-dirs): prepare scripts
1034	$(Q)$(MAKE) $(build)=$@ need-builtin=1
1035
1036define filechk_kernel.release
1037	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1038endef
1039
1040# Store (new) KERNELRELEASE string in include/config/kernel.release
1041include/config/kernel.release: include/config/auto.conf FORCE
1042	$(call filechk,kernel.release)
1043
1044# Additional helpers built in scripts/
1045# Carefully list dependencies so we do not try to build scripts twice
1046# in parallel
1047PHONY += scripts
1048scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
1049	 asm-generic gcc-plugins $(autoksyms_h)
1050	$(Q)$(MAKE) $(build)=$(@)
1051
1052# Things we need to do before we recursively start building the kernel
1053# or the modules are listed in "prepare".
1054# A multi level approach is used. prepareN is processed before prepareN-1.
1055# archprepare is used in arch Makefiles and when processed asm symlink,
1056# version.h and scripts_basic is processed / created.
1057
1058# Listed in dependency order
1059PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
1060
1061# prepare3 is used to check if we are building in a separate output directory,
1062# and if so do:
1063# 1) Check that make has not been executed in the kernel src $(srctree)
1064prepare3: include/config/kernel.release
1065ifneq ($(KBUILD_SRC),)
1066	@$(kecho) '  Using $(srctree) as source for kernel'
1067	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1068		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1069		echo >&2 "  in the '$(srctree)' directory.";\
1070		/bin/false; \
1071	fi;
1072endif
1073
1074# prepare2 creates a makefile if using a separate output directory.
1075# From this point forward, .config has been reprocessed, so any rules
1076# that need to depend on updated CONFIG_* values can be checked here.
1077prepare2: prepare3 outputmakefile asm-generic
1078
1079prepare1: prepare2 $(version_h) $(autoksyms_h) include/generated/utsrelease.h \
1080                   include/config/auto.conf
1081	$(cmd_crmodverdir)
1082
1083archprepare: archheaders archscripts prepare1 scripts_basic
1084
1085prepare0: archprepare gcc-plugins
1086	$(Q)$(MAKE) $(build)=.
1087
1088# All the preparing..
1089prepare: prepare0 prepare-objtool
1090
1091# Support for using generic headers in asm-generic
1092PHONY += asm-generic uapi-asm-generic
1093asm-generic: uapi-asm-generic
1094	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1095	            src=asm obj=arch/$(SRCARCH)/include/generated/asm
1096uapi-asm-generic:
1097	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
1098	            src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
1099
1100PHONY += prepare-objtool
1101prepare-objtool: $(objtool_target)
1102
1103# Generate some files
1104# ---------------------------------------------------------------------------
1105
1106# KERNELRELEASE can change from a few different places, meaning version.h
1107# needs to be updated, so this check is forced on all builds
1108
1109uts_len := 64
1110define filechk_utsrelease.h
1111	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1112	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1113	  exit 1;                                                         \
1114	fi;                                                               \
1115	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1116endef
1117
1118define filechk_version.h
1119	(echo \#define LINUX_VERSION_CODE $(shell                         \
1120	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1121	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1122endef
1123
1124$(version_h): $(srctree)/Makefile FORCE
1125	$(call filechk,version.h)
1126	$(Q)rm -f $(old_version_h)
1127
1128include/generated/utsrelease.h: include/config/kernel.release FORCE
1129	$(call filechk,utsrelease.h)
1130
1131PHONY += headerdep
1132headerdep:
1133	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1134	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1135
1136# ---------------------------------------------------------------------------
1137# Kernel headers
1138
1139#Default location for installed headers
1140export INSTALL_HDR_PATH = $(objtree)/usr
1141
1142# If we do an all arch process set dst to include/arch-$(SRCARCH)
1143hdr-dst = $(if $(KBUILD_HEADERS), dst=include/arch-$(SRCARCH), dst=include)
1144
1145PHONY += archheaders
1146archheaders:
1147
1148PHONY += archscripts
1149archscripts:
1150
1151PHONY += __headers
1152__headers: $(version_h) scripts_basic uapi-asm-generic archheaders archscripts
1153	$(Q)$(MAKE) $(build)=scripts build_unifdef
1154
1155PHONY += headers_install_all
1156headers_install_all:
1157	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1158
1159PHONY += headers_install
1160headers_install: __headers
1161	$(if $(wildcard $(srctree)/arch/$(SRCARCH)/include/uapi/asm/Kbuild),, \
1162	  $(error Headers not exportable for the $(SRCARCH) architecture))
1163	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include
1164	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst)
1165
1166PHONY += headers_check_all
1167headers_check_all: headers_install_all
1168	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1169
1170PHONY += headers_check
1171headers_check: headers_install
1172	$(Q)$(MAKE) $(hdr-inst)=include/uapi dst=include HDRCHECK=1
1173	$(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi $(hdr-dst) HDRCHECK=1
1174
1175# ---------------------------------------------------------------------------
1176# Kernel selftest
1177
1178PHONY += kselftest
1179kselftest:
1180	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1181
1182PHONY += kselftest-clean
1183kselftest-clean:
1184	$(Q)$(MAKE) -C $(srctree)/tools/testing/selftests clean
1185
1186PHONY += kselftest-merge
1187kselftest-merge:
1188	$(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1189	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/kconfig/merge_config.sh \
1190		-m $(objtree)/.config \
1191		$(srctree)/tools/testing/selftests/*/config
1192	+$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1193
1194# ---------------------------------------------------------------------------
1195# Modules
1196
1197ifdef CONFIG_MODULES
1198
1199# By default, build modules as well
1200
1201all: modules
1202
1203# Build modules
1204#
1205# A module can be listed more than once in obj-m resulting in
1206# duplicate lines in modules.order files.  Those are removed
1207# using awk while concatenating to the final file.
1208
1209PHONY += modules
1210modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1211	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1212	@$(kecho) '  Building modules, stage 2.';
1213	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1214
1215modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1216	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1217
1218%/modules.builtin: include/config/auto.conf
1219	$(Q)$(MAKE) $(modbuiltin)=$*
1220
1221
1222# Target to prepare building external modules
1223PHONY += modules_prepare
1224modules_prepare: prepare scripts
1225
1226# Target to install modules
1227PHONY += modules_install
1228modules_install: _modinst_ _modinst_post
1229
1230PHONY += _modinst_
1231_modinst_:
1232	@rm -rf $(MODLIB)/kernel
1233	@rm -f $(MODLIB)/source
1234	@mkdir -p $(MODLIB)/kernel
1235	@ln -s $(abspath $(srctree)) $(MODLIB)/source
1236	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1237		rm -f $(MODLIB)/build ; \
1238		ln -s $(CURDIR) $(MODLIB)/build ; \
1239	fi
1240	@cp -f $(objtree)/modules.order $(MODLIB)/
1241	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1242	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1243
1244# This depmod is only for convenience to give the initial
1245# boot a modules.dep even before / is mounted read-write.  However the
1246# boot script depmod is the master version.
1247PHONY += _modinst_post
1248_modinst_post: _modinst_
1249	$(call cmd,depmod)
1250
1251ifeq ($(CONFIG_MODULE_SIG), y)
1252PHONY += modules_sign
1253modules_sign:
1254	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1255endif
1256
1257else # CONFIG_MODULES
1258
1259# Modules not configured
1260# ---------------------------------------------------------------------------
1261
1262PHONY += modules modules_install
1263modules modules_install:
1264	@echo >&2
1265	@echo >&2 "The present kernel configuration has modules disabled."
1266	@echo >&2 "Type 'make config' and enable loadable module support."
1267	@echo >&2 "Then build a kernel with module support enabled."
1268	@echo >&2
1269	@exit 1
1270
1271endif # CONFIG_MODULES
1272
1273###
1274# Cleaning is done on three levels.
1275# make clean     Delete most generated files
1276#                Leave enough to build external modules
1277# make mrproper  Delete the current configuration, and all generated files
1278# make distclean Remove editor backup files, patch leftover files and the like
1279
1280# Directories & files removed with 'make clean'
1281CLEAN_DIRS  += $(MODVERDIR) include/ksym
1282
1283# Directories & files removed with 'make mrproper'
1284MRPROPER_DIRS  += include/config usr/include include/generated          \
1285		  arch/*/include/generated .tmp_objdiff
1286MRPROPER_FILES += .config .config.old .version \
1287		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1288		  signing_key.pem signing_key.priv signing_key.x509	\
1289		  x509.genkey extra_certificates signing_key.x509.keyid	\
1290		  signing_key.x509.signer vmlinux-gdb.py
1291
1292# clean - Delete most, but leave enough to build external modules
1293#
1294clean: rm-dirs  := $(CLEAN_DIRS)
1295clean: rm-files := $(CLEAN_FILES)
1296clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1297
1298PHONY += $(clean-dirs) clean archclean vmlinuxclean
1299$(clean-dirs):
1300	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1301
1302vmlinuxclean:
1303	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1304	$(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1305
1306clean: archclean vmlinuxclean
1307
1308# mrproper - Delete all generated files, including .config
1309#
1310mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1311mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1312mrproper-dirs      := $(addprefix _mrproper_,scripts)
1313
1314PHONY += $(mrproper-dirs) mrproper archmrproper
1315$(mrproper-dirs):
1316	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1317
1318mrproper: clean archmrproper $(mrproper-dirs)
1319	$(call cmd,rmdirs)
1320	$(call cmd,rmfiles)
1321
1322# distclean
1323#
1324PHONY += distclean
1325
1326distclean: mrproper
1327	@find $(srctree) $(RCS_FIND_IGNORE) \
1328		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1329		-o -name '*.bak' -o -name '#*#' -o -name '*%' \
1330		-o -name 'core' \) \
1331		-type f -print | xargs rm -f
1332
1333
1334# Packaging of the kernel to various formats
1335# ---------------------------------------------------------------------------
1336# rpm target kept for backward compatibility
1337package-dir	:= scripts/package
1338
1339%src-pkg: FORCE
1340	$(Q)$(MAKE) $(build)=$(package-dir) $@
1341%pkg: include/config/kernel.release FORCE
1342	$(Q)$(MAKE) $(build)=$(package-dir) $@
1343rpm: rpm-pkg
1344	@echo "  WARNING: \"rpm\" target will be removed after Linux 4.18"
1345	@echo "           Please use \"rpm-pkg\" instead."
1346
1347
1348# Brief documentation of the typical targets used
1349# ---------------------------------------------------------------------------
1350
1351boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1352boards := $(sort $(notdir $(boards)))
1353board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1354board-dirs := $(sort $(notdir $(board-dirs:/=)))
1355
1356PHONY += help
1357help:
1358	@echo  'Cleaning targets:'
1359	@echo  '  clean		  - Remove most generated files but keep the config and'
1360	@echo  '                    enough build support to build external modules'
1361	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1362	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1363	@echo  ''
1364	@echo  'Configuration targets:'
1365	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1366	@echo  ''
1367	@echo  'Other generic targets:'
1368	@echo  '  all		  - Build all targets marked with [*]'
1369	@echo  '* vmlinux	  - Build the bare kernel'
1370	@echo  '* modules	  - Build all modules'
1371	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1372	@echo  '  dir/            - Build all files in dir and below'
1373	@echo  '  dir/file.[ois]  - Build specified target only'
1374	@echo  '  dir/file.ll     - Build the LLVM assembly file'
1375	@echo  '                    (requires compiler support for LLVM assembly generation)'
1376	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1377	@echo  '                    (requires a recent binutils and recent build (System.map))'
1378	@echo  '  dir/file.ko     - Build module including final link'
1379	@echo  '  modules_prepare - Set up for building external modules'
1380	@echo  '  tags/TAGS	  - Generate tags file for editors'
1381	@echo  '  cscope	  - Generate cscope index'
1382	@echo  '  gtags           - Generate GNU GLOBAL index'
1383	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1384	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1385	@echo  '  image_name	  - Output the image name (use with make -s)'
1386	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1387	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1388	 echo  ''
1389	@echo  'Static analysers:'
1390	@echo  '  checkstack      - Generate a list of stack hogs'
1391	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1392	@echo  '  versioncheck    - Sanity check on version.h usage'
1393	@echo  '  includecheck    - Check for duplicate included header files'
1394	@echo  '  export_report   - List the usages of all exported symbols'
1395	@echo  '  headers_check   - Sanity check on exported headers'
1396	@echo  '  headerdep       - Detect inclusion cycles in headers'
1397	@echo  '  coccicheck      - Check with Coccinelle'
1398	@echo  ''
1399	@echo  'Kernel selftest:'
1400	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1401	@echo  '                    Build, install, and boot kernel before'
1402	@echo  '                    running kselftest on it'
1403	@echo  '  kselftest-clean - Remove all generated kselftest files'
1404	@echo  '  kselftest-merge - Merge all the config dependencies of kselftest to existing'
1405	@echo  '                    .config.'
1406	@echo  ''
1407	@echo 'Userspace tools targets:'
1408	@echo '  use "make tools/help"'
1409	@echo '  or  "cd tools; make help"'
1410	@echo  ''
1411	@echo  'Kernel packaging:'
1412	@$(MAKE) $(build)=$(package-dir) help
1413	@echo  ''
1414	@echo  'Documentation targets:'
1415	@$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1416	@echo  ''
1417	@echo  'Architecture specific targets ($(SRCARCH)):'
1418	@$(if $(archhelp),$(archhelp),\
1419		echo '  No architecture specific help defined for $(SRCARCH)')
1420	@echo  ''
1421	@$(if $(boards), \
1422		$(foreach b, $(boards), \
1423		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1424		echo '')
1425	@$(if $(board-dirs), \
1426		$(foreach b, $(board-dirs), \
1427		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1428		printf "  %-16s - Show all of the above\\n" help-boards; \
1429		echo '')
1430
1431	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1432	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1433	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1434	@echo  '  make C=1   [targets] Check re-compiled c source with $$CHECK (sparse by default)'
1435	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1436	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1437	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1438	@echo  '		1: warnings which may be relevant and do not occur too often'
1439	@echo  '		2: warnings which occur quite often but may still be relevant'
1440	@echo  '		3: more obscure warnings, can most likely be ignored'
1441	@echo  '		Multiple levels can be combined with W=12 or W=123'
1442	@echo  ''
1443	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1444	@echo  'For further info see the ./README file'
1445
1446
1447help-board-dirs := $(addprefix help-,$(board-dirs))
1448
1449help-boards: $(help-board-dirs)
1450
1451boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1452
1453$(help-board-dirs): help-%:
1454	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1455	@$(if $(boards-per-dir), \
1456		$(foreach b, $(boards-per-dir), \
1457		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1458		echo '')
1459
1460
1461# Documentation targets
1462# ---------------------------------------------------------------------------
1463DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1464	       linkcheckdocs dochelp refcheckdocs
1465PHONY += $(DOC_TARGETS)
1466$(DOC_TARGETS): scripts_basic FORCE
1467	$(Q)$(MAKE) $(build)=Documentation $@
1468
1469else # KBUILD_EXTMOD
1470
1471###
1472# External module support.
1473# When building external modules the kernel used as basis is considered
1474# read-only, and no consistency checks are made and the make
1475# system is not used on the basis kernel. If updates are required
1476# in the basis kernel ordinary make commands (without M=...) must
1477# be used.
1478#
1479# The following are the only valid targets when building external
1480# modules.
1481# make M=dir clean     Delete all automatically generated files
1482# make M=dir modules   Make all modules in specified dir
1483# make M=dir	       Same as 'make M=dir modules'
1484# make M=dir modules_install
1485#                      Install the modules built in the module directory
1486#                      Assumes install directory is already created
1487
1488# We are always building modules
1489KBUILD_MODULES := 1
1490PHONY += crmodverdir
1491crmodverdir:
1492	$(cmd_crmodverdir)
1493
1494PHONY += $(objtree)/Module.symvers
1495$(objtree)/Module.symvers:
1496	@test -e $(objtree)/Module.symvers || ( \
1497	echo; \
1498	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1499	echo "           is missing; modules will have no dependencies and modversions."; \
1500	echo )
1501
1502module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1503PHONY += $(module-dirs) modules
1504$(module-dirs): crmodverdir $(objtree)/Module.symvers
1505	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1506
1507modules: $(module-dirs)
1508	@$(kecho) '  Building modules, stage 2.';
1509	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1510
1511PHONY += modules_install
1512modules_install: _emodinst_ _emodinst_post
1513
1514install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1515PHONY += _emodinst_
1516_emodinst_:
1517	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1518	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1519
1520PHONY += _emodinst_post
1521_emodinst_post: _emodinst_
1522	$(call cmd,depmod)
1523
1524clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1525
1526PHONY += $(clean-dirs) clean
1527$(clean-dirs):
1528	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1529
1530clean:	rm-dirs := $(MODVERDIR)
1531clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1532
1533PHONY += help
1534help:
1535	@echo  '  Building external modules.'
1536	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1537	@echo  ''
1538	@echo  '  modules         - default target, build the module(s)'
1539	@echo  '  modules_install - install the module'
1540	@echo  '  clean           - remove generated files in module directory only'
1541	@echo  ''
1542
1543# Dummies...
1544PHONY += prepare scripts
1545prepare: ;
1546scripts: ;
1547endif # KBUILD_EXTMOD
1548
1549clean: $(clean-dirs)
1550	$(call cmd,rmdirs)
1551	$(call cmd,rmfiles)
1552	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1553		\( -name '*.[aios]' -o -name '*.ko' -o -name '.*.cmd' \
1554		-o -name '*.ko.*' -o -name '*.dtb' -o -name '*.dtb.S' \
1555		-o -name '*.dwo' -o -name '*.lst' \
1556		-o -name '*.su'  \
1557		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1558		-o -name '*.lex.c' -o -name '*.tab.[ch]' \
1559		-o -name '*.asn1.[ch]' \
1560		-o -name '*.symtypes' -o -name 'modules.order' \
1561		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1562		-o -name '*.c.[012]*.*' \
1563		-o -name '*.ll' \
1564		-o -name '*.gcno' \) -type f -print | xargs rm -f
1565
1566# Generate tags for editors
1567# ---------------------------------------------------------------------------
1568quiet_cmd_tags = GEN     $@
1569      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1570
1571tags TAGS cscope gtags: FORCE
1572	$(call cmd,tags)
1573
1574# Scripts to check various things for consistency
1575# ---------------------------------------------------------------------------
1576
1577PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1578
1579includecheck:
1580	find $(srctree)/* $(RCS_FIND_IGNORE) \
1581		-name '*.[hcS]' -type f -print | sort \
1582		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1583
1584versioncheck:
1585	find $(srctree)/* $(RCS_FIND_IGNORE) \
1586		-name '*.[hcS]' -type f -print | sort \
1587		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1588
1589coccicheck:
1590	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1591
1592namespacecheck:
1593	$(PERL) $(srctree)/scripts/namespace.pl
1594
1595export_report:
1596	$(PERL) $(srctree)/scripts/export_report.pl
1597
1598endif #ifeq ($(config-targets),1)
1599endif #ifeq ($(mixed-targets),1)
1600
1601PHONY += checkstack kernelrelease kernelversion image_name
1602
1603# UML needs a little special treatment here.  It wants to use the host
1604# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1605# else wants $(ARCH), including people doing cross-builds, which means
1606# that $(SUBARCH) doesn't work here.
1607ifeq ($(ARCH), um)
1608CHECKSTACK_ARCH := $(SUBARCH)
1609else
1610CHECKSTACK_ARCH := $(ARCH)
1611endif
1612checkstack:
1613	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1614	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1615
1616kernelrelease:
1617	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1618
1619kernelversion:
1620	@echo $(KERNELVERSION)
1621
1622image_name:
1623	@echo $(KBUILD_IMAGE)
1624
1625# Clear a bunch of variables before executing the submake
1626tools/: FORCE
1627	$(Q)mkdir -p $(objtree)/tools
1628	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/
1629
1630tools/%: FORCE
1631	$(Q)mkdir -p $(objtree)/tools
1632	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(src)/tools/ $*
1633
1634# Single targets
1635# ---------------------------------------------------------------------------
1636# Single targets are compatible with:
1637# - build with mixed source and output
1638# - build with separate output dir 'make O=...'
1639# - external modules
1640#
1641#  target-dir => where to store outputfile
1642#  build-dir  => directory in kernel source tree to use
1643
1644ifeq ($(KBUILD_EXTMOD),)
1645        build-dir  = $(patsubst %/,%,$(dir $@))
1646        target-dir = $(dir $@)
1647else
1648        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1649        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1650        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1651endif
1652
1653%.s: %.c prepare scripts FORCE
1654	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1655%.i: %.c prepare scripts FORCE
1656	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1657%.o: %.c prepare scripts FORCE
1658	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1659%.lst: %.c prepare scripts FORCE
1660	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1661%.s: %.S prepare scripts FORCE
1662	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1663%.o: %.S prepare scripts FORCE
1664	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1665%.symtypes: %.c prepare scripts FORCE
1666	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1667%.ll: %.c prepare scripts FORCE
1668	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1669
1670# Modules
1671/: prepare scripts FORCE
1672	$(cmd_crmodverdir)
1673	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1674	$(build)=$(build-dir)
1675# Make sure the latest headers are built for Documentation
1676Documentation/ samples/: headers_install
1677%/: prepare scripts FORCE
1678	$(cmd_crmodverdir)
1679	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1680	$(build)=$(build-dir)
1681%.ko: prepare scripts FORCE
1682	$(cmd_crmodverdir)
1683	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1684	$(build)=$(build-dir) $(@:.ko=.o)
1685	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1686
1687# FIXME Should go into a make.lib or something
1688# ===========================================================================
1689
1690quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1691      cmd_rmdirs = rm -rf $(rm-dirs)
1692
1693quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1694      cmd_rmfiles = rm -f $(rm-files)
1695
1696# Run depmod only if we have System.map and depmod is executable
1697quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1698      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1699                   $(KERNELRELEASE)
1700
1701# Create temporary dir for module support files
1702# clean it up only when building all modules
1703cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1704                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1705
1706# read all saved command lines
1707
1708cmd_files := $(wildcard .*.cmd $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
1709
1710ifneq ($(cmd_files),)
1711  $(cmd_files): ;	# Do not try to update included dependency files
1712  include $(cmd_files)
1713endif
1714
1715endif	# skip-makefile
1716
1717PHONY += FORCE
1718FORCE:
1719
1720# Declare the contents of the .PHONY variable as phony.  We keep that
1721# information in a variable so we can use it in if_changed and friends.
1722.PHONY: $(PHONY)
1723