Root/Makefile

1VERSION = 3
2PATCHLEVEL = 15
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Shuffling Zombie Juror
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
28# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
44# To put more focus on warnings, be less verbose as default
45# Use 'make V=1' to see the full commands
46
47ifeq ("$(origin V)", "command line")
48  KBUILD_VERBOSE = $(V)
49endif
50ifndef KBUILD_VERBOSE
51  KBUILD_VERBOSE = 0
52endif
53
54# Call a source code checker (by default, "sparse") as part of the
55# C compilation.
56#
57# Use 'make C=1' to enable checking of only re-compiled files.
58# Use 'make C=2' to enable checking of *all* source files, regardless
59# of whether they are re-compiled or not.
60#
61# See the file "Documentation/sparse.txt" for more details, including
62# where to get the "sparse" utility.
63
64ifeq ("$(origin C)", "command line")
65  KBUILD_CHECKSRC = $(C)
66endif
67ifndef KBUILD_CHECKSRC
68  KBUILD_CHECKSRC = 0
69endif
70
71# Use make M=dir to specify directory of external module to build
72# Old syntax make ... SUBDIRS=$PWD is still supported
73# Setting the environment variable KBUILD_EXTMOD take precedence
74ifdef SUBDIRS
75  KBUILD_EXTMOD ?= $(SUBDIRS)
76endif
77
78ifeq ("$(origin M)", "command line")
79  KBUILD_EXTMOD := $(M)
80endif
81
82# kbuild supports saving output files in a separate directory.
83# To locate output files in a separate directory two syntaxes are supported.
84# In both cases the working directory must be the root of the kernel src.
85# 1) O=
86# Use "make O=dir/to/store/output/files/"
87#
88# 2) Set KBUILD_OUTPUT
89# Set the environment variable KBUILD_OUTPUT to point to the directory
90# where the output files shall be placed.
91# export KBUILD_OUTPUT=dir/to/store/output/files/
92# make
93#
94# The O= assignment takes precedence over the KBUILD_OUTPUT environment
95# variable.
96
97
98# KBUILD_SRC is set on invocation of make in OBJ directory
99# KBUILD_SRC is not intended to be used by the regular user (for now)
100ifeq ($(KBUILD_SRC),)
101
102# OK, Make called in directory where kernel src resides
103# Do we want to locate output files in a separate directory?
104ifeq ("$(origin O)", "command line")
105  KBUILD_OUTPUT := $(O)
106endif
107
108ifeq ("$(origin W)", "command line")
109  export KBUILD_ENABLE_EXTRA_GCC_CHECKS := $(W)
110endif
111
112# That's our default target when none is given on the command line
113PHONY := _all
114_all:
115
116# Cancel implicit rules on top Makefile
117$(CURDIR)/Makefile Makefile: ;
118
119ifneq ($(KBUILD_OUTPUT),)
120# Invoke a second make in the output directory, passing relevant variables
121# check that the output directory actually exists
122saved-output := $(KBUILD_OUTPUT)
123KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
124                                && /bin/pwd)
125$(if $(KBUILD_OUTPUT),, \
126     $(error failed to create output directory "$(saved-output)"))
127
128PHONY += $(MAKECMDGOALS) sub-make
129
130$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
131    @:
132
133sub-make: FORCE
134    $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
135    KBUILD_SRC=$(CURDIR) \
136    KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
137    $(filter-out _all sub-make,$(MAKECMDGOALS))
138
139# Leave processing to above invocation of make
140skip-makefile := 1
141endif # ifneq ($(KBUILD_OUTPUT),)
142endif # ifeq ($(KBUILD_SRC),)
143
144# We process the rest of the Makefile if this is the final invocation of make
145ifeq ($(skip-makefile),)
146
147# If building an external module we do not care about the all: rule
148# but instead _all depend on modules
149PHONY += all
150ifeq ($(KBUILD_EXTMOD),)
151_all: all
152else
153_all: modules
154endif
155
156srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR))
157objtree := $(CURDIR)
158src := $(srctree)
159obj := $(objtree)
160
161VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
162
163export srctree objtree VPATH
164
165
166# SUBARCH tells the usermode build what the underlying arch is. That is set
167# first, and if a usermode build is happening, the "ARCH=um" on the command
168# line overrides the setting of ARCH below. If a native build is happening,
169# then ARCH is assigned, getting whatever value it gets normally, and
170# SUBARCH is subsequently ignored.
171
172SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
173                  -e s/sun4u/sparc64/ \
174                  -e s/arm.*/arm/ -e s/sa110/arm/ \
175                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
176                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
177                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
178
179# Cross compiling and selecting different set of gcc/bin-utils
180# ---------------------------------------------------------------------------
181#
182# When performing cross compilation for other architectures ARCH shall be set
183# to the target architecture. (See arch/* for the possibilities).
184# ARCH can be set during invocation of make:
185# make ARCH=ia64
186# Another way is to have ARCH set in the environment.
187# The default ARCH is the host where make is executed.
188
189# CROSS_COMPILE specify the prefix used for all executables used
190# during compilation. Only gcc and related bin-utils executables
191# are prefixed with $(CROSS_COMPILE).
192# CROSS_COMPILE can be set on the command line
193# make CROSS_COMPILE=ia64-linux-
194# Alternatively CROSS_COMPILE can be set in the environment.
195# A third alternative is to store a setting in .config so that plain
196# "make" in the configured kernel build directory always uses that.
197# Default value for CROSS_COMPILE is not to prefix executables
198# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
199ARCH ?= $(SUBARCH)
200CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
201
202# Architecture as present in compile.h
203UTS_MACHINE := $(ARCH)
204SRCARCH := $(ARCH)
205
206# Additional ARCH settings for x86
207ifeq ($(ARCH),i386)
208        SRCARCH := x86
209endif
210ifeq ($(ARCH),x86_64)
211        SRCARCH := x86
212endif
213
214# Additional ARCH settings for sparc
215ifeq ($(ARCH),sparc32)
216       SRCARCH := sparc
217endif
218ifeq ($(ARCH),sparc64)
219       SRCARCH := sparc
220endif
221
222# Additional ARCH settings for sh
223ifeq ($(ARCH),sh64)
224       SRCARCH := sh
225endif
226
227# Additional ARCH settings for tile
228ifeq ($(ARCH),tilepro)
229       SRCARCH := tile
230endif
231ifeq ($(ARCH),tilegx)
232       SRCARCH := tile
233endif
234
235# Where to locate arch specific headers
236hdr-arch := $(SRCARCH)
237
238KCONFIG_CONFIG ?= .config
239export KCONFIG_CONFIG
240
241# SHELL used by kbuild
242CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
243      else if [ -x /bin/bash ]; then echo /bin/bash; \
244      else echo sh; fi ; fi)
245
246HOSTCC = gcc
247HOSTCXX = g++
248HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
249HOSTCXXFLAGS = -O2
250
251ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
252HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
253        -Wno-missing-field-initializers -fno-delete-null-pointer-checks
254endif
255
256# Decide whether to build built-in, modular, or both.
257# Normally, just do built-in.
258
259KBUILD_MODULES :=
260KBUILD_BUILTIN := 1
261
262# If we have only "make modules", don't compile built-in objects.
263# When we're building modules with modversions, we need to consider
264# the built-in objects during the descend as well, in order to
265# make sure the checksums are up to date before we record them.
266
267ifeq ($(MAKECMDGOALS),modules)
268  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
269endif
270
271# If we have "make <whatever> modules", compile modules
272# in addition to whatever we do anyway.
273# Just "make" or "make all" shall build modules as well
274
275ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
276  KBUILD_MODULES := 1
277endif
278
279ifeq ($(MAKECMDGOALS),)
280  KBUILD_MODULES := 1
281endif
282
283export KBUILD_MODULES KBUILD_BUILTIN
284export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
285
286# Beautify output
287# ---------------------------------------------------------------------------
288#
289# Normally, we echo the whole command before executing it. By making
290# that echo $($(quiet)$(cmd)), we now have the possibility to set
291# $(quiet) to choose other forms of output instead, e.g.
292#
293# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
294# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
295#
296# If $(quiet) is empty, the whole command will be printed.
297# If it is set to "quiet_", only the short version will be printed.
298# If it is set to "silent_", nothing will be printed at all, since
299# the variable $(silent_cmd_cc_o_c) doesn't exist.
300#
301# A simple variant is to prefix commands with $(Q) - that's useful
302# for commands that shall be hidden in non-verbose mode.
303#
304# $(Q)ln $@ :<
305#
306# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
307# If KBUILD_VERBOSE equals 1 then the above command is displayed.
308
309ifeq ($(KBUILD_VERBOSE),1)
310  quiet =
311  Q =
312else
313  quiet=quiet_
314  Q = @
315endif
316
317# If the user is running make -s (silent mode), suppress echoing of
318# commands
319
320ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
321ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
322  quiet=silent_
323endif
324else # make-3.8x
325ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
326  quiet=silent_
327endif
328endif
329
330export quiet Q KBUILD_VERBOSE
331
332ifneq ($(CC),)
333ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
334COMPILER := clang
335else
336COMPILER := gcc
337endif
338export COMPILER
339endif
340
341# Look for make include files relative to root of kernel src
342MAKEFLAGS += --include-dir=$(srctree)
343
344# We need some generic definitions (do not try to remake the file).
345$(srctree)/scripts/Kbuild.include: ;
346include $(srctree)/scripts/Kbuild.include
347
348# Make variables (CC, etc...)
349
350AS = $(CROSS_COMPILE)as
351LD = $(CROSS_COMPILE)ld
352CC = $(CROSS_COMPILE)gcc
353CPP = $(CC) -E
354AR = $(CROSS_COMPILE)ar
355NM = $(CROSS_COMPILE)nm
356STRIP = $(CROSS_COMPILE)strip
357OBJCOPY = $(CROSS_COMPILE)objcopy
358OBJDUMP = $(CROSS_COMPILE)objdump
359AWK = awk
360GENKSYMS = scripts/genksyms/genksyms
361INSTALLKERNEL := installkernel
362DEPMOD = /sbin/depmod
363PERL = perl
364CHECK = sparse
365
366CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
367          -Wbitwise -Wno-return-void $(CF)
368CFLAGS_MODULE =
369AFLAGS_MODULE =
370LDFLAGS_MODULE =
371CFLAGS_KERNEL =
372AFLAGS_KERNEL =
373CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
374
375
376# Use USERINCLUDE when you must reference the UAPI directories only.
377USERINCLUDE := \
378        -I$(srctree)/arch/$(hdr-arch)/include/uapi \
379        -Iarch/$(hdr-arch)/include/generated/uapi \
380        -I$(srctree)/include/uapi \
381        -Iinclude/generated/uapi \
382                -include $(srctree)/include/linux/kconfig.h
383
384# Use LINUXINCLUDE when you must reference the include/ directory.
385# Needed to be compatible with the O= option
386LINUXINCLUDE := \
387        -I$(srctree)/arch/$(hdr-arch)/include \
388        -Iarch/$(hdr-arch)/include/generated \
389        $(if $(KBUILD_SRC), -I$(srctree)/include) \
390        -Iinclude \
391        $(USERINCLUDE)
392
393KBUILD_CPPFLAGS := -D__KERNEL__
394
395KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
396           -fno-strict-aliasing -fno-common \
397           -Werror-implicit-function-declaration \
398           -Wno-format-security \
399           $(call cc-option,-fno-delete-null-pointer-checks,)
400KBUILD_AFLAGS_KERNEL :=
401KBUILD_CFLAGS_KERNEL :=
402KBUILD_AFLAGS := -D__ASSEMBLY__
403KBUILD_AFLAGS_MODULE := -DMODULE
404KBUILD_CFLAGS_MODULE := -DMODULE
405KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
406
407# Read KERNELRELEASE from include/config/kernel.release (if it exists)
408KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
409KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
410
411export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
412export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
413export CPP AR NM STRIP OBJCOPY OBJDUMP
414export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
415export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
416
417export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
418export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
419export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
420export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
421export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
422export KBUILD_ARFLAGS
423
424# When compiling out-of-tree modules, put MODVERDIR in the module
425# tree rather than in the kernel tree. The kernel tree might
426# even be read-only.
427export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
428
429# Files to ignore in find ... statements
430
431export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
432              -name CVS -o -name .pc -o -name .hg -o -name .git \) \
433              -prune -o
434export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
435             --exclude CVS --exclude .pc --exclude .hg --exclude .git
436
437# ===========================================================================
438# Rules shared between *config targets and build targets
439
440# Basic helpers built in scripts/
441PHONY += scripts_basic
442scripts_basic:
443    $(Q)$(MAKE) $(build)=scripts/basic
444    $(Q)rm -f .tmp_quiet_recordmcount
445
446# To avoid any implicit rule to kick in, define an empty command.
447scripts/basic/%: scripts_basic ;
448
449PHONY += outputmakefile
450# outputmakefile generates a Makefile in the output directory, if using a
451# separate output directory. This allows convenient use of make in the
452# output directory.
453outputmakefile:
454ifneq ($(KBUILD_SRC),)
455    $(Q)ln -fsn $(srctree) source
456    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
457        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
458endif
459
460# Support for using generic headers in asm-generic
461PHONY += asm-generic
462asm-generic:
463    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
464                src=asm obj=arch/$(SRCARCH)/include/generated/asm
465    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
466                src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
467
468# To make sure we do not include .config for any of the *config targets
469# catch them early, and hand them over to scripts/kconfig/Makefile
470# It is allowed to specify more targets when calling make, including
471# mixing *config targets and build targets.
472# For example 'make oldconfig all'.
473# Detect when mixed targets is specified, and make a second invocation
474# of make so .config is not included in this case either (for *config).
475
476version_h := include/generated/uapi/linux/version.h
477
478no-dot-config-targets := clean mrproper distclean \
479             cscope gtags TAGS tags help %docs check% coccicheck \
480             $(version_h) headers_% archheaders archscripts \
481             kernelversion %src-pkg
482
483config-targets := 0
484mixed-targets := 0
485dot-config := 1
486
487ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
488    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
489        dot-config := 0
490    endif
491endif
492
493ifeq ($(KBUILD_EXTMOD),)
494        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
495                config-targets := 1
496                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
497                        mixed-targets := 1
498                endif
499        endif
500endif
501
502ifeq ($(mixed-targets),1)
503# ===========================================================================
504# We're called with mixed targets (*config and build targets).
505# Handle them one by one.
506
507%:: FORCE
508    $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@
509
510else
511ifeq ($(config-targets),1)
512# ===========================================================================
513# *config targets only - make sure prerequisites are updated, and descend
514# in scripts/kconfig to make the *config target
515
516# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
517# KBUILD_DEFCONFIG may point out an alternative default configuration
518# used for 'make defconfig'
519include $(srctree)/arch/$(SRCARCH)/Makefile
520export KBUILD_DEFCONFIG KBUILD_KCONFIG
521
522config: scripts_basic outputmakefile FORCE
523    $(Q)mkdir -p include/linux include/config
524    $(Q)$(MAKE) $(build)=scripts/kconfig $@
525
526%config: scripts_basic outputmakefile FORCE
527    $(Q)mkdir -p include/linux include/config
528    $(Q)$(MAKE) $(build)=scripts/kconfig $@
529
530else
531# ===========================================================================
532# Build targets only - this includes vmlinux, arch specific targets, clean
533# targets and others. In general all targets except *config targets.
534
535ifeq ($(KBUILD_EXTMOD),)
536# Additional helpers built in scripts/
537# Carefully list dependencies so we do not try to build scripts twice
538# in parallel
539PHONY += scripts
540scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
541     asm-generic
542    $(Q)$(MAKE) $(build)=$(@)
543
544# Objects we will link into vmlinux / subdirs we need to visit
545init-y := init/
546drivers-y := drivers/ sound/ firmware/
547net-y := net/
548libs-y := lib/
549core-y := usr/
550endif # KBUILD_EXTMOD
551
552ifeq ($(dot-config),1)
553# Read in config
554-include include/config/auto.conf
555
556ifeq ($(KBUILD_EXTMOD),)
557# Read in dependencies to all Kconfig* files, make sure to run
558# oldconfig if changes are detected.
559-include include/config/auto.conf.cmd
560
561# To avoid any implicit rule to kick in, define an empty command
562$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
563
564# If .config is newer than include/config/auto.conf, someone tinkered
565# with it and forgot to run make oldconfig.
566# if auto.conf.cmd is missing then we are probably in a cleaned tree so
567# we execute the config step to be sure to catch updated Kconfig files
568include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
569    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
570else
571# external modules needs include/generated/autoconf.h and include/config/auto.conf
572# but do not care if they are up-to-date. Use auto.conf to trigger the test
573PHONY += include/config/auto.conf
574
575include/config/auto.conf:
576    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
577    echo >&2; \
578    echo >&2 " ERROR: Kernel configuration is invalid."; \
579    echo >&2 " include/generated/autoconf.h or $@ are missing.";\
580    echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
581    echo >&2 ; \
582    /bin/false)
583
584endif # KBUILD_EXTMOD
585
586else
587# Dummy target needed, because used as prerequisite
588include/config/auto.conf: ;
589endif # $(dot-config)
590
591# The all: target is the default when no target is given on the
592# command line.
593# This allow a user to issue only 'make' to build a kernel including modules
594# Defaults to vmlinux, but the arch makefile usually adds further targets
595all: vmlinux
596
597ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
598KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
599else
600KBUILD_CFLAGS += -O2
601endif
602
603include $(srctree)/arch/$(SRCARCH)/Makefile
604
605ifdef CONFIG_READABLE_ASM
606# Disable optimizations that make assembler listings hard to read.
607# reorder blocks reorders the control in the function
608# ipa clone creates specialized cloned functions
609# partial inlining inlines only parts of functions
610KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
611                 $(call cc-option,-fno-ipa-cp-clone,) \
612                 $(call cc-option,-fno-partial-inlining)
613endif
614
615ifneq ($(CONFIG_FRAME_WARN),0)
616KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
617endif
618
619# Handle stack protector mode.
620ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
621  stackp-flag := -fstack-protector
622  ifeq ($(call cc-option, $(stackp-flag)),)
623    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
624             -fstack-protector not supported by compiler)
625  endif
626else
627ifdef CONFIG_CC_STACKPROTECTOR_STRONG
628  stackp-flag := -fstack-protector-strong
629  ifeq ($(call cc-option, $(stackp-flag)),)
630    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
631          -fstack-protector-strong not supported by compiler)
632  endif
633else
634  # Force off for distro compilers that enable stack protector by default.
635  stackp-flag := $(call cc-option, -fno-stack-protector)
636endif
637endif
638KBUILD_CFLAGS += $(stackp-flag)
639
640ifeq ($(COMPILER),clang)
641KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
642KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
643KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
644KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
645KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
646# Quiet clang warning: comparison of unsigned expression < 0 is always false
647KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
648# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
649# source of a reference will be _MergedGlobals and not on of the whitelisted names.
650# See modpost pattern 2
651KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
652else
653
654# This warning generated too much noise in a regular build.
655# Use make W=1 to enable this warning (see scripts/Makefile.build)
656KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
657endif
658
659ifdef CONFIG_FRAME_POINTER
660KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
661else
662# Some targets (ARM with Thumb2, for example), can't be built with frame
663# pointers. For those, we don't have FUNCTION_TRACER automatically
664# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
665# incompatible with -fomit-frame-pointer with current GCC, so we don't use
666# -fomit-frame-pointer with FUNCTION_TRACER.
667ifndef CONFIG_FUNCTION_TRACER
668KBUILD_CFLAGS += -fomit-frame-pointer
669endif
670endif
671
672ifdef CONFIG_DEBUG_INFO
673KBUILD_CFLAGS += -g
674KBUILD_AFLAGS += -Wa,--gdwarf-2
675endif
676
677ifdef CONFIG_DEBUG_INFO_REDUCED
678KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
679           $(call cc-option,-fno-var-tracking)
680endif
681
682ifdef CONFIG_FUNCTION_TRACER
683ifdef CONFIG_HAVE_FENTRY
684CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
685endif
686KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
687KBUILD_AFLAGS += $(CC_USING_FENTRY)
688ifdef CONFIG_DYNAMIC_FTRACE
689    ifdef CONFIG_HAVE_C_RECORDMCOUNT
690        BUILD_C_RECORDMCOUNT := y
691        export BUILD_C_RECORDMCOUNT
692    endif
693endif
694endif
695
696# We trigger additional mismatches with less inlining
697ifdef CONFIG_DEBUG_SECTION_MISMATCH
698KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
699endif
700
701# arch Makefile may override CC so keep this after arch Makefile is included
702NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
703CHECKFLAGS += $(NOSTDINC_FLAGS)
704
705# warn about C99 declaration after statement
706KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
707
708# disable pointer signed / unsigned warnings in gcc 4.0
709KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
710
711# disable invalid "can't wrap" optimizations for signed / pointers
712KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
713
714# conserve stack if available
715KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
716
717# disallow errors like 'EXPORT_GPL(foo);' with missing header
718KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
719
720# require functions to have arguments in prototypes, not empty 'int foo()'
721KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
722
723# Prohibit date/time macros, which would make the build non-deterministic
724KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
725
726# use the deterministic mode of AR if available
727KBUILD_ARFLAGS := $(call ar-option,D)
728
729# check for 'asm goto'
730ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
731    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
732endif
733
734# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
735KBUILD_CPPFLAGS += $(KCPPFLAGS)
736KBUILD_AFLAGS += $(KAFLAGS)
737KBUILD_CFLAGS += $(KCFLAGS)
738
739# Use --build-id when available.
740LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
741                  $(call cc-ldoption, -Wl$(comma)--build-id,))
742KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
743LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
744
745ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
746LDFLAGS_vmlinux += $(call ld-option, -X,)
747endif
748
749# Default kernel image to build when no specific target is given.
750# KBUILD_IMAGE may be overruled on the command line or
751# set in the environment
752# Also any assignments in arch/$(ARCH)/Makefile take precedence over
753# this default value
754export KBUILD_IMAGE ?= vmlinux
755
756#
757# INSTALL_PATH specifies where to place the updated kernel and system map
758# images. Default is /boot, but you can set it to other values
759export INSTALL_PATH ?= /boot
760
761#
762# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
763# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
764# an argument if needed. Otherwise it defaults to the kernel install path
765#
766export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
767
768#
769# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
770# relocations required by build roots. This is not defined in the
771# makefile but the argument can be passed to make if needed.
772#
773
774MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
775export MODLIB
776
777#
778# INSTALL_MOD_STRIP, if defined, will cause modules to be
779# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
780# the default option --strip-debug will be used. Otherwise,
781# INSTALL_MOD_STRIP value will be used as the options to the strip command.
782
783ifdef INSTALL_MOD_STRIP
784ifeq ($(INSTALL_MOD_STRIP),1)
785mod_strip_cmd = $(STRIP) --strip-debug
786else
787mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
788endif # INSTALL_MOD_STRIP=1
789else
790mod_strip_cmd = true
791endif # INSTALL_MOD_STRIP
792export mod_strip_cmd
793
794# Select initial ramdisk compression format, default is gzip(1).
795# This shall be used by the dracut(8) tool while creating an initramfs image.
796#
797INITRD_COMPRESS-y := gzip
798INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
799INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
800INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
801INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
802INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
803# do not export INITRD_COMPRESS, since we didn't actually
804# choose a sane default compression above.
805# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
806
807ifdef CONFIG_MODULE_SIG_ALL
808MODSECKEY = ./signing_key.priv
809MODPUBKEY = ./signing_key.x509
810export MODPUBKEY
811mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
812else
813mod_sign_cmd = true
814endif
815export mod_sign_cmd
816
817
818ifeq ($(KBUILD_EXTMOD),)
819core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
820
821vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
822             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
823             $(net-y) $(net-m) $(libs-y) $(libs-m)))
824
825vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
826             $(init-n) $(init-) \
827             $(core-n) $(core-) $(drivers-n) $(drivers-) \
828             $(net-n) $(net-) $(libs-n) $(libs-))))
829
830init-y := $(patsubst %/, %/built-in.o, $(init-y))
831core-y := $(patsubst %/, %/built-in.o, $(core-y))
832drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
833net-y := $(patsubst %/, %/built-in.o, $(net-y))
834libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
835libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
836libs-y := $(libs-y1) $(libs-y2)
837
838# Externally visible symbols (used by link-vmlinux.sh)
839export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
840export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
841export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
842export LDFLAGS_vmlinux
843# used by scripts/pacmage/Makefile
844export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
845
846vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
847
848# Final link of vmlinux
849      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
850quiet_cmd_link-vmlinux = LINK $@
851
852# Include targets which we want to
853# execute if the rest of the kernel build went well.
854vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
855ifdef CONFIG_HEADERS_CHECK
856    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
857endif
858ifdef CONFIG_SAMPLES
859    $(Q)$(MAKE) $(build)=samples
860endif
861ifdef CONFIG_BUILD_DOCSRC
862    $(Q)$(MAKE) $(build)=Documentation
863endif
864    +$(call if_changed,link-vmlinux)
865
866# The actual objects are generated when descending,
867# make sure no implicit rule kicks in
868$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
869
870# Handle descending into subdirectories listed in $(vmlinux-dirs)
871# Preset locale variables to speed up the build process. Limit locale
872# tweaks to this spot to avoid wrong language settings when running
873# make menuconfig etc.
874# Error messages still appears in the original language
875
876PHONY += $(vmlinux-dirs)
877$(vmlinux-dirs): prepare scripts
878    $(Q)$(MAKE) $(build)=$@
879
880define filechk_kernel.release
881    echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
882endef
883
884# Store (new) KERNELRELEASE string in include/config/kernel.release
885include/config/kernel.release: include/config/auto.conf FORCE
886    $(call filechk,kernel.release)
887
888
889# Things we need to do before we recursively start building the kernel
890# or the modules are listed in "prepare".
891# A multi level approach is used. prepareN is processed before prepareN-1.
892# archprepare is used in arch Makefiles and when processed asm symlink,
893# version.h and scripts_basic is processed / created.
894
895# Listed in dependency order
896PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
897
898# prepare3 is used to check if we are building in a separate output directory,
899# and if so do:
900# 1) Check that make has not been executed in the kernel src $(srctree)
901prepare3: include/config/kernel.release
902ifneq ($(KBUILD_SRC),)
903    @$(kecho) ' Using $(srctree) as source for kernel'
904    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
905        echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
906        echo >&2 " in the '$(srctree)' directory.";\
907        /bin/false; \
908    fi;
909endif
910
911# prepare2 creates a makefile if using a separate output directory
912prepare2: prepare3 outputmakefile asm-generic
913
914prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
915                   include/config/auto.conf
916    $(cmd_crmodverdir)
917
918archprepare: archheaders archscripts prepare1 scripts_basic
919
920prepare0: archprepare FORCE
921    $(Q)$(MAKE) $(build)=.
922
923# All the preparing..
924prepare: prepare0
925
926# Generate some files
927# ---------------------------------------------------------------------------
928
929# KERNELRELEASE can change from a few different places, meaning version.h
930# needs to be updated, so this check is forced on all builds
931
932uts_len := 64
933define filechk_utsrelease.h
934    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
935      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
936      exit 1; \
937    fi; \
938    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
939endef
940
941define filechk_version.h
942    (echo \#define LINUX_VERSION_CODE $(shell \
943    expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
944    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
945endef
946
947$(version_h): $(srctree)/Makefile FORCE
948    $(call filechk,version.h)
949
950include/generated/utsrelease.h: include/config/kernel.release FORCE
951    $(call filechk,utsrelease.h)
952
953PHONY += headerdep
954headerdep:
955    $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
956    $(srctree)/scripts/headerdep.pl -I$(srctree)/include
957
958# ---------------------------------------------------------------------------
959
960PHONY += depend dep
961depend dep:
962    @echo '*** Warning: make $@ is unnecessary now.'
963
964# ---------------------------------------------------------------------------
965# Firmware install
966INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
967export INSTALL_FW_PATH
968
969PHONY += firmware_install
970firmware_install: FORCE
971    @mkdir -p $(objtree)/firmware
972    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
973
974# ---------------------------------------------------------------------------
975# Kernel headers
976
977#Default location for installed headers
978export INSTALL_HDR_PATH = $(objtree)/usr
979
980hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
981
982# If we do an all arch process set dst to asm-$(hdr-arch)
983hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
984
985PHONY += archheaders
986archheaders:
987
988PHONY += archscripts
989archscripts:
990
991PHONY += __headers
992__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
993    $(Q)$(MAKE) $(build)=scripts build_unifdef
994
995PHONY += headers_install_all
996headers_install_all:
997    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
998
999PHONY += headers_install
1000headers_install: __headers
1001    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1002      $(error Headers not exportable for the $(SRCARCH) architecture))
1003    $(Q)$(MAKE) $(hdr-inst)=include/uapi
1004    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1005
1006PHONY += headers_check_all
1007headers_check_all: headers_install_all
1008    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1009
1010PHONY += headers_check
1011headers_check: headers_install
1012    $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1013    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1014
1015# ---------------------------------------------------------------------------
1016# Modules
1017
1018ifdef CONFIG_MODULES
1019
1020# By default, build modules as well
1021
1022all: modules
1023
1024# Build modules
1025#
1026# A module can be listed more than once in obj-m resulting in
1027# duplicate lines in modules.order files. Those are removed
1028# using awk while concatenating to the final file.
1029
1030PHONY += modules
1031modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1032    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1033    @$(kecho) ' Building modules, stage 2.';
1034    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1035    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1036
1037modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1038    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1039
1040%/modules.builtin: include/config/auto.conf
1041    $(Q)$(MAKE) $(modbuiltin)=$*
1042
1043
1044# Target to prepare building external modules
1045PHONY += modules_prepare
1046modules_prepare: prepare scripts
1047
1048# Target to install modules
1049PHONY += modules_install
1050modules_install: _modinst_ _modinst_post
1051
1052PHONY += _modinst_
1053_modinst_:
1054    @rm -rf $(MODLIB)/kernel
1055    @rm -f $(MODLIB)/source
1056    @mkdir -p $(MODLIB)/kernel
1057    @ln -s $(srctree) $(MODLIB)/source
1058    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1059        rm -f $(MODLIB)/build ; \
1060        ln -s $(objtree) $(MODLIB)/build ; \
1061    fi
1062    @cp -f $(objtree)/modules.order $(MODLIB)/
1063    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1064    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1065
1066# This depmod is only for convenience to give the initial
1067# boot a modules.dep even before / is mounted read-write. However the
1068# boot script depmod is the master version.
1069PHONY += _modinst_post
1070_modinst_post: _modinst_
1071    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1072    $(call cmd,depmod)
1073
1074ifeq ($(CONFIG_MODULE_SIG), y)
1075PHONY += modules_sign
1076modules_sign:
1077    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1078endif
1079
1080else # CONFIG_MODULES
1081
1082# Modules not configured
1083# ---------------------------------------------------------------------------
1084
1085modules modules_install: FORCE
1086    @echo >&2
1087    @echo >&2 "The present kernel configuration has modules disabled."
1088    @echo >&2 "Type 'make config' and enable loadable module support."
1089    @echo >&2 "Then build a kernel with module support enabled."
1090    @echo >&2
1091    @exit 1
1092
1093endif # CONFIG_MODULES
1094
1095###
1096# Cleaning is done on three levels.
1097# make clean Delete most generated files
1098# Leave enough to build external modules
1099# make mrproper Delete the current configuration, and all generated files
1100# make distclean Remove editor backup files, patch leftover files and the like
1101
1102# Directories & files removed with 'make clean'
1103CLEAN_DIRS += $(MODVERDIR)
1104
1105# Directories & files removed with 'make mrproper'
1106MRPROPER_DIRS += include/config usr/include include/generated \
1107                  arch/*/include/generated .tmp_objdiff
1108MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1109          Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1110          signing_key.priv signing_key.x509 x509.genkey \
1111          extra_certificates signing_key.x509.keyid \
1112          signing_key.x509.signer include/linux/version.h
1113
1114# clean - Delete most, but leave enough to build external modules
1115#
1116clean: rm-dirs := $(CLEAN_DIRS)
1117clean: rm-files := $(CLEAN_FILES)
1118clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1119
1120PHONY += $(clean-dirs) clean archclean vmlinuxclean
1121$(clean-dirs):
1122    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1123
1124vmlinuxclean:
1125    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1126
1127clean: archclean vmlinuxclean
1128
1129# mrproper - Delete all generated files, including .config
1130#
1131mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1132mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1133mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1134
1135PHONY += $(mrproper-dirs) mrproper archmrproper
1136$(mrproper-dirs):
1137    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1138
1139mrproper: clean archmrproper $(mrproper-dirs)
1140    $(call cmd,rmdirs)
1141    $(call cmd,rmfiles)
1142
1143# distclean
1144#
1145PHONY += distclean
1146
1147distclean: mrproper
1148    @find $(srctree) $(RCS_FIND_IGNORE) \
1149        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1150        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1151        -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1152        -type f -print | xargs rm -f
1153
1154
1155# Packaging of the kernel to various formats
1156# ---------------------------------------------------------------------------
1157# rpm target kept for backward compatibility
1158package-dir := $(srctree)/scripts/package
1159
1160%src-pkg: FORCE
1161    $(Q)$(MAKE) $(build)=$(package-dir) $@
1162%pkg: include/config/kernel.release FORCE
1163    $(Q)$(MAKE) $(build)=$(package-dir) $@
1164rpm: include/config/kernel.release FORCE
1165    $(Q)$(MAKE) $(build)=$(package-dir) $@
1166
1167
1168# Brief documentation of the typical targets used
1169# ---------------------------------------------------------------------------
1170
1171boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1172boards := $(notdir $(boards))
1173board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1174board-dirs := $(sort $(notdir $(board-dirs:/=)))
1175
1176help:
1177    @echo 'Cleaning targets:'
1178    @echo ' clean - Remove most generated files but keep the config and'
1179    @echo ' enough build support to build external modules'
1180    @echo ' mrproper - Remove all generated files + config + various backup files'
1181    @echo ' distclean - mrproper + remove editor backup and patch files'
1182    @echo ''
1183    @echo 'Configuration targets:'
1184    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1185    @echo ''
1186    @echo 'Other generic targets:'
1187    @echo ' all - Build all targets marked with [*]'
1188    @echo '* vmlinux - Build the bare kernel'
1189    @echo '* modules - Build all modules'
1190    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1191    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1192    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1193    @echo ' dir/ - Build all files in dir and below'
1194    @echo ' dir/file.[oisS] - Build specified target only'
1195    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1196    @echo ' (requires a recent binutils and recent build (System.map))'
1197    @echo ' dir/file.ko - Build module including final link'
1198    @echo ' modules_prepare - Set up for building external modules'
1199    @echo ' tags/TAGS - Generate tags file for editors'
1200    @echo ' cscope - Generate cscope index'
1201    @echo ' gtags - Generate GNU GLOBAL index'
1202    @echo ' kernelrelease - Output the release version string'
1203    @echo ' kernelversion - Output the version stored in Makefile'
1204    @echo ' image_name - Output the image name'
1205    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1206     echo ' (default: $(INSTALL_HDR_PATH))'; \
1207     echo ''
1208    @echo 'Static analysers'
1209    @echo ' checkstack - Generate a list of stack hogs'
1210    @echo ' namespacecheck - Name space analysis on compiled kernel'
1211    @echo ' versioncheck - Sanity check on version.h usage'
1212    @echo ' includecheck - Check for duplicate included header files'
1213    @echo ' export_report - List the usages of all exported symbols'
1214    @echo ' headers_check - Sanity check on exported headers'
1215    @echo ' headerdep - Detect inclusion cycles in headers'
1216    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1217    @echo ''
1218    @echo 'Kernel packaging:'
1219    @$(MAKE) $(build)=$(package-dir) help
1220    @echo ''
1221    @echo 'Documentation targets:'
1222    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1223    @echo ''
1224    @echo 'Architecture specific targets ($(SRCARCH)):'
1225    @$(if $(archhelp),$(archhelp),\
1226        echo ' No architecture specific help defined for $(SRCARCH)')
1227    @echo ''
1228    @$(if $(boards), \
1229        $(foreach b, $(boards), \
1230        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1231        echo '')
1232    @$(if $(board-dirs), \
1233        $(foreach b, $(board-dirs), \
1234        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1235        printf " %-16s - Show all of the above\\n" help-boards; \
1236        echo '')
1237
1238    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1239    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1240    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1241    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1242    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1243    @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1244    @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1245    @echo ' 1: warnings which may be relevant and do not occur too often'
1246    @echo ' 2: warnings which occur quite often but may still be relevant'
1247    @echo ' 3: more obscure warnings, can most likely be ignored'
1248    @echo ' Multiple levels can be combined with W=12 or W=123'
1249    @echo ''
1250    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1251    @echo 'For further info see the ./README file'
1252
1253
1254help-board-dirs := $(addprefix help-,$(board-dirs))
1255
1256help-boards: $(help-board-dirs)
1257
1258boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1259
1260$(help-board-dirs): help-%:
1261    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1262    @$(if $(boards-per-dir), \
1263        $(foreach b, $(boards-per-dir), \
1264        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1265        echo '')
1266
1267
1268# Documentation targets
1269# ---------------------------------------------------------------------------
1270%docs: scripts_basic FORCE
1271    $(Q)$(MAKE) $(build)=scripts build_docproc
1272    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1273
1274else # KBUILD_EXTMOD
1275
1276###
1277# External module support.
1278# When building external modules the kernel used as basis is considered
1279# read-only, and no consistency checks are made and the make
1280# system is not used on the basis kernel. If updates are required
1281# in the basis kernel ordinary make commands (without M=...) must
1282# be used.
1283#
1284# The following are the only valid targets when building external
1285# modules.
1286# make M=dir clean Delete all automatically generated files
1287# make M=dir modules Make all modules in specified dir
1288# make M=dir Same as 'make M=dir modules'
1289# make M=dir modules_install
1290# Install the modules built in the module directory
1291# Assumes install directory is already created
1292
1293# We are always building modules
1294KBUILD_MODULES := 1
1295PHONY += crmodverdir
1296crmodverdir:
1297    $(cmd_crmodverdir)
1298
1299PHONY += $(objtree)/Module.symvers
1300$(objtree)/Module.symvers:
1301    @test -e $(objtree)/Module.symvers || ( \
1302    echo; \
1303    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1304    echo " is missing; modules will have no dependencies and modversions."; \
1305    echo )
1306
1307module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1308PHONY += $(module-dirs) modules
1309$(module-dirs): crmodverdir $(objtree)/Module.symvers
1310    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1311
1312modules: $(module-dirs)
1313    @$(kecho) ' Building modules, stage 2.';
1314    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1315
1316PHONY += modules_install
1317modules_install: _emodinst_ _emodinst_post
1318
1319install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1320PHONY += _emodinst_
1321_emodinst_:
1322    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1323    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1324
1325PHONY += _emodinst_post
1326_emodinst_post: _emodinst_
1327    $(call cmd,depmod)
1328
1329clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1330
1331PHONY += $(clean-dirs) clean
1332$(clean-dirs):
1333    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1334
1335clean: rm-dirs := $(MODVERDIR)
1336clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1337
1338help:
1339    @echo ' Building external modules.'
1340    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1341    @echo ''
1342    @echo ' modules - default target, build the module(s)'
1343    @echo ' modules_install - install the module'
1344    @echo ' clean - remove generated files in module directory only'
1345    @echo ''
1346
1347# Dummies...
1348PHONY += prepare scripts
1349prepare: ;
1350scripts: ;
1351endif # KBUILD_EXTMOD
1352
1353clean: $(clean-dirs)
1354    $(call cmd,rmdirs)
1355    $(call cmd,rmfiles)
1356    @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1357        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1358        -o -name '*.ko.*' \
1359        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1360        -o -name '*.symtypes' -o -name 'modules.order' \
1361        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1362        -o -name '*.gcno' \) -type f -print | xargs rm -f
1363
1364# Generate tags for editors
1365# ---------------------------------------------------------------------------
1366quiet_cmd_tags = GEN $@
1367      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1368
1369tags TAGS cscope gtags: FORCE
1370    $(call cmd,tags)
1371
1372# Scripts to check various things for consistency
1373# ---------------------------------------------------------------------------
1374
1375PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1376
1377includecheck:
1378    find $(srctree)/* $(RCS_FIND_IGNORE) \
1379        -name '*.[hcS]' -type f -print | sort \
1380        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1381
1382versioncheck:
1383    find $(srctree)/* $(RCS_FIND_IGNORE) \
1384        -name '*.[hcS]' -type f -print | sort \
1385        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1386
1387coccicheck:
1388    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1389
1390namespacecheck:
1391    $(PERL) $(srctree)/scripts/namespace.pl
1392
1393export_report:
1394    $(PERL) $(srctree)/scripts/export_report.pl
1395
1396endif #ifeq ($(config-targets),1)
1397endif #ifeq ($(mixed-targets),1)
1398
1399PHONY += checkstack kernelrelease kernelversion image_name
1400
1401# UML needs a little special treatment here. It wants to use the host
1402# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1403# else wants $(ARCH), including people doing cross-builds, which means
1404# that $(SUBARCH) doesn't work here.
1405ifeq ($(ARCH), um)
1406CHECKSTACK_ARCH := $(SUBARCH)
1407else
1408CHECKSTACK_ARCH := $(ARCH)
1409endif
1410checkstack:
1411    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1412    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1413
1414kernelrelease:
1415    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1416
1417kernelversion:
1418    @echo $(KERNELVERSION)
1419
1420image_name:
1421    @echo $(KBUILD_IMAGE)
1422
1423# Clear a bunch of variables before executing the submake
1424tools/: FORCE
1425    $(Q)mkdir -p $(objtree)/tools
1426    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1427
1428tools/%: FORCE
1429    $(Q)mkdir -p $(objtree)/tools
1430    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1431
1432# Single targets
1433# ---------------------------------------------------------------------------
1434# Single targets are compatible with:
1435# - build with mixed source and output
1436# - build with separate output dir 'make O=...'
1437# - external modules
1438#
1439# target-dir => where to store outputfile
1440# build-dir => directory in kernel source tree to use
1441
1442ifeq ($(KBUILD_EXTMOD),)
1443        build-dir = $(patsubst %/,%,$(dir $@))
1444        target-dir = $(dir $@)
1445else
1446        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1447        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1448        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1449endif
1450
1451%.s: %.c prepare scripts FORCE
1452    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1453%.i: %.c prepare scripts FORCE
1454    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1455%.o: %.c prepare scripts FORCE
1456    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1457%.lst: %.c prepare scripts FORCE
1458    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1459%.s: %.S prepare scripts FORCE
1460    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1461%.o: %.S prepare scripts FORCE
1462    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1463%.symtypes: %.c prepare scripts FORCE
1464    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1465
1466# Modules
1467/: prepare scripts FORCE
1468    $(cmd_crmodverdir)
1469    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1470    $(build)=$(build-dir)
1471%/: prepare scripts FORCE
1472    $(cmd_crmodverdir)
1473    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1474    $(build)=$(build-dir)
1475%.ko: prepare scripts FORCE
1476    $(cmd_crmodverdir)
1477    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1478    $(build)=$(build-dir) $(@:.ko=.o)
1479    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1480
1481# FIXME Should go into a make.lib or something
1482# ===========================================================================
1483
1484quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1485      cmd_rmdirs = rm -rf $(rm-dirs)
1486
1487quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1488      cmd_rmfiles = rm -f $(rm-files)
1489
1490# Run depmod only if we have System.map and depmod is executable
1491quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1492      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1493                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1494
1495# Create temporary dir for module support files
1496# clean it up only when building all modules
1497cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1498                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1499
1500# read all saved command lines
1501
1502targets := $(wildcard $(sort $(targets)))
1503cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1504
1505ifneq ($(cmd_files),)
1506  $(cmd_files): ; # Do not try to update included dependency files
1507  include $(cmd_files)
1508endif
1509
1510# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1511# Usage:
1512# $(Q)$(MAKE) $(clean)=dir
1513clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1514
1515endif # skip-makefile
1516
1517PHONY += FORCE
1518FORCE:
1519
1520# Declare the contents of the .PHONY variable as phony. We keep that
1521# information in a variable so we can use it in if_changed and friends.
1522.PHONY: $(PHONY)
1523

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