source: src/linux/universal/linux-4.4/Makefile @ 31885

Last change on this file since 31885 was 31885, checked in by brainslayer, 5 weeks ago

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1VERSION = 4
2PATCHLEVEL = 4
3SUBLEVEL = 63
4EXTRAVERSION = -rc1
5NAME = Blurry Fish Butt
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# o Do not use make's built-in rules and variables
14#   (this increases performance and avoids hard-to-debug behaviour);
15# o Look for make include files relative to root of kernel src
16MAKEFLAGS += -rR --include-dir=$(CURDIR)
17
18# Avoid funny character set dependencies
19unexport LC_ALL
20LC_COLLATE=C
21LC_NUMERIC=C
22export LC_COLLATE LC_NUMERIC
23
24# Avoid interference with shell env settings
25unexport GREP_OPTIONS
26
27# We are using a recursive build, so we need to do a little thinking
28# to get the ordering right.
29#
30# Most importantly: sub-Makefiles should only ever modify files in
31# their own directory. If in some directory we have a dependency on
32# a file in another dir (which doesn't happen often, but it's often
33# unavoidable when linking the built-in.o targets which finally
34# turn into vmlinux), we will call a sub make in that other dir, and
35# after that we are sure that everything which is in that other dir
36# is now up to date.
37#
38# The only cases where we need to modify files which have global
39# effects are thus separated out and done before the recursive
40# descending is started. They are now explicitly listed as the
41# prepare rule.
42
43# Beautify output
44# ---------------------------------------------------------------------------
45#
46# Normally, we echo the whole command before executing it. By making
47# that echo $($(quiet)$(cmd)), we now have the possibility to set
48# $(quiet) to choose other forms of output instead, e.g.
49#
50#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
51#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
52#
53# If $(quiet) is empty, the whole command will be printed.
54# If it is set to "quiet_", only the short version will be printed.
55# If it is set to "silent_", nothing will be printed at all, since
56# the variable $(silent_cmd_cc_o_c) doesn't exist.
57#
58# A simple variant is to prefix commands with $(Q) - that's useful
59# for commands that shall be hidden in non-verbose mode.
60#
61#       $(Q)ln $@ :<
62#
63# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
64# If KBUILD_VERBOSE equals 1 then the above command is displayed.
65#
66# To put more focus on warnings, be less verbose as default
67# Use 'make V=1' to see the full commands
68
69ifeq ("$(origin V)", "command line")
70  KBUILD_VERBOSE = $(V)
71endif
72ifndef KBUILD_VERBOSE
73  KBUILD_VERBOSE = 0
74endif
75
76ifeq ($(KBUILD_VERBOSE),1)
77  quiet =
78  Q =
79else
80  quiet=quiet_
81  Q = @
82endif
83
84# If the user is running make -s (silent mode), suppress echoing of
85# commands
86
87ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
88ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
89  quiet=silent_
90endif
91else                                    # make-3.8x
92ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
93  quiet=silent_
94endif
95endif
96
97export quiet Q KBUILD_VERBOSE
98
99# kbuild supports saving output files in a separate directory.
100# To locate output files in a separate directory two syntaxes are supported.
101# In both cases the working directory must be the root of the kernel src.
102# 1) O=
103# Use "make O=dir/to/store/output/files/"
104#
105# 2) Set KBUILD_OUTPUT
106# Set the environment variable KBUILD_OUTPUT to point to the directory
107# where the output files shall be placed.
108# export KBUILD_OUTPUT=dir/to/store/output/files/
109# make
110#
111# The O= assignment takes precedence over the KBUILD_OUTPUT environment
112# variable.
113
114# KBUILD_SRC is set on invocation of make in OBJ directory
115# KBUILD_SRC is not intended to be used by the regular user (for now)
116ifeq ($(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 := $(O)
122endif
123
124# That's our default target when none is given on the command line
125PHONY := _all
126_all:
127
128# Cancel implicit rules on top Makefile
129$(CURDIR)/Makefile Makefile: ;
130
131ifneq ($(words $(subst :, ,$(CURDIR))), 1)
132  $(error main directory cannot contain spaces nor colons)
133endif
134
135ifneq ($(KBUILD_OUTPUT),)
136# Invoke a second make in the output directory, passing relevant variables
137# check that the output directory actually exists
138saved-output := $(KBUILD_OUTPUT)
139KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
140                                                                && /bin/pwd)
141$(if $(KBUILD_OUTPUT),, \
142     $(error failed to create output directory "$(saved-output)"))
143
144PHONY += $(MAKECMDGOALS) sub-make
145
146$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
147        @:
148
149sub-make: FORCE
150        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
151        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
152
153# Leave processing to above invocation of make
154skip-makefile := 1
155endif # ifneq ($(KBUILD_OUTPUT),)
156endif # ifeq ($(KBUILD_SRC),)
157
158# We process the rest of the Makefile if this is the final invocation of make
159ifeq ($(skip-makefile),)
160
161# Do not print "Entering directory ...",
162# but we want to display it when entering to the output directory
163# so that IDEs/editors are able to understand relative filenames.
164MAKEFLAGS += --no-print-directory
165
166# Call a source code checker (by default, "sparse") as part of the
167# C compilation.
168#
169# Use 'make C=1' to enable checking of only re-compiled files.
170# Use 'make C=2' to enable checking of *all* source files, regardless
171# of whether they are re-compiled or not.
172#
173# See the file "Documentation/sparse.txt" for more details, including
174# where to get the "sparse" utility.
175
176ifeq ("$(origin C)", "command line")
177  KBUILD_CHECKSRC = $(C)
178endif
179ifndef KBUILD_CHECKSRC
180  KBUILD_CHECKSRC = 0
181endif
182
183# Use make M=dir to specify directory of external module to build
184# Old syntax make ... SUBDIRS=$PWD is still supported
185# Setting the environment variable KBUILD_EXTMOD take precedence
186ifdef SUBDIRS
187  KBUILD_EXTMOD ?= $(SUBDIRS)
188endif
189
190ifeq ("$(origin M)", "command line")
191  KBUILD_EXTMOD := $(M)
192endif
193
194# If building an external module we do not care about the all: rule
195# but instead _all depend on modules
196PHONY += all
197ifeq ($(KBUILD_EXTMOD),)
198_all: all
199else
200_all: modules
201endif
202
203ifeq ($(KBUILD_SRC),)
204        # building in the source tree
205        srctree := .
206else
207        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
208                # building in a subdirectory of the source tree
209                srctree := ..
210        else
211                srctree := $(KBUILD_SRC)
212        endif
213endif
214objtree         := .
215src             := $(srctree)
216obj             := $(objtree)
217
218VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
219
220export srctree objtree VPATH
221
222# SUBARCH tells the usermode build what the underlying arch is.  That is set
223# first, and if a usermode build is happening, the "ARCH=um" on the command
224# line overrides the setting of ARCH below.  If a native build is happening,
225# then ARCH is assigned, getting whatever value it gets normally, and
226# SUBARCH is subsequently ignored.
227ifeq ($(ARCH),armeb)
228ARCH := arm
229endif
230ifeq ($(ARCH),mips64)
231ARCH := mips
232endif
233ifeq ($(ARCH),mipsel)
234ARCH=mips
235endif
236
237SUBARCH := $(ARCH)
238
239# Cross compiling and selecting different set of gcc/bin-utils
240# ---------------------------------------------------------------------------
241#
242# When performing cross compilation for other architectures ARCH shall be set
243# to the target architecture. (See arch/* for the possibilities).
244# ARCH can be set during invocation of make:
245# make ARCH=ia64
246# Another way is to have ARCH set in the environment.
247# The default ARCH is the host where make is executed.
248
249# CROSS_COMPILE specify the prefix used for all executables used
250# during compilation. Only gcc and related bin-utils executables
251# are prefixed with $(CROSS_COMPILE).
252# CROSS_COMPILE can be set on the command line
253# make CROSS_COMPILE=ia64-linux-
254# Alternatively CROSS_COMPILE can be set in the environment.
255# A third alternative is to store a setting in .config so that plain
256# "make" in the configured kernel build directory always uses that.
257# Default value for CROSS_COMPILE is not to prefix executables
258# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
259ARCH            ?= $(SUBARCH)
260CROSS_COMPILE   ?= ccache $(CONFIG_CROSS_COMPILE:"%"=%)
261
262# Architecture as present in compile.h
263UTS_MACHINE     := $(ARCH)
264SRCARCH         := $(ARCH)
265
266# Additional ARCH settings for x86
267ifeq ($(ARCH),i386)
268        SRCARCH := x86
269endif
270ifeq ($(ARCH),x86_64)
271        SRCARCH := x86
272endif
273
274# Additional ARCH settings for sparc
275ifeq ($(ARCH),sparc32)
276       SRCARCH := sparc
277endif
278ifeq ($(ARCH),sparc64)
279       SRCARCH := sparc
280endif
281
282# Additional ARCH settings for sh
283ifeq ($(ARCH),sh64)
284       SRCARCH := sh
285endif
286
287# Additional ARCH settings for tile
288ifeq ($(ARCH),tilepro)
289       SRCARCH := tile
290endif
291ifeq ($(ARCH),tilegx)
292       SRCARCH := tile
293endif
294
295# Where to locate arch specific headers
296hdr-arch  := $(SRCARCH)
297
298KCONFIG_CONFIG  ?= .config
299export KCONFIG_CONFIG
300
301# SHELL used by kbuild
302CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
303          else if [ -x /bin/bash ]; then echo /bin/bash; \
304          else echo sh; fi ; fi)
305
306HOSTCC       = gcc
307HOSTCXX      = g++
308HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
309HOSTCXXFLAGS = -O2
310
311ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
312HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
313                -Wno-missing-field-initializers -fno-delete-null-pointer-checks
314endif
315
316# Decide whether to build built-in, modular, or both.
317# Normally, just do built-in.
318
319KBUILD_MODULES :=
320KBUILD_BUILTIN := 1
321
322# If we have only "make modules", don't compile built-in objects.
323# When we're building modules with modversions, we need to consider
324# the built-in objects during the descend as well, in order to
325# make sure the checksums are up to date before we record them.
326
327ifeq ($(MAKECMDGOALS),modules)
328  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
329endif
330
331# If we have "make <whatever> modules", compile modules
332# in addition to whatever we do anyway.
333# Just "make" or "make all" shall build modules as well
334
335ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
336  KBUILD_MODULES := 1
337endif
338
339ifeq ($(MAKECMDGOALS),)
340  KBUILD_MODULES := 1
341endif
342
343export KBUILD_MODULES KBUILD_BUILTIN
344export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
345
346# We need some generic definitions (do not try to remake the file).
347scripts/Kbuild.include: ;
348include scripts/Kbuild.include
349
350# Make variables (CC, etc...)
351AS              = $(CROSS_COMPILE)as
352LD              = $(CROSS_COMPILE)ld
353CC              = $(CROSS_COMPILE)gcc
354CPP             = $(CC) -E
355AR              = $(CROSS_COMPILE)ar
356NM              = $(CROSS_COMPILE)nm
357STRIP           = $(CROSS_COMPILE)strip
358OBJCOPY         = $(CROSS_COMPILE)objcopy
359OBJDUMP         = $(CROSS_COMPILE)objdump
360AWK             = awk
361GENKSYMS        = scripts/genksyms/genksyms
362INSTALLKERNEL  := installkernel
363DEPMOD          = /sbin/depmod
364PERL            = perl
365PYTHON          = python
366CHECK           = sparse
367
368CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
369                  -Wbitwise -Wno-return-void $(CF)
370CFLAGS_MODULE   =
371AFLAGS_MODULE   =
372LDFLAGS_MODULE  =
373CFLAGS_KERNEL   =
374AFLAGS_KERNEL   =
375CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
376
377
378# Use USERINCLUDE when you must reference the UAPI directories only.
379USERINCLUDE    := \
380                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
381                -Iarch/$(hdr-arch)/include/generated/uapi \
382                -I$(srctree)/include/uapi \
383                -Iinclude/generated/uapi \
384                -include $(srctree)/include/linux/kconfig.h
385
386# Use LINUXINCLUDE when you must reference the include/ directory.
387# Needed to be compatible with the O= option
388LINUXINCLUDE    := \
389                -I$(srctree)/arch/$(hdr-arch)/include \
390                -Iarch/$(hdr-arch)/include/generated/uapi \
391                -Iarch/$(hdr-arch)/include/generated \
392                $(if $(KBUILD_SRC), -I$(srctree)/include) \
393                -Iinclude \
394                $(USERINCLUDE)
395
396KBUILD_CPPFLAGS := -D__KERNEL__
397
398KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
399                   -fno-strict-aliasing -fno-common \
400                   -Werror-implicit-function-declaration \
401                   -Wno-format-security \
402                   -std=gnu89 $(call cc-option,-fno-PIE)
403
404
405KBUILD_AFLAGS_KERNEL :=
406KBUILD_CFLAGS_KERNEL :=
407KBUILD_AFLAGS   := -D__ASSEMBLY__ $(call cc-option,-fno-PIE)
408KBUILD_AFLAGS_MODULE  := -DMODULE
409KBUILD_CFLAGS_MODULE  := -DMODULE
410KBUILD_LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds $(if $(CONFIG_PROFILING),,-s)
411
412
413# Read KERNELRELEASE from include/config/kernel.release (if it exists)
414KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
415KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
416
417export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
418export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
419export CPP AR NM STRIP OBJCOPY OBJDUMP
420export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
421export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
422
423export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
424export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV CFLAGS_KASAN
425export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
426export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
427export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
428export KBUILD_ARFLAGS
429
430# When compiling out-of-tree modules, put MODVERDIR in the module
431# tree rather than in the kernel tree. The kernel tree might
432# even be read-only.
433export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
434
435# Files to ignore in find ... statements
436
437export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
438                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
439                          -prune -o
440export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
441                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
442
443# ===========================================================================
444# Rules shared between *config targets and build targets
445
446# Basic helpers built in scripts/
447PHONY += scripts_basic
448scripts_basic:
449        $(Q)$(MAKE) $(build)=scripts/basic
450        $(Q)rm -f .tmp_quiet_recordmcount
451
452# To avoid any implicit rule to kick in, define an empty command.
453scripts/basic/%: scripts_basic ;
454
455PHONY += outputmakefile
456# outputmakefile generates a Makefile in the output directory, if using a
457# separate output directory. This allows convenient use of make in the
458# output directory.
459outputmakefile:
460ifneq ($(KBUILD_SRC),)
461        $(Q)ln -fsn $(srctree) source
462        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
463            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
464endif
465
466# Support for using generic headers in asm-generic
467PHONY += asm-generic
468asm-generic:
469        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
470                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
471        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
473
474# To make sure we do not include .config for any of the *config targets
475# catch them early, and hand them over to scripts/kconfig/Makefile
476# It is allowed to specify more targets when calling make, including
477# mixing *config targets and build targets.
478# For example 'make oldconfig all'.
479# Detect when mixed targets is specified, and make a second invocation
480# of make so .config is not included in this case either (for *config).
481
482version_h := include/generated/uapi/linux/version.h
483old_version_h := include/linux/version.h
484
485no-dot-config-targets := clean mrproper distclean \
486                         cscope gtags TAGS tags help% %docs check% coccicheck \
487                         $(version_h) headers_% archheaders archscripts \
488                         kernelversion %src-pkg
489
490config-targets := 0
491mixed-targets  := 0
492dot-config     := 1
493
494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496                dot-config := 0
497        endif
498endif
499
500ifeq ($(KBUILD_EXTMOD),)
501        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502                config-targets := 1
503                ifneq ($(words $(MAKECMDGOALS)),1)
504                        mixed-targets := 1
505                endif
506        endif
507endif
508# install and module_install need also be processed one by one
509ifneq ($(filter install,$(MAKECMDGOALS)),)
510        ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
511                mixed-targets := 1
512        endif
513endif
514
515ifeq ($(mixed-targets),1)
516# ===========================================================================
517# We're called with mixed targets (*config and build targets).
518# Handle them one by one.
519
520PHONY += $(MAKECMDGOALS) __build_one_by_one
521
522$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
523        @:
524
525__build_one_by_one:
526        $(Q)set -e; \
527        for i in $(MAKECMDGOALS); do \
528                $(MAKE) -f $(srctree)/Makefile $$i; \
529        done
530
531else
532ifeq ($(config-targets),1)
533# ===========================================================================
534# *config targets only - make sure prerequisites are updated, and descend
535# in scripts/kconfig to make the *config target
536
537# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
538# KBUILD_DEFCONFIG may point out an alternative default configuration
539# used for 'make defconfig'
540include arch/$(SRCARCH)/Makefile
541export KBUILD_DEFCONFIG KBUILD_KCONFIG
542
543config: scripts_basic outputmakefile FORCE
544        $(Q)$(MAKE) $(build)=scripts/kconfig $@
545
546%config: scripts_basic outputmakefile FORCE
547        $(Q)$(MAKE) $(build)=scripts/kconfig $@
548
549else
550# ===========================================================================
551# Build targets only - this includes vmlinux, arch specific targets, clean
552# targets and others. In general all targets except *config targets.
553
554ifeq ($(KBUILD_EXTMOD),)
555# Additional helpers built in scripts/
556# Carefully list dependencies so we do not try to build scripts twice
557# in parallel
558PHONY += scripts
559scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
560         asm-generic
561        $(Q)$(MAKE) $(build)=$(@)
562
563# Objects we will link into vmlinux / subdirs we need to visit
564init-y          := init/
565drivers-y       := drivers/ sound/ firmware/
566net-y           := net/
567libs-y          := lib/
568core-y          := usr/
569virt-y          := virt/
570endif # KBUILD_EXTMOD
571
572ifeq ($(dot-config),1)
573# Read in config
574-include include/config/auto.conf
575
576ifeq ($(KBUILD_EXTMOD),)
577# Read in dependencies to all Kconfig* files, make sure to run
578# oldconfig if changes are detected.
579-include include/config/auto.conf.cmd
580
581# To avoid any implicit rule to kick in, define an empty command
582$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
583
584# If .config is newer than include/config/auto.conf, someone tinkered
585# with it and forgot to run make oldconfig.
586# if auto.conf.cmd is missing then we are probably in a cleaned tree so
587# we execute the config step to be sure to catch updated Kconfig files
588include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
589        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
590else
591# external modules needs include/generated/autoconf.h and include/config/auto.conf
592# but do not care if they are up-to-date. Use auto.conf to trigger the test
593PHONY += include/config/auto.conf
594
595include/config/auto.conf:
596        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
597        echo >&2;                                                       \
598        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
599        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
600        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
601        echo >&2 ;                                                      \
602        /bin/false)
603
604endif # KBUILD_EXTMOD
605
606else
607# Dummy target needed, because used as prerequisite
608include/config/auto.conf: ;
609endif # $(dot-config)
610
611# The all: target is the default when no target is given on the
612# command line.
613# This allow a user to issue only 'make' to build a kernel including modules
614# Defaults to vmlinux, but the arch makefile usually adds further targets
615all: vmlinux
616
617# The arch Makefile can set ARCH_{CPP,A,C}FLAGS to override the default
618# values of the respective KBUILD_* variables
619ARCH_CPPFLAGS :=
620ARCH_AFLAGS :=
621ARCH_CFLAGS :=
622include arch/$(SRCARCH)/Makefile
623
624KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
625KBUILD_CFLAGS   += $(call cc-disable-warning,maybe-uninitialized,)
626KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
627
628
629ifneq ($(CONFIG_PROXYARP),)
630KBUILD_CFLAGS += -DPROXYARP
631endif
632
633ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
634KBUILD_CFLAGS   += -Os -fno-caller-saves
635else
636ifdef CONFIG_PROFILE_ALL_BRANCHES
637KBUILD_CFLAGS   += -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
638else
639KBUILD_CFLAGS   += -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
640endif
641endif
642
643ifdef CONFIG_BCM47XX
644KBUILD_CFLAGS += -DBCMDRIVER -Dlinux
645KBUILD_AFLAGS += -DBCMDRIVER -Dlinux
646endif
647
648
649# Tell gcc to never replace conditional load with a non-conditional one
650KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
651
652ifdef CONFIG_READABLE_ASM
653# Disable optimizations that make assembler listings hard to read.
654# reorder blocks reorders the control in the function
655# ipa clone creates specialized cloned functions
656# partial inlining inlines only parts of functions
657KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
658                 $(call cc-option,-fno-ipa-cp-clone,) \
659                 $(call cc-option,-fno-partial-inlining)
660endif
661
662ifneq ($(CONFIG_FRAME_WARN),0)
663KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
664endif
665
666# Handle stack protector mode.
667#
668# Since kbuild can potentially perform two passes (first with the old
669# .config values and then with updated .config values), we cannot error out
670# if a desired compiler option is unsupported. If we were to error, kbuild
671# could never get to the second pass and actually notice that we changed
672# the option to something that was supported.
673#
674# Additionally, we don't want to fallback and/or silently change which compiler
675# flags will be used, since that leads to producing kernels with different
676# security feature characteristics depending on the compiler used. ("But I
677# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
678#
679# The middle ground is to warn here so that the failed option is obvious, but
680# to let the build fail with bad compiler flags so that we can't produce a
681# kernel when there is a CONFIG and compiler mismatch.
682#
683ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
684  stackp-flag := -fstack-protector
685  ifeq ($(call cc-option, $(stackp-flag)),)
686    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
687             -fstack-protector not supported by compiler)
688  endif
689else
690ifdef CONFIG_CC_STACKPROTECTOR_STRONG
691  stackp-flag := -fstack-protector-strong
692  ifeq ($(call cc-option, $(stackp-flag)),)
693    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
694              -fstack-protector-strong not supported by compiler)
695  endif
696else
697  # Force off for distro compilers that enable stack protector by default.
698  stackp-flag := $(call cc-option, -fno-stack-protector)
699endif
700endif
701KBUILD_CFLAGS += $(stackp-flag)
702
703ifeq ($(cc-name),clang)
704KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
705KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
706KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
707KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
708KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
709# Quiet clang warning: comparison of unsigned expression < 0 is always false
710KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
711# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
712# source of a reference will be _MergedGlobals and not on of the whitelisted names.
713# See modpost pattern 2
714KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
715KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
716else
717
718# These warnings generated too much noise in a regular build.
719# Use make W=1 to enable them (see scripts/Makefile.build)
720KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
721KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
722endif
723
724ifdef CONFIG_FRAME_POINTER
725KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
726else
727# Some targets (ARM with Thumb2, for example), can't be built with frame
728# pointers.  For those, we don't have FUNCTION_TRACER automatically
729# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
730# incompatible with -fomit-frame-pointer with current GCC, so we don't use
731# -fomit-frame-pointer with FUNCTION_TRACER.
732ifndef CONFIG_FUNCTION_TRACER
733KBUILD_CFLAGS   += -fomit-frame-pointer
734endif
735endif
736
737KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
738
739ifdef CONFIG_DEBUG_INFO
740ifdef CONFIG_DEBUG_INFO_SPLIT
741KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
742else
743KBUILD_CFLAGS   += -g
744endif
745KBUILD_AFLAGS   += -Wa,-gdwarf-2
746endif
747ifdef CONFIG_DEBUG_INFO_DWARF4
748KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
749endif
750
751ifdef CONFIG_DEBUG_INFO_REDUCED
752KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
753                   $(call cc-option,-fno-var-tracking)
754endif
755
756ifdef CONFIG_FUNCTION_TRACER
757ifndef CC_FLAGS_FTRACE
758CC_FLAGS_FTRACE := -pg
759endif
760export CC_FLAGS_FTRACE
761ifdef CONFIG_HAVE_FENTRY
762CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
763endif
764KBUILD_CFLAGS   += $(CC_FLAGS_FTRACE) $(CC_USING_FENTRY)
765KBUILD_AFLAGS   += $(CC_USING_FENTRY)
766ifdef CONFIG_DYNAMIC_FTRACE
767        ifdef CONFIG_HAVE_C_RECORDMCOUNT
768                BUILD_C_RECORDMCOUNT := y
769                export BUILD_C_RECORDMCOUNT
770        endif
771endif
772endif
773
774# We trigger additional mismatches with less inlining
775ifdef CONFIG_DEBUG_SECTION_MISMATCH
776KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
777endif
778
779# arch Makefile may override CC so keep this after arch Makefile is included
780NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
781CHECKFLAGS     += $(NOSTDINC_FLAGS)
782
783# improve gcc optimization
784CFLAGS += $(call cc-option,-funit-at-a-time,)
785
786# warn about C99 declaration after statement
787KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
788
789# disable pointer signed / unsigned warnings in gcc 4.0
790KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
791
792# disable invalid "can't wrap" optimizations for signed / pointers
793KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
794
795# conserve stack if available
796KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
797
798# disallow errors like 'EXPORT_GPL(foo);' with missing header
799KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
800
801# require functions to have arguments in prototypes, not empty 'int foo()'
802KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
803
804# Prohibit date/time macros, which would make the build non-deterministic
805#KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
806
807# use the deterministic mode of AR if available
808KBUILD_ARFLAGS := $(call ar-option,D)
809
810# check for 'asm goto'
811ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
812        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
813        KBUILD_AFLAGS += -DCC_HAVE_ASM_GOTO
814endif
815
816include scripts/Makefile.kasan
817include scripts/Makefile.extrawarn
818
819# Add any arch overrides and user supplied CPPFLAGS, AFLAGS and CFLAGS as the
820# last assignments
821KBUILD_CPPFLAGS += $(ARCH_CPPFLAGS) $(KCPPFLAGS)
822KBUILD_AFLAGS   += $(ARCH_AFLAGS)   $(KAFLAGS)
823KBUILD_CFLAGS   += $(ARCH_CFLAGS)   $(KCFLAGS)
824
825# Use --build-id when available.
826LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
827                              $(call cc-ldoption, -Wl$(comma)--build-id,))
828KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
829LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
830
831ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
832LDFLAGS_vmlinux += $(call ld-option, -X,)
833endif
834
835# Default kernel image to build when no specific target is given.
836# KBUILD_IMAGE may be overruled on the command line or
837# set in the environment
838# Also any assignments in arch/$(ARCH)/Makefile take precedence over
839# this default value
840export KBUILD_IMAGE ?= vmlinux
841
842#
843# INSTALL_PATH specifies where to place the updated kernel and system map
844# images. Default is /boot, but you can set it to other values
845export  INSTALL_PATH ?= /boot
846
847#
848# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
849# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
850# an argument if needed. Otherwise it defaults to the kernel install path
851#
852export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
853
854#
855# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
856# relocations required by build roots.  This is not defined in the
857# makefile but the argument can be passed to make if needed.
858#
859
860MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
861export MODLIB
862
863#
864# INSTALL_MOD_STRIP, if defined, will cause modules to be
865# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
866# the default option --strip-debug will be used.  Otherwise,
867# INSTALL_MOD_STRIP value will be used as the options to the strip command.
868
869ifdef INSTALL_MOD_STRIP
870ifeq ($(INSTALL_MOD_STRIP),1)
871mod_strip_cmd = $(STRIP) --strip-debug
872else
873mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
874endif # INSTALL_MOD_STRIP=1
875else
876mod_strip_cmd = true
877endif # INSTALL_MOD_STRIP
878export mod_strip_cmd
879
880# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
881# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
882# or CONFIG_MODULE_COMPRESS_XZ.
883
884mod_compress_cmd = true
885ifdef CONFIG_MODULE_COMPRESS
886  ifdef CONFIG_MODULE_COMPRESS_GZIP
887    mod_compress_cmd = gzip -n -f
888  endif # CONFIG_MODULE_COMPRESS_GZIP
889  ifdef CONFIG_MODULE_COMPRESS_XZ
890    mod_compress_cmd = xz -f
891  endif # CONFIG_MODULE_COMPRESS_XZ
892endif # CONFIG_MODULE_COMPRESS
893export mod_compress_cmd
894
895# Select initial ramdisk compression format, default is gzip(1).
896# This shall be used by the dracut(8) tool while creating an initramfs image.
897#
898INITRD_COMPRESS-y                  := gzip
899INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
900INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
901INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
902INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
903INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
904# do not export INITRD_COMPRESS, since we didn't actually
905# choose a sane default compression above.
906# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
907
908ifdef CONFIG_MODULE_SIG_ALL
909$(eval $(call config_filename,MODULE_SIG_KEY))
910
911mod_sign_cmd = scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY) certs/signing_key.x509
912else
913mod_sign_cmd = true
914endif
915export mod_sign_cmd
916
917
918ifeq ($(KBUILD_EXTMOD),)
919core-y          += kernel/ certs/ mm/ fs/ ipc/ security/ crypto/ block/
920
921vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
922                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
923                     $(net-y) $(net-m) $(libs-y) $(libs-m) $(virt-y)))
924
925vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
926                     $(init-) $(core-) $(drivers-) $(net-) $(libs-) $(virt-))))
927
928init-y          := $(patsubst %/, %/built-in.o, $(init-y))
929core-y          := $(patsubst %/, %/built-in.o, $(core-y))
930drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
931net-y           := $(patsubst %/, %/built-in.o, $(net-y))
932libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
933libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
934libs-y          := $(libs-y1) $(libs-y2)
935virt-y          := $(patsubst %/, %/built-in.o, $(virt-y))
936
937# Externally visible symbols (used by link-vmlinux.sh)
938export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
939export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y) $(virt-y)
940export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
941export LDFLAGS_vmlinux
942# used by scripts/pacmage/Makefile
943export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools)
944
945vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
946
947# Final link of vmlinux
948      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
949quiet_cmd_link-vmlinux = LINK    $@
950
951# Include targets which we want to
952# execute if the rest of the kernel build went well.
953vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
954ifdef CONFIG_HEADERS_CHECK
955        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
956endif
957ifdef CONFIG_SAMPLES
958        $(Q)$(MAKE) $(build)=samples
959endif
960ifdef CONFIG_BUILD_DOCSRC
961        $(Q)$(MAKE) $(build)=Documentation
962endif
963ifdef CONFIG_GDB_SCRIPTS
964        $(Q)ln -fsn `cd $(srctree) && /bin/pwd`/scripts/gdb/vmlinux-gdb.py
965endif
966        +$(call if_changed,link-vmlinux)
967
968# The actual objects are generated when descending,
969# make sure no implicit rule kicks in
970$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
971
972# Handle descending into subdirectories listed in $(vmlinux-dirs)
973# Preset locale variables to speed up the build process. Limit locale
974# tweaks to this spot to avoid wrong language settings when running
975# make menuconfig etc.
976# Error messages still appears in the original language
977
978PHONY += $(vmlinux-dirs)
979$(vmlinux-dirs): prepare scripts
980        $(Q)$(MAKE) $(build)=$@
981
982define filechk_kernel.release
983        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
984endef
985
986# Store (new) KERNELRELEASE string in include/config/kernel.release
987include/config/kernel.release: include/config/auto.conf FORCE
988        $(call filechk,kernel.release)
989
990
991# Things we need to do before we recursively start building the kernel
992# or the modules are listed in "prepare".
993# A multi level approach is used. prepareN is processed before prepareN-1.
994# archprepare is used in arch Makefiles and when processed asm symlink,
995# version.h and scripts_basic is processed / created.
996
997# Listed in dependency order
998PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
999
1000# prepare3 is used to check if we are building in a separate output directory,
1001# and if so do:
1002# 1) Check that make has not been executed in the kernel src $(srctree)
1003prepare3: include/config/kernel.release
1004ifneq ($(KBUILD_SRC),)
1005        @$(kecho) '  Using $(srctree) as source for kernel'
1006        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
1007                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
1008                echo >&2 "  in the '$(srctree)' directory.";\
1009                /bin/false; \
1010        fi;
1011endif
1012
1013# prepare2 creates a makefile if using a separate output directory
1014prepare2: prepare3 outputmakefile asm-generic
1015
1016prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
1017                   include/config/auto.conf
1018        $(cmd_crmodverdir)
1019
1020archprepare: archheaders archscripts prepare1 scripts_basic
1021
1022prepare0: archprepare FORCE
1023        $(Q)$(MAKE) $(build)=.
1024
1025# All the preparing..
1026prepare: prepare0
1027
1028# Generate some files
1029# ---------------------------------------------------------------------------
1030
1031# KERNELRELEASE can change from a few different places, meaning version.h
1032# needs to be updated, so this check is forced on all builds
1033
1034uts_len := 64
1035define filechk_utsrelease.h
1036        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1037          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1038          exit 1;                                                         \
1039        fi;                                                               \
1040        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1041endef
1042
1043define filechk_version.h
1044        (echo \#define LINUX_VERSION_CODE $(shell                         \
1045        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1046        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1047endef
1048
1049$(version_h): $(srctree)/Makefile FORCE
1050        $(call filechk,version.h)
1051        $(Q)rm -f $(old_version_h)
1052
1053include/generated/utsrelease.h: include/config/kernel.release FORCE
1054        $(call filechk,utsrelease.h)
1055
1056PHONY += headerdep
1057headerdep:
1058        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1059        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1060
1061# ---------------------------------------------------------------------------
1062# Firmware install
1063INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1064export INSTALL_FW_PATH
1065
1066PHONY += firmware_install
1067firmware_install: FORCE
1068        @mkdir -p $(objtree)/firmware
1069        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1070
1071# ---------------------------------------------------------------------------
1072# Kernel headers
1073
1074#Default location for installed headers
1075export INSTALL_HDR_PATH = $(objtree)/usr
1076
1077# If we do an all arch process set dst to asm-$(hdr-arch)
1078hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1079
1080PHONY += archheaders
1081archheaders:
1082
1083PHONY += archscripts
1084archscripts:
1085
1086PHONY += __headers
1087__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1088        $(Q)$(MAKE) $(build)=scripts build_unifdef
1089
1090PHONY += headers_install_all
1091headers_install_all:
1092        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1093
1094PHONY += headers_install
1095headers_install: __headers
1096        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1097          $(error Headers not exportable for the $(SRCARCH) architecture))
1098        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1099        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1100
1101PHONY += headers_check_all
1102headers_check_all: headers_install_all
1103        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1104
1105PHONY += headers_check
1106headers_check: headers_install
1107        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1108        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1109
1110# ---------------------------------------------------------------------------
1111# Kernel selftest
1112
1113PHONY += kselftest
1114kselftest:
1115        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1116
1117kselftest-clean:
1118        $(Q)$(MAKE) -C tools/testing/selftests clean
1119
1120# ---------------------------------------------------------------------------
1121# Modules
1122
1123ifdef CONFIG_MODULES
1124
1125# By default, build modules as well
1126
1127all: modules
1128
1129# Build modules
1130#
1131# A module can be listed more than once in obj-m resulting in
1132# duplicate lines in modules.order files.  Those are removed
1133# using awk while concatenating to the final file.
1134
1135PHONY += modules
1136modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1137        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1138        @$(kecho) '  Building modules, stage 2.';
1139        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1140        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1141
1142modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1143        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1144
1145%/modules.builtin: include/config/auto.conf
1146        $(Q)$(MAKE) $(modbuiltin)=$*
1147
1148
1149# Target to prepare building external modules
1150PHONY += modules_prepare
1151modules_prepare: prepare scripts
1152
1153# Target to install modules
1154PHONY += modules_install
1155modules_install: _modinst_ _modinst_post
1156
1157PHONY += _modinst_
1158_modinst_:
1159        @rm -rf $(MODLIB)/kernel
1160        @rm -f $(MODLIB)/source
1161        @mkdir -p $(MODLIB)/kernel
1162        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1163        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1164                rm -f $(MODLIB)/build ; \
1165                ln -s $(CURDIR) $(MODLIB)/build ; \
1166        fi
1167        @cp -f $(objtree)/modules.order $(MODLIB)/
1168        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1169        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1170
1171# This depmod is only for convenience to give the initial
1172# boot a modules.dep even before / is mounted read-write.  However the
1173# boot script depmod is the master version.
1174PHONY += _modinst_post
1175_modinst_post: _modinst_
1176        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1177        $(call cmd,depmod)
1178
1179ifeq ($(CONFIG_MODULE_SIG), y)
1180PHONY += modules_sign
1181modules_sign:
1182        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1183endif
1184
1185else # CONFIG_MODULES
1186
1187# Modules not configured
1188# ---------------------------------------------------------------------------
1189
1190modules modules_install: FORCE
1191        @echo >&2
1192        @echo >&2 "The present kernel configuration has modules disabled."
1193        @echo >&2 "Type 'make config' and enable loadable module support."
1194        @echo >&2 "Then build a kernel with module support enabled."
1195        @echo >&2
1196        @exit 1
1197
1198endif # CONFIG_MODULES
1199
1200###
1201# Cleaning is done on three levels.
1202# make clean     Delete most generated files
1203#                Leave enough to build external modules
1204# make mrproper  Delete the current configuration, and all generated files
1205# make distclean Remove editor backup files, patch leftover files and the like
1206
1207# Directories & files removed with 'make clean'
1208CLEAN_DIRS  += $(MODVERDIR)
1209
1210# Directories & files removed with 'make mrproper'
1211MRPROPER_DIRS  += include/config usr/include include/generated          \
1212                  arch/*/include/generated .tmp_objdiff
1213MRPROPER_FILES += .config .config.old .version .old_version \
1214                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1215                  signing_key.pem signing_key.priv signing_key.x509     \
1216                  x509.genkey extra_certificates signing_key.x509.keyid \
1217                  signing_key.x509.signer vmlinux-gdb.py
1218
1219# clean - Delete most, but leave enough to build external modules
1220#
1221clean: rm-dirs  := $(CLEAN_DIRS)
1222clean: rm-files := $(CLEAN_FILES)
1223clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1224
1225PHONY += $(clean-dirs) clean archclean vmlinuxclean
1226$(clean-dirs):
1227        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1228
1229vmlinuxclean:
1230        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1231
1232clean: archclean vmlinuxclean
1233
1234# mrproper - Delete all generated files, including .config
1235#
1236mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1237mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1238mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1239
1240PHONY += $(mrproper-dirs) mrproper archmrproper
1241$(mrproper-dirs):
1242        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1243
1244mrproper: clean archmrproper $(mrproper-dirs)
1245        $(call cmd,rmdirs)
1246        $(call cmd,rmfiles)
1247
1248# distclean
1249#
1250PHONY += distclean
1251
1252distclean: mrproper
1253        @find $(srctree) $(RCS_FIND_IGNORE) \
1254                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1255                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1256                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1257                -type f -print | xargs rm -f
1258
1259
1260# Packaging of the kernel to various formats
1261# ---------------------------------------------------------------------------
1262# rpm target kept for backward compatibility
1263package-dir     := scripts/package
1264
1265%src-pkg: FORCE
1266        $(Q)$(MAKE) $(build)=$(package-dir) $@
1267%pkg: include/config/kernel.release FORCE
1268        $(Q)$(MAKE) $(build)=$(package-dir) $@
1269rpm: include/config/kernel.release FORCE
1270        $(Q)$(MAKE) $(build)=$(package-dir) $@
1271
1272
1273# Brief documentation of the typical targets used
1274# ---------------------------------------------------------------------------
1275
1276boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1277boards := $(sort $(notdir $(boards)))
1278board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1279board-dirs := $(sort $(notdir $(board-dirs:/=)))
1280
1281help:
1282        @echo  'Cleaning targets:'
1283        @echo  '  clean           - Remove most generated files but keep the config and'
1284        @echo  '                    enough build support to build external modules'
1285        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1286        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1287        @echo  ''
1288        @echo  'Configuration targets:'
1289        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1290        @echo  ''
1291        @echo  'Other generic targets:'
1292        @echo  '  all             - Build all targets marked with [*]'
1293        @echo  '* vmlinux         - Build the bare kernel'
1294        @echo  '* modules         - Build all modules'
1295        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1296        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1297        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1298        @echo  '  dir/            - Build all files in dir and below'
1299        @echo  '  dir/file.[ois]  - Build specified target only'
1300        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1301        @echo  '                    (requires a recent binutils and recent build (System.map))'
1302        @echo  '  dir/file.ko     - Build module including final link'
1303        @echo  '  modules_prepare - Set up for building external modules'
1304        @echo  '  tags/TAGS       - Generate tags file for editors'
1305        @echo  '  cscope          - Generate cscope index'
1306        @echo  '  gtags           - Generate GNU GLOBAL index'
1307        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1308        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1309        @echo  '  image_name      - Output the image name (use with make -s)'
1310        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1311         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1312         echo  ''
1313        @echo  'Static analysers'
1314        @echo  '  checkstack      - Generate a list of stack hogs'
1315        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1316        @echo  '  versioncheck    - Sanity check on version.h usage'
1317        @echo  '  includecheck    - Check for duplicate included header files'
1318        @echo  '  export_report   - List the usages of all exported symbols'
1319        @echo  '  headers_check   - Sanity check on exported headers'
1320        @echo  '  headerdep       - Detect inclusion cycles in headers'
1321        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1322        @echo  ''
1323        @echo  'Kernel selftest'
1324        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1325        @echo  '                    Build, install, and boot kernel before'
1326        @echo  '                    running kselftest on it'
1327        @echo  '  kselftest-clean - Remove all generated kselftest files'
1328        @echo  ''
1329        @echo  'Kernel packaging:'
1330        @$(MAKE) $(build)=$(package-dir) help
1331        @echo  ''
1332        @echo  'Documentation targets:'
1333        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1334        @echo  ''
1335        @echo  'Architecture specific targets ($(SRCARCH)):'
1336        @$(if $(archhelp),$(archhelp),\
1337                echo '  No architecture specific help defined for $(SRCARCH)')
1338        @echo  ''
1339        @$(if $(boards), \
1340                $(foreach b, $(boards), \
1341                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1342                echo '')
1343        @$(if $(board-dirs), \
1344                $(foreach b, $(board-dirs), \
1345                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1346                printf "  %-16s - Show all of the above\\n" help-boards; \
1347                echo '')
1348
1349        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1350        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1351        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1352        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1353        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1354        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1355        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1356        @echo  '                1: warnings which may be relevant and do not occur too often'
1357        @echo  '                2: warnings which occur quite often but may still be relevant'
1358        @echo  '                3: more obscure warnings, can most likely be ignored'
1359        @echo  '                Multiple levels can be combined with W=12 or W=123'
1360        @echo  ''
1361        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1362        @echo  'For further info see the ./README file'
1363
1364
1365help-board-dirs := $(addprefix help-,$(board-dirs))
1366
1367help-boards: $(help-board-dirs)
1368
1369boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1370
1371$(help-board-dirs): help-%:
1372        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1373        @$(if $(boards-per-dir), \
1374                $(foreach b, $(boards-per-dir), \
1375                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1376                echo '')
1377
1378
1379# Documentation targets
1380# ---------------------------------------------------------------------------
1381%docs: scripts_basic FORCE
1382        $(Q)$(MAKE) $(build)=scripts build_docproc build_check-lc_ctype
1383        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1384
1385else # KBUILD_EXTMOD
1386
1387###
1388# External module support.
1389# When building external modules the kernel used as basis is considered
1390# read-only, and no consistency checks are made and the make
1391# system is not used on the basis kernel. If updates are required
1392# in the basis kernel ordinary make commands (without M=...) must
1393# be used.
1394#
1395# The following are the only valid targets when building external
1396# modules.
1397# make M=dir clean     Delete all automatically generated files
1398# make M=dir modules   Make all modules in specified dir
1399# make M=dir           Same as 'make M=dir modules'
1400# make M=dir modules_install
1401#                      Install the modules built in the module directory
1402#                      Assumes install directory is already created
1403
1404# We are always building modules
1405KBUILD_MODULES := 1
1406PHONY += crmodverdir
1407crmodverdir:
1408        $(cmd_crmodverdir)
1409
1410PHONY += $(objtree)/Module.symvers
1411$(objtree)/Module.symvers:
1412        @test -e $(objtree)/Module.symvers || ( \
1413        echo; \
1414        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1415        echo "           is missing; modules will have no dependencies and modversions."; \
1416        echo )
1417
1418module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1419PHONY += $(module-dirs) modules
1420$(module-dirs): crmodverdir $(objtree)/Module.symvers
1421        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1422
1423modules: $(module-dirs)
1424        @$(kecho) '  Building modules, stage 2.';
1425        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1426
1427PHONY += modules_install
1428modules_install: _emodinst_ _emodinst_post
1429
1430install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1431PHONY += _emodinst_
1432_emodinst_:
1433        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1434        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1435
1436PHONY += _emodinst_post
1437_emodinst_post: _emodinst_
1438        $(call cmd,depmod)
1439
1440clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1441
1442PHONY += $(clean-dirs) clean
1443$(clean-dirs):
1444        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1445
1446clean:  rm-dirs := $(MODVERDIR)
1447clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1448
1449help:
1450        @echo  '  Building external modules.'
1451        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1452        @echo  ''
1453        @echo  '  modules         - default target, build the module(s)'
1454        @echo  '  modules_install - install the module'
1455        @echo  '  clean           - remove generated files in module directory only'
1456        @echo  ''
1457
1458# Dummies...
1459PHONY += prepare scripts
1460prepare: ;
1461scripts: ;
1462endif # KBUILD_EXTMOD
1463
1464clean: $(clean-dirs)
1465        $(call cmd,rmdirs)
1466        $(call cmd,rmfiles)
1467        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1468                \( -name '*.[oa]' -o -name '*.ko' -o -name '.*.cmd' \
1469                -o -name '*.ko.*' \
1470                -o -name '*.dwo'  \
1471                -o -name '*.su'  \
1472                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1473                -o -name '*.symtypes' -o -name 'modules.order' \
1474                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1475                -o -name '*.gcno' \) -type f -print | xargs rm -f
1476
1477# Generate tags for editors
1478# ---------------------------------------------------------------------------
1479quiet_cmd_tags = GEN     $@
1480      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1481
1482tags TAGS cscope gtags: FORCE
1483        $(call cmd,tags)
1484
1485# Scripts to check various things for consistency
1486# ---------------------------------------------------------------------------
1487
1488PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1489
1490includecheck:
1491        find $(srctree)/* $(RCS_FIND_IGNORE) \
1492                -name '*.[hcS]' -type f -print | sort \
1493                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1494
1495versioncheck:
1496        find $(srctree)/* $(RCS_FIND_IGNORE) \
1497                -name '*.[hcS]' -type f -print | sort \
1498                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1499
1500coccicheck:
1501        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1502
1503namespacecheck:
1504        $(PERL) $(srctree)/scripts/namespace.pl
1505
1506export_report:
1507        $(PERL) $(srctree)/scripts/export_report.pl
1508
1509endif #ifeq ($(config-targets),1)
1510endif #ifeq ($(mixed-targets),1)
1511
1512PHONY += checkstack kernelrelease kernelversion image_name
1513
1514# UML needs a little special treatment here.  It wants to use the host
1515# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1516# else wants $(ARCH), including people doing cross-builds, which means
1517# that $(SUBARCH) doesn't work here.
1518ifeq ($(ARCH), um)
1519CHECKSTACK_ARCH := $(SUBARCH)
1520else
1521CHECKSTACK_ARCH := $(ARCH)
1522endif
1523checkstack:
1524        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1525        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1526
1527kernelrelease:
1528        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1529
1530kernelversion:
1531        @echo $(KERNELVERSION)
1532
1533image_name:
1534        @echo $(KBUILD_IMAGE)
1535
1536# Clear a bunch of variables before executing the submake
1537tools/: FORCE
1538        $(Q)mkdir -p $(objtree)/tools
1539        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/
1540
1541tools/%: FORCE
1542        $(Q)mkdir -p $(objtree)/tools
1543        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(shell cd $(objtree) && /bin/pwd) subdir=tools -C $(src)/tools/ $*
1544
1545# Single targets
1546# ---------------------------------------------------------------------------
1547# Single targets are compatible with:
1548# - build with mixed source and output
1549# - build with separate output dir 'make O=...'
1550# - external modules
1551#
1552#  target-dir => where to store outputfile
1553#  build-dir  => directory in kernel source tree to use
1554
1555ifeq ($(KBUILD_EXTMOD),)
1556        build-dir  = $(patsubst %/,%,$(dir $@))
1557        target-dir = $(dir $@)
1558else
1559        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1560        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1561        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1562endif
1563
1564%.s: %.c prepare scripts FORCE
1565        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1566%.i: %.c prepare scripts FORCE
1567        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1568%.o: %.c prepare scripts FORCE
1569        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1570%.lst: %.c prepare scripts FORCE
1571        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1572%.s: %.S prepare scripts FORCE
1573        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1574%.o: %.S prepare scripts FORCE
1575        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1576%.symtypes: %.c prepare scripts FORCE
1577        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1578
1579# Modules
1580/: prepare scripts FORCE
1581        $(cmd_crmodverdir)
1582        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1583        $(build)=$(build-dir)
1584# Make sure the latest headers are built for Documentation
1585Documentation/: headers_install
1586%/: prepare scripts FORCE
1587        $(cmd_crmodverdir)
1588        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1589        $(build)=$(build-dir)
1590%.ko: prepare scripts FORCE
1591        $(cmd_crmodverdir)
1592        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1593        $(build)=$(build-dir) $(@:.ko=.o)
1594        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1595
1596# FIXME Should go into a make.lib or something
1597# ===========================================================================
1598
1599quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1600      cmd_rmdirs = rm -rf $(rm-dirs)
1601
1602quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1603      cmd_rmfiles = rm -f $(rm-files)
1604
1605# Run depmod only if we have System.map and depmod is executable
1606quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1607      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1608                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1609
1610# Create temporary dir for module support files
1611# clean it up only when building all modules
1612cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1613                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1614
1615# read all saved command lines
1616
1617targets := $(wildcard $(sort $(targets)))
1618cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1619
1620ifneq ($(cmd_files),)
1621  $(cmd_files): ;       # Do not try to update included dependency files
1622  include $(cmd_files)
1623endif
1624
1625endif   # skip-makefile
1626
1627PHONY += FORCE
1628FORCE:
1629
1630# Declare the contents of the .PHONY variable as phony.  We keep that
1631# information in a variable so we can use it in if_changed and friends.
1632.PHONY: $(PHONY)
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