source: src/linux/universal/linux-3.18/Makefile @ 31869

Last change on this file since 31869 was 31869, checked in by brainslayer, 9 days ago

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1VERSION = 3
2PATCHLEVEL = 18
3SUBLEVEL = 49
4EXTRAVERSION = -rc1
5NAME = Diseased Newt
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 use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15MAKEFLAGS += -rR
16
17# Avoid funny character set dependencies
18unexport LC_ALL
19LC_COLLATE=C
20LC_NUMERIC=C
21export LC_COLLATE LC_NUMERIC
22
23# Avoid interference with shell env settings
24unexport GREP_OPTIONS
25
26# We are using a recursive build, so we need to do a little thinking
27# to get the ordering right.
28#
29# Most importantly: sub-Makefiles should only ever modify files in
30# their own directory. If in some directory we have a dependency on
31# a file in another dir (which doesn't happen often, but it's often
32# unavoidable when linking the built-in.o targets which finally
33# turn into vmlinux), we will call a sub make in that other dir, and
34# after that we are sure that everything which is in that other dir
35# is now up to date.
36#
37# The only cases where we need to modify files which have global
38# effects are thus separated out and done before the recursive
39# descending is started. They are now explicitly listed as the
40# prepare rule.
41
42# Beautify output
43# ---------------------------------------------------------------------------
44#
45# Normally, we echo the whole command before executing it. By making
46# that echo $($(quiet)$(cmd)), we now have the possibility to set
47# $(quiet) to choose other forms of output instead, e.g.
48#
49#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
51#
52# If $(quiet) is empty, the whole command will be printed.
53# If it is set to "quiet_", only the short version will be printed.
54# If it is set to "silent_", nothing will be printed at all, since
55# the variable $(silent_cmd_cc_o_c) doesn't exist.
56#
57# A simple variant is to prefix commands with $(Q) - that's useful
58# for commands that shall be hidden in non-verbose mode.
59#
60#       $(Q)ln $@ :<
61#
62# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64#
65# To put more focus on warnings, be less verbose as default
66# Use 'make V=1' to see the full commands
67
68ifeq ("$(origin V)", "command line")
69  KBUILD_VERBOSE = $(V)
70endif
71ifndef KBUILD_VERBOSE
72  KBUILD_VERBOSE = 0
73endif
74
75ifeq ($(KBUILD_VERBOSE),1)
76  quiet =
77  Q =
78else
79  quiet=quiet_
80  Q = @
81endif
82
83# If the user is running make -s (silent mode), suppress echoing of
84# commands
85
86ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88  quiet=silent_
89endif
90else                                    # make-3.8x
91ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92  quiet=silent_
93endif
94endif
95
96export quiet Q KBUILD_VERBOSE
97
98# kbuild supports saving output files in a separate directory.
99# To locate output files in a separate directory two syntaxes are supported.
100# In both cases the working directory must be the root of the kernel src.
101# 1) O=
102# Use "make O=dir/to/store/output/files/"
103#
104# 2) Set KBUILD_OUTPUT
105# Set the environment variable KBUILD_OUTPUT to point to the directory
106# where the output files shall be placed.
107# export KBUILD_OUTPUT=dir/to/store/output/files/
108# make
109#
110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111# variable.
112
113# KBUILD_SRC is set on invocation of make in OBJ directory
114# KBUILD_SRC is not intended to be used by the regular user (for now)
115ifeq ($(KBUILD_SRC),)
116
117# OK, Make called in directory where kernel src resides
118# Do we want to locate output files in a separate directory?
119ifeq ("$(origin O)", "command line")
120  KBUILD_OUTPUT := $(O)
121endif
122
123# That's our default target when none is given on the command line
124PHONY := _all
125_all:
126
127# Cancel implicit rules on top Makefile
128$(CURDIR)/Makefile Makefile: ;
129
130ifneq ($(KBUILD_OUTPUT),)
131# Invoke a second make in the output directory, passing relevant variables
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135                                                                && /bin/pwd)
136$(if $(KBUILD_OUTPUT),, \
137     $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142        @:
143
144sub-make: FORCE
145        $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
146        -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
147
148# Leave processing to above invocation of make
149skip-makefile := 1
150endif # ifneq ($(KBUILD_OUTPUT),)
151endif # ifeq ($(KBUILD_SRC),)
152
153# We process the rest of the Makefile if this is the final invocation of make
154ifeq ($(skip-makefile),)
155
156# Do not print "Entering directory ...",
157# but we want to display it when entering to the output directory
158# so that IDEs/editors are able to understand relative filenames.
159MAKEFLAGS += --no-print-directory
160
161# Call a source code checker (by default, "sparse") as part of the
162# C compilation.
163#
164# Use 'make C=1' to enable checking of only re-compiled files.
165# Use 'make C=2' to enable checking of *all* source files, regardless
166# of whether they are re-compiled or not.
167#
168# See the file "Documentation/sparse.txt" for more details, including
169# where to get the "sparse" utility.
170
171ifeq ("$(origin C)", "command line")
172  KBUILD_CHECKSRC = $(C)
173endif
174ifndef KBUILD_CHECKSRC
175  KBUILD_CHECKSRC = 0
176endif
177
178# Use make M=dir to specify directory of external module to build
179# Old syntax make ... SUBDIRS=$PWD is still supported
180# Setting the environment variable KBUILD_EXTMOD take precedence
181ifdef SUBDIRS
182  KBUILD_EXTMOD ?= $(SUBDIRS)
183endif
184
185ifeq ("$(origin M)", "command line")
186  KBUILD_EXTMOD := $(M)
187endif
188
189# If building an external module we do not care about the all: rule
190# but instead _all depend on modules
191PHONY += all
192ifeq ($(KBUILD_EXTMOD),)
193_all: all
194else
195_all: modules
196endif
197
198ifeq ($(KBUILD_SRC),)
199        # building in the source tree
200        srctree := .
201else
202        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203                # building in a subdirectory of the source tree
204                srctree := ..
205        else
206                srctree := $(KBUILD_SRC)
207        endif
208endif
209objtree         := .
210src             := $(srctree)
211obj             := $(objtree)
212
213VPATH           := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
214
215export srctree objtree VPATH
216
217
218# SUBARCH tells the usermode build what the underlying arch is.  That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below.  If a native build is happening,
221# then ARCH is assigned, getting whatever value it gets normally, and
222# SUBARCH is subsequently ignored.
223ifeq ($(ARCH),armeb)
224ARCH := arm
225endif
226ifeq ($(ARCH),mips64)
227ARCH := mips
228endif
229ifeq ($(ARCH),mipsel)
230ARCH=mips
231endif
232
233SUBARCH := $(ARCH)
234
235# Cross compiling and selecting different set of gcc/bin-utils
236# ---------------------------------------------------------------------------
237#
238# When performing cross compilation for other architectures ARCH shall be set
239# to the target architecture. (See arch/* for the possibilities).
240# ARCH can be set during invocation of make:
241# make ARCH=ia64
242# Another way is to have ARCH set in the environment.
243# The default ARCH is the host where make is executed.
244
245# CROSS_COMPILE specify the prefix used for all executables used
246# during compilation. Only gcc and related bin-utils executables
247# are prefixed with $(CROSS_COMPILE).
248# CROSS_COMPILE can be set on the command line
249# make CROSS_COMPILE=ia64-linux-
250# Alternatively CROSS_COMPILE can be set in the environment.
251# A third alternative is to store a setting in .config so that plain
252# "make" in the configured kernel build directory always uses that.
253# Default value for CROSS_COMPILE is not to prefix executables
254# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
255ARCH            ?= $(SUBARCH)
256CROSS_COMPILE   ?= ccache $(CONFIG_CROSS_COMPILE:"%"=%)
257
258# Architecture as present in compile.h
259UTS_MACHINE     := $(ARCH)
260SRCARCH         := $(ARCH)
261
262# Additional ARCH settings for x86
263ifeq ($(ARCH),i386)
264        SRCARCH := x86
265endif
266ifeq ($(ARCH),x86_64)
267        SRCARCH := x86
268endif
269
270# Additional ARCH settings for sparc
271ifeq ($(ARCH),sparc32)
272       SRCARCH := sparc
273endif
274ifeq ($(ARCH),sparc64)
275       SRCARCH := sparc
276endif
277
278# Additional ARCH settings for sh
279ifeq ($(ARCH),sh64)
280       SRCARCH := sh
281endif
282
283# Additional ARCH settings for tile
284ifeq ($(ARCH),tilepro)
285       SRCARCH := tile
286endif
287ifeq ($(ARCH),tilegx)
288       SRCARCH := tile
289endif
290
291# Where to locate arch specific headers
292hdr-arch  := $(SRCARCH)
293
294KCONFIG_CONFIG  ?= .config
295export KCONFIG_CONFIG
296
297# SHELL used by kbuild
298CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
299          else if [ -x /bin/bash ]; then echo /bin/bash; \
300          else echo sh; fi ; fi)
301
302HOSTCC       = gcc
303HOSTCXX      = g++
304HOSTCFLAGS   = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
305HOSTCXXFLAGS = -O2
306
307ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
308HOSTCFLAGS  += -Wno-unused-value -Wno-unused-parameter \
309                -Wno-missing-field-initializers -fno-delete-null-pointer-checks
310endif
311
312# Decide whether to build built-in, modular, or both.
313# Normally, just do built-in.
314
315KBUILD_MODULES :=
316KBUILD_BUILTIN := 1
317
318# If we have only "make modules", don't compile built-in objects.
319# When we're building modules with modversions, we need to consider
320# the built-in objects during the descend as well, in order to
321# make sure the checksums are up to date before we record them.
322
323ifeq ($(MAKECMDGOALS),modules)
324  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
325endif
326
327# If we have "make <whatever> modules", compile modules
328# in addition to whatever we do anyway.
329# Just "make" or "make all" shall build modules as well
330
331ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
332  KBUILD_MODULES := 1
333endif
334
335ifeq ($(MAKECMDGOALS),)
336  KBUILD_MODULES := 1
337endif
338
339export KBUILD_MODULES KBUILD_BUILTIN
340export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
341
342ifneq ($(CC),)
343ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
344COMPILER := clang
345else
346COMPILER := gcc
347endif
348export COMPILER
349endif
350
351# Look for make include files relative to root of kernel src
352MAKEFLAGS += --include-dir=$(srctree)
353
354# We need some generic definitions (do not try to remake the file).
355$(srctree)/scripts/Kbuild.include: ;
356include $(srctree)/scripts/Kbuild.include
357
358# Make variables (CC, etc...)
359AS              = $(CROSS_COMPILE)as
360LD              = $(CROSS_COMPILE)ld
361CC              = $(CROSS_COMPILE)gcc
362CPP             = $(CC) -E
363AR              = $(CROSS_COMPILE)ar
364NM              = $(CROSS_COMPILE)nm
365STRIP           = $(CROSS_COMPILE)strip
366OBJCOPY         = $(CROSS_COMPILE)objcopy
367OBJDUMP         = $(CROSS_COMPILE)objdump
368AWK             = awk
369GENKSYMS        = scripts/genksyms/genksyms
370INSTALLKERNEL  := installkernel
371DEPMOD          = /sbin/depmod
372PERL            = perl
373PYTHON          = python
374CHECK           = sparse
375
376CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
377                  -Wbitwise -Wno-return-void $(CF)
378CFLAGS_MODULE   =
379AFLAGS_MODULE   =
380LDFLAGS_MODULE  =
381CFLAGS_KERNEL   =
382AFLAGS_KERNEL   =
383CFLAGS_GCOV     = -fprofile-arcs -ftest-coverage -fno-tree-loop-im
384
385
386# Use USERINCLUDE when you must reference the UAPI directories only.
387USERINCLUDE    := \
388                -I$(srctree)/arch/$(hdr-arch)/include/uapi \
389                -Iarch/$(hdr-arch)/include/generated/uapi \
390                -I$(srctree)/include/uapi \
391                -Iinclude/generated/uapi \
392                -include $(srctree)/include/linux/kconfig.h
393
394# Use LINUXINCLUDE when you must reference the include/ directory.
395# Needed to be compatible with the O= option
396LINUXINCLUDE    := \
397                -I$(srctree)/arch/$(hdr-arch)/include \
398                -Iarch/$(hdr-arch)/include/generated \
399                $(if $(KBUILD_SRC), -I$(srctree)/include) \
400                -Iinclude \
401                $(USERINCLUDE)
402
403KBUILD_CPPFLAGS := -D__KERNEL__
404
405KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
406                   -fno-strict-aliasing -fno-common \
407                   -Werror-implicit-function-declaration \
408                   -Wno-format-security \
409                   -std=gnu89
410
411KBUILD_AFLAGS_KERNEL :=
412KBUILD_CFLAGS_KERNEL :=
413KBUILD_AFLAGS   := -D__ASSEMBLY__
414KBUILD_AFLAGS_MODULE  := -DMODULE
415KBUILD_CFLAGS_MODULE  := -DMODULE
416KBUILD_LDFLAGS_MODULE = -T $(srctree)/scripts/module-common.lds $(if $(CONFIG_PROFILING),,-s)
417
418
419# Read KERNELRELEASE from include/config/kernel.release (if it exists)
420KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
421KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
422
423export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
424export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
425export CPP AR NM STRIP OBJCOPY OBJDUMP
426export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
427export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
428
429export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
430export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
431export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
432export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
433export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
434export KBUILD_ARFLAGS
435
436# When compiling out-of-tree modules, put MODVERDIR in the module
437# tree rather than in the kernel tree. The kernel tree might
438# even be read-only.
439export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
440
441# Files to ignore in find ... statements
442
443export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
444                          -name CVS -o -name .pc -o -name .hg -o -name .git \) \
445                          -prune -o
446export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
447                         --exclude CVS --exclude .pc --exclude .hg --exclude .git
448
449# ===========================================================================
450# Rules shared between *config targets and build targets
451
452# Basic helpers built in scripts/
453PHONY += scripts_basic
454scripts_basic:
455        $(Q)$(MAKE) $(build)=scripts/basic
456        $(Q)rm -f .tmp_quiet_recordmcount
457
458# To avoid any implicit rule to kick in, define an empty command.
459scripts/basic/%: scripts_basic ;
460
461PHONY += outputmakefile
462# outputmakefile generates a Makefile in the output directory, if using a
463# separate output directory. This allows convenient use of make in the
464# output directory.
465outputmakefile:
466ifneq ($(KBUILD_SRC),)
467        $(Q)ln -fsn $(srctree) source
468        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
469            $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
470endif
471
472# Support for using generic headers in asm-generic
473PHONY += asm-generic
474asm-generic:
475        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
476                    src=asm obj=arch/$(SRCARCH)/include/generated/asm
477        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
478                    src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
479
480# To make sure we do not include .config for any of the *config targets
481# catch them early, and hand them over to scripts/kconfig/Makefile
482# It is allowed to specify more targets when calling make, including
483# mixing *config targets and build targets.
484# For example 'make oldconfig all'.
485# Detect when mixed targets is specified, and make a second invocation
486# of make so .config is not included in this case either (for *config).
487
488version_h := include/generated/uapi/linux/version.h
489
490no-dot-config-targets := clean mrproper distclean \
491                         cscope gtags TAGS tags help %docs check% coccicheck \
492                         $(version_h) headers_% archheaders archscripts \
493                         kernelversion %src-pkg
494
495config-targets := 0
496mixed-targets  := 0
497dot-config     := 1
498
499ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
500        ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
501                dot-config := 0
502        endif
503endif
504
505ifeq ($(KBUILD_EXTMOD),)
506        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
507                config-targets := 1
508                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
509                        mixed-targets := 1
510                endif
511        endif
512endif
513
514ifeq ($(mixed-targets),1)
515# ===========================================================================
516# We're called with mixed targets (*config and build targets).
517# Handle them one by one.
518
519PHONY += $(MAKECMDGOALS) __build_one_by_one
520
521$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
522        @:
523
524__build_one_by_one:
525        $(Q)set -e; \
526        for i in $(MAKECMDGOALS); do \
527                $(MAKE) -f $(srctree)/Makefile $$i; \
528        done
529
530else
531ifeq ($(config-targets),1)
532# ===========================================================================
533# *config targets only - make sure prerequisites are updated, and descend
534# in scripts/kconfig to make the *config target
535
536# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
537# KBUILD_DEFCONFIG may point out an alternative default configuration
538# used for 'make defconfig'
539include $(srctree)/arch/$(SRCARCH)/Makefile
540export KBUILD_DEFCONFIG KBUILD_KCONFIG
541
542config: scripts_basic outputmakefile FORCE
543        $(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545%config: scripts_basic outputmakefile FORCE
546        $(Q)$(MAKE) $(build)=scripts/kconfig $@
547
548else
549# ===========================================================================
550# Build targets only - this includes vmlinux, arch specific targets, clean
551# targets and others. In general all targets except *config targets.
552
553ifeq ($(KBUILD_EXTMOD),)
554# Additional helpers built in scripts/
555# Carefully list dependencies so we do not try to build scripts twice
556# in parallel
557PHONY += scripts
558scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
559         asm-generic
560        $(Q)$(MAKE) $(build)=$(@)
561
562# Objects we will link into vmlinux / subdirs we need to visit
563init-y          := init/
564drivers-y       := drivers/ sound/ firmware/
565net-y           := net/
566libs-y          := lib/
567core-y          := usr/
568endif # KBUILD_EXTMOD
569
570ifeq ($(dot-config),1)
571# Read in config
572-include include/config/auto.conf
573
574ifeq ($(KBUILD_EXTMOD),)
575# Read in dependencies to all Kconfig* files, make sure to run
576# oldconfig if changes are detected.
577-include include/config/auto.conf.cmd
578
579# To avoid any implicit rule to kick in, define an empty command
580$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
581
582# If .config is newer than include/config/auto.conf, someone tinkered
583# with it and forgot to run make oldconfig.
584# if auto.conf.cmd is missing then we are probably in a cleaned tree so
585# we execute the config step to be sure to catch updated Kconfig files
586include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
587        $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
588else
589# external modules needs include/generated/autoconf.h and include/config/auto.conf
590# but do not care if they are up-to-date. Use auto.conf to trigger the test
591PHONY += include/config/auto.conf
592
593include/config/auto.conf:
594        $(Q)test -e include/generated/autoconf.h -a -e $@ || (          \
595        echo >&2;                                                       \
596        echo >&2 "  ERROR: Kernel configuration is invalid.";           \
597        echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
598        echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
599        echo >&2 ;                                                      \
600        /bin/false)
601
602endif # KBUILD_EXTMOD
603
604else
605# Dummy target needed, because used as prerequisite
606include/config/auto.conf: ;
607endif # $(dot-config)
608
609# The all: target is the default when no target is given on the
610# command line.
611# This allow a user to issue only 'make' to build a kernel including modules
612# Defaults to vmlinux, but the arch makefile usually adds further targets
613all: vmlinux
614
615include $(srctree)/arch/$(SRCARCH)/Makefile
616
617KBUILD_CFLAGS   += $(call cc-option,-fno-delete-null-pointer-checks,)
618KBUILD_CFLAGS   += $(call cc-disable-warning,frame-address,)
619KBUILD_CFLAGS   += $(call cc-option,-fno-PIE)
620KBUILD_AFLAGS   += $(call cc-option,-fno-PIE)
621
622
623ifneq ($(CONFIG_PROXYARP),)
624KBUILD_CFLAGS += -DPROXYARP
625endif
626
627ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
628KBUILD_CFLAGS   += -Os -fno-caller-saves  $(call cc-disable-warning,maybe-uninitialized,)
629else
630KBUILD_CFLAGS   += -O2 -fno-reorder-blocks -fno-tree-ch -fno-caller-saves
631endif
632
633ifdef CONFIG_BCM47XX
634KBUILD_CFLAGS += -DBCMDRIVER -Dlinux
635KBUILD_AFLAGS += -DBCMDRIVER -Dlinux
636endif
637
638
639# Tell gcc to never replace conditional load with a non-conditional one
640KBUILD_CFLAGS   += $(call cc-option,--param=allow-store-data-races=0)
641
642ifdef CONFIG_READABLE_ASM
643# Disable optimizations that make assembler listings hard to read.
644# reorder blocks reorders the control in the function
645# ipa clone creates specialized cloned functions
646# partial inlining inlines only parts of functions
647KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
648                 $(call cc-option,-fno-ipa-cp-clone,) \
649                 $(call cc-option,-fno-partial-inlining)
650endif
651
652ifneq ($(CONFIG_FRAME_WARN),0)
653KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
654endif
655
656# Handle stack protector mode.
657#
658# Since kbuild can potentially perform two passes (first with the old
659# .config values and then with updated .config values), we cannot error out
660# if a desired compiler option is unsupported. If we were to error, kbuild
661# could never get to the second pass and actually notice that we changed
662# the option to something that was supported.
663#
664# Additionally, we don't want to fallback and/or silently change which compiler
665# flags will be used, since that leads to producing kernels with different
666# security feature characteristics depending on the compiler used. ("But I
667# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
668#
669# The middle ground is to warn here so that the failed option is obvious, but
670# to let the build fail with bad compiler flags so that we can't produce a
671# kernel when there is a CONFIG and compiler mismatch.
672#
673ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
674  stackp-flag := -fstack-protector
675  ifeq ($(call cc-option, $(stackp-flag)),)
676    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
677             -fstack-protector not supported by compiler)
678  endif
679else
680ifdef CONFIG_CC_STACKPROTECTOR_STRONG
681  stackp-flag := -fstack-protector-strong
682  ifeq ($(call cc-option, $(stackp-flag)),)
683    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
684              -fstack-protector-strong not supported by compiler)
685  endif
686else
687  # Force off for distro compilers that enable stack protector by default.
688  stackp-flag := $(call cc-option, -fno-stack-protector)
689endif
690endif
691KBUILD_CFLAGS += $(stackp-flag)
692
693ifeq ($(COMPILER),clang)
694KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
695KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
696KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
697KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
698KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
699# Quiet clang warning: comparison of unsigned expression < 0 is always false
700KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
701# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
702# source of a reference will be _MergedGlobals and not on of the whitelisted names.
703# See modpost pattern 2
704KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
705KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
706else
707
708# These warnings generated too much noise in a regular build.
709# Use make W=1 to enable them (see scripts/Makefile.build)
710KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
711KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
712endif
713
714ifdef CONFIG_FRAME_POINTER
715KBUILD_CFLAGS   += -fno-omit-frame-pointer -fno-optimize-sibling-calls
716else
717# Some targets (ARM with Thumb2, for example), can't be built with frame
718# pointers.  For those, we don't have FUNCTION_TRACER automatically
719# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
720# incompatible with -fomit-frame-pointer with current GCC, so we don't use
721# -fomit-frame-pointer with FUNCTION_TRACER.
722ifndef CONFIG_FUNCTION_TRACER
723KBUILD_CFLAGS   += -fomit-frame-pointer
724endif
725endif
726
727KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
728
729ifdef CONFIG_DEBUG_INFO
730ifdef CONFIG_DEBUG_INFO_SPLIT
731KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
732else
733KBUILD_CFLAGS   += -g
734endif
735KBUILD_AFLAGS   += -Wa,-gdwarf-2
736endif
737ifdef CONFIG_DEBUG_INFO_DWARF4
738KBUILD_CFLAGS   += $(call cc-option, -gdwarf-4,)
739endif
740
741ifdef CONFIG_DEBUG_INFO_REDUCED
742KBUILD_CFLAGS   += $(call cc-option, -femit-struct-debug-baseonly) \
743                   $(call cc-option,-fno-var-tracking)
744endif
745
746ifdef CONFIG_FUNCTION_TRACER
747ifdef CONFIG_HAVE_FENTRY
748CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
749endif
750KBUILD_CFLAGS   += -pg $(CC_USING_FENTRY)
751KBUILD_AFLAGS   += $(CC_USING_FENTRY)
752ifdef CONFIG_DYNAMIC_FTRACE
753        ifdef CONFIG_HAVE_C_RECORDMCOUNT
754                BUILD_C_RECORDMCOUNT := y
755                export BUILD_C_RECORDMCOUNT
756        endif
757endif
758endif
759
760# We trigger additional mismatches with less inlining
761ifdef CONFIG_DEBUG_SECTION_MISMATCH
762KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
763endif
764
765# arch Makefile may override CC so keep this after arch Makefile is included
766NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
767CHECKFLAGS     += $(NOSTDINC_FLAGS)
768
769# improve gcc optimization
770CFLAGS += $(call cc-option,-funit-at-a-time,)
771
772# warn about C99 declaration after statement
773KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
774
775# disable pointer signed / unsigned warnings in gcc 4.0
776KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
777
778# disable invalid "can't wrap" optimizations for signed / pointers
779KBUILD_CFLAGS   += $(call cc-option,-fno-strict-overflow)
780
781# conserve stack if available
782KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
783
784# disallow errors like 'EXPORT_GPL(foo);' with missing header
785KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
786
787# require functions to have arguments in prototypes, not empty 'int foo()'
788KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
789
790# Prohibit date/time macros, which would make the build non-deterministic
791KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
792
793# use the deterministic mode of AR if available
794KBUILD_ARFLAGS := $(call ar-option,D)
795
796# check for 'asm goto'
797ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
798        KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
799endif
800
801include $(srctree)/scripts/Makefile.extrawarn
802
803# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
804KBUILD_CPPFLAGS += $(KCPPFLAGS)
805KBUILD_AFLAGS += $(KAFLAGS)
806KBUILD_CFLAGS += $(KCFLAGS)
807
808# Use --build-id when available.
809LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
810                              $(call cc-ldoption, -Wl$(comma)--build-id,))
811KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
812LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
813
814ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
815LDFLAGS_vmlinux += $(call ld-option, -X,)
816endif
817
818# Default kernel image to build when no specific target is given.
819# KBUILD_IMAGE may be overruled on the command line or
820# set in the environment
821# Also any assignments in arch/$(ARCH)/Makefile take precedence over
822# this default value
823export KBUILD_IMAGE ?= vmlinux
824
825#
826# INSTALL_PATH specifies where to place the updated kernel and system map
827# images. Default is /boot, but you can set it to other values
828export  INSTALL_PATH ?= /boot
829
830#
831# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
832# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
833# an argument if needed. Otherwise it defaults to the kernel install path
834#
835export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
836
837#
838# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
839# relocations required by build roots.  This is not defined in the
840# makefile but the argument can be passed to make if needed.
841#
842
843MODLIB  = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
844export MODLIB
845
846#
847# INSTALL_MOD_STRIP, if defined, will cause modules to be
848# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
849# the default option --strip-debug will be used.  Otherwise,
850# INSTALL_MOD_STRIP value will be used as the options to the strip command.
851
852ifdef INSTALL_MOD_STRIP
853ifeq ($(INSTALL_MOD_STRIP),1)
854mod_strip_cmd = $(STRIP) --strip-debug
855else
856mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
857endif # INSTALL_MOD_STRIP=1
858else
859mod_strip_cmd = true
860endif # INSTALL_MOD_STRIP
861export mod_strip_cmd
862
863# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
864# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
865# or CONFIG_MODULE_COMPRESS_XZ.
866
867mod_compress_cmd = true
868ifdef CONFIG_MODULE_COMPRESS
869  ifdef CONFIG_MODULE_COMPRESS_GZIP
870    mod_compress_cmd = gzip -n
871  endif # CONFIG_MODULE_COMPRESS_GZIP
872  ifdef CONFIG_MODULE_COMPRESS_XZ
873    mod_compress_cmd = xz
874  endif # CONFIG_MODULE_COMPRESS_XZ
875endif # CONFIG_MODULE_COMPRESS
876export mod_compress_cmd
877
878# Select initial ramdisk compression format, default is gzip(1).
879# This shall be used by the dracut(8) tool while creating an initramfs image.
880#
881INITRD_COMPRESS-y                  := gzip
882INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
883INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
884INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
885INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
886INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
887# do not export INITRD_COMPRESS, since we didn't actually
888# choose a sane default compression above.
889# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
890
891ifdef CONFIG_MODULE_SIG_ALL
892MODSECKEY = ./signing_key.priv
893MODPUBKEY = ./signing_key.x509
894export MODPUBKEY
895mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
896else
897mod_sign_cmd = true
898endif
899export mod_sign_cmd
900
901
902ifeq ($(KBUILD_EXTMOD),)
903core-y          += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
904
905vmlinux-dirs    := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
906                     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
907                     $(net-y) $(net-m) $(libs-y) $(libs-m)))
908
909vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
910                     $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
911
912init-y          := $(patsubst %/, %/built-in.o, $(init-y))
913core-y          := $(patsubst %/, %/built-in.o, $(core-y))
914drivers-y       := $(patsubst %/, %/built-in.o, $(drivers-y))
915net-y           := $(patsubst %/, %/built-in.o, $(net-y))
916libs-y1         := $(patsubst %/, %/lib.a, $(libs-y))
917libs-y2         := $(patsubst %/, %/built-in.o, $(libs-y))
918libs-y          := $(libs-y1) $(libs-y2)
919
920# Externally visible symbols (used by link-vmlinux.sh)
921export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
922export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
923export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
924export LDFLAGS_vmlinux
925# used by scripts/pacmage/Makefile
926export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
927
928vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
929
930# Final link of vmlinux
931      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
932quiet_cmd_link-vmlinux = LINK    $@
933
934# Include targets which we want to
935# execute if the rest of the kernel build went well.
936vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
937ifdef CONFIG_HEADERS_CHECK
938        $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
939endif
940ifdef CONFIG_SAMPLES
941        $(Q)$(MAKE) $(build)=samples
942endif
943ifdef CONFIG_BUILD_DOCSRC
944        $(Q)$(MAKE) $(build)=Documentation
945endif
946        +$(call if_changed,link-vmlinux)
947
948# The actual objects are generated when descending,
949# make sure no implicit rule kicks in
950$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
951
952# Handle descending into subdirectories listed in $(vmlinux-dirs)
953# Preset locale variables to speed up the build process. Limit locale
954# tweaks to this spot to avoid wrong language settings when running
955# make menuconfig etc.
956# Error messages still appears in the original language
957
958PHONY += $(vmlinux-dirs)
959$(vmlinux-dirs): prepare scripts
960        $(Q)$(MAKE) $(build)=$@
961
962define filechk_kernel.release
963        echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
964endef
965
966# Store (new) KERNELRELEASE string in include/config/kernel.release
967include/config/kernel.release: include/config/auto.conf FORCE
968        $(call filechk,kernel.release)
969
970
971# Things we need to do before we recursively start building the kernel
972# or the modules are listed in "prepare".
973# A multi level approach is used. prepareN is processed before prepareN-1.
974# archprepare is used in arch Makefiles and when processed asm symlink,
975# version.h and scripts_basic is processed / created.
976
977# Listed in dependency order
978PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
979
980# prepare3 is used to check if we are building in a separate output directory,
981# and if so do:
982# 1) Check that make has not been executed in the kernel src $(srctree)
983prepare3: include/config/kernel.release
984ifneq ($(KBUILD_SRC),)
985        @$(kecho) '  Using $(srctree) as source for kernel'
986        $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
987                echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
988                echo >&2 "  in the '$(srctree)' directory.";\
989                /bin/false; \
990        fi;
991endif
992
993# prepare2 creates a makefile if using a separate output directory
994prepare2: prepare3 outputmakefile asm-generic
995
996prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
997                   include/config/auto.conf
998        $(cmd_crmodverdir)
999
1000archprepare: archheaders archscripts prepare1 scripts_basic
1001
1002prepare0: archprepare FORCE
1003        $(Q)$(MAKE) $(build)=.
1004
1005# All the preparing..
1006prepare: prepare0
1007
1008# Generate some files
1009# ---------------------------------------------------------------------------
1010
1011# KERNELRELEASE can change from a few different places, meaning version.h
1012# needs to be updated, so this check is forced on all builds
1013
1014uts_len := 64
1015define filechk_utsrelease.h
1016        if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1017          echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
1018          exit 1;                                                         \
1019        fi;                                                               \
1020        (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1021endef
1022
1023define filechk_version.h
1024        (echo \#define LINUX_VERSION_CODE $(shell                         \
1025        expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1026        echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1027endef
1028
1029$(version_h): $(srctree)/Makefile FORCE
1030        $(call filechk,version.h)
1031
1032include/generated/utsrelease.h: include/config/kernel.release FORCE
1033        $(call filechk,utsrelease.h)
1034
1035PHONY += headerdep
1036headerdep:
1037        $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1038        $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1039
1040# ---------------------------------------------------------------------------
1041
1042PHONY += depend dep
1043depend dep:
1044        @echo '*** Warning: make $@ is unnecessary now.'
1045
1046# ---------------------------------------------------------------------------
1047# Firmware install
1048INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1049export INSTALL_FW_PATH
1050
1051PHONY += firmware_install
1052firmware_install: FORCE
1053        @mkdir -p $(objtree)/firmware
1054        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1055
1056# ---------------------------------------------------------------------------
1057# Kernel headers
1058
1059#Default location for installed headers
1060export INSTALL_HDR_PATH = $(objtree)/usr
1061
1062hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1063
1064# If we do an all arch process set dst to asm-$(hdr-arch)
1065hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1066
1067PHONY += archheaders
1068archheaders:
1069
1070PHONY += archscripts
1071archscripts:
1072
1073PHONY += __headers
1074__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1075        $(Q)$(MAKE) $(build)=scripts build_unifdef
1076
1077PHONY += headers_install_all
1078headers_install_all:
1079        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1080
1081PHONY += headers_install
1082headers_install: __headers
1083        $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1084          $(error Headers not exportable for the $(SRCARCH) architecture))
1085        $(Q)$(MAKE) $(hdr-inst)=include/uapi
1086        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1087
1088PHONY += headers_check_all
1089headers_check_all: headers_install_all
1090        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1091
1092PHONY += headers_check
1093headers_check: headers_install
1094        $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1095        $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1096
1097# ---------------------------------------------------------------------------
1098# Kernel selftest
1099
1100PHONY += kselftest
1101kselftest:
1102        $(Q)$(MAKE) -C tools/testing/selftests run_tests
1103
1104# ---------------------------------------------------------------------------
1105# Modules
1106
1107ifdef CONFIG_MODULES
1108
1109# By default, build modules as well
1110
1111all: modules
1112
1113# Build modules
1114#
1115# A module can be listed more than once in obj-m resulting in
1116# duplicate lines in modules.order files.  Those are removed
1117# using awk while concatenating to the final file.
1118
1119PHONY += modules
1120modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1121        $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1122        @$(kecho) '  Building modules, stage 2.';
1123        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1124        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1125
1126modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1127        $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1128
1129%/modules.builtin: include/config/auto.conf
1130        $(Q)$(MAKE) $(modbuiltin)=$*
1131
1132
1133# Target to prepare building external modules
1134PHONY += modules_prepare
1135modules_prepare: prepare scripts
1136
1137# Target to install modules
1138PHONY += modules_install
1139modules_install: _modinst_ _modinst_post
1140
1141PHONY += _modinst_
1142_modinst_:
1143        @rm -rf $(MODLIB)/kernel
1144        @rm -f $(MODLIB)/source
1145        @mkdir -p $(MODLIB)/kernel
1146        @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1147        @if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1148                rm -f $(MODLIB)/build ; \
1149                ln -s $(CURDIR) $(MODLIB)/build ; \
1150        fi
1151        @cp -f $(objtree)/modules.order $(MODLIB)/
1152        @cp -f $(objtree)/modules.builtin $(MODLIB)/
1153        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1154
1155# This depmod is only for convenience to give the initial
1156# boot a modules.dep even before / is mounted read-write.  However the
1157# boot script depmod is the master version.
1158PHONY += _modinst_post
1159_modinst_post: _modinst_
1160        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1161        $(call cmd,depmod)
1162
1163ifeq ($(CONFIG_MODULE_SIG), y)
1164PHONY += modules_sign
1165modules_sign:
1166        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1167endif
1168
1169else # CONFIG_MODULES
1170
1171# Modules not configured
1172# ---------------------------------------------------------------------------
1173
1174modules modules_install: FORCE
1175        @echo >&2
1176        @echo >&2 "The present kernel configuration has modules disabled."
1177        @echo >&2 "Type 'make config' and enable loadable module support."
1178        @echo >&2 "Then build a kernel with module support enabled."
1179        @echo >&2
1180        @exit 1
1181
1182endif # CONFIG_MODULES
1183
1184###
1185# Cleaning is done on three levels.
1186# make clean     Delete most generated files
1187#                Leave enough to build external modules
1188# make mrproper  Delete the current configuration, and all generated files
1189# make distclean Remove editor backup files, patch leftover files and the like
1190
1191# Directories & files removed with 'make clean'
1192CLEAN_DIRS  += $(MODVERDIR)
1193
1194# Directories & files removed with 'make mrproper'
1195MRPROPER_DIRS  += include/config usr/include include/generated          \
1196                  arch/*/include/generated .tmp_objdiff
1197MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1198                  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1199                  signing_key.priv signing_key.x509 x509.genkey         \
1200                  extra_certificates signing_key.x509.keyid             \
1201                  signing_key.x509.signer include/linux/version.h
1202
1203# clean - Delete most, but leave enough to build external modules
1204#
1205clean: rm-dirs  := $(CLEAN_DIRS)
1206clean: rm-files := $(CLEAN_FILES)
1207clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1208
1209PHONY += $(clean-dirs) clean archclean vmlinuxclean
1210$(clean-dirs):
1211        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1212
1213vmlinuxclean:
1214        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1215
1216clean: archclean vmlinuxclean
1217
1218# mrproper - Delete all generated files, including .config
1219#
1220mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1221mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1222mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1223
1224PHONY += $(mrproper-dirs) mrproper archmrproper
1225$(mrproper-dirs):
1226        $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1227
1228mrproper: clean archmrproper $(mrproper-dirs)
1229        $(call cmd,rmdirs)
1230        $(call cmd,rmfiles)
1231
1232# distclean
1233#
1234PHONY += distclean
1235
1236distclean: mrproper
1237        @find $(srctree) $(RCS_FIND_IGNORE) \
1238                \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1239                -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1240                -o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1241                -type f -print | xargs rm -f
1242
1243
1244# Packaging of the kernel to various formats
1245# ---------------------------------------------------------------------------
1246# rpm target kept for backward compatibility
1247package-dir     := scripts/package
1248
1249%src-pkg: FORCE
1250        $(Q)$(MAKE) $(build)=$(package-dir) $@
1251%pkg: include/config/kernel.release FORCE
1252        $(Q)$(MAKE) $(build)=$(package-dir) $@
1253rpm: include/config/kernel.release FORCE
1254        $(Q)$(MAKE) $(build)=$(package-dir) $@
1255
1256
1257# Brief documentation of the typical targets used
1258# ---------------------------------------------------------------------------
1259
1260boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1261boards := $(notdir $(boards))
1262board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1263board-dirs := $(sort $(notdir $(board-dirs:/=)))
1264
1265help:
1266        @echo  'Cleaning targets:'
1267        @echo  '  clean           - Remove most generated files but keep the config and'
1268        @echo  '                    enough build support to build external modules'
1269        @echo  '  mrproper        - Remove all generated files + config + various backup files'
1270        @echo  '  distclean       - mrproper + remove editor backup and patch files'
1271        @echo  ''
1272        @echo  'Configuration targets:'
1273        @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1274        @echo  ''
1275        @echo  'Other generic targets:'
1276        @echo  '  all             - Build all targets marked with [*]'
1277        @echo  '* vmlinux         - Build the bare kernel'
1278        @echo  '* modules         - Build all modules'
1279        @echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1280        @echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1281        @echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1282        @echo  '  dir/            - Build all files in dir and below'
1283        @echo  '  dir/file.[oisS] - Build specified target only'
1284        @echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1285        @echo  '                    (requires a recent binutils and recent build (System.map))'
1286        @echo  '  dir/file.ko     - Build module including final link'
1287        @echo  '  modules_prepare - Set up for building external modules'
1288        @echo  '  tags/TAGS       - Generate tags file for editors'
1289        @echo  '  cscope          - Generate cscope index'
1290        @echo  '  gtags           - Generate GNU GLOBAL index'
1291        @echo  '  kernelrelease   - Output the release version string (use with make -s)'
1292        @echo  '  kernelversion   - Output the version stored in Makefile (use with make -s)'
1293        @echo  '  image_name      - Output the image name (use with make -s)'
1294        @echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1295         echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1296         echo  ''
1297        @echo  'Static analysers'
1298        @echo  '  checkstack      - Generate a list of stack hogs'
1299        @echo  '  namespacecheck  - Name space analysis on compiled kernel'
1300        @echo  '  versioncheck    - Sanity check on version.h usage'
1301        @echo  '  includecheck    - Check for duplicate included header files'
1302        @echo  '  export_report   - List the usages of all exported symbols'
1303        @echo  '  headers_check   - Sanity check on exported headers'
1304        @echo  '  headerdep       - Detect inclusion cycles in headers'
1305        @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1306        @echo  ''
1307        @echo  'Kernel selftest'
1308        @echo  '  kselftest       - Build and run kernel selftest (run as root)'
1309        @echo  '                    Build, install, and boot kernel before'
1310        @echo  '                    running kselftest on it'
1311        @echo  ''
1312        @echo  'Kernel packaging:'
1313        @$(MAKE) $(build)=$(package-dir) help
1314        @echo  ''
1315        @echo  'Documentation targets:'
1316        @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1317        @echo  ''
1318        @echo  'Architecture specific targets ($(SRCARCH)):'
1319        @$(if $(archhelp),$(archhelp),\
1320                echo '  No architecture specific help defined for $(SRCARCH)')
1321        @echo  ''
1322        @$(if $(boards), \
1323                $(foreach b, $(boards), \
1324                printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1325                echo '')
1326        @$(if $(board-dirs), \
1327                $(foreach b, $(board-dirs), \
1328                printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1329                printf "  %-16s - Show all of the above\\n" help-boards; \
1330                echo '')
1331
1332        @echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1333        @echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1334        @echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1335        @echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1336        @echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1337        @echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1338        @echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1339        @echo  '                1: warnings which may be relevant and do not occur too often'
1340        @echo  '                2: warnings which occur quite often but may still be relevant'
1341        @echo  '                3: more obscure warnings, can most likely be ignored'
1342        @echo  '                Multiple levels can be combined with W=12 or W=123'
1343        @echo  ''
1344        @echo  'Execute "make" or "make all" to build all targets marked with [*] '
1345        @echo  'For further info see the ./README file'
1346
1347
1348help-board-dirs := $(addprefix help-,$(board-dirs))
1349
1350help-boards: $(help-board-dirs)
1351
1352boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1353
1354$(help-board-dirs): help-%:
1355        @echo  'Architecture specific targets ($(SRCARCH) $*):'
1356        @$(if $(boards-per-dir), \
1357                $(foreach b, $(boards-per-dir), \
1358                printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1359                echo '')
1360
1361
1362# Documentation targets
1363# ---------------------------------------------------------------------------
1364%docs: scripts_basic FORCE
1365        $(Q)$(MAKE) $(build)=scripts build_docproc
1366        $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1367
1368else # KBUILD_EXTMOD
1369
1370###
1371# External module support.
1372# When building external modules the kernel used as basis is considered
1373# read-only, and no consistency checks are made and the make
1374# system is not used on the basis kernel. If updates are required
1375# in the basis kernel ordinary make commands (without M=...) must
1376# be used.
1377#
1378# The following are the only valid targets when building external
1379# modules.
1380# make M=dir clean     Delete all automatically generated files
1381# make M=dir modules   Make all modules in specified dir
1382# make M=dir           Same as 'make M=dir modules'
1383# make M=dir modules_install
1384#                      Install the modules built in the module directory
1385#                      Assumes install directory is already created
1386
1387# We are always building modules
1388KBUILD_MODULES := 1
1389PHONY += crmodverdir
1390crmodverdir:
1391        $(cmd_crmodverdir)
1392
1393PHONY += $(objtree)/Module.symvers
1394$(objtree)/Module.symvers:
1395        @test -e $(objtree)/Module.symvers || ( \
1396        echo; \
1397        echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1398        echo "           is missing; modules will have no dependencies and modversions."; \
1399        echo )
1400
1401module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1402PHONY += $(module-dirs) modules
1403$(module-dirs): crmodverdir $(objtree)/Module.symvers
1404        $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1405
1406modules: $(module-dirs)
1407        @$(kecho) '  Building modules, stage 2.';
1408        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1409
1410PHONY += modules_install
1411modules_install: _emodinst_ _emodinst_post
1412
1413install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1414PHONY += _emodinst_
1415_emodinst_:
1416        $(Q)mkdir -p $(MODLIB)/$(install-dir)
1417        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1418
1419PHONY += _emodinst_post
1420_emodinst_post: _emodinst_
1421        $(call cmd,depmod)
1422
1423clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1424
1425PHONY += $(clean-dirs) clean
1426$(clean-dirs):
1427        $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1428
1429clean:  rm-dirs := $(MODVERDIR)
1430clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1431
1432help:
1433        @echo  '  Building external modules.'
1434        @echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1435        @echo  ''
1436        @echo  '  modules         - default target, build the module(s)'
1437        @echo  '  modules_install - install the module'
1438        @echo  '  clean           - remove generated files in module directory only'
1439        @echo  ''
1440
1441# Dummies...
1442PHONY += prepare scripts
1443prepare: ;
1444scripts: ;
1445endif # KBUILD_EXTMOD
1446
1447clean: $(clean-dirs)
1448        $(call cmd,rmdirs)
1449        $(call cmd,rmfiles)
1450        @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1451                \( -name '*.[oa]' -o -name '*.ko' -o -name '.*.cmd' \
1452                -o -name '*.ko.*' \
1453                -o -name '*.dwo'  \
1454                -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1455                -o -name '*.symtypes' -o -name 'modules.order' \
1456                -o -name modules.builtin -o -name '.tmp_*.o.*' \
1457                -o -name '*.gcno' \) -type f -print | xargs rm -f
1458
1459# Generate tags for editors
1460# ---------------------------------------------------------------------------
1461quiet_cmd_tags = GEN     $@
1462      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1463
1464tags TAGS cscope gtags: FORCE
1465        $(call cmd,tags)
1466
1467# Scripts to check various things for consistency
1468# ---------------------------------------------------------------------------
1469
1470PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1471
1472includecheck:
1473        find $(srctree)/* $(RCS_FIND_IGNORE) \
1474                -name '*.[hcS]' -type f -print | sort \
1475                | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1476
1477versioncheck:
1478        find $(srctree)/* $(RCS_FIND_IGNORE) \
1479                -name '*.[hcS]' -type f -print | sort \
1480                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1481
1482coccicheck:
1483        $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1484
1485namespacecheck:
1486        $(PERL) $(srctree)/scripts/namespace.pl
1487
1488export_report:
1489        $(PERL) $(srctree)/scripts/export_report.pl
1490
1491endif #ifeq ($(config-targets),1)
1492endif #ifeq ($(mixed-targets),1)
1493
1494PHONY += checkstack kernelrelease kernelversion image_name
1495
1496# UML needs a little special treatment here.  It wants to use the host
1497# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1498# else wants $(ARCH), including people doing cross-builds, which means
1499# that $(SUBARCH) doesn't work here.
1500ifeq ($(ARCH), um)
1501CHECKSTACK_ARCH := $(SUBARCH)
1502else
1503CHECKSTACK_ARCH := $(ARCH)
1504endif
1505checkstack:
1506        $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1507        $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1508
1509kernelrelease:
1510        @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1511
1512kernelversion:
1513        @echo $(KERNELVERSION)
1514
1515image_name:
1516        @echo $(KBUILD_IMAGE)
1517
1518# Clear a bunch of variables before executing the submake
1519tools/: FORCE
1520        $(Q)mkdir -p $(objtree)/tools
1521        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1522
1523tools/%: FORCE
1524        $(Q)mkdir -p $(objtree)/tools
1525        $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1526
1527# Single targets
1528# ---------------------------------------------------------------------------
1529# Single targets are compatible with:
1530# - build with mixed source and output
1531# - build with separate output dir 'make O=...'
1532# - external modules
1533#
1534#  target-dir => where to store outputfile
1535#  build-dir  => directory in kernel source tree to use
1536
1537ifeq ($(KBUILD_EXTMOD),)
1538        build-dir  = $(patsubst %/,%,$(dir $@))
1539        target-dir = $(dir $@)
1540else
1541        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1542        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1543        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1544endif
1545
1546%.s: %.c prepare scripts FORCE
1547        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1548%.i: %.c prepare scripts FORCE
1549        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1550%.o: %.c prepare scripts FORCE
1551        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1552%.lst: %.c prepare scripts FORCE
1553        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1554%.s: %.S prepare scripts FORCE
1555        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1556%.o: %.S prepare scripts FORCE
1557        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1558%.symtypes: %.c prepare scripts FORCE
1559        $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1560
1561# Modules
1562/: prepare scripts FORCE
1563        $(cmd_crmodverdir)
1564        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1565        $(build)=$(build-dir)
1566# Make sure the latest headers are built for Documentation
1567Documentation/: headers_install
1568%/: prepare scripts FORCE
1569        $(cmd_crmodverdir)
1570        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1571        $(build)=$(build-dir)
1572%.ko: prepare scripts FORCE
1573        $(cmd_crmodverdir)
1574        $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1575        $(build)=$(build-dir) $(@:.ko=.o)
1576        $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1577
1578# FIXME Should go into a make.lib or something
1579# ===========================================================================
1580
1581quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1582      cmd_rmdirs = rm -rf $(rm-dirs)
1583
1584quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1585      cmd_rmfiles = rm -f $(rm-files)
1586
1587# Run depmod only if we have System.map and depmod is executable
1588quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1589      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1590                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1591
1592# Create temporary dir for module support files
1593# clean it up only when building all modules
1594cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1595                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1596
1597# read all saved command lines
1598
1599targets := $(wildcard $(sort $(targets)))
1600cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1601
1602ifneq ($(cmd_files),)
1603  $(cmd_files): ;       # Do not try to update included dependency files
1604  include $(cmd_files)
1605endif
1606
1607# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1608# Usage:
1609# $(Q)$(MAKE) $(clean)=dir
1610clean := -f $(srctree)/scripts/Makefile.clean obj
1611
1612endif   # skip-makefile
1613
1614PHONY += FORCE
1615FORCE:
1616
1617# Declare the contents of the .PHONY variable as phony.  We keep that
1618# information in a variable so we can use it in if_changed and friends.
1619.PHONY: $(PHONY)
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