Root/Makefile

Source at commit fbf123cd4cc0c097fe9a99c90109ebb2a5e94a50 created 7 years 10 months ago.
By Lars-Peter Clausen, dma: jz4740: Dequeue descriptor from active list before completing it
1VERSION = 3
2PATCHLEVEL = 16
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Shuffling Zombie Juror
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
28# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
44# Beautify output
45# ---------------------------------------------------------------------------
46#
47# Normally, we echo the whole command before executing it. By making
48# that echo $($(quiet)$(cmd)), we now have the possibility to set
49# $(quiet) to choose other forms of output instead, e.g.
50#
51# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
52# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
53#
54# If $(quiet) is empty, the whole command will be printed.
55# If it is set to "quiet_", only the short version will be printed.
56# If it is set to "silent_", nothing will be printed at all, since
57# the variable $(silent_cmd_cc_o_c) doesn't exist.
58#
59# A simple variant is to prefix commands with $(Q) - that's useful
60# for commands that shall be hidden in non-verbose mode.
61#
62# $(Q)ln $@ :<
63#
64# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
65# If KBUILD_VERBOSE equals 1 then the above command is displayed.
66#
67# To put more focus on warnings, be less verbose as default
68# Use 'make V=1' to see the full commands
69
70ifeq ("$(origin V)", "command line")
71  KBUILD_VERBOSE = $(V)
72endif
73ifndef KBUILD_VERBOSE
74  KBUILD_VERBOSE = 0
75endif
76
77ifeq ($(KBUILD_VERBOSE),1)
78  quiet =
79  Q =
80else
81  quiet=quiet_
82  Q = @
83endif
84
85# If the user is running make -s (silent mode), suppress echoing of
86# commands
87
88ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
89ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
90  quiet=silent_
91endif
92else # make-3.8x
93ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
94  quiet=silent_
95endif
96endif
97
98export quiet Q KBUILD_VERBOSE
99
100# Call a source code checker (by default, "sparse") as part of the
101# C compilation.
102#
103# Use 'make C=1' to enable checking of only re-compiled files.
104# Use 'make C=2' to enable checking of *all* source files, regardless
105# of whether they are re-compiled or not.
106#
107# See the file "Documentation/sparse.txt" for more details, including
108# where to get the "sparse" utility.
109
110ifeq ("$(origin C)", "command line")
111  KBUILD_CHECKSRC = $(C)
112endif
113ifndef KBUILD_CHECKSRC
114  KBUILD_CHECKSRC = 0
115endif
116
117# Use make M=dir to specify directory of external module to build
118# Old syntax make ... SUBDIRS=$PWD is still supported
119# Setting the environment variable KBUILD_EXTMOD take precedence
120ifdef SUBDIRS
121  KBUILD_EXTMOD ?= $(SUBDIRS)
122endif
123
124ifeq ("$(origin M)", "command line")
125  KBUILD_EXTMOD := $(M)
126endif
127
128# kbuild supports saving output files in a separate directory.
129# To locate output files in a separate directory two syntaxes are supported.
130# In both cases the working directory must be the root of the kernel src.
131# 1) O=
132# Use "make O=dir/to/store/output/files/"
133#
134# 2) Set KBUILD_OUTPUT
135# Set the environment variable KBUILD_OUTPUT to point to the directory
136# where the output files shall be placed.
137# export KBUILD_OUTPUT=dir/to/store/output/files/
138# make
139#
140# The O= assignment takes precedence over the KBUILD_OUTPUT environment
141# variable.
142
143
144# KBUILD_SRC is set on invocation of make in OBJ directory
145# KBUILD_SRC is not intended to be used by the regular user (for now)
146ifeq ($(KBUILD_SRC),)
147
148# OK, Make called in directory where kernel src resides
149# Do we want to locate output files in a separate directory?
150ifeq ("$(origin O)", "command line")
151  KBUILD_OUTPUT := $(O)
152endif
153
154# That's our default target when none is given on the command line
155PHONY := _all
156_all:
157
158# Cancel implicit rules on top Makefile
159$(CURDIR)/Makefile Makefile: ;
160
161ifneq ($(KBUILD_OUTPUT),)
162# Invoke a second make in the output directory, passing relevant variables
163# check that the output directory actually exists
164saved-output := $(KBUILD_OUTPUT)
165KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
166                                && /bin/pwd)
167$(if $(KBUILD_OUTPUT),, \
168     $(error failed to create output directory "$(saved-output)"))
169
170PHONY += $(MAKECMDGOALS) sub-make
171
172$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
173    @:
174
175# Fake the "Entering directory" message once, so that IDEs/editors are
176# able to understand relative filenames.
177       echodir := @echo
178 quiet_echodir := @echo
179silent_echodir := @:
180sub-make: FORCE
181    $($(quiet)echodir) "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
182    $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
183    KBUILD_SRC=$(CURDIR) \
184    KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
185    $(filter-out _all sub-make,$(MAKECMDGOALS))
186
187# Leave processing to above invocation of make
188skip-makefile := 1
189endif # ifneq ($(KBUILD_OUTPUT),)
190endif # ifeq ($(KBUILD_SRC),)
191
192# We process the rest of the Makefile if this is the final invocation of make
193ifeq ($(skip-makefile),)
194
195# If building an external module we do not care about the all: rule
196# but instead _all depend on modules
197PHONY += all
198ifeq ($(KBUILD_EXTMOD),)
199_all: all
200else
201_all: modules
202endif
203
204ifeq ($(KBUILD_SRC),)
205        # building in the source tree
206        srctree := .
207else
208        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
209                # building in a subdirectory of the source tree
210                srctree := ..
211        else
212                srctree := $(KBUILD_SRC)
213        endif
214endif
215objtree := .
216src := $(srctree)
217obj := $(objtree)
218
219VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
220
221export srctree objtree VPATH
222
223
224# SUBARCH tells the usermode build what the underlying arch is. That is set
225# first, and if a usermode build is happening, the "ARCH=um" on the command
226# line overrides the setting of ARCH below. If a native build is happening,
227# then ARCH is assigned, getting whatever value it gets normally, and
228# SUBARCH is subsequently ignored.
229
230SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
231                  -e s/sun4u/sparc64/ \
232                  -e s/arm.*/arm/ -e s/sa110/arm/ \
233                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
234                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
235                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
236
237# Cross compiling and selecting different set of gcc/bin-utils
238# ---------------------------------------------------------------------------
239#
240# When performing cross compilation for other architectures ARCH shall be set
241# to the target architecture. (See arch/* for the possibilities).
242# ARCH can be set during invocation of make:
243# make ARCH=ia64
244# Another way is to have ARCH set in the environment.
245# The default ARCH is the host where make is executed.
246
247# CROSS_COMPILE specify the prefix used for all executables used
248# during compilation. Only gcc and related bin-utils executables
249# are prefixed with $(CROSS_COMPILE).
250# CROSS_COMPILE can be set on the command line
251# make CROSS_COMPILE=ia64-linux-
252# Alternatively CROSS_COMPILE can be set in the environment.
253# A third alternative is to store a setting in .config so that plain
254# "make" in the configured kernel build directory always uses that.
255# Default value for CROSS_COMPILE is not to prefix executables
256# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
257ARCH ?= $(SUBARCH)
258CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
259
260# Architecture as present in compile.h
261UTS_MACHINE := $(ARCH)
262SRCARCH := $(ARCH)
263
264# Additional ARCH settings for x86
265ifeq ($(ARCH),i386)
266        SRCARCH := x86
267endif
268ifeq ($(ARCH),x86_64)
269        SRCARCH := x86
270endif
271
272# Additional ARCH settings for sparc
273ifeq ($(ARCH),sparc32)
274       SRCARCH := sparc
275endif
276ifeq ($(ARCH),sparc64)
277       SRCARCH := sparc
278endif
279
280# Additional ARCH settings for sh
281ifeq ($(ARCH),sh64)
282       SRCARCH := sh
283endif
284
285# Additional ARCH settings for tile
286ifeq ($(ARCH),tilepro)
287       SRCARCH := tile
288endif
289ifeq ($(ARCH),tilegx)
290       SRCARCH := tile
291endif
292
293# Where to locate arch specific headers
294hdr-arch := $(SRCARCH)
295
296KCONFIG_CONFIG ?= .config
297export KCONFIG_CONFIG
298
299# SHELL used by kbuild
300CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
301      else if [ -x /bin/bash ]; then echo /bin/bash; \
302      else echo sh; fi ; fi)
303
304HOSTCC = gcc
305HOSTCXX = g++
306HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
307HOSTCXXFLAGS = -O2
308
309ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
310HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
311        -Wno-missing-field-initializers -fno-delete-null-pointer-checks
312endif
313
314# Decide whether to build built-in, modular, or both.
315# Normally, just do built-in.
316
317KBUILD_MODULES :=
318KBUILD_BUILTIN := 1
319
320# If we have only "make modules", don't compile built-in objects.
321# When we're building modules with modversions, we need to consider
322# the built-in objects during the descend as well, in order to
323# make sure the checksums are up to date before we record them.
324
325ifeq ($(MAKECMDGOALS),modules)
326  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
327endif
328
329# If we have "make <whatever> modules", compile modules
330# in addition to whatever we do anyway.
331# Just "make" or "make all" shall build modules as well
332
333ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
334  KBUILD_MODULES := 1
335endif
336
337ifeq ($(MAKECMDGOALS),)
338  KBUILD_MODULES := 1
339endif
340
341export KBUILD_MODULES KBUILD_BUILTIN
342export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
343
344ifneq ($(CC),)
345ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
346COMPILER := clang
347else
348COMPILER := gcc
349endif
350export COMPILER
351endif
352
353# Look for make include files relative to root of kernel src
354MAKEFLAGS += --include-dir=$(srctree)
355
356# We need some generic definitions (do not try to remake the file).
357$(srctree)/scripts/Kbuild.include: ;
358include $(srctree)/scripts/Kbuild.include
359
360# Make variables (CC, etc...)
361AS = $(CROSS_COMPILE)as
362LD = $(CROSS_COMPILE)ld
363CC = $(CROSS_COMPILE)gcc
364CPP = $(CC) -E
365AR = $(CROSS_COMPILE)ar
366NM = $(CROSS_COMPILE)nm
367STRIP = $(CROSS_COMPILE)strip
368OBJCOPY = $(CROSS_COMPILE)objcopy
369OBJDUMP = $(CROSS_COMPILE)objdump
370AWK = awk
371GENKSYMS = scripts/genksyms/genksyms
372INSTALLKERNEL := installkernel
373DEPMOD = /sbin/depmod
374PERL = perl
375CHECK = sparse
376
377CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
378          -Wbitwise -Wno-return-void $(CF)
379CFLAGS_MODULE =
380AFLAGS_MODULE =
381LDFLAGS_MODULE =
382CFLAGS_KERNEL =
383AFLAGS_KERNEL =
384CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
385
386
387# Use USERINCLUDE when you must reference the UAPI directories only.
388USERINCLUDE := \
389        -I$(srctree)/arch/$(hdr-arch)/include/uapi \
390        -Iarch/$(hdr-arch)/include/generated/uapi \
391        -I$(srctree)/include/uapi \
392        -Iinclude/generated/uapi \
393                -include $(srctree)/include/linux/kconfig.h
394
395# Use LINUXINCLUDE when you must reference the include/ directory.
396# Needed to be compatible with the O= option
397LINUXINCLUDE := \
398        -I$(srctree)/arch/$(hdr-arch)/include \
399        -Iarch/$(hdr-arch)/include/generated \
400        $(if $(KBUILD_SRC), -I$(srctree)/include) \
401        -Iinclude \
402        $(USERINCLUDE)
403
404KBUILD_CPPFLAGS := -D__KERNEL__
405
406KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
407           -fno-strict-aliasing -fno-common \
408           -Werror-implicit-function-declaration \
409           -Wno-format-security
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
417
418# Read KERNELRELEASE from include/config/kernel.release (if it exists)
419KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
420KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
421
422export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
423export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
424export CPP AR NM STRIP OBJCOPY OBJDUMP
425export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
426export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
427
428export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
429export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
430export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
431export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
432export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
433export KBUILD_ARFLAGS
434
435# When compiling out-of-tree modules, put MODVERDIR in the module
436# tree rather than in the kernel tree. The kernel tree might
437# even be read-only.
438export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
439
440# Files to ignore in find ... statements
441
442export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
443              -name CVS -o -name .pc -o -name .hg -o -name .git \) \
444              -prune -o
445export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
446             --exclude CVS --exclude .pc --exclude .hg --exclude .git
447
448# ===========================================================================
449# Rules shared between *config targets and build targets
450
451# Basic helpers built in scripts/
452PHONY += scripts_basic
453scripts_basic:
454    $(Q)$(MAKE) $(build)=scripts/basic
455    $(Q)rm -f .tmp_quiet_recordmcount
456
457# To avoid any implicit rule to kick in, define an empty command.
458scripts/basic/%: scripts_basic ;
459
460PHONY += outputmakefile
461# outputmakefile generates a Makefile in the output directory, if using a
462# separate output directory. This allows convenient use of make in the
463# output directory.
464outputmakefile:
465ifneq ($(KBUILD_SRC),)
466    $(Q)ln -fsn $(srctree) source
467    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
468        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
469endif
470
471# Support for using generic headers in asm-generic
472PHONY += asm-generic
473asm-generic:
474    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
475                src=asm obj=arch/$(SRCARCH)/include/generated/asm
476    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
477                src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
478
479# To make sure we do not include .config for any of the *config targets
480# catch them early, and hand them over to scripts/kconfig/Makefile
481# It is allowed to specify more targets when calling make, including
482# mixing *config targets and build targets.
483# For example 'make oldconfig all'.
484# Detect when mixed targets is specified, and make a second invocation
485# of make so .config is not included in this case either (for *config).
486
487version_h := include/generated/uapi/linux/version.h
488
489no-dot-config-targets := clean mrproper distclean \
490             cscope gtags TAGS tags help %docs check% coccicheck \
491             $(version_h) headers_% archheaders archscripts \
492             kernelversion %src-pkg
493
494config-targets := 0
495mixed-targets := 0
496dot-config := 1
497
498ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
499    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
500        dot-config := 0
501    endif
502endif
503
504ifeq ($(KBUILD_EXTMOD),)
505        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
506                config-targets := 1
507                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
508                        mixed-targets := 1
509                endif
510        endif
511endif
512
513ifeq ($(mixed-targets),1)
514# ===========================================================================
515# We're called with mixed targets (*config and build targets).
516# Handle them one by one.
517
518PHONY += $(MAKECMDGOALS) __build_one_by_one
519
520$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
521    @:
522
523__build_one_by_one:
524    $(Q)set -e; \
525    for i in $(MAKECMDGOALS); do \
526        $(MAKE) -f $(srctree)/Makefile $$i; \
527    done
528
529else
530ifeq ($(config-targets),1)
531# ===========================================================================
532# *config targets only - make sure prerequisites are updated, and descend
533# in scripts/kconfig to make the *config target
534
535# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
536# KBUILD_DEFCONFIG may point out an alternative default configuration
537# used for 'make defconfig'
538include $(srctree)/arch/$(SRCARCH)/Makefile
539export KBUILD_DEFCONFIG KBUILD_KCONFIG
540
541config: scripts_basic outputmakefile FORCE
542    $(Q)$(MAKE) $(build)=scripts/kconfig $@
543
544%config: scripts_basic outputmakefile FORCE
545    $(Q)$(MAKE) $(build)=scripts/kconfig $@
546
547else
548# ===========================================================================
549# Build targets only - this includes vmlinux, arch specific targets, clean
550# targets and others. In general all targets except *config targets.
551
552ifeq ($(KBUILD_EXTMOD),)
553# Additional helpers built in scripts/
554# Carefully list dependencies so we do not try to build scripts twice
555# in parallel
556PHONY += scripts
557scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
558     asm-generic
559    $(Q)$(MAKE) $(build)=$(@)
560
561# Objects we will link into vmlinux / subdirs we need to visit
562init-y := init/
563drivers-y := drivers/ sound/ firmware/
564net-y := net/
565libs-y := lib/
566core-y := usr/
567endif # KBUILD_EXTMOD
568
569ifeq ($(dot-config),1)
570# Read in config
571-include include/config/auto.conf
572
573ifeq ($(KBUILD_EXTMOD),)
574# Read in dependencies to all Kconfig* files, make sure to run
575# oldconfig if changes are detected.
576-include include/config/auto.conf.cmd
577
578# To avoid any implicit rule to kick in, define an empty command
579$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
580
581# If .config is newer than include/config/auto.conf, someone tinkered
582# with it and forgot to run make oldconfig.
583# if auto.conf.cmd is missing then we are probably in a cleaned tree so
584# we execute the config step to be sure to catch updated Kconfig files
585include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
586    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
587else
588# external modules needs include/generated/autoconf.h and include/config/auto.conf
589# but do not care if they are up-to-date. Use auto.conf to trigger the test
590PHONY += include/config/auto.conf
591
592include/config/auto.conf:
593    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
594    echo >&2; \
595    echo >&2 " ERROR: Kernel configuration is invalid."; \
596    echo >&2 " include/generated/autoconf.h or $@ are missing.";\
597    echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
598    echo >&2 ; \
599    /bin/false)
600
601endif # KBUILD_EXTMOD
602
603else
604# Dummy target needed, because used as prerequisite
605include/config/auto.conf: ;
606endif # $(dot-config)
607
608# The all: target is the default when no target is given on the
609# command line.
610# This allow a user to issue only 'make' to build a kernel including modules
611# Defaults to vmlinux, but the arch makefile usually adds further targets
612all: vmlinux
613
614include $(srctree)/arch/$(SRCARCH)/Makefile
615
616KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
617
618ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
619KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
620else
621KBUILD_CFLAGS += -O2
622endif
623
624ifdef CONFIG_READABLE_ASM
625# Disable optimizations that make assembler listings hard to read.
626# reorder blocks reorders the control in the function
627# ipa clone creates specialized cloned functions
628# partial inlining inlines only parts of functions
629KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
630                 $(call cc-option,-fno-ipa-cp-clone,) \
631                 $(call cc-option,-fno-partial-inlining)
632endif
633
634ifneq ($(CONFIG_FRAME_WARN),0)
635KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
636endif
637
638# Handle stack protector mode.
639ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
640  stackp-flag := -fstack-protector
641  ifeq ($(call cc-option, $(stackp-flag)),)
642    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
643             -fstack-protector not supported by compiler)
644  endif
645else
646ifdef CONFIG_CC_STACKPROTECTOR_STRONG
647  stackp-flag := -fstack-protector-strong
648  ifeq ($(call cc-option, $(stackp-flag)),)
649    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
650          -fstack-protector-strong not supported by compiler)
651  endif
652else
653  # Force off for distro compilers that enable stack protector by default.
654  stackp-flag := $(call cc-option, -fno-stack-protector)
655endif
656endif
657KBUILD_CFLAGS += $(stackp-flag)
658
659ifeq ($(COMPILER),clang)
660KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
661KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
662KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
663KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
664KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
665# Quiet clang warning: comparison of unsigned expression < 0 is always false
666KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
667# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
668# source of a reference will be _MergedGlobals and not on of the whitelisted names.
669# See modpost pattern 2
670KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
671else
672
673# This warning generated too much noise in a regular build.
674# Use make W=1 to enable this warning (see scripts/Makefile.build)
675KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
676endif
677
678ifdef CONFIG_FRAME_POINTER
679KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
680else
681# Some targets (ARM with Thumb2, for example), can't be built with frame
682# pointers. For those, we don't have FUNCTION_TRACER automatically
683# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
684# incompatible with -fomit-frame-pointer with current GCC, so we don't use
685# -fomit-frame-pointer with FUNCTION_TRACER.
686ifndef CONFIG_FUNCTION_TRACER
687KBUILD_CFLAGS += -fomit-frame-pointer
688endif
689endif
690
691KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
692
693ifdef CONFIG_DEBUG_INFO
694KBUILD_CFLAGS += -g
695KBUILD_AFLAGS += -Wa,-gdwarf-2
696endif
697
698ifdef CONFIG_DEBUG_INFO_REDUCED
699KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
700           $(call cc-option,-fno-var-tracking)
701endif
702
703ifdef CONFIG_FUNCTION_TRACER
704ifdef CONFIG_HAVE_FENTRY
705CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
706endif
707KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
708KBUILD_AFLAGS += $(CC_USING_FENTRY)
709ifdef CONFIG_DYNAMIC_FTRACE
710    ifdef CONFIG_HAVE_C_RECORDMCOUNT
711        BUILD_C_RECORDMCOUNT := y
712        export BUILD_C_RECORDMCOUNT
713    endif
714endif
715endif
716
717# We trigger additional mismatches with less inlining
718ifdef CONFIG_DEBUG_SECTION_MISMATCH
719KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
720endif
721
722# arch Makefile may override CC so keep this after arch Makefile is included
723NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
724CHECKFLAGS += $(NOSTDINC_FLAGS)
725
726# warn about C99 declaration after statement
727KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
728
729# disable pointer signed / unsigned warnings in gcc 4.0
730KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
731
732# disable invalid "can't wrap" optimizations for signed / pointers
733KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
734
735# conserve stack if available
736KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
737
738# disallow errors like 'EXPORT_GPL(foo);' with missing header
739KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
740
741# require functions to have arguments in prototypes, not empty 'int foo()'
742KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
743
744# Prohibit date/time macros, which would make the build non-deterministic
745KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
746
747# use the deterministic mode of AR if available
748KBUILD_ARFLAGS := $(call ar-option,D)
749
750# check for 'asm goto'
751ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
752    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
753endif
754
755include $(srctree)/scripts/Makefile.extrawarn
756
757# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
758KBUILD_CPPFLAGS += $(KCPPFLAGS)
759KBUILD_AFLAGS += $(KAFLAGS)
760KBUILD_CFLAGS += $(KCFLAGS)
761
762# Use --build-id when available.
763LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
764                  $(call cc-ldoption, -Wl$(comma)--build-id,))
765KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
766LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
767
768ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
769LDFLAGS_vmlinux += $(call ld-option, -X,)
770endif
771
772# Default kernel image to build when no specific target is given.
773# KBUILD_IMAGE may be overruled on the command line or
774# set in the environment
775# Also any assignments in arch/$(ARCH)/Makefile take precedence over
776# this default value
777export KBUILD_IMAGE ?= vmlinux
778
779#
780# INSTALL_PATH specifies where to place the updated kernel and system map
781# images. Default is /boot, but you can set it to other values
782export INSTALL_PATH ?= /boot
783
784#
785# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
786# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
787# an argument if needed. Otherwise it defaults to the kernel install path
788#
789export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
790
791#
792# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
793# relocations required by build roots. This is not defined in the
794# makefile but the argument can be passed to make if needed.
795#
796
797MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
798export MODLIB
799
800#
801# INSTALL_MOD_STRIP, if defined, will cause modules to be
802# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
803# the default option --strip-debug will be used. Otherwise,
804# INSTALL_MOD_STRIP value will be used as the options to the strip command.
805
806ifdef INSTALL_MOD_STRIP
807ifeq ($(INSTALL_MOD_STRIP),1)
808mod_strip_cmd = $(STRIP) --strip-debug
809else
810mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
811endif # INSTALL_MOD_STRIP=1
812else
813mod_strip_cmd = true
814endif # INSTALL_MOD_STRIP
815export mod_strip_cmd
816
817# Select initial ramdisk compression format, default is gzip(1).
818# This shall be used by the dracut(8) tool while creating an initramfs image.
819#
820INITRD_COMPRESS-y := gzip
821INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
822INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
823INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
824INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
825INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
826# do not export INITRD_COMPRESS, since we didn't actually
827# choose a sane default compression above.
828# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
829
830ifdef CONFIG_MODULE_SIG_ALL
831MODSECKEY = ./signing_key.priv
832MODPUBKEY = ./signing_key.x509
833export MODPUBKEY
834mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
835else
836mod_sign_cmd = true
837endif
838export mod_sign_cmd
839
840
841ifeq ($(KBUILD_EXTMOD),)
842core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
843
844vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
845             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
846             $(net-y) $(net-m) $(libs-y) $(libs-m)))
847
848vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
849             $(init-n) $(init-) \
850             $(core-n) $(core-) $(drivers-n) $(drivers-) \
851             $(net-n) $(net-) $(libs-n) $(libs-))))
852
853init-y := $(patsubst %/, %/built-in.o, $(init-y))
854core-y := $(patsubst %/, %/built-in.o, $(core-y))
855drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
856net-y := $(patsubst %/, %/built-in.o, $(net-y))
857libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
858libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
859libs-y := $(libs-y1) $(libs-y2)
860
861# Externally visible symbols (used by link-vmlinux.sh)
862export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
863export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
864export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
865export LDFLAGS_vmlinux
866# used by scripts/pacmage/Makefile
867export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
868
869vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
870
871# Final link of vmlinux
872      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
873quiet_cmd_link-vmlinux = LINK $@
874
875# Include targets which we want to
876# execute if the rest of the kernel build went well.
877vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
878ifdef CONFIG_HEADERS_CHECK
879    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
880endif
881ifdef CONFIG_SAMPLES
882    $(Q)$(MAKE) $(build)=samples
883endif
884ifdef CONFIG_BUILD_DOCSRC
885    $(Q)$(MAKE) $(build)=Documentation
886endif
887    +$(call if_changed,link-vmlinux)
888
889# The actual objects are generated when descending,
890# make sure no implicit rule kicks in
891$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
892
893# Handle descending into subdirectories listed in $(vmlinux-dirs)
894# Preset locale variables to speed up the build process. Limit locale
895# tweaks to this spot to avoid wrong language settings when running
896# make menuconfig etc.
897# Error messages still appears in the original language
898
899PHONY += $(vmlinux-dirs)
900$(vmlinux-dirs): prepare scripts
901    $(Q)$(MAKE) $(build)=$@
902
903define filechk_kernel.release
904    echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
905endef
906
907# Store (new) KERNELRELEASE string in include/config/kernel.release
908include/config/kernel.release: include/config/auto.conf FORCE
909    $(call filechk,kernel.release)
910
911
912# Things we need to do before we recursively start building the kernel
913# or the modules are listed in "prepare".
914# A multi level approach is used. prepareN is processed before prepareN-1.
915# archprepare is used in arch Makefiles and when processed asm symlink,
916# version.h and scripts_basic is processed / created.
917
918# Listed in dependency order
919PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
920
921# prepare3 is used to check if we are building in a separate output directory,
922# and if so do:
923# 1) Check that make has not been executed in the kernel src $(srctree)
924prepare3: include/config/kernel.release
925ifneq ($(KBUILD_SRC),)
926    @$(kecho) ' Using $(srctree) as source for kernel'
927    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
928        echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
929        echo >&2 " in the '$(srctree)' directory.";\
930        /bin/false; \
931    fi;
932endif
933
934# prepare2 creates a makefile if using a separate output directory
935prepare2: prepare3 outputmakefile asm-generic
936
937prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
938                   include/config/auto.conf
939    $(cmd_crmodverdir)
940
941archprepare: archheaders archscripts prepare1 scripts_basic
942
943prepare0: archprepare FORCE
944    $(Q)$(MAKE) $(build)=.
945
946# All the preparing..
947prepare: prepare0
948
949# Generate some files
950# ---------------------------------------------------------------------------
951
952# KERNELRELEASE can change from a few different places, meaning version.h
953# needs to be updated, so this check is forced on all builds
954
955uts_len := 64
956define filechk_utsrelease.h
957    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
958      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
959      exit 1; \
960    fi; \
961    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
962endef
963
964define filechk_version.h
965    (echo \#define LINUX_VERSION_CODE $(shell \
966    expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
967    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
968endef
969
970$(version_h): $(srctree)/Makefile FORCE
971    $(call filechk,version.h)
972
973include/generated/utsrelease.h: include/config/kernel.release FORCE
974    $(call filechk,utsrelease.h)
975
976PHONY += headerdep
977headerdep:
978    $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
979    $(srctree)/scripts/headerdep.pl -I$(srctree)/include
980
981# ---------------------------------------------------------------------------
982
983PHONY += depend dep
984depend dep:
985    @echo '*** Warning: make $@ is unnecessary now.'
986
987# ---------------------------------------------------------------------------
988# Firmware install
989INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
990export INSTALL_FW_PATH
991
992PHONY += firmware_install
993firmware_install: FORCE
994    @mkdir -p $(objtree)/firmware
995    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
996
997# ---------------------------------------------------------------------------
998# Kernel headers
999
1000#Default location for installed headers
1001export INSTALL_HDR_PATH = $(objtree)/usr
1002
1003hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1004
1005# If we do an all arch process set dst to asm-$(hdr-arch)
1006hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1007
1008PHONY += archheaders
1009archheaders:
1010
1011PHONY += archscripts
1012archscripts:
1013
1014PHONY += __headers
1015__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1016    $(Q)$(MAKE) $(build)=scripts build_unifdef
1017
1018PHONY += headers_install_all
1019headers_install_all:
1020    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1021
1022PHONY += headers_install
1023headers_install: __headers
1024    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1025      $(error Headers not exportable for the $(SRCARCH) architecture))
1026    $(Q)$(MAKE) $(hdr-inst)=include/uapi
1027    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1028
1029PHONY += headers_check_all
1030headers_check_all: headers_install_all
1031    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1032
1033PHONY += headers_check
1034headers_check: headers_install
1035    $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1036    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1037
1038# ---------------------------------------------------------------------------
1039# Modules
1040
1041ifdef CONFIG_MODULES
1042
1043# By default, build modules as well
1044
1045all: modules
1046
1047# Build modules
1048#
1049# A module can be listed more than once in obj-m resulting in
1050# duplicate lines in modules.order files. Those are removed
1051# using awk while concatenating to the final file.
1052
1053PHONY += modules
1054modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1055    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1056    @$(kecho) ' Building modules, stage 2.';
1057    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1058    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1059
1060modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1061    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1062
1063%/modules.builtin: include/config/auto.conf
1064    $(Q)$(MAKE) $(modbuiltin)=$*
1065
1066
1067# Target to prepare building external modules
1068PHONY += modules_prepare
1069modules_prepare: prepare scripts
1070
1071# Target to install modules
1072PHONY += modules_install
1073modules_install: _modinst_ _modinst_post
1074
1075PHONY += _modinst_
1076_modinst_:
1077    @rm -rf $(MODLIB)/kernel
1078    @rm -f $(MODLIB)/source
1079    @mkdir -p $(MODLIB)/kernel
1080    @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1081    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1082        rm -f $(MODLIB)/build ; \
1083        ln -s $(CURDIR) $(MODLIB)/build ; \
1084    fi
1085    @cp -f $(objtree)/modules.order $(MODLIB)/
1086    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1087    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1088
1089# This depmod is only for convenience to give the initial
1090# boot a modules.dep even before / is mounted read-write. However the
1091# boot script depmod is the master version.
1092PHONY += _modinst_post
1093_modinst_post: _modinst_
1094    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1095    $(call cmd,depmod)
1096
1097ifeq ($(CONFIG_MODULE_SIG), y)
1098PHONY += modules_sign
1099modules_sign:
1100    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1101endif
1102
1103else # CONFIG_MODULES
1104
1105# Modules not configured
1106# ---------------------------------------------------------------------------
1107
1108modules modules_install: FORCE
1109    @echo >&2
1110    @echo >&2 "The present kernel configuration has modules disabled."
1111    @echo >&2 "Type 'make config' and enable loadable module support."
1112    @echo >&2 "Then build a kernel with module support enabled."
1113    @echo >&2
1114    @exit 1
1115
1116endif # CONFIG_MODULES
1117
1118###
1119# Cleaning is done on three levels.
1120# make clean Delete most generated files
1121# Leave enough to build external modules
1122# make mrproper Delete the current configuration, and all generated files
1123# make distclean Remove editor backup files, patch leftover files and the like
1124
1125# Directories & files removed with 'make clean'
1126CLEAN_DIRS += $(MODVERDIR)
1127
1128# Directories & files removed with 'make mrproper'
1129MRPROPER_DIRS += include/config usr/include include/generated \
1130          arch/*/include/generated .tmp_objdiff
1131MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1132          Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1133          signing_key.priv signing_key.x509 x509.genkey \
1134          extra_certificates signing_key.x509.keyid \
1135          signing_key.x509.signer include/linux/version.h
1136
1137# clean - Delete most, but leave enough to build external modules
1138#
1139clean: rm-dirs := $(CLEAN_DIRS)
1140clean: rm-files := $(CLEAN_FILES)
1141clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1142
1143PHONY += $(clean-dirs) clean archclean vmlinuxclean
1144$(clean-dirs):
1145    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1146
1147vmlinuxclean:
1148    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1149
1150clean: archclean vmlinuxclean
1151
1152# mrproper - Delete all generated files, including .config
1153#
1154mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1155mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1156mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1157
1158PHONY += $(mrproper-dirs) mrproper archmrproper
1159$(mrproper-dirs):
1160    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1161
1162mrproper: clean archmrproper $(mrproper-dirs)
1163    $(call cmd,rmdirs)
1164    $(call cmd,rmfiles)
1165
1166# distclean
1167#
1168PHONY += distclean
1169
1170distclean: mrproper
1171    @find $(srctree) $(RCS_FIND_IGNORE) \
1172        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1173        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1174        -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1175        -type f -print | xargs rm -f
1176
1177
1178# Packaging of the kernel to various formats
1179# ---------------------------------------------------------------------------
1180# rpm target kept for backward compatibility
1181package-dir := scripts/package
1182
1183%src-pkg: FORCE
1184    $(Q)$(MAKE) $(build)=$(package-dir) $@
1185%pkg: include/config/kernel.release FORCE
1186    $(Q)$(MAKE) $(build)=$(package-dir) $@
1187rpm: include/config/kernel.release FORCE
1188    $(Q)$(MAKE) $(build)=$(package-dir) $@
1189
1190
1191# Brief documentation of the typical targets used
1192# ---------------------------------------------------------------------------
1193
1194boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1195boards := $(notdir $(boards))
1196board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1197board-dirs := $(sort $(notdir $(board-dirs:/=)))
1198
1199help:
1200    @echo 'Cleaning targets:'
1201    @echo ' clean - Remove most generated files but keep the config and'
1202    @echo ' enough build support to build external modules'
1203    @echo ' mrproper - Remove all generated files + config + various backup files'
1204    @echo ' distclean - mrproper + remove editor backup and patch files'
1205    @echo ''
1206    @echo 'Configuration targets:'
1207    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1208    @echo ''
1209    @echo 'Other generic targets:'
1210    @echo ' all - Build all targets marked with [*]'
1211    @echo '* vmlinux - Build the bare kernel'
1212    @echo '* modules - Build all modules'
1213    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1214    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1215    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1216    @echo ' dir/ - Build all files in dir and below'
1217    @echo ' dir/file.[oisS] - Build specified target only'
1218    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1219    @echo ' (requires a recent binutils and recent build (System.map))'
1220    @echo ' dir/file.ko - Build module including final link'
1221    @echo ' modules_prepare - Set up for building external modules'
1222    @echo ' tags/TAGS - Generate tags file for editors'
1223    @echo ' cscope - Generate cscope index'
1224    @echo ' gtags - Generate GNU GLOBAL index'
1225    @echo ' kernelrelease - Output the release version string'
1226    @echo ' kernelversion - Output the version stored in Makefile'
1227    @echo ' image_name - Output the image name'
1228    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1229     echo ' (default: $(INSTALL_HDR_PATH))'; \
1230     echo ''
1231    @echo 'Static analysers'
1232    @echo ' checkstack - Generate a list of stack hogs'
1233    @echo ' namespacecheck - Name space analysis on compiled kernel'
1234    @echo ' versioncheck - Sanity check on version.h usage'
1235    @echo ' includecheck - Check for duplicate included header files'
1236    @echo ' export_report - List the usages of all exported symbols'
1237    @echo ' headers_check - Sanity check on exported headers'
1238    @echo ' headerdep - Detect inclusion cycles in headers'
1239    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1240    @echo ''
1241    @echo 'Kernel packaging:'
1242    @$(MAKE) $(build)=$(package-dir) help
1243    @echo ''
1244    @echo 'Documentation targets:'
1245    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1246    @echo ''
1247    @echo 'Architecture specific targets ($(SRCARCH)):'
1248    @$(if $(archhelp),$(archhelp),\
1249        echo ' No architecture specific help defined for $(SRCARCH)')
1250    @echo ''
1251    @$(if $(boards), \
1252        $(foreach b, $(boards), \
1253        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1254        echo '')
1255    @$(if $(board-dirs), \
1256        $(foreach b, $(board-dirs), \
1257        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1258        printf " %-16s - Show all of the above\\n" help-boards; \
1259        echo '')
1260
1261    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1262    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1263    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1264    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1265    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1266    @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1267    @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1268    @echo ' 1: warnings which may be relevant and do not occur too often'
1269    @echo ' 2: warnings which occur quite often but may still be relevant'
1270    @echo ' 3: more obscure warnings, can most likely be ignored'
1271    @echo ' Multiple levels can be combined with W=12 or W=123'
1272    @echo ''
1273    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1274    @echo 'For further info see the ./README file'
1275
1276
1277help-board-dirs := $(addprefix help-,$(board-dirs))
1278
1279help-boards: $(help-board-dirs)
1280
1281boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1282
1283$(help-board-dirs): help-%:
1284    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1285    @$(if $(boards-per-dir), \
1286        $(foreach b, $(boards-per-dir), \
1287        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1288        echo '')
1289
1290
1291# Documentation targets
1292# ---------------------------------------------------------------------------
1293%docs: scripts_basic FORCE
1294    $(Q)$(MAKE) $(build)=scripts build_docproc
1295    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1296
1297else # KBUILD_EXTMOD
1298
1299###
1300# External module support.
1301# When building external modules the kernel used as basis is considered
1302# read-only, and no consistency checks are made and the make
1303# system is not used on the basis kernel. If updates are required
1304# in the basis kernel ordinary make commands (without M=...) must
1305# be used.
1306#
1307# The following are the only valid targets when building external
1308# modules.
1309# make M=dir clean Delete all automatically generated files
1310# make M=dir modules Make all modules in specified dir
1311# make M=dir Same as 'make M=dir modules'
1312# make M=dir modules_install
1313# Install the modules built in the module directory
1314# Assumes install directory is already created
1315
1316# We are always building modules
1317KBUILD_MODULES := 1
1318PHONY += crmodverdir
1319crmodverdir:
1320    $(cmd_crmodverdir)
1321
1322PHONY += $(objtree)/Module.symvers
1323$(objtree)/Module.symvers:
1324    @test -e $(objtree)/Module.symvers || ( \
1325    echo; \
1326    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1327    echo " is missing; modules will have no dependencies and modversions."; \
1328    echo )
1329
1330module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1331PHONY += $(module-dirs) modules
1332$(module-dirs): crmodverdir $(objtree)/Module.symvers
1333    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1334
1335modules: $(module-dirs)
1336    @$(kecho) ' Building modules, stage 2.';
1337    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1338
1339PHONY += modules_install
1340modules_install: _emodinst_ _emodinst_post
1341
1342install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1343PHONY += _emodinst_
1344_emodinst_:
1345    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1346    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1347
1348PHONY += _emodinst_post
1349_emodinst_post: _emodinst_
1350    $(call cmd,depmod)
1351
1352clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1353
1354PHONY += $(clean-dirs) clean
1355$(clean-dirs):
1356    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1357
1358clean: rm-dirs := $(MODVERDIR)
1359clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1360
1361help:
1362    @echo ' Building external modules.'
1363    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1364    @echo ''
1365    @echo ' modules - default target, build the module(s)'
1366    @echo ' modules_install - install the module'
1367    @echo ' clean - remove generated files in module directory only'
1368    @echo ''
1369
1370# Dummies...
1371PHONY += prepare scripts
1372prepare: ;
1373scripts: ;
1374endif # KBUILD_EXTMOD
1375
1376clean: $(clean-dirs)
1377    $(call cmd,rmdirs)
1378    $(call cmd,rmfiles)
1379    @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1380        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1381        -o -name '*.ko.*' \
1382        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1383        -o -name '*.symtypes' -o -name 'modules.order' \
1384        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1385        -o -name '*.gcno' \) -type f -print | xargs rm -f
1386
1387# Generate tags for editors
1388# ---------------------------------------------------------------------------
1389quiet_cmd_tags = GEN $@
1390      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1391
1392tags TAGS cscope gtags: FORCE
1393    $(call cmd,tags)
1394
1395# Scripts to check various things for consistency
1396# ---------------------------------------------------------------------------
1397
1398PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1399
1400includecheck:
1401    find $(srctree)/* $(RCS_FIND_IGNORE) \
1402        -name '*.[hcS]' -type f -print | sort \
1403        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1404
1405versioncheck:
1406    find $(srctree)/* $(RCS_FIND_IGNORE) \
1407        -name '*.[hcS]' -type f -print | sort \
1408        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1409
1410coccicheck:
1411    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1412
1413namespacecheck:
1414    $(PERL) $(srctree)/scripts/namespace.pl
1415
1416export_report:
1417    $(PERL) $(srctree)/scripts/export_report.pl
1418
1419endif #ifeq ($(config-targets),1)
1420endif #ifeq ($(mixed-targets),1)
1421
1422PHONY += checkstack kernelrelease kernelversion image_name
1423
1424# UML needs a little special treatment here. It wants to use the host
1425# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1426# else wants $(ARCH), including people doing cross-builds, which means
1427# that $(SUBARCH) doesn't work here.
1428ifeq ($(ARCH), um)
1429CHECKSTACK_ARCH := $(SUBARCH)
1430else
1431CHECKSTACK_ARCH := $(ARCH)
1432endif
1433checkstack:
1434    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1435    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1436
1437kernelrelease:
1438    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1439
1440kernelversion:
1441    @echo $(KERNELVERSION)
1442
1443image_name:
1444    @echo $(KBUILD_IMAGE)
1445
1446# Clear a bunch of variables before executing the submake
1447tools/: FORCE
1448    $(Q)mkdir -p $(objtree)/tools
1449    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1450
1451tools/%: FORCE
1452    $(Q)mkdir -p $(objtree)/tools
1453    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1454
1455# Single targets
1456# ---------------------------------------------------------------------------
1457# Single targets are compatible with:
1458# - build with mixed source and output
1459# - build with separate output dir 'make O=...'
1460# - external modules
1461#
1462# target-dir => where to store outputfile
1463# build-dir => directory in kernel source tree to use
1464
1465ifeq ($(KBUILD_EXTMOD),)
1466        build-dir = $(patsubst %/,%,$(dir $@))
1467        target-dir = $(dir $@)
1468else
1469        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1470        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1471        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1472endif
1473
1474%.s: %.c prepare scripts FORCE
1475    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1476%.i: %.c prepare scripts FORCE
1477    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1478%.o: %.c prepare scripts FORCE
1479    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1480%.lst: %.c prepare scripts FORCE
1481    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1482%.s: %.S prepare scripts FORCE
1483    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1484%.o: %.S prepare scripts FORCE
1485    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1486%.symtypes: %.c prepare scripts FORCE
1487    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1488
1489# Modules
1490/: prepare scripts FORCE
1491    $(cmd_crmodverdir)
1492    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1493    $(build)=$(build-dir)
1494%/: prepare scripts FORCE
1495    $(cmd_crmodverdir)
1496    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1497    $(build)=$(build-dir)
1498%.ko: prepare scripts FORCE
1499    $(cmd_crmodverdir)
1500    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1501    $(build)=$(build-dir) $(@:.ko=.o)
1502    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1503
1504# FIXME Should go into a make.lib or something
1505# ===========================================================================
1506
1507quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1508      cmd_rmdirs = rm -rf $(rm-dirs)
1509
1510quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1511      cmd_rmfiles = rm -f $(rm-files)
1512
1513# Run depmod only if we have System.map and depmod is executable
1514quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1515      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1516                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1517
1518# Create temporary dir for module support files
1519# clean it up only when building all modules
1520cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1521                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1522
1523# read all saved command lines
1524
1525targets := $(wildcard $(sort $(targets)))
1526cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1527
1528ifneq ($(cmd_files),)
1529  $(cmd_files): ; # Do not try to update included dependency files
1530  include $(cmd_files)
1531endif
1532
1533# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1534# Usage:
1535# $(Q)$(MAKE) $(clean)=dir
1536clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1537
1538endif # skip-makefile
1539
1540PHONY += FORCE
1541FORCE:
1542
1543# Declare the contents of the .PHONY variable as phony. We keep that
1544# information in a variable so we can use it in if_changed and friends.
1545.PHONY: $(PHONY)
1546

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