Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1VERSION = 3
2PATCHLEVEL = 16
3SUBLEVEL = 0
4EXTRAVERSION = -rc4
5NAME = Shuffling Zombie Juror
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not:
14# o use make's built-in rules and variables
15# (this increases performance and avoids hard-to-debug behaviour);
16# o print "Entering directory ...";
17MAKEFLAGS += -rR --no-print-directory
18
19# Avoid funny character set dependencies
20unexport LC_ALL
21LC_COLLATE=C
22LC_NUMERIC=C
23export LC_COLLATE LC_NUMERIC
24
25# Avoid interference with shell env settings
26unexport GREP_OPTIONS
27
28# We are using a recursive build, so we need to do a little thinking
29# to get the ordering right.
30#
31# Most importantly: sub-Makefiles should only ever modify files in
32# their own directory. If in some directory we have a dependency on
33# a file in another dir (which doesn't happen often, but it's often
34# unavoidable when linking the built-in.o targets which finally
35# turn into vmlinux), we will call a sub make in that other dir, and
36# after that we are sure that everything which is in that other dir
37# is now up to date.
38#
39# The only cases where we need to modify files which have global
40# effects are thus separated out and done before the recursive
41# descending is started. They are now explicitly listed as the
42# prepare rule.
43
44# To put more focus on warnings, be less verbose as default
45# Use 'make V=1' to see the full commands
46
47ifeq ("$(origin V)", "command line")
48 KBUILD_VERBOSE = $(V)
49endif
50ifndef KBUILD_VERBOSE
51 KBUILD_VERBOSE = 0
52endif
53
54# Call a source code checker (by default, "sparse") as part of the
55# C compilation.
56#
57# Use 'make C=1' to enable checking of only re-compiled files.
58# Use 'make C=2' to enable checking of *all* source files, regardless
59# of whether they are re-compiled or not.
60#
61# See the file "Documentation/sparse.txt" for more details, including
62# where to get the "sparse" utility.
63
64ifeq ("$(origin C)", "command line")
65 KBUILD_CHECKSRC = $(C)
66endif
67ifndef KBUILD_CHECKSRC
68 KBUILD_CHECKSRC = 0
69endif
70
71# Use make M=dir to specify directory of external module to build
72# Old syntax make ... SUBDIRS=$PWD is still supported
73# Setting the environment variable KBUILD_EXTMOD take precedence
74ifdef SUBDIRS
75 KBUILD_EXTMOD ?= $(SUBDIRS)
76endif
77
78ifeq ("$(origin M)", "command line")
79 KBUILD_EXTMOD := $(M)
80endif
81
82# kbuild supports saving output files in a separate directory.
83# To locate output files in a separate directory two syntaxes are supported.
84# In both cases the working directory must be the root of the kernel src.
85# 1) O=
86# Use "make O=dir/to/store/output/files/"
87#
88# 2) Set KBUILD_OUTPUT
89# Set the environment variable KBUILD_OUTPUT to point to the directory
90# where the output files shall be placed.
91# export KBUILD_OUTPUT=dir/to/store/output/files/
92# make
93#
94# The O= assignment takes precedence over the KBUILD_OUTPUT environment
95# variable.
96
97
98# KBUILD_SRC is set on invocation of make in OBJ directory
99# KBUILD_SRC is not intended to be used by the regular user (for now)
100ifeq ($(KBUILD_SRC),)
101
102# OK, Make called in directory where kernel src resides
103# Do we want to locate output files in a separate directory?
104ifeq ("$(origin O)", "command line")
105 KBUILD_OUTPUT := $(O)
106endif
107
108# That's our default target when none is given on the command line
109PHONY := _all
110_all:
111
112# Cancel implicit rules on top Makefile
113$(CURDIR)/Makefile Makefile: ;
114
115ifneq ($(KBUILD_OUTPUT),)
116# Invoke a second make in the output directory, passing relevant variables
117# check that the output directory actually exists
118saved-output := $(KBUILD_OUTPUT)
119KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
120 && /bin/pwd)
121$(if $(KBUILD_OUTPUT),, \
122 $(error failed to create output directory "$(saved-output)"))
123
124PHONY += $(MAKECMDGOALS) sub-make
125
126$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
127 @:
128
129# Fake the "Entering directory" message once, so that IDEs/editors are
130# able to understand relative filenames.
131sub-make: FORCE
132 @echo "make[1]: Entering directory \`$(KBUILD_OUTPUT)'"
133 $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \
134 KBUILD_SRC=$(CURDIR) \
135 KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile \
136 $(filter-out _all sub-make,$(MAKECMDGOALS))
137
138# Leave processing to above invocation of make
139skip-makefile := 1
140endif # ifneq ($(KBUILD_OUTPUT),)
141endif # ifeq ($(KBUILD_SRC),)
142
143# We process the rest of the Makefile if this is the final invocation of make
144ifeq ($(skip-makefile),)
145
146# If building an external module we do not care about the all: rule
147# but instead _all depend on modules
148PHONY += all
149ifeq ($(KBUILD_EXTMOD),)
150_all: all
151else
152_all: modules
153endif
154
155ifeq ($(KBUILD_SRC),)
156 # building in the source tree
157 srctree := .
158else
159 ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
160 # building in a subdirectory of the source tree
161 srctree := ..
162 else
163 srctree := $(KBUILD_SRC)
164 endif
165endif
166objtree := .
167src := $(srctree)
168obj := $(objtree)
169
170VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
171
172export srctree objtree VPATH
173
174
175# SUBARCH tells the usermode build what the underlying arch is. That is set
176# first, and if a usermode build is happening, the "ARCH=um" on the command
177# line overrides the setting of ARCH below. If a native build is happening,
178# then ARCH is assigned, getting whatever value it gets normally, and
179# SUBARCH is subsequently ignored.
180
181SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
182 -e s/sun4u/sparc64/ \
183 -e s/arm.*/arm/ -e s/sa110/arm/ \
184 -e s/s390x/s390/ -e s/parisc64/parisc/ \
185 -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
186 -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
187
188# Cross compiling and selecting different set of gcc/bin-utils
189# ---------------------------------------------------------------------------
190#
191# When performing cross compilation for other architectures ARCH shall be set
192# to the target architecture. (See arch/* for the possibilities).
193# ARCH can be set during invocation of make:
194# make ARCH=ia64
195# Another way is to have ARCH set in the environment.
196# The default ARCH is the host where make is executed.
197
198# CROSS_COMPILE specify the prefix used for all executables used
199# during compilation. Only gcc and related bin-utils executables
200# are prefixed with $(CROSS_COMPILE).
201# CROSS_COMPILE can be set on the command line
202# make CROSS_COMPILE=ia64-linux-
203# Alternatively CROSS_COMPILE can be set in the environment.
204# A third alternative is to store a setting in .config so that plain
205# "make" in the configured kernel build directory always uses that.
206# Default value for CROSS_COMPILE is not to prefix executables
207# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
208ARCH ?= $(SUBARCH)
209CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
210
211# Architecture as present in compile.h
212UTS_MACHINE := $(ARCH)
213SRCARCH := $(ARCH)
214
215# Additional ARCH settings for x86
216ifeq ($(ARCH),i386)
217 SRCARCH := x86
218endif
219ifeq ($(ARCH),x86_64)
220 SRCARCH := x86
221endif
222
223# Additional ARCH settings for sparc
224ifeq ($(ARCH),sparc32)
225 SRCARCH := sparc
226endif
227ifeq ($(ARCH),sparc64)
228 SRCARCH := sparc
229endif
230
231# Additional ARCH settings for sh
232ifeq ($(ARCH),sh64)
233 SRCARCH := sh
234endif
235
236# Additional ARCH settings for tile
237ifeq ($(ARCH),tilepro)
238 SRCARCH := tile
239endif
240ifeq ($(ARCH),tilegx)
241 SRCARCH := tile
242endif
243
244# Where to locate arch specific headers
245hdr-arch := $(SRCARCH)
246
247KCONFIG_CONFIG ?= .config
248export KCONFIG_CONFIG
249
250# SHELL used by kbuild
251CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
252 else if [ -x /bin/bash ]; then echo /bin/bash; \
253 else echo sh; fi ; fi)
254
255HOSTCC = gcc
256HOSTCXX = g++
257HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer
258HOSTCXXFLAGS = -O2
259
260ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
261HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
262 -Wno-missing-field-initializers -fno-delete-null-pointer-checks
263endif
264
265# Decide whether to build built-in, modular, or both.
266# Normally, just do built-in.
267
268KBUILD_MODULES :=
269KBUILD_BUILTIN := 1
270
271# If we have only "make modules", don't compile built-in objects.
272# When we're building modules with modversions, we need to consider
273# the built-in objects during the descend as well, in order to
274# make sure the checksums are up to date before we record them.
275
276ifeq ($(MAKECMDGOALS),modules)
277 KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
278endif
279
280# If we have "make <whatever> modules", compile modules
281# in addition to whatever we do anyway.
282# Just "make" or "make all" shall build modules as well
283
284ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
285 KBUILD_MODULES := 1
286endif
287
288ifeq ($(MAKECMDGOALS),)
289 KBUILD_MODULES := 1
290endif
291
292export KBUILD_MODULES KBUILD_BUILTIN
293export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
294
295# Beautify output
296# ---------------------------------------------------------------------------
297#
298# Normally, we echo the whole command before executing it. By making
299# that echo $($(quiet)$(cmd)), we now have the possibility to set
300# $(quiet) to choose other forms of output instead, e.g.
301#
302# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
303# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
304#
305# If $(quiet) is empty, the whole command will be printed.
306# If it is set to "quiet_", only the short version will be printed.
307# If it is set to "silent_", nothing will be printed at all, since
308# the variable $(silent_cmd_cc_o_c) doesn't exist.
309#
310# A simple variant is to prefix commands with $(Q) - that's useful
311# for commands that shall be hidden in non-verbose mode.
312#
313# $(Q)ln $@ :<
314#
315# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
316# If KBUILD_VERBOSE equals 1 then the above command is displayed.
317
318ifeq ($(KBUILD_VERBOSE),1)
319 quiet =
320 Q =
321else
322 quiet=quiet_
323 Q = @
324endif
325
326# If the user is running make -s (silent mode), suppress echoing of
327# commands
328
329ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
330ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
331 quiet=silent_
332endif
333else # make-3.8x
334ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
335 quiet=silent_
336endif
337endif
338
339export quiet Q KBUILD_VERBOSE
340
341ifneq ($(CC),)
342ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
343COMPILER := clang
344else
345COMPILER := gcc
346endif
347export COMPILER
348endif
349
350# Look for make include files relative to root of kernel src
351MAKEFLAGS += --include-dir=$(srctree)
352
353# We need some generic definitions (do not try to remake the file).
354$(srctree)/scripts/Kbuild.include: ;
355include $(srctree)/scripts/Kbuild.include
356
357# Make variables (CC, etc...)
358AS = $(CROSS_COMPILE)as
359LD = $(CROSS_COMPILE)ld
360CC = $(CROSS_COMPILE)gcc
361CPP = $(CC) -E
362AR = $(CROSS_COMPILE)ar
363NM = $(CROSS_COMPILE)nm
364STRIP = $(CROSS_COMPILE)strip
365OBJCOPY = $(CROSS_COMPILE)objcopy
366OBJDUMP = $(CROSS_COMPILE)objdump
367AWK = awk
368GENKSYMS = scripts/genksyms/genksyms
369INSTALLKERNEL := installkernel
370DEPMOD = /sbin/depmod
371PERL = perl
372CHECK = sparse
373
374CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
375 -Wbitwise -Wno-return-void $(CF)
376CFLAGS_MODULE =
377AFLAGS_MODULE =
378LDFLAGS_MODULE =
379CFLAGS_KERNEL =
380AFLAGS_KERNEL =
381CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
382
383
384# Use USERINCLUDE when you must reference the UAPI directories only.
385USERINCLUDE := \
386 -I$(srctree)/arch/$(hdr-arch)/include/uapi \
387 -Iarch/$(hdr-arch)/include/generated/uapi \
388 -I$(srctree)/include/uapi \
389 -Iinclude/generated/uapi \
390 -include $(srctree)/include/linux/kconfig.h
391
392# Use LINUXINCLUDE when you must reference the include/ directory.
393# Needed to be compatible with the O= option
394LINUXINCLUDE := \
395 -I$(srctree)/arch/$(hdr-arch)/include \
396 -Iarch/$(hdr-arch)/include/generated \
397 $(if $(KBUILD_SRC), -I$(srctree)/include) \
398 -Iinclude \
399 $(USERINCLUDE)
400
401KBUILD_CPPFLAGS := -D__KERNEL__
402
403KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
404 -fno-strict-aliasing -fno-common \
405 -Werror-implicit-function-declaration \
406 -Wno-format-security
407
408KBUILD_AFLAGS_KERNEL :=
409KBUILD_CFLAGS_KERNEL :=
410KBUILD_AFLAGS := -D__ASSEMBLY__
411KBUILD_AFLAGS_MODULE := -DMODULE
412KBUILD_CFLAGS_MODULE := -DMODULE
413KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
414
415# Read KERNELRELEASE from include/config/kernel.release (if it exists)
416KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
417KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
418
419export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
420export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
421export CPP AR NM STRIP OBJCOPY OBJDUMP
422export MAKE AWK GENKSYMS INSTALLKERNEL PERL UTS_MACHINE
423export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
424
425export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
426export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
427export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
428export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
429export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
430export KBUILD_ARFLAGS
431
432# When compiling out-of-tree modules, put MODVERDIR in the module
433# tree rather than in the kernel tree. The kernel tree might
434# even be read-only.
435export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
436
437# Files to ignore in find ... statements
438
439export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
440 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
441 -prune -o
442export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
443 --exclude CVS --exclude .pc --exclude .hg --exclude .git
444
445# ===========================================================================
446# Rules shared between *config targets and build targets
447
448# Basic helpers built in scripts/
449PHONY += scripts_basic
450scripts_basic:
451 $(Q)$(MAKE) $(build)=scripts/basic
452 $(Q)rm -f .tmp_quiet_recordmcount
453
454# To avoid any implicit rule to kick in, define an empty command.
455scripts/basic/%: scripts_basic ;
456
457PHONY += outputmakefile
458# outputmakefile generates a Makefile in the output directory, if using a
459# separate output directory. This allows convenient use of make in the
460# output directory.
461outputmakefile:
462ifneq ($(KBUILD_SRC),)
463 $(Q)ln -fsn $(srctree) source
464 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
465 $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
466endif
467
468# Support for using generic headers in asm-generic
469PHONY += asm-generic
470asm-generic:
471 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
472 src=asm obj=arch/$(SRCARCH)/include/generated/asm
473 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
474 src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
475
476# To make sure we do not include .config for any of the *config targets
477# catch them early, and hand them over to scripts/kconfig/Makefile
478# It is allowed to specify more targets when calling make, including
479# mixing *config targets and build targets.
480# For example 'make oldconfig all'.
481# Detect when mixed targets is specified, and make a second invocation
482# of make so .config is not included in this case either (for *config).
483
484version_h := include/generated/uapi/linux/version.h
485
486no-dot-config-targets := clean mrproper distclean \
487 cscope gtags TAGS tags help %docs check% coccicheck \
488 $(version_h) headers_% archheaders archscripts \
489 kernelversion %src-pkg
490
491config-targets := 0
492mixed-targets := 0
493dot-config := 1
494
495ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
496 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
497 dot-config := 0
498 endif
499endif
500
501ifeq ($(KBUILD_EXTMOD),)
502 ifneq ($(filter config %config,$(MAKECMDGOALS)),)
503 config-targets := 1
504 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
505 mixed-targets := 1
506 endif
507 endif
508endif
509
510ifeq ($(mixed-targets),1)
511# ===========================================================================
512# We're called with mixed targets (*config and build targets).
513# Handle them one by one.
514
515PHONY += $(MAKECMDGOALS) __build_one_by_one
516
517$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
518 @:
519
520__build_one_by_one:
521 $(Q)set -e; \
522 for i in $(MAKECMDGOALS); do \
523 $(MAKE) -f $(srctree)/Makefile $$i; \
524 done
525
526else
527ifeq ($(config-targets),1)
528# ===========================================================================
529# *config targets only - make sure prerequisites are updated, and descend
530# in scripts/kconfig to make the *config target
531
532# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
533# KBUILD_DEFCONFIG may point out an alternative default configuration
534# used for 'make defconfig'
535include $(srctree)/arch/$(SRCARCH)/Makefile
536export KBUILD_DEFCONFIG KBUILD_KCONFIG
537
538config: scripts_basic outputmakefile FORCE
539 $(Q)$(MAKE) $(build)=scripts/kconfig $@
540
541%config: scripts_basic outputmakefile FORCE
542 $(Q)$(MAKE) $(build)=scripts/kconfig $@
543
544else
545# ===========================================================================
546# Build targets only - this includes vmlinux, arch specific targets, clean
547# targets and others. In general all targets except *config targets.
548
549ifeq ($(KBUILD_EXTMOD),)
550# Additional helpers built in scripts/
551# Carefully list dependencies so we do not try to build scripts twice
552# in parallel
553PHONY += scripts
554scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
555 asm-generic
556 $(Q)$(MAKE) $(build)=$(@)
557
558# Objects we will link into vmlinux / subdirs we need to visit
559init-y := init/
560drivers-y := drivers/ sound/ firmware/
561net-y := net/
562libs-y := lib/
563core-y := usr/
564endif # KBUILD_EXTMOD
565
566ifeq ($(dot-config),1)
567# Read in config
568-include include/config/auto.conf
569
570ifeq ($(KBUILD_EXTMOD),)
571# Read in dependencies to all Kconfig* files, make sure to run
572# oldconfig if changes are detected.
573-include include/config/auto.conf.cmd
574
575# To avoid any implicit rule to kick in, define an empty command
576$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
577
578# If .config is newer than include/config/auto.conf, someone tinkered
579# with it and forgot to run make oldconfig.
580# if auto.conf.cmd is missing then we are probably in a cleaned tree so
581# we execute the config step to be sure to catch updated Kconfig files
582include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
583 $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
584else
585# external modules needs include/generated/autoconf.h and include/config/auto.conf
586# but do not care if they are up-to-date. Use auto.conf to trigger the test
587PHONY += include/config/auto.conf
588
589include/config/auto.conf:
590 $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
591 echo >&2; \
592 echo >&2 " ERROR: Kernel configuration is invalid."; \
593 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
594 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
595 echo >&2 ; \
596 /bin/false)
597
598endif # KBUILD_EXTMOD
599
600else
601# Dummy target needed, because used as prerequisite
602include/config/auto.conf: ;
603endif # $(dot-config)
604
605# The all: target is the default when no target is given on the
606# command line.
607# This allow a user to issue only 'make' to build a kernel including modules
608# Defaults to vmlinux, but the arch makefile usually adds further targets
609all: vmlinux
610
611include $(srctree)/arch/$(SRCARCH)/Makefile
612
613KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
614
615ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
616KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
617else
618KBUILD_CFLAGS += -O2
619endif
620
621ifdef CONFIG_READABLE_ASM
622# Disable optimizations that make assembler listings hard to read.
623# reorder blocks reorders the control in the function
624# ipa clone creates specialized cloned functions
625# partial inlining inlines only parts of functions
626KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
627 $(call cc-option,-fno-ipa-cp-clone,) \
628 $(call cc-option,-fno-partial-inlining)
629endif
630
631ifneq ($(CONFIG_FRAME_WARN),0)
632KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
633endif
634
635# Handle stack protector mode.
636ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
637 stackp-flag := -fstack-protector
638 ifeq ($(call cc-option, $(stackp-flag)),)
639 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
640 -fstack-protector not supported by compiler)
641 endif
642else
643ifdef CONFIG_CC_STACKPROTECTOR_STRONG
644 stackp-flag := -fstack-protector-strong
645 ifeq ($(call cc-option, $(stackp-flag)),)
646 $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
647 -fstack-protector-strong not supported by compiler)
648 endif
649else
650 # Force off for distro compilers that enable stack protector by default.
651 stackp-flag := $(call cc-option, -fno-stack-protector)
652endif
653endif
654KBUILD_CFLAGS += $(stackp-flag)
655
656ifeq ($(COMPILER),clang)
657KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
658KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
659KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
660KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
661KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
662# Quiet clang warning: comparison of unsigned expression < 0 is always false
663KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
664# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
665# source of a reference will be _MergedGlobals and not on of the whitelisted names.
666# See modpost pattern 2
667KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
668else
669
670# This warning generated too much noise in a regular build.
671# Use make W=1 to enable this warning (see scripts/Makefile.build)
672KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
673endif
674
675ifdef CONFIG_FRAME_POINTER
676KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
677else
678# Some targets (ARM with Thumb2, for example), can't be built with frame
679# pointers. For those, we don't have FUNCTION_TRACER automatically
680# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
681# incompatible with -fomit-frame-pointer with current GCC, so we don't use
682# -fomit-frame-pointer with FUNCTION_TRACER.
683ifndef CONFIG_FUNCTION_TRACER
684KBUILD_CFLAGS += -fomit-frame-pointer
685endif
686endif
687
688ifdef CONFIG_DEBUG_INFO
689KBUILD_CFLAGS += -g
690KBUILD_AFLAGS += -Wa,-gdwarf-2
691endif
692
693ifdef CONFIG_DEBUG_INFO_REDUCED
694KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
695 $(call cc-option,-fno-var-tracking)
696endif
697
698ifdef CONFIG_FUNCTION_TRACER
699ifdef CONFIG_HAVE_FENTRY
700CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
701endif
702KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
703KBUILD_AFLAGS += $(CC_USING_FENTRY)
704ifdef CONFIG_DYNAMIC_FTRACE
705 ifdef CONFIG_HAVE_C_RECORDMCOUNT
706 BUILD_C_RECORDMCOUNT := y
707 export BUILD_C_RECORDMCOUNT
708 endif
709endif
710endif
711
712# We trigger additional mismatches with less inlining
713ifdef CONFIG_DEBUG_SECTION_MISMATCH
714KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
715endif
716
717# arch Makefile may override CC so keep this after arch Makefile is included
718NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
719CHECKFLAGS += $(NOSTDINC_FLAGS)
720
721# warn about C99 declaration after statement
722KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
723
724# disable pointer signed / unsigned warnings in gcc 4.0
725KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
726
727# disable invalid "can't wrap" optimizations for signed / pointers
728KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
729
730# conserve stack if available
731KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
732
733# disallow errors like 'EXPORT_GPL(foo);' with missing header
734KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
735
736# require functions to have arguments in prototypes, not empty 'int foo()'
737KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
738
739# Prohibit date/time macros, which would make the build non-deterministic
740KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
741
742# use the deterministic mode of AR if available
743KBUILD_ARFLAGS := $(call ar-option,D)
744
745# check for 'asm goto'
746ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
747 KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
748endif
749
750include $(srctree)/scripts/Makefile.extrawarn
751
752# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
753KBUILD_CPPFLAGS += $(KCPPFLAGS)
754KBUILD_AFLAGS += $(KAFLAGS)
755KBUILD_CFLAGS += $(KCFLAGS)
756
757# Use --build-id when available.
758LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
759 $(call cc-ldoption, -Wl$(comma)--build-id,))
760KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
761LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
762
763ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
764LDFLAGS_vmlinux += $(call ld-option, -X,)
765endif
766
767# Default kernel image to build when no specific target is given.
768# KBUILD_IMAGE may be overruled on the command line or
769# set in the environment
770# Also any assignments in arch/$(ARCH)/Makefile take precedence over
771# this default value
772export KBUILD_IMAGE ?= vmlinux
773
774#
775# INSTALL_PATH specifies where to place the updated kernel and system map
776# images. Default is /boot, but you can set it to other values
777export INSTALL_PATH ?= /boot
778
779#
780# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
781# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
782# an argument if needed. Otherwise it defaults to the kernel install path
783#
784export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
785
786#
787# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
788# relocations required by build roots. This is not defined in the
789# makefile but the argument can be passed to make if needed.
790#
791
792MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
793export MODLIB
794
795#
796# INSTALL_MOD_STRIP, if defined, will cause modules to be
797# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
798# the default option --strip-debug will be used. Otherwise,
799# INSTALL_MOD_STRIP value will be used as the options to the strip command.
800
801ifdef INSTALL_MOD_STRIP
802ifeq ($(INSTALL_MOD_STRIP),1)
803mod_strip_cmd = $(STRIP) --strip-debug
804else
805mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
806endif # INSTALL_MOD_STRIP=1
807else
808mod_strip_cmd = true
809endif # INSTALL_MOD_STRIP
810export mod_strip_cmd
811
812# Select initial ramdisk compression format, default is gzip(1).
813# This shall be used by the dracut(8) tool while creating an initramfs image.
814#
815INITRD_COMPRESS-y := gzip
816INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
817INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
818INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
819INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
820INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
821# do not export INITRD_COMPRESS, since we didn't actually
822# choose a sane default compression above.
823# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
824
825ifdef CONFIG_MODULE_SIG_ALL
826MODSECKEY = ./signing_key.priv
827MODPUBKEY = ./signing_key.x509
828export MODPUBKEY
829mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
830else
831mod_sign_cmd = true
832endif
833export mod_sign_cmd
834
835
836ifeq ($(KBUILD_EXTMOD),)
837core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
838
839vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
840 $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
841 $(net-y) $(net-m) $(libs-y) $(libs-m)))
842
843vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
844 $(init-n) $(init-) \
845 $(core-n) $(core-) $(drivers-n) $(drivers-) \
846 $(net-n) $(net-) $(libs-n) $(libs-))))
847
848init-y := $(patsubst %/, %/built-in.o, $(init-y))
849core-y := $(patsubst %/, %/built-in.o, $(core-y))
850drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
851net-y := $(patsubst %/, %/built-in.o, $(net-y))
852libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
853libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
854libs-y := $(libs-y1) $(libs-y2)
855
856# Externally visible symbols (used by link-vmlinux.sh)
857export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
858export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
859export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
860export LDFLAGS_vmlinux
861# used by scripts/pacmage/Makefile
862export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
863
864vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
865
866# Final link of vmlinux
867 cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
868quiet_cmd_link-vmlinux = LINK $@
869
870# Include targets which we want to
871# execute if the rest of the kernel build went well.
872vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
873ifdef CONFIG_HEADERS_CHECK
874 $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
875endif
876ifdef CONFIG_SAMPLES
877 $(Q)$(MAKE) $(build)=samples
878endif
879ifdef CONFIG_BUILD_DOCSRC
880 $(Q)$(MAKE) $(build)=Documentation
881endif
882 +$(call if_changed,link-vmlinux)
883
884# The actual objects are generated when descending,
885# make sure no implicit rule kicks in
886$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
887
888# Handle descending into subdirectories listed in $(vmlinux-dirs)
889# Preset locale variables to speed up the build process. Limit locale
890# tweaks to this spot to avoid wrong language settings when running
891# make menuconfig etc.
892# Error messages still appears in the original language
893
894PHONY += $(vmlinux-dirs)
895$(vmlinux-dirs): prepare scripts
896 $(Q)$(MAKE) $(build)=$@
897
898define filechk_kernel.release
899 echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
900endef
901
902# Store (new) KERNELRELEASE string in include/config/kernel.release
903include/config/kernel.release: include/config/auto.conf FORCE
904 $(call filechk,kernel.release)
905
906
907# Things we need to do before we recursively start building the kernel
908# or the modules are listed in "prepare".
909# A multi level approach is used. prepareN is processed before prepareN-1.
910# archprepare is used in arch Makefiles and when processed asm symlink,
911# version.h and scripts_basic is processed / created.
912
913# Listed in dependency order
914PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
915
916# prepare3 is used to check if we are building in a separate output directory,
917# and if so do:
918# 1) Check that make has not been executed in the kernel src $(srctree)
919prepare3: include/config/kernel.release
920ifneq ($(KBUILD_SRC),)
921 @$(kecho) ' Using $(srctree) as source for kernel'
922 $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
923 echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
924 echo >&2 " in the '$(srctree)' directory.";\
925 /bin/false; \
926 fi;
927endif
928
929# prepare2 creates a makefile if using a separate output directory
930prepare2: prepare3 outputmakefile asm-generic
931
932prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
933 include/config/auto.conf
934 $(cmd_crmodverdir)
935
936archprepare: archheaders archscripts prepare1 scripts_basic
937
938prepare0: archprepare FORCE
939 $(Q)$(MAKE) $(build)=.
940
941# All the preparing..
942prepare: prepare0
943
944# Generate some files
945# ---------------------------------------------------------------------------
946
947# KERNELRELEASE can change from a few different places, meaning version.h
948# needs to be updated, so this check is forced on all builds
949
950uts_len := 64
951define filechk_utsrelease.h
952 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
953 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
954 exit 1; \
955 fi; \
956 (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
957endef
958
959define filechk_version.h
960 (echo \#define LINUX_VERSION_CODE $(shell \
961 expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
962 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
963endef
964
965$(version_h): $(srctree)/Makefile FORCE
966 $(call filechk,version.h)
967
968include/generated/utsrelease.h: include/config/kernel.release FORCE
969 $(call filechk,utsrelease.h)
970
971PHONY += headerdep
972headerdep:
973 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
974 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
975
976# ---------------------------------------------------------------------------
977
978PHONY += depend dep
979depend dep:
980 @echo '*** Warning: make $@ is unnecessary now.'
981
982# ---------------------------------------------------------------------------
983# Firmware install
984INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
985export INSTALL_FW_PATH
986
987PHONY += firmware_install
988firmware_install: FORCE
989 @mkdir -p $(objtree)/firmware
990 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
991
992# ---------------------------------------------------------------------------
993# Kernel headers
994
995#Default location for installed headers
996export INSTALL_HDR_PATH = $(objtree)/usr
997
998hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
999
1000# If we do an all arch process set dst to asm-$(hdr-arch)
1001hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1002
1003PHONY += archheaders
1004archheaders:
1005
1006PHONY += archscripts
1007archscripts:
1008
1009PHONY += __headers
1010__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1011 $(Q)$(MAKE) $(build)=scripts build_unifdef
1012
1013PHONY += headers_install_all
1014headers_install_all:
1015 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1016
1017PHONY += headers_install
1018headers_install: __headers
1019 $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1020 $(error Headers not exportable for the $(SRCARCH) architecture))
1021 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1022 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1023
1024PHONY += headers_check_all
1025headers_check_all: headers_install_all
1026 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1027
1028PHONY += headers_check
1029headers_check: headers_install
1030 $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1031 $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1032
1033# ---------------------------------------------------------------------------
1034# Modules
1035
1036ifdef CONFIG_MODULES
1037
1038# By default, build modules as well
1039
1040all: modules
1041
1042# Build modules
1043#
1044# A module can be listed more than once in obj-m resulting in
1045# duplicate lines in modules.order files. Those are removed
1046# using awk while concatenating to the final file.
1047
1048PHONY += modules
1049modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1050 $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1051 @$(kecho) ' Building modules, stage 2.';
1052 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1053 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1054
1055modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1056 $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1057
1058%/modules.builtin: include/config/auto.conf
1059 $(Q)$(MAKE) $(modbuiltin)=$*
1060
1061
1062# Target to prepare building external modules
1063PHONY += modules_prepare
1064modules_prepare: prepare scripts
1065
1066# Target to install modules
1067PHONY += modules_install
1068modules_install: _modinst_ _modinst_post
1069
1070PHONY += _modinst_
1071_modinst_:
1072 @rm -rf $(MODLIB)/kernel
1073 @rm -f $(MODLIB)/source
1074 @mkdir -p $(MODLIB)/kernel
1075 @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1076 @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1077 rm -f $(MODLIB)/build ; \
1078 ln -s $(CURDIR) $(MODLIB)/build ; \
1079 fi
1080 @cp -f $(objtree)/modules.order $(MODLIB)/
1081 @cp -f $(objtree)/modules.builtin $(MODLIB)/
1082 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1083
1084# This depmod is only for convenience to give the initial
1085# boot a modules.dep even before / is mounted read-write. However the
1086# boot script depmod is the master version.
1087PHONY += _modinst_post
1088_modinst_post: _modinst_
1089 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1090 $(call cmd,depmod)
1091
1092ifeq ($(CONFIG_MODULE_SIG), y)
1093PHONY += modules_sign
1094modules_sign:
1095 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1096endif
1097
1098else # CONFIG_MODULES
1099
1100# Modules not configured
1101# ---------------------------------------------------------------------------
1102
1103modules modules_install: FORCE
1104 @echo >&2
1105 @echo >&2 "The present kernel configuration has modules disabled."
1106 @echo >&2 "Type 'make config' and enable loadable module support."
1107 @echo >&2 "Then build a kernel with module support enabled."
1108 @echo >&2
1109 @exit 1
1110
1111endif # CONFIG_MODULES
1112
1113###
1114# Cleaning is done on three levels.
1115# make clean Delete most generated files
1116# Leave enough to build external modules
1117# make mrproper Delete the current configuration, and all generated files
1118# make distclean Remove editor backup files, patch leftover files and the like
1119
1120# Directories & files removed with 'make clean'
1121CLEAN_DIRS += $(MODVERDIR)
1122
1123# Directories & files removed with 'make mrproper'
1124MRPROPER_DIRS += include/config usr/include include/generated \
1125 arch/*/include/generated .tmp_objdiff
1126MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1127 Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1128 signing_key.priv signing_key.x509 x509.genkey \
1129 extra_certificates signing_key.x509.keyid \
1130 signing_key.x509.signer include/linux/version.h
1131
1132# clean - Delete most, but leave enough to build external modules
1133#
1134clean: rm-dirs := $(CLEAN_DIRS)
1135clean: rm-files := $(CLEAN_FILES)
1136clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1137
1138PHONY += $(clean-dirs) clean archclean vmlinuxclean
1139$(clean-dirs):
1140 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1141
1142vmlinuxclean:
1143 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1144
1145clean: archclean vmlinuxclean
1146
1147# mrproper - Delete all generated files, including .config
1148#
1149mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1150mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1151mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1152
1153PHONY += $(mrproper-dirs) mrproper archmrproper
1154$(mrproper-dirs):
1155 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1156
1157mrproper: clean archmrproper $(mrproper-dirs)
1158 $(call cmd,rmdirs)
1159 $(call cmd,rmfiles)
1160
1161# distclean
1162#
1163PHONY += distclean
1164
1165distclean: mrproper
1166 @find $(srctree) $(RCS_FIND_IGNORE) \
1167 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1168 -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1169 -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1170 -type f -print | xargs rm -f
1171
1172
1173# Packaging of the kernel to various formats
1174# ---------------------------------------------------------------------------
1175# rpm target kept for backward compatibility
1176package-dir := $(srctree)/scripts/package
1177
1178%src-pkg: FORCE
1179 $(Q)$(MAKE) $(build)=$(package-dir) $@
1180%pkg: include/config/kernel.release FORCE
1181 $(Q)$(MAKE) $(build)=$(package-dir) $@
1182rpm: include/config/kernel.release FORCE
1183 $(Q)$(MAKE) $(build)=$(package-dir) $@
1184
1185
1186# Brief documentation of the typical targets used
1187# ---------------------------------------------------------------------------
1188
1189boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1190boards := $(notdir $(boards))
1191board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1192board-dirs := $(sort $(notdir $(board-dirs:/=)))
1193
1194help:
1195 @echo 'Cleaning targets:'
1196 @echo ' clean - Remove most generated files but keep the config and'
1197 @echo ' enough build support to build external modules'
1198 @echo ' mrproper - Remove all generated files + config + various backup files'
1199 @echo ' distclean - mrproper + remove editor backup and patch files'
1200 @echo ''
1201 @echo 'Configuration targets:'
1202 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1203 @echo ''
1204 @echo 'Other generic targets:'
1205 @echo ' all - Build all targets marked with [*]'
1206 @echo '* vmlinux - Build the bare kernel'
1207 @echo '* modules - Build all modules'
1208 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1209 @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1210 @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1211 @echo ' dir/ - Build all files in dir and below'
1212 @echo ' dir/file.[oisS] - Build specified target only'
1213 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1214 @echo ' (requires a recent binutils and recent build (System.map))'
1215 @echo ' dir/file.ko - Build module including final link'
1216 @echo ' modules_prepare - Set up for building external modules'
1217 @echo ' tags/TAGS - Generate tags file for editors'
1218 @echo ' cscope - Generate cscope index'
1219 @echo ' gtags - Generate GNU GLOBAL index'
1220 @echo ' kernelrelease - Output the release version string'
1221 @echo ' kernelversion - Output the version stored in Makefile'
1222 @echo ' image_name - Output the image name'
1223 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1224 echo ' (default: $(INSTALL_HDR_PATH))'; \
1225 echo ''
1226 @echo 'Static analysers'
1227 @echo ' checkstack - Generate a list of stack hogs'
1228 @echo ' namespacecheck - Name space analysis on compiled kernel'
1229 @echo ' versioncheck - Sanity check on version.h usage'
1230 @echo ' includecheck - Check for duplicate included header files'
1231 @echo ' export_report - List the usages of all exported symbols'
1232 @echo ' headers_check - Sanity check on exported headers'
1233 @echo ' headerdep - Detect inclusion cycles in headers'
1234 @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1235 @echo ''
1236 @echo 'Kernel packaging:'
1237 @$(MAKE) $(build)=$(package-dir) help
1238 @echo ''
1239 @echo 'Documentation targets:'
1240 @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1241 @echo ''
1242 @echo 'Architecture specific targets ($(SRCARCH)):'
1243 @$(if $(archhelp),$(archhelp),\
1244 echo ' No architecture specific help defined for $(SRCARCH)')
1245 @echo ''
1246 @$(if $(boards), \
1247 $(foreach b, $(boards), \
1248 printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1249 echo '')
1250 @$(if $(board-dirs), \
1251 $(foreach b, $(board-dirs), \
1252 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1253 printf " %-16s - Show all of the above\\n" help-boards; \
1254 echo '')
1255
1256 @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1257 @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1258 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1259 @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1260 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1261 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1262 @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1263 @echo ' 1: warnings which may be relevant and do not occur too often'
1264 @echo ' 2: warnings which occur quite often but may still be relevant'
1265 @echo ' 3: more obscure warnings, can most likely be ignored'
1266 @echo ' Multiple levels can be combined with W=12 or W=123'
1267 @echo ''
1268 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1269 @echo 'For further info see the ./README file'
1270
1271
1272help-board-dirs := $(addprefix help-,$(board-dirs))
1273
1274help-boards: $(help-board-dirs)
1275
1276boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1277
1278$(help-board-dirs): help-%:
1279 @echo 'Architecture specific targets ($(SRCARCH) $*):'
1280 @$(if $(boards-per-dir), \
1281 $(foreach b, $(boards-per-dir), \
1282 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1283 echo '')
1284
1285
1286# Documentation targets
1287# ---------------------------------------------------------------------------
1288%docs: scripts_basic FORCE
1289 $(Q)$(MAKE) $(build)=scripts build_docproc
1290 $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1291
1292else # KBUILD_EXTMOD
1293
1294###
1295# External module support.
1296# When building external modules the kernel used as basis is considered
1297# read-only, and no consistency checks are made and the make
1298# system is not used on the basis kernel. If updates are required
1299# in the basis kernel ordinary make commands (without M=...) must
1300# be used.
1301#
1302# The following are the only valid targets when building external
1303# modules.
1304# make M=dir clean Delete all automatically generated files
1305# make M=dir modules Make all modules in specified dir
1306# make M=dir Same as 'make M=dir modules'
1307# make M=dir modules_install
1308# Install the modules built in the module directory
1309# Assumes install directory is already created
1310
1311# We are always building modules
1312KBUILD_MODULES := 1
1313PHONY += crmodverdir
1314crmodverdir:
1315 $(cmd_crmodverdir)
1316
1317PHONY += $(objtree)/Module.symvers
1318$(objtree)/Module.symvers:
1319 @test -e $(objtree)/Module.symvers || ( \
1320 echo; \
1321 echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1322 echo " is missing; modules will have no dependencies and modversions."; \
1323 echo )
1324
1325module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1326PHONY += $(module-dirs) modules
1327$(module-dirs): crmodverdir $(objtree)/Module.symvers
1328 $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1329
1330modules: $(module-dirs)
1331 @$(kecho) ' Building modules, stage 2.';
1332 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1333
1334PHONY += modules_install
1335modules_install: _emodinst_ _emodinst_post
1336
1337install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1338PHONY += _emodinst_
1339_emodinst_:
1340 $(Q)mkdir -p $(MODLIB)/$(install-dir)
1341 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1342
1343PHONY += _emodinst_post
1344_emodinst_post: _emodinst_
1345 $(call cmd,depmod)
1346
1347clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1348
1349PHONY += $(clean-dirs) clean
1350$(clean-dirs):
1351 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1352
1353clean: rm-dirs := $(MODVERDIR)
1354clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1355
1356help:
1357 @echo ' Building external modules.'
1358 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1359 @echo ''
1360 @echo ' modules - default target, build the module(s)'
1361 @echo ' modules_install - install the module'
1362 @echo ' clean - remove generated files in module directory only'
1363 @echo ''
1364
1365# Dummies...
1366PHONY += prepare scripts
1367prepare: ;
1368scripts: ;
1369endif # KBUILD_EXTMOD
1370
1371clean: $(clean-dirs)
1372 $(call cmd,rmdirs)
1373 $(call cmd,rmfiles)
1374 @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1375 \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1376 -o -name '*.ko.*' \
1377 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1378 -o -name '*.symtypes' -o -name 'modules.order' \
1379 -o -name modules.builtin -o -name '.tmp_*.o.*' \
1380 -o -name '*.gcno' \) -type f -print | xargs rm -f
1381
1382# Generate tags for editors
1383# ---------------------------------------------------------------------------
1384quiet_cmd_tags = GEN $@
1385 cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1386
1387tags TAGS cscope gtags: FORCE
1388 $(call cmd,tags)
1389
1390# Scripts to check various things for consistency
1391# ---------------------------------------------------------------------------
1392
1393PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1394
1395includecheck:
1396 find $(srctree)/* $(RCS_FIND_IGNORE) \
1397 -name '*.[hcS]' -type f -print | sort \
1398 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1399
1400versioncheck:
1401 find $(srctree)/* $(RCS_FIND_IGNORE) \
1402 -name '*.[hcS]' -type f -print | sort \
1403 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1404
1405coccicheck:
1406 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1407
1408namespacecheck:
1409 $(PERL) $(srctree)/scripts/namespace.pl
1410
1411export_report:
1412 $(PERL) $(srctree)/scripts/export_report.pl
1413
1414endif #ifeq ($(config-targets),1)
1415endif #ifeq ($(mixed-targets),1)
1416
1417PHONY += checkstack kernelrelease kernelversion image_name
1418
1419# UML needs a little special treatment here. It wants to use the host
1420# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1421# else wants $(ARCH), including people doing cross-builds, which means
1422# that $(SUBARCH) doesn't work here.
1423ifeq ($(ARCH), um)
1424CHECKSTACK_ARCH := $(SUBARCH)
1425else
1426CHECKSTACK_ARCH := $(ARCH)
1427endif
1428checkstack:
1429 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1430 $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1431
1432kernelrelease:
1433 @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1434
1435kernelversion:
1436 @echo $(KERNELVERSION)
1437
1438image_name:
1439 @echo $(KBUILD_IMAGE)
1440
1441# Clear a bunch of variables before executing the submake
1442tools/: FORCE
1443 $(Q)mkdir -p $(objtree)/tools
1444 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1445
1446tools/%: FORCE
1447 $(Q)mkdir -p $(objtree)/tools
1448 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1449
1450# Single targets
1451# ---------------------------------------------------------------------------
1452# Single targets are compatible with:
1453# - build with mixed source and output
1454# - build with separate output dir 'make O=...'
1455# - external modules
1456#
1457# target-dir => where to store outputfile
1458# build-dir => directory in kernel source tree to use
1459
1460ifeq ($(KBUILD_EXTMOD),)
1461 build-dir = $(patsubst %/,%,$(dir $@))
1462 target-dir = $(dir $@)
1463else
1464 zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1465 build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1466 target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1467endif
1468
1469%.s: %.c prepare scripts FORCE
1470 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1471%.i: %.c prepare scripts FORCE
1472 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1473%.o: %.c prepare scripts FORCE
1474 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1475%.lst: %.c prepare scripts FORCE
1476 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1477%.s: %.S prepare scripts FORCE
1478 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1479%.o: %.S prepare scripts FORCE
1480 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1481%.symtypes: %.c prepare scripts FORCE
1482 $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1483
1484# Modules
1485/: prepare scripts FORCE
1486 $(cmd_crmodverdir)
1487 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1488 $(build)=$(build-dir)
1489%/: prepare scripts FORCE
1490 $(cmd_crmodverdir)
1491 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1492 $(build)=$(build-dir)
1493%.ko: prepare scripts FORCE
1494 $(cmd_crmodverdir)
1495 $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1496 $(build)=$(build-dir) $(@:.ko=.o)
1497 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1498
1499# FIXME Should go into a make.lib or something
1500# ===========================================================================
1501
1502quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1503 cmd_rmdirs = rm -rf $(rm-dirs)
1504
1505quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1506 cmd_rmfiles = rm -f $(rm-files)
1507
1508# Run depmod only if we have System.map and depmod is executable
1509quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1510 cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1511 $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1512
1513# Create temporary dir for module support files
1514# clean it up only when building all modules
1515cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1516 $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1517
1518# read all saved command lines
1519
1520targets := $(wildcard $(sort $(targets)))
1521cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1522
1523ifneq ($(cmd_files),)
1524 $(cmd_files): ; # Do not try to update included dependency files
1525 include $(cmd_files)
1526endif
1527
1528# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1529# Usage:
1530# $(Q)$(MAKE) $(clean)=dir
1531clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj
1532
1533endif # skip-makefile
1534
1535PHONY += FORCE
1536FORCE:
1537
1538# Declare the contents of the .PHONY variable as phony. We keep that
1539# information in a variable so we can use it in if_changed and friends.
1540.PHONY: $(PHONY)