Root/Makefile

1VERSION = 3
2PATCHLEVEL = 18
3SUBLEVEL = 0
4EXTRAVERSION =
5NAME = Diseased Newt
6
7# *DOCUMENTATION*
8# To see a list of typical targets execute "make help"
9# More info can be located in ./README
10# Comments in this file are targeted only to the developer, do not
11# expect to learn how to build the kernel reading this file.
12
13# Do not use make's built-in rules and variables
14# (this increases performance and avoids hard-to-debug behaviour);
15MAKEFLAGS += -rR
16
17# Avoid funny character set dependencies
18unexport LC_ALL
19LC_COLLATE=C
20LC_NUMERIC=C
21export LC_COLLATE LC_NUMERIC
22
23# Avoid interference with shell env settings
24unexport GREP_OPTIONS
25
26# We are using a recursive build, so we need to do a little thinking
27# to get the ordering right.
28#
29# Most importantly: sub-Makefiles should only ever modify files in
30# their own directory. If in some directory we have a dependency on
31# a file in another dir (which doesn't happen often, but it's often
32# unavoidable when linking the built-in.o targets which finally
33# turn into vmlinux), we will call a sub make in that other dir, and
34# after that we are sure that everything which is in that other dir
35# is now up to date.
36#
37# The only cases where we need to modify files which have global
38# effects are thus separated out and done before the recursive
39# descending is started. They are now explicitly listed as the
40# prepare rule.
41
42# Beautify output
43# ---------------------------------------------------------------------------
44#
45# Normally, we echo the whole command before executing it. By making
46# that echo $($(quiet)$(cmd)), we now have the possibility to set
47# $(quiet) to choose other forms of output instead, e.g.
48#
49# quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
50# cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
51#
52# If $(quiet) is empty, the whole command will be printed.
53# If it is set to "quiet_", only the short version will be printed.
54# If it is set to "silent_", nothing will be printed at all, since
55# the variable $(silent_cmd_cc_o_c) doesn't exist.
56#
57# A simple variant is to prefix commands with $(Q) - that's useful
58# for commands that shall be hidden in non-verbose mode.
59#
60# $(Q)ln $@ :<
61#
62# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
63# If KBUILD_VERBOSE equals 1 then the above command is displayed.
64#
65# To put more focus on warnings, be less verbose as default
66# Use 'make V=1' to see the full commands
67
68ifeq ("$(origin V)", "command line")
69  KBUILD_VERBOSE = $(V)
70endif
71ifndef KBUILD_VERBOSE
72  KBUILD_VERBOSE = 0
73endif
74
75ifeq ($(KBUILD_VERBOSE),1)
76  quiet =
77  Q =
78else
79  quiet=quiet_
80  Q = @
81endif
82
83# If the user is running make -s (silent mode), suppress echoing of
84# commands
85
86ifneq ($(filter 4.%,$(MAKE_VERSION)),) # make-4
87ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
88  quiet=silent_
89endif
90else # make-3.8x
91ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
92  quiet=silent_
93endif
94endif
95
96export quiet Q KBUILD_VERBOSE
97
98# kbuild supports saving output files in a separate directory.
99# To locate output files in a separate directory two syntaxes are supported.
100# In both cases the working directory must be the root of the kernel src.
101# 1) O=
102# Use "make O=dir/to/store/output/files/"
103#
104# 2) Set KBUILD_OUTPUT
105# Set the environment variable KBUILD_OUTPUT to point to the directory
106# where the output files shall be placed.
107# export KBUILD_OUTPUT=dir/to/store/output/files/
108# make
109#
110# The O= assignment takes precedence over the KBUILD_OUTPUT environment
111# variable.
112
113# KBUILD_SRC is set on invocation of make in OBJ directory
114# KBUILD_SRC is not intended to be used by the regular user (for now)
115ifeq ($(KBUILD_SRC),)
116
117# OK, Make called in directory where kernel src resides
118# Do we want to locate output files in a separate directory?
119ifeq ("$(origin O)", "command line")
120  KBUILD_OUTPUT := $(O)
121endif
122
123# That's our default target when none is given on the command line
124PHONY := _all
125_all:
126
127# Cancel implicit rules on top Makefile
128$(CURDIR)/Makefile Makefile: ;
129
130ifneq ($(KBUILD_OUTPUT),)
131# Invoke a second make in the output directory, passing relevant variables
132# check that the output directory actually exists
133saved-output := $(KBUILD_OUTPUT)
134KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
135                                && /bin/pwd)
136$(if $(KBUILD_OUTPUT),, \
137     $(error failed to create output directory "$(saved-output)"))
138
139PHONY += $(MAKECMDGOALS) sub-make
140
141$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
142    @:
143
144sub-make: FORCE
145    $(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
146    -f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))
147
148# Leave processing to above invocation of make
149skip-makefile := 1
150endif # ifneq ($(KBUILD_OUTPUT),)
151endif # ifeq ($(KBUILD_SRC),)
152
153# We process the rest of the Makefile if this is the final invocation of make
154ifeq ($(skip-makefile),)
155
156# Do not print "Entering directory ...",
157# but we want to display it when entering to the output directory
158# so that IDEs/editors are able to understand relative filenames.
159MAKEFLAGS += --no-print-directory
160
161# Call a source code checker (by default, "sparse") as part of the
162# C compilation.
163#
164# Use 'make C=1' to enable checking of only re-compiled files.
165# Use 'make C=2' to enable checking of *all* source files, regardless
166# of whether they are re-compiled or not.
167#
168# See the file "Documentation/sparse.txt" for more details, including
169# where to get the "sparse" utility.
170
171ifeq ("$(origin C)", "command line")
172  KBUILD_CHECKSRC = $(C)
173endif
174ifndef KBUILD_CHECKSRC
175  KBUILD_CHECKSRC = 0
176endif
177
178# Use make M=dir to specify directory of external module to build
179# Old syntax make ... SUBDIRS=$PWD is still supported
180# Setting the environment variable KBUILD_EXTMOD take precedence
181ifdef SUBDIRS
182  KBUILD_EXTMOD ?= $(SUBDIRS)
183endif
184
185ifeq ("$(origin M)", "command line")
186  KBUILD_EXTMOD := $(M)
187endif
188
189# If building an external module we do not care about the all: rule
190# but instead _all depend on modules
191PHONY += all
192ifeq ($(KBUILD_EXTMOD),)
193_all: all
194else
195_all: modules
196endif
197
198ifeq ($(KBUILD_SRC),)
199        # building in the source tree
200        srctree := .
201else
202        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
203                # building in a subdirectory of the source tree
204                srctree := ..
205        else
206                srctree := $(KBUILD_SRC)
207        endif
208endif
209objtree := .
210src := $(srctree)
211obj := $(objtree)
212
213VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))
214
215export srctree objtree VPATH
216
217
218# SUBARCH tells the usermode build what the underlying arch is. That is set
219# first, and if a usermode build is happening, the "ARCH=um" on the command
220# line overrides the setting of ARCH below. If a native build is happening,
221# then ARCH is assigned, getting whatever value it gets normally, and
222# SUBARCH is subsequently ignored.
223
224SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \
225                  -e s/sun4u/sparc64/ \
226                  -e s/arm.*/arm/ -e s/sa110/arm/ \
227                  -e s/s390x/s390/ -e s/parisc64/parisc/ \
228                  -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
229                  -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ )
230
231# Cross compiling and selecting different set of gcc/bin-utils
232# ---------------------------------------------------------------------------
233#
234# When performing cross compilation for other architectures ARCH shall be set
235# to the target architecture. (See arch/* for the possibilities).
236# ARCH can be set during invocation of make:
237# make ARCH=ia64
238# Another way is to have ARCH set in the environment.
239# The default ARCH is the host where make is executed.
240
241# CROSS_COMPILE specify the prefix used for all executables used
242# during compilation. Only gcc and related bin-utils executables
243# are prefixed with $(CROSS_COMPILE).
244# CROSS_COMPILE can be set on the command line
245# make CROSS_COMPILE=ia64-linux-
246# Alternatively CROSS_COMPILE can be set in the environment.
247# A third alternative is to store a setting in .config so that plain
248# "make" in the configured kernel build directory always uses that.
249# Default value for CROSS_COMPILE is not to prefix executables
250# Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
251ARCH ?= $(SUBARCH)
252CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
253
254# Architecture as present in compile.h
255UTS_MACHINE := $(ARCH)
256SRCARCH := $(ARCH)
257
258# Additional ARCH settings for x86
259ifeq ($(ARCH),i386)
260        SRCARCH := x86
261endif
262ifeq ($(ARCH),x86_64)
263        SRCARCH := x86
264endif
265
266# Additional ARCH settings for sparc
267ifeq ($(ARCH),sparc32)
268       SRCARCH := sparc
269endif
270ifeq ($(ARCH),sparc64)
271       SRCARCH := sparc
272endif
273
274# Additional ARCH settings for sh
275ifeq ($(ARCH),sh64)
276       SRCARCH := sh
277endif
278
279# Additional ARCH settings for tile
280ifeq ($(ARCH),tilepro)
281       SRCARCH := tile
282endif
283ifeq ($(ARCH),tilegx)
284       SRCARCH := tile
285endif
286
287# Where to locate arch specific headers
288hdr-arch := $(SRCARCH)
289
290KCONFIG_CONFIG ?= .config
291export KCONFIG_CONFIG
292
293# SHELL used by kbuild
294CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
295      else if [ -x /bin/bash ]; then echo /bin/bash; \
296      else echo sh; fi ; fi)
297
298HOSTCC = gcc
299HOSTCXX = g++
300HOSTCFLAGS = -Wall -Wmissing-prototypes -Wstrict-prototypes -O2 -fomit-frame-pointer -std=gnu89
301HOSTCXXFLAGS = -O2
302
303ifeq ($(shell $(HOSTCC) -v 2>&1 | grep -c "clang version"), 1)
304HOSTCFLAGS += -Wno-unused-value -Wno-unused-parameter \
305        -Wno-missing-field-initializers -fno-delete-null-pointer-checks
306endif
307
308# Decide whether to build built-in, modular, or both.
309# Normally, just do built-in.
310
311KBUILD_MODULES :=
312KBUILD_BUILTIN := 1
313
314# If we have only "make modules", don't compile built-in objects.
315# When we're building modules with modversions, we need to consider
316# the built-in objects during the descend as well, in order to
317# make sure the checksums are up to date before we record them.
318
319ifeq ($(MAKECMDGOALS),modules)
320  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
321endif
322
323# If we have "make <whatever> modules", compile modules
324# in addition to whatever we do anyway.
325# Just "make" or "make all" shall build modules as well
326
327ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
328  KBUILD_MODULES := 1
329endif
330
331ifeq ($(MAKECMDGOALS),)
332  KBUILD_MODULES := 1
333endif
334
335export KBUILD_MODULES KBUILD_BUILTIN
336export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD
337
338ifneq ($(CC),)
339ifeq ($(shell $(CC) -v 2>&1 | grep -c "clang version"), 1)
340COMPILER := clang
341else
342COMPILER := gcc
343endif
344export COMPILER
345endif
346
347# Look for make include files relative to root of kernel src
348MAKEFLAGS += --include-dir=$(srctree)
349
350# We need some generic definitions (do not try to remake the file).
351$(srctree)/scripts/Kbuild.include: ;
352include $(srctree)/scripts/Kbuild.include
353
354# Make variables (CC, etc...)
355AS = $(CROSS_COMPILE)as
356LD = $(CROSS_COMPILE)ld
357CC = $(CROSS_COMPILE)gcc
358CPP = $(CC) -E
359AR = $(CROSS_COMPILE)ar
360NM = $(CROSS_COMPILE)nm
361STRIP = $(CROSS_COMPILE)strip
362OBJCOPY = $(CROSS_COMPILE)objcopy
363OBJDUMP = $(CROSS_COMPILE)objdump
364AWK = awk
365GENKSYMS = scripts/genksyms/genksyms
366INSTALLKERNEL := installkernel
367DEPMOD = /sbin/depmod
368PERL = perl
369PYTHON = python
370CHECK = sparse
371
372CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
373          -Wbitwise -Wno-return-void $(CF)
374CFLAGS_MODULE =
375AFLAGS_MODULE =
376LDFLAGS_MODULE =
377CFLAGS_KERNEL =
378AFLAGS_KERNEL =
379CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
380
381
382# Use USERINCLUDE when you must reference the UAPI directories only.
383USERINCLUDE := \
384        -I$(srctree)/arch/$(hdr-arch)/include/uapi \
385        -Iarch/$(hdr-arch)/include/generated/uapi \
386        -I$(srctree)/include/uapi \
387        -Iinclude/generated/uapi \
388                -include $(srctree)/include/linux/kconfig.h
389
390# Use LINUXINCLUDE when you must reference the include/ directory.
391# Needed to be compatible with the O= option
392LINUXINCLUDE := \
393        -I$(srctree)/arch/$(hdr-arch)/include \
394        -Iarch/$(hdr-arch)/include/generated \
395        $(if $(KBUILD_SRC), -I$(srctree)/include) \
396        -Iinclude \
397        $(USERINCLUDE)
398
399KBUILD_CPPFLAGS := -D__KERNEL__
400
401KBUILD_CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
402           -fno-strict-aliasing -fno-common \
403           -Werror-implicit-function-declaration \
404           -Wno-format-security \
405           -std=gnu89
406
407KBUILD_AFLAGS_KERNEL :=
408KBUILD_CFLAGS_KERNEL :=
409KBUILD_AFLAGS := -D__ASSEMBLY__
410KBUILD_AFLAGS_MODULE := -DMODULE
411KBUILD_CFLAGS_MODULE := -DMODULE
412KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds
413
414# Read KERNELRELEASE from include/config/kernel.release (if it exists)
415KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null)
416KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
417
418export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
419export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC
420export CPP AR NM STRIP OBJCOPY OBJDUMP
421export MAKE AWK GENKSYMS INSTALLKERNEL PERL PYTHON UTS_MACHINE
422export HOSTCXX HOSTCXXFLAGS LDFLAGS_MODULE CHECK CHECKFLAGS
423
424export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS
425export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE CFLAGS_GCOV
426export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
427export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
428export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
429export KBUILD_ARFLAGS
430
431# When compiling out-of-tree modules, put MODVERDIR in the module
432# tree rather than in the kernel tree. The kernel tree might
433# even be read-only.
434export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions
435
436# Files to ignore in find ... statements
437
438export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
439              -name CVS -o -name .pc -o -name .hg -o -name .git \) \
440              -prune -o
441export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
442             --exclude CVS --exclude .pc --exclude .hg --exclude .git
443
444# ===========================================================================
445# Rules shared between *config targets and build targets
446
447# Basic helpers built in scripts/
448PHONY += scripts_basic
449scripts_basic:
450    $(Q)$(MAKE) $(build)=scripts/basic
451    $(Q)rm -f .tmp_quiet_recordmcount
452
453# To avoid any implicit rule to kick in, define an empty command.
454scripts/basic/%: scripts_basic ;
455
456PHONY += outputmakefile
457# outputmakefile generates a Makefile in the output directory, if using a
458# separate output directory. This allows convenient use of make in the
459# output directory.
460outputmakefile:
461ifneq ($(KBUILD_SRC),)
462    $(Q)ln -fsn $(srctree) source
463    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
464        $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
465endif
466
467# Support for using generic headers in asm-generic
468PHONY += asm-generic
469asm-generic:
470    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
471                src=asm obj=arch/$(SRCARCH)/include/generated/asm
472    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.asm-generic \
473                src=uapi/asm obj=arch/$(SRCARCH)/include/generated/uapi/asm
474
475# To make sure we do not include .config for any of the *config targets
476# catch them early, and hand them over to scripts/kconfig/Makefile
477# It is allowed to specify more targets when calling make, including
478# mixing *config targets and build targets.
479# For example 'make oldconfig all'.
480# Detect when mixed targets is specified, and make a second invocation
481# of make so .config is not included in this case either (for *config).
482
483version_h := include/generated/uapi/linux/version.h
484
485no-dot-config-targets := clean mrproper distclean \
486             cscope gtags TAGS tags help %docs check% coccicheck \
487             $(version_h) headers_% archheaders archscripts \
488             kernelversion %src-pkg
489
490config-targets := 0
491mixed-targets := 0
492dot-config := 1
493
494ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
495    ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
496        dot-config := 0
497    endif
498endif
499
500ifeq ($(KBUILD_EXTMOD),)
501        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
502                config-targets := 1
503                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
504                        mixed-targets := 1
505                endif
506        endif
507endif
508
509ifeq ($(mixed-targets),1)
510# ===========================================================================
511# We're called with mixed targets (*config and build targets).
512# Handle them one by one.
513
514PHONY += $(MAKECMDGOALS) __build_one_by_one
515
516$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
517    @:
518
519__build_one_by_one:
520    $(Q)set -e; \
521    for i in $(MAKECMDGOALS); do \
522        $(MAKE) -f $(srctree)/Makefile $$i; \
523    done
524
525else
526ifeq ($(config-targets),1)
527# ===========================================================================
528# *config targets only - make sure prerequisites are updated, and descend
529# in scripts/kconfig to make the *config target
530
531# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
532# KBUILD_DEFCONFIG may point out an alternative default configuration
533# used for 'make defconfig'
534include $(srctree)/arch/$(SRCARCH)/Makefile
535export KBUILD_DEFCONFIG KBUILD_KCONFIG
536
537config: scripts_basic outputmakefile FORCE
538    $(Q)$(MAKE) $(build)=scripts/kconfig $@
539
540%config: scripts_basic outputmakefile FORCE
541    $(Q)$(MAKE) $(build)=scripts/kconfig $@
542
543else
544# ===========================================================================
545# Build targets only - this includes vmlinux, arch specific targets, clean
546# targets and others. In general all targets except *config targets.
547
548ifeq ($(KBUILD_EXTMOD),)
549# Additional helpers built in scripts/
550# Carefully list dependencies so we do not try to build scripts twice
551# in parallel
552PHONY += scripts
553scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
554     asm-generic
555    $(Q)$(MAKE) $(build)=$(@)
556
557# Objects we will link into vmlinux / subdirs we need to visit
558init-y := init/
559drivers-y := drivers/ sound/ firmware/
560net-y := net/
561libs-y := lib/
562core-y := usr/
563endif # KBUILD_EXTMOD
564
565ifeq ($(dot-config),1)
566# Read in config
567-include include/config/auto.conf
568
569ifeq ($(KBUILD_EXTMOD),)
570# Read in dependencies to all Kconfig* files, make sure to run
571# oldconfig if changes are detected.
572-include include/config/auto.conf.cmd
573
574# To avoid any implicit rule to kick in, define an empty command
575$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
576
577# If .config is newer than include/config/auto.conf, someone tinkered
578# with it and forgot to run make oldconfig.
579# if auto.conf.cmd is missing then we are probably in a cleaned tree so
580# we execute the config step to be sure to catch updated Kconfig files
581include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
582    $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
583else
584# external modules needs include/generated/autoconf.h and include/config/auto.conf
585# but do not care if they are up-to-date. Use auto.conf to trigger the test
586PHONY += include/config/auto.conf
587
588include/config/auto.conf:
589    $(Q)test -e include/generated/autoconf.h -a -e $@ || ( \
590    echo >&2; \
591    echo >&2 " ERROR: Kernel configuration is invalid."; \
592    echo >&2 " include/generated/autoconf.h or $@ are missing.";\
593    echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
594    echo >&2 ; \
595    /bin/false)
596
597endif # KBUILD_EXTMOD
598
599else
600# Dummy target needed, because used as prerequisite
601include/config/auto.conf: ;
602endif # $(dot-config)
603
604# The all: target is the default when no target is given on the
605# command line.
606# This allow a user to issue only 'make' to build a kernel including modules
607# Defaults to vmlinux, but the arch makefile usually adds further targets
608all: vmlinux
609
610include $(srctree)/arch/$(SRCARCH)/Makefile
611
612KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks,)
613
614ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
615KBUILD_CFLAGS += -Os $(call cc-disable-warning,maybe-uninitialized,)
616else
617KBUILD_CFLAGS += -O2
618endif
619
620# Tell gcc to never replace conditional load with a non-conditional one
621KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
622
623ifdef CONFIG_READABLE_ASM
624# Disable optimizations that make assembler listings hard to read.
625# reorder blocks reorders the control in the function
626# ipa clone creates specialized cloned functions
627# partial inlining inlines only parts of functions
628KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
629                 $(call cc-option,-fno-ipa-cp-clone,) \
630                 $(call cc-option,-fno-partial-inlining)
631endif
632
633ifneq ($(CONFIG_FRAME_WARN),0)
634KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
635endif
636
637# Handle stack protector mode.
638#
639# Since kbuild can potentially perform two passes (first with the old
640# .config values and then with updated .config values), we cannot error out
641# if a desired compiler option is unsupported. If we were to error, kbuild
642# could never get to the second pass and actually notice that we changed
643# the option to something that was supported.
644#
645# Additionally, we don't want to fallback and/or silently change which compiler
646# flags will be used, since that leads to producing kernels with different
647# security feature characteristics depending on the compiler used. ("But I
648# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
649#
650# The middle ground is to warn here so that the failed option is obvious, but
651# to let the build fail with bad compiler flags so that we can't produce a
652# kernel when there is a CONFIG and compiler mismatch.
653#
654ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
655  stackp-flag := -fstack-protector
656  ifeq ($(call cc-option, $(stackp-flag)),)
657    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
658             -fstack-protector not supported by compiler)
659  endif
660else
661ifdef CONFIG_CC_STACKPROTECTOR_STRONG
662  stackp-flag := -fstack-protector-strong
663  ifeq ($(call cc-option, $(stackp-flag)),)
664    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
665          -fstack-protector-strong not supported by compiler)
666  endif
667else
668  # Force off for distro compilers that enable stack protector by default.
669  stackp-flag := $(call cc-option, -fno-stack-protector)
670endif
671endif
672KBUILD_CFLAGS += $(stackp-flag)
673
674ifeq ($(COMPILER),clang)
675KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
676KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
677KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
678KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
679KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
680# Quiet clang warning: comparison of unsigned expression < 0 is always false
681KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
682# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
683# source of a reference will be _MergedGlobals and not on of the whitelisted names.
684# See modpost pattern 2
685KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
686KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
687else
688
689# This warning generated too much noise in a regular build.
690# Use make W=1 to enable this warning (see scripts/Makefile.build)
691KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
692endif
693
694ifdef CONFIG_FRAME_POINTER
695KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
696else
697# Some targets (ARM with Thumb2, for example), can't be built with frame
698# pointers. For those, we don't have FUNCTION_TRACER automatically
699# select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
700# incompatible with -fomit-frame-pointer with current GCC, so we don't use
701# -fomit-frame-pointer with FUNCTION_TRACER.
702ifndef CONFIG_FUNCTION_TRACER
703KBUILD_CFLAGS += -fomit-frame-pointer
704endif
705endif
706
707KBUILD_CFLAGS += $(call cc-option, -fno-var-tracking-assignments)
708
709ifdef CONFIG_DEBUG_INFO
710ifdef CONFIG_DEBUG_INFO_SPLIT
711KBUILD_CFLAGS += $(call cc-option, -gsplit-dwarf, -g)
712else
713KBUILD_CFLAGS += -g
714endif
715KBUILD_AFLAGS += -Wa,-gdwarf-2
716endif
717ifdef CONFIG_DEBUG_INFO_DWARF4
718KBUILD_CFLAGS += $(call cc-option, -gdwarf-4,)
719endif
720
721ifdef CONFIG_DEBUG_INFO_REDUCED
722KBUILD_CFLAGS += $(call cc-option, -femit-struct-debug-baseonly) \
723           $(call cc-option,-fno-var-tracking)
724endif
725
726ifdef CONFIG_FUNCTION_TRACER
727ifdef CONFIG_HAVE_FENTRY
728CC_USING_FENTRY := $(call cc-option, -mfentry -DCC_USING_FENTRY)
729endif
730KBUILD_CFLAGS += -pg $(CC_USING_FENTRY)
731KBUILD_AFLAGS += $(CC_USING_FENTRY)
732ifdef CONFIG_DYNAMIC_FTRACE
733    ifdef CONFIG_HAVE_C_RECORDMCOUNT
734        BUILD_C_RECORDMCOUNT := y
735        export BUILD_C_RECORDMCOUNT
736    endif
737endif
738endif
739
740# We trigger additional mismatches with less inlining
741ifdef CONFIG_DEBUG_SECTION_MISMATCH
742KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
743endif
744
745# arch Makefile may override CC so keep this after arch Makefile is included
746NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
747CHECKFLAGS += $(NOSTDINC_FLAGS)
748
749# warn about C99 declaration after statement
750KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
751
752# disable pointer signed / unsigned warnings in gcc 4.0
753KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
754
755# disable invalid "can't wrap" optimizations for signed / pointers
756KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow)
757
758# conserve stack if available
759KBUILD_CFLAGS += $(call cc-option,-fconserve-stack)
760
761# disallow errors like 'EXPORT_GPL(foo);' with missing header
762KBUILD_CFLAGS += $(call cc-option,-Werror=implicit-int)
763
764# require functions to have arguments in prototypes, not empty 'int foo()'
765KBUILD_CFLAGS += $(call cc-option,-Werror=strict-prototypes)
766
767# Prohibit date/time macros, which would make the build non-deterministic
768KBUILD_CFLAGS += $(call cc-option,-Werror=date-time)
769
770# use the deterministic mode of AR if available
771KBUILD_ARFLAGS := $(call ar-option,D)
772
773# check for 'asm goto'
774ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
775    KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
776endif
777
778include $(srctree)/scripts/Makefile.extrawarn
779
780# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
781KBUILD_CPPFLAGS += $(KCPPFLAGS)
782KBUILD_AFLAGS += $(KAFLAGS)
783KBUILD_CFLAGS += $(KCFLAGS)
784
785# Use --build-id when available.
786LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
787                  $(call cc-ldoption, -Wl$(comma)--build-id,))
788KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
789LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
790
791ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
792LDFLAGS_vmlinux += $(call ld-option, -X,)
793endif
794
795# Default kernel image to build when no specific target is given.
796# KBUILD_IMAGE may be overruled on the command line or
797# set in the environment
798# Also any assignments in arch/$(ARCH)/Makefile take precedence over
799# this default value
800export KBUILD_IMAGE ?= vmlinux
801
802#
803# INSTALL_PATH specifies where to place the updated kernel and system map
804# images. Default is /boot, but you can set it to other values
805export INSTALL_PATH ?= /boot
806
807#
808# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
809# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
810# an argument if needed. Otherwise it defaults to the kernel install path
811#
812export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
813
814#
815# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
816# relocations required by build roots. This is not defined in the
817# makefile but the argument can be passed to make if needed.
818#
819
820MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
821export MODLIB
822
823#
824# INSTALL_MOD_STRIP, if defined, will cause modules to be
825# stripped after they are installed. If INSTALL_MOD_STRIP is '1', then
826# the default option --strip-debug will be used. Otherwise,
827# INSTALL_MOD_STRIP value will be used as the options to the strip command.
828
829ifdef INSTALL_MOD_STRIP
830ifeq ($(INSTALL_MOD_STRIP),1)
831mod_strip_cmd = $(STRIP) --strip-debug
832else
833mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
834endif # INSTALL_MOD_STRIP=1
835else
836mod_strip_cmd = true
837endif # INSTALL_MOD_STRIP
838export mod_strip_cmd
839
840# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
841# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
842# or CONFIG_MODULE_COMPRESS_XZ.
843
844mod_compress_cmd = true
845ifdef CONFIG_MODULE_COMPRESS
846  ifdef CONFIG_MODULE_COMPRESS_GZIP
847    mod_compress_cmd = gzip -n
848  endif # CONFIG_MODULE_COMPRESS_GZIP
849  ifdef CONFIG_MODULE_COMPRESS_XZ
850    mod_compress_cmd = xz
851  endif # CONFIG_MODULE_COMPRESS_XZ
852endif # CONFIG_MODULE_COMPRESS
853export mod_compress_cmd
854
855# Select initial ramdisk compression format, default is gzip(1).
856# This shall be used by the dracut(8) tool while creating an initramfs image.
857#
858INITRD_COMPRESS-y := gzip
859INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
860INITRD_COMPRESS-$(CONFIG_RD_LZMA) := lzma
861INITRD_COMPRESS-$(CONFIG_RD_XZ) := xz
862INITRD_COMPRESS-$(CONFIG_RD_LZO) := lzo
863INITRD_COMPRESS-$(CONFIG_RD_LZ4) := lz4
864# do not export INITRD_COMPRESS, since we didn't actually
865# choose a sane default compression above.
866# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
867
868ifdef CONFIG_MODULE_SIG_ALL
869MODSECKEY = ./signing_key.priv
870MODPUBKEY = ./signing_key.x509
871export MODPUBKEY
872mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
873else
874mod_sign_cmd = true
875endif
876export mod_sign_cmd
877
878
879ifeq ($(KBUILD_EXTMOD),)
880core-y += kernel/ mm/ fs/ ipc/ security/ crypto/ block/
881
882vmlinux-dirs := $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
883             $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
884             $(net-y) $(net-m) $(libs-y) $(libs-m)))
885
886vmlinux-alldirs := $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
887             $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
888
889init-y := $(patsubst %/, %/built-in.o, $(init-y))
890core-y := $(patsubst %/, %/built-in.o, $(core-y))
891drivers-y := $(patsubst %/, %/built-in.o, $(drivers-y))
892net-y := $(patsubst %/, %/built-in.o, $(net-y))
893libs-y1 := $(patsubst %/, %/lib.a, $(libs-y))
894libs-y2 := $(patsubst %/, %/built-in.o, $(libs-y))
895libs-y := $(libs-y1) $(libs-y2)
896
897# Externally visible symbols (used by link-vmlinux.sh)
898export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
899export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
900export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
901export LDFLAGS_vmlinux
902# used by scripts/pacmage/Makefile
903export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
904
905vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
906
907# Final link of vmlinux
908      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
909quiet_cmd_link-vmlinux = LINK $@
910
911# Include targets which we want to
912# execute if the rest of the kernel build went well.
913vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
914ifdef CONFIG_HEADERS_CHECK
915    $(Q)$(MAKE) -f $(srctree)/Makefile headers_check
916endif
917ifdef CONFIG_SAMPLES
918    $(Q)$(MAKE) $(build)=samples
919endif
920ifdef CONFIG_BUILD_DOCSRC
921    $(Q)$(MAKE) $(build)=Documentation
922endif
923    +$(call if_changed,link-vmlinux)
924
925# The actual objects are generated when descending,
926# make sure no implicit rule kicks in
927$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
928
929# Handle descending into subdirectories listed in $(vmlinux-dirs)
930# Preset locale variables to speed up the build process. Limit locale
931# tweaks to this spot to avoid wrong language settings when running
932# make menuconfig etc.
933# Error messages still appears in the original language
934
935PHONY += $(vmlinux-dirs)
936$(vmlinux-dirs): prepare scripts
937    $(Q)$(MAKE) $(build)=$@
938
939define filechk_kernel.release
940    echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
941endef
942
943# Store (new) KERNELRELEASE string in include/config/kernel.release
944include/config/kernel.release: include/config/auto.conf FORCE
945    $(call filechk,kernel.release)
946
947
948# Things we need to do before we recursively start building the kernel
949# or the modules are listed in "prepare".
950# A multi level approach is used. prepareN is processed before prepareN-1.
951# archprepare is used in arch Makefiles and when processed asm symlink,
952# version.h and scripts_basic is processed / created.
953
954# Listed in dependency order
955PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
956
957# prepare3 is used to check if we are building in a separate output directory,
958# and if so do:
959# 1) Check that make has not been executed in the kernel src $(srctree)
960prepare3: include/config/kernel.release
961ifneq ($(KBUILD_SRC),)
962    @$(kecho) ' Using $(srctree) as source for kernel'
963    $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
964        echo >&2 " $(srctree) is not clean, please run 'make mrproper'"; \
965        echo >&2 " in the '$(srctree)' directory.";\
966        /bin/false; \
967    fi;
968endif
969
970# prepare2 creates a makefile if using a separate output directory
971prepare2: prepare3 outputmakefile asm-generic
972
973prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
974                   include/config/auto.conf
975    $(cmd_crmodverdir)
976
977archprepare: archheaders archscripts prepare1 scripts_basic
978
979prepare0: archprepare FORCE
980    $(Q)$(MAKE) $(build)=.
981
982# All the preparing..
983prepare: prepare0
984
985# Generate some files
986# ---------------------------------------------------------------------------
987
988# KERNELRELEASE can change from a few different places, meaning version.h
989# needs to be updated, so this check is forced on all builds
990
991uts_len := 64
992define filechk_utsrelease.h
993    if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
994      echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
995      exit 1; \
996    fi; \
997    (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
998endef
999
1000define filechk_version.h
1001    (echo \#define LINUX_VERSION_CODE $(shell \
1002    expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1003    echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1004endef
1005
1006$(version_h): $(srctree)/Makefile FORCE
1007    $(call filechk,version.h)
1008
1009include/generated/utsrelease.h: include/config/kernel.release FORCE
1010    $(call filechk,utsrelease.h)
1011
1012PHONY += headerdep
1013headerdep:
1014    $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1015    $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1016
1017# ---------------------------------------------------------------------------
1018
1019PHONY += depend dep
1020depend dep:
1021    @echo '*** Warning: make $@ is unnecessary now.'
1022
1023# ---------------------------------------------------------------------------
1024# Firmware install
1025INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1026export INSTALL_FW_PATH
1027
1028PHONY += firmware_install
1029firmware_install: FORCE
1030    @mkdir -p $(objtree)/firmware
1031    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1032
1033# ---------------------------------------------------------------------------
1034# Kernel headers
1035
1036#Default location for installed headers
1037export INSTALL_HDR_PATH = $(objtree)/usr
1038
1039hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
1040
1041# If we do an all arch process set dst to asm-$(hdr-arch)
1042hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1043
1044PHONY += archheaders
1045archheaders:
1046
1047PHONY += archscripts
1048archscripts:
1049
1050PHONY += __headers
1051__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1052    $(Q)$(MAKE) $(build)=scripts build_unifdef
1053
1054PHONY += headers_install_all
1055headers_install_all:
1056    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1057
1058PHONY += headers_install
1059headers_install: __headers
1060    $(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1061      $(error Headers not exportable for the $(SRCARCH) architecture))
1062    $(Q)$(MAKE) $(hdr-inst)=include/uapi
1063    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1064
1065PHONY += headers_check_all
1066headers_check_all: headers_install_all
1067    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1068
1069PHONY += headers_check
1070headers_check: headers_install
1071    $(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1072    $(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1073
1074# ---------------------------------------------------------------------------
1075# Kernel selftest
1076
1077PHONY += kselftest
1078kselftest:
1079    $(Q)$(MAKE) -C tools/testing/selftests run_tests
1080
1081# ---------------------------------------------------------------------------
1082# Modules
1083
1084ifdef CONFIG_MODULES
1085
1086# By default, build modules as well
1087
1088all: modules
1089
1090# Build modules
1091#
1092# A module can be listed more than once in obj-m resulting in
1093# duplicate lines in modules.order files. Those are removed
1094# using awk while concatenating to the final file.
1095
1096PHONY += modules
1097modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1098    $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1099    @$(kecho) ' Building modules, stage 2.';
1100    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1101    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1102
1103modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1104    $(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1105
1106%/modules.builtin: include/config/auto.conf
1107    $(Q)$(MAKE) $(modbuiltin)=$*
1108
1109
1110# Target to prepare building external modules
1111PHONY += modules_prepare
1112modules_prepare: prepare scripts
1113
1114# Target to install modules
1115PHONY += modules_install
1116modules_install: _modinst_ _modinst_post
1117
1118PHONY += _modinst_
1119_modinst_:
1120    @rm -rf $(MODLIB)/kernel
1121    @rm -f $(MODLIB)/source
1122    @mkdir -p $(MODLIB)/kernel
1123    @ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1124    @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \
1125        rm -f $(MODLIB)/build ; \
1126        ln -s $(CURDIR) $(MODLIB)/build ; \
1127    fi
1128    @cp -f $(objtree)/modules.order $(MODLIB)/
1129    @cp -f $(objtree)/modules.builtin $(MODLIB)/
1130    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1131
1132# This depmod is only for convenience to give the initial
1133# boot a modules.dep even before / is mounted read-write. However the
1134# boot script depmod is the master version.
1135PHONY += _modinst_post
1136_modinst_post: _modinst_
1137    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1138    $(call cmd,depmod)
1139
1140ifeq ($(CONFIG_MODULE_SIG), y)
1141PHONY += modules_sign
1142modules_sign:
1143    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1144endif
1145
1146else # CONFIG_MODULES
1147
1148# Modules not configured
1149# ---------------------------------------------------------------------------
1150
1151modules modules_install: FORCE
1152    @echo >&2
1153    @echo >&2 "The present kernel configuration has modules disabled."
1154    @echo >&2 "Type 'make config' and enable loadable module support."
1155    @echo >&2 "Then build a kernel with module support enabled."
1156    @echo >&2
1157    @exit 1
1158
1159endif # CONFIG_MODULES
1160
1161###
1162# Cleaning is done on three levels.
1163# make clean Delete most generated files
1164# Leave enough to build external modules
1165# make mrproper Delete the current configuration, and all generated files
1166# make distclean Remove editor backup files, patch leftover files and the like
1167
1168# Directories & files removed with 'make clean'
1169CLEAN_DIRS += $(MODVERDIR)
1170
1171# Directories & files removed with 'make mrproper'
1172MRPROPER_DIRS += include/config usr/include include/generated \
1173          arch/*/include/generated .tmp_objdiff
1174MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1175          Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1176          signing_key.priv signing_key.x509 x509.genkey \
1177          extra_certificates signing_key.x509.keyid \
1178          signing_key.x509.signer include/linux/version.h
1179
1180# clean - Delete most, but leave enough to build external modules
1181#
1182clean: rm-dirs := $(CLEAN_DIRS)
1183clean: rm-files := $(CLEAN_FILES)
1184clean-dirs := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1185
1186PHONY += $(clean-dirs) clean archclean vmlinuxclean
1187$(clean-dirs):
1188    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1189
1190vmlinuxclean:
1191    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1192
1193clean: archclean vmlinuxclean
1194
1195# mrproper - Delete all generated files, including .config
1196#
1197mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS))
1198mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1199mrproper-dirs := $(addprefix _mrproper_,Documentation/DocBook scripts)
1200
1201PHONY += $(mrproper-dirs) mrproper archmrproper
1202$(mrproper-dirs):
1203    $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1204
1205mrproper: clean archmrproper $(mrproper-dirs)
1206    $(call cmd,rmdirs)
1207    $(call cmd,rmfiles)
1208
1209# distclean
1210#
1211PHONY += distclean
1212
1213distclean: mrproper
1214    @find $(srctree) $(RCS_FIND_IGNORE) \
1215        \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1216        -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1217        -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
1218        -type f -print | xargs rm -f
1219
1220
1221# Packaging of the kernel to various formats
1222# ---------------------------------------------------------------------------
1223# rpm target kept for backward compatibility
1224package-dir := scripts/package
1225
1226%src-pkg: FORCE
1227    $(Q)$(MAKE) $(build)=$(package-dir) $@
1228%pkg: include/config/kernel.release FORCE
1229    $(Q)$(MAKE) $(build)=$(package-dir) $@
1230rpm: include/config/kernel.release FORCE
1231    $(Q)$(MAKE) $(build)=$(package-dir) $@
1232
1233
1234# Brief documentation of the typical targets used
1235# ---------------------------------------------------------------------------
1236
1237boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1238boards := $(notdir $(boards))
1239board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1240board-dirs := $(sort $(notdir $(board-dirs:/=)))
1241
1242help:
1243    @echo 'Cleaning targets:'
1244    @echo ' clean - Remove most generated files but keep the config and'
1245    @echo ' enough build support to build external modules'
1246    @echo ' mrproper - Remove all generated files + config + various backup files'
1247    @echo ' distclean - mrproper + remove editor backup and patch files'
1248    @echo ''
1249    @echo 'Configuration targets:'
1250    @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1251    @echo ''
1252    @echo 'Other generic targets:'
1253    @echo ' all - Build all targets marked with [*]'
1254    @echo '* vmlinux - Build the bare kernel'
1255    @echo '* modules - Build all modules'
1256    @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1257    @echo ' firmware_install- Install all firmware to INSTALL_FW_PATH'
1258    @echo ' (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1259    @echo ' dir/ - Build all files in dir and below'
1260    @echo ' dir/file.[oisS] - Build specified target only'
1261    @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1262    @echo ' (requires a recent binutils and recent build (System.map))'
1263    @echo ' dir/file.ko - Build module including final link'
1264    @echo ' modules_prepare - Set up for building external modules'
1265    @echo ' tags/TAGS - Generate tags file for editors'
1266    @echo ' cscope - Generate cscope index'
1267    @echo ' gtags - Generate GNU GLOBAL index'
1268    @echo ' kernelrelease - Output the release version string (use with make -s)'
1269    @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1270    @echo ' image_name - Output the image name (use with make -s)'
1271    @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1272     echo ' (default: $(INSTALL_HDR_PATH))'; \
1273     echo ''
1274    @echo 'Static analysers'
1275    @echo ' checkstack - Generate a list of stack hogs'
1276    @echo ' namespacecheck - Name space analysis on compiled kernel'
1277    @echo ' versioncheck - Sanity check on version.h usage'
1278    @echo ' includecheck - Check for duplicate included header files'
1279    @echo ' export_report - List the usages of all exported symbols'
1280    @echo ' headers_check - Sanity check on exported headers'
1281    @echo ' headerdep - Detect inclusion cycles in headers'
1282    @$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1283    @echo ''
1284    @echo 'Kernel selftest'
1285    @echo ' kselftest - Build and run kernel selftest (run as root)'
1286    @echo ' Build, install, and boot kernel before'
1287    @echo ' running kselftest on it'
1288    @echo ''
1289    @echo 'Kernel packaging:'
1290    @$(MAKE) $(build)=$(package-dir) help
1291    @echo ''
1292    @echo 'Documentation targets:'
1293    @$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1294    @echo ''
1295    @echo 'Architecture specific targets ($(SRCARCH)):'
1296    @$(if $(archhelp),$(archhelp),\
1297        echo ' No architecture specific help defined for $(SRCARCH)')
1298    @echo ''
1299    @$(if $(boards), \
1300        $(foreach b, $(boards), \
1301        printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1302        echo '')
1303    @$(if $(board-dirs), \
1304        $(foreach b, $(board-dirs), \
1305        printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1306        printf " %-16s - Show all of the above\\n" help-boards; \
1307        echo '')
1308
1309    @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1310    @echo ' make V=2 [targets] 2 => give reason for rebuild of target'
1311    @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1312    @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)'
1313    @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1314    @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1315    @echo ' make W=n [targets] Enable extra gcc checks, n=1,2,3 where'
1316    @echo ' 1: warnings which may be relevant and do not occur too often'
1317    @echo ' 2: warnings which occur quite often but may still be relevant'
1318    @echo ' 3: more obscure warnings, can most likely be ignored'
1319    @echo ' Multiple levels can be combined with W=12 or W=123'
1320    @echo ''
1321    @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1322    @echo 'For further info see the ./README file'
1323
1324
1325help-board-dirs := $(addprefix help-,$(board-dirs))
1326
1327help-boards: $(help-board-dirs)
1328
1329boards-per-dir = $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig))
1330
1331$(help-board-dirs): help-%:
1332    @echo 'Architecture specific targets ($(SRCARCH) $*):'
1333    @$(if $(boards-per-dir), \
1334        $(foreach b, $(boards-per-dir), \
1335        printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1336        echo '')
1337
1338
1339# Documentation targets
1340# ---------------------------------------------------------------------------
1341%docs: scripts_basic FORCE
1342    $(Q)$(MAKE) $(build)=scripts build_docproc
1343    $(Q)$(MAKE) $(build)=Documentation/DocBook $@
1344
1345else # KBUILD_EXTMOD
1346
1347###
1348# External module support.
1349# When building external modules the kernel used as basis is considered
1350# read-only, and no consistency checks are made and the make
1351# system is not used on the basis kernel. If updates are required
1352# in the basis kernel ordinary make commands (without M=...) must
1353# be used.
1354#
1355# The following are the only valid targets when building external
1356# modules.
1357# make M=dir clean Delete all automatically generated files
1358# make M=dir modules Make all modules in specified dir
1359# make M=dir Same as 'make M=dir modules'
1360# make M=dir modules_install
1361# Install the modules built in the module directory
1362# Assumes install directory is already created
1363
1364# We are always building modules
1365KBUILD_MODULES := 1
1366PHONY += crmodverdir
1367crmodverdir:
1368    $(cmd_crmodverdir)
1369
1370PHONY += $(objtree)/Module.symvers
1371$(objtree)/Module.symvers:
1372    @test -e $(objtree)/Module.symvers || ( \
1373    echo; \
1374    echo " WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1375    echo " is missing; modules will have no dependencies and modversions."; \
1376    echo )
1377
1378module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1379PHONY += $(module-dirs) modules
1380$(module-dirs): crmodverdir $(objtree)/Module.symvers
1381    $(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1382
1383modules: $(module-dirs)
1384    @$(kecho) ' Building modules, stage 2.';
1385    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1386
1387PHONY += modules_install
1388modules_install: _emodinst_ _emodinst_post
1389
1390install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1391PHONY += _emodinst_
1392_emodinst_:
1393    $(Q)mkdir -p $(MODLIB)/$(install-dir)
1394    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1395
1396PHONY += _emodinst_post
1397_emodinst_post: _emodinst_
1398    $(call cmd,depmod)
1399
1400clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1401
1402PHONY += $(clean-dirs) clean
1403$(clean-dirs):
1404    $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1405
1406clean: rm-dirs := $(MODVERDIR)
1407clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1408
1409help:
1410    @echo ' Building external modules.'
1411    @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1412    @echo ''
1413    @echo ' modules - default target, build the module(s)'
1414    @echo ' modules_install - install the module'
1415    @echo ' clean - remove generated files in module directory only'
1416    @echo ''
1417
1418# Dummies...
1419PHONY += prepare scripts
1420prepare: ;
1421scripts: ;
1422endif # KBUILD_EXTMOD
1423
1424clean: $(clean-dirs)
1425    $(call cmd,rmdirs)
1426    $(call cmd,rmfiles)
1427    @find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1428        \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1429        -o -name '*.ko.*' \
1430        -o -name '*.dwo' \
1431        -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1432        -o -name '*.symtypes' -o -name 'modules.order' \
1433        -o -name modules.builtin -o -name '.tmp_*.o.*' \
1434        -o -name '*.gcno' \) -type f -print | xargs rm -f
1435
1436# Generate tags for editors
1437# ---------------------------------------------------------------------------
1438quiet_cmd_tags = GEN $@
1439      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1440
1441tags TAGS cscope gtags: FORCE
1442    $(call cmd,tags)
1443
1444# Scripts to check various things for consistency
1445# ---------------------------------------------------------------------------
1446
1447PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1448
1449includecheck:
1450    find $(srctree)/* $(RCS_FIND_IGNORE) \
1451        -name '*.[hcS]' -type f -print | sort \
1452        | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1453
1454versioncheck:
1455    find $(srctree)/* $(RCS_FIND_IGNORE) \
1456        -name '*.[hcS]' -type f -print | sort \
1457        | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1458
1459coccicheck:
1460    $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1461
1462namespacecheck:
1463    $(PERL) $(srctree)/scripts/namespace.pl
1464
1465export_report:
1466    $(PERL) $(srctree)/scripts/export_report.pl
1467
1468endif #ifeq ($(config-targets),1)
1469endif #ifeq ($(mixed-targets),1)
1470
1471PHONY += checkstack kernelrelease kernelversion image_name
1472
1473# UML needs a little special treatment here. It wants to use the host
1474# toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
1475# else wants $(ARCH), including people doing cross-builds, which means
1476# that $(SUBARCH) doesn't work here.
1477ifeq ($(ARCH), um)
1478CHECKSTACK_ARCH := $(SUBARCH)
1479else
1480CHECKSTACK_ARCH := $(ARCH)
1481endif
1482checkstack:
1483    $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1484    $(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1485
1486kernelrelease:
1487    @echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1488
1489kernelversion:
1490    @echo $(KERNELVERSION)
1491
1492image_name:
1493    @echo $(KBUILD_IMAGE)
1494
1495# Clear a bunch of variables before executing the submake
1496tools/: FORCE
1497    $(Q)mkdir -p $(objtree)/tools
1498    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1499
1500tools/%: FORCE
1501    $(Q)mkdir -p $(objtree)/tools
1502    $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1503
1504# Single targets
1505# ---------------------------------------------------------------------------
1506# Single targets are compatible with:
1507# - build with mixed source and output
1508# - build with separate output dir 'make O=...'
1509# - external modules
1510#
1511# target-dir => where to store outputfile
1512# build-dir => directory in kernel source tree to use
1513
1514ifeq ($(KBUILD_EXTMOD),)
1515        build-dir = $(patsubst %/,%,$(dir $@))
1516        target-dir = $(dir $@)
1517else
1518        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1519        build-dir = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1520        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1521endif
1522
1523%.s: %.c prepare scripts FORCE
1524    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1525%.i: %.c prepare scripts FORCE
1526    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1527%.o: %.c prepare scripts FORCE
1528    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1529%.lst: %.c prepare scripts FORCE
1530    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1531%.s: %.S prepare scripts FORCE
1532    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1533%.o: %.S prepare scripts FORCE
1534    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1535%.symtypes: %.c prepare scripts FORCE
1536    $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1537
1538# Modules
1539/: prepare scripts FORCE
1540    $(cmd_crmodverdir)
1541    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1542    $(build)=$(build-dir)
1543# Make sure the latest headers are built for Documentation
1544Documentation/: headers_install
1545%/: prepare scripts FORCE
1546    $(cmd_crmodverdir)
1547    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1548    $(build)=$(build-dir)
1549%.ko: prepare scripts FORCE
1550    $(cmd_crmodverdir)
1551    $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1552    $(build)=$(build-dir) $(@:.ko=.o)
1553    $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1554
1555# FIXME Should go into a make.lib or something
1556# ===========================================================================
1557
1558quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs)))
1559      cmd_rmdirs = rm -rf $(rm-dirs)
1560
1561quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
1562      cmd_rmfiles = rm -f $(rm-files)
1563
1564# Run depmod only if we have System.map and depmod is executable
1565quiet_cmd_depmod = DEPMOD $(KERNELRELEASE)
1566      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1567                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1568
1569# Create temporary dir for module support files
1570# clean it up only when building all modules
1571cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1572                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1573
1574# read all saved command lines
1575
1576targets := $(wildcard $(sort $(targets)))
1577cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1578
1579ifneq ($(cmd_files),)
1580  $(cmd_files): ; # Do not try to update included dependency files
1581  include $(cmd_files)
1582endif
1583
1584# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir
1585# Usage:
1586# $(Q)$(MAKE) $(clean)=dir
1587clean := -f $(srctree)/scripts/Makefile.clean obj
1588
1589endif # skip-makefile
1590
1591PHONY += FORCE
1592FORCE:
1593
1594# Declare the contents of the .PHONY variable as phony. We keep that
1595# information in a variable so we can use it in if_changed and friends.
1596.PHONY: $(PHONY)
1597

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