xref: /openbmc/linux/Makefile (revision 93d90ad7)
1VERSION = 3
2PATCHLEVEL = 19
3SUBLEVEL = 0
4EXTRAVERSION = -rc5
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/uapi \
395		-Iarch/$(hdr-arch)/include/generated \
396		$(if $(KBUILD_SRC), -I$(srctree)/include) \
397		-Iinclude \
398		$(USERINCLUDE)
399
400KBUILD_CPPFLAGS := -D__KERNEL__
401
402KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
403		   -fno-strict-aliasing -fno-common \
404		   -Werror-implicit-function-declaration \
405		   -Wno-format-security \
406		   -std=gnu89
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 PYTHON 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
485old_version_h := include/linux/version.h
486
487no-dot-config-targets := clean mrproper distclean \
488			 cscope gtags TAGS tags help% %docs check% coccicheck \
489			 $(version_h) headers_% archheaders archscripts \
490			 kernelversion %src-pkg
491
492config-targets := 0
493mixed-targets  := 0
494dot-config     := 1
495
496ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
497	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
498		dot-config := 0
499	endif
500endif
501
502ifeq ($(KBUILD_EXTMOD),)
503        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
504                config-targets := 1
505                ifneq ($(filter-out config %config,$(MAKECMDGOALS)),)
506                        mixed-targets := 1
507                endif
508        endif
509endif
510
511ifeq ($(mixed-targets),1)
512# ===========================================================================
513# We're called with mixed targets (*config and build targets).
514# Handle them one by one.
515
516PHONY += $(MAKECMDGOALS) __build_one_by_one
517
518$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
519	@:
520
521__build_one_by_one:
522	$(Q)set -e; \
523	for i in $(MAKECMDGOALS); do \
524		$(MAKE) -f $(srctree)/Makefile $$i; \
525	done
526
527else
528ifeq ($(config-targets),1)
529# ===========================================================================
530# *config targets only - make sure prerequisites are updated, and descend
531# in scripts/kconfig to make the *config target
532
533# Read arch specific Makefile to set KBUILD_DEFCONFIG as needed.
534# KBUILD_DEFCONFIG may point out an alternative default configuration
535# used for 'make defconfig'
536include $(srctree)/arch/$(SRCARCH)/Makefile
537export KBUILD_DEFCONFIG KBUILD_KCONFIG
538
539config: scripts_basic outputmakefile FORCE
540	$(Q)$(MAKE) $(build)=scripts/kconfig $@
541
542%config: scripts_basic outputmakefile FORCE
543	$(Q)$(MAKE) $(build)=scripts/kconfig $@
544
545else
546# ===========================================================================
547# Build targets only - this includes vmlinux, arch specific targets, clean
548# targets and others. In general all targets except *config targets.
549
550ifeq ($(KBUILD_EXTMOD),)
551# Additional helpers built in scripts/
552# Carefully list dependencies so we do not try to build scripts twice
553# in parallel
554PHONY += scripts
555scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
556	 asm-generic
557	$(Q)$(MAKE) $(build)=$(@)
558
559# Objects we will link into vmlinux / subdirs we need to visit
560init-y		:= init/
561drivers-y	:= drivers/ sound/ firmware/
562net-y		:= net/
563libs-y		:= lib/
564core-y		:= usr/
565endif # KBUILD_EXTMOD
566
567ifeq ($(dot-config),1)
568# Read in config
569-include include/config/auto.conf
570
571ifeq ($(KBUILD_EXTMOD),)
572# Read in dependencies to all Kconfig* files, make sure to run
573# oldconfig if changes are detected.
574-include include/config/auto.conf.cmd
575
576# To avoid any implicit rule to kick in, define an empty command
577$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;
578
579# If .config is newer than include/config/auto.conf, someone tinkered
580# with it and forgot to run make oldconfig.
581# if auto.conf.cmd is missing then we are probably in a cleaned tree so
582# we execute the config step to be sure to catch updated Kconfig files
583include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
584	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
585else
586# external modules needs include/generated/autoconf.h and include/config/auto.conf
587# but do not care if they are up-to-date. Use auto.conf to trigger the test
588PHONY += include/config/auto.conf
589
590include/config/auto.conf:
591	$(Q)test -e include/generated/autoconf.h -a -e $@ || (		\
592	echo >&2;							\
593	echo >&2 "  ERROR: Kernel configuration is invalid.";		\
594	echo >&2 "         include/generated/autoconf.h or $@ are missing.";\
595	echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
596	echo >&2 ;							\
597	/bin/false)
598
599endif # KBUILD_EXTMOD
600
601else
602# Dummy target needed, because used as prerequisite
603include/config/auto.conf: ;
604endif # $(dot-config)
605
606# The all: target is the default when no target is given on the
607# command line.
608# This allow a user to issue only 'make' to build a kernel including modules
609# Defaults to vmlinux, but the arch makefile usually adds further targets
610all: vmlinux
611
612include $(srctree)/arch/$(SRCARCH)/Makefile
613
614KBUILD_CFLAGS	+= $(call cc-option,-fno-delete-null-pointer-checks,)
615
616ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
617KBUILD_CFLAGS	+= -Os $(call cc-disable-warning,maybe-uninitialized,)
618else
619KBUILD_CFLAGS	+= -O2
620endif
621
622# Tell gcc to never replace conditional load with a non-conditional one
623KBUILD_CFLAGS	+= $(call cc-option,--param=allow-store-data-races=0)
624
625ifdef CONFIG_READABLE_ASM
626# Disable optimizations that make assembler listings hard to read.
627# reorder blocks reorders the control in the function
628# ipa clone creates specialized cloned functions
629# partial inlining inlines only parts of functions
630KBUILD_CFLAGS += $(call cc-option,-fno-reorder-blocks,) \
631                 $(call cc-option,-fno-ipa-cp-clone,) \
632                 $(call cc-option,-fno-partial-inlining)
633endif
634
635ifneq ($(CONFIG_FRAME_WARN),0)
636KBUILD_CFLAGS += $(call cc-option,-Wframe-larger-than=${CONFIG_FRAME_WARN})
637endif
638
639# Handle stack protector mode.
640#
641# Since kbuild can potentially perform two passes (first with the old
642# .config values and then with updated .config values), we cannot error out
643# if a desired compiler option is unsupported. If we were to error, kbuild
644# could never get to the second pass and actually notice that we changed
645# the option to something that was supported.
646#
647# Additionally, we don't want to fallback and/or silently change which compiler
648# flags will be used, since that leads to producing kernels with different
649# security feature characteristics depending on the compiler used. ("But I
650# selected CC_STACKPROTECTOR_STRONG! Why did it build with _REGULAR?!")
651#
652# The middle ground is to warn here so that the failed option is obvious, but
653# to let the build fail with bad compiler flags so that we can't produce a
654# kernel when there is a CONFIG and compiler mismatch.
655#
656ifdef CONFIG_CC_STACKPROTECTOR_REGULAR
657  stackp-flag := -fstack-protector
658  ifeq ($(call cc-option, $(stackp-flag)),)
659    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: \
660             -fstack-protector not supported by compiler)
661  endif
662else
663ifdef CONFIG_CC_STACKPROTECTOR_STRONG
664  stackp-flag := -fstack-protector-strong
665  ifeq ($(call cc-option, $(stackp-flag)),)
666    $(warning Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: \
667	      -fstack-protector-strong not supported by compiler)
668  endif
669else
670  # Force off for distro compilers that enable stack protector by default.
671  stackp-flag := $(call cc-option, -fno-stack-protector)
672endif
673endif
674KBUILD_CFLAGS += $(stackp-flag)
675
676ifeq ($(COMPILER),clang)
677KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
678KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
679KBUILD_CFLAGS += $(call cc-disable-warning, unused-variable)
680KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
681KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
682# Quiet clang warning: comparison of unsigned expression < 0 is always false
683KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
684# CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as the
685# source of a reference will be _MergedGlobals and not on of the whitelisted names.
686# See modpost pattern 2
687KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
688KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
689else
690
691# This warning generated too much noise in a regular build.
692# Use make W=1 to enable this warning (see scripts/Makefile.build)
693KBUILD_CFLAGS += $(call cc-disable-warning, unused-but-set-variable)
694endif
695
696ifdef CONFIG_FRAME_POINTER
697KBUILD_CFLAGS	+= -fno-omit-frame-pointer -fno-optimize-sibling-calls
698else
699# Some targets (ARM with Thumb2, for example), can't be built with frame
700# pointers.  For those, we don't have FUNCTION_TRACER automatically
701# select FRAME_POINTER.  However, FUNCTION_TRACER adds -pg, and this is
702# incompatible with -fomit-frame-pointer with current GCC, so we don't use
703# -fomit-frame-pointer with FUNCTION_TRACER.
704ifndef CONFIG_FUNCTION_TRACER
705KBUILD_CFLAGS	+= -fomit-frame-pointer
706endif
707endif
708
709KBUILD_CFLAGS   += $(call cc-option, -fno-var-tracking-assignments)
710
711ifdef CONFIG_DEBUG_INFO
712ifdef CONFIG_DEBUG_INFO_SPLIT
713KBUILD_CFLAGS   += $(call cc-option, -gsplit-dwarf, -g)
714else
715KBUILD_CFLAGS	+= -g
716endif
717KBUILD_AFLAGS	+= -Wa,-gdwarf-2
718endif
719ifdef CONFIG_DEBUG_INFO_DWARF4
720KBUILD_CFLAGS	+= $(call cc-option, -gdwarf-4,)
721endif
722
723ifdef CONFIG_DEBUG_INFO_REDUCED
724KBUILD_CFLAGS 	+= $(call cc-option, -femit-struct-debug-baseonly) \
725		   $(call cc-option,-fno-var-tracking)
726endif
727
728ifdef CONFIG_FUNCTION_TRACER
729ifdef CONFIG_HAVE_FENTRY
730CC_USING_FENTRY	:= $(call cc-option, -mfentry -DCC_USING_FENTRY)
731endif
732KBUILD_CFLAGS	+= -pg $(CC_USING_FENTRY)
733KBUILD_AFLAGS	+= $(CC_USING_FENTRY)
734ifdef CONFIG_DYNAMIC_FTRACE
735	ifdef CONFIG_HAVE_C_RECORDMCOUNT
736		BUILD_C_RECORDMCOUNT := y
737		export BUILD_C_RECORDMCOUNT
738	endif
739endif
740endif
741
742# We trigger additional mismatches with less inlining
743ifdef CONFIG_DEBUG_SECTION_MISMATCH
744KBUILD_CFLAGS += $(call cc-option, -fno-inline-functions-called-once)
745endif
746
747# arch Makefile may override CC so keep this after arch Makefile is included
748NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
749CHECKFLAGS     += $(NOSTDINC_FLAGS)
750
751# warn about C99 declaration after statement
752KBUILD_CFLAGS += $(call cc-option,-Wdeclaration-after-statement,)
753
754# disable pointer signed / unsigned warnings in gcc 4.0
755KBUILD_CFLAGS += $(call cc-disable-warning, pointer-sign)
756
757# disable invalid "can't wrap" optimizations for signed / pointers
758KBUILD_CFLAGS	+= $(call cc-option,-fno-strict-overflow)
759
760# conserve stack if available
761KBUILD_CFLAGS   += $(call cc-option,-fconserve-stack)
762
763# disallow errors like 'EXPORT_GPL(foo);' with missing header
764KBUILD_CFLAGS   += $(call cc-option,-Werror=implicit-int)
765
766# require functions to have arguments in prototypes, not empty 'int foo()'
767KBUILD_CFLAGS   += $(call cc-option,-Werror=strict-prototypes)
768
769# Prohibit date/time macros, which would make the build non-deterministic
770KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)
771
772# use the deterministic mode of AR if available
773KBUILD_ARFLAGS := $(call ar-option,D)
774
775# check for 'asm goto'
776ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-goto.sh $(CC)), y)
777	KBUILD_CFLAGS += -DCC_HAVE_ASM_GOTO
778endif
779
780include $(srctree)/scripts/Makefile.extrawarn
781
782# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
783KBUILD_CPPFLAGS += $(KCPPFLAGS)
784KBUILD_AFLAGS += $(KAFLAGS)
785KBUILD_CFLAGS += $(KCFLAGS)
786
787# Use --build-id when available.
788LDFLAGS_BUILD_ID = $(patsubst -Wl$(comma)%,%,\
789			      $(call cc-ldoption, -Wl$(comma)--build-id,))
790KBUILD_LDFLAGS_MODULE += $(LDFLAGS_BUILD_ID)
791LDFLAGS_vmlinux += $(LDFLAGS_BUILD_ID)
792
793ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
794LDFLAGS_vmlinux	+= $(call ld-option, -X,)
795endif
796
797# Default kernel image to build when no specific target is given.
798# KBUILD_IMAGE may be overruled on the command line or
799# set in the environment
800# Also any assignments in arch/$(ARCH)/Makefile take precedence over
801# this default value
802export KBUILD_IMAGE ?= vmlinux
803
804#
805# INSTALL_PATH specifies where to place the updated kernel and system map
806# images. Default is /boot, but you can set it to other values
807export	INSTALL_PATH ?= /boot
808
809#
810# INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
811# Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
812# an argument if needed. Otherwise it defaults to the kernel install path
813#
814export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
815
816#
817# INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
818# relocations required by build roots.  This is not defined in the
819# makefile but the argument can be passed to make if needed.
820#
821
822MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
823export MODLIB
824
825#
826# INSTALL_MOD_STRIP, if defined, will cause modules to be
827# stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then
828# the default option --strip-debug will be used.  Otherwise,
829# INSTALL_MOD_STRIP value will be used as the options to the strip command.
830
831ifdef INSTALL_MOD_STRIP
832ifeq ($(INSTALL_MOD_STRIP),1)
833mod_strip_cmd = $(STRIP) --strip-debug
834else
835mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)
836endif # INSTALL_MOD_STRIP=1
837else
838mod_strip_cmd = true
839endif # INSTALL_MOD_STRIP
840export mod_strip_cmd
841
842# CONFIG_MODULE_COMPRESS, if defined, will cause module to be compressed
843# after they are installed in agreement with CONFIG_MODULE_COMPRESS_GZIP
844# or CONFIG_MODULE_COMPRESS_XZ.
845
846mod_compress_cmd = true
847ifdef CONFIG_MODULE_COMPRESS
848  ifdef CONFIG_MODULE_COMPRESS_GZIP
849    mod_compress_cmd = gzip -n
850  endif # CONFIG_MODULE_COMPRESS_GZIP
851  ifdef CONFIG_MODULE_COMPRESS_XZ
852    mod_compress_cmd = xz
853  endif # CONFIG_MODULE_COMPRESS_XZ
854endif # CONFIG_MODULE_COMPRESS
855export mod_compress_cmd
856
857# Select initial ramdisk compression format, default is gzip(1).
858# This shall be used by the dracut(8) tool while creating an initramfs image.
859#
860INITRD_COMPRESS-y                  := gzip
861INITRD_COMPRESS-$(CONFIG_RD_BZIP2) := bzip2
862INITRD_COMPRESS-$(CONFIG_RD_LZMA)  := lzma
863INITRD_COMPRESS-$(CONFIG_RD_XZ)    := xz
864INITRD_COMPRESS-$(CONFIG_RD_LZO)   := lzo
865INITRD_COMPRESS-$(CONFIG_RD_LZ4)   := lz4
866# do not export INITRD_COMPRESS, since we didn't actually
867# choose a sane default compression above.
868# export INITRD_COMPRESS := $(INITRD_COMPRESS-y)
869
870ifdef CONFIG_MODULE_SIG_ALL
871MODSECKEY = ./signing_key.priv
872MODPUBKEY = ./signing_key.x509
873export MODPUBKEY
874mod_sign_cmd = perl $(srctree)/scripts/sign-file $(CONFIG_MODULE_SIG_HASH) $(MODSECKEY) $(MODPUBKEY)
875else
876mod_sign_cmd = true
877endif
878export mod_sign_cmd
879
880
881ifeq ($(KBUILD_EXTMOD),)
882core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/
883
884vmlinux-dirs	:= $(patsubst %/,%,$(filter %/, $(init-y) $(init-m) \
885		     $(core-y) $(core-m) $(drivers-y) $(drivers-m) \
886		     $(net-y) $(net-m) $(libs-y) $(libs-m)))
887
888vmlinux-alldirs	:= $(sort $(vmlinux-dirs) $(patsubst %/,%,$(filter %/, \
889		     $(init-) $(core-) $(drivers-) $(net-) $(libs-))))
890
891init-y		:= $(patsubst %/, %/built-in.o, $(init-y))
892core-y		:= $(patsubst %/, %/built-in.o, $(core-y))
893drivers-y	:= $(patsubst %/, %/built-in.o, $(drivers-y))
894net-y		:= $(patsubst %/, %/built-in.o, $(net-y))
895libs-y1		:= $(patsubst %/, %/lib.a, $(libs-y))
896libs-y2		:= $(patsubst %/, %/built-in.o, $(libs-y))
897libs-y		:= $(libs-y1) $(libs-y2)
898
899# Externally visible symbols (used by link-vmlinux.sh)
900export KBUILD_VMLINUX_INIT := $(head-y) $(init-y)
901export KBUILD_VMLINUX_MAIN := $(core-y) $(libs-y) $(drivers-y) $(net-y)
902export KBUILD_LDS          := arch/$(SRCARCH)/kernel/vmlinux.lds
903export LDFLAGS_vmlinux
904# used by scripts/pacmage/Makefile
905export KBUILD_ALLDIRS := $(sort $(filter-out arch/%,$(vmlinux-alldirs)) arch Documentation include samples scripts tools virt)
906
907vmlinux-deps := $(KBUILD_LDS) $(KBUILD_VMLINUX_INIT) $(KBUILD_VMLINUX_MAIN)
908
909# Final link of vmlinux
910      cmd_link-vmlinux = $(CONFIG_SHELL) $< $(LD) $(LDFLAGS) $(LDFLAGS_vmlinux)
911quiet_cmd_link-vmlinux = LINK    $@
912
913# Include targets which we want to
914# execute if the rest of the kernel build went well.
915vmlinux: scripts/link-vmlinux.sh $(vmlinux-deps) FORCE
916ifdef CONFIG_HEADERS_CHECK
917	$(Q)$(MAKE) -f $(srctree)/Makefile headers_check
918endif
919ifdef CONFIG_SAMPLES
920	$(Q)$(MAKE) $(build)=samples
921endif
922ifdef CONFIG_BUILD_DOCSRC
923	$(Q)$(MAKE) $(build)=Documentation
924endif
925	+$(call if_changed,link-vmlinux)
926
927# The actual objects are generated when descending,
928# make sure no implicit rule kicks in
929$(sort $(vmlinux-deps)): $(vmlinux-dirs) ;
930
931# Handle descending into subdirectories listed in $(vmlinux-dirs)
932# Preset locale variables to speed up the build process. Limit locale
933# tweaks to this spot to avoid wrong language settings when running
934# make menuconfig etc.
935# Error messages still appears in the original language
936
937PHONY += $(vmlinux-dirs)
938$(vmlinux-dirs): prepare scripts
939	$(Q)$(MAKE) $(build)=$@
940
941define filechk_kernel.release
942	echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
943endef
944
945# Store (new) KERNELRELEASE string in include/config/kernel.release
946include/config/kernel.release: include/config/auto.conf FORCE
947	$(call filechk,kernel.release)
948
949
950# Things we need to do before we recursively start building the kernel
951# or the modules are listed in "prepare".
952# A multi level approach is used. prepareN is processed before prepareN-1.
953# archprepare is used in arch Makefiles and when processed asm symlink,
954# version.h and scripts_basic is processed / created.
955
956# Listed in dependency order
957PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3
958
959# prepare3 is used to check if we are building in a separate output directory,
960# and if so do:
961# 1) Check that make has not been executed in the kernel src $(srctree)
962prepare3: include/config/kernel.release
963ifneq ($(KBUILD_SRC),)
964	@$(kecho) '  Using $(srctree) as source for kernel'
965	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
966		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
967		echo >&2 "  in the '$(srctree)' directory.";\
968		/bin/false; \
969	fi;
970endif
971
972# prepare2 creates a makefile if using a separate output directory
973prepare2: prepare3 outputmakefile asm-generic
974
975prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
976                   include/config/auto.conf
977	$(cmd_crmodverdir)
978
979archprepare: archheaders archscripts prepare1 scripts_basic
980
981prepare0: archprepare FORCE
982	$(Q)$(MAKE) $(build)=.
983
984# All the preparing..
985prepare: prepare0
986
987# Generate some files
988# ---------------------------------------------------------------------------
989
990# KERNELRELEASE can change from a few different places, meaning version.h
991# needs to be updated, so this check is forced on all builds
992
993uts_len := 64
994define filechk_utsrelease.h
995	if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
996	  echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2;    \
997	  exit 1;                                                         \
998	fi;                                                               \
999	(echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";)
1000endef
1001
1002define filechk_version.h
1003	(echo \#define LINUX_VERSION_CODE $(shell                         \
1004	expr $(VERSION) \* 65536 + 0$(PATCHLEVEL) \* 256 + 0$(SUBLEVEL)); \
1005	echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';)
1006endef
1007
1008$(version_h): $(srctree)/Makefile FORCE
1009	$(call filechk,version.h)
1010	$(Q)rm -f $(old_version_h)
1011
1012include/generated/utsrelease.h: include/config/kernel.release FORCE
1013	$(call filechk,utsrelease.h)
1014
1015PHONY += headerdep
1016headerdep:
1017	$(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1018	$(srctree)/scripts/headerdep.pl -I$(srctree)/include
1019
1020# ---------------------------------------------------------------------------
1021
1022PHONY += depend dep
1023depend dep:
1024	@echo '*** Warning: make $@ is unnecessary now.'
1025
1026# ---------------------------------------------------------------------------
1027# Firmware install
1028INSTALL_FW_PATH=$(INSTALL_MOD_PATH)/lib/firmware
1029export INSTALL_FW_PATH
1030
1031PHONY += firmware_install
1032firmware_install: FORCE
1033	@mkdir -p $(objtree)/firmware
1034	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_install
1035
1036# ---------------------------------------------------------------------------
1037# Kernel headers
1038
1039#Default location for installed headers
1040export INSTALL_HDR_PATH = $(objtree)/usr
1041
1042# If we do an all arch process set dst to asm-$(hdr-arch)
1043hdr-dst = $(if $(KBUILD_HEADERS), dst=include/asm-$(hdr-arch), dst=include/asm)
1044
1045PHONY += archheaders
1046archheaders:
1047
1048PHONY += archscripts
1049archscripts:
1050
1051PHONY += __headers
1052__headers: $(version_h) scripts_basic asm-generic archheaders archscripts FORCE
1053	$(Q)$(MAKE) $(build)=scripts build_unifdef
1054
1055PHONY += headers_install_all
1056headers_install_all:
1057	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh install
1058
1059PHONY += headers_install
1060headers_install: __headers
1061	$(if $(wildcard $(srctree)/arch/$(hdr-arch)/include/uapi/asm/Kbuild),, \
1062	  $(error Headers not exportable for the $(SRCARCH) architecture))
1063	$(Q)$(MAKE) $(hdr-inst)=include/uapi
1064	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst)
1065
1066PHONY += headers_check_all
1067headers_check_all: headers_install_all
1068	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/headers.sh check
1069
1070PHONY += headers_check
1071headers_check: headers_install
1072	$(Q)$(MAKE) $(hdr-inst)=include/uapi HDRCHECK=1
1073	$(Q)$(MAKE) $(hdr-inst)=arch/$(hdr-arch)/include/uapi/asm $(hdr-dst) HDRCHECK=1
1074
1075# ---------------------------------------------------------------------------
1076# Kernel selftest
1077
1078PHONY += kselftest
1079kselftest:
1080	$(Q)$(MAKE) -C tools/testing/selftests run_tests
1081
1082# ---------------------------------------------------------------------------
1083# Modules
1084
1085ifdef CONFIG_MODULES
1086
1087# By default, build modules as well
1088
1089all: modules
1090
1091# Build modules
1092#
1093# A module can be listed more than once in obj-m resulting in
1094# duplicate lines in modules.order files.  Those are removed
1095# using awk while concatenating to the final file.
1096
1097PHONY += modules
1098modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux) modules.builtin
1099	$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
1100	@$(kecho) '  Building modules, stage 2.';
1101	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1102	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
1103
1104modules.builtin: $(vmlinux-dirs:%=%/modules.builtin)
1105	$(Q)$(AWK) '!x[$$0]++' $^ > $(objtree)/modules.builtin
1106
1107%/modules.builtin: include/config/auto.conf
1108	$(Q)$(MAKE) $(modbuiltin)=$*
1109
1110
1111# Target to prepare building external modules
1112PHONY += modules_prepare
1113modules_prepare: prepare scripts
1114
1115# Target to install modules
1116PHONY += modules_install
1117modules_install: _modinst_ _modinst_post
1118
1119PHONY += _modinst_
1120_modinst_:
1121	@rm -rf $(MODLIB)/kernel
1122	@rm -f $(MODLIB)/source
1123	@mkdir -p $(MODLIB)/kernel
1124	@ln -s `cd $(srctree) && /bin/pwd` $(MODLIB)/source
1125	@if [ ! $(objtree) -ef  $(MODLIB)/build ]; then \
1126		rm -f $(MODLIB)/build ; \
1127		ln -s $(CURDIR) $(MODLIB)/build ; \
1128	fi
1129	@cp -f $(objtree)/modules.order $(MODLIB)/
1130	@cp -f $(objtree)/modules.builtin $(MODLIB)/
1131	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1132
1133# This depmod is only for convenience to give the initial
1134# boot a modules.dep even before / is mounted read-write.  However the
1135# boot script depmod is the master version.
1136PHONY += _modinst_post
1137_modinst_post: _modinst_
1138	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modinst
1139	$(call cmd,depmod)
1140
1141ifeq ($(CONFIG_MODULE_SIG), y)
1142PHONY += modules_sign
1143modules_sign:
1144	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modsign
1145endif
1146
1147else # CONFIG_MODULES
1148
1149# Modules not configured
1150# ---------------------------------------------------------------------------
1151
1152modules modules_install: FORCE
1153	@echo >&2
1154	@echo >&2 "The present kernel configuration has modules disabled."
1155	@echo >&2 "Type 'make config' and enable loadable module support."
1156	@echo >&2 "Then build a kernel with module support enabled."
1157	@echo >&2
1158	@exit 1
1159
1160endif # CONFIG_MODULES
1161
1162###
1163# Cleaning is done on three levels.
1164# make clean     Delete most generated files
1165#                Leave enough to build external modules
1166# make mrproper  Delete the current configuration, and all generated files
1167# make distclean Remove editor backup files, patch leftover files and the like
1168
1169# Directories & files removed with 'make clean'
1170CLEAN_DIRS  += $(MODVERDIR)
1171
1172# Directories & files removed with 'make mrproper'
1173MRPROPER_DIRS  += include/config usr/include include/generated          \
1174		  arch/*/include/generated .tmp_objdiff
1175MRPROPER_FILES += .config .config.old .version .old_version $(version_h) \
1176		  Module.symvers tags TAGS cscope* GPATH GTAGS GRTAGS GSYMS \
1177		  signing_key.priv signing_key.x509 x509.genkey		\
1178		  extra_certificates signing_key.x509.keyid		\
1179		  signing_key.x509.signer
1180
1181# clean - Delete most, but leave enough to build external modules
1182#
1183clean: rm-dirs  := $(CLEAN_DIRS)
1184clean: rm-files := $(CLEAN_FILES)
1185clean-dirs      := $(addprefix _clean_, . $(vmlinux-alldirs) Documentation samples)
1186
1187PHONY += $(clean-dirs) clean archclean vmlinuxclean
1188$(clean-dirs):
1189	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1190
1191vmlinuxclean:
1192	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1193
1194clean: archclean vmlinuxclean
1195
1196# mrproper - Delete all generated files, including .config
1197#
1198mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
1199mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
1200mrproper-dirs      := $(addprefix _mrproper_,Documentation/DocBook scripts)
1201
1202PHONY += $(mrproper-dirs) mrproper archmrproper
1203$(mrproper-dirs):
1204	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1205
1206mrproper: clean archmrproper $(mrproper-dirs)
1207	$(call cmd,rmdirs)
1208	$(call cmd,rmfiles)
1209
1210# distclean
1211#
1212PHONY += distclean
1213
1214distclean: mrproper
1215	@find $(srctree) $(RCS_FIND_IGNORE) \
1216		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1217		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
1218		-o -name '.*.rej' -o -name '*%'  -o -name 'core' \) \
1219		-type f -print | xargs rm -f
1220
1221
1222# Packaging of the kernel to various formats
1223# ---------------------------------------------------------------------------
1224# rpm target kept for backward compatibility
1225package-dir	:= scripts/package
1226
1227%src-pkg: FORCE
1228	$(Q)$(MAKE) $(build)=$(package-dir) $@
1229%pkg: include/config/kernel.release FORCE
1230	$(Q)$(MAKE) $(build)=$(package-dir) $@
1231rpm: include/config/kernel.release FORCE
1232	$(Q)$(MAKE) $(build)=$(package-dir) $@
1233
1234
1235# Brief documentation of the typical targets used
1236# ---------------------------------------------------------------------------
1237
1238boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1239boards := $(sort $(notdir $(boards)))
1240board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1241board-dirs := $(sort $(notdir $(board-dirs:/=)))
1242
1243help:
1244	@echo  'Cleaning targets:'
1245	@echo  '  clean		  - Remove most generated files but keep the config and'
1246	@echo  '                    enough build support to build external modules'
1247	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
1248	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
1249	@echo  ''
1250	@echo  'Configuration targets:'
1251	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1252	@echo  ''
1253	@echo  'Other generic targets:'
1254	@echo  '  all		  - Build all targets marked with [*]'
1255	@echo  '* vmlinux	  - Build the bare kernel'
1256	@echo  '* modules	  - Build all modules'
1257	@echo  '  modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1258	@echo  '  firmware_install- Install all firmware to INSTALL_FW_PATH'
1259	@echo  '                    (default: $$(INSTALL_MOD_PATH)/lib/firmware)'
1260	@echo  '  dir/            - Build all files in dir and below'
1261	@echo  '  dir/file.[oisS] - Build specified target only'
1262	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
1263	@echo  '                    (requires a recent binutils and recent build (System.map))'
1264	@echo  '  dir/file.ko     - Build module including final link'
1265	@echo  '  modules_prepare - Set up for building external modules'
1266	@echo  '  tags/TAGS	  - Generate tags file for editors'
1267	@echo  '  cscope	  - Generate cscope index'
1268	@echo  '  gtags           - Generate GNU GLOBAL index'
1269	@echo  '  kernelrelease	  - Output the release version string (use with make -s)'
1270	@echo  '  kernelversion	  - Output the version stored in Makefile (use with make -s)'
1271	@echo  '  image_name	  - Output the image name (use with make -s)'
1272	@echo  '  headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1273	 echo  '                    (default: $(INSTALL_HDR_PATH))'; \
1274	 echo  ''
1275	@echo  'Static analysers'
1276	@echo  '  checkstack      - Generate a list of stack hogs'
1277	@echo  '  namespacecheck  - Name space analysis on compiled kernel'
1278	@echo  '  versioncheck    - Sanity check on version.h usage'
1279	@echo  '  includecheck    - Check for duplicate included header files'
1280	@echo  '  export_report   - List the usages of all exported symbols'
1281	@echo  '  headers_check   - Sanity check on exported headers'
1282	@echo  '  headerdep       - Detect inclusion cycles in headers'
1283	@$(MAKE) -f $(srctree)/scripts/Makefile.help checker-help
1284	@echo  ''
1285	@echo  'Kernel selftest'
1286	@echo  '  kselftest       - Build and run kernel selftest (run as root)'
1287	@echo  '                    Build, install, and boot kernel before'
1288	@echo  '                    running kselftest on it'
1289	@echo  ''
1290	@echo  'Kernel packaging:'
1291	@$(MAKE) $(build)=$(package-dir) help
1292	@echo  ''
1293	@echo  'Documentation targets:'
1294	@$(MAKE) -f $(srctree)/Documentation/DocBook/Makefile dochelp
1295	@echo  ''
1296	@echo  'Architecture specific targets ($(SRCARCH)):'
1297	@$(if $(archhelp),$(archhelp),\
1298		echo '  No architecture specific help defined for $(SRCARCH)')
1299	@echo  ''
1300	@$(if $(boards), \
1301		$(foreach b, $(boards), \
1302		printf "  %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1303		echo '')
1304	@$(if $(board-dirs), \
1305		$(foreach b, $(board-dirs), \
1306		printf "  %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1307		printf "  %-16s - Show all of the above\\n" help-boards; \
1308		echo '')
1309
1310	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
1311	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
1312	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
1313	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
1314	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
1315	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1316	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
1317	@echo  '		1: warnings which may be relevant and do not occur too often'
1318	@echo  '		2: warnings which occur quite often but may still be relevant'
1319	@echo  '		3: more obscure warnings, can most likely be ignored'
1320	@echo  '		Multiple levels can be combined with W=12 or W=123'
1321	@echo  ''
1322	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
1323	@echo  'For further info see the ./README file'
1324
1325
1326help-board-dirs := $(addprefix help-,$(board-dirs))
1327
1328help-boards: $(help-board-dirs)
1329
1330boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1331
1332$(help-board-dirs): help-%:
1333	@echo  'Architecture specific targets ($(SRCARCH) $*):'
1334	@$(if $(boards-per-dir), \
1335		$(foreach b, $(boards-per-dir), \
1336		printf "  %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1337		echo '')
1338
1339
1340# Documentation targets
1341# ---------------------------------------------------------------------------
1342%docs: scripts_basic FORCE
1343	$(Q)$(MAKE) $(build)=scripts build_docproc
1344	$(Q)$(MAKE) $(build)=Documentation/DocBook $@
1345
1346else # KBUILD_EXTMOD
1347
1348###
1349# External module support.
1350# When building external modules the kernel used as basis is considered
1351# read-only, and no consistency checks are made and the make
1352# system is not used on the basis kernel. If updates are required
1353# in the basis kernel ordinary make commands (without M=...) must
1354# be used.
1355#
1356# The following are the only valid targets when building external
1357# modules.
1358# make M=dir clean     Delete all automatically generated files
1359# make M=dir modules   Make all modules in specified dir
1360# make M=dir	       Same as 'make M=dir modules'
1361# make M=dir modules_install
1362#                      Install the modules built in the module directory
1363#                      Assumes install directory is already created
1364
1365# We are always building modules
1366KBUILD_MODULES := 1
1367PHONY += crmodverdir
1368crmodverdir:
1369	$(cmd_crmodverdir)
1370
1371PHONY += $(objtree)/Module.symvers
1372$(objtree)/Module.symvers:
1373	@test -e $(objtree)/Module.symvers || ( \
1374	echo; \
1375	echo "  WARNING: Symbol version dump $(objtree)/Module.symvers"; \
1376	echo "           is missing; modules will have no dependencies and modversions."; \
1377	echo )
1378
1379module-dirs := $(addprefix _module_,$(KBUILD_EXTMOD))
1380PHONY += $(module-dirs) modules
1381$(module-dirs): crmodverdir $(objtree)/Module.symvers
1382	$(Q)$(MAKE) $(build)=$(patsubst _module_%,%,$@)
1383
1384modules: $(module-dirs)
1385	@$(kecho) '  Building modules, stage 2.';
1386	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1387
1388PHONY += modules_install
1389modules_install: _emodinst_ _emodinst_post
1390
1391install-dir := $(if $(INSTALL_MOD_DIR),$(INSTALL_MOD_DIR),extra)
1392PHONY += _emodinst_
1393_emodinst_:
1394	$(Q)mkdir -p $(MODLIB)/$(install-dir)
1395	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst
1396
1397PHONY += _emodinst_post
1398_emodinst_post: _emodinst_
1399	$(call cmd,depmod)
1400
1401clean-dirs := $(addprefix _clean_,$(KBUILD_EXTMOD))
1402
1403PHONY += $(clean-dirs) clean
1404$(clean-dirs):
1405	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1406
1407clean:	rm-dirs := $(MODVERDIR)
1408clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
1409
1410help:
1411	@echo  '  Building external modules.'
1412	@echo  '  Syntax: make -C path/to/kernel/src M=$$PWD target'
1413	@echo  ''
1414	@echo  '  modules         - default target, build the module(s)'
1415	@echo  '  modules_install - install the module'
1416	@echo  '  clean           - remove generated files in module directory only'
1417	@echo  ''
1418
1419# Dummies...
1420PHONY += prepare scripts
1421prepare: ;
1422scripts: ;
1423endif # KBUILD_EXTMOD
1424
1425clean: $(clean-dirs)
1426	$(call cmd,rmdirs)
1427	$(call cmd,rmfiles)
1428	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1429		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
1430		-o -name '*.ko.*' \
1431		-o -name '*.dwo'  \
1432		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1433		-o -name '*.symtypes' -o -name 'modules.order' \
1434		-o -name modules.builtin -o -name '.tmp_*.o.*' \
1435		-o -name '*.gcno' \) -type f -print | xargs rm -f
1436
1437# Generate tags for editors
1438# ---------------------------------------------------------------------------
1439quiet_cmd_tags = GEN     $@
1440      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
1441
1442tags TAGS cscope gtags: FORCE
1443	$(call cmd,tags)
1444
1445# Scripts to check various things for consistency
1446# ---------------------------------------------------------------------------
1447
1448PHONY += includecheck versioncheck coccicheck namespacecheck export_report
1449
1450includecheck:
1451	find $(srctree)/* $(RCS_FIND_IGNORE) \
1452		-name '*.[hcS]' -type f -print | sort \
1453		| xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
1454
1455versioncheck:
1456	find $(srctree)/* $(RCS_FIND_IGNORE) \
1457		-name '*.[hcS]' -type f -print | sort \
1458		| xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
1459
1460coccicheck:
1461	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
1462
1463namespacecheck:
1464	$(PERL) $(srctree)/scripts/namespace.pl
1465
1466export_report:
1467	$(PERL) $(srctree)/scripts/export_report.pl
1468
1469endif #ifeq ($(config-targets),1)
1470endif #ifeq ($(mixed-targets),1)
1471
1472PHONY += checkstack kernelrelease kernelversion image_name
1473
1474# UML needs a little special treatment here.  It wants to use the host
1475# toolchain, so needs $(SUBARCH) passed to checkstack.pl.  Everyone
1476# else wants $(ARCH), including people doing cross-builds, which means
1477# that $(SUBARCH) doesn't work here.
1478ifeq ($(ARCH), um)
1479CHECKSTACK_ARCH := $(SUBARCH)
1480else
1481CHECKSTACK_ARCH := $(ARCH)
1482endif
1483checkstack:
1484	$(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
1485	$(PERL) $(src)/scripts/checkstack.pl $(CHECKSTACK_ARCH)
1486
1487kernelrelease:
1488	@echo "$(KERNELVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
1489
1490kernelversion:
1491	@echo $(KERNELVERSION)
1492
1493image_name:
1494	@echo $(KBUILD_IMAGE)
1495
1496# Clear a bunch of variables before executing the submake
1497tools/: FORCE
1498	$(Q)mkdir -p $(objtree)/tools
1499	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/
1500
1501tools/%: FORCE
1502	$(Q)mkdir -p $(objtree)/tools
1503	$(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(filter --j% -j,$(MAKEFLAGS))" O=$(objtree) subdir=tools -C $(src)/tools/ $*
1504
1505# Single targets
1506# ---------------------------------------------------------------------------
1507# Single targets are compatible with:
1508# - build with mixed source and output
1509# - build with separate output dir 'make O=...'
1510# - external modules
1511#
1512#  target-dir => where to store outputfile
1513#  build-dir  => directory in kernel source tree to use
1514
1515ifeq ($(KBUILD_EXTMOD),)
1516        build-dir  = $(patsubst %/,%,$(dir $@))
1517        target-dir = $(dir $@)
1518else
1519        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
1520        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
1521        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
1522endif
1523
1524%.s: %.c prepare scripts FORCE
1525	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1526%.i: %.c prepare scripts FORCE
1527	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1528%.o: %.c prepare scripts FORCE
1529	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1530%.lst: %.c prepare scripts FORCE
1531	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1532%.s: %.S prepare scripts FORCE
1533	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1534%.o: %.S prepare scripts FORCE
1535	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1536%.symtypes: %.c prepare scripts FORCE
1537	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
1538
1539# Modules
1540/: prepare scripts FORCE
1541	$(cmd_crmodverdir)
1542	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1543	$(build)=$(build-dir)
1544# Make sure the latest headers are built for Documentation
1545Documentation/: headers_install
1546%/: prepare scripts FORCE
1547	$(cmd_crmodverdir)
1548	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
1549	$(build)=$(build-dir)
1550%.ko: prepare scripts FORCE
1551	$(cmd_crmodverdir)
1552	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
1553	$(build)=$(build-dir) $(@:.ko=.o)
1554	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1555
1556# FIXME Should go into a make.lib or something
1557# ===========================================================================
1558
1559quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
1560      cmd_rmdirs = rm -rf $(rm-dirs)
1561
1562quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
1563      cmd_rmfiles = rm -f $(rm-files)
1564
1565# Run depmod only if we have System.map and depmod is executable
1566quiet_cmd_depmod = DEPMOD  $(KERNELRELEASE)
1567      cmd_depmod = $(CONFIG_SHELL) $(srctree)/scripts/depmod.sh $(DEPMOD) \
1568                   $(KERNELRELEASE) "$(patsubst y,_,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))"
1569
1570# Create temporary dir for module support files
1571# clean it up only when building all modules
1572cmd_crmodverdir = $(Q)mkdir -p $(MODVERDIR) \
1573                  $(if $(KBUILD_MODULES),; rm -f $(MODVERDIR)/*)
1574
1575# read all saved command lines
1576
1577targets := $(wildcard $(sort $(targets)))
1578cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
1579
1580ifneq ($(cmd_files),)
1581  $(cmd_files): ;	# Do not try to update included dependency files
1582  include $(cmd_files)
1583endif
1584
1585endif	# skip-makefile
1586
1587PHONY += FORCE
1588FORCE:
1589
1590# Declare the contents of the .PHONY variable as phony.  We keep that
1591# information in a variable so we can use it in if_changed and friends.
1592.PHONY: $(PHONY)
1593