1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 6
3 PATCHLEVEL = 11
4 SUBLEVEL = 5
5 EXTRAVERSION =
6 NAME = Baby Opossum Posse
7
8 # *DOCUMENTATION*
9 # To see a list of typical targets execute "make help"
10 # More info can be located in ./README
11 # Comments in this file are targeted only to the developer, do not
12 # expect to learn how to build the kernel reading this file.
13
14 ifeq ($(filter output-sync,$(.FEATURES)),)
15 $(error GNU Make >= 4.0 is required. Your Make version is $(MAKE_VERSION))
16 endif
17
18 $(if $(filter __%, $(MAKECMDGOALS)), \
19 $(error targets prefixed with '__' are only for internal use))
20
21 # That's our default target when none is given on the command line
22 PHONY := __all
23 __all:
24
25 # We are using a recursive build, so we need to do a little thinking
26 # to get the ordering right.
27 #
28 # Most importantly: sub-Makefiles should only ever modify files in
29 # their own directory. If in some directory we have a dependency on
30 # a file in another dir (which doesn't happen often, but it's often
31 # unavoidable when linking the built-in.a targets which finally
32 # turn into vmlinux), we will call a sub make in that other dir, and
33 # after that we are sure that everything which is in that other dir
34 # is now up to date.
35 #
36 # The only cases where we need to modify files which have global
37 # effects are thus separated out and done before the recursive
38 # descending is started. They are now explicitly listed as the
39 # prepare rule.
40
41 this-makefile := $(lastword $(MAKEFILE_LIST))
42 abs_srctree := $(realpath $(dir $(this-makefile)))
43 abs_objtree := $(CURDIR)
44
45 ifneq ($(sub_make_done),1)
46
47 # Do not use make's built-in rules and variables
48 # (this increases performance and avoids hard-to-debug behaviour)
49 MAKEFLAGS += -rR
50
51 # Avoid funny character set dependencies
52 unexport LC_ALL
53 LC_COLLATE=C
54 LC_NUMERIC=C
55 export LC_COLLATE LC_NUMERIC
56
57 # Avoid interference with shell env settings
58 unexport GREP_OPTIONS
59
60 # Beautify output
61 # ---------------------------------------------------------------------------
62 #
63 # Most of build commands in Kbuild start with "cmd_". You can optionally define
64 # "quiet_cmd_*". If defined, the short log is printed. Otherwise, no log from
65 # that command is printed by default.
66 #
67 # e.g.)
68 # quiet_cmd_depmod = DEPMOD $(MODLIB)
69 # cmd_depmod = $(srctree)/scripts/depmod.sh $(DEPMOD) $(KERNELRELEASE)
70 #
71 # A simple variant is to prefix commands with $(Q) - that's useful
72 # for commands that shall be hidden in non-verbose mode.
73 #
74 # $(Q)$(MAKE) $(build)=scripts/basic
75 #
76 # If KBUILD_VERBOSE contains 1, the whole command is echoed.
77 # If KBUILD_VERBOSE contains 2, the reason for rebuilding is printed.
78 #
79 # To put more focus on warnings, be less verbose as default
80 # Use 'make V=1' to see the full commands
81
82 ifeq ("$(origin V)", "command line")
83 KBUILD_VERBOSE = $(V)
84 endif
85
86 quiet = quiet_
87 Q = @
88
89 ifneq ($(findstring 1, $(KBUILD_VERBOSE)),)
90 quiet =
91 Q =
92 endif
93
94 # If the user is running make -s (silent mode), suppress echoing of
95 # commands
96 ifneq ($(findstring s,$(firstword -$(MAKEFLAGS))),)
97 quiet=silent_
98 override KBUILD_VERBOSE :=
99 endif
100
101 export quiet Q KBUILD_VERBOSE
102
103 # Call a source code checker (by default, "sparse") as part of the
104 # C compilation.
105 #
106 # Use 'make C=1' to enable checking of only re-compiled files.
107 # Use 'make C=2' to enable checking of *all* source files, regardless
108 # of whether they are re-compiled or not.
109 #
110 # See the file "Documentation/dev-tools/sparse.rst" for more details,
111 # including where to get the "sparse" utility.
112
113 ifeq ("$(origin C)", "command line")
114 KBUILD_CHECKSRC = $(C)
115 endif
116 ifndef KBUILD_CHECKSRC
117 KBUILD_CHECKSRC = 0
118 endif
119
120 export KBUILD_CHECKSRC
121
122 # Enable "clippy" (a linter) as part of the Rust compilation.
123 #
124 # Use 'make CLIPPY=1' to enable it.
125 ifeq ("$(origin CLIPPY)", "command line")
126 KBUILD_CLIPPY := $(CLIPPY)
127 endif
128
129 export KBUILD_CLIPPY
130
131 # Use make M=dir or set the environment variable KBUILD_EXTMOD to specify the
132 # directory of external module to build. Setting M= takes precedence.
133 ifeq ("$(origin M)", "command line")
134 KBUILD_EXTMOD := $(M)
135 endif
136
137 $(if $(word 2, $(KBUILD_EXTMOD)), \
138 $(error building multiple external modules is not supported))
139
140 $(foreach x, % :, $(if $(findstring $x, $(KBUILD_EXTMOD)), \
141 $(error module directory path cannot contain '$x')))
142
143 # Remove trailing slashes
144 ifneq ($(filter %/, $(KBUILD_EXTMOD)),)
145 KBUILD_EXTMOD := $(shell dirname $(KBUILD_EXTMOD).)
146 endif
147
148 export KBUILD_EXTMOD
149
150 # backward compatibility
151 KBUILD_EXTRA_WARN ?= $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)
152
153 ifeq ("$(origin W)", "command line")
154 KBUILD_EXTRA_WARN := $(W)
155 endif
156
157 export KBUILD_EXTRA_WARN
158
159 # Kbuild will save output files in the current working directory.
160 # This does not need to match to the root of the kernel source tree.
161 #
162 # For example, you can do this:
163 #
164 # cd /dir/to/store/output/files; make -f /dir/to/kernel/source/Makefile
165 #
166 # If you want to save output files in a different location, there are
167 # two syntaxes to specify it.
168 #
169 # 1) O=
170 # Use "make O=dir/to/store/output/files/"
171 #
172 # 2) Set KBUILD_OUTPUT
173 # Set the environment variable KBUILD_OUTPUT to point to the output directory.
174 # export KBUILD_OUTPUT=dir/to/store/output/files/; make
175 #
176 # The O= assignment takes precedence over the KBUILD_OUTPUT environment
177 # variable.
178
179 # Do we want to change the working directory?
180 ifeq ("$(origin O)", "command line")
181 KBUILD_OUTPUT := $(O)
182 endif
183
184 ifneq ($(KBUILD_OUTPUT),)
185 # $(realpath ...) gets empty if the path does not exist. Run 'mkdir -p' first.
186 $(shell mkdir -p "$(KBUILD_OUTPUT)")
187 # $(realpath ...) resolves symlinks
188 abs_objtree := $(realpath $(KBUILD_OUTPUT))
189 $(if $(abs_objtree),,$(error failed to create output directory "$(KBUILD_OUTPUT)"))
190 endif # ifneq ($(KBUILD_OUTPUT),)
191
192 ifneq ($(words $(subst :, ,$(abs_srctree))), 1)
193 $(error source directory cannot contain spaces or colons)
194 endif
195
196 export sub_make_done := 1
197
198 endif # sub_make_done
199
200 ifeq ($(abs_objtree),$(CURDIR))
201 # Suppress "Entering directory ..." if we are at the final work directory.
202 no-print-directory := --no-print-directory
203 else
204 # Recursion to show "Entering directory ..."
205 need-sub-make := 1
206 endif
207
208 ifeq ($(filter --no-print-directory, $(MAKEFLAGS)),)
209 # If --no-print-directory is unset, recurse once again to set it.
210 # You may end up recursing into __sub-make twice. This is needed due to the
211 # behavior change in GNU Make 4.4.1.
212 need-sub-make := 1
213 endif
214
215 ifeq ($(need-sub-make),1)
216
217 PHONY += $(MAKECMDGOALS) __sub-make
218
219 $(filter-out $(this-makefile), $(MAKECMDGOALS)) __all: __sub-make
220 @:
221
222 # Invoke a second make in the output directory, passing relevant variables
223 __sub-make:
224 $(Q)$(MAKE) $(no-print-directory) -C $(abs_objtree) \
225 -f $(abs_srctree)/Makefile $(MAKECMDGOALS)
226
227 else # need-sub-make
228
229 # We process the rest of the Makefile if this is the final invocation of make
230
231 ifeq ($(abs_srctree),$(abs_objtree))
232 # building in the source tree
233 srctree := .
234 building_out_of_srctree :=
235 else
236 ifeq ($(abs_srctree)/,$(dir $(abs_objtree)))
237 # building in a subdirectory of the source tree
238 srctree := ..
239 else
240 srctree := $(abs_srctree)
241 endif
242 building_out_of_srctree := 1
243 endif
244
245 ifneq ($(KBUILD_ABS_SRCTREE),)
246 srctree := $(abs_srctree)
247 endif
248
249 objtree := .
250
251 VPATH :=
252
253 ifeq ($(KBUILD_EXTMOD),)
254 ifdef building_out_of_srctree
255 VPATH := $(srctree)
256 endif
257 endif
258
259 export building_out_of_srctree srctree objtree VPATH
260
261 # To make sure we do not include .config for any of the *config targets
262 # catch them early, and hand them over to scripts/kconfig/Makefile
263 # It is allowed to specify more targets when calling make, including
264 # mixing *config targets and build targets.
265 # For example 'make oldconfig all'.
266 # Detect when mixed targets is specified, and make a second invocation
267 # of make so .config is not included in this case either (for *config).
268
269 version_h := include/generated/uapi/linux/version.h
270
271 clean-targets := %clean mrproper cleandocs
272 no-dot-config-targets := $(clean-targets) \
273 cscope gtags TAGS tags help% %docs check% coccicheck \
274 $(version_h) headers headers_% archheaders archscripts \
275 %asm-generic kernelversion %src-pkg dt_binding_check \
276 outputmakefile rustavailable rustfmt rustfmtcheck
277 no-sync-config-targets := $(no-dot-config-targets) %install modules_sign kernelrelease \
278 image_name
279 single-targets := %.a %.i %.ko %.lds %.ll %.lst %.mod %.o %.rsi %.s %.symtypes %/
280
281 config-build :=
282 mixed-build :=
283 need-config := 1
284 may-sync-config := 1
285 single-build :=
286
287 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
288 ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
289 need-config :=
290 endif
291 endif
292
293 ifneq ($(filter $(no-sync-config-targets), $(MAKECMDGOALS)),)
294 ifeq ($(filter-out $(no-sync-config-targets), $(MAKECMDGOALS)),)
295 may-sync-config :=
296 endif
297 endif
298
299 need-compiler := $(may-sync-config)
300
301 ifneq ($(KBUILD_EXTMOD),)
302 may-sync-config :=
303 endif
304
305 ifeq ($(KBUILD_EXTMOD),)
306 ifneq ($(filter %config,$(MAKECMDGOALS)),)
307 config-build := 1
308 ifneq ($(words $(MAKECMDGOALS)),1)
309 mixed-build := 1
310 endif
311 endif
312 endif
313
314 # We cannot build single targets and the others at the same time
315 ifneq ($(filter $(single-targets), $(MAKECMDGOALS)),)
316 single-build := 1
317 ifneq ($(filter-out $(single-targets), $(MAKECMDGOALS)),)
318 mixed-build := 1
319 endif
320 endif
321
322 # For "make -j clean all", "make -j mrproper defconfig all", etc.
323 ifneq ($(filter $(clean-targets),$(MAKECMDGOALS)),)
324 ifneq ($(filter-out $(clean-targets),$(MAKECMDGOALS)),)
325 mixed-build := 1
326 endif
327 endif
328
329 # install and modules_install need also be processed one by one
330 ifneq ($(filter install,$(MAKECMDGOALS)),)
331 ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
332 mixed-build := 1
333 endif
334 endif
335
336 ifdef mixed-build
337 # ===========================================================================
338 # We're called with mixed targets (*config and build targets).
339 # Handle them one by one.
340
341 PHONY += $(MAKECMDGOALS) __build_one_by_one
342
343 $(MAKECMDGOALS): __build_one_by_one
344 @:
345
346 __build_one_by_one:
347 $(Q)set -e; \
348 for i in $(MAKECMDGOALS); do \
349 $(MAKE) -f $(srctree)/Makefile $$i; \
350 done
351
352 else # !mixed-build
353
354 include $(srctree)/scripts/Kbuild.include
355
356 # Read KERNELRELEASE from include/config/kernel.release (if it exists)
357 KERNELRELEASE = $(call read-file, include/config/kernel.release)
358 KERNELVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)
359 export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION
360
361 include $(srctree)/scripts/subarch.include
362
363 # Cross compiling and selecting different set of gcc/bin-utils
364 # ---------------------------------------------------------------------------
365 #
366 # When performing cross compilation for other architectures ARCH shall be set
367 # to the target architecture. (See arch/* for the possibilities).
368 # ARCH can be set during invocation of make:
369 # make ARCH=arm64
370 # Another way is to have ARCH set in the environment.
371 # The default ARCH is the host where make is executed.
372
373 # CROSS_COMPILE specify the prefix used for all executables used
374 # during compilation. Only gcc and related bin-utils executables
375 # are prefixed with $(CROSS_COMPILE).
376 # CROSS_COMPILE can be set on the command line
377 # make CROSS_COMPILE=aarch64-linux-gnu-
378 # Alternatively CROSS_COMPILE can be set in the environment.
379 # Default value for CROSS_COMPILE is not to prefix executables
380 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
381 ARCH ?= $(SUBARCH)
382
383 # Architecture as present in compile.h
384 UTS_MACHINE := $(ARCH)
385 SRCARCH := $(ARCH)
386
387 # Additional ARCH settings for x86
388 ifeq ($(ARCH),i386)
389 SRCARCH := x86
390 endif
391 ifeq ($(ARCH),x86_64)
392 SRCARCH := x86
393 endif
394
395 # Additional ARCH settings for sparc
396 ifeq ($(ARCH),sparc32)
397 SRCARCH := sparc
398 endif
399 ifeq ($(ARCH),sparc64)
400 SRCARCH := sparc
401 endif
402
403 # Additional ARCH settings for parisc
404 ifeq ($(ARCH),parisc64)
405 SRCARCH := parisc
406 endif
407
408 export cross_compiling :=
409 ifneq ($(SRCARCH),$(SUBARCH))
410 cross_compiling := 1
411 endif
412
413 KCONFIG_CONFIG ?= .config
414 export KCONFIG_CONFIG
415
416 # SHELL used by kbuild
417 CONFIG_SHELL := sh
418
419 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
420 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
421 HOST_LFS_LIBS := $(shell getconf LFS_LIBS 2>/dev/null)
422
423 ifneq ($(LLVM),)
424 ifneq ($(filter %/,$(LLVM)),)
425 LLVM_PREFIX := $(LLVM)
426 else ifneq ($(filter -%,$(LLVM)),)
427 LLVM_SUFFIX := $(LLVM)
428 endif
429
430 HOSTCC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
431 HOSTCXX = $(LLVM_PREFIX)clang++$(LLVM_SUFFIX)
432 else
433 HOSTCC = gcc
434 HOSTCXX = g++
435 endif
436 HOSTRUSTC = rustc
437 HOSTPKG_CONFIG = pkg-config
438
439 KBUILD_USERHOSTCFLAGS := -Wall -Wmissing-prototypes -Wstrict-prototypes \
440 -O2 -fomit-frame-pointer -std=gnu11
441 KBUILD_USERCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(USERCFLAGS)
442 KBUILD_USERLDFLAGS := $(USERLDFLAGS)
443
444 # These flags apply to all Rust code in the tree, including the kernel and
445 # host programs.
446 export rust_common_flags := --edition=2021 \
447 -Zbinary_dep_depinfo=y \
448 -Astable_features \
449 -Dunsafe_op_in_unsafe_fn \
450 -Dnon_ascii_idents \
451 -Wrust_2018_idioms \
452 -Wunreachable_pub \
453 -Wmissing_docs \
454 -Wrustdoc::missing_crate_level_docs \
455 -Wclippy::all \
456 -Wclippy::mut_mut \
457 -Wclippy::needless_bitwise_bool \
458 -Wclippy::needless_continue \
459 -Wclippy::no_mangle_with_rust_abi \
460 -Wclippy::dbg_macro
461
462 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
463 $(HOSTCFLAGS) -I $(srctree)/scripts/include
464 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
465 -I $(srctree)/scripts/include
466 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
467 -Zallow-features= $(HOSTRUSTFLAGS)
468 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
469 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
470
471 # Make variables (CC, etc...)
472 CPP = $(CC) -E
473 ifneq ($(LLVM),)
474 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
475 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
476 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
477 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
478 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
479 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
480 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
481 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
482 else
483 CC = $(CROSS_COMPILE)gcc
484 LD = $(CROSS_COMPILE)ld
485 AR = $(CROSS_COMPILE)ar
486 NM = $(CROSS_COMPILE)nm
487 OBJCOPY = $(CROSS_COMPILE)objcopy
488 OBJDUMP = $(CROSS_COMPILE)objdump
489 READELF = $(CROSS_COMPILE)readelf
490 STRIP = $(CROSS_COMPILE)strip
491 endif
492 RUSTC = rustc
493 RUSTDOC = rustdoc
494 RUSTFMT = rustfmt
495 CLIPPY_DRIVER = clippy-driver
496 BINDGEN = bindgen
497 PAHOLE = pahole
498 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
499 LEX = flex
500 YACC = bison
501 AWK = awk
502 INSTALLKERNEL := installkernel
503 PERL = perl
504 PYTHON3 = python3
505 CHECK = sparse
506 BASH = bash
507 KGZIP = gzip
508 KBZIP2 = bzip2
509 KLZOP = lzop
510 LZMA = lzma
511 LZ4 = lz4c
512 XZ = xz
513 ZSTD = zstd
514
515 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
516 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
517 NOSTDINC_FLAGS :=
518 CFLAGS_MODULE =
519 RUSTFLAGS_MODULE =
520 AFLAGS_MODULE =
521 LDFLAGS_MODULE =
522 CFLAGS_KERNEL =
523 RUSTFLAGS_KERNEL =
524 AFLAGS_KERNEL =
525 LDFLAGS_vmlinux =
526
527 # Use USERINCLUDE when you must reference the UAPI directories only.
528 USERINCLUDE := \
529 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
530 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
531 -I$(srctree)/include/uapi \
532 -I$(objtree)/include/generated/uapi \
533 -include $(srctree)/include/linux/compiler-version.h \
534 -include $(srctree)/include/linux/kconfig.h
535
536 # Use LINUXINCLUDE when you must reference the include/ directory.
537 # Needed to be compatible with the O= option
538 LINUXINCLUDE := \
539 -I$(srctree)/arch/$(SRCARCH)/include \
540 -I$(objtree)/arch/$(SRCARCH)/include/generated \
541 $(if $(building_out_of_srctree),-I$(srctree)/include) \
542 -I$(objtree)/include \
543 $(USERINCLUDE)
544
545 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
546
547 KBUILD_CFLAGS :=
548 KBUILD_CFLAGS += -std=gnu11
549 KBUILD_CFLAGS += -fshort-wchar
550 KBUILD_CFLAGS += -funsigned-char
551 KBUILD_CFLAGS += -fno-common
552 KBUILD_CFLAGS += -fno-PIE
553 KBUILD_CFLAGS += -fno-strict-aliasing
554
555 KBUILD_CPPFLAGS := -D__KERNEL__
556 KBUILD_RUSTFLAGS := $(rust_common_flags) \
557 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
558 -Cforce-unwind-tables=n -Ccodegen-units=1 \
559 -Csymbol-mangling-version=v0 \
560 -Crelocation-model=static \
561 -Zfunction-sections=n \
562 -Wclippy::float_arithmetic
563
564 KBUILD_AFLAGS_KERNEL :=
565 KBUILD_CFLAGS_KERNEL :=
566 KBUILD_RUSTFLAGS_KERNEL :=
567 KBUILD_AFLAGS_MODULE := -DMODULE
568 KBUILD_CFLAGS_MODULE := -DMODULE
569 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
570 KBUILD_LDFLAGS_MODULE :=
571 KBUILD_LDFLAGS :=
572 CLANG_FLAGS :=
573
574 ifeq ($(KBUILD_CLIPPY),1)
575 RUSTC_OR_CLIPPY_QUIET := CLIPPY
576 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
577 else
578 RUSTC_OR_CLIPPY_QUIET := RUSTC
579 RUSTC_OR_CLIPPY = $(RUSTC)
580 endif
581
582 ifdef RUST_LIB_SRC
583 export RUST_LIB_SRC
584 endif
585
586 # Allows the usage of unstable features in stable compilers.
587 export RUSTC_BOOTSTRAP := 1
588
589 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
590 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
591 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
592 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
593 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
594 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
595 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
596 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
597
598 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
599 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
600 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
601 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
602 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
603 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
604
605 # Files to ignore in find ... statements
606
607 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
608 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
609 -prune -o
610
611 # ===========================================================================
612 # Rules shared between *config targets and build targets
613
614 # Basic helpers built in scripts/basic/
615 PHONY += scripts_basic
616 scripts_basic:
617 $(Q)$(MAKE) $(build)=scripts/basic
618
619 PHONY += outputmakefile
620 ifdef building_out_of_srctree
621 # Before starting out-of-tree build, make sure the source tree is clean.
622 # outputmakefile generates a Makefile in the output directory, if using a
623 # separate output directory. This allows convenient use of make in the
624 # output directory.
625 # At the same time when output Makefile generated, generate .gitignore to
626 # ignore whole output directory
627
628 quiet_cmd_makefile = GEN Makefile
629 cmd_makefile = { \
630 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
631 echo "include $(srctree)/Makefile"; \
632 } > Makefile
633
634 outputmakefile:
635 @if [ -f $(srctree)/.config -o \
636 -d $(srctree)/include/config -o \
637 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
638 echo >&2 "***"; \
639 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
640 echo >&2 "*** in $(abs_srctree)";\
641 echo >&2 "***"; \
642 false; \
643 fi
644 $(Q)ln -fsn $(srctree) source
645 $(call cmd,makefile)
646 $(Q)test -e .gitignore || \
647 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
648 endif
649
650 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
651 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
652 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
653 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
654 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
655
656 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
657 include $(srctree)/scripts/Makefile.clang
658 endif
659
660 # Include this also for config targets because some architectures need
661 # cc-cross-prefix to determine CROSS_COMPILE.
662 ifdef need-compiler
663 include $(srctree)/scripts/Makefile.compiler
664 endif
665
666 ifdef config-build
667 # ===========================================================================
668 # *config targets only - make sure prerequisites are updated, and descend
669 # in scripts/kconfig to make the *config target
670
671 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
672 # KBUILD_DEFCONFIG may point out an alternative default configuration
673 # used for 'make defconfig'
674 include $(srctree)/arch/$(SRCARCH)/Makefile
675 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
676
677 config: outputmakefile scripts_basic FORCE
678 $(Q)$(MAKE) $(build)=scripts/kconfig $@
679
680 %config: outputmakefile scripts_basic FORCE
681 $(Q)$(MAKE) $(build)=scripts/kconfig $@
682
683 else #!config-build
684 # ===========================================================================
685 # Build targets only - this includes vmlinux, arch-specific targets, clean
686 # targets and others. In general all targets except *config targets.
687
688 # If building an external module we do not care about the all: rule
689 # but instead __all depend on modules
690 PHONY += all
691 ifeq ($(KBUILD_EXTMOD),)
692 __all: all
693 else
694 __all: modules
695 endif
696
697 targets :=
698
699 # Decide whether to build built-in, modular, or both.
700 # Normally, just do built-in.
701
702 KBUILD_MODULES :=
703 KBUILD_BUILTIN := 1
704
705 # If we have only "make modules", don't compile built-in objects.
706 ifeq ($(MAKECMDGOALS),modules)
707 KBUILD_BUILTIN :=
708 endif
709
710 # If we have "make <whatever> modules", compile modules
711 # in addition to whatever we do anyway.
712 # Just "make" or "make all" shall build modules as well
713
714 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
715 KBUILD_MODULES := 1
716 endif
717
718 ifeq ($(MAKECMDGOALS),)
719 KBUILD_MODULES := 1
720 endif
721
722 export KBUILD_MODULES KBUILD_BUILTIN
723
724 ifdef need-config
725 include include/config/auto.conf
726 endif
727
728 ifeq ($(KBUILD_EXTMOD),)
729 # Objects we will link into vmlinux / subdirs we need to visit
730 core-y :=
731 drivers-y :=
732 libs-y := lib/
733 endif # KBUILD_EXTMOD
734
735 # The all: target is the default when no target is given on the
736 # command line.
737 # This allow a user to issue only 'make' to build a kernel including modules
738 # Defaults to vmlinux, but the arch makefile usually adds further targets
739 all: vmlinux
740
741 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
742 ifdef CONFIG_CC_IS_GCC
743 CFLAGS_GCOV += -fno-tree-loop-im
744 endif
745 export CFLAGS_GCOV
746
747 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
748 ifdef CONFIG_FUNCTION_TRACER
749 CC_FLAGS_FTRACE := -pg
750 endif
751
752 include $(srctree)/arch/$(SRCARCH)/Makefile
753
754 ifdef need-config
755 ifdef may-sync-config
756 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
757 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
758 # because some architectures define CROSS_COMPILE there.
759 include include/config/auto.conf.cmd
760
761 $(KCONFIG_CONFIG):
762 @echo >&2 '***'
763 @echo >&2 '*** Configuration file "$@" not found!'
764 @echo >&2 '***'
765 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
766 @echo >&2 '*** "make menuconfig" or "make xconfig").'
767 @echo >&2 '***'
768 @/bin/false
769
770 # The actual configuration files used during the build are stored in
771 # include/generated/ and include/config/. Update them if .config is newer than
772 # include/config/auto.conf (which mirrors .config).
773 #
774 # This exploits the 'multi-target pattern rule' trick.
775 # The syncconfig should be executed only once to make all the targets.
776 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
777 #
778 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
779 # so you cannot notice that Kconfig is waiting for the user input.
780 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
781 $(Q)$(kecho) " SYNC $@"
782 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
783 else # !may-sync-config
784 # External modules and some install targets need include/generated/autoconf.h
785 # and include/config/auto.conf but do not care if they are up-to-date.
786 # Use auto.conf to trigger the test
787 PHONY += include/config/auto.conf
788
789 include/config/auto.conf:
790 @test -e include/generated/autoconf.h -a -e $@ || ( \
791 echo >&2; \
792 echo >&2 " ERROR: Kernel configuration is invalid."; \
793 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
794 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
795 echo >&2 ; \
796 /bin/false)
797
798 endif # may-sync-config
799 endif # need-config
800
801 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
802
803 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
804 KBUILD_CFLAGS += -O2
805 KBUILD_RUSTFLAGS += -Copt-level=2
806 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
807 KBUILD_CFLAGS += -Os
808 KBUILD_RUSTFLAGS += -Copt-level=s
809 endif
810
811 # Always set `debug-assertions` and `overflow-checks` because their default
812 # depends on `opt-level` and `debug-assertions`, respectively.
813 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
814 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
815
816 # Tell gcc to never replace conditional load with a non-conditional one
817 ifdef CONFIG_CC_IS_GCC
818 # gcc-10 renamed --param=allow-store-data-races=0 to
819 # -fno-allow-store-data-races.
820 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
821 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
822 endif
823
824 ifdef CONFIG_READABLE_ASM
825 # Disable optimizations that make assembler listings hard to read.
826 # reorder blocks reorders the control in the function
827 # ipa clone creates specialized cloned functions
828 # partial inlining inlines only parts of functions
829 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
830 endif
831
832 stackp-flags-y := -fno-stack-protector
833 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
834 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
835
836 KBUILD_CFLAGS += $(stackp-flags-y)
837
838 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
839 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
840
841 ifdef CONFIG_FRAME_POINTER
842 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
843 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
844 else
845 # Some targets (ARM with Thumb2, for example), can't be built with frame
846 # pointers. For those, we don't have FUNCTION_TRACER automatically
847 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
848 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
849 # -fomit-frame-pointer with FUNCTION_TRACER.
850 # In the Rust target specification, "frame-pointer" is set explicitly
851 # to "may-omit".
852 ifndef CONFIG_FUNCTION_TRACER
853 KBUILD_CFLAGS += -fomit-frame-pointer
854 endif
855 endif
856
857 # Initialize all stack variables with a 0xAA pattern.
858 ifdef CONFIG_INIT_STACK_ALL_PATTERN
859 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
860 endif
861
862 # Initialize all stack variables with a zero value.
863 ifdef CONFIG_INIT_STACK_ALL_ZERO
864 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
865 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
866 # https://github.com/llvm/llvm-project/issues/44842
867 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
868 export CC_AUTO_VAR_INIT_ZERO_ENABLER
869 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
870 endif
871 endif
872
873 # While VLAs have been removed, GCC produces unreachable stack probes
874 # for the randomize_kstack_offset feature. Disable it for all compilers.
875 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
876
877 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
878 ifdef CONFIG_ZERO_CALL_USED_REGS
879 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
880 endif
881
882 ifdef CONFIG_FUNCTION_TRACER
883 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
884 CC_FLAGS_FTRACE += -mrecord-mcount
885 ifdef CONFIG_HAVE_NOP_MCOUNT
886 ifeq ($(call cc-option-yn, -mnop-mcount),y)
887 CC_FLAGS_FTRACE += -mnop-mcount
888 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
889 endif
890 endif
891 endif
892 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
893 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
894 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
895 endif
896 endif
897 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
898 ifdef CONFIG_HAVE_C_RECORDMCOUNT
899 BUILD_C_RECORDMCOUNT := y
900 export BUILD_C_RECORDMCOUNT
901 endif
902 endif
903 ifdef CONFIG_HAVE_FENTRY
904 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
905 ifeq ($(call cc-option-yn, -mfentry),y)
906 CC_FLAGS_FTRACE += -mfentry
907 CC_FLAGS_USING += -DCC_USING_FENTRY
908 endif
909 endif
910 export CC_FLAGS_FTRACE
911 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
912 KBUILD_AFLAGS += $(CC_FLAGS_USING)
913 endif
914
915 # We trigger additional mismatches with less inlining
916 ifdef CONFIG_DEBUG_SECTION_MISMATCH
917 KBUILD_CFLAGS += -fno-inline-functions-called-once
918 endif
919
920 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
921 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
922 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
923 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
924 LDFLAGS_vmlinux += --gc-sections
925 endif
926
927 ifdef CONFIG_SHADOW_CALL_STACK
928 ifndef CONFIG_DYNAMIC_SCS
929 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
930 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
931 endif
932 export CC_FLAGS_SCS
933 endif
934
935 ifdef CONFIG_LTO_CLANG
936 ifdef CONFIG_LTO_CLANG_THIN
937 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
938 else
939 CC_FLAGS_LTO := -flto
940 endif
941 CC_FLAGS_LTO += -fvisibility=hidden
942
943 # Limit inlining across translation units to reduce binary size
944 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
945 endif
946
947 ifdef CONFIG_LTO
948 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
949 KBUILD_AFLAGS += -fno-lto
950 export CC_FLAGS_LTO
951 endif
952
953 ifdef CONFIG_CFI_CLANG
954 CC_FLAGS_CFI := -fsanitize=kcfi
955 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
956 export CC_FLAGS_CFI
957 endif
958
959 # Architectures can define flags to add/remove for floating-point support
960 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT
961 export CC_FLAGS_FPU
962 export CC_FLAGS_NO_FPU
963
964 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
965 # Set the minimal function alignment. Use the newer GCC option
966 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
967 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
968 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
969 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
970 else
971 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
972 endif
973 endif
974
975 # arch Makefile may override CC so keep this after arch Makefile is included
976 NOSTDINC_FLAGS += -nostdinc
977
978 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
979 # the kernel uses only C99 flexible arrays for dynamically sized trailing
980 # arrays. Enforce this for everything that may examine structure sizes and
981 # perform bounds checking.
982 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
983
984 #Currently, disable -Wstringop-overflow for GCC 11, globally.
985 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
986 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
987
988 # disable invalid "can't wrap" optimizations for signed / pointers
989 KBUILD_CFLAGS += -fno-strict-overflow
990
991 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
992 KBUILD_CFLAGS += -fno-stack-check
993
994 # conserve stack if available
995 ifdef CONFIG_CC_IS_GCC
996 KBUILD_CFLAGS += -fconserve-stack
997 endif
998
999 # change __FILE__ to the relative path from the srctree
1000 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1001
1002 # include additional Makefiles when needed
1003 include-y := scripts/Makefile.extrawarn
1004 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1005 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1006 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1007 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1008 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1009 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1010 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1011 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1012 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1013
1014 include $(addprefix $(srctree)/, $(include-y))
1015
1016 # scripts/Makefile.gcc-plugins is intentionally included last.
1017 # Do not add $(call cc-option,...) below this line. When you build the kernel
1018 # from the clean source tree, the GCC plugins do not exist at this point.
1019
1020 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1021 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1022 KBUILD_AFLAGS += $(KAFLAGS)
1023 KBUILD_CFLAGS += $(KCFLAGS)
1024 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1025
1026 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1027 LDFLAGS_vmlinux += --build-id=sha1
1028
1029 KBUILD_LDFLAGS += -z noexecstack
1030 ifeq ($(CONFIG_LD_IS_BFD),y)
1031 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1032 endif
1033
1034 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1035 LDFLAGS_vmlinux += -X
1036 endif
1037
1038 ifeq ($(CONFIG_RELR),y)
1039 # ld.lld before 15 did not support -z pack-relative-relocs.
1040 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1041 endif
1042
1043 # We never want expected sections to be placed heuristically by the
1044 # linker. All sections should be explicitly named in the linker script.
1045 ifdef CONFIG_LD_ORPHAN_WARN
1046 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1047 endif
1048
1049 # Align the bit size of userspace programs with the kernel
1050 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1051 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1052
1053 # make the checker run with the right architecture
1054 CHECKFLAGS += --arch=$(ARCH)
1055
1056 # insure the checker run with the right endianness
1057 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1058
1059 # the checker needs the correct machine size
1060 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1061
1062 # Default kernel image to build when no specific target is given.
1063 # KBUILD_IMAGE may be overruled on the command line or
1064 # set in the environment
1065 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1066 # this default value
1067 export KBUILD_IMAGE ?= vmlinux
1068
1069 #
1070 # INSTALL_PATH specifies where to place the updated kernel and system map
1071 # images. Default is /boot, but you can set it to other values
1072 export INSTALL_PATH ?= /boot
1073
1074 #
1075 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1076 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1077 # an argument if needed. Otherwise it defaults to the kernel install path
1078 #
1079 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1080
1081 #
1082 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1083 # relocations required by build roots. This is not defined in the
1084 # makefile but the argument can be passed to make if needed.
1085 #
1086
1087 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1088 export MODLIB
1089
1090 PHONY += prepare0
1091
1092 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1093 export MODORDER := $(extmod_prefix)modules.order
1094 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1095
1096 ifeq ($(KBUILD_EXTMOD),)
1097
1098 build-dir := .
1099 clean-dirs := $(sort . Documentation \
1100 $(patsubst %/,%,$(filter %/, $(core-) \
1101 $(drivers-) $(libs-))))
1102
1103 export ARCH_CORE := $(core-y)
1104 export ARCH_LIB := $(filter %/, $(libs-y))
1105 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1106 # Externally visible symbols (used by link-vmlinux.sh)
1107
1108 KBUILD_VMLINUX_OBJS := ./built-in.a
1109 ifdef CONFIG_MODULES
1110 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1111 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1112 else
1113 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1114 endif
1115
1116 export KBUILD_VMLINUX_LIBS
1117 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1118
1119 ifdef CONFIG_TRIM_UNUSED_KSYMS
1120 # For the kernel to actually contain only the needed exported symbols,
1121 # we have to build modules as well to determine what those symbols are.
1122 KBUILD_MODULES := 1
1123 endif
1124
1125 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1126 quiet_cmd_ar_vmlinux.a = AR $@
1127 cmd_ar_vmlinux.a = \
1128 rm -f $@; \
1129 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1130 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1131
1132 targets += vmlinux.a
1133 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1134 $(call if_changed,ar_vmlinux.a)
1135
1136 PHONY += vmlinux_o
1137 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1138 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1139
1140 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1141 @:
1142
1143 PHONY += vmlinux
1144 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1145 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1146 # unrelated; the decompressors just happen to have the same base name,
1147 # arch/*/boot/compressed/vmlinux.
1148 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1149 #
1150 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1151 # https://savannah.gnu.org/bugs/?61463
1152 # For Make > 4.4, the following simple code will work:
1153 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1154 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1155 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1156 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1157 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1158
1159 # The actual objects are generated when descending,
1160 # make sure no implicit rule kicks in
1161 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1162
1163 ifeq ($(origin KERNELRELEASE),file)
1164 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1165 else
1166 filechk_kernel.release = echo $(KERNELRELEASE)
1167 endif
1168
1169 # Store (new) KERNELRELEASE string in include/config/kernel.release
1170 include/config/kernel.release: FORCE
1171 $(call filechk,kernel.release)
1172
1173 # Additional helpers built in scripts/
1174 # Carefully list dependencies so we do not try to build scripts twice
1175 # in parallel
1176 PHONY += scripts
1177 scripts: scripts_basic scripts_dtc
1178 $(Q)$(MAKE) $(build)=$(@)
1179
1180 # Things we need to do before we recursively start building the kernel
1181 # or the modules are listed in "prepare".
1182 # A multi level approach is used. prepareN is processed before prepareN-1.
1183 # archprepare is used in arch Makefiles and when processed asm symlink,
1184 # version.h and scripts_basic is processed / created.
1185
1186 PHONY += prepare archprepare
1187
1188 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1189 asm-generic $(version_h) include/generated/utsrelease.h \
1190 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1191
1192 prepare0: archprepare
1193 $(Q)$(MAKE) $(build)=scripts/mod
1194 $(Q)$(MAKE) $(build)=. prepare
1195
1196 # All the preparing..
1197 prepare: prepare0
1198 ifdef CONFIG_RUST
1199 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1200 $(Q)$(MAKE) $(build)=rust
1201 endif
1202
1203 PHONY += remove-stale-files
1204 remove-stale-files:
1205 $(Q)$(srctree)/scripts/remove-stale-files
1206
1207 # Support for using generic headers in asm-generic
1208 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1209
1210 PHONY += asm-generic uapi-asm-generic
1211 asm-generic: uapi-asm-generic
1212 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1213 generic=include/asm-generic
1214 uapi-asm-generic:
1215 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1216 generic=include/uapi/asm-generic
1217
1218 # Generate some files
1219 # ---------------------------------------------------------------------------
1220
1221 # KERNELRELEASE can change from a few different places, meaning version.h
1222 # needs to be updated, so this check is forced on all builds
1223
1224 uts_len := 64
1225 define filechk_utsrelease.h
1226 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1227 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1228 exit 1; \
1229 fi; \
1230 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1231 endef
1232
1233 define filechk_version.h
1234 if [ $(SUBLEVEL) -gt 255 ]; then \
1235 echo \#define LINUX_VERSION_CODE $(shell \
1236 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1237 else \
1238 echo \#define LINUX_VERSION_CODE $(shell \
1239 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1240 fi; \
1241 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1242 ((c) > 255 ? 255 : (c)))'; \
1243 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1244 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1245 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1246 endef
1247
1248 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1249 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1250 $(version_h): FORCE
1251 $(call filechk,version.h)
1252
1253 include/generated/utsrelease.h: include/config/kernel.release FORCE
1254 $(call filechk,utsrelease.h)
1255
1256 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1257 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1258
1259 include/generated/compile.h: FORCE
1260 $(call filechk,compile.h)
1261
1262 PHONY += headerdep
1263 headerdep:
1264 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1265 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1266
1267 # ---------------------------------------------------------------------------
1268 # Kernel headers
1269
1270 #Default location for installed headers
1271 export INSTALL_HDR_PATH = $(objtree)/usr
1272
1273 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1274 cmd_headers_install = \
1275 mkdir -p $(INSTALL_HDR_PATH); \
1276 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1277 usr/include $(INSTALL_HDR_PATH)
1278
1279 PHONY += headers_install
1280 headers_install: headers
1281 $(call cmd,headers_install)
1282
1283 PHONY += archheaders archscripts
1284
1285 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1286
1287 PHONY += headers
1288 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1289 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1290 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1291 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1292
1293 ifdef CONFIG_HEADERS_INSTALL
1294 prepare: headers
1295 endif
1296
1297 PHONY += scripts_unifdef
1298 scripts_unifdef: scripts_basic
1299 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1300
1301 # ---------------------------------------------------------------------------
1302 # Install
1303
1304 # Many distributions have the custom install script, /sbin/installkernel.
1305 # If DKMS is installed, 'make install' will eventually recurse back
1306 # to this Makefile to build and install external modules.
1307 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1308
1309 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1310 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1311
1312 # ---------------------------------------------------------------------------
1313 # vDSO install
1314
1315 PHONY += vdso_install
1316 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1317 vdso_install:
1318 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1319
1320 # ---------------------------------------------------------------------------
1321 # Tools
1322
1323 ifdef CONFIG_OBJTOOL
1324 prepare: tools/objtool
1325 endif
1326
1327 ifdef CONFIG_BPF
1328 ifdef CONFIG_DEBUG_INFO_BTF
1329 prepare: tools/bpf/resolve_btfids
1330 endif
1331 endif
1332
1333 # The tools build system is not a part of Kbuild and tends to introduce
1334 # its own unique issues. If you need to integrate a new tool into Kbuild,
1335 # please consider locating that tool outside the tools/ tree and using the
1336 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1337 # here. See Documentation/kbuild/makefiles.rst for details.
1338
1339 PHONY += resolve_btfids_clean
1340
1341 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1342
1343 # tools/bpf/resolve_btfids directory might not exist
1344 # in output directory, skip its clean in that case
1345 resolve_btfids_clean:
1346 ifneq ($(wildcard $(resolve_btfids_O)),)
1347 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1348 endif
1349
1350 # Clear a bunch of variables before executing the submake
1351 ifeq ($(quiet),silent_)
1352 tools_silent=s
1353 endif
1354
1355 tools/: FORCE
1356 $(Q)mkdir -p $(objtree)/tools
1357 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1358
1359 tools/%: FORCE
1360 $(Q)mkdir -p $(objtree)/tools
1361 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1362
1363 # ---------------------------------------------------------------------------
1364 # Kernel selftest
1365
1366 PHONY += kselftest
1367 kselftest: headers
1368 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1369
1370 kselftest-%: headers FORCE
1371 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1372
1373 PHONY += kselftest-merge
1374 kselftest-merge:
1375 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1376 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1377 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1378 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1379
1380 # ---------------------------------------------------------------------------
1381 # Devicetree files
1382
1383 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1384 dtstree := arch/$(SRCARCH)/boot/dts
1385 endif
1386
1387 ifneq ($(dtstree),)
1388
1389 %.dtb: dtbs_prepare
1390 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1391
1392 %.dtbo: dtbs_prepare
1393 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1394
1395 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1396 dtbs: dtbs_prepare
1397 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1398
1399 # include/config/kernel.release is actually needed when installing DTBs because
1400 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1401 # dtbs_install depend on it as dtbs_install may run as root.
1402 dtbs_prepare: include/config/kernel.release scripts_dtc
1403
1404 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1405 export CHECK_DTBS=y
1406 endif
1407
1408 ifneq ($(CHECK_DTBS),)
1409 dtbs_prepare: dt_binding_schemas
1410 endif
1411
1412 dtbs_check: dtbs
1413
1414 dtbs_install:
1415 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1416
1417 ifdef CONFIG_OF_EARLY_FLATTREE
1418 all: dtbs
1419 endif
1420
1421 endif
1422
1423 PHONY += scripts_dtc
1424 scripts_dtc: scripts_basic
1425 $(Q)$(MAKE) $(build)=scripts/dtc
1426
1427 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1428 export CHECK_DTBS=y
1429 endif
1430
1431 PHONY += dt_binding_check dt_binding_schemas
1432 dt_binding_check: dt_binding_schemas scripts_dtc
1433 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1434
1435 dt_binding_schemas:
1436 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1437
1438 PHONY += dt_compatible_check
1439 dt_compatible_check: dt_binding_schemas
1440 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1441
1442 # ---------------------------------------------------------------------------
1443 # Modules
1444
1445 ifdef CONFIG_MODULES
1446
1447 # By default, build modules as well
1448
1449 all: modules
1450
1451 # When we're building modules with modversions, we need to consider
1452 # the built-in objects during the descend as well, in order to
1453 # make sure the checksums are up to date before we record them.
1454 ifdef CONFIG_MODVERSIONS
1455 KBUILD_BUILTIN := 1
1456 endif
1457
1458 # Build modules
1459 #
1460
1461 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1462 # is an exception.
1463 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1464 KBUILD_BUILTIN := 1
1465 modules: vmlinux
1466 endif
1467
1468 modules: modules_prepare
1469
1470 # Target to prepare building external modules
1471 modules_prepare: prepare
1472 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1473
1474 endif # CONFIG_MODULES
1475
1476 ###
1477 # Cleaning is done on three levels.
1478 # make clean Delete most generated files
1479 # Leave enough to build external modules
1480 # make mrproper Delete the current configuration, and all generated files
1481 # make distclean Remove editor backup files, patch leftover files and the like
1482
1483 # Directories & files removed with 'make clean'
1484 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1485 modules.builtin modules.builtin.modinfo modules.nsdeps \
1486 compile_commands.json rust/test \
1487 rust-project.json .vmlinux.objs .vmlinux.export.c
1488
1489 # Directories & files removed with 'make mrproper'
1490 MRPROPER_FILES += include/config include/generated \
1491 arch/$(SRCARCH)/include/generated .objdiff \
1492 debian snap tar-install PKGBUILD pacman \
1493 .config .config.old .version \
1494 Module.symvers \
1495 certs/signing_key.pem \
1496 certs/x509.genkey \
1497 vmlinux-gdb.py \
1498 rpmbuild \
1499 rust/libmacros.so
1500
1501 # clean - Delete most, but leave enough to build external modules
1502 #
1503 clean: private rm-files := $(CLEAN_FILES)
1504
1505 PHONY += archclean vmlinuxclean
1506
1507 vmlinuxclean:
1508 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1509 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1510
1511 clean: archclean vmlinuxclean resolve_btfids_clean
1512
1513 # mrproper - Delete all generated files, including .config
1514 #
1515 mrproper: private rm-files := $(MRPROPER_FILES)
1516 mrproper-dirs := $(addprefix _mrproper_,scripts)
1517
1518 PHONY += $(mrproper-dirs) mrproper
1519 $(mrproper-dirs):
1520 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1521
1522 mrproper: clean $(mrproper-dirs)
1523 $(call cmd,rmfiles)
1524 @find . $(RCS_FIND_IGNORE) \
1525 \( -name '*.rmeta' \) \
1526 -type f -print | xargs rm -f
1527
1528 # distclean
1529 #
1530 PHONY += distclean
1531
1532 distclean: mrproper
1533 @find . $(RCS_FIND_IGNORE) \
1534 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1535 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1536 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1537 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1538 -type f -print | xargs rm -f
1539
1540
1541 # Packaging of the kernel to various formats
1542 # ---------------------------------------------------------------------------
1543
1544 %src-pkg: FORCE
1545 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1546 %pkg: include/config/kernel.release FORCE
1547 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1548
1549 # Brief documentation of the typical targets used
1550 # ---------------------------------------------------------------------------
1551
1552 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1553 boards := $(sort $(notdir $(boards)))
1554 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1555 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1556
1557 PHONY += help
1558 help:
1559 @echo 'Cleaning targets:'
1560 @echo ' clean - Remove most generated files but keep the config and'
1561 @echo ' enough build support to build external modules'
1562 @echo ' mrproper - Remove all generated files + config + various backup files'
1563 @echo ' distclean - mrproper + remove editor backup and patch files'
1564 @echo ''
1565 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1566 @echo ''
1567 @echo 'Other generic targets:'
1568 @echo ' all - Build all targets marked with [*]'
1569 @echo '* vmlinux - Build the bare kernel'
1570 @echo '* modules - Build all modules'
1571 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1572 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1573 @echo ' dir/ - Build all files in dir and below'
1574 @echo ' dir/file.[ois] - Build specified target only'
1575 @echo ' dir/file.ll - Build the LLVM assembly file'
1576 @echo ' (requires compiler support for LLVM assembly generation)'
1577 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1578 @echo ' (requires a recent binutils and recent build (System.map))'
1579 @echo ' dir/file.ko - Build module including final link'
1580 @echo ' modules_prepare - Set up for building external modules'
1581 @echo ' tags/TAGS - Generate tags file for editors'
1582 @echo ' cscope - Generate cscope index'
1583 @echo ' gtags - Generate GNU GLOBAL index'
1584 @echo ' kernelrelease - Output the release version string (use with make -s)'
1585 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1586 @echo ' image_name - Output the image name (use with make -s)'
1587 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1588 echo ' (default: $(INSTALL_HDR_PATH))'; \
1589 echo ''
1590 @echo 'Static analysers:'
1591 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1592 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1593 @echo ' versioncheck - Sanity check on version.h usage'
1594 @echo ' includecheck - Check for duplicate included header files'
1595 @echo ' export_report - List the usages of all exported symbols'
1596 @echo ' headerdep - Detect inclusion cycles in headers'
1597 @echo ' coccicheck - Check with Coccinelle'
1598 @echo ' clang-analyzer - Check with clang static analyzer'
1599 @echo ' clang-tidy - Check with clang-tidy'
1600 @echo ''
1601 @echo 'Tools:'
1602 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1603 @echo ''
1604 @echo 'Kernel selftest:'
1605 @echo ' kselftest - Build and run kernel selftest'
1606 @echo ' Build, install, and boot kernel before'
1607 @echo ' running kselftest on it'
1608 @echo ' Run as root for full coverage'
1609 @echo ' kselftest-all - Build kernel selftest'
1610 @echo ' kselftest-install - Build and install kernel selftest'
1611 @echo ' kselftest-clean - Remove all generated kselftest files'
1612 @echo ' kselftest-merge - Merge all the config dependencies of'
1613 @echo ' kselftest to existing .config.'
1614 @echo ''
1615 @echo 'Rust targets:'
1616 @echo ' rustavailable - Checks whether the Rust toolchain is'
1617 @echo ' available and, if not, explains why.'
1618 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1619 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1620 @echo ' is formatted, printing a diff otherwise.'
1621 @echo ' rustdoc - Generate Rust documentation'
1622 @echo ' (requires kernel .config)'
1623 @echo ' rusttest - Runs the Rust tests'
1624 @echo ' (requires kernel .config; downloads external repos)'
1625 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1626 @echo ' (requires kernel .config)'
1627 @echo ' dir/file.[os] - Build specified target only'
1628 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1629 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1630 @echo ' The output is not intended to be compilable.'
1631 @echo ' dir/file.ll - Build the LLVM assembly file'
1632 @echo ''
1633 @$(if $(dtstree), \
1634 echo 'Devicetree:'; \
1635 echo '* dtbs - Build device tree blobs for enabled boards'; \
1636 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1637 echo ' dt_binding_check - Validate device tree binding documents and examples'; \
1638 echo ' dt_binding_schema - Build processed device tree binding schemas'; \
1639 echo ' dtbs_check - Validate device tree source files';\
1640 echo '')
1641
1642 @echo 'Userspace tools targets:'
1643 @echo ' use "make tools/help"'
1644 @echo ' or "cd tools; make help"'
1645 @echo ''
1646 @echo 'Kernel packaging:'
1647 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1648 @echo ''
1649 @echo 'Documentation targets:'
1650 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1651 @echo ''
1652 @echo 'Architecture-specific targets ($(SRCARCH)):'
1653 @$(or $(archhelp),\
1654 echo ' No architecture-specific help defined for $(SRCARCH)')
1655 @echo ''
1656 @$(if $(boards), \
1657 $(foreach b, $(boards), \
1658 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1659 echo '')
1660 @$(if $(board-dirs), \
1661 $(foreach b, $(board-dirs), \
1662 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1663 printf " %-16s - Show all of the above\\n" help-boards; \
1664 echo '')
1665
1666 @echo ' make V=n [targets] 1: verbose build'
1667 @echo ' 2: give reason for rebuild of target'
1668 @echo ' V=1 and V=2 can be combined with V=12'
1669 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1670 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1671 @echo ' (sparse by default)'
1672 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1673 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1674 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1675 @echo ' 1: warnings which may be relevant and do not occur too often'
1676 @echo ' 2: warnings which occur quite often but may still be relevant'
1677 @echo ' 3: more obscure warnings, can most likely be ignored'
1678 @echo ' c: extra checks in the configuration stage (Kconfig)'
1679 @echo ' e: warnings are being treated as errors'
1680 @echo ' Multiple levels can be combined with W=12 or W=123'
1681 @$(if $(dtstree), \
1682 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1683 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1684 )
1685 @echo ''
1686 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1687 @echo 'For further info see the ./README file'
1688
1689
1690 help-board-dirs := $(addprefix help-,$(board-dirs))
1691
1692 help-boards: $(help-board-dirs)
1693
1694 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1695
1696 $(help-board-dirs): help-%:
1697 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1698 @$(if $(boards-per-dir), \
1699 $(foreach b, $(boards-per-dir), \
1700 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1701 echo '')
1702
1703
1704 # Documentation targets
1705 # ---------------------------------------------------------------------------
1706 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1707 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1708 PHONY += $(DOC_TARGETS)
1709 $(DOC_TARGETS):
1710 $(Q)$(MAKE) $(build)=Documentation $@
1711
1712
1713 # Rust targets
1714 # ---------------------------------------------------------------------------
1715
1716 # "Is Rust available?" target
1717 PHONY += rustavailable
1718 rustavailable:
1719 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1720
1721 # Documentation target
1722 #
1723 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1724 PHONY += rustdoc
1725 rustdoc: prepare
1726 $(Q)$(MAKE) $(build)=rust $@
1727
1728 # Testing target
1729 PHONY += rusttest
1730 rusttest: prepare
1731 $(Q)$(MAKE) $(build)=rust $@
1732
1733 # Formatting targets
1734 PHONY += rustfmt rustfmtcheck
1735
1736 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1737 #
1738 # We match using absolute paths since `find` does not resolve them
1739 # when matching, which is a problem when e.g. `srctree` is `..`.
1740 # We `grep` afterwards in order to remove the directory entry itself.
1741 rustfmt:
1742 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1743 -o -path $(abs_srctree)/rust/alloc -prune \
1744 -o -path $(abs_objtree)/rust/test -prune \
1745 | grep -Fv $(abs_srctree)/rust/alloc \
1746 | grep -Fv $(abs_objtree)/rust/test \
1747 | grep -Fv generated \
1748 | xargs $(RUSTFMT) $(rustfmt_flags)
1749
1750 rustfmtcheck: rustfmt_flags = --check
1751 rustfmtcheck: rustfmt
1752
1753 # Misc
1754 # ---------------------------------------------------------------------------
1755
1756 PHONY += misc-check
1757 misc-check:
1758 $(Q)$(srctree)/scripts/misc-check
1759
1760 all: misc-check
1761
1762 PHONY += scripts_gdb
1763 scripts_gdb: prepare0
1764 $(Q)$(MAKE) $(build)=scripts/gdb
1765 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1766
1767 ifdef CONFIG_GDB_SCRIPTS
1768 all: scripts_gdb
1769 endif
1770
1771 else # KBUILD_EXTMOD
1772
1773 filechk_kernel.release = echo $(KERNELRELEASE)
1774
1775 ###
1776 # External module support.
1777 # When building external modules the kernel used as basis is considered
1778 # read-only, and no consistency checks are made and the make
1779 # system is not used on the basis kernel. If updates are required
1780 # in the basis kernel ordinary make commands (without M=...) must be used.
1781
1782 # We are always building only modules.
1783 KBUILD_BUILTIN :=
1784 KBUILD_MODULES := 1
1785
1786 build-dir := $(KBUILD_EXTMOD)
1787
1788 compile_commands.json: $(extmod_prefix)compile_commands.json
1789 PHONY += compile_commands.json
1790
1791 clean-dirs := $(KBUILD_EXTMOD)
1792 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1793 $(KBUILD_EXTMOD)/compile_commands.json
1794
1795 PHONY += prepare
1796 # now expand this into a simple variable to reduce the cost of shell evaluations
1797 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1798 prepare:
1799 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1800 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1801 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1802 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1803 fi
1804
1805 PHONY += help
1806 help:
1807 @echo ' Building external modules.'
1808 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1809 @echo ''
1810 @echo ' modules - default target, build the module(s)'
1811 @echo ' modules_install - install the module'
1812 @echo ' clean - remove generated files in module directory only'
1813 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1814 @echo ''
1815
1816 ifndef CONFIG_MODULES
1817 modules modules_install: __external_modules_error
1818 __external_modules_error:
1819 @echo >&2 '***'
1820 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1821 @echo >&2 '*** You cannot build or install external modules.'
1822 @echo >&2 '***'
1823 @false
1824 endif
1825
1826 endif # KBUILD_EXTMOD
1827
1828 # ---------------------------------------------------------------------------
1829 # Modules
1830
1831 PHONY += modules modules_install modules_sign modules_prepare
1832
1833 modules_install:
1834 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1835 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1836
1837 ifeq ($(CONFIG_MODULE_SIG),y)
1838 # modules_sign is a subset of modules_install.
1839 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1840 modules_sign: modules_install
1841 @:
1842 else
1843 modules_sign:
1844 @echo >&2 '***'
1845 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1846 @echo >&2 '***'
1847 @false
1848 endif
1849
1850 ifdef CONFIG_MODULES
1851
1852 $(MODORDER): $(build-dir)
1853 @:
1854
1855 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1856 # This is solely useful to speed up test compiles.
1857 modules: modpost
1858 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1859 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1860 endif
1861
1862 PHONY += modules_check
1863 modules_check: $(MODORDER)
1864 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1865
1866 else # CONFIG_MODULES
1867
1868 modules:
1869 @:
1870
1871 KBUILD_MODULES :=
1872
1873 endif # CONFIG_MODULES
1874
1875 PHONY += modpost
1876 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1877 $(if $(KBUILD_MODULES), modules_check)
1878 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1879
1880 # Single targets
1881 # ---------------------------------------------------------------------------
1882 # To build individual files in subdirectories, you can do like this:
1883 #
1884 # make foo/bar/baz.s
1885 #
1886 # The supported suffixes for single-target are listed in 'single-targets'
1887 #
1888 # To build only under specific subdirectories, you can do like this:
1889 #
1890 # make foo/bar/baz/
1891
1892 ifdef single-build
1893
1894 # .ko is special because modpost is needed
1895 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1896 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1897 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1898
1899 $(single-ko): single_modules
1900 @:
1901 $(single-no-ko): $(build-dir)
1902 @:
1903
1904 # Remove MODORDER when done because it is not the real one.
1905 PHONY += single_modules
1906 single_modules: $(single-no-ko) modules_prepare
1907 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1908 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1909 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1910 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1911 endif
1912 $(Q)rm -f $(MODORDER)
1913
1914 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1915
1916 KBUILD_MODULES := 1
1917
1918 endif
1919
1920 # Preset locale variables to speed up the build process. Limit locale
1921 # tweaks to this spot to avoid wrong language settings when running
1922 # make menuconfig etc.
1923 # Error messages still appears in the original language
1924 PHONY += $(build-dir)
1925 $(build-dir): prepare
1926 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1927
1928 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1929 PHONY += $(clean-dirs) clean
1930 $(clean-dirs):
1931 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1932
1933 clean: $(clean-dirs)
1934 $(call cmd,rmfiles)
1935 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1936 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1937 -o -name '*.ko.*' \
1938 -o -name '*.dtb' -o -name '*.dtbo' \
1939 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1940 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1941 -o -name '*.dwo' -o -name '*.lst' \
1942 -o -name '*.su' -o -name '*.mod' \
1943 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1944 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1945 -o -name '*.asn1.[ch]' \
1946 -o -name '*.symtypes' -o -name 'modules.order' \
1947 -o -name '*.c.[012]*.*' \
1948 -o -name '*.ll' \
1949 -o -name '*.gcno' \
1950 -o -name '*.*.symversions' \) -type f -print \
1951 -o -name '.tmp_*' -print \
1952 | xargs rm -rf
1953
1954 # Generate tags for editors
1955 # ---------------------------------------------------------------------------
1956 quiet_cmd_tags = GEN $@
1957 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1958
1959 tags TAGS cscope gtags: FORCE
1960 $(call cmd,tags)
1961
1962 # Generate rust-project.json (a file that describes the structure of non-Cargo
1963 # Rust projects) for rust-analyzer (an implementation of the Language Server
1964 # Protocol).
1965 PHONY += rust-analyzer
1966 rust-analyzer:
1967 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1968 $(Q)$(MAKE) $(build)=rust $@
1969
1970 # Script to generate missing namespace dependencies
1971 # ---------------------------------------------------------------------------
1972
1973 PHONY += nsdeps
1974 nsdeps: export KBUILD_NSDEPS=1
1975 nsdeps: modules
1976 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1977
1978 # Clang Tooling
1979 # ---------------------------------------------------------------------------
1980
1981 quiet_cmd_gen_compile_commands = GEN $@
1982 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1983
1984 $(extmod_prefix)compile_commands.json: $(srctree)/scripts/clang-tools/gen_compile_commands.py \
1985 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1986 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1987 $(call if_changed,gen_compile_commands)
1988
1989 targets += $(extmod_prefix)compile_commands.json
1990
1991 PHONY += clang-tidy clang-analyzer
1992
1993 ifdef CONFIG_CC_IS_CLANG
1994 quiet_cmd_clang_tools = CHECK $<
1995 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1996
1997 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1998 $(call cmd,clang_tools)
1999 else
2000 clang-tidy clang-analyzer:
2001 @echo "$@ requires CC=clang" >&2
2002 @false
2003 endif
2004
2005 # Scripts to check various things for consistency
2006 # ---------------------------------------------------------------------------
2007
2008 PHONY += includecheck versioncheck coccicheck export_report
2009
2010 includecheck:
2011 find $(srctree)/* $(RCS_FIND_IGNORE) \
2012 -name '*.[hcS]' -type f -print | sort \
2013 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2014
2015 versioncheck:
2016 find $(srctree)/* $(RCS_FIND_IGNORE) \
2017 -name '*.[hcS]' -type f -print | sort \
2018 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2019
2020 coccicheck:
2021 $(Q)$(BASH) $(srctree)/scripts/$@
2022
2023 export_report:
2024 $(PERL) $(srctree)/scripts/export_report.pl
2025
2026 PHONY += checkstack kernelrelease kernelversion image_name
2027
2028 # UML needs a little special treatment here. It wants to use the host
2029 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2030 # else wants $(ARCH), including people doing cross-builds, which means
2031 # that $(SUBARCH) doesn't work here.
2032 ifeq ($(ARCH), um)
2033 CHECKSTACK_ARCH := $(SUBARCH)
2034 else
2035 CHECKSTACK_ARCH := $(ARCH)
2036 endif
2037 MINSTACKSIZE ?= 100
2038 checkstack:
2039 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2040 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2041
2042 kernelrelease:
2043 @$(filechk_kernel.release)
2044
2045 kernelversion:
2046 @echo $(KERNELVERSION)
2047
2048 image_name:
2049 @echo $(KBUILD_IMAGE)
2050
2051 PHONY += run-command
2052 run-command:
2053 $(Q)$(KBUILD_RUN_COMMAND)
2054
2055 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2056 cmd_rmfiles = rm -rf $(rm-files)
2057
2058 # read saved command lines for existing targets
2059 existing-targets := $(wildcard $(sort $(targets)))
2060
2061 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2062
2063 endif # config-build
2064 endif # mixed-build
2065 endif # need-sub-make
2066
2067 PHONY += FORCE
2068 FORCE:
2069
2070 # Declare the contents of the PHONY variable as phony. We keep that
2071 # information in a variable so we can use it in if_changed and friends.
2072 .PHONY: $(PHONY)
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