1 # SPDX-License-Identifier: GPL-2.0
2 VERSION = 6
3 PATCHLEVEL = 11
4 SUBLEVEL = 0
5 EXTRAVERSION = -rc3
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 -Dunsafe_op_in_unsafe_fn \
449 -Dnon_ascii_idents \
450 -Wrust_2018_idioms \
451 -Wunreachable_pub \
452 -Wmissing_docs \
453 -Wrustdoc::missing_crate_level_docs \
454 -Wclippy::all \
455 -Wclippy::mut_mut \
456 -Wclippy::needless_bitwise_bool \
457 -Wclippy::needless_continue \
458 -Wclippy::no_mangle_with_rust_abi \
459 -Wclippy::dbg_macro
460
461 KBUILD_HOSTCFLAGS := $(KBUILD_USERHOSTCFLAGS) $(HOST_LFS_CFLAGS) \
462 $(HOSTCFLAGS) -I $(srctree)/scripts/include
463 KBUILD_HOSTCXXFLAGS := -Wall -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS) \
464 -I $(srctree)/scripts/include
465 KBUILD_HOSTRUSTFLAGS := $(rust_common_flags) -O -Cstrip=debuginfo \
466 -Zallow-features= $(HOSTRUSTFLAGS)
467 KBUILD_HOSTLDFLAGS := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
468 KBUILD_HOSTLDLIBS := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
469
470 # Make variables (CC, etc...)
471 CPP = $(CC) -E
472 ifneq ($(LLVM),)
473 CC = $(LLVM_PREFIX)clang$(LLVM_SUFFIX)
474 LD = $(LLVM_PREFIX)ld.lld$(LLVM_SUFFIX)
475 AR = $(LLVM_PREFIX)llvm-ar$(LLVM_SUFFIX)
476 NM = $(LLVM_PREFIX)llvm-nm$(LLVM_SUFFIX)
477 OBJCOPY = $(LLVM_PREFIX)llvm-objcopy$(LLVM_SUFFIX)
478 OBJDUMP = $(LLVM_PREFIX)llvm-objdump$(LLVM_SUFFIX)
479 READELF = $(LLVM_PREFIX)llvm-readelf$(LLVM_SUFFIX)
480 STRIP = $(LLVM_PREFIX)llvm-strip$(LLVM_SUFFIX)
481 else
482 CC = $(CROSS_COMPILE)gcc
483 LD = $(CROSS_COMPILE)ld
484 AR = $(CROSS_COMPILE)ar
485 NM = $(CROSS_COMPILE)nm
486 OBJCOPY = $(CROSS_COMPILE)objcopy
487 OBJDUMP = $(CROSS_COMPILE)objdump
488 READELF = $(CROSS_COMPILE)readelf
489 STRIP = $(CROSS_COMPILE)strip
490 endif
491 RUSTC = rustc
492 RUSTDOC = rustdoc
493 RUSTFMT = rustfmt
494 CLIPPY_DRIVER = clippy-driver
495 BINDGEN = bindgen
496 PAHOLE = pahole
497 RESOLVE_BTFIDS = $(objtree)/tools/bpf/resolve_btfids/resolve_btfids
498 LEX = flex
499 YACC = bison
500 AWK = awk
501 INSTALLKERNEL := installkernel
502 PERL = perl
503 PYTHON3 = python3
504 CHECK = sparse
505 BASH = bash
506 KGZIP = gzip
507 KBZIP2 = bzip2
508 KLZOP = lzop
509 LZMA = lzma
510 LZ4 = lz4c
511 XZ = xz
512 ZSTD = zstd
513
514 CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
515 -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
516 NOSTDINC_FLAGS :=
517 CFLAGS_MODULE =
518 RUSTFLAGS_MODULE =
519 AFLAGS_MODULE =
520 LDFLAGS_MODULE =
521 CFLAGS_KERNEL =
522 RUSTFLAGS_KERNEL =
523 AFLAGS_KERNEL =
524 LDFLAGS_vmlinux =
525
526 # Use USERINCLUDE when you must reference the UAPI directories only.
527 USERINCLUDE := \
528 -I$(srctree)/arch/$(SRCARCH)/include/uapi \
529 -I$(objtree)/arch/$(SRCARCH)/include/generated/uapi \
530 -I$(srctree)/include/uapi \
531 -I$(objtree)/include/generated/uapi \
532 -include $(srctree)/include/linux/compiler-version.h \
533 -include $(srctree)/include/linux/kconfig.h
534
535 # Use LINUXINCLUDE when you must reference the include/ directory.
536 # Needed to be compatible with the O= option
537 LINUXINCLUDE := \
538 -I$(srctree)/arch/$(SRCARCH)/include \
539 -I$(objtree)/arch/$(SRCARCH)/include/generated \
540 $(if $(building_out_of_srctree),-I$(srctree)/include) \
541 -I$(objtree)/include \
542 $(USERINCLUDE)
543
544 KBUILD_AFLAGS := -D__ASSEMBLY__ -fno-PIE
545
546 KBUILD_CFLAGS :=
547 KBUILD_CFLAGS += -std=gnu11
548 KBUILD_CFLAGS += -fshort-wchar
549 KBUILD_CFLAGS += -funsigned-char
550 KBUILD_CFLAGS += -fno-common
551 KBUILD_CFLAGS += -fno-PIE
552 KBUILD_CFLAGS += -fno-strict-aliasing
553
554 KBUILD_CPPFLAGS := -D__KERNEL__
555 KBUILD_RUSTFLAGS := $(rust_common_flags) \
556 -Cpanic=abort -Cembed-bitcode=n -Clto=n \
557 -Cforce-unwind-tables=n -Ccodegen-units=1 \
558 -Csymbol-mangling-version=v0 \
559 -Crelocation-model=static \
560 -Zfunction-sections=n \
561 -Wclippy::float_arithmetic
562
563 KBUILD_AFLAGS_KERNEL :=
564 KBUILD_CFLAGS_KERNEL :=
565 KBUILD_RUSTFLAGS_KERNEL :=
566 KBUILD_AFLAGS_MODULE := -DMODULE
567 KBUILD_CFLAGS_MODULE := -DMODULE
568 KBUILD_RUSTFLAGS_MODULE := --cfg MODULE
569 KBUILD_LDFLAGS_MODULE :=
570 KBUILD_LDFLAGS :=
571 CLANG_FLAGS :=
572
573 ifeq ($(KBUILD_CLIPPY),1)
574 RUSTC_OR_CLIPPY_QUIET := CLIPPY
575 RUSTC_OR_CLIPPY = $(CLIPPY_DRIVER)
576 else
577 RUSTC_OR_CLIPPY_QUIET := RUSTC
578 RUSTC_OR_CLIPPY = $(RUSTC)
579 endif
580
581 ifdef RUST_LIB_SRC
582 export RUST_LIB_SRC
583 endif
584
585 # Allows the usage of unstable features in stable compilers.
586 export RUSTC_BOOTSTRAP := 1
587
588 export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE LD CC HOSTPKG_CONFIG
589 export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
590 export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
591 export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
592 export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
593 export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
594 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
595 export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS
596
597 export KBUILD_CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS KBUILD_LDFLAGS
598 export KBUILD_CFLAGS CFLAGS_KERNEL CFLAGS_MODULE
599 export KBUILD_RUSTFLAGS RUSTFLAGS_KERNEL RUSTFLAGS_MODULE
600 export KBUILD_AFLAGS AFLAGS_KERNEL AFLAGS_MODULE
601 export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_RUSTFLAGS_MODULE KBUILD_LDFLAGS_MODULE
602 export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL KBUILD_RUSTFLAGS_KERNEL
603
604 # Files to ignore in find ... statements
605
606 export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o \
607 -name CVS -o -name .pc -o -name .hg -o -name .git \) \
608 -prune -o
609
610 # ===========================================================================
611 # Rules shared between *config targets and build targets
612
613 # Basic helpers built in scripts/basic/
614 PHONY += scripts_basic
615 scripts_basic:
616 $(Q)$(MAKE) $(build)=scripts/basic
617
618 PHONY += outputmakefile
619 ifdef building_out_of_srctree
620 # Before starting out-of-tree build, make sure the source tree is clean.
621 # outputmakefile generates a Makefile in the output directory, if using a
622 # separate output directory. This allows convenient use of make in the
623 # output directory.
624 # At the same time when output Makefile generated, generate .gitignore to
625 # ignore whole output directory
626
627 quiet_cmd_makefile = GEN Makefile
628 cmd_makefile = { \
629 echo "\# Automatically generated by $(srctree)/Makefile: don't edit"; \
630 echo "include $(srctree)/Makefile"; \
631 } > Makefile
632
633 outputmakefile:
634 @if [ -f $(srctree)/.config -o \
635 -d $(srctree)/include/config -o \
636 -d $(srctree)/arch/$(SRCARCH)/include/generated ]; then \
637 echo >&2 "***"; \
638 echo >&2 "*** The source tree is not clean, please run 'make$(if $(findstring command line, $(origin ARCH)), ARCH=$(ARCH)) mrproper'"; \
639 echo >&2 "*** in $(abs_srctree)";\
640 echo >&2 "***"; \
641 false; \
642 fi
643 $(Q)ln -fsn $(srctree) source
644 $(call cmd,makefile)
645 $(Q)test -e .gitignore || \
646 { echo "# this is build directory, ignore it"; echo "*"; } > .gitignore
647 endif
648
649 # The expansion should be delayed until arch/$(SRCARCH)/Makefile is included.
650 # Some architectures define CROSS_COMPILE in arch/$(SRCARCH)/Makefile.
651 # CC_VERSION_TEXT is referenced from Kconfig (so it needs export),
652 # and from include/config/auto.conf.cmd to detect the compiler upgrade.
653 CC_VERSION_TEXT = $(subst $(pound),,$(shell LC_ALL=C $(CC) --version 2>/dev/null | head -n 1))
654
655 ifneq ($(findstring clang,$(CC_VERSION_TEXT)),)
656 include $(srctree)/scripts/Makefile.clang
657 endif
658
659 # Include this also for config targets because some architectures need
660 # cc-cross-prefix to determine CROSS_COMPILE.
661 ifdef need-compiler
662 include $(srctree)/scripts/Makefile.compiler
663 endif
664
665 ifdef config-build
666 # ===========================================================================
667 # *config targets only - make sure prerequisites are updated, and descend
668 # in scripts/kconfig to make the *config target
669
670 # Read arch-specific Makefile to set KBUILD_DEFCONFIG as needed.
671 # KBUILD_DEFCONFIG may point out an alternative default configuration
672 # used for 'make defconfig'
673 include $(srctree)/arch/$(SRCARCH)/Makefile
674 export KBUILD_DEFCONFIG KBUILD_KCONFIG CC_VERSION_TEXT
675
676 config: outputmakefile scripts_basic FORCE
677 $(Q)$(MAKE) $(build)=scripts/kconfig $@
678
679 %config: outputmakefile scripts_basic FORCE
680 $(Q)$(MAKE) $(build)=scripts/kconfig $@
681
682 else #!config-build
683 # ===========================================================================
684 # Build targets only - this includes vmlinux, arch-specific targets, clean
685 # targets and others. In general all targets except *config targets.
686
687 # If building an external module we do not care about the all: rule
688 # but instead __all depend on modules
689 PHONY += all
690 ifeq ($(KBUILD_EXTMOD),)
691 __all: all
692 else
693 __all: modules
694 endif
695
696 targets :=
697
698 # Decide whether to build built-in, modular, or both.
699 # Normally, just do built-in.
700
701 KBUILD_MODULES :=
702 KBUILD_BUILTIN := 1
703
704 # If we have only "make modules", don't compile built-in objects.
705 ifeq ($(MAKECMDGOALS),modules)
706 KBUILD_BUILTIN :=
707 endif
708
709 # If we have "make <whatever> modules", compile modules
710 # in addition to whatever we do anyway.
711 # Just "make" or "make all" shall build modules as well
712
713 ifneq ($(filter all modules nsdeps %compile_commands.json clang-%,$(MAKECMDGOALS)),)
714 KBUILD_MODULES := 1
715 endif
716
717 ifeq ($(MAKECMDGOALS),)
718 KBUILD_MODULES := 1
719 endif
720
721 export KBUILD_MODULES KBUILD_BUILTIN
722
723 ifdef need-config
724 include include/config/auto.conf
725 endif
726
727 ifeq ($(KBUILD_EXTMOD),)
728 # Objects we will link into vmlinux / subdirs we need to visit
729 core-y :=
730 drivers-y :=
731 libs-y := lib/
732 endif # KBUILD_EXTMOD
733
734 # The all: target is the default when no target is given on the
735 # command line.
736 # This allow a user to issue only 'make' to build a kernel including modules
737 # Defaults to vmlinux, but the arch makefile usually adds further targets
738 all: vmlinux
739
740 CFLAGS_GCOV := -fprofile-arcs -ftest-coverage
741 ifdef CONFIG_CC_IS_GCC
742 CFLAGS_GCOV += -fno-tree-loop-im
743 endif
744 export CFLAGS_GCOV
745
746 # The arch Makefiles can override CC_FLAGS_FTRACE. We may also append it later.
747 ifdef CONFIG_FUNCTION_TRACER
748 CC_FLAGS_FTRACE := -pg
749 endif
750
751 include $(srctree)/arch/$(SRCARCH)/Makefile
752
753 ifdef need-config
754 ifdef may-sync-config
755 # Read in dependencies to all Kconfig* files, make sure to run syncconfig if
756 # changes are detected. This should be included after arch/$(SRCARCH)/Makefile
757 # because some architectures define CROSS_COMPILE there.
758 include include/config/auto.conf.cmd
759
760 $(KCONFIG_CONFIG):
761 @echo >&2 '***'
762 @echo >&2 '*** Configuration file "$@" not found!'
763 @echo >&2 '***'
764 @echo >&2 '*** Please run some configurator (e.g. "make oldconfig" or'
765 @echo >&2 '*** "make menuconfig" or "make xconfig").'
766 @echo >&2 '***'
767 @/bin/false
768
769 # The actual configuration files used during the build are stored in
770 # include/generated/ and include/config/. Update them if .config is newer than
771 # include/config/auto.conf (which mirrors .config).
772 #
773 # This exploits the 'multi-target pattern rule' trick.
774 # The syncconfig should be executed only once to make all the targets.
775 # (Note: use the grouped target '&:' when we bump to GNU Make 4.3)
776 #
777 # Do not use $(call cmd,...) here. That would suppress prompts from syncconfig,
778 # so you cannot notice that Kconfig is waiting for the user input.
779 %/config/auto.conf %/config/auto.conf.cmd %/generated/autoconf.h %/generated/rustc_cfg: $(KCONFIG_CONFIG)
780 $(Q)$(kecho) " SYNC $@"
781 $(Q)$(MAKE) -f $(srctree)/Makefile syncconfig
782 else # !may-sync-config
783 # External modules and some install targets need include/generated/autoconf.h
784 # and include/config/auto.conf but do not care if they are up-to-date.
785 # Use auto.conf to trigger the test
786 PHONY += include/config/auto.conf
787
788 include/config/auto.conf:
789 @test -e include/generated/autoconf.h -a -e $@ || ( \
790 echo >&2; \
791 echo >&2 " ERROR: Kernel configuration is invalid."; \
792 echo >&2 " include/generated/autoconf.h or $@ are missing.";\
793 echo >&2 " Run 'make oldconfig && make prepare' on kernel src to fix it."; \
794 echo >&2 ; \
795 /bin/false)
796
797 endif # may-sync-config
798 endif # need-config
799
800 KBUILD_CFLAGS += -fno-delete-null-pointer-checks
801
802 ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
803 KBUILD_CFLAGS += -O2
804 KBUILD_RUSTFLAGS += -Copt-level=2
805 else ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
806 KBUILD_CFLAGS += -Os
807 KBUILD_RUSTFLAGS += -Copt-level=s
808 endif
809
810 # Always set `debug-assertions` and `overflow-checks` because their default
811 # depends on `opt-level` and `debug-assertions`, respectively.
812 KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
813 KBUILD_RUSTFLAGS += -Coverflow-checks=$(if $(CONFIG_RUST_OVERFLOW_CHECKS),y,n)
814
815 # Tell gcc to never replace conditional load with a non-conditional one
816 ifdef CONFIG_CC_IS_GCC
817 # gcc-10 renamed --param=allow-store-data-races=0 to
818 # -fno-allow-store-data-races.
819 KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
820 KBUILD_CFLAGS += $(call cc-option,-fno-allow-store-data-races)
821 endif
822
823 ifdef CONFIG_READABLE_ASM
824 # Disable optimizations that make assembler listings hard to read.
825 # reorder blocks reorders the control in the function
826 # ipa clone creates specialized cloned functions
827 # partial inlining inlines only parts of functions
828 KBUILD_CFLAGS += -fno-reorder-blocks -fno-ipa-cp-clone -fno-partial-inlining
829 endif
830
831 stackp-flags-y := -fno-stack-protector
832 stackp-flags-$(CONFIG_STACKPROTECTOR) := -fstack-protector
833 stackp-flags-$(CONFIG_STACKPROTECTOR_STRONG) := -fstack-protector-strong
834
835 KBUILD_CFLAGS += $(stackp-flags-y)
836
837 KBUILD_RUSTFLAGS-$(CONFIG_WERROR) += -Dwarnings
838 KBUILD_RUSTFLAGS += $(KBUILD_RUSTFLAGS-y)
839
840 ifdef CONFIG_FRAME_POINTER
841 KBUILD_CFLAGS += -fno-omit-frame-pointer -fno-optimize-sibling-calls
842 KBUILD_RUSTFLAGS += -Cforce-frame-pointers=y
843 else
844 # Some targets (ARM with Thumb2, for example), can't be built with frame
845 # pointers. For those, we don't have FUNCTION_TRACER automatically
846 # select FRAME_POINTER. However, FUNCTION_TRACER adds -pg, and this is
847 # incompatible with -fomit-frame-pointer with current GCC, so we don't use
848 # -fomit-frame-pointer with FUNCTION_TRACER.
849 # In the Rust target specification, "frame-pointer" is set explicitly
850 # to "may-omit".
851 ifndef CONFIG_FUNCTION_TRACER
852 KBUILD_CFLAGS += -fomit-frame-pointer
853 endif
854 endif
855
856 # Initialize all stack variables with a 0xAA pattern.
857 ifdef CONFIG_INIT_STACK_ALL_PATTERN
858 KBUILD_CFLAGS += -ftrivial-auto-var-init=pattern
859 endif
860
861 # Initialize all stack variables with a zero value.
862 ifdef CONFIG_INIT_STACK_ALL_ZERO
863 KBUILD_CFLAGS += -ftrivial-auto-var-init=zero
864 ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER
865 # https://github.com/llvm/llvm-project/issues/44842
866 CC_AUTO_VAR_INIT_ZERO_ENABLER := -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
867 export CC_AUTO_VAR_INIT_ZERO_ENABLER
868 KBUILD_CFLAGS += $(CC_AUTO_VAR_INIT_ZERO_ENABLER)
869 endif
870 endif
871
872 # While VLAs have been removed, GCC produces unreachable stack probes
873 # for the randomize_kstack_offset feature. Disable it for all compilers.
874 KBUILD_CFLAGS += $(call cc-option, -fno-stack-clash-protection)
875
876 # Clear used registers at func exit (to reduce data lifetime and ROP gadgets).
877 ifdef CONFIG_ZERO_CALL_USED_REGS
878 KBUILD_CFLAGS += -fzero-call-used-regs=used-gpr
879 endif
880
881 ifdef CONFIG_FUNCTION_TRACER
882 ifdef CONFIG_FTRACE_MCOUNT_USE_CC
883 CC_FLAGS_FTRACE += -mrecord-mcount
884 ifdef CONFIG_HAVE_NOP_MCOUNT
885 ifeq ($(call cc-option-yn, -mnop-mcount),y)
886 CC_FLAGS_FTRACE += -mnop-mcount
887 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
888 endif
889 endif
890 endif
891 ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL
892 ifdef CONFIG_HAVE_OBJTOOL_NOP_MCOUNT
893 CC_FLAGS_USING += -DCC_USING_NOP_MCOUNT
894 endif
895 endif
896 ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
897 ifdef CONFIG_HAVE_C_RECORDMCOUNT
898 BUILD_C_RECORDMCOUNT := y
899 export BUILD_C_RECORDMCOUNT
900 endif
901 endif
902 ifdef CONFIG_HAVE_FENTRY
903 # s390-linux-gnu-gcc did not support -mfentry until gcc-9.
904 ifeq ($(call cc-option-yn, -mfentry),y)
905 CC_FLAGS_FTRACE += -mfentry
906 CC_FLAGS_USING += -DCC_USING_FENTRY
907 endif
908 endif
909 export CC_FLAGS_FTRACE
910 KBUILD_CFLAGS += $(CC_FLAGS_FTRACE) $(CC_FLAGS_USING)
911 KBUILD_AFLAGS += $(CC_FLAGS_USING)
912 endif
913
914 # We trigger additional mismatches with less inlining
915 ifdef CONFIG_DEBUG_SECTION_MISMATCH
916 KBUILD_CFLAGS += -fno-inline-functions-called-once
917 endif
918
919 # `rustc`'s `-Zfunction-sections` applies to data too (as of 1.59.0).
920 ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
921 KBUILD_CFLAGS_KERNEL += -ffunction-sections -fdata-sections
922 KBUILD_RUSTFLAGS_KERNEL += -Zfunction-sections=y
923 LDFLAGS_vmlinux += --gc-sections
924 endif
925
926 ifdef CONFIG_SHADOW_CALL_STACK
927 ifndef CONFIG_DYNAMIC_SCS
928 CC_FLAGS_SCS := -fsanitize=shadow-call-stack
929 KBUILD_CFLAGS += $(CC_FLAGS_SCS)
930 endif
931 export CC_FLAGS_SCS
932 endif
933
934 ifdef CONFIG_LTO_CLANG
935 ifdef CONFIG_LTO_CLANG_THIN
936 CC_FLAGS_LTO := -flto=thin -fsplit-lto-unit
937 else
938 CC_FLAGS_LTO := -flto
939 endif
940 CC_FLAGS_LTO += -fvisibility=hidden
941
942 # Limit inlining across translation units to reduce binary size
943 KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
944 endif
945
946 ifdef CONFIG_LTO
947 KBUILD_CFLAGS += -fno-lto $(CC_FLAGS_LTO)
948 KBUILD_AFLAGS += -fno-lto
949 export CC_FLAGS_LTO
950 endif
951
952 ifdef CONFIG_CFI_CLANG
953 CC_FLAGS_CFI := -fsanitize=kcfi
954 KBUILD_CFLAGS += $(CC_FLAGS_CFI)
955 export CC_FLAGS_CFI
956 endif
957
958 # Architectures can define flags to add/remove for floating-point support
959 CC_FLAGS_FPU += -D_LINUX_FPU_COMPILATION_UNIT
960 export CC_FLAGS_FPU
961 export CC_FLAGS_NO_FPU
962
963 ifneq ($(CONFIG_FUNCTION_ALIGNMENT),0)
964 # Set the minimal function alignment. Use the newer GCC option
965 # -fmin-function-alignment if it is available, or fall back to -falign-funtions.
966 # See also CONFIG_CC_HAS_SANE_FUNCTION_ALIGNMENT.
967 ifdef CONFIG_CC_HAS_MIN_FUNCTION_ALIGNMENT
968 KBUILD_CFLAGS += -fmin-function-alignment=$(CONFIG_FUNCTION_ALIGNMENT)
969 else
970 KBUILD_CFLAGS += -falign-functions=$(CONFIG_FUNCTION_ALIGNMENT)
971 endif
972 endif
973
974 # arch Makefile may override CC so keep this after arch Makefile is included
975 NOSTDINC_FLAGS += -nostdinc
976
977 # To gain proper coverage for CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE,
978 # the kernel uses only C99 flexible arrays for dynamically sized trailing
979 # arrays. Enforce this for everything that may examine structure sizes and
980 # perform bounds checking.
981 KBUILD_CFLAGS += $(call cc-option, -fstrict-flex-arrays=3)
982
983 #Currently, disable -Wstringop-overflow for GCC 11, globally.
984 KBUILD_CFLAGS-$(CONFIG_CC_NO_STRINGOP_OVERFLOW) += $(call cc-option, -Wno-stringop-overflow)
985 KBUILD_CFLAGS-$(CONFIG_CC_STRINGOP_OVERFLOW) += $(call cc-option, -Wstringop-overflow)
986
987 # disable invalid "can't wrap" optimizations for signed / pointers
988 KBUILD_CFLAGS += -fno-strict-overflow
989
990 # Make sure -fstack-check isn't enabled (like gentoo apparently did)
991 KBUILD_CFLAGS += -fno-stack-check
992
993 # conserve stack if available
994 ifdef CONFIG_CC_IS_GCC
995 KBUILD_CFLAGS += -fconserve-stack
996 endif
997
998 # change __FILE__ to the relative path from the srctree
999 KBUILD_CPPFLAGS += $(call cc-option,-fmacro-prefix-map=$(srctree)/=)
1000
1001 # include additional Makefiles when needed
1002 include-y := scripts/Makefile.extrawarn
1003 include-$(CONFIG_DEBUG_INFO) += scripts/Makefile.debug
1004 include-$(CONFIG_DEBUG_INFO_BTF)+= scripts/Makefile.btf
1005 include-$(CONFIG_KASAN) += scripts/Makefile.kasan
1006 include-$(CONFIG_KCSAN) += scripts/Makefile.kcsan
1007 include-$(CONFIG_KMSAN) += scripts/Makefile.kmsan
1008 include-$(CONFIG_UBSAN) += scripts/Makefile.ubsan
1009 include-$(CONFIG_KCOV) += scripts/Makefile.kcov
1010 include-$(CONFIG_RANDSTRUCT) += scripts/Makefile.randstruct
1011 include-$(CONFIG_GCC_PLUGINS) += scripts/Makefile.gcc-plugins
1012
1013 include $(addprefix $(srctree)/, $(include-y))
1014
1015 # scripts/Makefile.gcc-plugins is intentionally included last.
1016 # Do not add $(call cc-option,...) below this line. When you build the kernel
1017 # from the clean source tree, the GCC plugins do not exist at this point.
1018
1019 # Add user supplied CPPFLAGS, AFLAGS, CFLAGS and RUSTFLAGS as the last assignments
1020 KBUILD_CPPFLAGS += $(KCPPFLAGS)
1021 KBUILD_AFLAGS += $(KAFLAGS)
1022 KBUILD_CFLAGS += $(KCFLAGS)
1023 KBUILD_RUSTFLAGS += $(KRUSTFLAGS)
1024
1025 KBUILD_LDFLAGS_MODULE += --build-id=sha1
1026 LDFLAGS_vmlinux += --build-id=sha1
1027
1028 KBUILD_LDFLAGS += -z noexecstack
1029 ifeq ($(CONFIG_LD_IS_BFD),y)
1030 KBUILD_LDFLAGS += $(call ld-option,--no-warn-rwx-segments)
1031 endif
1032
1033 ifeq ($(CONFIG_STRIP_ASM_SYMS),y)
1034 LDFLAGS_vmlinux += -X
1035 endif
1036
1037 ifeq ($(CONFIG_RELR),y)
1038 # ld.lld before 15 did not support -z pack-relative-relocs.
1039 LDFLAGS_vmlinux += $(call ld-option,--pack-dyn-relocs=relr,-z pack-relative-relocs)
1040 endif
1041
1042 # We never want expected sections to be placed heuristically by the
1043 # linker. All sections should be explicitly named in the linker script.
1044 ifdef CONFIG_LD_ORPHAN_WARN
1045 LDFLAGS_vmlinux += --orphan-handling=$(CONFIG_LD_ORPHAN_WARN_LEVEL)
1046 endif
1047
1048 # Align the bit size of userspace programs with the kernel
1049 KBUILD_USERCFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1050 KBUILD_USERLDFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
1051
1052 # make the checker run with the right architecture
1053 CHECKFLAGS += --arch=$(ARCH)
1054
1055 # insure the checker run with the right endianness
1056 CHECKFLAGS += $(if $(CONFIG_CPU_BIG_ENDIAN),-mbig-endian,-mlittle-endian)
1057
1058 # the checker needs the correct machine size
1059 CHECKFLAGS += $(if $(CONFIG_64BIT),-m64,-m32)
1060
1061 # Default kernel image to build when no specific target is given.
1062 # KBUILD_IMAGE may be overruled on the command line or
1063 # set in the environment
1064 # Also any assignments in arch/$(ARCH)/Makefile take precedence over
1065 # this default value
1066 export KBUILD_IMAGE ?= vmlinux
1067
1068 #
1069 # INSTALL_PATH specifies where to place the updated kernel and system map
1070 # images. Default is /boot, but you can set it to other values
1071 export INSTALL_PATH ?= /boot
1072
1073 #
1074 # INSTALL_DTBS_PATH specifies a prefix for relocations required by build roots.
1075 # Like INSTALL_MOD_PATH, it isn't defined in the Makefile, but can be passed as
1076 # an argument if needed. Otherwise it defaults to the kernel install path
1077 #
1078 export INSTALL_DTBS_PATH ?= $(INSTALL_PATH)/dtbs/$(KERNELRELEASE)
1079
1080 #
1081 # INSTALL_MOD_PATH specifies a prefix to MODLIB for module directory
1082 # relocations required by build roots. This is not defined in the
1083 # makefile but the argument can be passed to make if needed.
1084 #
1085
1086 MODLIB = $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)
1087 export MODLIB
1088
1089 PHONY += prepare0
1090
1091 export extmod_prefix = $(if $(KBUILD_EXTMOD),$(KBUILD_EXTMOD)/)
1092 export MODORDER := $(extmod_prefix)modules.order
1093 export MODULES_NSDEPS := $(extmod_prefix)modules.nsdeps
1094
1095 ifeq ($(KBUILD_EXTMOD),)
1096
1097 build-dir := .
1098 clean-dirs := $(sort . Documentation \
1099 $(patsubst %/,%,$(filter %/, $(core-) \
1100 $(drivers-) $(libs-))))
1101
1102 export ARCH_CORE := $(core-y)
1103 export ARCH_LIB := $(filter %/, $(libs-y))
1104 export ARCH_DRIVERS := $(drivers-y) $(drivers-m)
1105 # Externally visible symbols (used by link-vmlinux.sh)
1106
1107 KBUILD_VMLINUX_OBJS := ./built-in.a
1108 ifdef CONFIG_MODULES
1109 KBUILD_VMLINUX_OBJS += $(patsubst %/, %/lib.a, $(filter %/, $(libs-y)))
1110 KBUILD_VMLINUX_LIBS := $(filter-out %/, $(libs-y))
1111 else
1112 KBUILD_VMLINUX_LIBS := $(patsubst %/,%/lib.a, $(libs-y))
1113 endif
1114
1115 export KBUILD_VMLINUX_LIBS
1116 export KBUILD_LDS := arch/$(SRCARCH)/kernel/vmlinux.lds
1117
1118 ifdef CONFIG_TRIM_UNUSED_KSYMS
1119 # For the kernel to actually contain only the needed exported symbols,
1120 # we have to build modules as well to determine what those symbols are.
1121 KBUILD_MODULES := 1
1122 endif
1123
1124 # '$(AR) mPi' needs 'T' to workaround the bug of llvm-ar <= 14
1125 quiet_cmd_ar_vmlinux.a = AR $@
1126 cmd_ar_vmlinux.a = \
1127 rm -f $@; \
1128 $(AR) cDPrST $@ $(KBUILD_VMLINUX_OBJS); \
1129 $(AR) mPiT $$($(AR) t $@ | sed -n 1p) $@ $$($(AR) t $@ | grep -F -f $(srctree)/scripts/head-object-list.txt)
1130
1131 targets += vmlinux.a
1132 vmlinux.a: $(KBUILD_VMLINUX_OBJS) scripts/head-object-list.txt FORCE
1133 $(call if_changed,ar_vmlinux.a)
1134
1135 PHONY += vmlinux_o
1136 vmlinux_o: vmlinux.a $(KBUILD_VMLINUX_LIBS)
1137 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux_o
1138
1139 vmlinux.o modules.builtin.modinfo modules.builtin: vmlinux_o
1140 @:
1141
1142 PHONY += vmlinux
1143 # LDFLAGS_vmlinux in the top Makefile defines linker flags for the top vmlinux,
1144 # not for decompressors. LDFLAGS_vmlinux in arch/*/boot/compressed/Makefile is
1145 # unrelated; the decompressors just happen to have the same base name,
1146 # arch/*/boot/compressed/vmlinux.
1147 # Export LDFLAGS_vmlinux only to scripts/Makefile.vmlinux.
1148 #
1149 # _LDFLAGS_vmlinux is a workaround for the 'private export' bug:
1150 # https://savannah.gnu.org/bugs/?61463
1151 # For Make > 4.4, the following simple code will work:
1152 # vmlinux: private export LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1153 vmlinux: private _LDFLAGS_vmlinux := $(LDFLAGS_vmlinux)
1154 vmlinux: export LDFLAGS_vmlinux = $(_LDFLAGS_vmlinux)
1155 vmlinux: vmlinux.o $(KBUILD_LDS) modpost
1156 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vmlinux
1157
1158 # The actual objects are generated when descending,
1159 # make sure no implicit rule kicks in
1160 $(sort $(KBUILD_LDS) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS)): . ;
1161
1162 ifeq ($(origin KERNELRELEASE),file)
1163 filechk_kernel.release = $(srctree)/scripts/setlocalversion $(srctree)
1164 else
1165 filechk_kernel.release = echo $(KERNELRELEASE)
1166 endif
1167
1168 # Store (new) KERNELRELEASE string in include/config/kernel.release
1169 include/config/kernel.release: FORCE
1170 $(call filechk,kernel.release)
1171
1172 # Additional helpers built in scripts/
1173 # Carefully list dependencies so we do not try to build scripts twice
1174 # in parallel
1175 PHONY += scripts
1176 scripts: scripts_basic scripts_dtc
1177 $(Q)$(MAKE) $(build)=$(@)
1178
1179 # Things we need to do before we recursively start building the kernel
1180 # or the modules are listed in "prepare".
1181 # A multi level approach is used. prepareN is processed before prepareN-1.
1182 # archprepare is used in arch Makefiles and when processed asm symlink,
1183 # version.h and scripts_basic is processed / created.
1184
1185 PHONY += prepare archprepare
1186
1187 archprepare: outputmakefile archheaders archscripts scripts include/config/kernel.release \
1188 asm-generic $(version_h) include/generated/utsrelease.h \
1189 include/generated/compile.h include/generated/autoconf.h remove-stale-files
1190
1191 prepare0: archprepare
1192 $(Q)$(MAKE) $(build)=scripts/mod
1193 $(Q)$(MAKE) $(build)=. prepare
1194
1195 # All the preparing..
1196 prepare: prepare0
1197 ifdef CONFIG_RUST
1198 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1199 $(Q)$(MAKE) $(build)=rust
1200 endif
1201
1202 PHONY += remove-stale-files
1203 remove-stale-files:
1204 $(Q)$(srctree)/scripts/remove-stale-files
1205
1206 # Support for using generic headers in asm-generic
1207 asm-generic := -f $(srctree)/scripts/Makefile.asm-headers obj
1208
1209 PHONY += asm-generic uapi-asm-generic
1210 asm-generic: uapi-asm-generic
1211 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/asm \
1212 generic=include/asm-generic
1213 uapi-asm-generic:
1214 $(Q)$(MAKE) $(asm-generic)=arch/$(SRCARCH)/include/generated/uapi/asm \
1215 generic=include/uapi/asm-generic
1216
1217 # Generate some files
1218 # ---------------------------------------------------------------------------
1219
1220 # KERNELRELEASE can change from a few different places, meaning version.h
1221 # needs to be updated, so this check is forced on all builds
1222
1223 uts_len := 64
1224 define filechk_utsrelease.h
1225 if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \
1226 echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \
1227 exit 1; \
1228 fi; \
1229 echo \#define UTS_RELEASE \"$(KERNELRELEASE)\"
1230 endef
1231
1232 define filechk_version.h
1233 if [ $(SUBLEVEL) -gt 255 ]; then \
1234 echo \#define LINUX_VERSION_CODE $(shell \
1235 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + 255); \
1236 else \
1237 echo \#define LINUX_VERSION_CODE $(shell \
1238 expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \
1239 fi; \
1240 echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + \
1241 ((c) > 255 ? 255 : (c)))'; \
1242 echo \#define LINUX_VERSION_MAJOR $(VERSION); \
1243 echo \#define LINUX_VERSION_PATCHLEVEL $(PATCHLEVEL); \
1244 echo \#define LINUX_VERSION_SUBLEVEL $(SUBLEVEL)
1245 endef
1246
1247 $(version_h): private PATCHLEVEL := $(or $(PATCHLEVEL), 0)
1248 $(version_h): private SUBLEVEL := $(or $(SUBLEVEL), 0)
1249 $(version_h): FORCE
1250 $(call filechk,version.h)
1251
1252 include/generated/utsrelease.h: include/config/kernel.release FORCE
1253 $(call filechk,utsrelease.h)
1254
1255 filechk_compile.h = $(srctree)/scripts/mkcompile_h \
1256 "$(UTS_MACHINE)" "$(CONFIG_CC_VERSION_TEXT)" "$(LD)"
1257
1258 include/generated/compile.h: FORCE
1259 $(call filechk,compile.h)
1260
1261 PHONY += headerdep
1262 headerdep:
1263 $(Q)find $(srctree)/include/ -name '*.h' | xargs --max-args 1 \
1264 $(srctree)/scripts/headerdep.pl -I$(srctree)/include
1265
1266 # ---------------------------------------------------------------------------
1267 # Kernel headers
1268
1269 #Default location for installed headers
1270 export INSTALL_HDR_PATH = $(objtree)/usr
1271
1272 quiet_cmd_headers_install = INSTALL $(INSTALL_HDR_PATH)/include
1273 cmd_headers_install = \
1274 mkdir -p $(INSTALL_HDR_PATH); \
1275 rsync -mrl --include='*/' --include='*\.h' --exclude='*' \
1276 usr/include $(INSTALL_HDR_PATH)
1277
1278 PHONY += headers_install
1279 headers_install: headers
1280 $(call cmd,headers_install)
1281
1282 PHONY += archheaders archscripts
1283
1284 hdr-inst := -f $(srctree)/scripts/Makefile.headersinst obj
1285
1286 PHONY += headers
1287 headers: $(version_h) scripts_unifdef uapi-asm-generic archheaders archscripts
1288 $(if $(filter um, $(SRCARCH)), $(error Headers not exportable for UML))
1289 $(Q)$(MAKE) $(hdr-inst)=include/uapi
1290 $(Q)$(MAKE) $(hdr-inst)=arch/$(SRCARCH)/include/uapi
1291
1292 ifdef CONFIG_HEADERS_INSTALL
1293 prepare: headers
1294 endif
1295
1296 PHONY += scripts_unifdef
1297 scripts_unifdef: scripts_basic
1298 $(Q)$(MAKE) $(build)=scripts scripts/unifdef
1299
1300 # ---------------------------------------------------------------------------
1301 # Install
1302
1303 # Many distributions have the custom install script, /sbin/installkernel.
1304 # If DKMS is installed, 'make install' will eventually recurse back
1305 # to this Makefile to build and install external modules.
1306 # Cancel sub_make_done so that options such as M=, V=, etc. are parsed.
1307
1308 quiet_cmd_install = INSTALL $(INSTALL_PATH)
1309 cmd_install = unset sub_make_done; $(srctree)/scripts/install.sh
1310
1311 # ---------------------------------------------------------------------------
1312 # vDSO install
1313
1314 PHONY += vdso_install
1315 vdso_install: export INSTALL_FILES = $(vdso-install-y)
1316 vdso_install:
1317 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.vdsoinst
1318
1319 # ---------------------------------------------------------------------------
1320 # Tools
1321
1322 ifdef CONFIG_OBJTOOL
1323 prepare: tools/objtool
1324 endif
1325
1326 ifdef CONFIG_BPF
1327 ifdef CONFIG_DEBUG_INFO_BTF
1328 prepare: tools/bpf/resolve_btfids
1329 endif
1330 endif
1331
1332 # The tools build system is not a part of Kbuild and tends to introduce
1333 # its own unique issues. If you need to integrate a new tool into Kbuild,
1334 # please consider locating that tool outside the tools/ tree and using the
1335 # standard Kbuild "hostprogs" syntax instead of adding a new tools/* entry
1336 # here. See Documentation/kbuild/makefiles.rst for details.
1337
1338 PHONY += resolve_btfids_clean
1339
1340 resolve_btfids_O = $(abspath $(objtree))/tools/bpf/resolve_btfids
1341
1342 # tools/bpf/resolve_btfids directory might not exist
1343 # in output directory, skip its clean in that case
1344 resolve_btfids_clean:
1345 ifneq ($(wildcard $(resolve_btfids_O)),)
1346 $(Q)$(MAKE) -sC $(srctree)/tools/bpf/resolve_btfids O=$(resolve_btfids_O) clean
1347 endif
1348
1349 # Clear a bunch of variables before executing the submake
1350 ifeq ($(quiet),silent_)
1351 tools_silent=s
1352 endif
1353
1354 tools/: FORCE
1355 $(Q)mkdir -p $(objtree)/tools
1356 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/
1357
1358 tools/%: FORCE
1359 $(Q)mkdir -p $(objtree)/tools
1360 $(Q)$(MAKE) LDFLAGS= MAKEFLAGS="$(tools_silent) $(filter --j% -j,$(MAKEFLAGS))" O=$(abspath $(objtree)) subdir=tools -C $(srctree)/tools/ $*
1361
1362 # ---------------------------------------------------------------------------
1363 # Kernel selftest
1364
1365 PHONY += kselftest
1366 kselftest: headers
1367 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests run_tests
1368
1369 kselftest-%: headers FORCE
1370 $(Q)$(MAKE) -C $(srctree)/tools/testing/selftests $*
1371
1372 PHONY += kselftest-merge
1373 kselftest-merge:
1374 $(if $(wildcard $(objtree)/.config),, $(error No .config exists, config your kernel first!))
1375 $(Q)find $(srctree)/tools/testing/selftests -name config -o -name config.$(UTS_MACHINE) | \
1376 xargs $(srctree)/scripts/kconfig/merge_config.sh -y -m $(objtree)/.config
1377 $(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig
1378
1379 # ---------------------------------------------------------------------------
1380 # Devicetree files
1381
1382 ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),)
1383 dtstree := arch/$(SRCARCH)/boot/dts
1384 endif
1385
1386 ifneq ($(dtstree),)
1387
1388 %.dtb: dtbs_prepare
1389 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1390
1391 %.dtbo: dtbs_prepare
1392 $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@
1393
1394 PHONY += dtbs dtbs_prepare dtbs_install dtbs_check
1395 dtbs: dtbs_prepare
1396 $(Q)$(MAKE) $(build)=$(dtstree) need-dtbslist=1
1397
1398 # include/config/kernel.release is actually needed when installing DTBs because
1399 # INSTALL_DTBS_PATH contains $(KERNELRELEASE). However, we do not want to make
1400 # dtbs_install depend on it as dtbs_install may run as root.
1401 dtbs_prepare: include/config/kernel.release scripts_dtc
1402
1403 ifneq ($(filter dtbs_check, $(MAKECMDGOALS)),)
1404 export CHECK_DTBS=y
1405 endif
1406
1407 ifneq ($(CHECK_DTBS),)
1408 dtbs_prepare: dt_binding_schemas
1409 endif
1410
1411 dtbs_check: dtbs
1412
1413 dtbs_install:
1414 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.dtbinst obj=$(dtstree)
1415
1416 ifdef CONFIG_OF_EARLY_FLATTREE
1417 all: dtbs
1418 endif
1419
1420 endif
1421
1422 PHONY += scripts_dtc
1423 scripts_dtc: scripts_basic
1424 $(Q)$(MAKE) $(build)=scripts/dtc
1425
1426 ifneq ($(filter dt_binding_check, $(MAKECMDGOALS)),)
1427 export CHECK_DTBS=y
1428 endif
1429
1430 PHONY += dt_binding_check dt_binding_schemas
1431 dt_binding_check: dt_binding_schemas scripts_dtc
1432 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1433
1434 dt_binding_schemas:
1435 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings
1436
1437 PHONY += dt_compatible_check
1438 dt_compatible_check: dt_binding_schemas
1439 $(Q)$(MAKE) $(build)=Documentation/devicetree/bindings $@
1440
1441 # ---------------------------------------------------------------------------
1442 # Modules
1443
1444 ifdef CONFIG_MODULES
1445
1446 # By default, build modules as well
1447
1448 all: modules
1449
1450 # When we're building modules with modversions, we need to consider
1451 # the built-in objects during the descend as well, in order to
1452 # make sure the checksums are up to date before we record them.
1453 ifdef CONFIG_MODVERSIONS
1454 KBUILD_BUILTIN := 1
1455 endif
1456
1457 # Build modules
1458 #
1459
1460 # *.ko are usually independent of vmlinux, but CONFIG_DEBUG_INFO_BTF_MODULES
1461 # is an exception.
1462 ifdef CONFIG_DEBUG_INFO_BTF_MODULES
1463 KBUILD_BUILTIN := 1
1464 modules: vmlinux
1465 endif
1466
1467 modules: modules_prepare
1468
1469 # Target to prepare building external modules
1470 modules_prepare: prepare
1471 $(Q)$(MAKE) $(build)=scripts scripts/module.lds
1472
1473 endif # CONFIG_MODULES
1474
1475 ###
1476 # Cleaning is done on three levels.
1477 # make clean Delete most generated files
1478 # Leave enough to build external modules
1479 # make mrproper Delete the current configuration, and all generated files
1480 # make distclean Remove editor backup files, patch leftover files and the like
1481
1482 # Directories & files removed with 'make clean'
1483 CLEAN_FILES += vmlinux.symvers modules-only.symvers \
1484 modules.builtin modules.builtin.modinfo modules.nsdeps \
1485 compile_commands.json rust/test \
1486 rust-project.json .vmlinux.objs .vmlinux.export.c
1487
1488 # Directories & files removed with 'make mrproper'
1489 MRPROPER_FILES += include/config include/generated \
1490 arch/$(SRCARCH)/include/generated .objdiff \
1491 debian snap tar-install PKGBUILD pacman \
1492 .config .config.old .version \
1493 Module.symvers \
1494 certs/signing_key.pem \
1495 certs/x509.genkey \
1496 vmlinux-gdb.py \
1497 rpmbuild \
1498 rust/libmacros.so
1499
1500 # clean - Delete most, but leave enough to build external modules
1501 #
1502 clean: private rm-files := $(CLEAN_FILES)
1503
1504 PHONY += archclean vmlinuxclean
1505
1506 vmlinuxclean:
1507 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/link-vmlinux.sh clean
1508 $(Q)$(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) clean)
1509
1510 clean: archclean vmlinuxclean resolve_btfids_clean
1511
1512 # mrproper - Delete all generated files, including .config
1513 #
1514 mrproper: private rm-files := $(MRPROPER_FILES)
1515 mrproper-dirs := $(addprefix _mrproper_,scripts)
1516
1517 PHONY += $(mrproper-dirs) mrproper
1518 $(mrproper-dirs):
1519 $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)
1520
1521 mrproper: clean $(mrproper-dirs)
1522 $(call cmd,rmfiles)
1523 @find . $(RCS_FIND_IGNORE) \
1524 \( -name '*.rmeta' \) \
1525 -type f -print | xargs rm -f
1526
1527 # distclean
1528 #
1529 PHONY += distclean
1530
1531 distclean: mrproper
1532 @find . $(RCS_FIND_IGNORE) \
1533 \( -name '*.orig' -o -name '*.rej' -o -name '*~' \
1534 -o -name '*.bak' -o -name '#*#' -o -name '*%' \
1535 -o -name 'core' -o -name tags -o -name TAGS -o -name 'cscope*' \
1536 -o -name GPATH -o -name GRTAGS -o -name GSYMS -o -name GTAGS \) \
1537 -type f -print | xargs rm -f
1538
1539
1540 # Packaging of the kernel to various formats
1541 # ---------------------------------------------------------------------------
1542
1543 %src-pkg: FORCE
1544 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1545 %pkg: include/config/kernel.release FORCE
1546 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.package $@
1547
1548 # Brief documentation of the typical targets used
1549 # ---------------------------------------------------------------------------
1550
1551 boards := $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*_defconfig)
1552 boards := $(sort $(notdir $(boards)))
1553 board-dirs := $(dir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/*/*_defconfig))
1554 board-dirs := $(sort $(notdir $(board-dirs:/=)))
1555
1556 PHONY += help
1557 help:
1558 @echo 'Cleaning targets:'
1559 @echo ' clean - Remove most generated files but keep the config and'
1560 @echo ' enough build support to build external modules'
1561 @echo ' mrproper - Remove all generated files + config + various backup files'
1562 @echo ' distclean - mrproper + remove editor backup and patch files'
1563 @echo ''
1564 @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
1565 @echo ''
1566 @echo 'Other generic targets:'
1567 @echo ' all - Build all targets marked with [*]'
1568 @echo '* vmlinux - Build the bare kernel'
1569 @echo '* modules - Build all modules'
1570 @echo ' modules_install - Install all modules to INSTALL_MOD_PATH (default: /)'
1571 @echo ' vdso_install - Install unstripped vdso to INSTALL_MOD_PATH (default: /)'
1572 @echo ' dir/ - Build all files in dir and below'
1573 @echo ' dir/file.[ois] - Build specified target only'
1574 @echo ' dir/file.ll - Build the LLVM assembly file'
1575 @echo ' (requires compiler support for LLVM assembly generation)'
1576 @echo ' dir/file.lst - Build specified mixed source/assembly target only'
1577 @echo ' (requires a recent binutils and recent build (System.map))'
1578 @echo ' dir/file.ko - Build module including final link'
1579 @echo ' modules_prepare - Set up for building external modules'
1580 @echo ' tags/TAGS - Generate tags file for editors'
1581 @echo ' cscope - Generate cscope index'
1582 @echo ' gtags - Generate GNU GLOBAL index'
1583 @echo ' kernelrelease - Output the release version string (use with make -s)'
1584 @echo ' kernelversion - Output the version stored in Makefile (use with make -s)'
1585 @echo ' image_name - Output the image name (use with make -s)'
1586 @echo ' headers_install - Install sanitised kernel headers to INSTALL_HDR_PATH'; \
1587 echo ' (default: $(INSTALL_HDR_PATH))'; \
1588 echo ''
1589 @echo 'Static analysers:'
1590 @echo ' checkstack - Generate a list of stack hogs and consider all functions'
1591 @echo ' with a stack size larger than MINSTACKSIZE (default: 100)'
1592 @echo ' versioncheck - Sanity check on version.h usage'
1593 @echo ' includecheck - Check for duplicate included header files'
1594 @echo ' export_report - List the usages of all exported symbols'
1595 @echo ' headerdep - Detect inclusion cycles in headers'
1596 @echo ' coccicheck - Check with Coccinelle'
1597 @echo ' clang-analyzer - Check with clang static analyzer'
1598 @echo ' clang-tidy - Check with clang-tidy'
1599 @echo ''
1600 @echo 'Tools:'
1601 @echo ' nsdeps - Generate missing symbol namespace dependencies'
1602 @echo ''
1603 @echo 'Kernel selftest:'
1604 @echo ' kselftest - Build and run kernel selftest'
1605 @echo ' Build, install, and boot kernel before'
1606 @echo ' running kselftest on it'
1607 @echo ' Run as root for full coverage'
1608 @echo ' kselftest-all - Build kernel selftest'
1609 @echo ' kselftest-install - Build and install kernel selftest'
1610 @echo ' kselftest-clean - Remove all generated kselftest files'
1611 @echo ' kselftest-merge - Merge all the config dependencies of'
1612 @echo ' kselftest to existing .config.'
1613 @echo ''
1614 @echo 'Rust targets:'
1615 @echo ' rustavailable - Checks whether the Rust toolchain is'
1616 @echo ' available and, if not, explains why.'
1617 @echo ' rustfmt - Reformat all the Rust code in the kernel'
1618 @echo ' rustfmtcheck - Checks if all the Rust code in the kernel'
1619 @echo ' is formatted, printing a diff otherwise.'
1620 @echo ' rustdoc - Generate Rust documentation'
1621 @echo ' (requires kernel .config)'
1622 @echo ' rusttest - Runs the Rust tests'
1623 @echo ' (requires kernel .config; downloads external repos)'
1624 @echo ' rust-analyzer - Generate rust-project.json rust-analyzer support file'
1625 @echo ' (requires kernel .config)'
1626 @echo ' dir/file.[os] - Build specified target only'
1627 @echo ' dir/file.rsi - Build macro expanded source, similar to C preprocessing.'
1628 @echo ' Run with RUSTFMT=n to skip reformatting if needed.'
1629 @echo ' The output is not intended to be compilable.'
1630 @echo ' dir/file.ll - Build the LLVM assembly file'
1631 @echo ''
1632 @$(if $(dtstree), \
1633 echo 'Devicetree:'; \
1634 echo '* dtbs - Build device tree blobs for enabled boards'; \
1635 echo ' dtbs_install - Install dtbs to $(INSTALL_DTBS_PATH)'; \
1636 echo ' dt_binding_check - Validate device tree binding documents and examples'; \
1637 echo ' dt_binding_schema - Build processed device tree binding schemas'; \
1638 echo ' dtbs_check - Validate device tree source files';\
1639 echo '')
1640
1641 @echo 'Userspace tools targets:'
1642 @echo ' use "make tools/help"'
1643 @echo ' or "cd tools; make help"'
1644 @echo ''
1645 @echo 'Kernel packaging:'
1646 @$(MAKE) -f $(srctree)/scripts/Makefile.package help
1647 @echo ''
1648 @echo 'Documentation targets:'
1649 @$(MAKE) -f $(srctree)/Documentation/Makefile dochelp
1650 @echo ''
1651 @echo 'Architecture-specific targets ($(SRCARCH)):'
1652 @$(or $(archhelp),\
1653 echo ' No architecture-specific help defined for $(SRCARCH)')
1654 @echo ''
1655 @$(if $(boards), \
1656 $(foreach b, $(boards), \
1657 printf " %-27s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \
1658 echo '')
1659 @$(if $(board-dirs), \
1660 $(foreach b, $(board-dirs), \
1661 printf " %-16s - Show %s-specific targets\\n" help-$(b) $(b);) \
1662 printf " %-16s - Show all of the above\\n" help-boards; \
1663 echo '')
1664
1665 @echo ' make V=n [targets] 1: verbose build'
1666 @echo ' 2: give reason for rebuild of target'
1667 @echo ' V=1 and V=2 can be combined with V=12'
1668 @echo ' make O=dir [targets] Locate all output files in "dir", including .config'
1669 @echo ' make C=1 [targets] Check re-compiled c source with $$CHECK'
1670 @echo ' (sparse by default)'
1671 @echo ' make C=2 [targets] Force check of all c source with $$CHECK'
1672 @echo ' make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
1673 @echo ' make W=n [targets] Enable extra build checks, n=1,2,3,c,e where'
1674 @echo ' 1: warnings which may be relevant and do not occur too often'
1675 @echo ' 2: warnings which occur quite often but may still be relevant'
1676 @echo ' 3: more obscure warnings, can most likely be ignored'
1677 @echo ' c: extra checks in the configuration stage (Kconfig)'
1678 @echo ' e: warnings are being treated as errors'
1679 @echo ' Multiple levels can be combined with W=12 or W=123'
1680 @$(if $(dtstree), \
1681 echo ' make CHECK_DTBS=1 [targets] Check all generated dtb files against schema'; \
1682 echo ' This can be applied both to "dtbs" and to individual "foo.dtb" targets' ; \
1683 )
1684 @echo ''
1685 @echo 'Execute "make" or "make all" to build all targets marked with [*] '
1686 @echo 'For further info see the ./README file'
1687
1688
1689 help-board-dirs := $(addprefix help-,$(board-dirs))
1690
1691 help-boards: $(help-board-dirs)
1692
1693 boards-per-dir = $(sort $(notdir $(wildcard $(srctree)/arch/$(SRCARCH)/configs/$*/*_defconfig)))
1694
1695 $(help-board-dirs): help-%:
1696 @echo 'Architecture-specific targets ($(SRCARCH) $*):'
1697 @$(if $(boards-per-dir), \
1698 $(foreach b, $(boards-per-dir), \
1699 printf " %-24s - Build for %s\\n" $*/$(b) $(subst _defconfig,,$(b));) \
1700 echo '')
1701
1702
1703 # Documentation targets
1704 # ---------------------------------------------------------------------------
1705 DOC_TARGETS := xmldocs latexdocs pdfdocs htmldocs epubdocs cleandocs \
1706 linkcheckdocs dochelp refcheckdocs texinfodocs infodocs
1707 PHONY += $(DOC_TARGETS)
1708 $(DOC_TARGETS):
1709 $(Q)$(MAKE) $(build)=Documentation $@
1710
1711
1712 # Rust targets
1713 # ---------------------------------------------------------------------------
1714
1715 # "Is Rust available?" target
1716 PHONY += rustavailable
1717 rustavailable:
1718 +$(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh && echo "Rust is available!"
1719
1720 # Documentation target
1721 #
1722 # Using the singular to avoid running afoul of `no-dot-config-targets`.
1723 PHONY += rustdoc
1724 rustdoc: prepare
1725 $(Q)$(MAKE) $(build)=rust $@
1726
1727 # Testing target
1728 PHONY += rusttest
1729 rusttest: prepare
1730 $(Q)$(MAKE) $(build)=rust $@
1731
1732 # Formatting targets
1733 PHONY += rustfmt rustfmtcheck
1734
1735 # We skip `rust/alloc` since we want to minimize the diff w.r.t. upstream.
1736 #
1737 # We match using absolute paths since `find` does not resolve them
1738 # when matching, which is a problem when e.g. `srctree` is `..`.
1739 # We `grep` afterwards in order to remove the directory entry itself.
1740 rustfmt:
1741 $(Q)find $(abs_srctree) -type f -name '*.rs' \
1742 -o -path $(abs_srctree)/rust/alloc -prune \
1743 -o -path $(abs_objtree)/rust/test -prune \
1744 | grep -Fv $(abs_srctree)/rust/alloc \
1745 | grep -Fv $(abs_objtree)/rust/test \
1746 | grep -Fv generated \
1747 | xargs $(RUSTFMT) $(rustfmt_flags)
1748
1749 rustfmtcheck: rustfmt_flags = --check
1750 rustfmtcheck: rustfmt
1751
1752 # Misc
1753 # ---------------------------------------------------------------------------
1754
1755 PHONY += misc-check
1756 misc-check:
1757 $(Q)$(srctree)/scripts/misc-check
1758
1759 all: misc-check
1760
1761 PHONY += scripts_gdb
1762 scripts_gdb: prepare0
1763 $(Q)$(MAKE) $(build)=scripts/gdb
1764 $(Q)ln -fsn $(abspath $(srctree)/scripts/gdb/vmlinux-gdb.py)
1765
1766 ifdef CONFIG_GDB_SCRIPTS
1767 all: scripts_gdb
1768 endif
1769
1770 else # KBUILD_EXTMOD
1771
1772 filechk_kernel.release = echo $(KERNELRELEASE)
1773
1774 ###
1775 # External module support.
1776 # When building external modules the kernel used as basis is considered
1777 # read-only, and no consistency checks are made and the make
1778 # system is not used on the basis kernel. If updates are required
1779 # in the basis kernel ordinary make commands (without M=...) must be used.
1780
1781 # We are always building only modules.
1782 KBUILD_BUILTIN :=
1783 KBUILD_MODULES := 1
1784
1785 build-dir := $(KBUILD_EXTMOD)
1786
1787 compile_commands.json: $(extmod_prefix)compile_commands.json
1788 PHONY += compile_commands.json
1789
1790 clean-dirs := $(KBUILD_EXTMOD)
1791 clean: private rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps \
1792 $(KBUILD_EXTMOD)/compile_commands.json
1793
1794 PHONY += prepare
1795 # now expand this into a simple variable to reduce the cost of shell evaluations
1796 prepare: CC_VERSION_TEXT := $(CC_VERSION_TEXT)
1797 prepare:
1798 @if [ "$(CC_VERSION_TEXT)" != "$(CONFIG_CC_VERSION_TEXT)" ]; then \
1799 echo >&2 "warning: the compiler differs from the one used to build the kernel"; \
1800 echo >&2 " The kernel was built by: $(CONFIG_CC_VERSION_TEXT)"; \
1801 echo >&2 " You are using: $(CC_VERSION_TEXT)"; \
1802 fi
1803
1804 PHONY += help
1805 help:
1806 @echo ' Building external modules.'
1807 @echo ' Syntax: make -C path/to/kernel/src M=$$PWD target'
1808 @echo ''
1809 @echo ' modules - default target, build the module(s)'
1810 @echo ' modules_install - install the module'
1811 @echo ' clean - remove generated files in module directory only'
1812 @echo ' rust-analyzer - generate rust-project.json rust-analyzer support file'
1813 @echo ''
1814
1815 ifndef CONFIG_MODULES
1816 modules modules_install: __external_modules_error
1817 __external_modules_error:
1818 @echo >&2 '***'
1819 @echo >&2 '*** The present kernel disabled CONFIG_MODULES.'
1820 @echo >&2 '*** You cannot build or install external modules.'
1821 @echo >&2 '***'
1822 @false
1823 endif
1824
1825 endif # KBUILD_EXTMOD
1826
1827 # ---------------------------------------------------------------------------
1828 # Modules
1829
1830 PHONY += modules modules_install modules_sign modules_prepare
1831
1832 modules_install:
1833 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst \
1834 sign-only=$(if $(filter modules_install,$(MAKECMDGOALS)),,y)
1835
1836 ifeq ($(CONFIG_MODULE_SIG),y)
1837 # modules_sign is a subset of modules_install.
1838 # 'make modules_install modules_sign' is equivalent to 'make modules_install'.
1839 modules_sign: modules_install
1840 @:
1841 else
1842 modules_sign:
1843 @echo >&2 '***'
1844 @echo >&2 '*** CONFIG_MODULE_SIG is disabled. You cannot sign modules.'
1845 @echo >&2 '***'
1846 @false
1847 endif
1848
1849 ifdef CONFIG_MODULES
1850
1851 $(MODORDER): $(build-dir)
1852 @:
1853
1854 # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
1855 # This is solely useful to speed up test compiles.
1856 modules: modpost
1857 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1858 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1859 endif
1860
1861 PHONY += modules_check
1862 modules_check: $(MODORDER)
1863 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/modules-check.sh $<
1864
1865 else # CONFIG_MODULES
1866
1867 modules:
1868 @:
1869
1870 KBUILD_MODULES :=
1871
1872 endif # CONFIG_MODULES
1873
1874 PHONY += modpost
1875 modpost: $(if $(single-build),, $(if $(KBUILD_BUILTIN), vmlinux.o)) \
1876 $(if $(KBUILD_MODULES), modules_check)
1877 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1878
1879 # Single targets
1880 # ---------------------------------------------------------------------------
1881 # To build individual files in subdirectories, you can do like this:
1882 #
1883 # make foo/bar/baz.s
1884 #
1885 # The supported suffixes for single-target are listed in 'single-targets'
1886 #
1887 # To build only under specific subdirectories, you can do like this:
1888 #
1889 # make foo/bar/baz/
1890
1891 ifdef single-build
1892
1893 # .ko is special because modpost is needed
1894 single-ko := $(sort $(filter %.ko, $(MAKECMDGOALS)))
1895 single-no-ko := $(filter-out $(single-ko), $(MAKECMDGOALS)) \
1896 $(foreach x, o mod, $(patsubst %.ko, %.$x, $(single-ko)))
1897
1898 $(single-ko): single_modules
1899 @:
1900 $(single-no-ko): $(build-dir)
1901 @:
1902
1903 # Remove MODORDER when done because it is not the real one.
1904 PHONY += single_modules
1905 single_modules: $(single-no-ko) modules_prepare
1906 $(Q){ $(foreach m, $(single-ko), echo $(extmod_prefix)$(m:%.ko=%.o);) } > $(MODORDER)
1907 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
1908 ifneq ($(KBUILD_MODPOST_NOFINAL),1)
1909 $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
1910 endif
1911 $(Q)rm -f $(MODORDER)
1912
1913 single-goals := $(addprefix $(build-dir)/, $(single-no-ko))
1914
1915 KBUILD_MODULES := 1
1916
1917 endif
1918
1919 # Preset locale variables to speed up the build process. Limit locale
1920 # tweaks to this spot to avoid wrong language settings when running
1921 # make menuconfig etc.
1922 # Error messages still appears in the original language
1923 PHONY += $(build-dir)
1924 $(build-dir): prepare
1925 $(Q)$(MAKE) $(build)=$@ need-builtin=1 need-modorder=1 $(single-goals)
1926
1927 clean-dirs := $(addprefix _clean_, $(clean-dirs))
1928 PHONY += $(clean-dirs) clean
1929 $(clean-dirs):
1930 $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)
1931
1932 clean: $(clean-dirs)
1933 $(call cmd,rmfiles)
1934 @find $(or $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
1935 \( -name '*.[aios]' -o -name '*.rsi' -o -name '*.ko' -o -name '.*.cmd' \
1936 -o -name '*.ko.*' \
1937 -o -name '*.dtb' -o -name '*.dtbo' \
1938 -o -name '*.dtb.S' -o -name '*.dtbo.S' \
1939 -o -name '*.dt.yaml' -o -name 'dtbs-list' \
1940 -o -name '*.dwo' -o -name '*.lst' \
1941 -o -name '*.su' -o -name '*.mod' \
1942 -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
1943 -o -name '*.lex.c' -o -name '*.tab.[ch]' \
1944 -o -name '*.asn1.[ch]' \
1945 -o -name '*.symtypes' -o -name 'modules.order' \
1946 -o -name '*.c.[012]*.*' \
1947 -o -name '*.ll' \
1948 -o -name '*.gcno' \
1949 -o -name '*.*.symversions' \) -type f -print \
1950 -o -name '.tmp_*' -print \
1951 | xargs rm -rf
1952
1953 # Generate tags for editors
1954 # ---------------------------------------------------------------------------
1955 quiet_cmd_tags = GEN $@
1956 cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
1957
1958 tags TAGS cscope gtags: FORCE
1959 $(call cmd,tags)
1960
1961 # Generate rust-project.json (a file that describes the structure of non-Cargo
1962 # Rust projects) for rust-analyzer (an implementation of the Language Server
1963 # Protocol).
1964 PHONY += rust-analyzer
1965 rust-analyzer:
1966 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/rust_is_available.sh
1967 $(Q)$(MAKE) $(build)=rust $@
1968
1969 # Script to generate missing namespace dependencies
1970 # ---------------------------------------------------------------------------
1971
1972 PHONY += nsdeps
1973 nsdeps: export KBUILD_NSDEPS=1
1974 nsdeps: modules
1975 $(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
1976
1977 # Clang Tooling
1978 # ---------------------------------------------------------------------------
1979
1980 quiet_cmd_gen_compile_commands = GEN $@
1981 cmd_gen_compile_commands = $(PYTHON3) $< -a $(AR) -o $@ $(filter-out $<, $(real-prereqs))
1982
1983 $(extmod_prefix)compile_commands.json: scripts/clang-tools/gen_compile_commands.py \
1984 $(if $(KBUILD_EXTMOD),, vmlinux.a $(KBUILD_VMLINUX_LIBS)) \
1985 $(if $(CONFIG_MODULES), $(MODORDER)) FORCE
1986 $(call if_changed,gen_compile_commands)
1987
1988 targets += $(extmod_prefix)compile_commands.json
1989
1990 PHONY += clang-tidy clang-analyzer
1991
1992 ifdef CONFIG_CC_IS_CLANG
1993 quiet_cmd_clang_tools = CHECK $<
1994 cmd_clang_tools = $(PYTHON3) $(srctree)/scripts/clang-tools/run-clang-tools.py $@ $<
1995
1996 clang-tidy clang-analyzer: $(extmod_prefix)compile_commands.json
1997 $(call cmd,clang_tools)
1998 else
1999 clang-tidy clang-analyzer:
2000 @echo "$@ requires CC=clang" >&2
2001 @false
2002 endif
2003
2004 # Scripts to check various things for consistency
2005 # ---------------------------------------------------------------------------
2006
2007 PHONY += includecheck versioncheck coccicheck export_report
2008
2009 includecheck:
2010 find $(srctree)/* $(RCS_FIND_IGNORE) \
2011 -name '*.[hcS]' -type f -print | sort \
2012 | xargs $(PERL) -w $(srctree)/scripts/checkincludes.pl
2013
2014 versioncheck:
2015 find $(srctree)/* $(RCS_FIND_IGNORE) \
2016 -name '*.[hcS]' -type f -print | sort \
2017 | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
2018
2019 coccicheck:
2020 $(Q)$(BASH) $(srctree)/scripts/$@
2021
2022 export_report:
2023 $(PERL) $(srctree)/scripts/export_report.pl
2024
2025 PHONY += checkstack kernelrelease kernelversion image_name
2026
2027 # UML needs a little special treatment here. It wants to use the host
2028 # toolchain, so needs $(SUBARCH) passed to checkstack.pl. Everyone
2029 # else wants $(ARCH), including people doing cross-builds, which means
2030 # that $(SUBARCH) doesn't work here.
2031 ifeq ($(ARCH), um)
2032 CHECKSTACK_ARCH := $(SUBARCH)
2033 else
2034 CHECKSTACK_ARCH := $(ARCH)
2035 endif
2036 MINSTACKSIZE ?= 100
2037 checkstack:
2038 $(OBJDUMP) -d vmlinux $$(find . -name '*.ko') | \
2039 $(PERL) $(srctree)/scripts/checkstack.pl $(CHECKSTACK_ARCH) $(MINSTACKSIZE)
2040
2041 kernelrelease:
2042 @$(filechk_kernel.release)
2043
2044 kernelversion:
2045 @echo $(KERNELVERSION)
2046
2047 image_name:
2048 @echo $(KBUILD_IMAGE)
2049
2050 PHONY += run-command
2051 run-command:
2052 $(Q)$(KBUILD_RUN_COMMAND)
2053
2054 quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files)))
2055 cmd_rmfiles = rm -rf $(rm-files)
2056
2057 # read saved command lines for existing targets
2058 existing-targets := $(wildcard $(sort $(targets)))
2059
2060 -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
2061
2062 endif # config-build
2063 endif # mixed-build
2064 endif # need-sub-make
2065
2066 PHONY += FORCE
2067 FORCE:
2068
2069 # Declare the contents of the PHONY variable as phony. We keep that
2070 # information in a variable so we can use it in if_changed and friends.
2071 .PHONY: $(PHONY)
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