1 # SPDX-License-Identifier: GPL-2.0
3 # Where to place rustdoc generated documentation
4 rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc
6 obj-$(CONFIG_RUST) += core.o compiler_builtins.o
7 always-$(CONFIG_RUST) += exports_core_generated.h
9 # Missing prototypes are expected in the helpers since these are exported
10 # for Rust only, thus there is no header nor prototypes.
11 obj-$(CONFIG_RUST) += helpers.o
12 CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations
14 always-$(CONFIG_RUST) += libmacros.so
15 no-clean-files += libmacros.so
17 always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
18 obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
19 always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
20 exports_kernel_generated.h
22 always-$(CONFIG_RUST) += uapi/uapi_generated.rs
23 obj-$(CONFIG_RUST) += uapi.o
25 ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
26 obj-$(CONFIG_RUST) += build_error.o
28 always-$(CONFIG_RUST) += build_error.o
31 obj-$(CONFIG_RUST) += exports.o
33 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
34 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
36 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
37 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
39 # Avoids running `$(RUSTC)` for the sysroot when it may not be available.
42 # `$(rust_flags)` is passed in case the user added `--sysroot`.
43 rustc_sysroot := $(shell MAKEFLAGS= $(RUSTC) $(rust_flags) --print sysroot)
44 rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
45 RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
47 ifeq ($(quiet),silent_)
50 rustdoc_test_quiet=--test-args -q
51 rustdoc_test_kernel_quiet=>/dev/null
52 else ifeq ($(quiet),quiet_)
54 rustdoc_test_quiet=--test-args -q
55 rustdoc_test_kernel_quiet=>/dev/null
64 --cfg no_global_oom_handling \
68 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
70 OBJTREE=$(abspath $(objtree)) \
71 $(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
72 $(rustc_target_flags) -L$(objtree)/$(obj) \
73 --output $(rustdoc_output) \
74 --crate-name $(subst rustdoc-,,$@) \
75 $(if $(rustdoc_host),,--sysroot=/dev/null) \
76 @$(objtree)/include/generated/rustc_cfg $<
78 # The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
79 # can be used to specify a custom logo. However:
80 # - The given value is used as-is, thus it cannot be relative or a local file
81 # (unlike the non-custom case) since the generated docs have subfolders.
82 # - It requires adding it to every crate.
83 # - It requires changing `core` which comes from the sysroot.
85 # Using `-Zcrate-attr` would solve the last two points, but not the first.
86 # The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
87 # command-like flags to solve the issue. Meanwhile, we use the non-custom case
88 # and then retouch the generated files.
89 rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
90 rustdoc-alloc rustdoc-kernel
91 $(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
92 $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
93 $(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
94 -e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
95 -e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
96 -e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
97 -e 's:<a href="srctree/([^"]+)">:<a href="$(realpath $(srctree))/\1">:g'
98 $(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
99 echo ".logo-container > img { object-fit: contain; }" >> $$f; done
101 rustdoc-macros: private rustdoc_host = yes
102 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
104 rustdoc-macros: $(src)/macros/lib.rs FORCE
105 +$(call if_changed,rustdoc)
107 rustdoc-core: private rustc_target_flags = $(core-cfgs)
108 rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
109 +$(call if_changed,rustdoc)
111 rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
112 +$(call if_changed,rustdoc)
114 # We need to allow `rustdoc::broken_intra_doc_links` because some
115 # `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
116 # functions. Ideally `rustdoc` would have a way to distinguish broken links
117 # due to things that are "configured out" vs. entirely non-existing ones.
118 rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
119 -Arustdoc::broken_intra_doc_links
120 rustdoc-alloc: $(RUST_LIB_SRC)/alloc/src/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
121 +$(call if_changed,rustdoc)
123 rustdoc-kernel: private rustc_target_flags = --extern alloc \
124 --extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
125 --extern bindings --extern uapi
126 rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
127 rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
128 $(obj)/bindings.o FORCE
129 +$(call if_changed,rustdoc)
131 quiet_cmd_rustc_test_library = RUSTC TL $<
132 cmd_rustc_test_library = \
133 OBJTREE=$(abspath $(objtree)) \
134 $(RUSTC) $(rust_common_flags) \
135 @$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
136 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
137 --out-dir $(objtree)/$(obj)/test --cfg testlib \
138 --sysroot $(objtree)/$(obj)/test/sysroot \
139 -L$(objtree)/$(obj)/test \
140 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
142 rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
143 +$(call if_changed,rustc_test_library)
145 rusttestlib-macros: private rustc_target_flags = --extern proc_macro
146 rusttestlib-macros: private rustc_test_library_proc = yes
147 rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
148 +$(call if_changed,rustc_test_library)
150 rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE
151 +$(call if_changed,rustc_test_library)
153 rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE
154 +$(call if_changed,rustc_test_library)
156 quiet_cmd_rustdoc_test = RUSTDOC T $<
158 OBJTREE=$(abspath $(objtree)) \
159 $(RUSTDOC) --test $(rust_common_flags) \
160 @$(objtree)/include/generated/rustc_cfg \
161 $(rustc_target_flags) $(rustdoc_test_target_flags) \
162 --sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
163 -L$(objtree)/$(obj)/test --output $(rustdoc_output) \
164 --crate-name $(subst rusttest-,,$@) $<
166 quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
167 cmd_rustdoc_test_kernel = \
168 rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
169 mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
170 OBJTREE=$(abspath $(objtree)) \
171 $(RUSTDOC) --test $(rust_flags) \
172 -L$(objtree)/$(obj) --extern alloc --extern kernel \
173 --extern build_error --extern macros \
174 --extern bindings --extern uapi \
175 --no-run --crate-name kernel -Zunstable-options \
176 --sysroot=/dev/null \
177 --test-builder $(objtree)/scripts/rustdoc_test_builder \
178 $< $(rustdoc_test_kernel_quiet); \
179 $(objtree)/scripts/rustdoc_test_gen
181 %/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
182 $(src)/kernel/lib.rs $(obj)/kernel.o \
183 $(objtree)/scripts/rustdoc_test_builder \
184 $(objtree)/scripts/rustdoc_test_gen FORCE
185 +$(call if_changed,rustdoc_test_kernel)
187 # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
188 # so for the moment we skip `-Cpanic=abort`.
189 quiet_cmd_rustc_test = RUSTC T $<
191 OBJTREE=$(abspath $(objtree)) \
192 $(RUSTC) --test $(rust_common_flags) \
193 @$(objtree)/include/generated/rustc_cfg \
194 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
195 --sysroot $(objtree)/$(obj)/test/sysroot \
196 -L$(objtree)/$(obj)/test \
197 --crate-name $(subst rusttest-,,$@) $<; \
198 $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
199 $(rustc_test_run_flags)
201 rusttest: rusttest-macros rusttest-kernel
203 # This prepares a custom sysroot with our custom `alloc` instead of
206 # This requires several hacks:
207 # - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,
208 # including third-party crates that need to be downloaded, plus custom
209 # `build.rs` steps. Thus hardcoding things here is not maintainable.
210 # - `cargo` knows how to build the standard library, but it is an unstable
211 # feature so far (`-Zbuild-std`).
212 # - `cargo` only considers the use case of building the standard library
213 # to use it in a given package. Thus we need to create a dummy package
214 # and pick the generated libraries from there.
215 # - The usual ways of modifying the dependency graph in `cargo` do not seem
216 # to apply for the `-Zbuild-std` steps, thus we have to mislead it
217 # by modifying the sources in the sysroot.
218 # - To avoid messing with the user's Rust installation, we create a clone
219 # of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`
220 # steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.
222 # In the future, we hope to avoid the whole ordeal by either:
223 # - Making the `test` crate not depend on `std` (either improving upstream
224 # or having our own custom crate).
225 # - Making the tests run in kernel space (requires the previous point).
226 # - Making `std` and friends be more like a "normal" crate, so that
227 # `-Zbuild-std` and related hacks are not needed.
228 quiet_cmd_rustsysroot = RUSTSYSROOT
230 rm -rf $(objtree)/$(obj)/test; \
231 mkdir -p $(objtree)/$(obj)/test; \
232 cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \
233 echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \
234 echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \
235 >> $(objtree)/$(obj)/test/rustc_sysroot; \
236 chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \
237 $(CARGO) -q new $(objtree)/$(obj)/test/dummy; \
238 RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \
239 test -Zbuild-std --target $(rustc_host_target) \
240 --manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \
241 rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \
242 cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \
243 $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib
245 rusttest-prepare: FORCE
246 +$(call if_changed,rustsysroot)
248 rusttest-macros: private rustc_target_flags = --extern proc_macro
249 rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
250 rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
251 +$(call if_changed,rustc_test)
252 +$(call if_changed,rustdoc_test)
254 rusttest-kernel: private rustc_target_flags = --extern alloc \
255 --extern build_error --extern macros --extern bindings --extern uapi
256 rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
257 rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
258 rusttestlib-uapi FORCE
259 +$(call if_changed,rustc_test)
260 +$(call if_changed,rustc_test_library)
262 ifdef CONFIG_CC_IS_CLANG
263 bindgen_c_flags = $(c_flags)
265 # bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
266 # plugin backend and/or the Clang driver would be perfectly compatible with GCC.
268 # For the moment, here we are tweaking the flags on the fly. This is a hack,
269 # and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
270 # if we end up using one of those structs).
271 bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
272 -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
273 -mindirect-branch=thunk-extern -mindirect-branch-register \
274 -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
275 -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
276 -mno-pointers-to-nested-functions -mno-string \
277 -mno-strict-align -mstrict-align \
278 -fconserve-stack -falign-jumps=% -falign-loops=% \
279 -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
280 -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
281 -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
282 -fzero-call-used-regs=% -fno-stack-clash-protection \
283 -fno-inline-functions-called-once -fsanitize=bounds-strict \
284 -fstrict-flex-arrays=% \
285 --param=% --param asan-%
287 # Derived from `scripts/Makefile.clang`.
288 BINDGEN_TARGET_x86 := x86_64-linux-gnu
289 BINDGEN_TARGET_arm64 := aarch64-linux-gnu
290 BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))
292 # All warnings are inhibited since GCC builds are very experimental,
293 # many GCC warnings are not supported by Clang, they may only appear in
294 # some configurations, with new GCC versions, etc.
295 bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
297 # Auto variable zero-initialization requires an additional special option with
298 # clang that is going to be removed sometime in the future (likely in
299 # clang-18), so make sure to pass this option only if clang supports it
300 # (libclang major version < 16).
302 # https://github.com/llvm/llvm-project/issues/44842
303 # https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
304 ifdef CONFIG_INIT_STACK_ALL_ZERO
305 libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
306 ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
307 bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
311 bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
312 $(bindgen_extra_c_flags)
316 bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
318 bindgen_c_flags_lto = $(bindgen_c_flags)
321 bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__
323 quiet_cmd_bindgen = BINDGEN $@
325 $(BINDGEN) $< $(bindgen_target_flags) \
326 --use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
328 -o $@ -- $(bindgen_c_flags_final) -DMODULE \
329 $(bindgen_target_cflags) $(bindgen_target_extra)
331 $(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
332 $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)
333 $(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \
334 sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@
335 $(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
336 $(src)/bindgen_parameters FORCE
337 $(call if_changed_dep,bindgen)
339 $(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
340 $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)
341 $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
342 $(src)/bindgen_parameters FORCE
343 $(call if_changed_dep,bindgen)
345 # See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
346 # with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
347 # given it is `libclang`; but for consistency, future Clang changes and/or
348 # a potential future GCC backend for `bindgen`, we disable it too.
349 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
350 --blocklist-type '.*' --allowlist-var '' \
351 --allowlist-function 'rust_helper_.*'
352 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
353 -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
354 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
355 sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@
356 $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
357 $(call if_changed_dep,bindgen)
359 quiet_cmd_exports = EXPORTS $@
361 $(NM) -p --defined-only $< \
362 | awk '/ (T|R|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
364 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
365 $(call if_changed,exports)
367 $(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
368 $(call if_changed,exports)
370 $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
371 $(call if_changed,exports)
373 $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
374 $(call if_changed,exports)
376 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
377 cmd_rustc_procmacro = \
378 $(RUSTC_OR_CLIPPY) $(rust_common_flags) \
379 -Clinker-flavor=gcc -Clinker=$(HOSTCC) \
380 -Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \
381 --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
382 --crate-type proc-macro \
383 --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
385 # Procedural macros can only be used with the `rustc` that compiled it.
386 # Therefore, to get `libmacros.so` automatically recompiled when the compiler
387 # version changes, we add `core.o` as a dependency (even if it is not needed).
388 $(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE
389 +$(call if_changed_dep,rustc_procmacro)
391 quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
392 cmd_rustc_library = \
393 OBJTREE=$(abspath $(objtree)) \
394 $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
395 $(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
396 --emit=dep-info=$(depfile) --emit=obj=$@ \
397 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
398 --crate-type rlib -L$(objtree)/$(obj) \
399 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
400 --sysroot=/dev/null \
401 $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
404 $(Q)$(srctree)/scripts/generate_rust_analyzer.py \
405 --cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
406 $(realpath $(srctree)) $(realpath $(objtree)) \
407 $(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
408 $(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
410 redirect-intrinsics = \
411 __addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
412 __adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
414 __udivmodti4 __udivti3 __umodti3
416 ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
417 # These intrinsics are defined for ARM64 and RISCV64
418 redirect-intrinsics += \
423 $(obj)/core.o: private skip_clippy = 1
424 $(obj)/core.o: private skip_flags = -Dunreachable_pub
425 $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
426 $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
427 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
428 +$(call if_changed_dep,rustc_library)
429 ifneq ($(or $(CONFIG_X86_64),$(CONFIG_LOONGARCH)),)
430 $(obj)/core.o: scripts/target.json
433 $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
434 $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
435 +$(call if_changed_dep,rustc_library)
437 $(obj)/alloc.o: private skip_clippy = 1
438 $(obj)/alloc.o: private skip_flags = -Dunreachable_pub
439 $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
440 $(obj)/alloc.o: $(RUST_LIB_SRC)/alloc/src/lib.rs $(obj)/compiler_builtins.o FORCE
441 +$(call if_changed_dep,rustc_library)
443 $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
444 +$(call if_changed_dep,rustc_library)
446 $(obj)/bindings.o: $(src)/bindings/lib.rs \
447 $(obj)/compiler_builtins.o \
448 $(obj)/bindings/bindings_generated.rs \
449 $(obj)/bindings/bindings_helpers_generated.rs FORCE
450 +$(call if_changed_dep,rustc_library)
452 $(obj)/uapi.o: $(src)/uapi/lib.rs \
453 $(obj)/compiler_builtins.o \
454 $(obj)/uapi/uapi_generated.rs FORCE
455 +$(call if_changed_dep,rustc_library)
457 $(obj)/kernel.o: private rustc_target_flags = --extern alloc \
458 --extern build_error --extern macros --extern bindings --extern uapi
459 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
460 $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
461 +$(call if_changed_dep,rustc_library)