rust/Makefile - pub/scm/linux/kernel/git/dgc/linux-xfs - Git at Google


            
            # SPDX-License-Identifier: GPL-2.0


            # Where to place rustdoc generated documentation

            
            rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc


            obj-$(CONFIG_RUST) += core.o compiler_builtins.o

            
            always-$(CONFIG_RUST) += exports_core_generated.h


            # Missing prototypes are expected in the helpers since these are exported

            
            # for Rust only, thus there is no header nor prototypes.

            
            obj-$(CONFIG_RUST) += helpers.o

            
            CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations


            always-$(CONFIG_RUST) += libmacros.so

            
            no-clean-files += libmacros.so


            always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs

            
            obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o

            
            always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \

            
                exports_kernel_generated.h


            always-$(CONFIG_RUST) += uapi/uapi_generated.rs

            
            obj-$(CONFIG_RUST) += uapi.o


            ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW

            
            obj-$(CONFIG_RUST) += build_error.o

            
            else

            
            always-$(CONFIG_RUST) += build_error.o

            
            endif


            obj-$(CONFIG_RUST) += exports.o


            always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs

            
            always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c


            obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o

            
            obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o


            # Avoids running `$(RUSTC)` for the sysroot when it may not be available.

            
            ifdef CONFIG_RUST


            # `$(rust_flags)` is passed in case the user added `--sysroot`.

            
            rustc_sysroot := $(shell $(RUSTC) $(rust_flags) --print sysroot)

            
            rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)

            
            RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library


            ifeq ($(quiet),silent_)

            
            cargo_quiet=-q

            
            rust_test_quiet=-q

            
            rustdoc_test_quiet=--test-args -q

            
            rustdoc_test_kernel_quiet=>/dev/null

            
            else ifeq ($(quiet),quiet_)

            
            rust_test_quiet=-q

            
            rustdoc_test_quiet=--test-args -q

            
            rustdoc_test_kernel_quiet=>/dev/null

            
            else

            
            cargo_quiet=--verbose

            
            endif


            core-cfgs = \

            
                --cfg no_fp_fmt_parse


            alloc-cfgs = \

            
                --cfg no_borrow \

            
                --cfg no_fmt \

            
                --cfg no_global_oom_handling \

            
                --cfg no_macros \

            
                --cfg no_rc \

            
                --cfg no_str \

            
                --cfg no_string \

            
                --cfg no_sync \

            
                --cfg no_thin


            quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<

            
                  cmd_rustdoc = \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \

            
            		$(rustc_target_flags) -L$(objtree)/$(obj) \

            
            		--output $(rustdoc_output) \

            
            		--crate-name $(subst rustdoc-,,$@) \

            
            		@$(objtree)/include/generated/rustc_cfg $<


            # The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute

            
            # can be used to specify a custom logo. However:

            
            #   - The given value is used as-is, thus it cannot be relative or a local file

            
            #     (unlike the non-custom case) since the generated docs have subfolders.

            
            #   - It requires adding it to every crate.

            
            #   - It requires changing `core` which comes from the sysroot.

            
            #

            
            # Using `-Zcrate-attr` would solve the last two points, but not the first.

            
            # The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new

            
            # command-like flags to solve the issue. Meanwhile, we use the non-custom case

            
            # and then retouch the generated files.

            
            rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \

            
                rustdoc-alloc rustdoc-kernel

            
            	$(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/

            
            	$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/

            
            	$(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \

            
            		-e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \

            
            		-e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \

            
            		-e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g'

            
            	$(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \

            
            		echo ".logo-container > img { object-fit: contain; }" >> $$f; done


            rustdoc-macros: private rustdoc_host = yes

            
            rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \

            
                --extern proc_macro

            
            rustdoc-macros: $(src)/macros/lib.rs FORCE

            
            	$(call if_changed,rustdoc)


            rustdoc-core: private rustc_target_flags = $(core-cfgs)

            
            rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE

            
            	$(call if_changed,rustdoc)


            rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE

            
            	$(call if_changed,rustdoc)


            # We need to allow `rustdoc::broken_intra_doc_links` because some

            
            # `no_global_oom_handling` functions refer to non-`no_global_oom_handling`

            
            # functions. Ideally `rustdoc` would have a way to distinguish broken links

            
            # due to things that are "configured out" vs. entirely non-existing ones.

            
            rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \

            
                -Arustdoc::broken_intra_doc_links

            
            rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE

            
            	$(call if_changed,rustdoc)


            rustdoc-kernel: private rustc_target_flags = --extern alloc \

            
                --extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \

            
                --extern bindings --extern uapi

            
            rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \

            
                rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \

            
                $(obj)/bindings.o FORCE

            
            	$(call if_changed,rustdoc)


            quiet_cmd_rustc_test_library = RUSTC TL $<

            
                  cmd_rustc_test_library = \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(RUSTC) $(rust_common_flags) \

            
            		@$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \

            
            		--crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \

            
            		--out-dir $(objtree)/$(obj)/test --cfg testlib \

            
            		--sysroot $(objtree)/$(obj)/test/sysroot \

            
            		-L$(objtree)/$(obj)/test \

            
            		--crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<


            rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE

            
            	$(call if_changed,rustc_test_library)


            rusttestlib-macros: private rustc_target_flags = --extern proc_macro

            
            rusttestlib-macros: private rustc_test_library_proc = yes

            
            rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE

            
            	$(call if_changed,rustc_test_library)


            rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE

            
            	$(call if_changed,rustc_test_library)


            rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE

            
            	$(call if_changed,rustc_test_library)


            quiet_cmd_rustdoc_test = RUSTDOC T $<

            
                  cmd_rustdoc_test = \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(RUSTDOC) --test $(rust_common_flags) \

            
            		@$(objtree)/include/generated/rustc_cfg \

            
            		$(rustc_target_flags) $(rustdoc_test_target_flags) \

            
            		--sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \

            
            		-L$(objtree)/$(obj)/test --output $(rustdoc_output) \

            
            		--crate-name $(subst rusttest-,,$@) $<


            quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<

            
                  cmd_rustdoc_test_kernel = \

            
            	rm -rf $(objtree)/$(obj)/test/doctests/kernel; \

            
            	mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(RUSTDOC) --test $(rust_flags) \

            
            		@$(objtree)/include/generated/rustc_cfg \

            
            		-L$(objtree)/$(obj) --extern alloc --extern kernel \

            
            		--extern build_error --extern macros \

            
            		--extern bindings --extern uapi \

            
            		--no-run --crate-name kernel -Zunstable-options \

            
            		--test-builder $(objtree)/scripts/rustdoc_test_builder \

            
            		$< $(rustdoc_test_kernel_quiet); \

            
            	$(objtree)/scripts/rustdoc_test_gen


            %/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \

            
                $(src)/kernel/lib.rs $(obj)/kernel.o \

            
                $(objtree)/scripts/rustdoc_test_builder \

            
                $(objtree)/scripts/rustdoc_test_gen FORCE

            
            	$(call if_changed,rustdoc_test_kernel)


            # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,

            
            # so for the moment we skip `-Cpanic=abort`.

            
            quiet_cmd_rustc_test = RUSTC T  $<

            
                  cmd_rustc_test = \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(RUSTC) --test $(rust_common_flags) \

            
            		@$(objtree)/include/generated/rustc_cfg \

            
            		$(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \

            
            		--sysroot $(objtree)/$(obj)/test/sysroot \

            
            		-L$(objtree)/$(obj)/test \

            
            		--crate-name $(subst rusttest-,,$@) $<; \

            
            	$(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \

            
            		$(rustc_test_run_flags)


            rusttest: rusttest-macros rusttest-kernel


            # This prepares a custom sysroot with our custom `alloc` instead of

            
            # the standard one.

            
            #

            
            # This requires several hacks:

            
            #   - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,

            
            #     including third-party crates that need to be downloaded, plus custom

            
            #     `build.rs` steps. Thus hardcoding things here is not maintainable.

            
            #   - `cargo` knows how to build the standard library, but it is an unstable

            
            #     feature so far (`-Zbuild-std`).

            
            #   - `cargo` only considers the use case of building the standard library

            
            #     to use it in a given package. Thus we need to create a dummy package

            
            #     and pick the generated libraries from there.

            
            #   - Since we only keep a subset of upstream `alloc` in-tree, we need

            
            #     to recreate it on the fly by putting our sources on top.

            
            #   - The usual ways of modifying the dependency graph in `cargo` do not seem

            
            #     to apply for the `-Zbuild-std` steps, thus we have to mislead it

            
            #     by modifying the sources in the sysroot.

            
            #   - To avoid messing with the user's Rust installation, we create a clone

            
            #     of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`

            
            #     steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.

            
            #

            
            # In the future, we hope to avoid the whole ordeal by either:

            
            #   - Making the `test` crate not depend on `std` (either improving upstream

            
            #     or having our own custom crate).

            
            #   - Making the tests run in kernel space (requires the previous point).

            
            #   - Making `std` and friends be more like a "normal" crate, so that

            
            #     `-Zbuild-std` and related hacks are not needed.

            
            quiet_cmd_rustsysroot = RUSTSYSROOT

            
                  cmd_rustsysroot = \

            
            	rm -rf $(objtree)/$(obj)/test; \

            
            	mkdir -p $(objtree)/$(obj)/test; \

            
            	cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \

            
            	cp -r $(srctree)/$(src)/alloc/* \

            
            		$(objtree)/$(obj)/test/sysroot/lib/rustlib/src/rust/library/alloc/src; \

            
            	echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \

            
            	echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \

            
            		>> $(objtree)/$(obj)/test/rustc_sysroot; \

            
            	chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \

            
            	$(CARGO) -q new $(objtree)/$(obj)/test/dummy; \

            
            	RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \

            
            		test -Zbuild-std --target $(rustc_host_target) \

            
            		--manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \

            
            	rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \

            
            	cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \

            
            		$(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib


            rusttest-prepare: FORCE

            
            	$(call if_changed,rustsysroot)


            rusttest-macros: private rustc_target_flags = --extern proc_macro

            
            rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro

            
            rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE

            
            	$(call if_changed,rustc_test)

            
            	$(call if_changed,rustdoc_test)


            rusttest-kernel: private rustc_target_flags = --extern alloc \

            
                --extern build_error --extern macros --extern bindings --extern uapi

            
            rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \

            
                rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \

            
                rusttestlib-uapi FORCE

            
            	$(call if_changed,rustc_test)

            
            	$(call if_changed,rustc_test_library)


            ifdef CONFIG_CC_IS_CLANG

            
            bindgen_c_flags = $(c_flags)

            
            else

            
            # bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC

            
            # plugin backend and/or the Clang driver would be perfectly compatible with GCC.

            
            #

            
            # For the moment, here we are tweaking the flags on the fly. This is a hack,

            
            # and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`

            
            # if we end up using one of those structs).

            
            bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \

            
            	-mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \

            
            	-mindirect-branch=thunk-extern -mindirect-branch-register \

            
            	-mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \

            
            	-mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \

            
            	-mno-pointers-to-nested-functions -mno-string \

            
            	-mno-strict-align -mstrict-align \

            
            	-fconserve-stack -falign-jumps=% -falign-loops=% \

            
            	-femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \

            
            	-fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \

            
            	-fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \

            
            	-fzero-call-used-regs=% -fno-stack-clash-protection \

            
            	-fno-inline-functions-called-once -fsanitize=bounds-strict \

            
            	-fstrict-flex-arrays=% \

            
            	--param=% --param asan-%


            # Derived from `scripts/Makefile.clang`.

            
            BINDGEN_TARGET_x86	:= x86_64-linux-gnu

            
            BINDGEN_TARGET		:= $(BINDGEN_TARGET_$(SRCARCH))


            # All warnings are inhibited since GCC builds are very experimental,

            
            # many GCC warnings are not supported by Clang, they may only appear in

            
            # some configurations, with new GCC versions, etc.

            
            bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)


            # Auto variable zero-initialization requires an additional special option with

            
            # clang that is going to be removed sometime in the future (likely in

            
            # clang-18), so make sure to pass this option only if clang supports it

            
            # (libclang major version < 16).

            
            #

            
            # https://github.com/llvm/llvm-project/issues/44842

            
            # https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags

            
            ifdef CONFIG_INIT_STACK_ALL_ZERO

            
            libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')

            
            ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)

            
            bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang

            
            endif

            
            endif


            bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \

            
            	$(bindgen_extra_c_flags)

            
            endif


            ifdef CONFIG_LTO

            
            bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))

            
            else

            
            bindgen_c_flags_lto = $(bindgen_c_flags)

            
            endif


            bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__


            quiet_cmd_bindgen = BINDGEN $@

            
                  cmd_bindgen = \

            
            	$(BINDGEN) $< $(bindgen_target_flags) \

            
            		--use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \

            
            		--no-debug '.*' \

            
            		-o $@ -- $(bindgen_c_flags_final) -DMODULE \

            
            		$(bindgen_target_cflags) $(bindgen_target_extra)


            $(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \

            
                $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)

            
            $(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \

            
                $(src)/bindgen_parameters FORCE

            
            	$(call if_changed_dep,bindgen)


            $(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \

            
                $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)

            
            $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \

            
                $(src)/bindgen_parameters FORCE

            
            	$(call if_changed_dep,bindgen)


            # See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn

            
            # with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here

            
            # given it is `libclang`; but for consistency, future Clang changes and/or

            
            # a potential future GCC backend for `bindgen`, we disable it too.

            
            $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \

            
                --blocklist-type '.*' --allowlist-var '' \

            
                --allowlist-function 'rust_helper_.*'

            
            $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \

            
                -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations

            
            $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \

            
                sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n    pub fn \1/g' $@

            
            $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE

            
            	$(call if_changed_dep,bindgen)


            quiet_cmd_exports = EXPORTS $@

            
                  cmd_exports = \

            
            	$(NM) -p --defined-only $< \

            
            		| awk '/ (T|R|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@


            $(obj)/exports_core_generated.h: $(obj)/core.o FORCE

            
            	$(call if_changed,exports)


            $(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE

            
            	$(call if_changed,exports)


            $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE

            
            	$(call if_changed,exports)


            $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE

            
            	$(call if_changed,exports)


            quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@

            
                  cmd_rustc_procmacro = \

            
            	$(RUSTC_OR_CLIPPY) $(rust_common_flags) \

            
            		-Clinker-flavor=gcc -Clinker=$(HOSTCC) \

            
            		-Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \

            
            		--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \

            
            		--crate-type proc-macro \

            
            		--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<


            # Procedural macros can only be used with the `rustc` that compiled it.

            
            # Therefore, to get `libmacros.so` automatically recompiled when the compiler

            
            # version changes, we add `core.o` as a dependency (even if it is not needed).

            
            $(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE

            
            	$(call if_changed_dep,rustc_procmacro)


            quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@

            
                  cmd_rustc_library = \

            
            	OBJTREE=$(abspath $(objtree)) \

            
            	$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \

            
            		$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \

            
            		--emit=dep-info=$(depfile) --emit=obj=$@ \

            
            		--emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \

            
            		--crate-type rlib -L$(objtree)/$(obj) \

            
            		--crate-name $(patsubst %.o,%,$(notdir $@)) $< \

            
            	$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)


            rust-analyzer:

            
            	$(Q)$(srctree)/scripts/generate_rust_analyzer.py \

            
            		--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \

            
            		$(abs_srctree) $(abs_objtree) \

            
            		$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \

            
            		$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json


            redirect-intrinsics = \

            
            	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \

            
            	__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \

            
            	__muloti4 __multi3 \

            
            	__udivmodti4 __udivti3 __umodti3


            ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)

            
            	# These intrinsics are defined for ARM64 and RISCV64

            
            	redirect-intrinsics += \

            
            		__ashrti3 \

            
            		__ashlti3 __lshrti3

            
            endif


            $(obj)/core.o: private skip_clippy = 1

            
            $(obj)/core.o: private skip_flags = -Dunreachable_pub

            
            $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))

            
            $(obj)/core.o: private rustc_target_flags = $(core-cfgs)

            
            $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'

            
            $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/alloc.o: private skip_clippy = 1

            
            $(obj)/alloc.o: private skip_flags = -Dunreachable_pub

            
            $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)

            
            $(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/bindings.o: $(src)/bindings/lib.rs \

            
                $(obj)/compiler_builtins.o \

            
                $(obj)/bindings/bindings_generated.rs \

            
                $(obj)/bindings/bindings_helpers_generated.rs FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/uapi.o: $(src)/uapi/lib.rs \

            
                $(obj)/compiler_builtins.o \

            
                $(obj)/uapi/uapi_generated.rs FORCE

            
            	$(call if_changed_dep,rustc_library)


            $(obj)/kernel.o: private rustc_target_flags = --extern alloc \

            
                --extern build_error --extern macros --extern bindings --extern uapi

            
            $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \

            
                $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE

            
            	$(call if_changed_dep,rustc_library)


            endif # CONFIG_RUST
	# SPDX-License-Identifier: GPL-2.0

	# Where to place rustdoc generated documentation
	rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc

	obj-$(CONFIG_RUST) += core.o compiler_builtins.o
	always-$(CONFIG_RUST) += exports_core_generated.h

	# Missing prototypes are expected in the helpers since these are exported
	# for Rust only, thus there is no header nor prototypes.
	obj-$(CONFIG_RUST) += helpers.o
	CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations

	always-$(CONFIG_RUST) += libmacros.so
	no-clean-files += libmacros.so

	always-$(CONFIG_RUST) += bindings/bindings_generated.rs bindings/bindings_helpers_generated.rs
	obj-$(CONFIG_RUST) += alloc.o bindings.o kernel.o
	always-$(CONFIG_RUST) += exports_alloc_generated.h exports_bindings_generated.h \
	exports_kernel_generated.h

	always-$(CONFIG_RUST) += uapi/uapi_generated.rs
	obj-$(CONFIG_RUST) += uapi.o

	ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
	obj-$(CONFIG_RUST) += build_error.o
	else
	always-$(CONFIG_RUST) += build_error.o
	endif

	obj-$(CONFIG_RUST) += exports.o

	always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
	always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c

	obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
	obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o

	# Avoids running `$(RUSTC)` for the sysroot when it may not be available.
	ifdef CONFIG_RUST

	# `$(rust_flags)` is passed in case the user added `--sysroot`.
	rustc_sysroot := $(shell $(RUSTC) $(rust_flags) --print sysroot)
	rustc_host_target := $(shell $(RUSTC) --version --verbose \| grep -F 'host: ' \| cut -d' ' -f2)
	RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library

	ifeq ($(quiet),silent_)
	cargo_quiet=-q
	rust_test_quiet=-q
	rustdoc_test_quiet=--test-args -q
	rustdoc_test_kernel_quiet=>/dev/null
	else ifeq ($(quiet),quiet_)
	rust_test_quiet=-q
	rustdoc_test_quiet=--test-args -q
	rustdoc_test_kernel_quiet=>/dev/null
	else
	cargo_quiet=--verbose
	endif

	core-cfgs = \
	--cfg no_fp_fmt_parse

	alloc-cfgs = \
	--cfg no_borrow \
	--cfg no_fmt \
	--cfg no_global_oom_handling \
	--cfg no_macros \
	--cfg no_rc \
	--cfg no_str \
	--cfg no_string \
	--cfg no_sync \
	--cfg no_thin

	quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
	cmd_rustdoc = \
	OBJTREE=$(abspath $(objtree)) \
	$(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
	$(rustc_target_flags) -L$(objtree)/$(obj) \
	--output $(rustdoc_output) \
	--crate-name $(subst rustdoc-,,$@) \
	@$(objtree)/include/generated/rustc_cfg $<

	# The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
	# can be used to specify a custom logo. However:
	# - The given value is used as-is, thus it cannot be relative or a local file
	# (unlike the non-custom case) since the generated docs have subfolders.
	# - It requires adding it to every crate.
	# - It requires changing `core` which comes from the sysroot.
	#
	# Using `-Zcrate-attr` would solve the last two points, but not the first.
	# The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
	# command-like flags to solve the issue. Meanwhile, we use the non-custom case
	# and then retouch the generated files.
	rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
	rustdoc-alloc rustdoc-kernel
	$(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
	$(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
	$(Q)find $(rustdoc_output) -name '*.html' -type f -print0 \| xargs -0 sed -Ei \
	-e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
	-e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
	-e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16\|32x32)-[0-9a-f]+\.png">::g'
	$(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
	echo ".logo-container > img { object-fit: contain; }" >> $$f; done

	rustdoc-macros: private rustdoc_host = yes
	rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
	--extern proc_macro
	rustdoc-macros: $(src)/macros/lib.rs FORCE
	$(call if_changed,rustdoc)

	rustdoc-core: private rustc_target_flags = $(core-cfgs)
	rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
	$(call if_changed,rustdoc)

	rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
	$(call if_changed,rustdoc)

	# We need to allow `rustdoc::broken_intra_doc_links` because some
	# `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
	# functions. Ideally `rustdoc` would have a way to distinguish broken links
	# due to things that are "configured out" vs. entirely non-existing ones.
	rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
	-Arustdoc::broken_intra_doc_links
	rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
	$(call if_changed,rustdoc)

	rustdoc-kernel: private rustc_target_flags = --extern alloc \
	--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
	--extern bindings --extern uapi
	rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
	rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
	$(obj)/bindings.o FORCE
	$(call if_changed,rustdoc)

	quiet_cmd_rustc_test_library = RUSTC TL $<
	cmd_rustc_test_library = \
	OBJTREE=$(abspath $(objtree)) \
	$(RUSTC) $(rust_common_flags) \
	@$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
	--crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
	--out-dir $(objtree)/$(obj)/test --cfg testlib \
	--sysroot $(objtree)/$(obj)/test/sysroot \
	-L$(objtree)/$(obj)/test \
	--crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<

	rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
	$(call if_changed,rustc_test_library)

	rusttestlib-macros: private rustc_target_flags = --extern proc_macro
	rusttestlib-macros: private rustc_test_library_proc = yes
	rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
	$(call if_changed,rustc_test_library)

	rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE
	$(call if_changed,rustc_test_library)

	rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE
	$(call if_changed,rustc_test_library)

	quiet_cmd_rustdoc_test = RUSTDOC T $<
	cmd_rustdoc_test = \
	OBJTREE=$(abspath $(objtree)) \
	$(RUSTDOC) --test $(rust_common_flags) \
	@$(objtree)/include/generated/rustc_cfg \
	$(rustc_target_flags) $(rustdoc_test_target_flags) \
	--sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
	-L$(objtree)/$(obj)/test --output $(rustdoc_output) \
	--crate-name $(subst rusttest-,,$@) $<

	quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
	cmd_rustdoc_test_kernel = \
	rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
	mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
	OBJTREE=$(abspath $(objtree)) \
	$(RUSTDOC) --test $(rust_flags) \
	@$(objtree)/include/generated/rustc_cfg \
	-L$(objtree)/$(obj) --extern alloc --extern kernel \
	--extern build_error --extern macros \
	--extern bindings --extern uapi \
	--no-run --crate-name kernel -Zunstable-options \
	--test-builder $(objtree)/scripts/rustdoc_test_builder \
	$< $(rustdoc_test_kernel_quiet); \
	$(objtree)/scripts/rustdoc_test_gen

	%/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
	$(src)/kernel/lib.rs $(obj)/kernel.o \
	$(objtree)/scripts/rustdoc_test_builder \
	$(objtree)/scripts/rustdoc_test_gen FORCE
	$(call if_changed,rustdoc_test_kernel)

	# We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
	# so for the moment we skip `-Cpanic=abort`.
	quiet_cmd_rustc_test = RUSTC T $<
	cmd_rustc_test = \
	OBJTREE=$(abspath $(objtree)) \
	$(RUSTC) --test $(rust_common_flags) \
	@$(objtree)/include/generated/rustc_cfg \
	$(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
	--sysroot $(objtree)/$(obj)/test/sysroot \
	-L$(objtree)/$(obj)/test \
	--crate-name $(subst rusttest-,,$@) $<; \
	$(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
	$(rustc_test_run_flags)

	rusttest: rusttest-macros rusttest-kernel

	# This prepares a custom sysroot with our custom `alloc` instead of
	# the standard one.
	#
	# This requires several hacks:
	# - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,
	# including third-party crates that need to be downloaded, plus custom
	# `build.rs` steps. Thus hardcoding things here is not maintainable.
	# - `cargo` knows how to build the standard library, but it is an unstable
	# feature so far (`-Zbuild-std`).
	# - `cargo` only considers the use case of building the standard library
	# to use it in a given package. Thus we need to create a dummy package
	# and pick the generated libraries from there.
	# - Since we only keep a subset of upstream `alloc` in-tree, we need
	# to recreate it on the fly by putting our sources on top.
	# - The usual ways of modifying the dependency graph in `cargo` do not seem
	# to apply for the `-Zbuild-std` steps, thus we have to mislead it
	# by modifying the sources in the sysroot.
	# - To avoid messing with the user's Rust installation, we create a clone
	# of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`
	# steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.
	#
	# In the future, we hope to avoid the whole ordeal by either:
	# - Making the `test` crate not depend on `std` (either improving upstream
	# or having our own custom crate).
	# - Making the tests run in kernel space (requires the previous point).
	# - Making `std` and friends be more like a "normal" crate, so that
	# `-Zbuild-std` and related hacks are not needed.
	quiet_cmd_rustsysroot = RUSTSYSROOT
	cmd_rustsysroot = \
	rm -rf $(objtree)/$(obj)/test; \
	mkdir -p $(objtree)/$(obj)/test; \
	cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \
	cp -r $(srctree)/$(src)/alloc/* \
	$(objtree)/$(obj)/test/sysroot/lib/rustlib/src/rust/library/alloc/src; \
	echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \
	echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \
	>> $(objtree)/$(obj)/test/rustc_sysroot; \
	chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \
	$(CARGO) -q new $(objtree)/$(obj)/test/dummy; \
	RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \
	test -Zbuild-std --target $(rustc_host_target) \
	--manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \
	rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \
	cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \
	$(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib

	rusttest-prepare: FORCE
	$(call if_changed,rustsysroot)

	rusttest-macros: private rustc_target_flags = --extern proc_macro
	rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
	rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
	$(call if_changed,rustc_test)
	$(call if_changed,rustdoc_test)

	rusttest-kernel: private rustc_target_flags = --extern alloc \
	--extern build_error --extern macros --extern bindings --extern uapi
	rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
	rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
	rusttestlib-uapi FORCE
	$(call if_changed,rustc_test)
	$(call if_changed,rustc_test_library)

	ifdef CONFIG_CC_IS_CLANG
	bindgen_c_flags = $(c_flags)
	else
	# bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
	# plugin backend and/or the Clang driver would be perfectly compatible with GCC.
	#
	# For the moment, here we are tweaking the flags on the fly. This is a hack,
	# and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
	# if we end up using one of those structs).
	bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
	-mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
	-mindirect-branch=thunk-extern -mindirect-branch-register \
	-mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
	-mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
	-mno-pointers-to-nested-functions -mno-string \
	-mno-strict-align -mstrict-align \
	-fconserve-stack -falign-jumps=% -falign-loops=% \
	-femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
	-fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
	-fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
	-fzero-call-used-regs=% -fno-stack-clash-protection \
	-fno-inline-functions-called-once -fsanitize=bounds-strict \
	-fstrict-flex-arrays=% \
	--param=% --param asan-%

	# Derived from `scripts/Makefile.clang`.
	BINDGEN_TARGET_x86 := x86_64-linux-gnu
	BINDGEN_TARGET := $(BINDGEN_TARGET_$(SRCARCH))

	# All warnings are inhibited since GCC builds are very experimental,
	# many GCC warnings are not supported by Clang, they may only appear in
	# some configurations, with new GCC versions, etc.
	bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)

	# Auto variable zero-initialization requires an additional special option with
	# clang that is going to be removed sometime in the future (likely in
	# clang-18), so make sure to pass this option only if clang supports it
	# (libclang major version < 16).
	#
	# https://github.com/llvm/llvm-project/issues/44842
	# https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
	ifdef CONFIG_INIT_STACK_ALL_ZERO
	libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 \| sed -ne 's/.clang version \([0-9]\).*/\1/p')
	ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
	bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
	endif
	endif

	bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
	$(bindgen_extra_c_flags)
	endif

	ifdef CONFIG_LTO
	bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
	else
	bindgen_c_flags_lto = $(bindgen_c_flags)
	endif

	bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__

	quiet_cmd_bindgen = BINDGEN $@
	cmd_bindgen = \
	$(BINDGEN) $< $(bindgen_target_flags) \
	--use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
	--no-debug '.*' \
	-o $@ -- $(bindgen_c_flags_final) -DMODULE \
	$(bindgen_target_cflags) $(bindgen_target_extra)

	$(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
	$(shell grep -Ev '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
	$(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
	$(src)/bindgen_parameters FORCE
	$(call if_changed_dep,bindgen)

	$(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
	$(shell grep -Ev '^#\|^$$' $(srctree)/$(src)/bindgen_parameters)
	$(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
	$(src)/bindgen_parameters FORCE
	$(call if_changed_dep,bindgen)

	# See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
	# with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
	# given it is `libclang`; but for consistency, future Clang changes and/or
	# a potential future GCC backend for `bindgen`, we disable it too.
	$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
	--blocklist-type '.*' --allowlist-var '' \
	--allowlist-function 'rust_helper_.*'
	$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
	-I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
	$(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
	sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n pub fn \1/g' $@
	$(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
	$(call if_changed_dep,bindgen)

	quiet_cmd_exports = EXPORTS $@
	cmd_exports = \
	$(NM) -p --defined-only $< \
	\| awk '/ (T\|R\|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@

	$(obj)/exports_core_generated.h: $(obj)/core.o FORCE
	$(call if_changed,exports)

	$(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
	$(call if_changed,exports)

	$(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
	$(call if_changed,exports)

	$(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
	$(call if_changed,exports)

	quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
	cmd_rustc_procmacro = \
	$(RUSTC_OR_CLIPPY) $(rust_common_flags) \
	-Clinker-flavor=gcc -Clinker=$(HOSTCC) \
	-Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \
	--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
	--crate-type proc-macro \
	--crate-name $(patsubst lib%.so,%,$(notdir $@)) $<

	# Procedural macros can only be used with the `rustc` that compiled it.
	# Therefore, to get `libmacros.so` automatically recompiled when the compiler
	# version changes, we add `core.o` as a dependency (even if it is not needed).
	$(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE
	$(call if_changed_dep,rustc_procmacro)

	quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
	cmd_rustc_library = \
	OBJTREE=$(abspath $(objtree)) \
	$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
	$(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
	--emit=dep-info=$(depfile) --emit=obj=$@ \
	--emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
	--crate-type rlib -L$(objtree)/$(obj) \
	--crate-name $(patsubst %.o,%,$(notdir $@)) $< \
	$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)

	rust-analyzer:
	$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
	--cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
	$(abs_srctree) $(abs_objtree) \
	$(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
	$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json

	redirect-intrinsics = \
	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
	__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
	__muloti4 __multi3 \
	__udivmodti4 __udivti3 __umodti3

	ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
	# These intrinsics are defined for ARM64 and RISCV64
	redirect-intrinsics += \
	__ashrti3 \
	__ashlti3 __lshrti3
	endif

	$(obj)/core.o: private skip_clippy = 1
	$(obj)/core.o: private skip_flags = -Dunreachable_pub
	$(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
	$(obj)/core.o: private rustc_target_flags = $(core-cfgs)
	$(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
	$(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/alloc.o: private skip_clippy = 1
	$(obj)/alloc.o: private skip_flags = -Dunreachable_pub
	$(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
	$(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/bindings.o: $(src)/bindings/lib.rs \
	$(obj)/compiler_builtins.o \
	$(obj)/bindings/bindings_generated.rs \
	$(obj)/bindings/bindings_helpers_generated.rs FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/uapi.o: $(src)/uapi/lib.rs \
	$(obj)/compiler_builtins.o \
	$(obj)/uapi/uapi_generated.rs FORCE
	$(call if_changed_dep,rustc_library)

	$(obj)/kernel.o: private rustc_target_flags = --extern alloc \
	--extern build_error --extern macros --extern bindings --extern uapi
	$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
	$(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
	$(call if_changed_dep,rustc_library)

	endif # CONFIG_RUST