rust/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 # Where to place rustdoc generated documentation
   4 rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc
   5
   6 obj-$(CONFIG_RUST) += core.o compiler_builtins.o
   7 always-$(CONFIG_RUST) += exports_core_generated.h
   8
   9 # Missing prototypes are expected in the helpers since these are exported
  10 # for Rust only, thus there is no header nor prototypes.
  11 obj-$(CONFIG_RUST) += helpers.o
  12 CFLAGS_REMOVE_helpers.o = -Wmissing-prototypes -Wmissing-declarations
  13
  14 always-$(CONFIG_RUST) += libmacros.so
  15 no-clean-files += libmacros.so
  16
  17 always-$(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
  21
  22 always-$(CONFIG_RUST) += uapi/uapi_generated.rs
  23 obj-$(CONFIG_RUST) += uapi.o
  24
  25 ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
  26 obj-$(CONFIG_RUST) += build_error.o
  27 else
  28 always-$(CONFIG_RUST) += build_error.o
  29 endif
  30
  31 obj-$(CONFIG_RUST) += exports.o
  32
  33 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs
  34 always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c
  35
  36 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.o
  37 obj-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
  38
  39 # Avoids running `$(RUSTC)` for the sysroot when it may not be available.
  40 ifdef CONFIG_RUST
  41
  42 # `$(rust_flags)` is passed in case the user added `--sysroot`.
  43 rustc_sysroot := $(shell $(RUSTC) $(rust_flags) --print sysroot)
  44 rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
  45 RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
  46
  47 ifeq ($(quiet),silent_)
  48 cargo_quiet=-q
  49 rust_test_quiet=-q
  50 rustdoc_test_quiet=--test-args -q
  51 rustdoc_test_kernel_quiet=>/dev/null
  52 else ifeq ($(quiet),quiet_)
  53 rust_test_quiet=-q
  54 rustdoc_test_quiet=--test-args -q
  55 rustdoc_test_kernel_quiet=>/dev/null
  56 else
  57 cargo_quiet=--verbose
  58 endif
  59
  60 core-cfgs = \
  61     --cfg no_fp_fmt_parse
  62
  63 alloc-cfgs = \
  64     --cfg no_borrow \
  65     --cfg no_fmt \
  66     --cfg no_global_oom_handling \
  67     --cfg no_macros \
  68     --cfg no_rc \
  69     --cfg no_str \
  70     --cfg no_string \
  71     --cfg no_sync \
  72     --cfg no_thin
  73
  74 quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
  75       cmd_rustdoc = \
  76         OBJTREE=$(abspath $(objtree)) \
  77         $(RUSTDOC) $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags)) \
  78                 $(rustc_target_flags) -L$(objtree)/$(obj) \
  79                 --output $(rustdoc_output) \
  80                 --crate-name $(subst rustdoc-,,$@) \
  81                 $(if $(rustdoc_host),,--sysroot=/dev/null) \
  82                 @$(objtree)/include/generated/rustc_cfg $<
  83
  84 # The `html_logo_url` and `html_favicon_url` forms of the `doc` attribute
  85 # can be used to specify a custom logo. However:
  86 #   - The given value is used as-is, thus it cannot be relative or a local file
  87 #     (unlike the non-custom case) since the generated docs have subfolders.
  88 #   - It requires adding it to every crate.
  89 #   - It requires changing `core` which comes from the sysroot.
  90 #
  91 # Using `-Zcrate-attr` would solve the last two points, but not the first.
  92 # The https://github.com/rust-lang/rfcs/pull/3226 RFC suggests two new
  93 # command-like flags to solve the issue. Meanwhile, we use the non-custom case
  94 # and then retouch the generated files.
  95 rustdoc: rustdoc-core rustdoc-macros rustdoc-compiler_builtins \
  96     rustdoc-alloc rustdoc-kernel
  97         $(Q)cp $(srctree)/Documentation/images/logo.svg $(rustdoc_output)/static.files/
  98         $(Q)cp $(srctree)/Documentation/images/COPYING-logo $(rustdoc_output)/static.files/
  99         $(Q)find $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
 100                 -e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
 101                 -e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
 102                 -e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
 103                 -e 's:<a href="srctree/([^"]+)">:<a href="$(abs_srctree)/\1">:g'
 104         $(Q)for f in $(rustdoc_output)/static.files/rustdoc-*.css; do \
 105                 echo ".logo-container > img { object-fit: contain; }" >> $$f; done
 106
 107 rustdoc-macros: private rustdoc_host = yes
 108 rustdoc-macros: private rustc_target_flags = --crate-type proc-macro \
 109     --extern proc_macro
 110 rustdoc-macros: $(src)/macros/lib.rs FORCE
 111         $(call if_changed,rustdoc)
 112
 113 rustdoc-core: private rustc_target_flags = $(core-cfgs)
 114 rustdoc-core: $(RUST_LIB_SRC)/core/src/lib.rs FORCE
 115         $(call if_changed,rustdoc)
 116
 117 rustdoc-compiler_builtins: $(src)/compiler_builtins.rs rustdoc-core FORCE
 118         $(call if_changed,rustdoc)
 119
 120 # We need to allow `rustdoc::broken_intra_doc_links` because some
 121 # `no_global_oom_handling` functions refer to non-`no_global_oom_handling`
 122 # functions. Ideally `rustdoc` would have a way to distinguish broken links
 123 # due to things that are "configured out" vs. entirely non-existing ones.
 124 rustdoc-alloc: private rustc_target_flags = $(alloc-cfgs) \
 125     -Arustdoc::broken_intra_doc_links
 126 rustdoc-alloc: $(src)/alloc/lib.rs rustdoc-core rustdoc-compiler_builtins FORCE
 127         $(call if_changed,rustdoc)
 128
 129 rustdoc-kernel: private rustc_target_flags = --extern alloc \
 130     --extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
 131     --extern bindings --extern uapi
 132 rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-macros \
 133     rustdoc-compiler_builtins rustdoc-alloc $(obj)/libmacros.so \
 134     $(obj)/bindings.o FORCE
 135         $(call if_changed,rustdoc)
 136
 137 quiet_cmd_rustc_test_library = RUSTC TL $<
 138       cmd_rustc_test_library = \
 139         OBJTREE=$(abspath $(objtree)) \
 140         $(RUSTC) $(rust_common_flags) \
 141                 @$(objtree)/include/generated/rustc_cfg $(rustc_target_flags) \
 142                 --crate-type $(if $(rustc_test_library_proc),proc-macro,rlib) \
 143                 --out-dir $(objtree)/$(obj)/test --cfg testlib \
 144                 --sysroot $(objtree)/$(obj)/test/sysroot \
 145                 -L$(objtree)/$(obj)/test \
 146                 --crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
 147
 148 rusttestlib-build_error: $(src)/build_error.rs rusttest-prepare FORCE
 149         $(call if_changed,rustc_test_library)
 150
 151 rusttestlib-macros: private rustc_target_flags = --extern proc_macro
 152 rusttestlib-macros: private rustc_test_library_proc = yes
 153 rusttestlib-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
 154         $(call if_changed,rustc_test_library)
 155
 156 rusttestlib-bindings: $(src)/bindings/lib.rs rusttest-prepare FORCE
 157         $(call if_changed,rustc_test_library)
 158
 159 rusttestlib-uapi: $(src)/uapi/lib.rs rusttest-prepare FORCE
 160         $(call if_changed,rustc_test_library)
 161
 162 quiet_cmd_rustdoc_test = RUSTDOC T $<
 163       cmd_rustdoc_test = \
 164         OBJTREE=$(abspath $(objtree)) \
 165         $(RUSTDOC) --test $(rust_common_flags) \
 166                 @$(objtree)/include/generated/rustc_cfg \
 167                 $(rustc_target_flags) $(rustdoc_test_target_flags) \
 168                 --sysroot $(objtree)/$(obj)/test/sysroot $(rustdoc_test_quiet) \
 169                 -L$(objtree)/$(obj)/test --output $(rustdoc_output) \
 170                 --crate-name $(subst rusttest-,,$@) $<
 171
 172 quiet_cmd_rustdoc_test_kernel = RUSTDOC TK $<
 173       cmd_rustdoc_test_kernel = \
 174         rm -rf $(objtree)/$(obj)/test/doctests/kernel; \
 175         mkdir -p $(objtree)/$(obj)/test/doctests/kernel; \
 176         OBJTREE=$(abspath $(objtree)) \
 177         $(RUSTDOC) --test $(rust_flags) \
 178                 -L$(objtree)/$(obj) --extern alloc --extern kernel \
 179                 --extern build_error --extern macros \
 180                 --extern bindings --extern uapi \
 181                 --no-run --crate-name kernel -Zunstable-options \
 182                 --sysroot=/dev/null \
 183                 --test-builder $(objtree)/scripts/rustdoc_test_builder \
 184                 $< $(rustdoc_test_kernel_quiet); \
 185         $(objtree)/scripts/rustdoc_test_gen
 186
 187 %/doctests_kernel_generated.rs %/doctests_kernel_generated_kunit.c: \
 188     $(src)/kernel/lib.rs $(obj)/kernel.o \
 189     $(objtree)/scripts/rustdoc_test_builder \
 190     $(objtree)/scripts/rustdoc_test_gen FORCE
 191         $(call if_changed,rustdoc_test_kernel)
 192
 193 # We cannot use `-Zpanic-abort-tests` because some tests are dynamic,
 194 # so for the moment we skip `-Cpanic=abort`.
 195 quiet_cmd_rustc_test = RUSTC T  $<
 196       cmd_rustc_test = \
 197         OBJTREE=$(abspath $(objtree)) \
 198         $(RUSTC) --test $(rust_common_flags) \
 199                 @$(objtree)/include/generated/rustc_cfg \
 200                 $(rustc_target_flags) --out-dir $(objtree)/$(obj)/test \
 201                 --sysroot $(objtree)/$(obj)/test/sysroot \
 202                 -L$(objtree)/$(obj)/test \
 203                 --crate-name $(subst rusttest-,,$@) $<; \
 204         $(objtree)/$(obj)/test/$(subst rusttest-,,$@) $(rust_test_quiet) \
 205                 $(rustc_test_run_flags)
 206
 207 rusttest: rusttest-macros rusttest-kernel
 208
 209 # This prepares a custom sysroot with our custom `alloc` instead of
 210 # the standard one.
 211 #
 212 # This requires several hacks:
 213 #   - Unlike `core` and `alloc`, `std` depends on more than a dozen crates,
 214 #     including third-party crates that need to be downloaded, plus custom
 215 #     `build.rs` steps. Thus hardcoding things here is not maintainable.
 216 #   - `cargo` knows how to build the standard library, but it is an unstable
 217 #     feature so far (`-Zbuild-std`).
 218 #   - `cargo` only considers the use case of building the standard library
 219 #     to use it in a given package. Thus we need to create a dummy package
 220 #     and pick the generated libraries from there.
 221 #   - Since we only keep a subset of upstream `alloc` in-tree, we need
 222 #     to recreate it on the fly by putting our sources on top.
 223 #   - The usual ways of modifying the dependency graph in `cargo` do not seem
 224 #     to apply for the `-Zbuild-std` steps, thus we have to mislead it
 225 #     by modifying the sources in the sysroot.
 226 #   - To avoid messing with the user's Rust installation, we create a clone
 227 #     of the sysroot. However, `cargo` ignores `RUSTFLAGS` in the `-Zbuild-std`
 228 #     steps, thus we use a wrapper binary passed via `RUSTC` to pass the flag.
 229 #
 230 # In the future, we hope to avoid the whole ordeal by either:
 231 #   - Making the `test` crate not depend on `std` (either improving upstream
 232 #     or having our own custom crate).
 233 #   - Making the tests run in kernel space (requires the previous point).
 234 #   - Making `std` and friends be more like a "normal" crate, so that
 235 #     `-Zbuild-std` and related hacks are not needed.
 236 quiet_cmd_rustsysroot = RUSTSYSROOT
 237       cmd_rustsysroot = \
 238         rm -rf $(objtree)/$(obj)/test; \
 239         mkdir -p $(objtree)/$(obj)/test; \
 240         cp -a $(rustc_sysroot) $(objtree)/$(obj)/test/sysroot; \
 241         cp -r $(srctree)/$(src)/alloc/* \
 242                 $(objtree)/$(obj)/test/sysroot/lib/rustlib/src/rust/library/alloc/src; \
 243         echo '\#!/bin/sh' > $(objtree)/$(obj)/test/rustc_sysroot; \
 244         echo "$(RUSTC) --sysroot=$(abspath $(objtree)/$(obj)/test/sysroot) \"\$$@\"" \
 245                 >> $(objtree)/$(obj)/test/rustc_sysroot; \
 246         chmod u+x $(objtree)/$(obj)/test/rustc_sysroot; \
 247         $(CARGO) -q new $(objtree)/$(obj)/test/dummy; \
 248         RUSTC=$(objtree)/$(obj)/test/rustc_sysroot $(CARGO) $(cargo_quiet) \
 249                 test -Zbuild-std --target $(rustc_host_target) \
 250                 --manifest-path $(objtree)/$(obj)/test/dummy/Cargo.toml; \
 251         rm $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib/*; \
 252         cp $(objtree)/$(obj)/test/dummy/target/$(rustc_host_target)/debug/deps/* \
 253                 $(objtree)/$(obj)/test/sysroot/lib/rustlib/$(rustc_host_target)/lib
 254
 255 rusttest-prepare: FORCE
 256         $(call if_changed,rustsysroot)
 257
 258 rusttest-macros: private rustc_target_flags = --extern proc_macro
 259 rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
 260 rusttest-macros: $(src)/macros/lib.rs rusttest-prepare FORCE
 261         $(call if_changed,rustc_test)
 262         $(call if_changed,rustdoc_test)
 263
 264 rusttest-kernel: private rustc_target_flags = --extern alloc \
 265     --extern build_error --extern macros --extern bindings --extern uapi
 266 rusttest-kernel: $(src)/kernel/lib.rs rusttest-prepare \
 267     rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
 268     rusttestlib-uapi FORCE
 269         $(call if_changed,rustc_test)
 270         $(call if_changed,rustc_test_library)
 271
 272 ifdef CONFIG_CC_IS_CLANG
 273 bindgen_c_flags = $(c_flags)
 274 else
 275 # bindgen relies on libclang to parse C. Ideally, bindgen would support a GCC
 276 # plugin backend and/or the Clang driver would be perfectly compatible with GCC.
 277 #
 278 # For the moment, here we are tweaking the flags on the fly. This is a hack,
 279 # and some kernel configurations may not work (e.g. `GCC_PLUGIN_RANDSTRUCT`
 280 # if we end up using one of those structs).
 281 bindgen_skip_c_flags := -mno-fp-ret-in-387 -mpreferred-stack-boundary=% \
 282         -mskip-rax-setup -mgeneral-regs-only -msign-return-address=% \
 283         -mindirect-branch=thunk-extern -mindirect-branch-register \
 284         -mfunction-return=thunk-extern -mrecord-mcount -mabi=lp64 \
 285         -mindirect-branch-cs-prefix -mstack-protector-guard% -mtraceback=no \
 286         -mno-pointers-to-nested-functions -mno-string \
 287         -mno-strict-align -mstrict-align \
 288         -fconserve-stack -falign-jumps=% -falign-loops=% \
 289         -femit-struct-debug-baseonly -fno-ipa-cp-clone -fno-ipa-sra \
 290         -fno-partial-inlining -fplugin-arg-arm_ssp_per_task_plugin-% \
 291         -fno-reorder-blocks -fno-allow-store-data-races -fasan-shadow-offset=% \
 292         -fzero-call-used-regs=% -fno-stack-clash-protection \
 293         -fno-inline-functions-called-once -fsanitize=bounds-strict \
 294         -fstrict-flex-arrays=% \
 295         --param=% --param asan-%
 296
 297 # Derived from `scripts/Makefile.clang`.
 298 BINDGEN_TARGET_x86      := x86_64-linux-gnu
 299 BINDGEN_TARGET          := $(BINDGEN_TARGET_$(SRCARCH))
 300
 301 # All warnings are inhibited since GCC builds are very experimental,
 302 # many GCC warnings are not supported by Clang, they may only appear in
 303 # some configurations, with new GCC versions, etc.
 304 bindgen_extra_c_flags = -w --target=$(BINDGEN_TARGET)
 305
 306 # Auto variable zero-initialization requires an additional special option with
 307 # clang that is going to be removed sometime in the future (likely in
 308 # clang-18), so make sure to pass this option only if clang supports it
 309 # (libclang major version < 16).
 310 #
 311 # https://github.com/llvm/llvm-project/issues/44842
 312 # https://github.com/llvm/llvm-project/blob/llvmorg-16.0.0-rc2/clang/docs/ReleaseNotes.rst#deprecated-compiler-flags
 313 ifdef CONFIG_INIT_STACK_ALL_ZERO
 314 libclang_maj_ver=$(shell $(BINDGEN) $(srctree)/scripts/rust_is_available_bindgen_libclang.h 2>&1 | sed -ne 's/.*clang version \([0-9]*\).*/\1/p')
 315 ifeq ($(shell expr $(libclang_maj_ver) \< 16), 1)
 316 bindgen_extra_c_flags += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
 317 endif
 318 endif
 319
 320 bindgen_c_flags = $(filter-out $(bindgen_skip_c_flags), $(c_flags)) \
 321         $(bindgen_extra_c_flags)
 322 endif
 323
 324 ifdef CONFIG_LTO
 325 bindgen_c_flags_lto = $(filter-out $(CC_FLAGS_LTO), $(bindgen_c_flags))
 326 else
 327 bindgen_c_flags_lto = $(bindgen_c_flags)
 328 endif
 329
 330 bindgen_c_flags_final = $(bindgen_c_flags_lto) -D__BINDGEN__
 331
 332 quiet_cmd_bindgen = BINDGEN $@
 333       cmd_bindgen = \
 334         $(BINDGEN) $< $(bindgen_target_flags) \
 335                 --use-core --with-derive-default --ctypes-prefix core::ffi --no-layout-tests \
 336                 --no-debug '.*' \
 337                 -o $@ -- $(bindgen_c_flags_final) -DMODULE \
 338                 $(bindgen_target_cflags) $(bindgen_target_extra)
 339
 340 $(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
 341     $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)
 342 $(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \
 343     sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@
 344 $(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
 345     $(src)/bindgen_parameters FORCE
 346         $(call if_changed_dep,bindgen)
 347
 348 $(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
 349     $(shell grep -Ev '^#|^$$' $(srctree)/$(src)/bindgen_parameters)
 350 $(obj)/uapi/uapi_generated.rs: $(src)/uapi/uapi_helper.h \
 351     $(src)/bindgen_parameters FORCE
 352         $(call if_changed_dep,bindgen)
 353
 354 # See `CFLAGS_REMOVE_helpers.o` above. In addition, Clang on C does not warn
 355 # with `-Wmissing-declarations` (unlike GCC), so it is not strictly needed here
 356 # given it is `libclang`; but for consistency, future Clang changes and/or
 357 # a potential future GCC backend for `bindgen`, we disable it too.
 358 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_flags = \
 359     --blocklist-type '.*' --allowlist-var '' \
 360     --allowlist-function 'rust_helper_.*'
 361 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_cflags = \
 362     -I$(objtree)/$(obj) -Wno-missing-prototypes -Wno-missing-declarations
 363 $(obj)/bindings/bindings_helpers_generated.rs: private bindgen_target_extra = ; \
 364     sed -Ei 's/pub fn rust_helper_([a-zA-Z0-9_]*)/#[link_name="rust_helper_\1"]\n    pub fn \1/g' $@
 365 $(obj)/bindings/bindings_helpers_generated.rs: $(src)/helpers.c FORCE
 366         $(call if_changed_dep,bindgen)
 367
 368 quiet_cmd_exports = EXPORTS $@
 369       cmd_exports = \
 370         $(NM) -p --defined-only $< \
 371                 | awk '/ (T|R|D) / {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
 372
 373 $(obj)/exports_core_generated.h: $(obj)/core.o FORCE
 374         $(call if_changed,exports)
 375
 376 $(obj)/exports_alloc_generated.h: $(obj)/alloc.o FORCE
 377         $(call if_changed,exports)
 378
 379 $(obj)/exports_bindings_generated.h: $(obj)/bindings.o FORCE
 380         $(call if_changed,exports)
 381
 382 $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE
 383         $(call if_changed,exports)
 384
 385 quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@
 386       cmd_rustc_procmacro = \
 387         $(RUSTC_OR_CLIPPY) $(rust_common_flags) \
 388                 -Clinker-flavor=gcc -Clinker=$(HOSTCC) \
 389                 -Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \
 390                 --emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \
 391                 --crate-type proc-macro \
 392                 --crate-name $(patsubst lib%.so,%,$(notdir $@)) $<
 393
 394 # Procedural macros can only be used with the `rustc` that compiled it.
 395 # Therefore, to get `libmacros.so` automatically recompiled when the compiler
 396 # version changes, we add `core.o` as a dependency (even if it is not needed).
 397 $(obj)/libmacros.so: $(src)/macros/lib.rs $(obj)/core.o FORCE
 398         $(call if_changed_dep,rustc_procmacro)
 399
 400 quiet_cmd_rustc_library = $(if $(skip_clippy),RUSTC,$(RUSTC_OR_CLIPPY_QUIET)) L $@
 401       cmd_rustc_library = \
 402         OBJTREE=$(abspath $(objtree)) \
 403         $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \
 404                 $(filter-out $(skip_flags),$(rust_flags) $(rustc_target_flags)) \
 405                 --emit=dep-info=$(depfile) --emit=obj=$@ \
 406                 --emit=metadata=$(dir $@)$(patsubst %.o,lib%.rmeta,$(notdir $@)) \
 407                 --crate-type rlib -L$(objtree)/$(obj) \
 408                 --crate-name $(patsubst %.o,%,$(notdir $@)) $< \
 409                 --sysroot=/dev/null \
 410         $(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@)
 411
 412 rust-analyzer:
 413         $(Q)$(srctree)/scripts/generate_rust_analyzer.py \
 414                 --cfgs='core=$(core-cfgs)' --cfgs='alloc=$(alloc-cfgs)' \
 415                 $(abs_srctree) $(abs_objtree) \
 416                 $(RUST_LIB_SRC) $(KBUILD_EXTMOD) > \
 417                 $(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json
 418
 419 redirect-intrinsics = \
 420         __addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \
 421         __adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \
 422         __muloti4 __multi3 \
 423         __udivmodti4 __udivti3 __umodti3
 424
 425 ifneq ($(or $(CONFIG_ARM64),$(and $(CONFIG_RISCV),$(CONFIG_64BIT))),)
 426         # These intrinsics are defined for ARM64 and RISCV64
 427         redirect-intrinsics += \
 428                 __ashrti3 \
 429                 __ashlti3 __lshrti3
 430 endif
 431
 432 $(obj)/core.o: private skip_clippy = 1
 433 $(obj)/core.o: private skip_flags = -Dunreachable_pub
 434 $(obj)/core.o: private rustc_objcopy = $(foreach sym,$(redirect-intrinsics),--redefine-sym $(sym)=__rust$(sym))
 435 $(obj)/core.o: private rustc_target_flags = $(core-cfgs)
 436 $(obj)/core.o: $(RUST_LIB_SRC)/core/src/lib.rs scripts/target.json FORCE
 437         $(call if_changed_dep,rustc_library)
 438
 439 $(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
 440 $(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
 441         $(call if_changed_dep,rustc_library)
 442
 443 $(obj)/alloc.o: private skip_clippy = 1
 444 $(obj)/alloc.o: private skip_flags = -Dunreachable_pub
 445 $(obj)/alloc.o: private rustc_target_flags = $(alloc-cfgs)
 446 $(obj)/alloc.o: $(src)/alloc/lib.rs $(obj)/compiler_builtins.o FORCE
 447         $(call if_changed_dep,rustc_library)
 448
 449 $(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
 450         $(call if_changed_dep,rustc_library)
 451
 452 $(obj)/bindings.o: $(src)/bindings/lib.rs \
 453     $(obj)/compiler_builtins.o \
 454     $(obj)/bindings/bindings_generated.rs \
 455     $(obj)/bindings/bindings_helpers_generated.rs FORCE
 456         $(call if_changed_dep,rustc_library)
 457
 458 $(obj)/uapi.o: $(src)/uapi/lib.rs \
 459     $(obj)/compiler_builtins.o \
 460     $(obj)/uapi/uapi_generated.rs FORCE
 461         $(call if_changed_dep,rustc_library)
 462
 463 $(obj)/kernel.o: private rustc_target_flags = --extern alloc \
 464     --extern build_error --extern macros --extern bindings --extern uapi
 465 $(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/alloc.o $(obj)/build_error.o \
 466     $(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
 467         $(call if_changed_dep,rustc_library)
 468
 469 endif # CONFIG_RUST