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