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linux-stable/rust/Makefile
Miguel Ojeda 7a5f93ea58 rust: kbuild: set bindgen's Rust target version 
Each `bindgen` release may upgrade the list of Rust targets. For instance,
currently, in their master branch [1], the latest ones are:

    Nightly => {
        vectorcall_abi: #124485,
        ptr_metadata: #81513,
        layout_for_ptr: #69835,
    },
    Stable_1_77(77) => { offset_of: #106655 },
    Stable_1_73(73) => { thiscall_abi: #42202 },
    Stable_1_71(71) => { c_unwind_abi: #106075 },
    Stable_1_68(68) => { abi_efiapi: #105795 },

By default, the highest stable release in their list is used, and users
are expected to set one if they need to support older Rust versions
(e.g. see [2]).

Thus, over time, new Rust features are used by default, and at some
point, it is likely that `bindgen` will emit Rust code that requires a
Rust version higher than our minimum (or perhaps enabling an unstable
feature). Currently, there is no problem because the maximum they have,
as seen above, is Rust 1.77.0, and our current minimum is Rust 1.78.0.

Therefore, set a Rust target explicitly now to prevent going forward in
time too much and thus getting potential build failures at some point.

Since we also support a minimum `bindgen` version, and since `bindgen`
does not support passing unknown Rust target versions, we need to use
the list of our minimum `bindgen` version, rather than the latest. So,
since `bindgen` 0.65.1 had this list [3], we need to use Rust 1.68.0:

    /// Rust stable 1.64
    ///  * `core_ffi_c` ([Tracking issue](https://github.com/rust-lang/rust/issues/94501))
    => Stable_1_64 => 1.64;
    /// Rust stable 1.68
    ///  * `abi_efiapi` calling convention ([Tracking issue](https://github.com/rust-lang/rust/issues/65815))
    => Stable_1_68 => 1.68;
    /// Nightly rust
    ///  * `thiscall` calling convention ([Tracking issue](https://github.com/rust-lang/rust/issues/42202))
    ///  * `vectorcall` calling convention (no tracking issue)
    ///  * `c_unwind` calling convention ([Tracking issue](https://github.com/rust-lang/rust/issues/74990))
    => Nightly => nightly;

    ...

    /// Latest stable release of Rust
    pub const LATEST_STABLE_RUST: RustTarget = RustTarget::Stable_1_68;

Thus add the `--rust-target 1.68` parameter. Add a comment as well
explaining this.

An alternative would be to use the currently running (i.e. actual) `rustc`
and `bindgen` versions to pick a "better" Rust target version. However,
that would introduce more moving parts depending on the user setup and
is also more complex to implement.

Starting with `bindgen` 0.71.0 [4], we will be able to set any future
Rust version instead, i.e. we will be able to set here our minimum
supported Rust version. Christian implemented it [5] after seeing this
patch. Thanks!

Cc: Christian Poveda <git@pvdrz.com>
Cc: Emilio Cobos Álvarez <emilio@crisal.io>
Cc: stable@vger.kernel.org # needed for 6.12.y; unneeded for 6.6.y; do not apply to 6.1.y
Fixes: c844fa64a2 ("rust: start supporting several `bindgen` versions")
Link: 21c60f473f/bindgen/features.rs (L97-L105) [1]
Link: https://github.com/rust-lang/rust-bindgen/issues/2960 [2]
Link: 7d243056d3/bindgen/features.rs (L131-L150) [3]
Link: https://github.com/rust-lang/rust-bindgen/blob/main/CHANGELOG.md#0710-2024-12-06 [4]
Link: https://github.com/rust-lang/rust-bindgen/pull/2993 [5]
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20241123180323.255997-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2024-12-10 01:06:10 +01:00

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# 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 ffi.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/helpers.o
CFLAGS_REMOVE_helpers/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-$(CONFIG_RUST) += bindings.o kernel.o
always-$(CONFIG_RUST) += exports_helpers_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-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.o
always-$(subst y,$(CONFIG_RUST),$(CONFIG_JUMP_LABEL)) += kernel/generated_arch_static_branch_asm.rs
# 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 MAKEFLAGS= $(RUSTC) $(rust_flags) --print sysroot)
rustc_host_target := $(shell $(RUSTC) --version --verbose | grep -F 'host: ' | cut -d' ' -f2)
RUST_LIB_SRC ?= $(rustc_sysroot)/lib/rustlib/src/rust/library
ifneq ($(quiet),)
rust_test_quiet=-q
rustdoc_test_quiet=--test-args -q
rustdoc_test_kernel_quiet=>/dev/null
endif
core-cfgs = \
--cfg no_fp_fmt_parse
quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<
cmd_rustdoc = \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) $(filter-out $(skip_flags),$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \
$(rustc_target_flags) -L$(objtree)/$(obj) \
-Zunstable-options --generate-link-to-definition \
--output $(rustdoc_output) \
--crate-name $(subst rustdoc-,,$@) \
$(if $(rustdoc_host),,--sysroot=/dev/null) \
@$(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-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 $(rustdoc_output) -name '*.html' -type f -print0 | xargs -0 sed -Ei \
-e 's:rust-logo-[0-9a-f]+\.svg:logo.svg:g' \
-e 's:favicon-[0-9a-f]+\.svg:logo.svg:g' \
-e 's:<link rel="alternate icon" type="image/png" href="[/.]+/static\.files/favicon-(16x16|32x32)-[0-9a-f]+\.png">::g' \
-e 's:<a href="srctree/([^"]+)">:<a href="$(realpath $(srctree))/\1">: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)
# Starting with Rust 1.82.0, skipping `-Wrustdoc::unescaped_backticks` should
# not be needed -- see https://github.com/rust-lang/rust/pull/128307.
rustdoc-core: private skip_flags = -Wrustdoc::unescaped_backticks
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)
rustdoc-ffi: $(src)/ffi.rs rustdoc-core FORCE
+$(call if_changed,rustdoc)
rustdoc-kernel: private rustc_target_flags = --extern ffi \
--extern build_error --extern macros=$(objtree)/$(obj)/libmacros.so \
--extern bindings --extern uapi
rustdoc-kernel: $(src)/kernel/lib.rs rustdoc-core rustdoc-ffi rustdoc-macros \
rustdoc-compiler_builtins $(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 \
-L$(objtree)/$(obj)/test \
--crate-name $(subst rusttest-,,$(subst rusttestlib-,,$@)) $<
rusttestlib-build_error: $(src)/build_error.rs FORCE
+$(call if_changed,rustc_test_library)
rusttestlib-ffi: $(src)/ffi.rs FORCE
+$(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: $(src)/macros/lib.rs FORCE
+$(call if_changed,rustc_test_library)
rusttestlib-kernel: private rustc_target_flags = --extern ffi \
--extern build_error --extern macros \
--extern bindings --extern uapi
rusttestlib-kernel: $(src)/kernel/lib.rs \
rusttestlib-bindings rusttestlib-uapi rusttestlib-build_error \
$(obj)/libmacros.so $(obj)/bindings.o FORCE
+$(call if_changed,rustc_test_library)
rusttestlib-bindings: private rustc_target_flags = --extern ffi
rusttestlib-bindings: $(src)/bindings/lib.rs rusttestlib-ffi FORCE
+$(call if_changed,rustc_test_library)
rusttestlib-uapi: private rustc_target_flags = --extern ffi
rusttestlib-uapi: $(src)/uapi/lib.rs rusttestlib-ffi FORCE
+$(call if_changed,rustc_test_library)
quiet_cmd_rustdoc_test = RUSTDOC T $<
cmd_rustdoc_test = \
RUST_MODFILE=test.rs \
OBJTREE=$(abspath $(objtree)) \
$(RUSTDOC) --test $(rust_common_flags) \
@$(objtree)/include/generated/rustc_cfg \
$(rustc_target_flags) $(rustdoc_test_target_flags) \
$(rustdoc_test_quiet) \
-L$(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 $(rust_flags) \
-L$(objtree)/$(obj) --extern ffi --extern kernel \
--extern build_error --extern macros \
--extern bindings --extern uapi \
--no-run --crate-name kernel -Zunstable-options \
--sysroot=/dev/null \
--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 \
-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
rusttest-macros: private rustc_target_flags = --extern proc_macro \
--extern macros --extern kernel
rusttest-macros: private rustdoc_test_target_flags = --crate-type proc-macro
rusttest-macros: $(src)/macros/lib.rs \
rusttestlib-macros rusttestlib-kernel FORCE
+$(call if_changed,rustc_test)
+$(call if_changed,rustdoc_test)
rusttest-kernel: private rustc_target_flags = --extern ffi \
--extern build_error --extern macros --extern bindings --extern uapi
rusttest-kernel: $(src)/kernel/lib.rs rusttestlib-ffi rusttestlib-kernel \
rusttestlib-build_error rusttestlib-macros rusttestlib-bindings \
rusttestlib-uapi FORCE
+$(call if_changed,rustc_test)
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=% -fmin-function-alignment=% \
--param=% --param asan-%
# Derived from `scripts/Makefile.clang`.
BINDGEN_TARGET_x86 := x86_64-linux-gnu
BINDGEN_TARGET_arm64 := aarch64-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
# `-fno-builtin` is passed to avoid `bindgen` from using `clang` builtin
# prototypes for functions like `memcpy` -- if this flag is not passed,
# `bindgen`-generated prototypes use `c_ulong` or `c_uint` depending on
# architecture instead of generating `usize`.
bindgen_c_flags_final = $(bindgen_c_flags_lto) -fno-builtin -D__BINDGEN__
# Each `bindgen` release may upgrade the list of Rust target versions. By
# default, the highest stable release in their list is used. Thus we need to set
# a `--rust-target` to avoid future `bindgen` releases emitting code that
# `rustc` may not understand. On top of that, `bindgen` does not support passing
# an unknown Rust target version.
#
# Therefore, the Rust target for `bindgen` can be only as high as the minimum
# Rust version the kernel supports and only as high as the greatest stable Rust
# target supported by the minimum `bindgen` version the kernel supports (that
# is, if we do not test the actual `rustc`/`bindgen` versions running).
#
# Starting with `bindgen` 0.71.0, we will be able to set any future Rust version
# instead, i.e. we will be able to set here our minimum supported Rust version.
quiet_cmd_bindgen = BINDGEN $@
cmd_bindgen = \
$(BINDGEN) $< $(bindgen_target_flags) --rust-target 1.68 \
--use-core --with-derive-default --ctypes-prefix ffi --no-layout-tests \
--no-debug '.*' --enable-function-attribute-detection \
-o $@ -- $(bindgen_c_flags_final) -DMODULE \
$(bindgen_target_cflags) $(bindgen_target_extra)
$(obj)/bindings/bindings_generated.rs: private bindgen_target_flags = \
$(shell grep -Ev '^#|^$$' $(src)/bindgen_parameters)
$(obj)/bindings/bindings_generated.rs: private bindgen_target_extra = ; \
sed -Ei 's/pub const RUST_CONST_HELPER_([a-zA-Z0-9_]*)/pub const \1/g' $@
$(obj)/bindings/bindings_generated.rs: $(src)/bindings/bindings_helper.h \
$(src)/bindgen_parameters FORCE
$(call if_changed_dep,bindgen)
$(obj)/uapi/uapi_generated.rs: private bindgen_target_flags = \
$(shell grep -Ev '^#|^$$' $(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/helpers.c FORCE
$(call if_changed_dep,bindgen)
quiet_cmd_exports = EXPORTS $@
cmd_exports = \
$(NM) -p --defined-only $< \
| awk '$$2~/(T|R|D|B)/ && $$3!~/__cfi/ {printf "EXPORT_SYMBOL_RUST_GPL(%s);\n",$$3}' > $@
$(obj)/exports_core_generated.h: $(obj)/core.o FORCE
$(call if_changed,exports)
# Even though Rust kernel modules should never use the bindings directly,
# symbols from the `bindings` crate and the C helpers need to be exported
# because Rust generics and inlined functions may not get their code generated
# in the crate where they are defined. Other helpers, called from non-inline
# functions, may not be exported, in principle. However, in general, the Rust
# compiler does not guarantee codegen will be performed for a non-inline
# function either. Therefore, we export all symbols from helpers and bindings.
# In the future, this may be revisited to reduce the number of exports after
# the compiler is informed about the places codegen is required.
$(obj)/exports_helpers_generated.h: $(obj)/helpers/helpers.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.
$(obj)/libmacros.so: $(src)/macros/lib.rs FORCE
+$(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 $@)) $< \
--sysroot=/dev/null \
$(if $(rustc_objcopy),;$(OBJCOPY) $(rustc_objcopy) $@) \
$(cmd_objtool)
rust-analyzer:
$(Q)$(srctree)/scripts/generate_rust_analyzer.py \
--cfgs='core=$(core-cfgs)' \
$(realpath $(srctree)) $(realpath $(objtree)) \
$(rustc_sysroot) $(RUST_LIB_SRC) $(if $(KBUILD_EXTMOD),$(srcroot)) \
> rust-project.json
redirect-intrinsics = \
__addsf3 __eqsf2 __extendsfdf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __truncdfsf2 __unordsf2 \
__adddf3 __eqdf2 __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
define rule_rustc_library
$(call cmd_and_fixdep,rustc_library)
$(call cmd,gen_objtooldep)
endef
$(obj)/core.o: private skip_clippy = 1
$(obj)/core.o: private skip_flags = -Wunreachable_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 \
$(wildcard $(objtree)/include/config/RUSTC_VERSION_TEXT) FORCE
+$(call if_changed_rule,rustc_library)
ifneq ($(or $(CONFIG_X86_64),$(CONFIG_X86_32)),)
$(obj)/core.o: scripts/target.json
endif
$(obj)/compiler_builtins.o: private rustc_objcopy = -w -W '__*'
$(obj)/compiler_builtins.o: $(src)/compiler_builtins.rs $(obj)/core.o FORCE
+$(call if_changed_rule,rustc_library)
$(obj)/build_error.o: $(src)/build_error.rs $(obj)/compiler_builtins.o FORCE
+$(call if_changed_rule,rustc_library)
$(obj)/ffi.o: $(src)/ffi.rs $(obj)/compiler_builtins.o FORCE
+$(call if_changed_rule,rustc_library)
$(obj)/bindings.o: private rustc_target_flags = --extern ffi
$(obj)/bindings.o: $(src)/bindings/lib.rs \
$(obj)/ffi.o \
$(obj)/bindings/bindings_generated.rs \
$(obj)/bindings/bindings_helpers_generated.rs FORCE
+$(call if_changed_rule,rustc_library)
$(obj)/uapi.o: private rustc_target_flags = --extern ffi
$(obj)/uapi.o: $(src)/uapi/lib.rs \
$(obj)/ffi.o \
$(obj)/uapi/uapi_generated.rs FORCE
+$(call if_changed_rule,rustc_library)
$(obj)/kernel.o: private rustc_target_flags = --extern ffi \
--extern build_error --extern macros --extern bindings --extern uapi
$(obj)/kernel.o: $(src)/kernel/lib.rs $(obj)/build_error.o \
$(obj)/libmacros.so $(obj)/bindings.o $(obj)/uapi.o FORCE
+$(call if_changed_rule,rustc_library)
ifdef CONFIG_JUMP_LABEL
$(obj)/kernel.o: $(obj)/kernel/generated_arch_static_branch_asm.rs
endif
endif # CONFIG_RUST
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