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The host's standard library from the rustup toolchain > 2. The kernel's custom libcore.rmeta in the rust/ directory > > This occurred because the build system was using `-L$(objtree)/rust` > for host library builds (proc_macro2, quote, syn), which caused rustc > to search the rust/ directory. During this search, rustc would find > both the kernel's custom libcore.rmeta and gain access to the host's > standard library, creating a conflict. > > The solution is to separate host libraries into a dedicated rust/host/ > subdirectory and use `-L$(objtree)/rust/host` for host builds instead > of `-L$(objtree)/rust`. This ensures that: > > 1. Host library builds (proc_macro2, quote, syn) only search rust/host/ > and never encounter the kernel's libcore.rmeta > 2. Proc macro builds use `-L$(objtree)/rust/host` to find their > dependencies > 3. Test builds use `-L$(objtree)/rust/test` for their dependencies > 4. Target builds continue to use `-L$(objtree)/rust` as before > > Special handling is added for rustdoc-pin_init, which is a host build > (to access the alloc crate) but depends on proc macros from the main > rust/ directory. It uses explicit `--extern` paths with absolute paths > to reference the proc macros without adding `-L$(objtree)/rust`, which > would reintroduce the conflict. > > The rust/host/ directory is added to clean-files to ensure it's removed > during `make clean`. > > Changes: > - Add clean-files :=3D host/ to clean the generated directory > - Change host library targets from lib*.rlib to host/lib*.rlib > - Update cmd_rustc_procmacrolibrary to create host/ directory > - Update cmd_rustc_procmacro to use -L$(objtree)/rust/host > - Update cmd_rustdoc to use -L$(objtree)/rust/host for host builds > - Update cmd_rustc_test_library to use -L$(objtree)/rust/test > - Update rustdoc-pin_init to use explicit --extern paths for proc macros This should go after the tags and ---, so it's not part of the commit messa= ge. > > Link: https://github.com/Rust-for-Linux/linux/issues/105 > Link: https://github.com/linuxppc/issues/issues/451 > Signed-off-by: Mukesh Kumar Chaurasiya (IBM) > --- > rust/Makefile | 63 ++++++++++++++++++++++++++++++++------------------- > 1 file changed, 40 insertions(+), 23 deletions(-) > > diff --git a/rust/Makefile b/rust/Makefile > index 9801af2e1e02..762bddc868e4 100644 > --- a/rust/Makefile > +++ b/rust/Makefile > @@ -3,6 +3,9 @@ > # Where to place rustdoc generated documentation > rustdoc_output :=3D $(objtree)/Documentation/output/rust/rustdoc > =20 > +# Clean generated host directory > +clean-files :=3D host/ > + > obj-$(CONFIG_RUST) +=3D core.o compiler_builtins.o ffi.o > always-$(CONFIG_RUST) +=3D exports_core_generated.h > =20 > @@ -27,7 +30,7 @@ endif > =20 > obj-$(CONFIG_RUST) +=3D exports.o > =20 > -always-$(CONFIG_RUST) +=3D libproc_macro2.rlib libquote.rlib libsyn.rlib > +always-$(CONFIG_RUST) +=3D host/libproc_macro2.rlib host/libquote.rlib h= ost/libsyn.rlib > =20 > always-$(CONFIG_RUST_KERNEL_DOCTESTS) +=3D doctests_kernel_generated.rs > always-$(CONFIG_RUST_KERNEL_DOCTESTS) +=3D doctests_kernel_generated_kun= it.c > @@ -150,7 +153,7 @@ quiet_cmd_rustdoc =3D RUSTDOC $(if $(rustdoc_host),H,= ) $< > OBJTREE=3D$(abspath $(objtree)) \ > $(RUSTDOC) $(filter-out $(skip_flags) --remap-path-prefix=3D% --remap-p= ath-scope=3D%, \ > $(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \ > - $(rustc_target_flags) -L$(objtree)/$(obj) \ > + $(rustc_target_flags) -L$(objtree)/$(obj)$(if $(rustdoc_host),/host) \ > -Zunstable-options --generate-link-to-definition \ > --output $(rustdoc_output) \ > --crate-name $(subst rustdoc-,,$@) \ > @@ -193,13 +196,16 @@ rustdoc-proc_macro2: $(src)/proc-macro2/lib.rs rust= doc-clean FORCE > +$(call if_changed,rustdoc) > =20 > rustdoc-quote: private rustdoc_host =3D yes > -rustdoc-quote: private rustc_target_flags =3D $(quote-flags) > +rustdoc-quote: private rustc_target_flags =3D $(quote-flags) \ > + --extern proc_macro2=3D$(abspath $(objtree)/$(obj)/host/libproc_macr= o2.rlib) Why not just add `-L$(objtree)/$(obj)/host`? If we go with the host directo= ry approach we shouldn't need to explicitly specify the path? Best, Gary > rustdoc-quote: private skip_flags =3D $(quote-skip_flags) > rustdoc-quote: $(src)/quote/lib.rs rustdoc-clean rustdoc-proc_macro2 FOR= CE > +$(call if_changed,rustdoc) > =20 > rustdoc-syn: private rustdoc_host =3D yes > -rustdoc-syn: private rustc_target_flags =3D $(syn-flags) > +rustdoc-syn: private rustc_target_flags =3D $(syn-flags) \ > + --extern proc_macro2=3D$(abspath $(objtree)/$(obj)/host/libproc_macr= o2.rlib) \ > + --extern quote=3D$(abspath $(objtree)/$(obj)/host/libquote.rlib) > rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE > +$(call if_changed,rustdoc) > =20 > @@ -236,7 +242,10 @@ rustdoc-pin_init_internal: $(src)/pin-init/internal/= src/lib.rs \ > +$(call if_changed,rustdoc) > =20 > rustdoc-pin_init: private rustdoc_host =3D yes > -rustdoc-pin_init: private rustc_target_flags =3D $(pin_init-flags) \ > +rustdoc-pin_init: private rustc_target_flags =3D \ > + --extern pin_init_internal=3D$(abspath $(objtree)/$(obj)/$(libpin_in= it_internal_name)) \ > + --extern macros=3D$(abspath $(objtree)/$(obj)/$(libmacros_name)) \ > + $(call cfgs-to-flags,$(pin_init-cfgs)) \ > --extern alloc --cfg feature=3D\"alloc\" > rustdoc-pin_init: $(src)/pin-init/src/lib.rs rustdoc-pin_init_internal \ > rustdoc-macros FORCE > @@ -369,7 +378,9 @@ rusttest: rusttest-macros > =20 > rusttest-macros: private rustc_target_flags =3D --extern proc_macro \ > --extern macros --extern kernel --extern pin_init \ > - --extern proc_macro2 --extern quote --extern syn > + --extern proc_macro2=3D$(abspath $(objtree)/$(obj)/test/libproc_macr= o2.rlib) \ > + --extern quote=3D$(abspath $(objtree)/$(obj)/test/libquote.rlib) \ > + --extern syn=3D$(abspath $(objtree)/$(obj)/test/libsyn.rlib) > rusttest-macros: private rustdoc_test_target_flags =3D --crate-type proc= -macro > rusttest-macros: $(src)/macros/lib.rs \ > rusttestlib-macros rusttestlib-kernel rusttestlib-pin_init FORCE > @@ -525,48 +536,54 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o = FORCE > =20 > quiet_cmd_rustc_procmacrolibrary =3D $(RUSTC_OR_CLIPPY_QUIET) PL $@ > cmd_rustc_procmacrolibrary =3D \ > + mkdir -p $(dir $@); \ > $(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \ > $(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags))= \ > --emit=3Ddep-info=3D$(depfile) --emit=3Dlink=3D$@ --crate-type rlib -O= \ > - --out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \ > --crate-name $(patsubst lib%.rlib,%,$(notdir $@)) $< > =20 > -$(obj)/libproc_macro2.rlib: private skip_clippy =3D 1 > -$(obj)/libproc_macro2.rlib: private rustc_target_flags =3D $(proc_macro2= -flags) > -$(obj)/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE > +$(obj)/host/libproc_macro2.rlib: private skip_clippy =3D 1 > +$(obj)/host/libproc_macro2.rlib: private rustc_target_flags =3D $(proc_m= acro2-flags) > +$(obj)/host/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE > +$(call if_changed_dep,rustc_procmacrolibrary) > =20 > -$(obj)/libquote.rlib: private skip_clippy =3D 1 > -$(obj)/libquote.rlib: private skip_flags =3D $(quote-skip_flags) > -$(obj)/libquote.rlib: private rustc_target_flags =3D $(quote-flags) > -$(obj)/libquote.rlib: $(src)/quote/lib.rs $(obj)/libproc_macro2.rlib FOR= CE > +$(obj)/host/libquote.rlib: private skip_clippy =3D 1 > +$(obj)/host/libquote.rlib: private skip_flags =3D $(quote-skip_flags) > +$(obj)/host/libquote.rlib: private rustc_target_flags =3D $(quote-flags)= \ > + --extern proc_macro2=3D$(abspath $(objtree)/$(obj)/host/libproc_macro2.= rlib) > +$(obj)/host/libquote.rlib: $(src)/quote/lib.rs $(obj)/host/libproc_macro= 2.rlib FORCE > +$(call if_changed_dep,rustc_procmacrolibrary) > =20 > -$(obj)/libsyn.rlib: private skip_clippy =3D 1 > -$(obj)/libsyn.rlib: private rustc_target_flags =3D $(syn-flags) > -$(obj)/libsyn.rlib: $(src)/syn/lib.rs $(obj)/libquote.rlib FORCE > +$(obj)/host/libsyn.rlib: private skip_clippy =3D 1 > +$(obj)/host/libsyn.rlib: private rustc_target_flags =3D $(syn-flags) \ > + --extern proc_macro2=3D$(abspath $(objtree)/$(obj)/host/libproc_macro2.= rlib) \ > + --extern quote=3D$(abspath $(objtree)/$(obj)/host/libquote.rlib) > +$(obj)/host/libsyn.rlib: $(src)/syn/lib.rs $(obj)/host/libquote.rlib FOR= CE > +$(call if_changed_dep,rustc_procmacrolibrary) > =20 > quiet_cmd_rustc_procmacro =3D $(RUSTC_OR_CLIPPY_QUIET) P $@ > cmd_rustc_procmacro =3D \ > - $(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \ > + $(RUSTC_OR_CLIPPY) $(rust_common_flags) \ > -Clinker-flavor=3Dgcc -Clinker=3D$(HOSTCC) \ > -Clink-args=3D'$(call escsq,$(KBUILD_PROCMACROLDFLAGS))' \ > --emit=3Ddep-info=3D$(depfile) --emit=3Dlink=3D$@ --extern proc_macro = \ > - --crate-type proc-macro -L$(objtree)/$(obj) \ > + --crate-type proc-macro \ > + -L$(objtree)/$(obj)/host \ > --crate-name $(patsubst lib%.$(libmacros_extension),%,$(notdir $@)) \ > - @$(objtree)/include/generated/rustc_cfg $< > + @$(objtree)/include/generated/rustc_cfg \ > + $(rustc_target_flags) \ > + $< > =20 > # Procedural macros can only be used with the `rustc` that compiled it. > $(obj)/$(libmacros_name): private rustc_target_flags =3D \ > --extern proc_macro2 --extern quote --extern syn > -$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rli= b \ > - $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE > +$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/host/libproc_macro= 2.rlib \ > + $(obj)/host/libquote.rlib $(obj)/host/libsyn.rlib FORCE > +$(call if_changed_dep,rustc_procmacro) > =20 > $(obj)/$(libpin_init_internal_name): private rustc_target_flags =3D $(pi= n_init_internal-flags) > $(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs= \ > - $(obj)/libproc_macro2.rlib $(obj)/libquote.rlib $(obj)/libsyn.rlib F= ORCE > + $(obj)/host/libproc_macro2.rlib $(obj)/host/libquote.rlib $(obj)/hos= t/libsyn.rlib FORCE > +$(call if_changed_dep,rustc_procmacro) > =20 > # `rustc` requires `-Zunstable-options` to use custom target specificati= ons