{"id":2224558,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2224558/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260417152253.2312961-2-mkchauras@gmail.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.2/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/","list_archive_url":"https://lore.kernel.org/linuxppc-dev/","list_archive_url_format":"https://lore.kernel.org/linuxppc-dev/{}/","commit_url_format":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}"},"msgid":"<20260417152253.2312961-2-mkchauras@gmail.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/20260417152253.2312961-2-mkchauras@gmail.com/","date":"2026-04-17T15:22:50","name":"[V11,1/4] rust: Fix \"multiple candidates for rmeta dependency core\" error","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"5b72ee2a8d23fe7b2fb4987ab7d13532c8e58093","submitter":{"id":92575,"url":"http://patchwork.ozlabs.org/api/1.2/people/92575/?format=json","name":"Mukesh Kumar Chaurasiya (IBM)","email":"mkchauras@gmail.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260417152253.2312961-2-mkchauras@gmail.com/mbox/","series":[{"id":500363,"url":"http://patchwork.ozlabs.org/api/1.2/series/500363/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=500363","date":"2026-04-17T15:22:49","name":"Rust support for powerpc","version":11,"mbox":"http://patchwork.ozlabs.org/series/500363/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2224558/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2224558/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=fvHfzJ9N;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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The host's standard library from the rustup toolchain\n2. The kernel's custom libcore.rmeta in the rust/ directory\n\nThis occurs because the build system uses `-L$(objtree)/rust` for host\nlibrary builds (proc_macro2, quote, syn), which causes rustc to search\nthe rust/ directory. During this search, rustc finds both the kernel's\ncustom libcore.rmeta and gains access to the host's standard library,\ncreating a conflict.\n\nThe solution is to separate host libraries into a dedicated rust/host/\nsubdirectory and use `-L$(objtree)/rust/host` for host builds instead\nof `-L$(objtree)/rust`. This ensures that:\n\n1. Host library builds (proc_macro2, quote, syn) only search rust/host/\n and never encounter the kernel's libcore.rmeta\n2. Proc macro builds use `-L$(objtree)/rust/host` to find their\n dependencies\n\nSpecial handling is added for rustdoc-pin_init, which is a host build\n(to access the alloc crate) but depends on proc macros from the main\nrust/ directory. It uses explicit `--extern` paths to reference the\nproc macros without adding `-L$(objtree)/rust`, which would reintroduce\nthe conflict.\n\nThe rust/host/ directory is added to clean-files to ensure it's removed\nduring `make clean`.\n\nLink: https://github.com/Rust-for-Linux/linux/issues/105\nLink: https://github.com/linuxppc/issues/issues/451\nSigned-off-by: Mukesh Kumar Chaurasiya (IBM) \n---\n rust/Makefile | 38 +++++++++++++++++++++-----------------\n 1 file changed, 21 insertions(+), 17 deletions(-)","diff":"diff --git a/rust/Makefile b/rust/Makefile\nindex 9801af2e1e02..e234b8a39358 100644\n--- a/rust/Makefile\n+++ b/rust/Makefile\n@@ -3,6 +3,9 @@\n # Where to place rustdoc generated documentation\n rustdoc_output := $(objtree)/Documentation/output/rust/rustdoc\n \n+# Clean generated host directory\n+clean-files := host/\n+\n obj-$(CONFIG_RUST) += core.o compiler_builtins.o ffi.o\n always-$(CONFIG_RUST) += exports_core_generated.h\n \n@@ -27,7 +30,7 @@ endif\n \n obj-$(CONFIG_RUST) += exports.o\n \n-always-$(CONFIG_RUST) += libproc_macro2.rlib libquote.rlib libsyn.rlib\n+always-$(CONFIG_RUST) += host/libproc_macro2.rlib host/libquote.rlib host/libsyn.rlib\n \n always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated.rs\n always-$(CONFIG_RUST_KERNEL_DOCTESTS) += doctests_kernel_generated_kunit.c\n@@ -150,7 +153,7 @@ quiet_cmd_rustdoc = RUSTDOC $(if $(rustdoc_host),H, ) $<\n \tOBJTREE=$(abspath $(objtree)) \\\n \t$(RUSTDOC) $(filter-out $(skip_flags) --remap-path-prefix=% --remap-path-scope=%, \\\n \t\t\t$(if $(rustdoc_host),$(rust_common_flags),$(rust_flags))) \\\n-\t\t$(rustc_target_flags) -L$(objtree)/$(obj) \\\n+\t\t$(rustc_target_flags) -L$(objtree)/$(obj)$(if $(rustdoc_host),/host) \\\n \t\t-Zunstable-options --generate-link-to-definition \\\n \t\t--output $(rustdoc_output) \\\n \t\t--crate-name $(subst rustdoc-,,$@) \\\n@@ -237,6 +240,7 @@ rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \\\n \n rustdoc-pin_init: private rustdoc_host = yes\n rustdoc-pin_init: private rustc_target_flags = $(pin_init-flags) \\\n+ --extern pin_init_internal=$(objtree)/$(obj)/$(libpin_init_internal_name) \\\n --extern alloc --cfg feature=\\\"alloc\\\"\n rustdoc-pin_init: $(src)/pin-init/src/lib.rs rustdoc-pin_init_internal \\\n rustdoc-macros FORCE\n@@ -528,23 +532,23 @@ quiet_cmd_rustc_procmacrolibrary = $(RUSTC_OR_CLIPPY_QUIET) PL $@\n \t$(if $(skip_clippy),$(RUSTC),$(RUSTC_OR_CLIPPY)) \\\n \t\t$(filter-out $(skip_flags),$(rust_common_flags) $(rustc_target_flags)) \\\n \t\t--emit=dep-info=$(depfile) --emit=link=$@ --crate-type rlib -O \\\n-\t\t--out-dir $(objtree)/$(obj) -L$(objtree)/$(obj) \\\n+\t\t--out-dir $(objtree)/$(obj)/host -\\L$(objtree)/$(obj)/host \\\n \t\t--crate-name $(patsubst lib%.rlib,%,$(notdir $@)) $<\n \n-$(obj)/libproc_macro2.rlib: private skip_clippy = 1\n-$(obj)/libproc_macro2.rlib: private rustc_target_flags = $(proc_macro2-flags)\n-$(obj)/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE\n+$(obj)/host/libproc_macro2.rlib: private skip_clippy = 1\n+$(obj)/host/libproc_macro2.rlib: private rustc_target_flags = $(proc_macro2-flags)\n+$(obj)/host/libproc_macro2.rlib: $(src)/proc-macro2/lib.rs FORCE\n \t+$(call if_changed_dep,rustc_procmacrolibrary)\n \n-$(obj)/libquote.rlib: private skip_clippy = 1\n-$(obj)/libquote.rlib: private skip_flags = $(quote-skip_flags)\n-$(obj)/libquote.rlib: private rustc_target_flags = $(quote-flags)\n-$(obj)/libquote.rlib: $(src)/quote/lib.rs $(obj)/libproc_macro2.rlib FORCE\n+$(obj)/host/libquote.rlib: private skip_clippy = 1\n+$(obj)/host/libquote.rlib: private skip_flags = $(quote-skip_flags)\n+$(obj)/host/libquote.rlib: private rustc_target_flags = $(quote-flags)\n+$(obj)/host/libquote.rlib: $(src)/quote/lib.rs $(obj)/host/libproc_macro2.rlib FORCE\n \t+$(call if_changed_dep,rustc_procmacrolibrary)\n \n-$(obj)/libsyn.rlib: private skip_clippy = 1\n-$(obj)/libsyn.rlib: private rustc_target_flags = $(syn-flags)\n-$(obj)/libsyn.rlib: $(src)/syn/lib.rs $(obj)/libquote.rlib FORCE\n+$(obj)/host/libsyn.rlib: private skip_clippy = 1\n+$(obj)/host/libsyn.rlib: private rustc_target_flags = $(syn-flags)\n+$(obj)/host/libsyn.rlib: $(src)/syn/lib.rs $(obj)/host/libquote.rlib FORCE\n \t+$(call if_changed_dep,rustc_procmacrolibrary)\n \n quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@\n@@ -553,20 +557,20 @@ quiet_cmd_rustc_procmacro = $(RUSTC_OR_CLIPPY_QUIET) P $@\n \t\t-Clinker-flavor=gcc -Clinker=$(HOSTCC) \\\n \t\t-Clink-args='$(call escsq,$(KBUILD_PROCMACROLDFLAGS))' \\\n \t\t--emit=dep-info=$(depfile) --emit=link=$@ --extern proc_macro \\\n-\t\t--crate-type proc-macro -L$(objtree)/$(obj) \\\n+\t\t--crate-type proc-macro -L$(objtree)/$(obj)/host \\\n \t\t--crate-name $(patsubst lib%.$(libmacros_extension),%,$(notdir $@)) \\\n \t\t@$(objtree)/include/generated/rustc_cfg $<\n \n # Procedural macros can only be used with the `rustc` that compiled it.\n $(obj)/$(libmacros_name): private rustc_target_flags = \\\n --extern proc_macro2 --extern quote --extern syn\n-$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/libproc_macro2.rlib \\\n- $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE\n+$(obj)/$(libmacros_name): $(src)/macros/lib.rs $(obj)/host/libproc_macro2.rlib \\\n+ $(obj)/host/libquote.rlib $(obj)/host/libsyn.rlib FORCE\n \t+$(call if_changed_dep,rustc_procmacro)\n \n $(obj)/$(libpin_init_internal_name): private rustc_target_flags = $(pin_init_internal-flags)\n $(obj)/$(libpin_init_internal_name): $(src)/pin-init/internal/src/lib.rs \\\n- $(obj)/libproc_macro2.rlib $(obj)/libquote.rlib $(obj)/libsyn.rlib FORCE\n+ $(obj)/host/libproc_macro2.rlib $(obj)/host/libquote.rlib $(obj)/host/libsyn.rlib FORCE\n \t+$(call if_changed_dep,rustc_procmacro)\n \n # `rustc` requires `-Zunstable-options` to use custom target specifications\n","prefixes":["V11","1/4"]}