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GET /api/patches/2219787/?format=api
{ "id": 2219787, "url": "http://patchwork.ozlabs.org/api/patches/2219787/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260404121610.1956528-2-mkchauras@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "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": "<20260404121610.1956528-2-mkchauras@gmail.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260404121610.1956528-2-mkchauras@gmail.com/", "date": "2026-04-04T12:16:07", "name": "[V9,1/4] rust: Fix \"multiple candidates for rmeta dependency core\" error", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "577bbfc0c74d8ba17032ad89d9fd93b4a9b16d40", "submitter": { "id": 92575, "url": "http://patchwork.ozlabs.org/api/people/92575/?format=api", "name": "Mukesh Kumar Chaurasiya (IBM)", "email": "mkchauras@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260404121610.1956528-2-mkchauras@gmail.com/mbox/", "series": [ { "id": 498722, "url": "http://patchwork.ozlabs.org/api/series/498722/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498722", "date": "2026-04-04T12:16:06", "name": "Rust support for powerpc", "version": 9, "mbox": "http://patchwork.ozlabs.org/series/498722/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219787/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219787/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19310-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "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=mYKJtM60;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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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 occurred because the build system was using `-L$(objtree)/rust`\nfor host library builds (proc_macro2, quote, syn), which caused rustc\nto search the rust/ directory. During this search, rustc would find\nboth the kernel's custom libcore.rmeta and gain access to the host's\nstandard library, creating a conflict.\n\nThe solution is to separate host libraries into a dedicated rust/host/\nsubdirectory and use `-L$(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 with absolute paths\nto reference the proc macros without adding `-L$(objtree)/rust`, which\nwould reintroduce the conflict.\n\nThe rust/host/ directory is added to clean-files to ensure it's removed\nduring `make clean`.\n\nAs there is a lot going on, here's a summary of changes:\n- Add clean-files := host/ to clean the generated directory\n- Change host library targets from lib*.rlib to host/lib*.rlib\n- Update cmd_rustc_procmacrolibrary to create host/ directory\n- Update cmd_rustc_procmacro to use -L$(objtree)/rust/host\n- Update cmd_rustdoc to use -L$(objtree)/rust/host for host builds\n- Update rustdoc-pin_init to use explicit --extern paths for proc macros\n as pin-init also needs alloc crate from -L$(objtree)/rust. So the proc\n macros needs an absolute path\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) <mkchauras@gmail.com>\n---\n rust/Makefile | 57 +++++++++++++++++++++++++++++++--------------------\n 1 file changed, 35 insertions(+), 22 deletions(-)", "diff": "diff --git a/rust/Makefile b/rust/Makefile\nindex 9801af2e1e02..5f726a332d9e 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@@ -193,13 +196,15 @@ rustdoc-proc_macro2: $(src)/proc-macro2/lib.rs rustdoc-clean FORCE\n \t+$(call if_changed,rustdoc)\n \n rustdoc-quote: private rustdoc_host = yes\n-rustdoc-quote: private rustc_target_flags = $(quote-flags)\n+rustdoc-quote: private rustc_target_flags = $(quote-flags) \\\n+ --extern proc_macro2\n rustdoc-quote: private skip_flags = $(quote-skip_flags)\n rustdoc-quote: $(src)/quote/lib.rs rustdoc-clean rustdoc-proc_macro2 FORCE\n \t+$(call if_changed,rustdoc)\n \n rustdoc-syn: private rustdoc_host = yes\n-rustdoc-syn: private rustc_target_flags = $(syn-flags)\n+rustdoc-syn: private rustc_target_flags = $(syn-flags) \\\n+ --extern proc_macro2 --extern quote\n rustdoc-syn: $(src)/syn/lib.rs rustdoc-clean rustdoc-quote FORCE\n \t+$(call if_changed,rustdoc)\n \n@@ -236,7 +241,10 @@ rustdoc-pin_init_internal: $(src)/pin-init/internal/src/lib.rs \\\n \t+$(call if_changed,rustdoc)\n \n rustdoc-pin_init: private rustdoc_host = yes\n-rustdoc-pin_init: private rustc_target_flags = $(pin_init-flags) \\\n+rustdoc-pin_init: private rustc_target_flags = \\\n+ --extern pin_init_internal=$(abspath $(objtree)/$(obj)/$(libpin_init_internal_name)) \\\n+ --extern macros=$(abspath $(objtree)/$(obj)/$(libmacros_name)) \\\n+ $(call cfgs-to-flags,$(pin_init-cfgs)) \\\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@@ -525,48 +533,53 @@ $(obj)/exports_kernel_generated.h: $(obj)/kernel.o FORCE\n \n quiet_cmd_rustc_procmacrolibrary = $(RUSTC_OR_CLIPPY_QUIET) PL $@\n cmd_rustc_procmacrolibrary = \\\n+\tmkdir -p $(dir $@); \\\n \t$(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--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 = $(quote-flags) \\\n+\t-L$(objtree)/$(obj)/host --extern proc_macro2\n+$(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 = $(syn-flags) \\\n+\t-L$(objtree)/$(obj)/host --extern proc_macro2 --extern quote\n+$(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 $@\n cmd_rustc_procmacro = \\\n-\t$(RUSTC_OR_CLIPPY) $(rust_common_flags) $(rustc_target_flags) \\\n+\t$(RUSTC_OR_CLIPPY) $(rust_common_flags) \\\n \t\t-Clinker-flavor=gcc -Clinker=$(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 \\\n+\t\t-L$(objtree)/$(obj)/host \\\n \t\t--crate-name $(patsubst lib%.$(libmacros_extension),%,$(notdir $@)) \\\n-\t\t@$(objtree)/include/generated/rustc_cfg $<\n+\t\t@$(objtree)/include/generated/rustc_cfg \\\n+\t\t$(rustc_target_flags) \\\n+\t\t$<\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": [ "V9", "1/4" ] }