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Add new unstable attribute: #[export_visibility = ...].#151431

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Add new unstable attribute: #[export_visibility = ...].#151431
anforowicz wants to merge 1 commit intorust-lang:mainfrom
anforowicz:export-visibility

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This PR is an implementation of the RFC tracked in #151425

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rustbot commented Jan 20, 2026

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_passes/src/check_attr.rs

cc @jdonszelmann, @JonathanBrouwer

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

@rustbot rustbot added A-attributes Area: Attributes (`#[…]`, `#![…]`) S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 20, 2026
@rustbot rustbot added the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jan 20, 2026
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rustbot commented Jan 20, 2026

r? @chenyukang

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Kivooeo commented Jan 20, 2026

i had a quick look, mostly looks good, but i'd like to maybe @JonathanBrouwer take a look on this as well, i may overlooked something

r? JonathanBrouwer

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Would like to take a look, will do so tomorrow :)

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Some minor questions, looks good on a high level :)

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@rustbot rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Jan 21, 2026
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rustbot commented Jan 21, 2026

Reminder, once the PR becomes ready for a review, use @rustbot ready.

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@rustbot rustbot added the A-run-make Area: port run-make Makefiles to rmake.rs label Jan 27, 2026
@anforowicz anforowicz force-pushed the export-visibility branch 3 times, most recently from 88ddd87 to a741ebc Compare January 27, 2026 22:55
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@rust-bors rust-bors bot added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Feb 4, 2026
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$ ./x.py build
[...] referenced by CoverageMappingWrapper.cpp
          >>>               ef10e86dc40538c1-CoverageMappingWrapper.o:(.sframe+0x30)

I hit the same issue earlier this week. The reason is the my system GCC got upgraded to a version that enables sframes by default, which lld does not support, causing these linker errors.

I worked around it by building with CXX=clang++ ./x.py build.

Thanks for chiming in. It's quite possible that we are experiencing the same issue. OTOH, when running CXX=clang++ ./x.py build I get: '-Werror=unguarded-availability-new': no option '-Wunguarded-availability-new', so this workaround doesn't seem to help on my machine.

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Actually @bors rollup=iffy
Since this adds a new linker attribute and a few tests for this, and these tend to unexpectedly fail on other targets

Zalathar added a commit to Zalathar/rust that referenced this pull request Feb 5, 2026
…nathanBrouwer

Add new unstable attribute: `#[export_visibility = ...]`.

This PR is an implementation of the RFC tracked in rust-lang#151425
rust-bors bot pushed a commit that referenced this pull request Feb 5, 2026
Rollup of 15 pull requests

Successful merges:

 - #151431 (Add new unstable attribute: `#[export_visibility = ...]`.)
 - #146900 (Add avr_target_feature)
 - #152033 (Rename trait `DepNodeParams` to `DepNodeKey`)
 - #152142 (Convert to inline diagnostics in `rustc_hir_typeck`)
 - #152020 (Remove dummy loads on offload codegen)
 - #152023 (Some `rustc_query_system` cleanups)
 - #152068 (Convert to inline diagnostics in `rustc_resolve`)
 - #152081 (Port depgraph testing attributes to parser)
 - #152090 (Port reexport_test_harness_main to attr parser)
 - #152105 (Convert to inline diagnostics in `rustc_ast_lowering`)
 - #152108 (Convert to inline diagnostics in `rustc_expand`)
 - #152114 (Convert to inline diagnostics in `rustc_mir_transform`)
 - #152115 (Convert to inline diagnostics in `rustc_metadata`)
 - #152116 (Remove rustdoc GUI flaky test)
 - #152128 (Adopt matches-logical-or-141497.rs to LLVM HEAD)

Failed merges:

 - #152070 (Convert to inline diagnostics in `rustc_pattern_analysis`)
 - #152106 (Convert to inline diagnostics in `rustc_ast_passes`)
 - #152109 (Convert to inline diagnostics in `rustc_errors`)
 - #152117 (Convert to inline diagnostics in `rustc_trait_selection`)
 - #152118 (Convert to inline diagnostics in `rustc_codegen_ssa`)
 - #152119 (Convert to inline diagnostics in `rustc_middle`)
 - #152126 (Convert to inline diagnostics in `rustc_mir_build`)
 - #152131 (Port rustc_no_implicit_bounds attribute to parser.)
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Zalathar commented Feb 5, 2026

Failed in rollup in test-various: #152144 (comment)

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@rust-bors rust-bors bot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Feb 5, 2026
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rust-bors bot commented Feb 5, 2026

Commit 7fa9d42 has been unapproved.

This PR was contained in a rollup (#152144), which was also unapproved.

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rustbot commented Feb 5, 2026

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

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The job x86_64-gnu-tools failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)
REPOSITORY                                   TAG       IMAGE ID       CREATED       SIZE
ghcr.io/dependabot/dependabot-updater-core   latest    bcec0b4e062b   10 days ago   783MB
=> Removing docker images...
Deleted Images:
untagged: ghcr.io/dependabot/dependabot-updater-core:latest
untagged: ghcr.io/dependabot/dependabot-updater-core@sha256:b662be51f7b8ef7e2c8464428f14e49cb79c36aa9afb7ecb9221dfe0f507050c
deleted: sha256:bcec0b4e062b5ffe11cc1c2729558c0cd96621c0271ab5e97ff3a56e0c25045a
deleted: sha256:64e147d5e54d9be8b8aa322e511cda02296eda4b8b8d063c6a314833aca50e29
deleted: sha256:5cba409bb463f4e7fa1a19f695450170422582c1bc7c0e934d893b4e5f558bc6
deleted: sha256:cddc6ebd344b0111eaab170ead1dfda24acdfe865ed8a12599a34d338fa8e28b
deleted: sha256:2412c3f334d79134573cd45e657fb6cc0abd75bef3881458b0d498d936545c8d
---
tests/ui/double_parens.rs ... ok
tests/ui/drain_collect.fixed ... ok
tests/ui/duplicate_underscore_argument.rs ... ok
tests/ui/duplicated_attributes.rs ... ok
tests/ui/duration_suboptimal_units.rs ... ok
tests/ui/duration_suboptimal_units_days_weeks.rs ... ok
tests/ui/duration_subsec.rs ... ok
tests/ui/double_parens.fixed ... ok
tests/ui/duration_suboptimal_units_days_weeks.fixed ... ok
tests/ui/duration_suboptimal_units.fixed ... ok
tests/ui/duration_subsec.fixed ... ok
tests/ui/else_if_without_else.rs ... ok
tests/ui/eager_transmute.rs ... ok
tests/ui/elidable_lifetime_names.rs ... ok
tests/ui/empty_docs.rs ... ok
---
..............................................     (146/146)

======== tests/rustdoc-gui/search-filter.goml ========

[ERROR] line 48: Error: The CSS selector "#search-tabs .count.loading" still exists: for command `wait-for-false: "#search-tabs .count.loading"`
    at <file:///checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-gui/doc/test_docs/index.html?search=test>

======== tests/rustdoc-gui/search-result-display.goml ========

[WARNING] line 39: Delta is 0 for "x", maybe try to use `compare-elements-position` instead?

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The failure in the x86_64-gnu-tools job (e.g. https://github.com/rust-lang/rust/actions/runs/21730699234/job/62684356625 and https://triage.rust-lang.org/gha-logs/rust-lang/rust/62684356625) seems unrelated to this PR:

======== tests/rustdoc-gui/search-filter.goml ========
[ERROR] line 48: Error: The CSS selector "#search-tabs .count.loading" still exists: for command `wait-for-false: "#search-tabs .count.loading"`
    at <file:///checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-gui/doc/test_docs/index.html?search=test>
======== tests/rustdoc-gui/search-result-display.goml ========
[WARNING] line 39: Delta is 0 for "x", maybe try to use `compare-elements-position` instead?
<= doc-ui tests done: 145 succeeded, 1 failed, 0 filtered out

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The failure in the x86_64-gnu-tools job (e.g. https://github.com/rust-lang/rust/actions/runs/21730699234/job/62684356625 and https://triage.rust-lang.org/gha-logs/rust-lang/rust/62684356625) seems unrelated to this PR:

======== tests/rustdoc-gui/search-filter.goml ========
[ERROR] line 48: Error: The CSS selector "#search-tabs .count.loading" still exists: for command `wait-for-false: "#search-tabs .count.loading"`
    at <file:///checkout/obj/build/x86_64-unknown-linux-gnu/test/rustdoc-gui/doc/test_docs/index.html?search=test>
======== tests/rustdoc-gui/search-result-display.goml ========
[WARNING] line 39: Delta is 0 for "x", maybe try to use `compare-elements-position` instead?
<= doc-ui tests done: 145 succeeded, 1 failed, 0 filtered out

yes, all PR failed for this CI error.

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Feb 6, 2026
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Reopened to retrigger CI
@bors try jobs=x86_64-msvc-1,i686-msvc-1,x86_64-mingw-1,test-various,armhf-gnu,aarch64-apple,x86_64-gnu-llvm-20-3

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rust-bors bot pushed a commit that referenced this pull request Feb 6, 2026
Add new unstable attribute: `#[export_visibility = ...]`.


try-job: x86_64-msvc-1
try-job: i686-msvc-1
try-job: x86_64-mingw-1
try-job: test-various
try-job: armhf-gnu
try-job: aarch64-apple
try-job: x86_64-gnu-llvm-20-3
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The job test-various failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)
##[group]Runner Image Provisioner
Hosted Compute Agent
Version: 20260123.484
Commit: 6bd6555ca37d84114959e1c76d2c01448ff61c5d
Build Date: 2026-01-23T19:41:17Z
Worker ID: {e4b28ae0-a08a-4df9-a623-dd8479d5e00a}
Azure Region: westcentralus
##[endgroup]
##[group]Operating System
Ubuntu
24.04.3
LTS
---
REPOSITORY                                   TAG       IMAGE ID       CREATED      SIZE
ghcr.io/dependabot/dependabot-updater-core   latest    b72a662c47e3   6 days ago   790MB
=> Removing docker images...
Deleted Images:
untagged: ghcr.io/dependabot/dependabot-updater-core:latest
untagged: ghcr.io/dependabot/dependabot-updater-core@sha256:57ef9cc45f72cc4258ee1baa8243bc3cd55c0a0e570b6768c37346247be35f0d
deleted: sha256:b72a662c47e31df2e7bf59368b2b83be239f02a1baa721393717711a1a719df9
deleted: sha256:3e13ccd80f19769f39008cfc6549938e1ea4905f47b028c1df2dd6085191386c
deleted: sha256:842807995a512b2c5a9b241a3aecdbe79af6b0642d96fa5460cfcf0c9d8be295
deleted: sha256:0f9074b9f46f4570eb7cb4b65fcb3c3d909f9b1d14ca66b30508117b6deda303
deleted: sha256:2ca99cb9251d19157c56b5d91c8961bb4b35196a5ca9b4ffdccbf24abbfe2a5f
---
---- [run-make] tests/run-make/cdylib-export-visibility stdout ----

error: rmake recipe failed to complete
status: exit status: 101
command: cd "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-make/cdylib-export-visibility/rmake_out" && env -u RUSTFLAGS -u __RUSTC_DEBUG_ASSERTIONS_ENABLED -u __STD_DEBUG_ASSERTIONS_ENABLED -u __STD_REMAP_DEBUGINFO_ENABLED AR="/wasi-sdk-29.0-x86_64-linux/bin/llvm-ar" BUILD_ROOT="/checkout/obj/build/x86_64-unknown-linux-gnu" CC="/wasi-sdk-29.0-x86_64-linux/bin/wasm32-wasip1-clang" CC_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fno-exceptions --target=wasm32-wasip1" CXX="/wasi-sdk-29.0-x86_64-linux/bin/wasm32-wasip1-clang++" CXX_DEFAULT_FLAGS="-ffunction-sections -fdata-sections -fno-exceptions --target=wasm32-wasip1" HOST_RUSTC_DYLIB_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib" LD_LIBRARY_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/bootstrap-tools/x86_64-unknown-linux-gnu/release/deps:/checkout/obj/build/x86_64-unknown-linux-gnu/stage0/lib/rustlib/x86_64-unknown-linux-gnu/lib" LD_LIB_PATH_ENVVAR="LD_LIBRARY_PATH" LLVM_BIN_DIR="/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin" LLVM_COMPONENTS="aarch64 aarch64asmparser aarch64codegen aarch64desc aarch64disassembler aarch64info aarch64utils abi aggressiveinstcombine all all-targets amdgpu amdgpuasmparser amdgpucodegen amdgpudesc amdgpudisassembler amdgpuinfo amdgputargetmca amdgpuutils analysis arm armasmparser armcodegen armdesc armdisassembler arminfo armutils asmparser asmprinter avr avrasmparser avrcodegen avrdesc avrdisassembler avrinfo binaryformat bitreader bitstreamreader bitwriter bpf bpfasmparser bpfcodegen bpfdesc bpfdisassembler bpfinfo cas cfguard cgdata codegen codegentypes core coroutines coverage csky cskyasmparser cskycodegen cskydesc cskydisassembler cskyinfo debuginfobtf debuginfocodeview debuginfodwarf debuginfodwarflowlevel debuginfogsym debuginfologicalview debuginfomsf debuginfopdb demangle dlltooldriver dtlto dwarfcfichecker dwarflinker dwarflinkerclassic dwarflinkerparallel dwp engine executionengine extensions filecheck frontendatomic frontenddirective frontenddriver frontendhlsl frontendoffloading frontendopenacc frontendopenmp fuzzercli fuzzmutate globalisel hexagon hexagonasmparser hexagoncodegen hexagondesc hexagondisassembler hexagoninfo hipstdpar instcombine instrumentation interfacestub interpreter ipo irprinter irreader jitlink libdriver lineeditor linker loongarch loongarchasmparser loongarchcodegen loongarchdesc loongarchdisassembler loongarchinfo lto m68k m68kasmparser m68kcodegen m68kdesc m68kdisassembler m68kinfo mc mca mcdisassembler mcjit mcparser mips mipsasmparser mipscodegen mipsdesc mipsdisassembler mipsinfo mirparser msp430 msp430asmparser msp430codegen msp430desc msp430disassembler msp430info native nativecodegen nvptx nvptxcodegen nvptxdesc nvptxinfo objcarcopts objcopy object objectyaml option orcdebugging orcjit orcshared orctargetprocess passes plugins powerpc powerpcasmparser powerpccodegen powerpcdesc powerpcdisassembler powerpcinfo profiledata remarks riscv riscvasmparser riscvcodegen riscvdesc riscvdisassembler riscvinfo riscvtargetmca runtimedyld sandboxir scalaropts selectiondag sparc sparcasmparser sparccodegen sparcdesc sparcdisassembler sparcinfo support supportlsp symbolize systemz systemzasmparser systemzcodegen systemzdesc systemzdisassembler systemzinfo tablegen target targetparser telemetry textapi textapibinaryreader transformutils vectorize webassembly webassemblyasmparser webassemblycodegen webassemblydesc webassemblydisassembler webassemblyinfo webassemblyutils windowsdriver windowsmanifest x86 x86asmparser x86codegen x86desc x86disassembler x86info x86targetmca xray xtensa xtensaasmparser xtensacodegen xtensadesc xtensadisassembler xtensainfo" LLVM_FILECHECK="/checkout/obj/build/x86_64-unknown-linux-gnu/ci-llvm/bin/FileCheck" NODE="/node/bin/node" PYTHON="/usr/bin/python3" RUNNER="/wasmtime-v38.0.4-x86_64-linux/wasmtime run -C cache=n --dir . --env RUSTC_BOOTSTRAP" RUSTC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustc" RUSTDOC="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/bin/rustdoc" SOURCE_ROOT="/checkout" TARGET="wasm32-wasip1" TARGET_EXE_DYLIB_PATH="/checkout/obj/build/x86_64-unknown-linux-gnu/stage2/lib/rustlib/wasm32-wasip1/lib" __BOOTSTRAP_JOBS="4" "/checkout/obj/build/x86_64-unknown-linux-gnu/test/run-make/cdylib-export-visibility/rmake"
stdout: none
--- stderr -------------------------------

thread 'main' (28361) panicked at /checkout/tests/run-make/cdylib-export-visibility/rmake.rs:36:33:
Test #1: failed to read `libfoo.so`: No such file or directory (os error 2)
stack backtrace:
   0: __rustc::rust_begin_unwind
             at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/std/src/panicking.rs:689:5
   1: core::panicking::panic_fmt
             at /rustc/9b1f8ff42d110b0ca138116745be921df5dc97e7/library/core/src/panicking.rs:80:14

@rust-bors rust-bors bot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Feb 6, 2026
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rust-bors bot commented Feb 6, 2026

💔 Test for ae11d92 failed: CI. Failed job:

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