add system-llvm-libunwind config option #77703

Keruspe · 2020-10-08T13:25:44Z

allows using the system-wide llvm-libunwind as the unwinder

Workaround for #76020

rust-highfive · 2020-10-08T13:25:47Z

(rust_highfive has picked a reviewer for you, use r? to override)

Mark-Simulacrum · 2020-10-09T00:48:11Z

Do we not expect to be able to fix the linked issue? I would prefer to fix the build rather than working around it like this.

I would also prefer that this not be a separate option that controls two things, that seems error prone -- can we instead make the current llvm-libunwind option take either "system" or "in-tree" or something like that?

Keruspe · 2020-10-09T07:25:12Z

@Mark-Simulacrum I don't know if/how the issue is fixable atm, but regardless I think it could be a useful option to be able to use the system llvm-libunwind.

Just pushed a less intrusive version, using llvm-libunwind=system as you suggested

cuviper · 2020-10-09T17:15:26Z

cc @cuviper

For my part, we don't even have llvm-libunwind packages.

Keruspe · 2020-10-11T10:32:56Z

Proper fix for the initial issue in #77815

Keruspe · 2020-10-13T08:16:30Z

Regardless of #77815, I think it would be a good thing to get this option in

library/unwind/build.rs

src/bootstrap/config.rs

config.toml.example

Keruspe · 2020-10-13T14:39:33Z

Fwiw, with this PR, lddtree on stage1 rustc:

llvm-libunwind disabled:

rustc => bin/rustc (interpreter => /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2)
    librustc_driver-cda070a11d817f0b.so => bin/../lib/librustc_driver-cda070a11d817f0b.so
        libz.so.1 => /usr/host/lib/libz.so.1
        libdl.so.2 => /usr/host/lib/libdl.so.2
        libpthread.so.0 => /usr/host/lib/libpthread.so.0
        libm.so.6 => /usr/host/lib/libm.so.6
        libstdc++.so.6 => /usr/host/lib/libstdc++.so.6
        libgcc_s.so.1 => /usr/host/lib/libgcc_s.so.1
        ld-linux-x86-64.so.2 => /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2
    libstd-ebe70738ef90f50c.so => bin/../lib/libstd-ebe70738ef90f50c.so
    libc.so.6 => /usr/host/lib/libc.so.6

llvm-libunwind in-tree still fails the same way it currently does

llvm-libunwind system:

rustc => bin/rustc (interpreter => /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2)
    librustc_driver-cda070a11d817f0b.so => bin/../lib/librustc_driver-cda070a11d817f0b.so
        libz.so.1 => /usr/host/lib/libz.so.1
        libdl.so.2 => /usr/host/lib/libdl.so.2
        libpthread.so.0 => /usr/host/lib/libpthread.so.0
        libm.so.6 => /usr/host/lib/libm.so.6
        libstdc++.so.6 => /usr/host/lib/libstdc++.so.6
        libunwind.so.1 => /usr/host/lib/libunwind.so.1
        ld-linux-x86-64.so.2 => /usr/x86_64-pc-linux-gnu/lib/ld-linux-x86-64.so.2
    libstd-310057861b09b0d1.so => bin/../lib/libstd-310057861b09b0d1.so
    libc.so.6 => /usr/host/lib/libc.so.6

Keruspe · 2020-10-17T19:22:45Z

@Mark-Simulacrum Did some more testing on some of my systems and I think this is good to go now?

config.toml.example

src/bootstrap/lib.rs

Keruspe · 2020-10-21T12:41:51Z

Not sure what happened with CI here

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Mark-Simulacrum · 2020-10-25T21:52:02Z

r=me with commits squashed

Keruspe · 2020-10-26T14:40:29Z

@Mark-Simulacrum squashed

Mark-Simulacrum · 2020-10-26T15:13:52Z

@bors r+

bors · 2020-10-26T15:13:54Z

📌 Commit 66fa42a has been approved by Mark-Simulacrum

Rollup of 16 pull requests Successful merges: - rust-lang#76635 (Add [T]::as_chunks(_mut)) - rust-lang#77703 (add system-llvm-libunwind config option) - rust-lang#78219 (Prefer to use `print_def_path`) - rust-lang#78298 (Add test for bad NLL higher-ranked subtype) - rust-lang#78332 (Update description for error E0308) - rust-lang#78342 (Use check-pass in single-use-lifetime ui tests) - rust-lang#78347 (Add lexicographical comparison doc) - rust-lang#78348 (Make some functions private that don't have to be public) - rust-lang#78349 (Use its own `TypeckResults` to avoid ICE) - rust-lang#78375 (Use ? in core/std macros) - rust-lang#78377 (Fix typo in debug statement) - rust-lang#78388 (Add some regression tests) - rust-lang#78394 (fix(docs): typo in BufWriter documentation) - rust-lang#78396 (Add compiler support for LLVM's x86_64 ERMSB feature) - rust-lang#78405 (Fix typo in lint description) - rust-lang#78412 (Improve formatting of hash collections docs) Failed merges: r? `@ghost`

tmandry · 2020-10-28T19:10:17Z

This was a breaking change to config.toml, so it deserves an entry in the bootstrap changelog or general changelog. I don't think changelog-seen needs a bump here since the breaking change always results in an error for anyone who was using this.

@rustbot modify labels: +relnotes

Mark-Simulacrum · 2020-10-28T20:46:27Z

Hm, good point. I should really do better at doing so. Would you be up for filing a PR to update the bootstrap changelog? I think general changelog is too high level for this right now.

From #77703.

…imulacrum Add llvm-libunwind change to bootstrap CHANGELOG From rust-lang#77703. This doesn't need a `changelog-seen` version bump because the old values aren't accepted anymore, meaning anyone who was using this had to change it already. r? `@Mark-Simulacrum`

…imulacrum Add llvm-libunwind change to bootstrap CHANGELOG From rust-lang#77703. This doesn't need a `changelog-seen` version bump because the old values aren't accepted anymore, meaning anyone who was using this had to change it already. r? ``@Mark-Simulacrum``

Pkgsrc changes: * Adjust patches, convert tabs to spaces so that tests pass. * Remove patches which are no longer needed (upstream changed) * Minor adjustments for SunOS, e.g. disable stack probes. * Adjust cargo checksum patching accordingly. * Remove commented-out use of PATCHELF on NetBSD, which doesn't work anyway... Upstream changes: Version 1.49.0 (2020-12-31) ============================ Language ----------------------- - [Unions can now implement `Drop`, and you can now have a field in a union with `ManuallyDrop<T>`.][77547] - [You can now cast uninhabited enums to integers.][76199] - [You can now bind by reference and by move in patterns.][76119] This allows you to selectively borrow individual components of a type. E.g. ```rust #[derive(Debug)] struct Person { name: String, age: u8, } let person = Person { name: String::from("Alice"), age: 20, }; // `name` is moved out of person, but `age` is referenced. let Person { name, ref age } = person; println!("{} {}", name, age); ``` Compiler ----------------------- - [Added tier 1\* support for `aarch64-unknown-linux-gnu`.][78228] - [Added tier 2 support for `aarch64-apple-darwin`.][75991] - [Added tier 2 support for `aarch64-pc-windows-msvc`.][75914] - [Added tier 3 support for `mipsel-unknown-none`.][78676] - [Raised the minimum supported LLVM version to LLVM 9.][78848] - [Output from threads spawned in tests is now captured.][78227] - [Change os and vendor values to "none" and "unknown" for some targets][78951] \* Refer to Rust's [platform support page][forge-platform-support] for more information on Rust's tiered platform support. Libraries ----------------------- - [`RangeInclusive` now checks for exhaustion when calling `contains` and indexing.][78109] - [`ToString::to_string` now no longer shrinks the internal buffer in the default implementation.][77997] - [`ops::{Index, IndexMut}` are now implemented for fixed sized arrays of any length.][74989] Stabilized APIs --------------- - [`slice::select_nth_unstable`] - [`slice::select_nth_unstable_by`] - [`slice::select_nth_unstable_by_key`] The following previously stable methods are now `const`. - [`Poll::is_ready`] - [`Poll::is_pending`] Cargo ----------------------- - [Building a crate with `cargo-package` should now be independently reproducible.][cargo/8864] - [`cargo-tree` now marks proc-macro crates.][cargo/8765] - [Added `CARGO_PRIMARY_PACKAGE` build-time environment variable.] [cargo/8758] This variable will be set if the crate being built is one the user selected to build, either with `-p` or through defaults. - [You can now use glob patterns when specifying packages & targets.][cargo/8752] Compatibility Notes ------------------- - [Demoted `i686-unknown-freebsd` from host tier 2 to target tier 2 support.][78746] - [Macros that end with a semi-colon are now treated as statements even if they expand to nothing.][78376] - [Rustc will now check for the validity of some built-in attributes on enum variants.][77015] Previously such invalid or unused attributes could be ignored. - Leading whitespace is stripped more uniformly in documentation comments, which may change behavior. You read [this post about the changes][rustdoc-ws-post] for more details. - [Trait bounds are no longer inferred for associated types.][79904] Internal Only ------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [rustc's internal crates are now compiled using the `initial-exec` Thread Local Storage model.][78201] - [Calculate visibilities once in resolve.][78077] - [Added `system` to the `llvm-libunwind` bootstrap config option.][77703] - [Added `--color` for configuring terminal color support to bootstrap.][79004] [75991]: rust-lang/rust#75991 [78951]: rust-lang/rust#78951 [78848]: rust-lang/rust#78848 [78746]: rust-lang/rust#78746 [78376]: rust-lang/rust#78376 [78228]: rust-lang/rust#78228 [78227]: rust-lang/rust#78227 [78201]: rust-lang/rust#78201 [78109]: rust-lang/rust#78109 [78077]: rust-lang/rust#78077 [77997]: rust-lang/rust#77997 [77703]: rust-lang/rust#77703 [77547]: rust-lang/rust#77547 [77015]: rust-lang/rust#77015 [76199]: rust-lang/rust#76199 [76119]: rust-lang/rust#76119 [75914]: rust-lang/rust#75914 [74989]: rust-lang/rust#74989 [79004]: rust-lang/rust#79004 [78676]: rust-lang/rust#78676 [79904]: rust-lang/rust#79904 [cargo/8864]: rust-lang/cargo#8864 [cargo/8765]: rust-lang/cargo#8765 [cargo/8758]: rust-lang/cargo#8758 [cargo/8752]: rust-lang/cargo#8752 [`slice::select_nth_unstable`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable [`slice::select_nth_unstable_by`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by [`slice::select_nth_unstable_by_key`]: https://doc.rust-lang.org/nightly/std/primitive.slice.html#method.select_nth_unstable_by_key [`hint::spin_loop`]: https://doc.rust-lang.org/stable/std/hint/fn.spin_loop.html [`Poll::is_ready`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_ready [`Poll::is_pending`]: https://doc.rust-lang.org/stable/std/task/enum.Poll.html#method.is_pending [rustdoc-ws-post]: https://blog.guillaume-gomez.fr/articles/2020-11-11+New+doc+comment+handling+in+rustdoc

rust-highfive assigned Mark-Simulacrum Oct 8, 2020

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 8, 2020

This was referenced Oct 8, 2020

Revert "Make libunwind build hermetic" #76026

Closed

1.46.0 fails to build with llvm-libunwind enabled #76020

Closed

Keruspe force-pushed the system-libunwind branch from 28a05d5 to df705a1 Compare October 9, 2020 07:23

Keruspe force-pushed the system-libunwind branch from df705a1 to 2e758f5 Compare October 9, 2020 08:01

Keruspe force-pushed the system-libunwind branch from 2e758f5 to f4639cd Compare October 12, 2020 09:19

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Keruspe force-pushed the system-libunwind branch from 73210ab to c498b03 Compare October 20, 2020 13:07

allow using the system-wide llvm-libunwind as the unwinder

66fa42a

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Mark-Simulacrum 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 Oct 26, 2020

Keruspe force-pushed the system-libunwind branch from c498b03 to 66fa42a Compare October 26, 2020 14:40

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JohnTitor mentioned this pull request Oct 26, 2020

Rollup of 16 pull requests #78421

Merged

bors merged commit 2c307fa into rust-lang:master Oct 27, 2020

rustbot added this to the 1.49.0 milestone Oct 27, 2020

rustbot added the relnotes Marks issues that should be documented in the release notes of the next release. label Oct 28, 2020

tmandry added a commit that referenced this pull request Dec 28, 2020

Add llvm-libunwind change to bootstrap CHANGELOG

8041ccf

From #77703.

tmandry mentioned this pull request Dec 28, 2020

Add llvm-libunwind change to bootstrap CHANGELOG #80461

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add system-llvm-libunwind config option #77703

add system-llvm-libunwind config option #77703

Keruspe commented Oct 8, 2020

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add system-llvm-libunwind config option #77703

add system-llvm-libunwind config option #77703

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