Rustc broken on musl

[wyndon]

Describe the bug

Rustc doesn't build on musl

Steps To Reproduce

Steps to reproduce the behavior:

1. nix build nixpkgs#pkgsMusl.rustc

Additional context

error: builder for '/nix/store/m2yscndj8c3z3c4ni12glqkl4x8s7xv4-rustc-1.61.0.drv' failed with exit code 2;
       last 10 log lines:
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_DeleteException: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_RaiseException: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_GetIP: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_Backtrace: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_GetCFA: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_GetLanguageSpecificData: symbol not found
       > Error relocating /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/.cargo-wrapped: _Unwind_SetIP: symbol not found
       > failed to run: /nix/store/yr7ad24lix8ffnm1h9w6pfc7h704m4cr-cargo-bootstrap-1.60.0/bin/cargo build --manifest-path /build/rustc-1.61.0-src/src/bootstrap/Cargo.toml --frozen
       > Build completed unsuccessfully in 0:00:00
       > make: *** [Makefile:12: all] Error 1
       For full logs, run 'nix log /nix/store/m2yscndj8c3z3c4ni12glqkl4x8s7xv4-rustc-1.61.0.drv'.

Notify maintainers

@madjar @cstrahan @globin @Havvy

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.18.1-xanmod1, NixOS, 22.11 (Raccoon), 22.11.20220625.66e8dce`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.9.1`
 - channels(root): `"nixos"`
 - channels(wyndon): `""`
 - nixpkgs: `/nix/store/4ax73lz8i9v7jl6llsaqb1lnwal3w1qr-source`

[yu-re-ka]

From what I remember about this issue, rust considers musl == static, putting their own libc build into the binary, in their upstream targets. pkgsStatic.rustc works, and also uses musl.
The problems start with musl + dynamic linking, because that's not really a target supported by upstream rust. Alpine and Void have their patches to support it.

[yu-re-ka]

Related:

rust-lang/compiler-team#422
rust-lang/rust#34987
rust-lang/rust#40113

[alyssais]

I've opened #179554 to mark rustc broken in this case, until we can get a fix.

[wyndon]

I've opened #179554 to mark rustc broken in this case, until we can get a fix.

Can't we use patches from Alpine/Void ?

[alyssais]

Not easily AIUI — it's been tried before. Actually, that never integrated the patches. But still it would be a big task, and doesn't mean we shouldn't mark it broken in the mean time to make it easier to debug build failures.

[yu-re-ka]

Not easily AIUI — it's been tried before. Actually, that never integrated the patches. But still it would be a big task, and doesn't mean we shouldn't mark it broken in the mean time to make it easier to debug build failures.

The commit linked in the final comment integrates the patches:
https://github.com/yu-re-ka/nixpkgs/commit/c3ff9944c85d4e6fb88acda60cf1500ae3be4ba5
But it's messy.

[yu-re-ka]

For good measure I confirmed that patches would still be required with the latest rust release:

Cherry-picked https://github.com/yu-re-ka/nixpkgs/commit/8f19732b39549a243d53dc2e596ccfd9e05b2f6b and https://github.com/yu-re-ka/nixpkgs/commit/70a191471cc247cb15bc05c563b8a8787acc5fb3

error: builder for '/nix/store/006c24x6vz14y14rhqd1gv4iywvgbizg-cargo-1.61.0.drv' failed with exit code 101;
       last 10 log lines:
       >    Compiling toml_edit v0.13.4
       >    Compiling rustc-workspace-hack v1.0.0 (/build/rustc-1.61.0-src/src/tools/rustc-workspace-hack)
       >    Compiling crates-io v0.34.0 (/build/rustc-1.61.0-src/src/tools/cargo/crates/crates-io)
       >    Compiling rustfix v0.6.0
       > error: failed to run custom build command for `cargo v0.62.0 (/build/rustc-1.61.0-src/src/tools/cargo)`
       >
       > Caused by:
       >   process didn't exit successfully: `/build/rustc-1.61.0-src/target/release/build/cargo-a49088ef4874356c/build-script-build` (signal: 11, SIGSEGV: invalid memory reference)
       > warning: build failed, waiting for other jobs to finish...
       > error: build failed

[wolfgangwalther]

pkgsMusl.rustc works for me by now.