Build: Add `stdenv.cc.cc.lib` to Nix dependencies by PaulDance · Pull Request #152708 · rust-lang/rust

PaulDance · 2026-02-16T11:45:30Z

Otherwise, it systematically fails on:

error: process didn't exit successfully: `[...]/rust/build/bootstrap/debug/rustc [...]/rust/build/bootstrap/debug/rustc -vV` (exit status: 127)
--- stderr
[...]/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory

for us at least. Closes #127620.

@rustbot label T-bootstrap A-reproducibility

rustbot · 2026-02-16T13:09:25Z

r? @clubby789

rustbot has assigned @clubby789.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

Why was this reviewer chosen?

The reviewer was selected based on:

Owners of files modified in this PR: bootstrap
bootstrap expanded to 6 candidates
Random selection from Mark-Simulacrum, clubby789, jieyouxu

clubby789 · 2026-02-16T15:38:02Z

I'm not familiar with Nix, but #127620 seems relevant. In that issue, it seems like further steps were required to get it working (cc @lolbinarycat)

PaulDance · 2026-02-16T16:39:47Z

#127620 seems relevant

Indeed it is. @lolbinarycat should we close the issue with this PR?

In that issue, it seems like further steps were required to get it working

In our case, only the first line is required, removing it definitely breaks the build as indicated in the original description. The second line does not seem necessary for us at least.

clubby789 · 2026-02-19T14:56:35Z

There's a list of explanations for each dep just above your change, can you add an explanation for stdenv.cc.cc.lib too?

This basically LGTM, but I'd like to wait for someone who knows more about Nix/the usage here to comment.

Otherwise, it systematically fails on: ``` error: process didn't exit successfully: `[...]/rust/build/bootstrap/debug/rustc [...]/rust/build/bootstrap/debug/rustc -vV` (exit status: 127) --- stderr [...]/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory ``` for us at least. Signed-off-by: Paul Mabileau <paul.mabileau@harfanglab.fr>

rustbot · 2026-02-19T16:32:58Z

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.

PaulDance · 2026-02-19T16:35:00Z

There's a list of explanations for each dep just above your change, can you add an explanation for stdenv.cc.cc.lib too?

Yup, done.

someone who knows more about Nix/the usage here to comment

@roblabla might be of help here.

adwinwhite · 2026-02-19T23:39:38Z

LGTM.
Thank you for investigating and fixing this. Finally I don't have to patch librustc_driver.so myself.

Going through the U.R.L.O. thread, the problem is that only stage0 compiler is patched.

PaulDance · 2026-02-20T02:39:43Z

What do you mean exactly? I don't quite understand.

adwinwhite · 2026-02-20T05:28:04Z

I was asking whether this change fixes stage1 rustc.

If so, the "rust-stage0-dependencies" name is confusing. At least it got me for a while.

PaulDance · 2026-02-20T13:09:49Z

Yes, it seems to be for stage1 indeed: the message preceding the error was Building stage1 library artifacts (stage1:x86_64-unknown-linux-gnu -> stage1:x86_64-win7-windows-msvc).

For stage0, I guess the same change could also be applied to bootstrap.py that has a similar Nix expression? However, we definitely observe the attempting to patch [...] logs that precede it and no error afterwards, so unless the branch was never taken, the additional dependency does not seem actually needed there, at least for us.

adwinwhite · 2026-02-20T14:25:48Z

Sorry for repeatedly pushing the same concern.

You're right that stage0 rustc doesn't need dynamic libstdc++.so.6 while stage1 rustc needs it.
I just inspected them with ldd ./build/x86_64-unknown-linux-gnu/stage{0,1}/bin/rustc.

Checking all usages of fix_bin_or_dylib, it seems that it's only used for stage0 components.
So I doubt this PR fixes the problem 🤔. an older thread about it
Could you try to run stage1 rustc locally with your change applied? That should verify the effects.

PaulDance · 2026-02-20T16:08:02Z

We currently only build the (x86_64|i686)-win7-windows-msvc targets with it, so this could explain some differences? Otherwise, the error I mentioned in the original description was when recently removing the patch from our build just to check that it was still indeed required before opening this PR, and keeping it has definitely enabled us to build for a long time, so at least for us the change seems to be a sufficient fix.

clubby789 · 2026-02-20T17:46:16Z

Given that this does seem to be a strict improvement for now, I'm happy to merge this unless there's any immediate ideas to make this a more complete fix?

adwinwhite · 2026-02-20T22:33:03Z

Strange that nix has anything do with windows target.
But if it fixes something for you, that's good.

clubby789 · 2026-02-22T10:19:10Z

@bors r+ rollup

rust-bors · 2026-02-22T10:19:12Z

📌 Commit 751b7d5 has been approved by clubby789

It is now in the queue for this repository.

@rustbot

….lib, r=clubby789 Build: Add `stdenv.cc.cc.lib` to Nix dependencies Otherwise, it systematically fails on: ``` error: process didn't exit successfully: `[...]/rust/build/bootstrap/debug/rustc [...]/rust/build/bootstrap/debug/rustc -vV` (exit status: 127) --- stderr [...]/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory ``` for us at least. Closes rust-lang#127620. @rustbot label T-bootstrap A-reproducibility

…uwer Rollup of 5 pull requests Successful merges: - #149366 (GVN: consider constants of primitive types as deterministic) - #152779 (Clarify aspects of query macros) - #152958 (`rustc_queries` simplifications) - #149783 (stabilize `cfg_select!`) - #152708 (Build: Add `stdenv.cc.cc.lib` to Nix dependencies)

@rustbot

….lib, r=clubby789 Build: Add `stdenv.cc.cc.lib` to Nix dependencies Otherwise, it systematically fails on: ``` error: process didn't exit successfully: `[...]/rust/build/bootstrap/debug/rustc [...]/rust/build/bootstrap/debug/rustc -vV` (exit status: 127) --- stderr [...]/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory ``` for us at least. Closes rust-lang#127620. @rustbot label T-bootstrap A-reproducibility

…uwer Rollup of 8 pull requests Successful merges: - #149366 (GVN: consider constants of primitive types as deterministic) - #152779 (Clarify aspects of query macros) - #152958 (`rustc_queries` simplifications) - #152385 (Feature gate for defaulted associated type_consts with associated_type_defaults ) - #152708 (Build: Add `stdenv.cc.cc.lib` to Nix dependencies) - #152921 (Add build.rustdoc option to bootstrap config) - #152926 (Fix ICE when an associated type is wrongly marked as `final`) - #152927 (Index expressions rendered the index: subexpression as the id, instea…)

…uwer Rollup of 7 pull requests Successful merges: - #152779 (Clarify aspects of query macros) - #152958 (`rustc_queries` simplifications) - #152385 (Feature gate for defaulted associated type_consts with associated_type_defaults ) - #152708 (Build: Add `stdenv.cc.cc.lib` to Nix dependencies) - #152921 (Add build.rustdoc option to bootstrap config) - #152926 (Fix ICE when an associated type is wrongly marked as `final`) - #152927 (Index expressions rendered the index: subexpression as the id, instea…)

@rustbot

Rollup merge of #152708 - PaulDance:patches/nix-stdenv.cc.cc.lib, r=clubby789 Build: Add `stdenv.cc.cc.lib` to Nix dependencies Otherwise, it systematically fails on: ``` error: process didn't exit successfully: `[...]/rust/build/bootstrap/debug/rustc [...]/rust/build/bootstrap/debug/rustc -vV` (exit status: 127) --- stderr [...]/rust/build/x86_64-unknown-linux-gnu/stage1/bin/rustc: error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory ``` for us at least. Closes #127620. @rustbot label T-bootstrap A-reproducibility

PaulDance · 2026-02-23T00:50:23Z

Thanks!

PaulDance marked this pull request as ready for review February 16, 2026 13:09

rustbot added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Feb 16, 2026

rustbot assigned clubby789 Feb 16, 2026

rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Feb 16, 2026

PaulDance force-pushed the patches/nix-stdenv.cc.cc.lib branch from 5352c81 to 751b7d5 Compare February 19, 2026 16:32

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-review Status: Awaiting review from the assignee but also interested parties. labels Feb 22, 2026

JonathanBrouwer mentioned this pull request Feb 22, 2026

Rollup of 5 pull requests #152967

Closed

JonathanBrouwer mentioned this pull request Feb 22, 2026

Rollup of 8 pull requests #152982

Closed

JonathanBrouwer mentioned this pull request Feb 22, 2026

Rollup of 7 pull requests #152986

Merged

rust-bors bot merged commit ae8fa15 into rust-lang:main Feb 22, 2026
11 checks passed

rustbot added this to the 1.95.0 milestone Feb 22, 2026

PaulDance deleted the patches/nix-stdenv.cc.cc.lib branch February 23, 2026 00:50

Uh oh!

Comments

Conversation

PaulDance commented Feb 16, 2026 • edited by rustbot Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

rustbot commented Feb 16, 2026

Uh oh!

clubby789 commented Feb 16, 2026

Uh oh!

PaulDance commented Feb 16, 2026

Uh oh!

clubby789 commented Feb 19, 2026

Uh oh!

rustbot commented Feb 19, 2026

Uh oh!

PaulDance commented Feb 19, 2026

Uh oh!

adwinwhite commented Feb 19, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

PaulDance commented Feb 20, 2026

Uh oh!

adwinwhite commented Feb 20, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

PaulDance commented Feb 20, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

adwinwhite commented Feb 20, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Uh oh!

PaulDance commented Feb 20, 2026

Uh oh!

clubby789 commented Feb 20, 2026

Uh oh!

adwinwhite commented Feb 20, 2026

Uh oh!

clubby789 commented Feb 22, 2026

Uh oh!

rust-bors bot commented Feb 22, 2026

Uh oh!

Uh oh!

PaulDance commented Feb 23, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

PaulDance commented Feb 16, 2026 •

edited by rustbot

Loading

adwinwhite commented Feb 19, 2026 •

edited

Loading

adwinwhite commented Feb 20, 2026 •

edited

Loading

PaulDance commented Feb 20, 2026 •

edited

Loading

adwinwhite commented Feb 20, 2026 •

edited

Loading