Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools #146186

dpaoliello · 2025-09-04T00:06:25Z

For my purposes, contains fixes when compiling the Rust compiler for Arm64EC.

Checked the commits since 1.2.16, and I don't see anything else that may affect Rust?

find-msvc-tools was also factored out from cc to allow updating the use in rustc_codegen_ssa (finding the linker when running the Rust compiler) to be separate from the use in rustc_llvm (building LLVM as part of the Rust compiler).

rustbot · 2025-09-04T00:06:28Z

Failed to set assignee to NobodyXu: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

rustbot · 2025-09-04T00:06:31Z

These commits modify the Cargo.lock file. Unintentional changes to Cargo.lock can be introduced when switching branches and rebasing PRs.

If this was unintentional then you should revert the changes before this PR is merged.
Otherwise, you can ignore this comment.

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

jieyouxu · 2025-09-04T01:03:49Z

@bors try jobs=aarch64-msvc-1,aarch64-apple,test-various,dist-apple-various

Update cc-rs to 1.2.33 try-job: aarch64-msvc-1 try-job: aarch64-apple try-job: test-various try-job: dist-apple-various

rust-bors · 2025-09-04T03:17:03Z

☀️ Try build successful (CI)
Build commit: d8ac12e (d8ac12e3b0cef5271092800d62ab852417973355, parent: a1208bf765ba783ee4ebdc4c29ab0a0c215806ef)

compiler/rustc_codegen_ssa/Cargo.toml

jieyouxu · 2025-09-04T14:24:37Z

Let me know @dpaoliello if you want to try with find-msvc-tools, otherwise I'm fine with the current change as well.
@rustbot author

rustbot · 2025-09-04T14:24:42Z

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

dpaoliello · 2025-09-04T19:00:31Z

I switched to find-msvc-tools, since I was here changing things.

@rustbot ready

rustbot · 2025-09-04T19:06:53Z

The list of allowed third-party dependencies may have been modified! You must ensure that any new dependencies have compatible licenses before merging.

cc @davidtwco, @wesleywiser

davidtwco · 2025-09-04T21:43:38Z

@bors r=davidtwco,jieyouxu

bors · 2025-09-04T21:43:41Z

📌 Commit 45a0e10 has been approved by davidtwco,jieyouxu

It is now in the queue for this repository.

jieyouxu · 2025-09-05T17:42:03Z

Sorry, wrong bors
@bors2 delegate=try

rust-bors · 2025-09-05T17:42:05Z

✌️ @dpaoliello, you can now perform try builds on this pull request!

You can now post @bors2 try to start a try build.

rustbot · 2025-09-05T18:00:58Z

This PR was rebased onto a different master 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.

dpaoliello · 2025-09-05T18:03:28Z

@bors2 try jobs=dist-aarch64-linux

Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools try-job: dist-aarch64-linux

rust-bors · 2025-09-05T18:27:29Z

💔 Test for 501f1bd failed: CI. Failed jobs:

try - dist-aarch64-linux (web logs, extended logs)

dpaoliello · 2025-09-05T18:31:19Z

There we go:

  configure:3111: clang -O3 -ffunction-sections -fdata-sections -fPIC --target=aarch64-unknown-linux-gnu -fprofile-generate=/tmp/tmp-multistage/opt-artifacts/rustc-pgo -flto=thin -fdebug-prefix-map=/checkout=/rustc/501f1bdbb5e1ad826d9b365e27bcefd98d951e0b -O3 -ffunction-sections -fdata-sections -fPIC --target=aarch64-unknown-linux-gnu -fprofile-generate=/tmp/tmp-multistage/opt-artifacts/rustc-pgo -flto=thin -fdebug-prefix-map=/checkout=/rustc/501f1bdbb5e1ad826d9b365e27bcefd98d951e0b -O3 -ffunction-sections -fdata-sections -fPIC --target=aarch64-unknown-linux-gnu -fprofile-generate=/tmp/tmp-multistage/opt-artifacts/rustc-pgo -flto=thin -fdebug-prefix-map=/checkout=/rustc/501f1bdbb5e1ad826d9b365e27bcefd98d951e0b conftest.c  >&5
  /usr/bin/ld: /rustroot/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib64/libstdc++.so.6: version `CXXABI_1.3.11' not found (required by /rustroot/bin/../lib/LLVMgold.so)
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

Now, what to do about it? I'm not a Linux dev, so I have no idea what's gone wrong...

jieyouxu · 2025-09-06T05:44:37Z

Bisected the change next doors (#146226 (comment)) to cc https://github.com/rust-lang/cc-rs/releases/tag/cc-v1.2.21 and rust-lang/cc-rs#1424, but it's not immediately obvious what's the significance of that change to me.

jieyouxu · 2025-09-06T05:48:06Z

🤔

gcc's -c flag is

Compile or assemble the source files, but do not link. The linking stage simply is not done. The ultimate output is in the form of an object file for each source file.

clang's -c flag is

Only run preprocess, compile, and assemble steps

jieyouxu · 2025-09-06T05:54:37Z

Now, what to do about it? I'm not a Linux dev, so I have no idea what's gone wrong...

Let me ask other people as well

EDIT: asked in #t-compiler/help > compiler `cc` bump failure

Unfortunately I won't have time to dig into this, not until next weekend.

dpaoliello · 2025-09-08T17:35:05Z

@bors2 try jobs=dist-aarch64-linux

Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools try-job: dist-aarch64-linux

rust-bors · 2025-09-08T17:59:33Z

💔 Test for 083d034 failed: CI. Failed jobs:

try - dist-aarch64-linux (web logs, extended logs)

bors · 2025-09-09T08:28:29Z

☔ The latest upstream changes (presumably #146018) made this pull request unmergeable. Please resolve the merge conflicts.

lambdageek · 2025-09-09T14:11:11Z

@dpaoliello nice cleanup. Please consider cherrypicking lambdageek@797c4b1 which should switch rust_windows_rc to use find-msvc-tools, too

lambdageek · 2025-09-09T14:13:39Z

compiler/rustc_codegen_ssa/src/back/linker.rs

@@ -117,7 +117,6 @@ pub(crate) fn get_linker<'a>(
    if sess.target.is_like_msvc
        && let Some(ref tool) = msvc_tool
    {
-        cmd.args(tool.args());


Why is this ok? It looked to me like cc::windows_registry::find_tool can have extra arguments here, while find_msvc_tools::find_tool cannot

The old windows_registry::find_tool never set any args, which is why find_msvc_tools dropped it
https://github.com/rust-lang/cc-rs/blob/3c1325b09a78827fb2beb3ea9e8f1e3f84876b64/src/windows/find_tools.rs#L359-L371

dpaoliello · 2025-09-09T16:07:53Z

Please consider cherrypicking lambdageek@797c4b1 which should switch rust_windows_rc to use find-msvc-tools, too

I have concerns with that change: I don't think we can rely on HOST being set.

I will switch rust_windows_rc to use find-msvc-tools, that seems reasonable, but I suggest that we make find-msvc-tools natively know how to find tools that ship in the Windows SDK.

lambdageek · 2025-09-09T16:45:01Z

I don't think we can rely on HOST being set

From https://doc.rust-lang.org/cargo/reference/environment-variables.html#environment-variables-cargo-sets-for-build-scripts

HOST — the host triple of the Rust compiler.

Is the concern that it might be set to something unexpected when bootstrapping the compiler?

dpaoliello · 2025-09-09T18:17:46Z

... but I suggest that we make find-msvc-tools natively know how to find tools that ship in the Windows SDK.

Decided to implement this myself: rust-lang/cc-rs#1553

jieyouxu self-assigned this Sep 4, 2025

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Auto merge of #146186 - dpaoliello:cc, r=<try>

d8ac12e

Update cc-rs to 1.2.33 try-job: aarch64-msvc-1 try-job: aarch64-apple try-job: test-various try-job: dist-apple-various

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dpaoliello changed the title ~~Update cc-rs to 1.2.33~~ Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools Sep 4, 2025

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dpaoliello force-pushed the cc branch from b8733d8 to 45a0e10 Compare September 4, 2025 19:06

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Auto merge of #146186 - dpaoliello:cc, r=<try>

501f1bd

Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools try-job: dist-aarch64-linux

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dpaoliello mentioned this pull request Sep 8, 2025

cat the entire config.log tikv/jemallocator#142

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Auto merge of #146186 - dpaoliello:cc, r=<try>

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Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools try-job: dist-aarch64-linux

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lambdageek reviewed Sep 9, 2025

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Update cc-rs to 1.2.33

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dpaoliello force-pushed the cc branch from ce89ffe to 18413db Compare September 9, 2025 20:13

Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools #146186

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Update cc-rs to 1.2.33, and switch rustc_codegen_ssa to use find-msvc-tools #146186

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