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Assorted bootstrap LLVM refactors (part 3/N) - #161247

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Assorted bootstrap LLVM refactors (part 3/N)#161247
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@Kobzol Kobzol commented Aug 17, 2026 •
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Continuation of #160916.

This PR removes the llvm_out function, and makes it explicit when we need to build the host LLVM.

Before, bootstrap used to just arbitrarily run a llvm-config binary, even though it might not have been executable on the given host. Now, if we need to execute it, the host LLVM will always be explicitly built. It is possible that there are some cases where this will build LLVM where it didn't before, but that should only happen if you were on a target A, built LLVM for target B, and by sheer luck A could execute code for B (where A != B).
In any case, it is now explicit, so if we encounter such situation, we can fix it without depending on implicit assumptions (well, there are still thousands of other assumptions, but you get my point).

After this, I'll work on centralizing the sanity checking of downloading LLVM inside the LlvmFromCi step, which will allow us to log the exact reason why download-ci-llvm might not have been applied, and also enable downloading LLVM from CI for non-host targets.

r? jieyouxu

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This PR changes how LLVM is built. Consider updating src/bootstrap/download-ci-llvm-stamp.

@rustbot rustbot added A-testsuite Area: The testsuite used to check the correctness of rustc S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-bootstrap Relevant to the bootstrap subteam: Rust's build system (x.py and src/bootstrap) labels Aug 17, 2026
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jieyouxu is currently at their maximum review capacity.
They may take a while to respond.

fbstj
fbstj reviewed Aug 17, 2026
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Comment thread src/bootstrap/src/core/builder/mod.rs Outdated
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AFAICT this generally looks good. One question on the test change.

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Thanks, r=me after pr ci green
@bors rollup=never note="bootstrap llvm rework just in case"

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@Kobzol Kobzol mentioned this pull request Aug 18, 2026
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@bors r=jieyouxu

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📌 Commit 781ef03 has been approved by jieyouxu

It is now in the queue for this repository.

@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-review Status: Awaiting review from the assignee but also interested parties. labels Aug 18, 2026
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@bors p=6 scheduling

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rust-bors Bot pushed a commit that referenced this pull request Aug 19, 2026
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Auto merge of #161247 - Kobzol:bootstrap-llvm-3, r=jieyouxu
55e7b47 
Assorted bootstrap LLVM refactors (part 3/N)

Continuation of #160916.

This PR removes the `llvm_out` function, and makes it explicit when we need to build the host LLVM.

Before, bootstrap used to just arbitrarily run a `llvm-config` binary, even though it might not have been executable on the given host. Now, if we need to execute it, the host LLVM will always be explicitly built. It is possible that there are some cases where this will build LLVM where it didn't before, but that should only happen if you were on a target A, built LLVM for target B, and by sheer luck A could execute code for B (where A != B).
In any case, it is now explicit, so if we encounter such situation, we can fix it without depending on implicit assumptions (well, there are still thousands of other assumptions, but you get my point).

After this, I'll work on centralizing the sanity checking of downloading LLVM inside the `LlvmFromCi` step, which will allow us to log the exact reason why `download-ci-llvm` might not have been applied, and also enable downloading LLVM from CI for non-host targets.

r? jieyouxu
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@rust-bors rust-bors Bot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 19, 2026
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💔 Test for 55e7b47 failed: CI. Failed job:

@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 Aug 20, 2026
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@bors try jobs=dist-aarch64-freebsd

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rust-bors Bot pushed a commit that referenced this pull request Aug 20, 2026
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Auto merge of #161247 - Kobzol:bootstrap-llvm-3, r=<try>
969b4ee 
Assorted bootstrap LLVM refactors (part 3/N)


try-job: dist-aarch64-freebsd
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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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Rebased.

@bors r=jieyouxu

@bors try jobs=dist-aarch64-freebsd

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📌 Commit c6d2681 has been approved by jieyouxu

It is now in the queue for this repository.

@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 Aug 24, 2026
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rust-bors Bot pushed a commit that referenced this pull request Aug 24, 2026
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Auto merge of #161247 - Kobzol:bootstrap-llvm-3, r=<try>
ad9d7cd 
Assorted bootstrap LLVM refactors (part 3/N)


try-job: dist-aarch64-freebsd
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@rust-bors rust-bors Bot added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Aug 24, 2026
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💔 Test for ad9d7cd failed: CI. Failed job:

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@Kobzol

Kobzol commented Aug 24, 2026

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@bors r-

@rust-bors rust-bors Bot removed the S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. label Aug 24, 2026
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@bors try jobs=dist-aarch64-freebsd

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rust-bors Bot pushed a commit that referenced this pull request Aug 24, 2026
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Auto merge of #161247 - Kobzol:bootstrap-llvm-3, r=<try>
cb0b8f1 
Assorted bootstrap LLVM refactors (part 3/N)


try-job: dist-aarch64-freebsd
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☀️ Try build successful (CI)
Build commit: cb0b8f1 (cb0b8f1324f425f453c52fbb5176c2b0bcde7103)
Base parent: 04a3cad (04a3cad16c522be4fd15ca76d3c119c14be68954)

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@bors r=jieyouxu

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📌 Commit 730b9d8 has been approved by jieyouxu

It is now in the queue for this repository.

@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 Aug 24, 2026
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⌛ Testing commit 730b9d8 with merge ac62df9...

Workflow: https://github.com/rust-lang/rust/actions/runs/32717790533

rust-bors Bot pushed a commit that referenced this pull request Aug 24, 2026
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Auto merge of #161247 - Kobzol:bootstrap-llvm-3, r=jieyouxu
ac62df9 
Assorted bootstrap LLVM refactors (part 3/N)



Continuation of #160916.

This PR removes the `llvm_out` function, and makes it explicit when we need to build the host LLVM.

Before, bootstrap used to just arbitrarily run a `llvm-config` binary, even though it might not have been executable on the given host. Now, if we need to execute it, the host LLVM will always be explicitly built. It is possible that there are some cases where this will build LLVM where it didn't before, but that should only happen if you were on a target A, built LLVM for target B, and by sheer luck A could execute code for B (where A != B).
In any case, it is now explicit, so if we encounter such situation, we can fix it without depending on implicit assumptions (well, there are still thousands of other assumptions, but you get my point).

After this, I'll work on centralizing the sanity checking of downloading LLVM inside the `LlvmFromCi` step, which will allow us to log the exact reason why `download-ci-llvm` might not have been applied, and also enable downloading LLVM from CI for non-host targets.

r? jieyouxu
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