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Fix autodiff incorrectly applying fat-lto to proc-macro crates #147792

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Fix autodiff incorrectly applying fat-lto to proc-macro crates #147792

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@osamakader osamakader commented Oct 16, 2025 •
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Fixes #147487
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rustbot commented Oct 16, 2025

r? @petrochenkov

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@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 16, 2025
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r=me after fixing up the commit message #147792 (comment).
@bors rollup
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@rustbot rustbot 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 17, 2025
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Reminder, once the PR becomes ready for a review, use @rustbot ready.
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Fix autodiff incorrectly applying fat-lto to proc-macro crates
e67d502 
When -Z autodiff=Enable is used, the compiler automatically enables fat-lto for all crates. However, proc-macro crates cannot use fat-lto without the -Zdylib-lto flag, causing compilation errors. This commit modifies the lto() method in Session to exclude proc-macro crates from fat-lto when autodiff is enabled, while preserving the existing behavior for all other crate types. The fix ensures that: - Non-proc-macro crates still get fat-lto when autodiff is enabled - Proc-macro crates are excluded from fat-lto when autodiff is enabled - Existing autodiff functionality remains unchanged for regular crates Signed-off-by: Osama Abdelkader <osama.abdelkader@gmail.com>
@osamakader osamakader force-pushed the fix-autodiff-proc-macro-lto branch from e75f796 to e67d502 Compare October 17, 2025 13:53
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@rustbot ready.
@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Oct 17, 2025
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@bors r+
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bors commented Oct 17, 2025

📌 Commit e67d502 has been approved by petrochenkov

It is now in the queue for this repository.
@bors bors 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 Oct 17, 2025
GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Oct 17, 2025
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Rollup merge of rust-lang#147792 - osamakader:fix-autodiff-proc-macro…
9e7909a 
…-lto, r=petrochenkov Fix autodiff incorrectly applying fat-lto to proc-macro crates Fixes rust-lang#147487
@GuillaumeGomez GuillaumeGomez mentioned this pull request Oct 17, 2025
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GuillaumeGomez added a commit to GuillaumeGomez/rust that referenced this pull request Oct 17, 2025
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Rollup merge of rust-lang#147792 - osamakader:fix-autodiff-proc-macro…
063bf04 
…-lto, r=petrochenkov Fix autodiff incorrectly applying fat-lto to proc-macro crates Fixes rust-lang#147487
@GuillaumeGomez GuillaumeGomez mentioned this pull request Oct 17, 2025
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bors added a commit that referenced this pull request Oct 17, 2025
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Auto merge of #147822 - GuillaumeGomez:rollup-338omm1, r=GuillaumeGomez
2593d24 
Rollup of 7 pull requests Successful merges: - #140153 (Implement `Debug` for `EncodeWide`) - #147454 (Fix backtraces with `-C panic=abort` on qnx; emit unwind tables by default) - #147468 (Implement fs api set_times and set_times_nofollow) - #147494 (std::thread spawn: Docs: Link to Builder::spawn; Make same.) - #147783 (bootstrap: migrate to object 0.37) - #147792 (Fix autodiff incorrectly applying fat-lto to proc-macro crates ) - #147809 (rustdoc: Fix passes order so intra-doc links are collected after stripping passes) r? `@ghost` `@rustbot` modify labels: rollup
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