Rollup of 8 pull requests #142762
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Rollup of 8 pull requests #142762
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This does change the logic a bit: previously, we didn't forward reverse implications of negated features to the backend, instead relying on the backend to handle the implication itself.
Co-authored-by: bjorn3 <[email protected]>
rewrite `optimize` attribute to use new attribute parsing infrastructure r? ``@oli-obk`` I'm afraid we'll get quite a few of these PRs in the future. If we get a lot of trivial changes I'll start merging multiple into one PR. They should be easy to review :) Waiting on rust-lang#138165 first
…n, r=nnethercote,WaffleLapkin Extract some shared code from codegen backend target feature handling There's a bunch of code duplication between the GCC and LLVM backends in target feature handling. This moves that into new shared helper functions in `rustc_codegen_ssa`. The first two commits should be purely refactoring. I am fairly sure the LLVM-side behavior stays the same; if the GCC side deliberately diverges from this then I may have missed that. I did account for one divergence, which I do not know is deliberate or not: GCC does not seem to use the `-Ctarget-feature` flag to populate `cfg(target_feature)`. That seems odd, since the `-Ctarget-feature` flag is used to populate the return value of `global_gcc_features` which controls the target features actually used by GCC. `@GuillaumeGomez` `@antoyo` is there a reason `target_config` ignores `-Ctarget-feature` but `global_gcc_features` does not? The second commit also cleans up a bunch of unneeded complexity added in rust-lang#135927. The third commit extracts some shared logic out of the functions that populate `cfg(target_feature)` and the backend target feature set, respectively. This one actually has some slight functional changes: - Before, with `-Ctarget-feature=-feat`, if there is some other feature `x` that implies `feat` we would *not* add `-x` to the backend target feature set. Now, we do. This fixes rust-lang#134792. - The logic that removes `x` from `cfg(target_feature)` in this case also changed a bit, avoiding a large number of calls to the (uncached) `sess.target.implied_target_features` (if there were a large number of positive features listed before a negative feature) but instead constructing a full inverse implication map when encountering the first negative feature. Ideally this would be done with queries but the backend target feature logic runs before `tcx` so we can't use that... - Previously, if feature "a" implied "b" and "b" was unstable, then using `-Ctarget-feature=+a` would also emit a warning about `b`. I had to remove this since when accounting for negative implications, this emits a ton of warnings in a bunch of existing tests... I assume this was unintentional anyway. The fourth commit increases consistency of the GCC backend with the LLVM backend. The last commit does some further cleanup: - Get rid of RUSTC_SPECIAL_FEATURES. It was only needed for s390x "backchain", but since LLVM 19 that is always a regular target feature so we don't need this hack any more. The hack also has various unintended side-effects so we don't want to keep it. Fixes rust-lang#142412. - Move RUSTC_SPECIFIC_FEATURES handling into the shared parse_rust_feature_flag helper so all consumers of `-Ctarget-feature` that only care about actual target features (and not "crt-static") have it. Previously, we actually set `cfg(target_feature = "crt-static")` twice: once in the backend target feature logic, and once specifically for that one feature. IIUC, some targets are meant to ignore `-Ctarget-feature=+crt-static`, it seems like before this PR that flag still incorrectly enabled `cfg(target_feature = "crt-static")` (but I didn't test this). - Move fixed_x18 handling together with retpoline handling. - Forbid setting fixed_x18 as a regular target feature, even unstably. It must be set via the `-Z` flag. `@bjorn3` I did not touch the cranelift backend here, since AFAIK it doesn't really support target features. But if you ever do, please use the new helpers. :) Cc `@workingjubilee`
…r=ChrisDenton,tgross35 Implement send_signal for unix child processes Tracking issue: rust-lang#141975 There are two main differences between my implementation and the Public API section of the tracking issue. ~First, `send_signal` requires a mutable reference, like `Child::kill`.~ Second, `ChildExt` has `Sealed` as a supertrait, bringing it more in line with other extension traits like `CommandExt`. try-job: `dist-various*` try-job: `test-various*`
…=workingjubilee error on calls to ABIs that cannot be called We recently added `extern "custom"`, which cannot be called using a rust call expression. But there are more ABIs that can't be called in that way, because the call does not semantically make sense. More details are in rust-lang#140566 (comment) r? `@workingjubilee`
vec_deque/fmt/vec tests: remove static mut More rust-lang#125035. r? ``@tgross35``
Reduce uses of `hir_crate`. I tried rebasing my old incremental-HIR branch. This is a by-product, which is required if we want to get rid of `hir_crate` entirely. The second commit is a drive-by cleanup. It can be pulled into its own PR. r? ```@oli-obk```
Update books ## rust-lang/book 1 commits in 4433c9f0cad8460bee05ede040587f8a1fa3f1de..8a6d44e45b7b564eeb6bae30507e1fbac439d72d 2025-06-18 17:06:36 UTC to 2025-06-18 17:06:36 UTC - Chapter 12 from tech review (rust-lang/book#4410) ## rust-lang/reference 6 commits in d4c66b346f4b72d29e70390a3fa3ea7d4e064db1..50fc1628f36563958399123829c73755fa7a8421 2025-06-19 02:02:39 UTC to 2025-06-17 21:18:46 UTC - Document inferred const args (`feature(generic_arg_infer)`) (rust-lang/reference#1835) - const_eval: we allow references to statics and promoteds (rust-lang/reference#1858) - Fix missing rule on destructors (rust-lang/reference#1861) - Fix inconsistent heading depth (rust-lang/reference#1860) - Fix recursive root-accessible grammar check (rust-lang/reference#1852) - Fix grammar links (rust-lang/reference#1851) ## rust-lang/rust-by-example 1 commits in 9baa9e863116cb9524a177d5a5c475baac18928a..05c7d8bae65f23a1837430c5a19be129d414f5ec 2025-06-18 13:15:17 UTC to 2025-06-18 13:15:17 UTC - Revert "introduce new ```@media``` query to set a higher content width on ultra wide screens" (rust-lang/rust-by-example#1939)
…r, r=Kobzol add comment to `src/bootstrap/build.rs` I attempted to remove this build script but it's apparently needed. Add a comment for why.
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Jun 20, 2025
Rollup of 8 pull requests Successful merges: - #138291 (rewrite `optimize` attribute to use new attribute parsing infrastructure) - #140920 (Extract some shared code from codegen backend target feature handling) - #141990 (Implement send_signal for unix child processes) - #142597 (error on calls to ABIs that cannot be called) - #142668 (vec_deque/fmt/vec tests: remove static mut) - #142687 (Reduce uses of `hir_crate`.) - #142699 (Update books) - #142714 (add comment to `src/bootstrap/build.rs`) r? `@ghost` `@rustbot` modify labels: rollup
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Successful merges:
optimizeattribute to use new attribute parsing infrastructure #138291 (rewriteoptimizeattribute to use new attribute parsing infrastructure)hir_crate. #142687 (Reduce uses ofhir_crate.)src/bootstrap/build.rs#142714 (add comment tosrc/bootstrap/build.rs)r? @ghost
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