Remove unused feature gates from library/ crates #76866

est31 · 2020-09-18T07:40:43Z

Removes some unused feature gates from library crates. It's likely not a complete list as I only tested a subset for which it's more likely that it is unused.

Libc isn't used by alloc. And std and panic_* use libc from crates.io now, which isn't feature gated.

rust-highfive · 2020-09-18T07:40:46Z

r? @LukasKalbertodt

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library/alloc/src/lib.rs

lcnr · 2020-09-18T09:04:51Z

r? @lcnr

Feel free to either move this up or just merge this as is

@bors rollup
@bors delegate+

bors · 2020-09-18T09:04:53Z

✌️ @est31 can now approve this pull request

lcnr · 2020-09-18T09:14:14Z

@bors r+

bors · 2020-09-18T09:14:15Z

📌 Commit f272896 has been approved by lcnr

Remove unused feature gates from library/ crates Removes some unused feature gates from library crates. It's likely not a complete list as I only tested a subset for which it's more likely that it is unused.

Dylan-DPC-zz · 2020-09-19T23:55:25Z

failed in rollup

@bors r-

est31 · 2020-09-20T02:28:12Z

Huh, interesting. The only x86_64 target where base.max_atomic_width is set to Some(128) is the apple family of targets. That's why I didn't catch it. Does this make sense? It's for a separate issue/PR to figure that out though.

est31 · 2020-09-20T02:31:08Z

$ rg max_atomic_width | rg 128
compiler/rustc_target/src/spec/aarch64_linux_android.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_unknown_none.rs:        max_atomic_width: Some(128),
compiler/rustc_target/src/spec/aarch64_unknown_linux_musl.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_apple_ios.rs:            max_atomic_width: Some(128),
compiler/rustc_target/src/spec/aarch64_unknown_netbsd.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_apple_darwin.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/x86_64_apple_darwin.rs:    base.max_atomic_width = Some(128); // core2 support cmpxchg16b
compiler/rustc_target/src/spec/aarch64_unknown_none_softfloat.rs:        max_atomic_width: Some(128),
compiler/rustc_target/src/spec/aarch64_unknown_freebsd.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_unknown_linux_gnu.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_apple_tvos.rs:            max_atomic_width: Some(128),
compiler/rustc_target/src/spec/aarch64_unknown_hermit.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_unknown_cloudabi.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_wrs_vxworks.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_unknown_openbsd.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_unknown_redox.rs:    base.max_atomic_width = Some(128);
compiler/rustc_target/src/spec/aarch64_fuchsia.rs:    base.max_atomic_width = Some(128);

All aarch64 platforms except for 86_64_apple_darwin.rs. Does an instruction simply disappear on other OSs? Does apple ship custom microcode? :p.

est31 · 2020-09-20T02:47:22Z

The issue needs fixing one way or another. It's been fixed by re-adding the feature gate. re-r? @lcnr

est31 · 2020-09-20T02:48:32Z

Regarding my question, see #76952

est31 · 2020-09-20T11:27:50Z

@bors r+ r=lcnr

bors · 2020-09-20T11:27:51Z

📌 Commit 562422e has been approved by est31

bors · 2020-09-20T11:27:53Z

💡 This pull request was already approved, no need to approve it again.

There's another pull request that is currently being tested, blocking this pull request: Rollup of 15 pull requests #76964

bors · 2020-09-20T11:27:54Z

📌 Commit 562422e has been approved by lcnr

Remove unused feature gates from library/ crates Removes some unused feature gates from library crates. It's likely not a complete list as I only tested a subset for which it's more likely that it is unused.

Rollup of 15 pull requests Successful merges: - rust-lang#76732 (Add docs for `BasicBlock`) - rust-lang#76832 (Let backends define custom targets) - rust-lang#76866 (Remove unused feature gates from library/ crates) - rust-lang#76875 (Move to intra-doc links in library/alloc/src/collections/binary_heap.rs) - rust-lang#76876 (Move to intra-doc links in collections/btree/map.rs and collections/linked_list.rs) - rust-lang#76877 (Move to intra-doc links in collections/vec_deque.rs and collections/vec_deque/drain.rs) - rust-lang#76878 (Move the version number to a plaintext file) - rust-lang#76883 (README.md: Remove prompts from code blocks) - rust-lang#76887 (Add missing examples on HashSet iter types) - rust-lang#76890 (use matches!() macro for simple if let conditions) - rust-lang#76891 (don't take `TyCtxt` by reference) - rust-lang#76910 (transmute: use diagnostic item) - rust-lang#76924 (Add tracking issue for feature(unix_socket_peek)) - rust-lang#76926 (BTreeMap: code readability tweaks) - rust-lang#76940 (Don't allow implementing trait directly on type-alias-impl-trait) Failed merges: r? `@ghost`

Remove unused libc feature gate

baafc71

Libc isn't used by alloc. And std and panic_* use libc from crates.io now, which isn't feature gated.

rust-highfive assigned LukasKalbertodt Sep 18, 2020

rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Sep 18, 2020

est31 force-pushed the master branch from 5f7cd9c to 6c701f7 Compare September 18, 2020 07:48

lcnr reviewed Sep 18, 2020

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library/alloc/src/lib.rs Outdated Show resolved Hide resolved

rust-highfive assigned lcnr and unassigned LukasKalbertodt Sep 18, 2020

est31 force-pushed the master branch from 6c701f7 to f272896 Compare September 18, 2020 09:09

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 Sep 18, 2020

RalfJung mentioned this pull request Sep 19, 2020

Rollup of 15 pull requests #76937

Closed

This was referenced Sep 19, 2020

Rollup of 19 pull requests #76947

Closed

Rollup of 19 pull requests #76948

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bors 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-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Sep 19, 2020

Remove some unused features from alloc core and std

562422e

est31 force-pushed the master branch from f272896 to 562422e Compare September 20, 2020 02:29

est31 mentioned this pull request Sep 20, 2020

Why does only x86_64_apple_darwin have max_atomic_width set to 128? #76952

Closed

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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Sep 20, 2020

This was referenced Sep 20, 2020

Rollup of 15 pull requests #76974

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Rollup of 15 pull requests #76975

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bors merged commit bea0ae7 into rust-lang:master Sep 20, 2020

rustbot added this to the 1.48.0 milestone Sep 20, 2020

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