Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies #135767

tdittr · 2025-01-20T12:26:20Z

Tracking issue: #130260

As discussed in the previous PR now the future incompatibility warning is enabled in dependencies.

The warning was added in 1.83, while this change will get into stable in 1.86, which gives crate authors three versions to fix the warning.

r? compiler-errors

compiler-errors · 2025-01-20T13:05:42Z

@rustbot label: +I-lang-nominated +I-easy-decision

compiler-errors · 2025-01-23T18:12:48Z

Looks good to me but waiting on team approval

traviscross · 2025-02-05T16:42:43Z

@rfcbot fcp merge

rfcbot · 2025-02-05T16:42:46Z

Team member @traviscross has proposed to merge this. The next step is review by the rest of the tagged team members:

No concerns currently listed.

Once a majority of reviewers approve (and at most 2 approvals are outstanding), this will enter its final comment period. If you spot a major issue that hasn't been raised at any point in this process, please speak up!

cc @rust-lang/lang-advisors: FCP proposed for lang, please feel free to register concerns.
See this document for info about what commands tagged team members can give me.

tmandry · 2025-02-05T16:43:23Z

@rfcbot reviewed

nikomatsakis · 2025-02-05T16:43:32Z

@rfcbot reviewed

As we decided in #128784, I think it makes sense to either accept invalid ABIs on fn-definitions and fn-pointers (but hard error on calls) or forbid them everywhere. Given that we already forbid them on definitions, this seems fine, we can always change if desired.

rfcbot · 2025-02-05T16:43:58Z

🔔 This is now entering its final comment period, as per the review above. 🔔

compiler-errors · 2025-02-05T16:47:49Z

r=me when FCP is over

bors · 2025-02-12T13:27:26Z

☔ The latest upstream changes (presumably #136897) made this pull request unmergeable. Please resolve the merge conflicts.

rfcbot · 2025-02-15T16:46:34Z

The final comment period, with a disposition to merge, as per the review above, is now complete.

As the automated representative of the governance process, I would like to thank the author for their work and everyone else who contributed.

This will be merged soon.

jieyouxu · 2025-02-28T14:28:51Z

Oh sorry, I think it's because this PR and #137599 both modify the same tests. I'm inclined to let the other PR land first since that's prone to merge conflicts. Please reapprove once #137599 lands and this PR is rebased.

@rustbot blocked (on #137599)

jieyouxu · 2025-03-01T10:57:57Z

#137599 merged, the tests probably need a rebless.
@rustbot label: -S-blocked
@rustbot author

This was left to only warn in the current crate to give users a chance to update their code. Now for 1.86 we also warn users depending on those crates.

Otherwise this test will include a future incompatibility warning on some targets but not others.

tdittr · 2025-03-03T08:05:57Z

No problem, indeed needed a re-bless.

@rustbot ready

bjorn3 · 2025-03-03T10:50:05Z

@bors r=compiler-errors

bors · 2025-03-03T10:50:08Z

📌 Commit 6657aa9 has been approved by compiler-errors

It is now in the queue for this repository.

bors · 2025-03-03T10:50:08Z

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

…iaskrgr Rollup of 12 pull requests Successful merges: - rust-lang#135767 (Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies) - rust-lang#137852 (Remove layouting dead code for non-array SIMD types.) - rust-lang#137863 (Fix pretty printing of unsafe binders) - rust-lang#137882 (do not build additional stage on compiler paths) - rust-lang#137894 (Revert "store ScalarPair via memset when one side is undef and the other side can be memset") - rust-lang#137902 (Make `ast::TokenKind` more like `lexer::TokenKind`) - rust-lang#137921 (Subtree update of `rust-analyzer`) - rust-lang#137922 (A few cleanups after the removal of `cfg(not(parallel))`) - rust-lang#137939 (fix order on shl impl) - rust-lang#137946 (Fix docker run-local docs) - rust-lang#137955 (Always allow rustdoc-json tests to contain long lines) - rust-lang#137958 (triagebot.toml: Don't label `test/rustdoc-json` as A-rustdoc-search) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of rust-lang#135767 - tdittr:fn_ptr_calling_conventions-in-deps, r=compiler-errors Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies Tracking issue: rust-lang#130260 As discussed [in the previous PR](https://github.com/rust-lang/rust/pull/128784/files#r1752533758) now the future incompatibility warning is enabled in dependencies. The warning was added in 1.83, while this change will get into stable in 1.86, which gives crate authors three versions to fix the warning. r? compiler-errors

…iaskrgr Rollup of 12 pull requests Successful merges: - rust-lang#135767 (Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies) - rust-lang#137852 (Remove layouting dead code for non-array SIMD types.) - rust-lang#137863 (Fix pretty printing of unsafe binders) - rust-lang#137882 (do not build additional stage on compiler paths) - rust-lang#137894 (Revert "store ScalarPair via memset when one side is undef and the other side can be memset") - rust-lang#137902 (Make `ast::TokenKind` more like `lexer::TokenKind`) - rust-lang#137921 (Subtree update of `rust-analyzer`) - rust-lang#137922 (A few cleanups after the removal of `cfg(not(parallel))`) - rust-lang#137939 (fix order on shl impl) - rust-lang#137946 (Fix docker run-local docs) - rust-lang#137955 (Always allow rustdoc-json tests to contain long lines) - rust-lang#137958 (triagebot.toml: Don't label `test/rustdoc-json` as A-rustdoc-search) r? `@ghost` `@rustbot` modify labels: rollup

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [rust](https://github.com/rust-lang/rust) | minor | `1.86.0` -> `1.87.0` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>rust-lang/rust (rust)</summary> ### [`v1.87.0`](https://github.com/rust-lang/rust/blob/HEAD/RELEASES.md#Version-1870-2025-05-15) [Compare Source](rust-lang/rust@1.86.0...1.87.0) \========================== <a id="1.87.0-Language"></a> ## Language - [Stabilize `asm_goto` feature](rust-lang/rust#133870) - [Allow parsing open beginning ranges (`..EXPR`) after unary operators `!`, `-`, and `*`](rust-lang/rust#134900). - [Don't require method impls for methods with `Self: Sized` bounds in `impl`s for unsized types](rust-lang/rust#135480) - [Stabilize `feature(precise_capturing_in_traits)` allowing `use<...>` bounds on return position `impl Trait` in `trait`s](rust-lang/rust#138128) <a id="1.87.0-Compiler"></a> ## Compiler - [x86: make SSE2 required for i686 targets and use it to pass SIMD types](rust-lang/rust#135408) <a id="1.87.0-Platform-Support"></a> ## Platform Support - [Remove `i586-pc-windows-msvc` target](rust-lang/rust#137957) Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. [platform-support-doc]: https://doc.rust-lang.org/rustc/platform-support.html <a id="1.87.0-Libraries"></a> ## Libraries - [Stabilize the anonymous pipe API](rust-lang/rust#127154) - [Add support for unbounded left/right shift operations](rust-lang/rust#129375) - [Print pointer metadata in `Debug` impl of raw pointers](rust-lang/rust#135080) - [`Vec::with_capacity` guarantees it allocates with the amount requested, even if `Vec::capacity` returns a different number.](rust-lang/rust#135933) - Most `std::arch` intrinsics which don't take pointer arguments can now be called from safe code if the caller has the appropriate target features already enabled (rust-lang/stdarch#1714, rust-lang/stdarch#1716, rust-lang/stdarch#1717) - [Undeprecate `env::home_dir`](rust-lang/rust#137327) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Macros such as `assert_eq!` and `vec!` now support `const {...}` expressions](rust-lang/rust#138162) <a id="1.87.0-Stabilized-APIs"></a> ## Stabilized APIs - [`Vec::extract_if`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.extract_if) - [`vec::ExtractIf`](https://doc.rust-lang.org/stable/std/vec/struct.ExtractIf.html) - [`LinkedList::extract_if`](https://doc.rust-lang.org/stable/std/collections/struct.LinkedList.html#method.extract_if) - [`linked_list::ExtractIf`](https://doc.rust-lang.org/stable/std/collections/linked_list/struct.ExtractIf.html) - [`<[T]>::split_off`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off) - [`<[T]>::split_off_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_mut) - [`<[T]>::split_off_first`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first) - [`<[T]>::split_off_first_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_first_mut) - [`<[T]>::split_off_last`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last) - [`<[T]>::split_off_last_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_off_last_mut) - [`String::extend_from_within`](https://doc.rust-lang.org/stable/alloc/string/struct.String.html#method.extend_from_within) - [`os_str::Display`](https://doc.rust-lang.org/stable/std/ffi/os_str/struct.Display.html) - [`OsString::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.display) - [`OsStr::display`](https://doc.rust-lang.org/stable/std/ffi/struct.OsStr.html#method.display) - [`io::pipe`](https://doc.rust-lang.org/stable/std/io/fn.pipe.html) - [`io::PipeReader`](https://doc.rust-lang.org/stable/std/io/struct.PipeReader.html) - [`io::PipeWriter`](https://doc.rust-lang.org/stable/std/io/struct.PipeWriter.html) - [`impl From<PipeReader> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeReader%3E-for-OwnedHandle) - [`impl From<PipeWriter> for OwnedHandle`](https://doc.rust-lang.org/stable/std/os/windows/io/struct.OwnedHandle.html#impl-From%3CPipeWriter%3E-for-OwnedHandle) - [`impl From<PipeReader> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html) - [`impl From<PipeWriter> for Stdio`](https://doc.rust-lang.org/stable/std/process/struct.Stdio.html#impl-From%3CPipeWriter%3E-for-Stdio) - [`impl From<PipeReader> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeReader%3E-for-OwnedFd) - [`impl From<PipeWriter> for OwnedFd`](https://doc.rust-lang.org/stable/std/os/fd/struct.OwnedFd.html#impl-From%3CPipeWriter%3E-for-OwnedFd) - [`Box<MaybeUninit<T>>::write`](https://doc.rust-lang.org/stable/std/boxed/struct.Box.html#method.write) - [`impl TryFrom<Vec<u8>> for String`](https://doc.rust-lang.org/stable/std/string/struct.String.html#impl-TryFrom%3CVec%3Cu8%3E%3E-for-String) - [`<*const T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned) - [`<*const T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned) - [`<*mut T>::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.offset_from_unsigned-1) - [`<*mut T>::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/primitive.pointer.html#method.byte_offset_from_unsigned-1) - [`NonNull::offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.offset_from_unsigned) - [`NonNull::byte_offset_from_unsigned`](https://doc.rust-lang.org/stable/std/ptr/struct.NonNull.html#method.byte_offset_from_unsigned) - [`<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.cast_signed) - [`NonZero::<uN>::cast_signed`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_signed-5). - [`<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.cast_unsigned). - [`NonZero::<iN>::cast_unsigned`](https://doc.rust-lang.org/stable/std/num/struct.NonZero.html#method.cast_unsigned-5). - [`<uN>::is_multiple_of`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.is_multiple_of) - [`<uN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shl) - [`<uN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.usize.html#method.unbounded_shr) - [`<iN>::unbounded_shl`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shl) - [`<iN>::unbounded_shr`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.unbounded_shr) - [`<iN>::midpoint`](https://doc.rust-lang.org/stable/std/primitive.isize.html#method.midpoint) - [`<str>::from_utf8`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8) - [`<str>::from_utf8_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_mut) - [`<str>::from_utf8_unchecked`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked) - [`<str>::from_utf8_unchecked_mut`](https://doc.rust-lang.org/stable/std/primitive.str.html#method.from_utf8\_unchecked_mut) These previously stable APIs are now stable in const contexts: - [`core::str::from_utf8_mut`](https://doc.rust-lang.org/stable/std/str/fn.from_utf8\_mut.html) - [`<[T]>::copy_from_slice`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.copy_from_slice) - [`SocketAddr::set_ip`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_ip) - [`SocketAddr::set_port`](https://doc.rust-lang.org/stable/std/net/enum.SocketAddr.html#method.set_port), - [`SocketAddrV4::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_ip) - [`SocketAddrV4::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV4.html#method.set_port), - [`SocketAddrV6::set_ip`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_ip) - [`SocketAddrV6::set_port`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_port) - [`SocketAddrV6::set_flowinfo`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_flowinfo) - [`SocketAddrV6::set_scope_id`](https://doc.rust-lang.org/stable/std/net/struct.SocketAddrV6.html#method.set_scope_id) - [`char::is_digit`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_digit) - [`char::is_whitespace`](https://doc.rust-lang.org/stable/std/primitive.char.html#method.is_whitespace) - [`<[[T; N]]>::as_flattened`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened) - [`<[[T; N]]>::as_flattened_mut`](https://doc.rust-lang.org/stable/std/primitive.slice.html#method.as_flattened_mut) - [`String::into_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.into_bytes) - [`String::as_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_str) - [`String::capacity`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.capacity) - [`String::as_bytes`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_bytes) - [`String::len`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.len) - [`String::is_empty`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.is_empty) - [`String::as_mut_str`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_str) - [`String::as_mut_vec`](https://doc.rust-lang.org/stable/std/string/struct.String.html#method.as_mut_vec) - [`Vec::as_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_ptr) - [`Vec::as_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_slice) - [`Vec::capacity`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.capacity) - [`Vec::len`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.len) - [`Vec::is_empty`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.is_empty) - [`Vec::as_mut_slice`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_slice) - [`Vec::as_mut_ptr`](https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.as_mut_ptr) <a id="1.87.0-Cargo"></a> ## Cargo - [Add terminal integration via ANSI OSC 9;4 sequences](rust-lang/cargo#14615) - [chore: bump openssl to v3](rust-lang/cargo#15232) - [feat(package): add --exclude-lockfile flag](rust-lang/cargo#15234) <a id="1.87.0-Compatibility-Notes"></a> ## Compatibility Notes - [Rust now raises an error for macro invocations inside the `#![crate_name]` attribute](rust-lang/rust#127581) - [Unstable fields are now always considered to be inhabited](rust-lang/rust#133889) - [Macro arguments of unary operators followed by open beginning ranges may now be matched differently](rust-lang/rust#134900) - [Make `Debug` impl of raw pointers print metadata if present](rust-lang/rust#135080) - [Warn against function pointers using unsupported ABI strings in dependencies](rust-lang/rust#135767) - [Associated types on `dyn` types are no longer deduplicated](rust-lang/rust#136458) - [Forbid attributes on `..` inside of struct patterns (`let Struct { #[attribute] .. }) =`](rust-lang/rust#136490) - [Make `ptr_cast_add_auto_to_object` lint into hard error](rust-lang/rust#136764) - Many `std::arch` intrinsics are now safe to call in some contexts, there may now be new `unused_unsafe` warnings in existing codebases. - [Limit `width` and `precision` formatting options to 16 bits on all targets](rust-lang/rust#136932) - [Turn order dependent trait objects future incompat warning into a hard error](rust-lang/rust#136968) - [Denote `ControlFlow` as `#[must_use]`](rust-lang/rust#137449) - [Windows: The standard library no longer links `advapi32`, except on win7.](rust-lang/rust#138233) Code such as C libraries that were relying on this assumption may need to explicitly link advapi32. - [Proc macros can no longer observe expanded `cfg(true)` attributes.](rust-lang/rust#138844) - [Start changing the internal representation of pasted tokens](rust-lang/rust#124141). Certain invalid declarative macros that were previously accepted in obscure circumstances are now correctly rejected by the compiler. Use of a `tt` fragment specifier can often fix these macros. - [Don't allow flattened format_args in const.](rust-lang/rust#139624) <a id="1.87.0-Internal-Changes"></a> ## Internal Changes These changes do not affect any public interfaces of Rust, but they represent significant improvements to the performance or internals of rustc and related tools. - [Update to LLVM 20](rust-lang/rust#135763) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

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tdittr force-pushed the fn_ptr_calling_conventions-in-deps branch from 739dd7a to 55dc131 Compare January 21, 2025 09:33

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tdittr added 4 commits March 3, 2025 08:52

After introducing the warning in 1.83, now also warn in deps

9b78d48

This was left to only warn in the current crate to give users a chance to update their code. Now for 1.86 we also warn users depending on those crates.

Bless UI tests

2bf5cc9

Change variadic-ffi-2 to use a platform independant ABI

310f837

Otherwise this test will include a future incompatibility warning on some targets but not others.

Bless UI tests

6657aa9

tdittr force-pushed the fn_ptr_calling_conventions-in-deps branch from ab4ad6b to 6657aa9 Compare March 3, 2025 08:04

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matthiaskrgr mentioned this pull request Mar 3, 2025

Rollup of 12 pull requests #137959

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bors merged commit 1b4e66e into rust-lang:master Mar 4, 2025
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Draft release notes for 1.87 #140133

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Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies #135767

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bjorn3 commented Mar 3, 2025

bors commented Mar 3, 2025

bors commented Mar 3, 2025

Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies #135767

Future incompatibility warning `unsupported_fn_ptr_calling_conventions`: Also warn in dependencies #135767

rfcbot commented Feb 5, 2025 •

edited

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nikomatsakis commented Feb 5, 2025 •

edited

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jieyouxu commented Feb 28, 2025 •

edited

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