✨ feat: add Ruby 4.1 version support for ruby-head compatibility #697
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Ruby 4.1 (ruby-head) introduces breaking C API changes that require conditional compilation in dependent crates. This adds 4.1 to the supported version arrays to enable ruby_lt_4_1, ruby_gte_4_1, and related cfg flags. Changes: - Add Version::new(4, 1) to SUPPORTED_RUBY_VERSIONS in rb-sys - Add (4, 0) and (4, 1) to COMPARABLE_RUBY_MINORS in rb-sys-env This enables crates like magnus to handle the rb_data_type_struct change where 'reserved' was replaced with 'handle_weak_references'. Closes oxidize-rb#696
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Pull request overview
This PR adds Ruby 4.1 version support to enable compatibility with ruby-head, which introduces breaking changes in the Ruby C API (specifically the replacement of the reserved field with handle_weak_references in rb_data_type_struct__bindgen_ty_1). The changes also fix a previously missing (4, 0) entry in the comparable minors array.
- Added Ruby 4.1 to supported version arrays in two key modules
- Fixed missing Ruby 4.0 entry in COMPARABLE_RUBY_MINORS array (synchronization fix)
- Enables version-based cfg flags for conditional compilation targeting Ruby 4.1
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.
| File | Description |
|---|---|
crates/rb-sys/build/main.rs |
Added Version::new(4, 1) to SUPPORTED_RUBY_VERSIONS array and updated array size from 11 to 12 |
crates/rb-sys-env/src/ruby_version.rs |
Added (4, 0) and (4, 1) to COMPARABLE_RUBY_MINORS array and updated array size from 11 to 13, fixing previous missing (4, 0) entry |
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ianks
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Jan 5, 2026
This was referenced Jan 5, 2026
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pboling
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Jan 6, 2026
- Ruby 4.0, 4.1 compat - oxidize-rb/rb-sys#697
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Description
This PR adds Ruby 4.1 to the supported version arrays, enabling version-based cfg flags for Ruby head compatibility.
Changes
crates/rb-sys/build/main.rsVersion::new(4, 1)toSUPPORTED_RUBY_VERSIONSarraycrates/rb-sys-env/src/ruby_version.rs(4, 0)and(4, 1)toCOMPARABLE_RUBY_MINORSarrayNew cfg flags available
After this change, the following cfg flags will be available when building with Ruby 4.1:
ruby_lt_4_1/ruby_lte_4_1/ruby_eq_4_1/ruby_gte_4_1/ruby_gt_4_1ruby_4_1/ruby_4_1_0(etc.)Motivation
Ruby 4.1 (ruby-head) introduces breaking changes in the Ruby C API that require conditional compilation in dependent crates. Specifically,
rb_data_type_struct__bindgen_ty_1replaced thereservedfield withhandle_weak_references.This change enables crates like
magnusto properly support both Ruby < 4.1 and Ruby >= 4.1.Testing
Closes #696