odin-lang/Odin dev-2026-02

on GitHub

New Language Features

• #+feature using-stmt
  • using as a statement and procedure parameter modifier is now an opt-in feature on a per-file basis rather than on by default
  • using on struct fields still works
• struct #simple
  • force a struct to use simple comparison if all of the fields "nearly simply comparable"
  • This is a niche solution to a niche problem
  • "simply comparable" are types which can be compared with the equivalent of C's memcmp directly (e.g. integers, booleans, aggregates of them)
  • "nearly simply comparable" include the simply comparable types and floats, since floats have different rules for +0, -0, and NaN, and are NEARLY simply comparable if you don't care about those edge cases
  • This struct directive will force a struct to be "simply comparable" even if its fields would make it "nearly simply comparable"

New Compiler Improvements

• Link-Time Optimization Support
  • -lto:thin and -lto:thin-files
• #must_tail directive and preserve/none/preserve/most/preserve/all calling conventions
  • Enables the ability to state how optimize for tail calls
• -disable-unwind
• Improvements to the constant conversion checks
• intrinsics.count_leading_ones and intrinsics.count_trailing_ones
• Show -target flag usage example in help
• Numerous debug info fixes
• Static linking on non-Windows platforms
• Add warning for size_of(&x) as it will always be size_of(rawptr) and probably a typo
• -target:freestanding_amd64_mingw
  • Allowing for linking to MinGW on Windows but for freestanding purposes (not general)
• Fix string16 issues on Mac and Linux
• Fix in/not_in on constant bit_sets
• Allow #+vet tags always work in addition to command line flag
• General fixes to -vet
• Type assertions now use the same context.assertion_failure_proc as assert and panic where possible
• #+feature force-type-assert which overrides -no-type-assert on a per-file basis
• Fix numerous data races in the compiler frontend
• Fix numerous threading bugs in the compiler frontend

New Packages

• core:nbio
  • Non-Blocking IO
• core:container/handle_map
  • Utilizing core:container/xar for stable backing data

Package Improvements

• core:thread
  • Add init and fini callback procedures to thread pools
• core:crypto
  • Add initial support for short Weierstrass curves
  • General improvements and additions
• core:testing
  • Use Windows API for SIG handling on Windows
• core:image
  • Fix TGA header detections
  • .do_not_expand_grayscale for TGA
• core:os/core:os/os2
  • Fix lookup_env_buf
  • Fix truncate-clamp op order when determining to_read size
• core:encoding/base64
  • Add support URL variant
• core:encoding/entity
  • Update handling of 2-codepoint based entities
• core:encoding/xml
  • Correct how comment handling and entities
• core:strings
  • Add loc := #caller_location to allocating procedures that would benefit for it
• core:sys/windows
  • add a few procedure bindings
  • sync barriers
  • procedure-based "macros" for RawInput
• core:text/regex
  • Pass given allocator on in create_iterator
• vendor:x11/xlib
  • Binding fixes, correcting incorrect signatures
• vendor:directx
  • Improve string type uses in DirectX bindings
• vendor:compress/lz4
  • Fix linking on non-Windows platforms
• vendor:curl
  • Fix linking on all unix-like OSes
• vendor:sdl3
  • Add missing procedures GetGpueDeviceProperties
  • Fix signature of RenderTextureRotated
• vendor:sdl3/image
  • Update to 3.4.0
• Move vendor:libc to vendor:libc-shim
  • This is to clarify that it exists as a "shim" rather than a proper replacement
• Update Orca bindings
• General additions and improvements to core:sys/linux
• Bulk-write to a slice in xoshiro/pcg_random_generator_proc
• Fixes to darwin/Foundation bindings

Full Change Log

Full Changelog: dev-2026-01...dev-2026-02