dev-2026-01

New Language Features

New Compiler Improvements

• Undetected type declaration cycles work-around
• Fix misleading error messages for init, fini and test attributes
• Fix automatic objc_msgSend on static methods via selector expression not resolving aliased types
• Fix #packed #all_or_none
• Fix auto objc_msgSend incorrectly treating certain class methods as instance methods.
• Fix handling of #force_inline
• Fix literal endianness

New Packages

• core:container/xar, an Odin-native implementation of an Exponential Array

Package Improvements

• Fix duplicate jpeg.load on JS
• Added more NSApplication and NSWindow bindings
• Update kb_text_shape to v2.03
• Fix default temp allocator underflow bug
• SDL2: Use multi-pointer so you can pass array
• Fix function signature for memmove in vendor:libc
• Freebsd: Fixed 'write' syscall to cause 'ESPIPE' on the pipe fd
• Update Box2d to 3.1.1
• Fix core:debug/trace example
• Make linux.IO_Vec.base a multipointer
• Ensure libc is linked on Windows for vendor:compress/lz4
• Change Return Type of sdl2.GetWindowFlags from u32 to Existing WindowFlags bit_set
• Fix minor issues within curl bindings
• core:time/timezone added additional search paths to match musl
• More bindings for Darwin
• Add @builtin to missing builtin procedure group procs
• os/os2: fix stale errors on windows when reading from console
• os/os2: better fix for the stale errors
• Fix runtime.print_i64 using an OOB index when min(i64) is given.
• os/os2: use ReadFile for Console reads too, at least for now
• core:sys/linux Add timerfd syscall wrappers
• Fix nfds_t alias for Linux
• core:io/utils: fix buffer size in write_* procs
• core:net docs: recv of 0 bytes with no error is a graceful close
• core:math/rand small documentation fix
• Address issue identifying CDATA in XML file
• encoding/base32: Fix padding validation for malformed input
• Fix standard json parsing / unmarshalling issue for pure arrays
• Add user32 scroll bar related bindings, and FrameRect
• Add missing 'caller_location' to several procedures in 'slice' package
• Update letter.odin
• WebGL binding additions
• Add JSON5/SJSON Comments When Marshalling
• Fix Unicode Output When Marshalling JSON
• Allow Unmarshalling to rune
• Custom json (un)marshalling, similar to core:fmt's custom formatters
• Fix net.map_to_ip6 offset
• [vendor/sdl3] update to sdl 3.4.0

Other

• Fix NetBSD CI by @krnowak in #6080

Full Changelog: dev-2025-12a...dev-2026-01

dev-2025-12a

New Language Features

New Compiler Improvements

• Fix duplicate code emission in type assertions.

New Packages

Package Improvements

• core:os/os2: Fix #5873
• Replace cURL library for Windows with one built against msvcrt
• Update cURL bindings to 8.17

Full Changelog: dev-2025-12...dev-2025-12a

dev-2025-12

Breaking changes

• BREAKING: Use chacha8rand as the default RNG.

The old default generator is available under core:math/rand in rand_pcg.odin in case you require a seed to return the same sequence as before.

New Language Features

• Introduce #all_or_none for structs, which requires that struct literals have all or none of the fields set

New Compiler Improvements

• Use SIP hash as name canonicalization hash
• Moved checking of -vet-unused-procedures and -vet-packages flags to after all flags are parsed
• Fixes for 32 bit with regards to typeid
• Fix #5894
• Remove #no_copy
• Don't check proc signature similarity for imported Objective-C methods
• Ubuntu arm ci and posix fixes
• Fix allocation of anonymous globals
• Fix #5967: Incorrect stack overflow warning for by ref switches over unions
• Skip collision panic when package names aren't unique

New Packages

• Add vendor:curl

Package Improvements

• Improve docs for stable sort procedures
• Fix: linalg.quaternion_from_forward_and_up
• Clone unquoted strings in encoding/json
• Add missing SetLayeredWindowAttributes
• Add io uring API
• Add FreeLibraryAndExitThread in kernel32. Add EnumProcessModules in psapi
• Fix typo in NS.String_initWithCString
• Remove the Darwin-specific paths from thread_unix
• Fix thread_act_t size
• Fix: make choice_bit_set respect bit_set domain
• math/rand: Add range-based number generation procedures
• Fix is_pointer_internally not handling Named Types
• Faster big.itoa
• Add Xoshiro256 RNG
• Add LockFileEx/UnlockFileEx and related flags
• Fix vendor:stb/image resize alpha_channel parameter type to c.int
• Move some OS General_Error values to io.Error
• Fix out of bounds access when parsing end_pos
• Add WSASendTo and WSARecvFrom
• Update d3d12 bindings for D3D12_FEATURE_D3D12_TIGHT_ALIGNMENT
• Add NSWindow coordinate space conversion bindings
• Don't build log allocator file on freestanding targets
• Adjust docs links for satellite SDL libraries
• Increase base64 decoding table size to 256, preventing out of bounds reads
• vendor/xlib: a few more IM-related procedures and constants
• add math.sign and math.sign_bit overloads for int types
• Implement more Linux syscalls
• Add SIO_UDP_CONNRESET winsock constant
• os2.File_Stream

Other

• Fix up macOS CI

Full Changelog: dev-2025-11...dev-2025-12

dev-2025-11

Licensing Changes

• Change Odin's LICENSE to zlib from BSD 3-clause

New Language Features

• intrinsics.concatenate
  • Concatentation of constant slices, strings, and some arrays at compile time
• intrinsics.objc_super & @(objc_superclass=<type>)

New Compiler Improvements

• Objective-C interface improvements
  • intrinsics.objc_super and automatically emit objc_msgSend calls where necessary for @(objc_superclass) attribute
  • Fix block symbols naming conflict across modules
• LLVM backend fixes
  • #simd vector only uses bit cast when elements are not pointers
  • Fix bitcasting context pointer to prevent compilation errors on LLVM-14
  • Numerous constant union improvements
  • Prefer the Type * ver LLVMTypeRef when looking up struct_field_remapping due to lack of uniqueness
• Default parameter exclusion counting improvement for procedure groups
• Improved -target-features flag by allow the user to disable a target feature
  • -target-features:-sse,-sse2,-avx
• -export-linked-libs-file:<string> flag to export the linked libraries to a file
• Fix a few compiler hangs on macOS.
• LLVM 21 support for non-Windows platforms
• Fix: #load alignment bug
  • set minimum alignment to 16-bytes
• Fix orca linking path
• Add #subtype/using to name canonicalization rules
• Numerous frontend bugs fixed

New Packages

Package Improvements

• More documentation improvements across the core library
• General improvements and more documentation for core:os/os2
• Add inject_at_soa and append_nothing_soa
• vendor:wgpu update to 27.0.2.0
• core:unicode/utf8: Add Grapheme_Iterator
• New slice.sort implementation to allow for better code generation and general API
• Deprecate the C style procedures in strconv (e.g. iota, atoi, etc`)
• WASM: Fix odin.js undefined this.mem
• Fix sRGB <-> linear RGB conversion
• core:encoding/json fixes
  • Fix null parsing in certain cases
• core:encoding/cbor: Fix epoch tag with small values
• core:container/rbtree add find_or_insert
• Fix bindings generator for vendor:vulkan for extensions and ~0 style constants
• Disable bounds checking where appropriate for Unicode and UTF-8 procedures
• vendor:fontstash: Fix crash with .TTC files
• core:simd : Fix incorrectly named calls in bit_not
• vendor:sdl3: Add PointInRectFloat
• vendor/egl
  • add a few more procedures and constants
  • Fix GetPlatformDisplay and CreatePlatformWindowSurface to use int instead of i32
• vendor:box2d
  • fixes to bindings mismatches
  • Add targetAngle to RevoluteJoint struct/procs
• core:odin/parser
  • fixes for end_pos
  • parse empty identifiers after selector as a selector expression with an empty field
• core:hash: add CCITT CRC-16
• Make packed conditional on EPoll_Event to match kernel
• core:math/linalg/hlsl: support half types
• core:math/ease: Add inverse ease procedures
• vendor:raylib: add MAX_MATERIAL_MAPS constant
• core:sys/darwin/Foundation: add additional AppKit bindings
• core:text/scanner allow for octal prefix style parsing for C-style ints

Full Changelog: dev-2025-10...dev-2025-11

dev-2025-10

New Language Features

New Compiler Improvements

• Improve type inferencing of literals when calling proc groups
• Windows i386 support
• Fix Darwin addObserver methods and add support for new Objc_Block
• Fix segfault involving string_to_string16 on Linux
• Improve OSX threading performance
• Basic support for constant union literals
• Add -build-diagnostics
• Prevent returning a struct containing compound literal slice
• Relax signature_parameter_similar_enough on struct params and fix various foreign signatures
• Preempt field checking on signature_parameter_similar_enough with a type ptr equality check
• Remove stray debug printf

New Packages

• [core/image]: Add baseline JPEG support

Package Improvements

• Use .Image_Dimensions_Too_Large in core:image
• tick_now: Use f64 (was f32) as a return type of odin_env.tick_now()
• Allow missing trailing comma with proc groups in core:odin parser
• Fix incorrect json encoding for control characters < 32
• Initializing big.Int constants is now "contextless"
• Add CancelIoEx and other overlapped I/O functions.
• Add missing caller location param to append in strings.Builder
• Add "contextless" to small_array get_safe and get_ptr_safe
• Zero small_array resize
• Unify filepath.join return between Unix/Windows
• Fix out-of-band allocations in dynamic arenas by
• Fix for temp_file name prefix being deallocated before being used
• Add runtime.conditional_mem_zero to improve heap_allocator performance on non-Windows systems
• Add digit_to_int to core:strconv
• Remove inaccurate tprint comment

Full Changelog: dev-2025-09...dev-2025-10

dev-2025-09

New Language Features

• Native support for UTF-16 strings: string16 and cstring16
  • Mostly for interfacing with Windows code, and other foreign code
• Define Integer Division By Zero #5556

New Compiler Improvements

• @(init) and @(fini) must be proc "contextless" ()
• Implement intrinsics.objc_block @harold-b in #5547
  • Implements the Apple block ABI.2010.3.16 natively
• Improve deference missing suggestion message
• Do not check for explicit allocators when determining proc in proc group by @janga-perlind in #5564
• Skip errors on polymorphic procs when in a proc group with other options
• Fix compiler segfault when trying to use proc at type level or trying to use () as a type

New Packages

Package Improvements

• Fixes to vendor:darwin/Metal
• Numerous minor fixes to base:runtime
• Improvements to base:runtime docs
• Fixes to vendor:wasm/WebGL bindings
• Cleanup in math/rand and runtime/random_generator
• Add missing xlib functions for getting and setting text properties
• vendor:OpenGL fix misnamed parameter by
• Make D3D12_FEATURE_DATA_D3D12_OPTIONS.MinPrecisionSupport a bitset
• Fix buddy allocator assert
• Check for EOF when scanning file tags
• Fix stride in memory_equal/compare_zero giving false positves
• Split SDL_ttf bindings to group with and without require_results
• Propogate #caller_location to core:container/queue procs
• Support using allocator resize in _reserve_soa
• Zero existing memory when using resize_soa
• Add add/remove_document_event_listener() to core:sys/wasm/js
• Fixed and added obj-c methods for NSWindow
• fix typo in CLSIDFromProgIDEx signature
• Fix broken wglUseFontBitmaps binding
• Add LPFN_GETACCEPTEXSOCKADDRS to ws2_32.odin
• Specify %m and %M as verbs for integer formatting in core:fmt
• Add @(require_results) attribute to procs returning an allocator
• Handle allocator error when appending in read_entire_file_from_file
• vendor:box2d fix CreateMotorJoint procedure signature
• Add build tags to posix/spawn.odin

Full Changelog: dev-2025-08...dev-2025-09

dev-2025-08

New Language Features

New Compiler Improvements

• General compiler bug fixes
• intrinsics.type_enum_is_contiguous
• intrinsics.simd_runtime_swizzle
• Add iOS and iPhoneSimulator subtargets for -target:darwin
• Fix @(objc_implement) methods not respecting @(objc_is_class_method)
• @(objc_name) attribute be inferrable
• Add Did you mean? for card/len
• #+vet explicit-allocators
• Saner stack linker flags for WASM
• Fix macos amd64 builds
• amd64 ABI fixes regarding certain types of SIMD vectors

New Packages

Package Improvements

• Update core:prof/spall to version 3
  • Adds @(no_instrumentation) to spall buffer and SCOPED operations
• core:hash/xxhash: Static SIMD Support for XXH3
• Minor fixes to core:mem/virtual edge cases
• Unix build script for kb_text_shape
• Add IUnknown UUID for win32 related code
• crypto/hash: hash_bytes_to_buffer slice result to digest size
• Minor fix to -default-to-nil-allocator
• Disable filepath/match.odin and filepath/walk.odin compilation on js targets
• Minor fixes to SDL_image save procedure that should return a boolean
• Mach Process Control
• Fix amd64 no-crt entry assembly
• Add cgltf filter type and wrap mode enums
• SDL2 - AudioAllowChangeFlags bit_set
• core:thread - set stack size to rlimit for *nix platforms

Full Changelog: dev-2025-07...dev-2025-08

dev-2025-07

New Language Features

• Add intrinsics.type_is_bit_field
• Add @(no_sanitize_memory) with additions to base:sanitizer

New Compiler Improvements

• Correct spelling in odin doc -help output
• Let -test-all-packages work with -build-mode:test
• Fix package docs
• Fix swizzle in for in statement
• Fix divti3 not being exported
• Fix scope attribute proc grouping
• Forbid multiple uses of -sanitize
• -vet-style: Be strict with type switch case column alignment
• Let compound literal array be broadcast to a struct field of arrays
• Packages with .odin in the name no longer attempt to parse as odin files
• Let -no-entry-point work for Windows DLLs
• Guard against invalid proc types in parameter list
• Push context onto stack before evaluating procedure parameters
• Consider custom #align when determining union tag size
• Ensure volatile status for all atomic operations
• Fix WASM C ABI for raw unions
• Fix invalid selector for acceleration structure
• Fix check_shift
• Forbid nested declaration of instrumentation procedures
• Fix bug where compiler treated uint enums as ints
• Fix load type panic because front-end allows a deref of a type
• Added options to show, obfuscate, trim, and hide source code locations
• Various fixes

New Packages

• vendor/kb_text_shape

Package Improvements

• Add examples/all/sdl3 for all sdl3 dependant packages
• Rewrite Atomic_RW_Mutex
• Add overlapped I/O bindings for Windows
• Allow odin check examples/all for js_wasm target
• Guard against negative index in inject_at
• Print timings to stderr instead of stdout
• Change os2.user_* on Windows to use SHGetKnownFolderPath
• Add core:os/os2 user dirs helper to retrieve common paths like Downloads, Videos, et al
• Clarify strconv.append_* to strconv.write_*
• Remove old @(deprecated) things.
• DXC: Fixed broken bindings of ICompiler and ICompiler2
• Fix GMT+/- timezone handling
• Clarify core:flags variadic behaviors
• Move core:math/bìg tests over to core:testing instead of using Python3 as an oracle
• Add initial tests for big rationals
• Sync chan refactor
• Replace core:posix usage in core:os/os2
• compat allocator improvements
• Fix pool_join hangs if no threads are started
• Fix early join after start
• Expose getpeername in core:net package as peer_endpoint
• Let tests expect assertion failures and signals raised
• Get env buffer
• Allow core:net to be imported with -default-to-panic-allocator
• Update vendor:sdl3 from 3.2.10 to 3.2.16, and vendor:sdl3/image from 3.2.0 to 3.2.4
• More Buddy_Allocator safeguards
• Fix RegEx docs
• Added TIOCGWINSZ to darwin, linux and freebsd
• Escape object file paths properly during linker_stage
• Fix try_send and send
• Added IS_SUPPORTED to core:sys/posix
• Fix issue parsing vendor/stb/image with the core:odin/parser parser
• Fix memory leak in core:math/big.internal_rat_norm
• raylib: Refer to Odin-style enum over original C enum
• sys/linux: Unify IPC_Flags and IPC_Mode bit_sets
• testing: Make test state changes its own feature
• Add slice.suffix_length
• Various fixes

Full Changelog: dev-2025-06...dev-2025-07

dev-2025-06

New Language Features

New Compiler Improvements

• Improvements to building with Android
• Add more asan support to the odin runtime and sanitizing for various allocators
• Fix to compile-time and variable NaN comparisons
• Fix to syscalls on NetBSD ARM64
• Fix Darwin version reporting on older macOS versions
• General compiler bug fixes
• intrinsics.type_elem_type(simd_vector)
• Fix Global/Static Variable Alignment
• Fixes assigning null as a type if it's an alias but the base type is null
• @(no_sanitize_address)
• Support Objective-C class implementation
• Add debug info for labels to Odin
• intrinsics.type_integer_to_unsigned and intrinsics.type_integer_to_signed
• Use --sysroot instead of -Wl,-syslibroot on Darwin
• Fix global and static any usage
• Re-enable static map calls on AMD64 SysV due to ABI fixes
• Make odin help more precise
• -dynamic-literals
• Do not call disabled deferred procedures
• Add /usr/local/lib to FreeBSD linker path
• Add error with a suggestion when trying to extract an element from a #simd array, and prefer simd.extract
• Only trim .odin from build filename
• Keep shared libraries from calling main program's startup/cleanup procs on Linux
• Add -build-only, -keep-test-executable, delete test executable after running
• Enable all sanitizers on FreeBSD
• RAD Debugger support through custom .raddbg section
  • Default views for slices and matrices
• Error on unterminated multi-line comment
• Fix output of object names (#5241)
• Add suggestions for quaternionN or complexN conversions

New Packages

• base:sanitizer
• vendor:windows/XAudio2
• vendor:sdl3/ttf
• core:terminal
• core:encoding/ansi -> core:terminal/ansi

Package Improvements

• Vectorize base:runtime.memory_*
• core:net
  • Rework errors to be cross-platform
  • Replace default_tcp_options with a constant
• core:container/small_array: Improve documentation for
• core:sync/chan: Improve documentation
• core:mem/tlsf: refactor, add free_all support, add automatic new pools
• core:fmt: Fix printing for bit_set[Enum] when min(Enum) != 0
• vendor/glfw
  • fix SetMonitorCallback and MonitorProc type definition
  • use b32 where appropriate
• core:text/regex: Add iterator
• core:math: Fix math.nextafter skipping from 0 to 1
• vendor:wgpu:
  • Update to 25.0.2.1
  • Fix function name for wgpu.js genericGetAdapterInfo
  • Correct mipmpaFilter field name in wgpu.js
• core:time/timezone: preserve nanoseconds on calls
• vendor:box2d:
  • Update to 3.1.0
  • Add missing field in box2d.BodyDef
  • Make build_box2d.sh more flexible
• core:container/priority_queue
  • let it return runtime.Allocator_Error
  • Fix off-by-one error in remove
• core:sys/darwin/Foundation : Loads of additions and related stuff
• vendor:sdl2: correct RWwrite signature
• vendor:sdl3:
  • Fix count output parameter of GetFullscreenDisplayModes
  • Add Semaphore API
• core:encoding/*, fix parsing of CDATA tags
• core:time: add tick_add
• core:encoding/cbor, fix slice overflow
• core:os/os2: general improvements
• vendor:wasm/WebGL: Fix incorrect parameter types
• core:bufio: Fix typo from b.w-b.w to b.w-b.r
• core:simd/x86: BMI/BMI2 intrinsics
• base:intrinsics: alternate reduce_add/reduce_mul intrinsics
• core:strconv, add support for hex-floats (0h)
• vendor:raylib/rlgl add some missing functions
• vendor:directx/d3d12
  • add more FEATURE_DATA_OPTIONs
  • Fix RESOURCE_STATE_ALL_SHADER_RESOURCE flags and add new HEAP_TYPE
• core:encoding/json: when unmarshalling, only match on struct tags if present
• vendor/miniaudio: update to 0.11.22
• core:math/big: fix range check in int_atoi
• Add comments to builtin.odin, documenting ODIN_* constants
• vendor:windows/GameInput: fixes and tweaks
• core:encoding/csv: Fix incorrect CSV reader settings for example
• Vectorize strings.prefix_length

Full Changelog: dev-2025-04...dev-2025-06

dev-2025-04

New Language Features

New Compiler Improvements

• Support LLVM 20.1
• Fix Objective-C Selector and Class linking problems caused by a race condition
• VERY Rudimentary support for Android:
  • -subtarget:android for -target:linux_arm64
• Numerous js_wasm32 improvements
• Add ~{memory} clobber to syscalls intrinsics
• Improve or_else type inference logic
• Use Microsoft's "best practices" for using vswhere
• General Bug Fixes which caused compiler crashes

New Packages

Package Improvements

• Update vendor:sdl3 to 3.2.10
• core:crypto
  • General improvements
• core:os/os2/path.odin rewrite from scratch
  • Improved Documentation
  • Remove dependency on core:path/filepath