Zig 0.17.0 Release Notes

Zig 0.17.0 ships after five months of work from 206 contributors across 925 commits, headlined by a reworked Build System (including a new Build Server Protocol), an enhanced ELF linker that now supports incremental compilation for most x86_64-linux projects, and an upgrade to LLVM 22.1.8. The release introduces numerous breaking changes: @bitCast semantics for arrays/vectors changed in a way that can silently break code without a compile error, @cImport is removed, errdefer captures are removed, void{} syntax is removed, array multiplication syntax is replaced by @splat, and many std library APIs were renamed or deprecated (std.builtin to std.lang, DebugAllocator replaced, bit_set types renamed, Uri/HostName split). New builtins include @backingInt, @fromBackingInt, @SpirvType, and @divCeil. Target support was expanded (loongarch32, xtensa-linux, sparc64-linux via new linker) while some PowerPC/glibc combinations lost support due to long-double format formalization. ZLS currently cannot work with 0.17.0 due to the maker/configurer process split, though the Zig and ZLS teams are collaborating on fixes.

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