build: migrate to Zig 0.16.0#28
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- zig 0.16.0 via mise; minimum_zig_version 0.16.0 - vaxis 0.5.1 -> 0.6.0 (pulls uucode 0.2.0), clap 0.11.0 -> 0.12.0, zeit 0.6.0 -> v0.9.0, zig-toml -> 00c5715e — each the last revision supporting zig 0.16 (masters already require 0.17-dev) - build.zig: link/include APIs moved from Compile to root_module; zon parse via fromSliceAlloc; drop duplicate libgit2 config on the test step (it shares exe.root_module)
zig 0.16 threads an explicit std.Io through fs/time/process/net APIs. main now uses the std.process.Init entry convention (gpa, io, environ, args provided by start code) and stores io/environ in global_io.zig so the rest of the codebase — including mruby C callbacks that cannot take an io parameter — can access them. Unit tests fall back to the blocking single-threaded Io. global_io also provides getEnv/getEnvOwned replacing the removed std.process env APIs.
std.net was removed in zig 0.16. Hostname resolution now goes through std.Io.net.HostName.lookup draining an Io.Queue (capped at 16 results), replacing getAddressList; nameserver sockaddr conversion uses std.Io.Threaded.addressToPosix; the raw UDP DNS query keeps its behavior via libc std.c.socket/sendto/recv since the std.posix socket wrappers were also removed. Note: the system-resolver path previously used libc getaddrinfo; zig's own resolver reads /etc/resolv.conf and /etc/hosts directly, so mDNS (.local) and scoped-resolver setups may behave differently.
Mechanical migration of the removed/relocated 0.15 std APIs:
- std.fs.File/Dir/cwd -> std.Io.File/Dir with io threaded as first arg;
makePath -> createDirPath; readToEndAlloc/readAll/writeAll -> reader/
writeStreamingAll interfaces; stat fields (permissions, Timestamp)
- std.time sleep/timestamps and std.Thread sleep/Mutex/Condition ->
Io equivalents (lockUncancelable for the previously-infallible lock)
- std.process Child.init/run/EnvMap/ArgIterator -> process.spawn(io)/
run(gpa, io)/Environ.Map/Args.Iterator; lowercase Term/StdIo tags
- ArrayList .{} init -> .empty; ArrayList.writer -> Io.Writer.Allocating;
std.io.fixedBufferStream -> Io.Writer.fixed; json ObjectMap unmanaged
- GeneralPurposeAllocator -> DebugAllocator; crypto.random -> io.random
- posix isatty/waitpid/fchmod/fstatat removed -> Io/libc equivalents;
chown now passes -1 to preserve ids instead of stat'ing first (musl's
struct stat does not survive translate-c, and this drops a TOCTOU)
- CoreFoundation cImports consolidated into cf.zig with narrow includes
plus a _MACH_MESSAGE_H_ guard: 0.16 translate-c cannot handle the
mach_msg descriptor types pulled in by the umbrella header
- Io.Dir.setFileOwner is broken upstream in 0.16.0 (declared error set
narrower than the implementation's); link.zig uses libc fchownat
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Supersedes #27 (closed automatically when its stacked base branch was deleted after #26 merged; GitHub cannot reopen it). Content is identical — see #27 for the original description and green CI run.
Summary
Migrates the codebase from Zig 0.15.2 to 0.16.0. Also fixes CI:
macos-latestrunners now ship an Xcode whoselibSystem.tbdonly declaresarm64e-macos, which 0.15.2's linker cannot resolve; 0.16.0 handles it (this is why #26's checks were red on unmodified code).Commits
std.process.Initmain convention +src/global_io.zigprocess-wide Io accessorstd.Io.net.HostName.lookup(behavior note: zig's own resolver instead of libc getaddrinfo)std.Io, Writergate fallout, unmanaged containers, libc fallbacks (Io.Dir.setFileOwnerupstream bug, musl translate-c limits), CoreFoundation cImport consolidation with_MACH_MESSAGE_H_guardVerified
version+ fullprovisionrunprovision,node-info; host = macOS 26.5.1 + Xcode 26.6, no SDK workaroundsKnown behavior deltas
std.process.runforces stdin.ignoreon capture-and-wait helperschownhelpers pass-1to preserve ids (drops a TOCTOU)