ios: `native dev --target ios` fails to link — zig-built archive members not 8-byte aligned for Apple ld

[donpark]

An embed static library built by the iOS dev loop is rejected by Xcode's linker before the app can ever run: native dev --target ios fails on every TypeScript-core app at the host-compile step, with a low-level ld error about archive member alignment. The zig build lib step itself succeeds; the failure happens when the toolkit-owned UIKit host is linked against the archive it just produced.

Repro

native init demo && cd demo
native dev --target ios

Expected: the embed library builds, the UIKit host compiles and links, the app installs and launches in the simulator.

Actual:

native dev (ios): compiling the toolkit UIKit host
ld: 64-bit mach-o member 'libIdfon_zcu.o' not 8-byte aligned in '.native/embed/aarch64-ios-simulator/lib/libIdfon.a'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
native (ios): `xcrun` step failed

Modern ld64 requires 64-bit mach-o archive members to be 8-byte aligned; the archive zig emits doesn't guarantee that. Xcode 26.6's ld enforces it.

Workaround

Extract the members and repack with libtool before the link:

mkdir repack && cd repack
xcrun ar x ../libIdfon.a
chmod 644 *.o          # members extract with mode 000
rm -f __.SYMDEF*
xcrun libtool -static -o ../libIdfon-aligned.a *.o

Gotcha for the fix: repacking from the archive directly (libtool -static -o out.a in.a) is not equivalent — it silently drops members, and the linked app then fails with all 48 _native_sdk_app_* C-API symbols undefined. Members must be extracted first, then repacked from the individual .o files. Worth an assertion after any repack (nm -g still finds _native_sdk_app_create).

Environment

• native 0.10.1 (064ca98), CLI reports native 0.10.1 (commit 064ca98, automation protocol 0x51f7889bbe3305e7)
• macOS 26.6.2 (arm64), Xcode 26.6
• Zig 0.16.0, Node v24.20.0

Notes

• Fix lives in src/tooling/ios.zig (and the xcodeproj packaging path): repack the embed archive after buildEmbedLib, before the clang link. Cheap relative to the build.
• The alignment failure and the UBSan failure (sibling issue) are independent — fixing one does not unblock native dev --target ios; both must be fixed for the dev loop to complete.