Optimized macOS test build fails to link: native_sdk_update_verify_* undefined

[sepehr-safari]

zig build test -Doptimize=ReleaseFast fails on macOS for an app built with addAppArtifacts, and so does the model-contract tool:

error: undefined symbol: _native_sdk_update_verify_archive
    note: referenced by appkit_host.o: -[NativeSdkAppKitHost installDownloadedUpdate:version:archiveBytes:sha256:]_block_invoke
error: undefined symbol: _native_sdk_update_verify_feed
    note: referenced by appkit_host.o: -[NativeSdkAppKitHost checkForUpdatesUserInitiated:]_block_invoke

Debug links. Seen with CLI 0.10.1, Zig 0.16.0, on an Apple Silicon Mac; the code below is as of 6b05318 on main.

build/app.zig:2614 compiles src/platform/macos/appkit_host.m into the app module, so every binary built from it carries the host, the test binary included. The two functions are export fns in src/updater/c_api.zig (:14, :82), and the only thing that references them is the comptime block at src/platform/macos/root.zig:13. That file is only analysed when something reaches native_sdk.platform.macos, which the app runner's run path does and a test binary does not. A Debug link drops the unused host object; an optimized link keeps it, and the two symbols are missing.

A fix on the toolkit side could reference the two exports from wherever appkit_host.m is added, or from the module root on macOS, so they exist in every binary that carries the host. In the meantime an app can reference them itself, which is what I do in Plaza (zig-nostr/plaza#390):

comptime {
    if (builtin.os.tag == .macos) {
        _ = native_sdk.updater.c_api.native_sdk_update_verify_feed;
        _ = native_sdk.updater.c_api.native_sdk_update_verify_archive;
    }
}