The openclaw-mlx-tts voice helper pulls in the full mlx-swift Metal shader
stack, which some beta Xcode toolchains (e.g. Xcode 27 / macOS 27 SDK) cannot
compile: the metal compiler dies non-deterministically (a different .metal file
each run, 'Could not read serialized diagnostics file'). The main app builds
fine, so an unrelated dev/proof build should not be blocked by the helper.
Add OPENCLAW_SKIP_MLX_TTS=1 (matching the sibling SKIP_TSC/SKIP_UI_BUILD
toggles) to package the app without the voice helper, gating both the per-arch
build and the bundle copy. Refuse the flag for release builds, which must ship
the helper (notarization verifies it), so a skipped build can never become a
silently incomplete release.
Peter Steinberger
f87580ceb8
