build.bat: install rustup targets for pinned toolchain#415
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After #399 pinned the local Rust toolchain to 1.93 via src/rust-toolchain.toml, `build.bat --all` started failing for developers whose 1.93 install only has the host target's stdlib — rustup auto-downloads the pinned channel on first cargo invocation from src/, but only for the host triple, so the cross-target build (aarch64 from x86_64 hosts, or vice versa) fails with a missing stdlib. Mirror the fix already in build-mac.sh (lines 87-92): before running cargo, gate on `where rustup` and `rustup target add` each requested triple inside src/ so the pin applies. Output is silenced and errors swallowed — if rustup itself can't add the target, the subsequent `cargo build` will produce the real diagnostic. build.sh on Linux doesn't need this because it builds for the host target without --target, which rustup's channel auto-install already covers. Verified: `build.bat --all` now builds both x86_64-pc-windows-msvc and aarch64-pc-windows-msvc cleanly on a host with only the native target previously installed under 1.93.
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Summary
rustup target addfix frombuild-mac.sh(lines 87-92) intobuild.batsobuild.bat --allworks for developers whose 1.93 install (pinned in Pin Rust toolchain to match CI (1.93) #399) only includes the host target's stdlib.aarch64-pc-windows-msvcfrom x86_64 hosts, or vice versa) were failing becauserustupauto-downloads the pinned channel for the host triple only — the cross-target stdlib still needs an explicitrustup target add.where rustup; output silenced; errors swallowed so a missing target falls through to a realcargo builddiagnostic rather than a vague rustup one.build.shdoesn't need the equivalent — it builds without--targetso the host-channel auto-install is sufficient.Test plan
build.bat --allfrom a clean state with only the native target installed under 1.93 — bothx86_64-pc-windows-msvcandaarch64-pc-windows-msvccompile, exit 0.Microsoft Reviewers: Open in CodeFlow