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build(lite-backend): pin the SDXL backend to rustc 1.63 via rust-toolchain.toml

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The pinned librustzcash / transitive crates (notably traitobject 0.1.0) rely on
pre-1.70 trait coherence and fail to compile on newer rustc (E0119), so the backend
must build with 1.63. Add a rust-toolchain.toml in the vendored backend so rustup
auto-selects 1.63 when cargo runs there — no more manual RUSTUP_TOOLCHAIN=1.63.0.
The pin is scoped to the backend tree (repo-root cargo keeps the default toolchain).
Also symlink the pin into the prepared build root so --silentdragonxlitelib-dir
builds honor it too.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
DanS
2026-07-23 21:30:16 -05:00
parent 00ffc959e5
commit fffee9f0b5
2 changed files with 15 additions and 0 deletions
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3
scripts/build-lite-backend-artifact.sh
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@@ -324,6 +324,9 @@ prepare_backend_source() {
ln -s "$BACKEND_SOURCE_DIR/src" "$prepared_root/src"
[[ -f "$BACKEND_SOURCE_DIR/Cargo.lock" ]] && ln -s "$BACKEND_SOURCE_DIR/Cargo.lock" "$prepared_root/Cargo.lock"
[[ -d "$BACKEND_SOURCE_DIR/.cargo" ]] && ln -s "$BACKEND_SOURCE_DIR/.cargo" "$prepared_root/.cargo"
# Honor the pinned Rust toolchain (rust-toolchain.toml) inside the prepared root too,
# so builds using --silentdragonxlitelib-dir still select rustc 1.63.
[[ -f "$BACKEND_SOURCE_DIR/rust-toolchain.toml" ]] && ln -s "$BACKEND_SOURCE_DIR/rust-toolchain.toml" "$prepared_root/rust-toolchain.toml"
[[ -d "$BACKEND_SOURCE_DIR/libsodium-mingw" ]] && ln -s "$BACKEND_SOURCE_DIR/libsodium-mingw" "$prepared_root/libsodium-mingw"
# Vendored crate deps (offline builds): the .cargo/config.toml's vendored-sources directory is
# "vendor" relative to the build root, so expose it inside the prepared root too.