Prepare App Store 1.0 build 4

apple/build_rust_core.bash

@@ -2,9 +2,6 @@
 set -euo pipefail
 
 export CARGO_TARGET_DIR="$DERIVED_FILE_DIR/cargo"
-export RUSTC="$(rustup which --toolchain stable rustc)"
-export RUSTDOC="$(rustup which --toolchain stable rustdoc)"
-
 if [[ "$CONFIGURATION" == "Debug" ]]; then
     profile=debug
 else
@@ -21,10 +18,16 @@ fi
 
 libraries=()
 for arch in $ARCHS; do
+    toolchain=stable
+    cargo_args=(--locked)
     if [[ "$package" == "ironstorage-watch-apple" && "$arch" == "arm64" && "${LLVM_TARGET_TRIPLE_SUFFIX:-}" == "-simulator" ]]; then
         target=aarch64-apple-watchos-sim
     elif [[ "$package" == "ironstorage-watch-apple" && "$arch" == "arm64" ]]; then
         target=aarch64-apple-watchos
+    elif [[ "$package" == "ironstorage-watch-apple" && "$arch" == "arm64_32" ]]; then
+        target=arm64_32-apple-watchos
+        toolchain=nightly
+        cargo_args=(-Z build-std=std,panic_abort --locked)
     elif [[ "$package" == "ironstorage-watch-apple" && "$arch" == "x86_64" ]]; then
         target=x86_64-apple-watchos-sim
     elif [[ "$arch" == "arm64" && "${LLVM_TARGET_TRIPLE_SUFFIX:-}" == "-simulator" ]]; then
@@ -38,11 +41,13 @@ for arch in $ARCHS; do
         exit 1
     fi
 
+    export RUSTC="$(rustup which --toolchain "$toolchain" rustc)"
+    export RUSTDOC="$(rustup which --toolchain "$toolchain" rustdoc)"
     if [[ "$profile" == "debug" ]]; then
-        rustup run stable cargo build --locked \
+        rustup run "$toolchain" cargo build "${cargo_args[@]}" \
             --target "$target" --package "$package" --lib
     else
-        rustup run stable cargo build --locked --release \
+        rustup run "$toolchain" cargo build "${cargo_args[@]}" --release \
             --target "$target" --package "$package" --lib
     fi
     libraries+=("$CARGO_TARGET_DIR/$target/$profile/lib$library.a")