usb: build the full KVM composite surface

scripts/build-cross.sh

@@ -40,8 +40,26 @@ export SOUVERAINE_AARCH64_SYSROOT="$SYSROOT"
 export SOUVERAINE_AARCH64_LINKER_SCRIPTS="$LINKER_SCRIPTS"
 export CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER="$PWD/scripts/aarch64-linker"
 
+BIN_NAME=souveraine
+EXPECT_BIN_NAME=false
+for arg in "$@"; do
+    if $EXPECT_BIN_NAME; then
+        BIN_NAME="$arg"
+        EXPECT_BIN_NAME=false
+        continue
+    fi
+    case "$arg" in
+        --bin) EXPECT_BIN_NAME=true ;;
+        --bin=*) BIN_NAME="${arg#--bin=}" ;;
+    esac
+done
+
 cargo build --release --target aarch64-unknown-linux-gnu "$@"
 
-BIN="$TARGET_DIR/aarch64-unknown-linux-gnu/release/souveraine"
+BIN="$TARGET_DIR/aarch64-unknown-linux-gnu/release/$BIN_NAME"
+[[ -x "$BIN" ]] || {
+    echo "requested build produced no executable: $BIN" >&2
+    exit 1
+}
 echo "== built: $BIN =="
 file "$BIN"