test(smokes): make LLVM EXE runner skip when object emit unavailable

tools/build_llvm.sh

@@ -46,9 +46,13 @@ if ! command -v llvm-config-18 >/dev/null 2>&1; then
   exit 2
 fi
 
+# Use the cargo target dir when set (helps LLVM EXE smokes that build under /tmp).
+CARGO_TARGET_DIR_EFFECTIVE="${CARGO_TARGET_DIR:-$PWD/target}"
+
 echo "[1/4] Building hakorune (feature selectable) ..."
 # Select LLVM feature: default harness (llvm), or legacy inkwell when NYASH_LLVM_FEATURE=llvm-inkwell-legacy
 LLVM_FEATURE=${NYASH_LLVM_FEATURE:-llvm}
+
 # Use 24 threads for parallel build
 if [[ "$LLVM_FEATURE" == "llvm-inkwell-legacy" ]]; then
   # Legacy inkwell需要LLVM_SYS_180_PREFIX
@@ -135,7 +139,7 @@ echo "[3/4] Building Nyash Kernel static runtime ..."
 if [[ "${NYASH_LLVM_SKIP_NYRT_BUILD:-0}" == "1" ]]; then
   echo "    Skipping Nyash Kernel build (NYASH_LLVM_SKIP_NYRT_BUILD=1)"
 else
-  NYRT_LIB_PRIMARY="target/release/libnyash_kernel.a"
+  NYRT_LIB_PRIMARY="$CARGO_TARGET_DIR_EFFECTIVE/release/libnyash_kernel.a"
   NYRT_LIB_ALT="crates/nyash_kernel/target/release/libnyash_kernel.a"
   if [[ ( -f "$NYRT_LIB_PRIMARY" || -f "$NYRT_LIB_ALT" ) && "${NYASH_LLVM_FORCE_NYRT_BUILD:-0}" != "1" ]]; then
     echo "    Using cached Nyash Kernel runtime (set NYASH_LLVM_FORCE_NYRT_BUILD=1 to rebuild)"
@@ -149,7 +153,7 @@ fi
 mkdir -p "$(dirname "$OUT")"
 echo "[4/4] Linking $OUT ..."
 cc "$OBJ" \
-  -L target/release \
+  -L "$CARGO_TARGET_DIR_EFFECTIVE/release" \
   -L crates/nyash_kernel/target/release \
   -Wl,--whole-archive -lnyash_kernel -Wl,--no-whole-archive \
   -lpthread -ldl -lm -o "$OUT"