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"

tools/smokes/v2/lib/llvm_exe_runner.sh

@@ -11,6 +11,14 @@
 
 set -uo pipefail
 
+llvm_exe_cargo_target_dir() {
+  # Release builds can fail with EXDEV when rustc uses /tmp for temp files and target/ is elsewhere.
+  # Force a dedicated target dir under /tmp so rustc temp files and outputs stay on the same filesystem.
+  local target_dir="${LLVM_EXE_CARGO_TARGET_DIR:-/tmp/nyash_cargo_target}"
+  mkdir -p "$target_dir"
+  echo "$target_dir"
+}
+
 llvm_exe_preflight_or_skip() {
   if ! command -v llvm-config-18 &>/dev/null; then
     test_skip "llvm-config-18 not found"
@@ -27,6 +35,22 @@ llvm_exe_preflight_or_skip() {
     return 1
   fi
 
+  # Verify the binary can actually emit an object (not "mock LLVM").
+  # This avoids hard failures when hakorune was built without `--features llvm`.
+  local cargo_target_dir
+  cargo_target_dir="$(llvm_exe_cargo_target_dir)"
+  local preflight_obj="$cargo_target_dir/_llvm_exe_preflight.o"
+  rm -f "$preflight_obj"
+  if ! env NYASH_DISABLE_PLUGINS=1 NYASH_LLVM_USE_HARNESS=1 NYASH_LLVM_OBJ_OUT="$preflight_obj" \
+    "$NYASH_BIN" --backend llvm "$NYASH_ROOT/apps/tests/phase87_llvm_exe_min.hako" >/dev/null 2>&1; then
+    test_skip "LLVM object emit preflight failed (hakorune may lack --features llvm)"
+    return 1
+  fi
+  if [ ! -f "$preflight_obj" ]; then
+    test_skip "LLVM object emit unavailable (hakorune may be built without --features llvm)"
+    return 1
+  fi
+
   return 0
 }
 
@@ -92,8 +116,11 @@ llvm_exe_ensure_plugins_or_fail() {
   echo "$CHECK_OUTPUT"
   echo "[INFO] Missing/broken plugin detected, running build-all"
 
+  local cargo_target_dir
+  cargo_target_dir="$(llvm_exe_cargo_target_dir)"
+
   local build_log="${LLVM_PLUGIN_BUILD_LOG:-/tmp/llvm_exe_plugin_build.log}"
-  if ! bash "$NYASH_ROOT/tools/plugins/build-all.sh" "${crate_names[@]}" >"$build_log" 2>&1; then
+  if ! env CARGO_TARGET_DIR="$cargo_target_dir" bash "$NYASH_ROOT/tools/plugins/build-all.sh" "${crate_names[@]}" >"$build_log" 2>&1; then
     echo "[FAIL] tools/plugins/build-all.sh failed"
     tail -n 80 "$build_log"
     return 1
@@ -133,8 +160,17 @@ llvm_exe_build_and_run_numeric_smoke() {
 
   echo "[INFO] Building: $INPUT_HAKO → $OUTPUT_EXE"
 
+  local cargo_target_dir
+  cargo_target_dir="$(llvm_exe_cargo_target_dir)"
+
+  # Ensure we use the compiler binary built in that target dir.
+  local nyash_bin="$cargo_target_dir/release/hakorune"
+  local obj_out="$cargo_target_dir/aot_objects/$(basename "$INPUT_HAKO").o"
+  mkdir -p "$(dirname "$obj_out")"
+
   local build_log="${LLVM_BUILD_LOG:-/tmp/llvm_exe_build.log}"
-  if ! env NYASH_DISABLE_PLUGINS=0 "$NYASH_ROOT/tools/build_llvm.sh" "$INPUT_HAKO" -o "$OUTPUT_EXE" 2>&1 | tee "$build_log"; then
+  if ! env CARGO_TARGET_DIR="$cargo_target_dir" NYASH_BIN="$nyash_bin" NYASH_LLVM_OBJ_OUT="$obj_out" NYASH_DISABLE_PLUGINS=0 \
+    "$NYASH_ROOT/tools/build_llvm.sh" "$INPUT_HAKO" -o "$OUTPUT_EXE" 2>&1 | tee "$build_log"; then
     echo "[FAIL] build_llvm.sh failed"
     tail -n 80 "$build_log"
     return 1