diff --git a/lib/Projectrans/Phase2Translator.py b/lib/Projectrans/Phase2Translator.py
index 086edba..6f08132 100644
--- a/lib/Projectrans/Phase2Translator.py
+++ b/lib/Projectrans/Phase2Translator.py
@@ -302,20 +302,6 @@ class Phase2Translator:
                 sha1 = fname[:-8]
                 self.stub_files[sha1] = fpath
 
-        # 从全局缓存补充 temp_dir 中缺失的 .vpi / .stub.ll
-        if os.path.isdir(_GLOBAL_CACHE_DIR):
-            for fname in os.listdir(_GLOBAL_CACHE_DIR):
-                if fname.startswith('_'):
-                    continue
-                if fname.endswith('.vpi') or fname.endswith('.pyi'):
-                    sha1 = fname[:-4]
-                    if sha1 not in self.sig_files:
-                        self.sig_files[sha1] = os.path.join(_GLOBAL_CACHE_DIR, fname)
-                elif fname.endswith('.stub.ll'):
-                    sha1 = fname[:-8]
-                    if sha1 not in self.stub_files:
-                        self.stub_files[sha1] = os.path.join(_GLOBAL_CACHE_DIR, fname)
-
         # 从内存存储器读取 SHA1 映射（_sha1_map.txt 仅人类可读，不再作为机器数据源）
         # 延迟导入避免循环依赖（Config 导入 Phase2Translator）
         from lib.Projectrans.Config import get_sha1_map_store
@@ -331,6 +317,25 @@ class Phase2Translator:
             for sha1, stub_path in self.stub_files.items():
                 self.sha1_map[sha1] = sha1
 
+        # 从全局缓存补充 temp_dir 中缺失的 .vpi / .stub.ll。
+        # 只补充"当前编译有效"的 sha1（在 sha1_map 中）：.transpyc_cache 会残留
+        # 旧版源码的缓存（如旧 __builder.vp 的 9026a429f5e2d0e0.pyi/.stub.ll 与新
+        # d9b3d06934cd1898 共存），不加过滤会把旧版 .vpi/.stub.ll 也加载进
+        # sig_files/stub_files → 同名类（IRBuilder）按旧 sha1 前缀注册 →
+        # ld.lld undefined symbol: 9026a429f5e2d0e0.new_builder。
+        if os.path.isdir(_GLOBAL_CACHE_DIR):
+            for fname in os.listdir(_GLOBAL_CACHE_DIR):
+                if fname.startswith('_'):
+                    continue
+                if fname.endswith('.vpi') or fname.endswith('.pyi'):
+                    sha1 = fname[:-4]
+                    if sha1 in self.sha1_map and sha1 not in self.sig_files:
+                        self.sig_files[sha1] = os.path.join(_GLOBAL_CACHE_DIR, fname)
+                elif fname.endswith('.stub.ll'):
+                    sha1 = fname[:-8]
+                    if sha1 in self.sha1_map and sha1 not in self.stub_files:
+                        self.stub_files[sha1] = os.path.join(_GLOBAL_CACHE_DIR, fname)
+
     def _build_struct_sha1_map(self) -> dict[str, str]:
         struct_sha1_map = {}
         valid_sha1_keys = set(self.sha1_map.keys())