diff --git a/lib/core/Handles/HandlesAssign.py b/lib/core/Handles/HandlesAssign.py
index 6047f64..96953cc 100644
--- a/lib/core/Handles/HandlesAssign.py
+++ b/lib/core/Handles/HandlesAssign.py
@@ -1488,7 +1488,9 @@ class AssignHandle(BaseHandle):
                 # 应升级为 common 定义（多模块同名合并为零值，对齐 None 语义），
                 # 而非静默跳过。
                 existing_gv = Gen.module.globals.get(VarName) if VarName in Gen.module.globals else None
-                if isinstance(existing_gv, ir.GlobalVariable) and getattr(existing_gv, 'is_declaration', False):
+                # 注：llvmlite.ir.GlobalVariable 无 is_declaration 属性（binding 层才有），
+                # 声明/定义靠 initializer 区分：external 声明 initializer 恒为 None。
+                if isinstance(existing_gv, ir.GlobalVariable) and getattr(existing_gv, 'initializer', None) is None:
                     try:
                         existing_gv.linkage = 'common'
                         if Node.value is None or (isinstance(Node.value, ast.Constant) and Node.value.value is None):