diff --git a/lib/Projectrans/Phase2Translator.py b/lib/Projectrans/Phase2Translator.py
index 1890225..6eeaf29 100644
--- a/lib/Projectrans/Phase2Translator.py
+++ b/lib/Projectrans/Phase2Translator.py
@@ -501,6 +501,65 @@ def _count_braces_outside_strings(text: str) -> int:
     return count
 
 
+def _AddWeakComdat(ll_content: str) -> str:
+    """为 weak/linkonce 系列 函数/全局 定义补 COMDAT（COFF/PE 必需）。
+
+    COFF 下无 COMDAT 的 weak/linkonce 定义会被 llc 展开成强符号
+    `.weak.<name>.default`（weak external 的实现副本）。同一弱定义出现在
+    多个模块时（泛型特化方法如 `e94ef9e139461915.list[rowptr[AST]].
+    __before_init__`、跨模块共享常量如 PYI_BUF_SIZE），副本同名 →
+    ld.lld 报 duplicate symbol。补 COMDAT(any) 后 llc 输出单一 COMDAT
+    成员，链接器自动去重（llc/ld.lld 端到端已实验验证）。
+    """
+    if (' linkonce ' not in ll_content and ' linkonce_odr ' not in ll_content
+            and ' weak_odr ' not in ll_content and ' weak ' not in ll_content):
+        return ll_content
+    weak_links = 'linkonce|linkonce_odr|weak|weak_odr|extern_weak'
+    comdat_names: list[str] = []
+
+    # 1) 函数定义：define <linkage> [dso_local] ... @name(...) { → @name(...) comdat {
+    def _fn_repl(m: re.Match) -> str:
+        comdat_names.append(m.group(3))
+        return m.group(1) + ' comdat ' + m.group(4)
+    ll_content = re.sub(
+        r'^(define\s+(?:dso_local\s+)?(?:%s)\s+[^@]*@("?)([^"\s\(]+)\2[^{]*)(\{)' % weak_links,
+        _fn_repl, ll_content, flags=re.MULTILINE)
+
+    # 2) 全局定义：@name = <linkage> [dso_local] (global|constant) <init> → 值后补 ', comdat'
+    #    （comdat 需位于 align/section 等尾部属性之前，符合 LLVM IR 文法）
+    def _g_repl(m: re.Match) -> str:
+        line = m.group(0)
+        if ' comdat' in line:
+            return line
+        comdat_names.append(m.group(3))
+        ins = re.search(r',\s*(?:align|section|partition|code_model)\b', line)
+        if ins:
+            return line[:ins.start()] + ', comdat' + line[ins.start():]
+        return line + ', comdat'
+    ll_content = re.sub(
+        r'^(@("?)([^"=\s]+)\2\s*=\s*(?:%s)\s+(?:dso_local\s+)?(?:global|constant)[^\n]*)' % weak_links,
+        _g_repl, ll_content, flags=re.MULTILINE)
+
+    if not comdat_names:
+        return ll_content
+    decls: list[str] = []
+    for name in dict.fromkeys(comdat_names):
+        if re.match(r'^[0-9A-Za-z_$.-]+$', name):
+            decls.append(f'${name} = comdat any')
+        else:
+            decls.append(f'$"{name}" = comdat any')
+    comdat_block = '\n'.join(decls) + '\n'
+    lines = ll_content.splitlines(True)
+    header_end = 0
+    for i, line in enumerate(lines):
+        stripped = line.strip()
+        if stripped.startswith(';') or stripped.startswith('target ') or stripped.startswith('source_filename') or not stripped:
+            header_end = i + 1
+            continue
+        break
+    return ''.join(lines[:header_end]) + comdat_block + ''.join(lines[header_end:])
+
+
 class Phase2Translator:
     """阶段二：使用声明接口翻译源文件"""
 
@@ -1812,6 +1871,7 @@ class Phase2Translator:
                             opt_content = re.sub(r'(@[\w.]+)\s*=\s*external\s+global\s+(\w[\w*]*)\s+(-?\d+|null|zeroinitializer|true|false)$', r'\1 = linkonce global \2 \3', opt_content, flags=re.MULTILINE)
                             opt_content = re.sub(r'(@[\w.]+)\s*=\s*(private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr)\s+(global|constant)', r'\1 = \2 dso_local \3', opt_content)
                             opt_content = re.sub(r'(@[\w.]+)\s*=\s+(?!private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr|dso_local)(global|constant)', r'\1 = dso_local \2', opt_content)
+                            opt_content = _AddWeakComdat(opt_content)
                             with open(optimized_ll, 'w', encoding='utf-8') as f:
                                 f.write(opt_content)
                             merged_obj = os.path.join(self.output_dir, '_merged.obj')
@@ -2045,6 +2105,7 @@ class Phase2Translator:
                 ll_content = re.sub(r'^(@[\w.]+)\s*=\s*external\s+global\s+(\w[\w*]*)\s+(-?\d+|null|zeroinitializer|true|false)$', r'\1 = linkonce global \2 \3', ll_content, flags=re.MULTILINE)
                 ll_content = re.sub(r'^(@[\w.]+)\s*=\s*(private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr)\s+(global|constant)', r'\1 = \2 dso_local \3', ll_content, flags=re.MULTILINE)
                 ll_content = re.sub(r'^(@[\w.]+)\s*=\s+(?!private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr|dso_local)(global|constant)', r'\1 = dso_local \2', ll_content, flags=re.MULTILINE)
+                ll_content = _AddWeakComdat(ll_content)
                 # LLVM 22+: 移除同一模块中已有 define 的 declare 语句（LLVM 22 将 declare+define 视为重复定义）
                 defined_funcs: set[str] = set()
                 for m in re.finditer(r'^define\s+(?:dso_local\s+)?[^@]*@\"?([^"\s\(]+)\"?\s*\(', ll_content, re.MULTILINE):
@@ -2795,6 +2856,7 @@ class Phase2Translator:
             ll_content = re.sub(r'^(@[\w.]+)\s*=\s*external\s+global\s+(\w[\w*]*)\s+(-?\d+|null|zeroinitializer|true|false)$', r'\1 = linkonce global \2 \3', ll_content, flags=re.MULTILINE)
             ll_content = re.sub(r'^(@[\w.]+)\s*=\s*(private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr)\s+(global|constant)', r'\1 = \2 dso_local \3', ll_content, flags=re.MULTILINE)
             ll_content = re.sub(r'^(@[\w.]+)\s*=\s+(?!private|internal|available_externally|linkonce|weak|common|appending|extern_weak|linkonce_odr|weak_odr|dso_local)(global|constant)', r'\1 = dso_local \2', ll_content, flags=re.MULTILINE)
+            ll_content = _AddWeakComdat(ll_content)
 
             # stub_decls 注入（复用预收集的 stub_decls）
             if stub_decls: