diff --git a/App/lib/core/Phase2.vp b/App/lib/core/Phase2.vp
index 3e0dd37..8b51a40 100644
--- a/App/lib/core/Phase2.vp
+++ b/App/lib/core/Phase2.vp
@@ -980,6 +980,7 @@ def RunMultiFileProject(mb: memhub.MemBuddy | t.CPtr,
         # 不再全量收集 includes.binary 下的所有 .obj
         if reachable_set is not None and reachable_count > 0:
             ibd_len_pc: t.CSizeT = string.strlen(includes_binary_dir)
+            td_len_pc: t.CSizeT = string.strlen(temp_dir)
             ri_pc: int
             for ri_pc in range(reachable_count):
                 rsha1_pc: str = reachable_set + t.CSizeT(ri_pc) * 17
@@ -1001,10 +1002,13 @@ def RunMultiFileProject(mb: memhub.MemBuddy | t.CPtr,
                             fop_pos += op_len_pc
                             final_obj_paths[fop_pos] = '\0'
                     else:
-                        fb_pc: str = VLogger.fmt_buf()
-                        if fb_pc is not None:
-                            viperlib.snprintf(fb_pc, 1024, "可达模块 .obj 缺失: %s", obj_path_pc)
-                            VLogger.error(fb_pc, "PhaseC")
+                        # .obj 缺失：纯声明模块（text.ll 无 define 行，如 stdio.vp 全 pass）
+                        # 无需 .obj，静默跳过；实现文件缺失才是编译产物异常（fail-fast）
+                        if StubMerger.IsDeclOnlyModule(temp_dir, td_len_pc, rsha1_pc) != 1:
+                            fb_pc: str = VLogger.fmt_buf()
+                            if fb_pc is not None:
+                                viperlib.snprintf(fb_pc, 1024, "可达模块 .obj 缺失: %s", obj_path_pc)
+                                VLogger.error(fb_pc, "PhaseC")
                     stdlib.free(obj_path_pc)
 
         final_obj_paths[fop_pos] = '\0'
diff --git a/App/lib/core/StubMerger.vp b/App/lib/core/StubMerger.vp
index f9c7439..4d298e4 100644
--- a/App/lib/core/StubMerger.vp
+++ b/App/lib/core/StubMerger.vp
@@ -729,6 +729,61 @@ def LookupSha1RelPath(sha1: str) -> str:
     return None
 
 
+# ============================================================
+# IsDeclOnlyModule - 判断模块是否为纯声明文件
+#
+# 读取 {temp_dir}/{sha1}.text.ll，扫描是否含 "define " 行：
+#   返回 1 = 纯声明（无函数体，如 stdio.vp 全 pass），无需 .obj
+#   返回 0 = 实现文件（含 define 函数体）
+#   返回 -1 = text.ll 不存在/无法判断
+#
+# 与 Phase B+（Phase2.vp 编译缺失 includes 时）的内联判断逻辑一致，
+# 供 Phase C 链接时区分"声明文件无需 .obj"与"实现文件缺失"。
+# ============================================================
+def IsDeclOnlyModule(temp_dir: str, td_len: t.CSizeT, sha1: str) -> int:
+    """判断模块是否为纯声明文件（text.ll 无 define 行）"""
+    if temp_dir is None or sha1 is None:
+        return -1
+    tpath: str = _sliced_path(temp_dir, td_len, sha1, "text.ll")
+    if tpath is None:
+        return -1
+    tf_d: fileio.File | t.CPtr = fileio.File(tpath, fileio.MODE.R)
+    stdlib.free(tpath)
+    if tf_d.closed:
+        return -1
+    tbuf_d: bytes = stdlib.malloc(STUB_READ_BUF_SIZE)
+    tbr_d: t.CInt64T = 0
+    if tbuf_d is not None:
+        tbr_d = tf_d.read_all(tbuf_d, STUB_READ_BUF_SIZE)
+    tf_d.close()
+    if tbuf_d is None:
+        return -1
+    if tbr_d <= 0:
+        # 空 text.ll：无函数体，纯声明
+        stdlib.free(tbuf_d)
+        return 1
+    if tbr_d < STUB_READ_BUF_SIZE:
+        tbuf_d[tbr_d] = '\0'
+    else:
+        tbuf_d[STUB_READ_BUF_SIZE - 1] = '\0'
+    # 逐行扫描：找 "define " 行即为实现文件
+    tpos_d: t.CSizeT = 0
+    while tpos_d < tbr_d:
+        tls_d: t.CSizeT = tpos_d
+        while tpos_d < tbr_d:
+            if tbuf_d[tpos_d] == '\n':
+                break
+            tpos_d += 1
+        tll_d: t.CSizeT = tpos_d - tls_d
+        if tpos_d < tbr_d:
+            tpos_d += 1
+        if tll_d >= 7 and string.strncmp(tbuf_d + tls_d, "define ", 7) == 0:
+            stdlib.free(tbuf_d)
+            return 0
+    stdlib.free(tbuf_d)
+    return 1
+
+
 # ============================================================
 # _IsFuncDeclaredOrDefined - 检查 out_buf 中是否已有函数的 declare/define
 #