Index: wasm/Writer.cpp
===================================================================
--- wasm/Writer.cpp
+++ wasm/Writer.cpp
@@ -443,8 +443,10 @@
     if (InputSegments.empty())
       continue;
     StringRef Comdat = InputSegments[0]->getComdat();
-    for (const InputSegment *IS : InputSegments)
+    for (const InputSegment *IS : InputSegments) {
+      (void)IS;
       assert(IS->getComdat() == Comdat);
+    }
     if (!Comdat.empty())
       Comdats[Comdat].emplace_back(ComdatEntry{WASM_COMDAT_DATA, I});
   }