Index: llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
===================================================================
--- llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ llvm/trunk/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -126,6 +126,7 @@
       auto Written =
           FP.convertToHexString(buf, /*hexDigits=*/0, /*upperCase=*/false,
                                 APFloat::rmNearestTiesToEven);
+      (void)Written;
       assert(Written != 0);
       assert(Written < BufBytes);
       OS << ' ' << buf;