diff --git a/clang/lib/Driver/ToolChains/WebAssembly.h b/clang/lib/Driver/ToolChains/WebAssembly.h
--- a/clang/lib/Driver/ToolChains/WebAssembly.h
+++ b/clang/lib/Driver/ToolChains/WebAssembly.h
@@ -71,6 +71,7 @@
   const char *getDefaultLinker() const override { return "wasm-ld"; }
 
   Tool *buildLinker() const override;
+  std::string getCompilerRTPath() const;
 };
 
 } // end namespace toolchains
diff --git a/clang/lib/Driver/ToolChains/WebAssembly.cpp b/clang/lib/Driver/ToolChains/WebAssembly.cpp
--- a/clang/lib/Driver/ToolChains/WebAssembly.cpp
+++ b/clang/lib/Driver/ToolChains/WebAssembly.cpp
@@ -155,6 +155,19 @@
   }
 }
 
+std::string WebAssembly::getCompilerRTPath() const {
+  // If we're doing LTO and we have an LTO library available, use it.
+  const auto &D = getDriver();
+  if (D.isUsingLTO()) {
+    auto Dir = AppendLTOLibDir(ToolChain::getCompilerRTPath());
+    if (llvm::sys::fs::exists(Dir))
+      return Dir;
+  }
+
+  // Otherwise just use the default.
+  return ToolChain::getCompilerRTPath();
+}
+
 bool WebAssembly::IsMathErrnoDefault() const { return false; }
 
 bool WebAssembly::IsObjCNonFragileABIDefault() const { return true; }