From b7ef395cc125f42c3f43b419e22303b3d2f92f31 Mon Sep 17 00:00:00 2001
From: woodsmur <37290605+woodsmur@users.noreply.github.com>
Date: Fri, 31 Aug 2018 23:28:47 +0800
Subject: [PATCH] fix wasm executor compile error (#631)

---
 substrate/README.adoc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/substrate/README.adoc b/substrate/README.adoc
index 59f9f64096..885cb01b19 100644
--- a/substrate/README.adoc
+++ b/substrate/README.adoc
@@ -120,6 +120,7 @@ build it. Ensure you have Rust and the support software installed:
 curl https://sh.rustup.rs -sSf | sh
 rustup update nightly
 rustup target add wasm32-unknown-unknown --toolchain nightly
+rustup component add llvm-tools-preview --toolchain=nightly
 rustup update stable
 cargo install --git https://github.com/alexcrichton/wasm-gc
 sudo apt install cmake pkg-config libssl-dev git