Error: Cannot find binary path

[wmlgl]

🐛 Bug description

Wrong when run wasm-pack in msys2, like this

$ RUST_LOG=debug wasm-pack build
 INFO 2019-10-28T14:40:35Z: wasm_pack::command: Running build command...
 INFO 2019-10-28T14:40:36Z: wasm_pack::command::build: Checking rustc version...
 INFO 2019-10-28T14:40:36Z: wasm_pack::command::build: rustc version is 38.
 INFO 2019-10-28T14:40:36Z: wasm_pack::command::build: Checking crate configuration...
 INFO 2019-10-28T14:40:36Z: wasm_pack::command::build: Crate is correctly configured.
 INFO 2019-10-28T14:40:36Z: wasm_pack::command::build: Checking for wasm-target...
[INFO]: Checking for the Wasm target...
Error: Cannot find binary path

👟 Steps to reproduce

1.Install cargo, run this command on git-bash

 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

2.Install wasm-pack, run this command on git-bash

curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh

3.Install msys2，follow steps 1 through 6

http://www.msys2.org/

4.start msys2, install gcc

pacman -S gcc

5.Change toolchain to stable-x86_64-pc-windows-gnu

6.Create a wasm project, follow Quickstart Guide

https://github.com/rustwasm/wasm-pack/tree/v0.8.1

7.Build project on msys2

🌍 Your environment

system: windows 8.1
wasm-pack version: wasm-pack 0.8.1
rustc version: rustc 1.38.0 (625451e37 2019-09-23)
path: /usr/local/bin:/usr/bin:/bin:/opt/bin:/c/windows/system32:/c/windows:/c/windows/System32/Wbem:/c/windows/System32/WindowsPowerShell/v1.0:/g/Software/Microsoft VS Code/bin:/f/softwave/nvm:/f/softwave/nodejs:/f/Program Files/TortoiseSVN/bin:/g/Software/Microsoft VS Code/Code.exe/bin:/c/Program Files (x86)/GtkSharp/2.12/bin:/c/Users/wumingli/.cargo/bin:/e/Program Files/Git/cmd:/g/Software/Java/jdk1.8.0_60/bin:/g/Software/Adk/platform-tools:/g/Software/Adk/tools:/f/softwave/nvm:/f/softwave/nodejs:/g/Software/gradle-4.9/bin:/e/Program Files/ffmpeg/bin:/c/Users/wumingli/AppData/Roaming/npm:/c/Users/wumingli/.cargo/bin:/usr/bin:/c/Users/wumingli/.cargo/bin