wasm2c support

[zyedidia]

Is wasm2c still supported? It looks like this project switched from wasm2c to w2c2 as the default, but there is still some leftover code from wasm2c. I briefly tried to get it working, but it looks like maybe the old code is no longer compatible with the latest version of wasm2c, is that correct?

[vshymanskyy]

What is the motivation behind moving back to wasm2c?

[zyedidia]

The motivation was that wasm2c at least attempts to sandbox WebAssembly code, while w2c2 is not meant for sandboxing. For example, w2c2 does not perform type-safety checks on indirect calls, making it easy to perform a sandbox breakout attack. Since opening this issue though I have made my own adaptation of wasm2native that supports wasm2c, so I no longer consider this an important issue -- feel free to close it.