wasm-reduce problems on OS X

[pepyakin]

Hi, check out my experience using wasm-reduce:

https://gist.github.com/pepyakin/79de4ac26d20adcd9db64bf85ef34cba

the problems I encountered:

• timeout is not installed on macOS
• wasm-opt can't be found without explicit env BINARYEN_ROOT.

I think that just a few more checks and error messages would be great to ease the experience!

[kripken]

Sorry, yeah, wasm-reduce is not very portable.

• I don't know how to replace timeout in a portable way (maybe using threads?).
• I'm also not sure how to fix the BINARYEN_ROOT issue, basically the executable needs to find another executable in the same dir as it, is there a way to do that in C++?

I agree it would be good to add checks with better error messages and suggestions in the meanwhile.

[pepyakin]

Sorry, yeah, wasm-reduce is not very portable.

No worries, that's ok! : )

I don't know how to replace timeout in a portable way (maybe using threads?).

I think that might be possibe with pthread?

I'm also not sure how to fix the BINARYEN_ROOT issue, basically the executable needs to find another executable in the same dir as it, is there a way to do that in C++?

Maybe you can extract base-dir from an argv[0] and put it into a global variable?