ESP8266 Community Forum

Then someone with hardware will need to figure out how to flash and run the app.

http://www.electrodragon.com/
is going to try and get some of those dev boards from this place
http://detail.1688.com/offer/4025819424 ... gsda_offer
It is too hard for a foreigner to order from 1688.com

Overlay file from that VM is attached. It will let you build the compiler. It has GPL licenses in it.

Still, _xtos_set_exception_handler is far from rocket science to replicate (or replace with a stub). I figure the problem is that the library depends on the effects of this function (namely, registering an exception handler for a given exception cause)?
We have the sources for proprietary functions like this one, although I guess we are legally not allowed to use those.

Clean room implement it. Read the source, write out a description in English of what it needs to do. Hand that description to someone who has not seen the source and have them implement it. Repeat until it works.

There is no need to implement _xtos_set_exception_handler it is in the ROM.