[saurik]

For a while there was an exciting patch for gcc called split stacks that provided a little thunk for every function -- one normally bypassed, but which stackless coroutines could opt in to call -- that would check if more stack had to be allocated, but I think the story was that Go was the primary potential customer for it and they decided to just give up on the dream :(.

[gpderetta]

You can use segmented stacks in c++ just fine I think. I believe boost.coroutine supports it. The problem is the additional overhead and the impossibility to link against any non-split stack code.