using segmented stack feature


I want to use the segmented stack feature but I did not found much documentation for it.
I hope you could answer my questions:

1.) can I use the segmented stacks with clang?
2.) what are the requirements? GCC requires for its split stack the GOLD linker and GCC compiled with split stack support.
3.) is a howto available demonstrating the usage of segmented stacks (which functions have to be called etc.

best regards,