Special characters in mangled names

[Daveed Vandevoorde]

Two weeks ago we made some initial discussions about what special
characters we could us as an "escape encoding" for mangled names
(in cfront and cfront-like models, a double underscore is used,
but it seems desirable to instead have a convention that cannot
collide with C identifiers at all).

The period (".") was mentioned.  Does that work for all the IA-64
assemblers (and similar tools) out there?

What other characters are similarly available?

	Daveed