Just FYI: The Clang++ command-line argument parser implements a language that rivals C++ in awfulness.

-arg parm
-arg=parm
-argparm
-argparm parm2

are all supported, with the last one having a second argument.

Also,

-arg
--arg

may be supported in one or both of the above forms, depending on the argument. (The software
seems to also support -arg and --arg being different arguments entirely, but never actually does it.)

(It's a really good compiler, though.)