[cc65] Support for runtime / libs with self-modifying-code?

Hi,

once again, I'm coming up with a strange proposal:

Some time ago I discussed with Uz the use of self-modifying-code (SMC) 
in library
functions, which is today prohibited, since the code cc65 produces must 
be 'ROMable'.

This is of course a good thing, needed and supports a general use case.

But since most of my code (and I think others too) runs in RAM, I ask
myself if it would make sense to introduce an additional runtime/library 
variant.
This could be allowed to use SMC for speed & size optimization - chosen 
by a linker setting -
just the way there are different library flavors (dynamic, static, 
multi-threading etc.)
on other platforms too.

First the SMC set would be a copy of the existing library set. 
Improvements could be introduced
step wise and I promise to provide some of these changes.

Any comments?
Christian

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