[spijdar]

Haha, I haven't yet, but I want to. Maybe soon! Though extending libc isn't that exciting, really: that's kind of the cool (Unix-y??) thing about it. You just (IIRC) extract the static archive, add whatever .o object files with whatever symbols, add the symbols to a manifest, pack it up, and any C program on the system can call it. Since all C functions were implicit at the time (header files only had structs and enums) you can use trivially add whatever.

> Ultra 5

You should give it a shot! Even NetBSD/sparc64 has support for SunOS 4 binaries... allegedly.

If one was so inclined, you can abuse the kernel a bit and tell the compat layers to use root as their search path. I did this to make a "Linux system" with a NetBSD kernel and full GNU/Linux userland, just for kicks.

In my mind, you could do the same for SunOS. There's also COMPAT_MACH and COMPAT_DARWIN... imagine NeXT/SPARC binary compatibility alongside SunOS.

Hmmm. :)