https://github.com/MitchBradley/cforth
My "Evil Software Hoarder" friend Mike Gallaher and I from UniPress Software visited Apple once so he could compile and install the latest version of UniPress Emacs on their Cray. I think it was their purple Cray XMP/28 running UNICOS. I don't remember which compiler it used, though.
https://wiki.c2.com/?AppleCrayComputer
https://cray-history.net/2021/07/16/apple-computer-and-cray-...
https://i0.wp.com/cray-history.net/wp-content/uploads/2021/0...
https://i0.wp.com/cray-history.net/wp-content/uploads/2021/0...
https://i0.wp.com/cray-history.net/wp-content/uploads/2021/0...
https://i0.wp.com/cray-history.net/wp-content/uploads/2021/0...
https://retrocomputingforum.com/t/apples-purple-cray-hooked-...
UniPress ported and sold a commercial version of the "Extended Amsterdam Compiler Kit" for Andrew Tanenbaum for many CPUs and versions of Unix (like they also ported and sold his Unix version of Emacs for James Gosling), so Emacs might have been compiled with ACK on the Cray, but I don't recall.
During the late 80's and early 90's, UniPress's Enhanced ACK cost $9,995 for a full source license, $995 for an educational source license, with front ends for C, Pascal, BASIC, Modula-2, Occam, and Fortran, and backends for VAX, 68020, NS32000, Sparc, 80368, and others, on many contemporary versions of Unix.
Rehmi Post at UniPress also made a back-end for ACK that compiled C to PostScript for the NeWS window system and PostScript printers, called "c2ps", which cost $2,995 for binaries or $14,995 for sources.
Independently Arthur van Hoff wrote a different C to PostScript compiler called "PdB" at the Turing Institute, not related to c2ps. It was a much simpler, more powerful, more direct compiler written from scratch, and it supported object oriented PostScript programming in NeWS, subclassing PostScript from C or C from PostScript. I can't remember how much Turing sold it for, but I think it was less than c2ps.
https://compilers.iecc.com/comparch/article/92-04-041
http://www.aaronjamesrogers.com/misc/hotmix16/vendors/sgi/ap...
https://donhopkins.com/home/archive/NeWS/NeScheme.txt
https://news.ycombinator.com/item?id=10088193
I got to watch Apple's Cray compile Emacs very quickly through the plexiglass viewing window, but they wouldn't let me sit or nap on it, alas.
I knew a guy who worked at one of the national labs that had its own Cray supercomputer, in a computer room with a big observation window that visitors could admire it through, of course (all Crays required observations windows to show them off).
Just before a tour group came by, he hid inside the Cray, and waited for them to arrive. Then he casually strolled out from the back of the Cray, pulling up the zipper of his jeans, with a sheepish relieved expression on his face, looked up and saw the tour group, acted startled, then scurried away.