On Tue, Nov 23, 2021 at 3:00 AM Henry Bent <henry.r.bent@gmail.com> wrote:
On Mon, 22 Nov 2021 at 21:31, Mary Ann Horton <mah@mhorton.net> wrote:
PL/I was my favorite mainframe programming language my last two years as
an undergrad. I liked how it incorporated ideas from FORTRAN, ALGOL, and
COBOL. My student job was to enhance a PL/I package for a History professor.

What language were the PL/I compilers written in?

The only PL/I compiler I have access to is, somewhat ironically, the Multics PL/1 compiler. It is largely self-hosting; more details can be found here: https://multicians.org/pl1.html (Note Doug's name appears prominently.)

Wikipedia claims that IBM is still developing a PL/I compiler, which I suppose I have no reason to disbelieve, but I'm very curious as to who is using it and for what purpose.

I imagine most of it is legacy code in a mainframe environment, similarly to COBOL. I can't imagine that many folks are considering new development in PL/1 other than in retro/hobbyist environments and some mainframe shops where there's a heavy existing PL/I investment.

        - Dan C.