[TUHS] History of non-Bell C compilers?

[arnold at skeeve.com]

Henry Bent <henry.r.bent at gmail.com> wrote:

> On Thu, 7 Mar 2024 at 18:14, Tom Lyon <pugs78 at gmail.com> wrote:
>
> > For no good reason, I've been wondering about the early history of C
> > compilers that were not derived from Ritchie, Johnson, and Snyder at Bell.
> > Especially for x86.  Anyone have tales?
> > Were any of those compilers ever used to port UNIX?
> >
>
> As a slightly separate addendum, I'm curious about the slightly later
> history of compilers for commercial UNIX distributions.  Were these derived
> from the Bell/BSD sources or were they "clean room" approaches?  I'm
> thinking of SunPRO, IBM XL C, the MIPS compiler, DEC GEM, etc.
>
> -Henry

I think the first MIPS compiler was PCC based and then later it
was rewritten. I'm pretty sure the others were developed from
scratch, but undoubtedly others here know for sure.

Arnold