[Info-vax] VMS Software Q1 '23 Update

[John Reagan]

On Sunday, February 5, 2023 at 6:20:34 PM UTC-5, Dan Cross wrote:
> In article <b40d16a3-7cca-4364... at googlegroups.com>,
> John Reagan <xyzz... at gmail.com> wrote: 
> >BTW, the Rust compiler is written in Rust. You have to bootstrap it from a Linux box.
> Not necessarily. mrustc has been used to successfully bootstrap 
> rustc.
> >Not a show stopper (that is exactly what we did with clang), but one more piece to the 
> >puzzle.
> One of the nice things about rustc/clang/LLVM is that compilers 
> are pretty much cross-compilers by default, so development is 
> greatly accelerated. 
> 
> - Dan C.

I'm impressed.   I wouldn't have guessed that mrustc would be up to that task.

For our Linux to OpenVMS bootstrap for LLVM, we had to change/add several hundred
lines of code.  Our memory model isn't exactly small, medium, or large.  LLVM has several
tables of "known names" for routines that live in libc/libm on Linux that need changed.
And others

For clang, to bootstrap had to worry about headers since the Linux-hosted compiler was
going to make objects that link on OpenVMS so even more RTL name prefixes, etc.  And
many (most?) of those headers from OpenVMS use pragmas we had to add/extend.

John