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Re: Rust

From: Jelle Licht
Subject: Re: Rust
Date: Fri, 29 Jul 2016 18:08:24 +0200

I looked into this once;
I found a Rust compiler written in OCaml on the web.
There should be a path from that compiler to the current version of Rust.
The problem lies in the fact that the entire "1.9 build 1.10 builds 1.11" spiel only become the official policy of the Rust project recently.

disclaimer: the following is how I interpreted my communications with
the rust community. My apologies to anyone involved for any inaccuracies and/or misrepresentations.

This means that you could be looking at individual commits, as before this, I believe nightlies (snapshots) were used to compile the Rust compiler.

So, to ad to Alex' point, we would also need to expend (one-time) effort to
find this 'bootstrap-path' from the OCaml-based compiler to a more recent rustc.

In my admittedly little amounts of experience, the people working on rust
were not really seeing the problem with the current state of affairs, so good luck getting support with some arcane issues one might encounter packaging these ancient versions of rustc.

To quote kibwen from [1]:
"We can determine exactly how many builds you'd need by looking at the master snapshot file:

According to this, there have been 290 snapshots in total. And keep in mind that you would also need to rebuild LLVM quite a few times as well during this process, as Rust has continually upgraded its custom LLVM fork over the years."

Not sure if all this is worth the effort...

- Jelle


2016-07-29 17:34 GMT+02:00 Alex Griffin <address@hidden>:
On Fri, Jul 29, 2016, at 10:16 AM, Ludovic Courtès wrote:
> Do you know what’s Rust’s bootstrapping story is?  Can we reasonably
> expect to bootstrap it from source, using a series of previous Rust
> versions, or using an alternative implementation?

Yes, Rust 1.10 builds with the previous stable release (1.9) for the
first time. So we will only need one binary to bootstrap Rust. Although
this will quickly require a long chain of builds because Rust releases
every 6 weeks and 1.11 is only guaranteed to build with 1.10, etc.

So after only two years we may need to compile like 17 different
releases to get the current version.
Alex Griffin

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