From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark H Weaver <mhw@netris.org>
Subject: Question about Rust bootstrap
Date: Thu, 20 Sep 2018 02:35:27 -0400
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In-Reply-To: <20180916141235.2c36a0b4@scratchpost.org> (Danny Milosavljevic's
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To: Danny Milosavljevic <dannym@scratchpost.org>
Cc: guix-devel@gnu.org

Hi Danny,

Speaking of our Rust packages, I have a question: is it intentional that
'rust-1.23' is still built using 'rust-bootstrap' and not 'rust-1.22'?

The reason I ask is that, to my delight, there appears to be (almost?)
everything needed for a complete source-only bootstrap chain for recent
Rust:

* rust-1.19.0 is built using mrustc
* rust-1.20.0 is built using rust-1.19.0
* rust-1.21.0 is built using rust-1.20.0
* rust-1.22.1 is built using rust-1.21.0
* rust-1.23.0 is built using pre-built 'rust-bootstrap' (1.22.1)  (???)
* rust-1.24.1 is built using rust-1.23.0
* rust-1.25.0 is built using rust-1.24.1
* rust-1.26.2 is built using rust-1.25.0
* rust-1.27.2 is built using rust-1.26.2

This chain would be complete if 'rust-1.23' were built using 'rust-1.22'
instead of 'rust-bootstrap'.  Since both 'rust-1.22' and
'rust-bootstrap' are apparently for the same version of Rust (1.22.1),
I would naturally expect one to work in place of the other one.
Have you tried it?

      Thanks,
        Mark