linux-kernel - RE: Linux kernel in-tree Rust support

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Date:   Mon, 20 Jul 2020 14:46:41 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Adrian Bunk' <bunk@...nel.org>, Arnd Bergmann <arnd@...db.de>
CC:     Josh Triplett <josh@...htriplett.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "alex.gaynor@...il.com" <alex.gaynor@...il.com>,
        "geofft@...reload.com" <geofft@...reload.com>,
        "jbaublitz@...hat.com" <jbaublitz@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        "Linus Torvalds" <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: RE: Linux kernel in-tree Rust support

From: Adrian Bunk
> Sent: 19 July 2020 19:19
...
> The correct range for a mandatory tool are the 6 to 12 years for gcc.
> 
> Debian stable and Ubuntu LTS are providing (different) mechanisms
> for installing the kernel from the next stable/LTS release 2 years
> later[1] for supporting new hardware.
> If kernel 5.12 LTS cannot be compiled on Ubuntu 20.04 LTS with
> the 2019 gcc 9 there would be pain downstream.

We have customers that are (still) using RHEL6 (2.6.32 era).
Since we have to build C++ programs that will run on those
systems we have systems with very old toolchains.
(Yes, you can build in a chroot or an a VM but that needs
setting up quite carefully - easier to keep the old machine.)

It is rather a PITA when kernel builds deprecate the installed gcc.
Now I'm not sure a 5.x kernel will run with the userspace from RHEL6.
But I know it runs with that from Ubuntu 13.04.
In a few years I'll be able to use the 13.04 system for release builds
but it is still far too new for that.
However I can no longer build 'current' custom kernels on it.
I've other (newer) systems but they aren't any (maybe much) faster.

	David

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