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Thu, 24 Jul 2025 06:00:49 -0400 (EDT) Received: by mail (OpenSMTPD) with ESMTPSA id 0366c8a8 (TLSv1.3:TLS_CHACHA20_POLY1305_SHA256:256:NO); Thu, 24 Jul 2025 10:00:47 +0000 (UTC) Date: Thu, 24 Jul 2025 12:00:44 +0200 From: Patrick Steinhardt To: Pierre-Emmanuel Patry Cc: eschwartz@gentoo.org, ethomson@edwardthomson.com, ezekielnewren@gmail.com, git@vger.kernel.org, gitgitgadget@gmail.com, me@ttaylorr.com, newren@gmail.com, phillip.wood123@gmail.com, sam@gentoo.org, sandals@crustytoothpaste.net Subject: Re: [PATCH 0/7] RFC: Accelerate xdiff and begin its rustification Message-ID: References: <7bf054a1-0196-4ad8-aaa4-a432cd2c93a5@embecosm.com> Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7bf054a1-0196-4ad8-aaa4-a432cd2c93a5@embecosm.com> On Thu, Jul 24, 2025 at 11:01:22AM +0200, Pierre-Emmanuel Patry wrote: > > On Tue, Jul 23, 2025 at 06:32:06 +0200, Patrick Steinhardt wrote: > > It would be great to know about the general timelines of these > > alternative implementations. > > We still think we'll be able to compile libcore before the end of the > summer, we've made great progress and few items are left. But keep in mind > we're targeting an older version of rust (1.49) and libcore is smaller than > the standard library. We still have a lot of testing to do and we expect > many bugs. Understood. Given that we don't plan to roll with the latest version of Rust anyway I think it could be a viable tradeoff for us to also consider gccrs when we determine the minimum required Rust version. > The next targeted version will probably be rust 1.78 as we want to keep up > with rust for linux. This shouldn't be too long as most of the features are > coming from either standard library modifications or nightly features we > already had to support for 1.49. > > We expect to be able to compile some 1.49 code correctly next year at best. And I expect that 1.78 will be another significant effort that won't land before the year after? > I would like to bring to your attention rustc_codegen_gcc which adds a gcc > backend to the rustc frontend, although not a full gcc compiler it could > help supporting some architectures that are currently not supported by llvm. For my own understanding: is this something that the Git project would have to support or something that the distributor needs to set up? Patrick