[From nobody Fri Oct 16 08:05:07 2026 Received: (at 1134157-done) by bugs.debian.org; 16 Oct 2026 07:03:47 +0000 X-Spam-Checker-Version: SpamAssassin 4.0.1-bugs.debian.org_2005_01_02 (2024-03-25) on buxtehude.debian.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=4.0 tests=BAYES_00,FOURLA, HAS_BUG_NUMBER,MONOTONE_WORDS_2_15,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,VERSION autolearn=ham autolearn_force=no version=4.0.1-bugs.debian.org_2005_01_02 X-Spam-Bayes: score:0.0000 Tokens: new, 22; hammy, 150; neutral, 163; spammy, 0. spammytokens: hammytokens:0.000-+--autopkgtest, 0.000-+--cidebiannet, 0.000-+--ci.debian.net, 0.000-+--UD:ci.debian.net, 0.000-+--exp1 Return-path: <f.gruenbichler@proxmox.com> Received: from proxmox-new.maurer-it.com ([94.136.29.106]:41422) by buxtehude.debian.org with esmtps (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.96) (envelope-from <f.gruenbichler@proxmox.com>) id 1xHbyk-00DMx3-12 for 1134157-done@bugs.debian.org; Fri, 16 Oct 2026 07:03:47 +0000 Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 276234254B for <1134157-done@bugs.debian.org>; Fri, 16 Oct 2026 09:03:41 +0200 (CEST) Date: Fri, 16 Oct 2026 09:03:36 +0200 From: Fabian =?iso-8859-1?q?Gr=FCnbichler?= <f.gruenbichler@proxmox.com> Subject: Re: [Pkg-rust-maintainers] Bug#1134157: rustc-src: impossible to satisfy crate dependencies To: 1134157-done@bugs.debian.org MIME-Version: 1.0 User-Agent: astroid/0.17.0 (https://github.com/astroidmail/astroid) Message-Id: <1792133920.l8pz4k192r.astroid@yuna.none> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Bm-Milter-Handled: 55990f41-d878-4baa-be0a-ee34c49e34d2 X-Bm-Transport-Timestamp: 1792134219680 Version: 1.95.0+dfsg1-1 On Thu, 14 May 2026 12:43:49 +0200 Fabian =3D?utf-8?Q?Gr=3DC3=3DBCnbichler?= =3D <debian@fabian.gruenbichler.email> wrote: > Control: tag -1 +pending >=20 > On Sat, 18 Apr 2026 10:08:37 +0200 =3D?UTF-8?Q?Fabian_Gr=3DC3=3DBCnbichle= r?=3D <debian@fabian.gruenbichler.email> wrote: > > On Fri, Apr 17, 2026, at 11:05 PM, Jonas Smedegaard wrote: >=20 > > [..] >=20 > > > It sounds like there is no bug here at all. Feel free to close this i= f > > > that's how you see it. > >=20 > > I think I'll leave it open to track maybe finding a way to support > > -Zbuild-std in packaging context as well (e.g., to unlock some firmware > > building usecase in the future, that might require a custom libstd). > >=20 > > It's a bit of a tough nut to crack though, because there can only be on= e > > replacement for crates.io (which we already use for packaged crates), s= o > > we'd probably need to ship a copy of the vendored crates as part of > > rust-src, and adapt all the dependencies to be path dependencies, and s= o > > on. >=20 > It turned out that this is actually easier than I thought. >=20 > Starting with the next rustc upload, rust-src will ship a copy of the > few vendored crates needed to rebuild std/core/alloc. If you make them > available to cargo (i.e. by linking them into the fake registry), a lot > of build-std variants already work (some targets will of course require > extra setup or dependencies, like special linkers or LLVM bits). >=20 > Upstream will start doing that as well: >=20 > https://github.com/rust-lang/rust/pull/156196 >=20 > and plans to later switch build-std over to automatically pick those up, > at which point even linking them into the registry would no longer be > required. build-std should now work, rust-src ships the vendored crates required for building std/core/.. in /usr/src/rustc-1.X.Y/library/vendor/ and there is an autopkgtest ensuring it doesn't regress: https://salsa.debian.org/rust-team/rust/-/blob/debian/sid/debian/tests/crea= te-and-build-crate-with-build-std https://ci.debian.net/packages/r/rustc/unstable/amd64/76230036/#S10 as well as packages in the wild using it: https://sources.debian.org/src/m1n1/2.0.0-1~exp1/debian/rules there will likely be further developments upstream that will allow us to skip the manual symlinking of vendored crates, with cargo automatically picking them for building std/.. Fabian]