Your message dated Fri, 16 Oct 2026 09:03:36 +0200
with message-id <[email protected]>
and subject line Re: [Pkg-rust-maintainers] Bug#1134157: rustc-src: impossible
to satisfy crate dependencies
has caused the Debian Bug report #1134157,
regarding rustc-src: impossible to satisfy crate dependencies
to be marked as done.
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If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
1134157: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1134157
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Source: rustc
Version: 1.94.1+dfsg1-1~exp3
Severity: grave
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
In package rust-src, /usr/src/rustc-1.94.1/Cargo.lock and
usr/src/rustc-1.94.1/library/Cargo.lock are locked at crate
versions unsatifiable in Debian, e.g. rustc-demangle 0.1.26 and
object 0.37.3.
Also, /usr/src/rustc-1.94.1/library/std/Cargo.toml requires
newer-than-Debian crate including object 0.37.1, and
missing-in-Debian crates including dlmalloc and wasi.
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--- End Message ---
--- Begin Message ---
Version: 1.95.0+dfsg1-1
On Thu, 14 May 2026 12:43:49 +0200 Fabian =?utf-8?Q?Gr=C3=BCnbichler?=
<[email protected]> wrote:
> Control: tag -1 +pending
>
> On Sat, 18 Apr 2026 10:08:37 +0200 =?UTF-8?Q?Fabian_Gr=C3=BCnbichler?=
> <[email protected]> wrote:
> > On Fri, Apr 17, 2026, at 11:05 PM, Jonas Smedegaard wrote:
>
> > [..]
>
> > > It sounds like there is no bug here at all. Feel free to close this if
> > > that's how you see it.
> >
> > 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).
> >
> > It's a bit of a tough nut to crack though, because there can only be one
> > replacement for crates.io (which we already use for packaged crates), so
> > 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 so
> > on.
>
> It turned out that this is actually easier than I thought.
>
> 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).
>
> Upstream will start doing that as well:
>
> https://github.com/rust-lang/rust/pull/156196
>
> 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/create-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
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