[Pkg-rust-maintainers] Bug#1043374: rust-bindgen: Please update to avoid future LLVM-16 bug

[Andreas Hasenack]

Package: rust-bindgen
Version: 0.60.1-2
Severity: normal

Dear maintainer,

in Ubuntu we are using LLVM-16 already, and I came across an FTBFS[0]
in src:rust-nettle-sys[1] that, after some troubleshooting, showed it
was only failing to build when built with rust-bindgen 0.60.x.

[nettle-sys 2.2.0] thread 'main' panicked at
'"aes_ctx_union_(unnamed_at_/usr/include/nettle/aes_h_150_3)" is not a
valid Ident', /<<PKGBUILDDIR>>/debian/cargo_registry/proc-macro2-1.0.65/src/fallback.rs:791:9

If I remove the src:rust-nettle-sys patch[2] that changes the bindgen
dependency, the build then uses a newer rust-bindgen from upstream
(0.63.0) and works.

Going over upstream's rust-bindgen repository[3] I found a bug[4] that
started manifesting itself with llvm-16, and that's what I'm seeing
when building src:rust-nettle-sys with rust-bindgen 0.60.1. Applying
the patch from the PR[5] linked in that bug report to src:rust-bindgen
and installing the resulting packages fixes the build of
src:rust-nettle-sys.

I would kindly ask to apply that patch in debian's src:rust-bindgen
package, or perhaps updated to rust-bindgen 0.62.0 or higher (latest
version is currently 0.66.1), to avoid problems when Debian moves to
LLVM-16 as default. In Ubuntu, I'll probably apply the patch, to avoid
becoming too different from debian for the time being.

Thanks!


0. https://bugs.launchpad.net/ubuntu/+source/rust-nettle-sys/+bug/2030886
1. https://bugs.launchpad.net/ubuntu/+source/rust-nettle-sys/+bug/2030886
2. https://salsa.debian.org/rust-team/debcargo-conf/-/blob/master/src/nettle-sys/debian/patches/0002-Relax-dependency-on-bindgen.patch
3. https://github.com/rust-lang/rust-bindgen
4. https://github.com/rust-lang/rust-bindgen/issues/2312
5. https://github.com/rust-lang/rust-bindgen/pull/2316