Bug#955144: libclang-dev: package could not be installed

[Simon McVittie]

On Tue, 31 Mar 2020 at 09:34:04 +0100, Simon McVittie wrote:
> I think the options to resolve this bug are:
> 
> - Move llvm-toolchain-9 from gcc-8 development libraries to -9 or -10
>   (I don't know whether this is a simple binNMU or whether it needs more
>   intrusive changes)
> - Change the default to llvm-toolchain-10, as has already happened in
>   unstable

Er, that should of course say: as has already happened in *experimental*.

On #debian-devel, kilobyte pointed out that if any packages are broken
by advancing from LLVM 9 to 10, we will likely need to fix them for
the bullseye release anyway, so perhaps nothing is lost by doing that
transition sooner rather than later.

However, mesa appears to be a prominent example of a package that currently
requires LLVM 9, and doesn't work with 10 yet.

> - Convince the gcc-8 maintainer to fix #954826 by removing the epoch from
>   the dependency (and possibly disabling gnat, since apparently gnat-8 is
>   no longer available) instead of by removing the package