Bug#1029003: llvm-toolchain-15: unable to install clang-15 & libclang-rt-15-dev

[Michael Ford]

Package: llvm-toolchain-15
Version: 1:15.0.6-5~exp3

Using the following:
  apt update && apt upgrade -y &&
  apt install -t experimental clang-15 libclang-rt-15-dev

with the latest debian:experimental Docker image
(experimental-20230109), results in:

The following packages have unmet dependencies:
 libclang-rt-15-dev : Breaks: libclang-common-15-dev (< 1:15.0.6-5)
but 1:15.0.6-5~exp3 is to be installed

This worked previously, and may have been broken by a recent change, possibly:

  llvm-toolchain-15 (1:15.0.6-5~exp1) experimental; urgency=medium

  * libclang-common-15-dev splitted into different packages:
    - libclang-rt-15-dev
    - libpolly-15-dev
    - libclang-rt-15-dev-wasm32
    - libclang-rt-15-dev-wasm64