llvm-toolchain-21 (2:21.1.4-4) unstable; urgency=medium

  In order to allow for smoother upgrades for packages whose programs
  dynamically link against them, we have renamed the libc++1-21,
  libc++abi1-21, and libunwind-21 libraries to drop the major versions.
  Henceforth, the shared libraries will be in the libc++1, libc++abi1,
  and libunwind1 packages.

  This brings LLVM's libc++ packages in line with the conventions of
  GNU GCC's libstdc++ packages. As of June 2025, upstream has documented
  guarantees that upgrades of libc++ will not break application binary
  interfaces:
  https://github.com/llvm/llvm-project/blob/main/libcxx/docs/ABIGuarantees.rst

 -- Andres Salomon <dilinger@debian.org>  Sat, 13 Sep 2025 04:25:28 -0400