Bug#1118435: rocm-llvm: Dependency on clang-21 causes FTBFS in reverse dependencies

[Christian Kastner <ckk@debian.org>]

Package: hipcc
Version: 7.0.1+dfsg-1
Severity: serious

Dear Maintainer,

The recent update of hipcc to 7.0.1+dfsg-1 in unstable made src:ggml
FTBFS because its d/rules contains

    export HIPCXX=clang-17

I looked at two other samples of `build-rdeps hipcc`, ectrans and spfft,
and they use the same pattern, so this will affect them, too.

I'm filing this bug with severity: serious to prevent migration to testing.

With the understanding that a decision has been made against a
/usr/bin/hipcxx, a workaround would be to ship this in some private
directory of hipcc, for example

   /usr/lib/hipcc/bin/clang -> /usr/bin/clang-xx

where xx is the version of clang that this particular hipcc needs.

Best,
Christian