Comment # 5 on bug 1221183 from Aaron Puchert

(In reply to Richard Biener from comment #2)
> That's then required in all clang7, clang11, clang13 and clang15?  In the SP2
> codestream we also seem to have llvm9 and I can't see llvm13 so that's
> possibly
> only via the OBS sle-backports repository?

Yes, llvm13 (and llvm14) is in Backports. I can take care of this.

> I'll note I had issues with the Factory python3-clang conflicts/provides
> switching from %python3_sitearch to something else so I reverted that
> (but only for llvm17).

Yes, that's fine. I mostly think about Factory when packaging and don't
consider compatibility issues with Leap. This is one of those cases.

(In reply to Richard Biener from comment #3)
> The change for llvm15 seems to be just adding to clang_binfiles?  The
> alternatives stuff there is obfuscated by macros.

Yes, adding to clang_binfiles and removing from the file list is the equivalent
change.
(https://build.opensuse.org/package/rdiff/devel:tools:compiler/llvm15?linkrev=base&rev=28)

Obfuscation was not the intention. The binaries were duplicated a couple of
times, and since almost every major update adds and removes binaries, and I
always messed something up, I decided that having the list of binaries in one
place is better. That's what you find in the beginning of the spec file plus a
macro %lapply that applies another macro element-wise to a list. (Admittedly,
the "list apply" is a bit of black magic, and I'd like to find a better way
sometime.)

As a nice side effect, this reduced the spec file by a couple hundred lines.
(https://build.opensuse.org/request/show/995044)

> IMO the even older llvm might be better dropped on update?

Can't talk about the versions in SLE, but the versions in Backports are
unfortunately still being used:

$ osc whatdependson openSUSE:Backports:SLE-15-SP6 llvm13 standard x86_64
llvm13 :
      autofdo
      velociraptor
      velociraptor-client
$ osc whatdependson openSUSE:Backports:SLE-15-SP6 llvm14 standard x86_64
llvm14 :
      gtkd
      ispc
      klee
      klee-uclibc
      ldc
      python3-pyside2
      python3-pyside2:sle15_python_module
      tilix
      tvm

Not sure to which extent these packages could switch to other versions. The
klee maintainer has pinned to llvm14, although a wider range of versions should
be supported. Maybe we can relax this. The issue with ldc in the past was
bootstrapping, not sure to which extent that has been addressed.