Bug#1050071: llvm-defaults: move to 16

[Adrian Bunk]

On Mon, Sep 11, 2023 at 10:36:00AM +0100, Simon McVittie wrote:
> On Sat, 19 Aug 2023 at 10:39:44 +0200, Sylvestre Ledru wrote:
> > llvm-defaults has been pointing to 16 in experimental for quite sometime.
> > Opening this transition to make sure it is on your radar! :)
> > 
> > I opened bug #1050070 & #1050069 for future removals.
> 
> Mesa is a significant user of LLVM, and hard-codes its own non-default
> version of LLVM which often runs ahead of the default (currently 15).
> It seems to be relatively common for a LLVM version upgrade to cause
> regressions or uninstallability on at least one architecture, and also
> relatively common for a LLVM version upgrade to be necessary to unblock
> features or bug fixes in Mesa, which I assume is why the Mesa maintainers
> have felt the need to control this themselves.
> 
> Should Mesa try moving to -16 *before* the default changes? It would
> seem unhelpful to move the rest of the distribution to a version that
> Mesa can't use for whatever reason.
>...

Mesa is not the sole user of a non-default LLVM.

This transition is about changing the default, which affects the 
packages that use the default version.

Users of non-default LLVM like mesa/rustc/chromium/ghc/qt6-tools/... 
move at their own pace (otherwise they would use the default LLVM).

>     smcv

cu
Adrian