[Bug 1925320] Re: Backport packages for 20.04.3 HWE stack

[Timo Aaltonen]

** Description changed:

- PLACEHOLDER
+ [Impact]
  
- migrate to building libclc from llvm?
+ These are needed for 20.04.3 images.
+ 
+ [Test case]
+ 
+ Boot a daily image, see that it still has the necessary stack installed
+ and working.
+ 
+ [What could go wrong]
+ 
+ directx-headers: a new package, nothing can go wrong
+ 
+ libdrm: adds some new api, no changes to old stuff
+ 
+ llvm-12: a new package, no regression potential on it's own
+ 
+ libclc: just a rebuild against the new llvm
+ 
+ mesa: a new major release, but we'll pull the final stable release of
+ 21.0.x series, so there shouldn't be any regressions left at that point
+ 
+ xserver: a new point-release, 1.20.x series is in deep maintenance mode,
+ so there should be little chance of breakage

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https://bugs.launchpad.net/bugs/1925320

Title:
  Backport packages for 20.04.3 HWE stack

Status in directx-headers package in Ubuntu:
  Invalid
Status in libdrm package in Ubuntu:
  Invalid
Status in llvm-toolchain-12 package in Ubuntu:
  Invalid
Status in mesa package in Ubuntu:
  Invalid
Status in xorg-server package in Ubuntu:
  Invalid
Status in directx-headers source package in Focal:
  New
Status in libdrm source package in Focal:
  New
Status in llvm-toolchain-12 source package in Focal:
  New
Status in mesa source package in Focal:
  New
Status in xorg-server source package in Focal:
  New

Bug description:
  [Impact]

  These are needed for 20.04.3 images.

  [Test case]

  Boot a daily image, see that it still has the necessary stack
  installed and working.

  [What could go wrong]

  directx-headers: a new package, nothing can go wrong

  libdrm: adds some new api, no changes to old stuff

  llvm-12: a new package, no regression potential on it's own

  libclc: just a rebuild against the new llvm

  mesa: a new major release, but we'll pull the final stable release of
  21.0.x series, so there shouldn't be any regressions left at that
  point

  xserver: a new point-release, 1.20.x series is in deep maintenance
  mode, so there should be little chance of breakage

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