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[Timo Aaltonen <2111265@xxxxxxxxxxxxxxxxxx>]

OpenGL renderer string: llvmpipe (LLVM 20.1.2, 128 bits)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 25.0.7-0ubuntu0.24.04.2

tested on proxmox vm with enough ram to run the Unigine demos, and all
seems to be well

** Tags removed: verification-needed verification-needed-noble
** Tags added: verification-done verification-done-noble

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https://bugs.launchpad.net/bugs/2111265

Title:
  migrate mesa to llvm 20.1.2 or newer

Status in llvm-toolchain-20 package in Ubuntu:
  Invalid
Status in mesa package in Ubuntu:
  Fix Released
Status in spirv-llvm-translator-20 package in Ubuntu:
  Invalid
Status in llvm-toolchain-20 source package in Noble:
  Fix Released
Status in mesa source package in Noble:
  Fix Released
Status in spirv-llvm-translator-20 source package in Noble:
  Fix Released
Status in llvm-toolchain-20 source package in Plucky:
  Fix Released
Status in mesa source package in Plucky:
  Fix Released
Status in spirv-llvm-translator-20 source package in Plucky:
  Fix Released

Bug description:
  [Impact]

  This is needed for some new AMD RDNA4 platforms that require the newer
  llvm for runtime shader compilation.

  Skipping oracular, as it is going to be EOL soon.

  Note that llvm-toolchain-20 needs to be built twice on noble, first
  without llvm-spirv-20 which doesn't exist yet, and then after spirv-
  llvm-translator-20 has built, it's built a second time *with* llvm-
  spirv-20 which is needed to build libclc-20 which Mesa needs.

  [Test case]

  Install updates, check that drivers that require llvm still work,
  including swrast (llvmpipe), radeonsi:

  - check that the desktop is still using hw acceleration and hasn't fallen back to swrast/llvmpipe
  - run freely available benchmarks that torture the GPU (Unigine Heaven/Valley/Superposition)
  - run some games from Steam if possible

  
  [Where things could go wrong]

  The new llvm version might result in buggy behaviour with the
  swrast/radeonsi drivers.

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