[Bug 2111265] Re: migrate mesa to llvm 20.1.2 or newer

[Timo Aaltonen]

plucky already has llvm-20 and spirv-llvm-translator-20 in the archive,
only mesa needs changing

** Summary changed:

- migrate to llvm 20.1.3 or newer
+ migrate mesa to llvm 20.1.2 or newer

** Changed in: llvm-toolchain-20 (Ubuntu Plucky)
       Status: New => Fix Released

** Changed in: spirv-llvm-translator-20 (Ubuntu Plucky)
       Status: Invalid => Fix Released

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

  [Test case]

  Check that drivers that require llvm still work, including swrast
  (llvmpipe), radeonsi.

  [Where things could go wrong]

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

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