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[Andreas Hasenack <2111265@xxxxxxxxxxxxxxxxxx>]

> Accepted llvm-toolchain-20 into noble-proposed.

This is stage1.

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

  Test with normal desktop usage, glxgears, glmark2, Unigine demos. That
  should give enough confidence that things still work.

  [Where things could go wrong]

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

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