[Bug 2141360] [NEW] [SRU] include upstream fixes for libclang-rt-19-dev on armhf

[Karl Smeltzer]

Public bug reported:

[ Impact ]

 * LLVM upstream has released 19.1.7, but our Noble package is still
   on 19.1.1

 * We have confirmed cases of users affected by bugs that are already
   fixed upstream. For example, see: pad.lv/2097731

 * The Noble package will now match what's already in later releases.

[ Test Plan ]

 * Note that libclang-rt-19 was not built on armhf in the current
   Noble package:
   https://launchpad.net/ubuntu/+source/llvm-toolchain-19/1:19.1.1-1ubuntu1~24.04.2/+build/29647779

 * Note that it is built in the PPA where I've tested this package:
   https://launchpad.net/~karljs/+archive/ubuntu/sru-llvm-19-noble/+build/32240944

[ Where problems could occur ]

 * LLVM 19 is used only by a small number of packages, as it's a
   universe package that is not the default version.

 * Some HWE and RISC-V kernels are built with LLVM 19, which means
   kernel updates could reveal bugs in this package.

[ Other Info ]

 * I've tested this build in a PPA here:
   https://launchpad.net/~karljs/+archive/ubuntu/sru-llvm-19-noble

 * The package includes recent changes made by Debian developers in
   their packaging.

 * This package also includes a small number of changes to packaging
   files that do not affect the build itself. This is because as I
   take on more maintainance of LLVM, I'm trying to manage the source
   code in a single place, with consistent tags and branches. You can
   see the code here:
   https://code.launchpad.net/~canonical-foundations/+git/llvm-toolchain

** Affects: llvm-toolchain-19 (Ubuntu)
     Importance: Medium
         Status: New

** Affects: llvm-toolchain-19 (Ubuntu Noble)
     Importance: Medium
         Status: New

** Changed in: llvm-toolchain-19 (Ubuntu)
   Importance: Undecided => Medium

** Also affects: llvm-toolchain-19 (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Changed in: llvm-toolchain-19 (Ubuntu Noble)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/2141360

Title:
  [SRU] include upstream fixes for libclang-rt-19-dev on armhf

Status in llvm-toolchain-19 package in Ubuntu:
  New
Status in llvm-toolchain-19 source package in Noble:
  New

Bug description:
  [ Impact ]

   * LLVM upstream has released 19.1.7, but our Noble package is still
     on 19.1.1

   * We have confirmed cases of users affected by bugs that are already
     fixed upstream. For example, see: pad.lv/2097731

   * The Noble package will now match what's already in later releases.

  [ Test Plan ]

   * Note that libclang-rt-19 was not built on armhf in the current
     Noble package:
     https://launchpad.net/ubuntu/+source/llvm-toolchain-19/1:19.1.1-1ubuntu1~24.04.2/+build/29647779

   * Note that it is built in the PPA where I've tested this package:
     https://launchpad.net/~karljs/+archive/ubuntu/sru-llvm-19-noble/+build/32240944

  [ Where problems could occur ]

   * LLVM 19 is used only by a small number of packages, as it's a
     universe package that is not the default version.

   * Some HWE and RISC-V kernels are built with LLVM 19, which means
     kernel updates could reveal bugs in this package.

  [ Other Info ]

   * I've tested this build in a PPA here:
     https://launchpad.net/~karljs/+archive/ubuntu/sru-llvm-19-noble

   * The package includes recent changes made by Debian developers in
     their packaging.

   * This package also includes a small number of changes to packaging
     files that do not affect the build itself. This is because as I
     take on more maintainance of LLVM, I'm trying to manage the source
     code in a single place, with consistent tags and branches. You can
     see the code here:
     https://code.launchpad.net/~canonical-foundations/+git/llvm-toolchain

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