[Bug 2082636] [NEW] [SRU] dpkg: backport frame-pointer enabling mechanism for Rust

[Zixing Liu]

Public bug reported:

[ Impact ]

 * On Noble, dpkg scripts could not produce Rust binaries with frame-
pointer enabled.

[ Test Plan ]

 * Randomly build a Rust binary package like ripgrep and you will not
find frame-pointers being used in the binary.

[ Where problems could occur ]

 * On older Rust versions, it is known that LLVM on s390x sometimes can produce incorrect warnings about how "backchain" feature does not exist.
 * On older LLVM versions, LLVM may not produce correct backchain saving logic inside the function prologue.

[ Other Info ]

 * This change is mandatory to enable Rust-related packages with frame-
pointers during the build.

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: New

** Merge proposal linked:
   https://code.launchpad.net/~liushuyu-011/ubuntu/+source/dpkg/+git/dpkg/+merge/473940

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https://bugs.launchpad.net/bugs/2082636

Title:
  [SRU] dpkg: backport frame-pointer enabling mechanism for Rust

Status in dpkg package in Ubuntu:
  New

Bug description:
  [ Impact ]

   * On Noble, dpkg scripts could not produce Rust binaries with frame-
  pointer enabled.

  [ Test Plan ]

   * Randomly build a Rust binary package like ripgrep and you will not
  find frame-pointers being used in the binary.

  [ Where problems could occur ]

   * On older Rust versions, it is known that LLVM on s390x sometimes can produce incorrect warnings about how "backchain" feature does not exist.
   * On older LLVM versions, LLVM may not produce correct backchain saving logic inside the function prologue.

  [ Other Info ]

   * This change is mandatory to enable Rust-related packages with
  frame-pointers during the build.

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