[Bug 2041694] [NEW] PAC -mbranch-protection causes seg faults and misbuilds

[Mark Esler]

Public bug reported:

In mantic, -mbranch-protection=standard is now a default dpkg compiler
flag for arm64 [0]. This breaks libunwind and dependencies [1]. This has
not affected any libunwind binaries, since rebuilds have not been
performed since this change.

>From local testing, the build will complete successfully, but tests will
report seg faults. Please make test failures cause FTBFS.

[0] https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/2040518
[1] https://github.com/libunwind/libunwind/issues/647

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

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https://bugs.launchpad.net/bugs/2041694

Title:
  PAC -mbranch-protection causes seg faults and misbuilds

Status in libunwind package in Ubuntu:
  New

Bug description:
  In mantic, -mbranch-protection=standard is now a default dpkg compiler
  flag for arm64 [0]. This breaks libunwind and dependencies [1]. This
  has not affected any libunwind binaries, since rebuilds have not been
  performed since this change.

  From local testing, the build will complete successfully, but tests
  will report seg faults. Please make test failures cause FTBFS.

  [0] https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/2040518
  [1] https://github.com/libunwind/libunwind/issues/647

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