[Bug 1997161] [NEW] libunwind-dev has wrong LTO data

[Vladimir Dergachev]

Public bug reported:

When linking libunwind into my program I get the following message:

lto1: fatal error: bytecode stream in file '/usr/lib/gcc/x86_64-linux-
gnu/11/../../../x86_64-linux-gnu/libunwind-x86_64.a' generated with LTO
version 11.2 instead of the expected 11.3

LTO stands for link time optimization.

My guess is that libunwind-x86_64.a in Ubuntu repositories was compiled
with earlier gcc 11.2, but the gcc version on this new installation of
22.04 is 11.3.

I am not certain whether the right fix is to recompile with newer
compiler version, or to make the library without turning on link time
optimization options. libunwind is used for debugging, so there is no
obvious benefit in enabling link time optimization for this library.

** Affects: llvm-toolchain-14 (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  libunwind-dev has wrong LTO data

Status in llvm-toolchain-14 package in Ubuntu:
  New

Bug description:
  When linking libunwind into my program I get the following message:

  lto1: fatal error: bytecode stream in file '/usr/lib/gcc/x86_64-linux-
  gnu/11/../../../x86_64-linux-gnu/libunwind-x86_64.a' generated with
  LTO version 11.2 instead of the expected 11.3

  LTO stands for link time optimization.

  My guess is that libunwind-x86_64.a in Ubuntu repositories was
  compiled with earlier gcc 11.2, but the gcc version on this new
  installation of 22.04 is 11.3.

  I am not certain whether the right fix is to recompile with newer
  compiler version, or to make the library without turning on link time
  optimization options. libunwind is used for debugging, so there is no
  obvious benefit in enabling link time optimization for this library.

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