The real issue is, that the .a files in the libunwind-dev package are
not stripped, and therefore the LTO information is kept in these files.
This is done by intent in the packaging. Trying to figure why ...
In the meantime the least invasive thing to do is to just rebuild with
GCC 11.4.
** Also affects: libunwind (Ubuntu Jammy)
Importance: Undecided
Status: New
** Also affects: llvm-toolchain-14 (Ubuntu Jammy)
Importance: Undecided
Status: New
** No longer affects: llvm-toolchain-14 (Ubuntu Jammy)
** Changed in: llvm-toolchain-14 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1997161
Title:
libunwind-dev has wrong LTO data
Status in libunwind package in Ubuntu:
Confirmed
Status in llvm-toolchain-14 package in Ubuntu:
Invalid
Status in libunwind source package in Jammy:
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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