ld.lld: error: version script assignment of 'global' to symbol 'rtapi_app_exit' failed: symbol not defined

[NTULINUX]

Here are the steps I follow to reproduce the issue:

1. Build with Clang/LLD 19
2. Wait

This is what I expected to happen:

A successful compilation.

This is what happened instead:

ld.lld: error: version script assignment of 'global' to symbol 'rtapi_app_exit' failed: symbol not defined

It worked properly before this:

LLD recently changed their behavior to: --no-undefined-version by default:

https://reviews.llvm.org/D135402

Passing:

LDFLAGS="-Wl,--undefined-version" make works around the problem, however there should be a more proper fix.

Information about my hardware and software:

• I am using this Linux distribution and version (often, shown by lsb_release -a):
• I am using this kernel version (shown by uname -a): Linux ntu-gentoo 6.12.1-BUILD SMP Fri Nov 22 18:35:05 CST 2024 x86_64 AMD Ryzen 7 2700X Eight-Core Processor AuthenticAMD GNU/Linux
• I am running ...
  • A binary version from linuxcnc.org (including buildbot.linuxcnc.org)
  • A binary I built myself
  • A binary version from some other source besides linuxcnc.org
• I am using this LinuxCNC version (shown in package manager or, for git versions, scripts/get-version-from-git): Latest 2.9 or master checkout