[Bug 2064187] Re: llvm-18-linker-tools does not include LLVMgold.so

[Shengjing Zhu]

FTR, the fix in Debian/Oracular is at
https://launchpad.net/ubuntu/+source/llvm-toolchain-18/1:18.1.5-1 and
https://launchpad.net/ubuntu/+source/llvm-toolchain-18/1:18.1.5-3

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https://bugs.launchpad.net/bugs/2064187

Title:
  llvm-18-linker-tools does not include LLVMgold.so

Status in llvm-toolchain-18 package in Ubuntu:
  Fix Released
Status in llvm-toolchain-18 source package in Noble:
  Confirmed
Status in llvm-toolchain-18 source package in Oracular:
  Fix Released

Bug description:
  [ Impact ]

  * User can't use clang++-18 to build C++ code with -flto option.

  [ Test Plan ]

  * Install clang-18 from proposed updates.
  * Try to build a C++ program with LTO (for example following the steps in original description.

  [ Where problems could occur ]

  * The missing LLVMgold.so is caused by switching to use mold in
  package building. Using mold is introduced in llvm 18. The fix is just
  to revert the change, and uses the same linker (gold) as old llvm
  versions. So the change looks safe.

  [ Other Info ]

  * No

  
  [Original Description]

  
  Unlike all other llvm-*-linker-tools packages, this one does not install `/usr/lib/llvm-18/lib/LLVMgold.so`. It does however install a broken symlink to it at `/usr/lib/bfd-plugins/LLVMgold-18.so`
  This results in compilation failures with clang++ when used with the `-flto` flag for link time optimization.

  To reproduce:

  main.cpp:
  ```c++
  int main() { return 0; }
  ```

  ```bash
  clang++ -flto main.cpp -o main
  ```

  Results in:
  ```
  /usr/bin/ld: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: error loading plugin: /usr/lib/llvm-18/bin/../lib/LLVMgold.so: cannot open shared object file: No such file or directory
  clang++: error: linker command failed with exit code 1 (use -v to see invocation)
  ```

  Package version is

  llvm-18-linker-tools/noble,now 1:18.1.3-1 amd64

  llvm-18-linker-tools:
    Installed: 1:18.1.3-1
    Candidate: 1:18.1.3-1
    Version table:
   *** 1:18.1.3-1 500
          500 http://de.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
          100 /var/lib/dpkg/status

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