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

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Shengjing Zhu (zhsj):

[ 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

** Affects: llvm-toolchain-18 (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: llvm-toolchain-18 (Ubuntu Noble)
     Importance: Undecided
         Status: Confirmed

** Affects: llvm-toolchain-18 (Ubuntu Oracular)
     Importance: Undecided
         Status: Fix Released

-- 
llvm-18-linker-tools does not include LLVMgold.so
https://bugs.launchpad.net/bugs/2064187
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