[Bug gdb/30008] gdb fails to get line numbers with gold/mold with --gdb-index

["rui314 at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30008

--- Comment #2 from Rui Ueyama <rui314 at gmail dot com> ---
I'm using "GNU gold (GNU Binutils for Ubuntu 2.38) 1.16" on Ubuntu 22.04.

You may want to apply the following patch to ensure you are using gold with
`--gdb-index`.

```
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3e0ae9ed..091835c5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,6 +55,8 @@ if(MOLD_USE_MOLD)
   add_link_options(-fuse-ld=mold -Wl,--gdb-index)
 endif()

+add_link_options(-fuse-ld=gold -Wl,--gdb-index)
+
 add_executable(mold)
 target_compile_features(mold PRIVATE cxx_std_20)
 target_link_libraries(mold PRIVATE ${CMAKE_DL_LIBS})
```

With this patch, I can reproduce the issue with the following commands:

$ git clone git@github.com:rui314/mold.git
$ cd mold
$ patch -p1 < patch.diff
$ mkdir build; cd build
$ cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_COMPILER=clang++-14 ..
$ cmake --build .
$ gdb ./mold -nx -batch -ex 'b parse_nonpositional_args' -ex 'run --no-fork
--no-threads' -ex bt -ex c -ex quit

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