[Bug symtab/28159] [gdb/symtab] gdb generates .gdb_index with only empty hashtable entries, then fails to recognize it as empty

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28159

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #0)
> This shows two problems:
> - gdb generates such an index

Fixed by:
...
diff --git a/gdb/dwarf2/index-write.c b/gdb/dwarf2/index-write.c
index 4e00c716d91..5de07a6c07b 100644
--- a/gdb/dwarf2/index-write.c
+++ b/gdb/dwarf2/index-write.c
@@ -1385,6 +1385,9 @@ write_gdbindex (dwarf2_per_objfile *per_objfile, FILE
*out_file,
   uniquify_cu_indices (&symtab);

   data_buf symtab_vec, constant_pool;
+  if (symtab.n_elements == 0)
+    symtab.data.resize (0);
+
   write_hash_table (&symtab, symtab_vec, constant_pool);

   write_gdbindex_1(out_file, objfile_cu_list, types_cu_list, addr_vec,
...

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