extra DW_TAG_typedef layer in DWARF

I tried this code:

pub struct Example {
    value: i32
}
fn main() {
    let x = Example {value: 97};
}

Then I examined the DWARF using readelf -wi.

I see this:

 <1><5e>: Abbrev Number: 4 (DW_TAG_typedef)
    <5f>   DW_AT_name        : (indirect string, offset: 0x85): str::Example
    <63>   DW_AT_decl_file   : 1
    <64>   DW_AT_decl_line   : 1
    <65>   DW_AT_decl_column : 5
    <66>   DW_AT_type        : <0x6f>

However, I don't think having an extra DW_TAG_typedef here is very useful -- it just bloats the debuginfo without providing any extra useful information. Instead, I think the type itself ought to have a name.

Applying a hack to rust-gcc.cc:

diff --git a/gcc/rust/rust-gcc.cc b/gcc/rust/rust-gcc.cc
index f674fc8efb27..aa7e813167c3 100644
--- a/gcc/rust/rust-gcc.cc
+++ b/gcc/rust/rust-gcc.cc
@@ -933,12 +933,12 @@ Gcc_backend::named_type (const std::string &name, tree type, Location location)
       return type;
     }
 
-  tree copy = build_variant_type_copy (type);
+  // tree copy = build_variant_type_copy (type);
   tree decl = build_decl (location.gcc_location (), TYPE_DECL,
-                         get_identifier_from_string (name), copy);
-  DECL_ORIGINAL_TYPE (decl) = type;
-  TYPE_NAME (copy) = decl;
-  return copy;
+                         get_identifier_from_string (name), type);
+  // DECL_ORIGINAL_TYPE (decl) = type;
+  TYPE_NAME (type) = decl;
+  return type;
 }
 
 // Return the size of a type.

... makes it better:

 <1><5e>: Abbrev Number: 4 (DW_TAG_structure_type)
    <5f>   DW_AT_name        : (indirect string, offset: 0x85): str::Example
    <63>   DW_AT_byte_size   : 4
    <64>   DW_AT_sibling     : <0x73>
...

Note that gdb's rust support currently only works with the latter. While this could be fixed in gdb, I think there's not really a strong reason to.

I'm using git gccrs, commit 2f9f77f9dd6330fe60554400133d7217f78afa43.