type is redefined

Input C/C++ Header

Header

#include "AeronArchive.h"

the actual header can be found here
https://github.com/real-logic/aeron/blob/1.41.4/aeron-archive/src/main/cpp/client/AeronArchive.h

Bindgen Invocation

bindgen code

    println!("cargo:rerun-if-changed=build.rs");
    println!("cargo:rerun-if-changed=bindings.h");

    let aeron_path = canonicalize(Path::new("./aeron")).unwrap();
    let header_path = aeron_path.join("aeron-archive/src/main/cpp/client");
    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());

    let cmake_output = Config::new(&aeron_path)
        .build();

    let base_lib_dir = cmake_output.join("build");
    println!(
        "cargo:rustc-link-search=native={}",
        base_lib_dir.join("lib").display()
    );
    // Because the `cmake_output` path is different for debug/release, we're not worried
    // about accidentally linking the Debug library when this is a release build or vice-versa
    println!(
        "cargo:rustc-link-search=native={}",
        base_lib_dir.join("lib/Debug").display()
    );
    println!(
        "cargo:rustc-link-search=native={}",
        base_lib_dir.join("binaries/Debug").display()
    );
    println!(
        "cargo:rustc-link-search=native={}",
        base_lib_dir.join("lib/Release").display()
    );
    println!(
        "cargo:rustc-link-search=native={}",
        base_lib_dir.join("binaries/Release").display()
    );

    println!("cargo:rustc-link-lib=static=aeron_archive_client");
    println!("cargo:rustc-link-lib=static=aeron_archive_client_wrapper");
    println!("cargo:rustc-link-lib=stdc++");

    println!("cargo:include={}", header_path.display());
    let bindings = bindgen::Builder::default()
        .clang_arg(format!("-I{}", header_path.display()))
        .clang_arg(format!(
            "-I{}",
            aeron_path.join("aeron-client/src/main/c").display()
        ))
        .header("bindings.h")
        .enable_cxx_namespaces()
        // enable C++
        .clang_args(&["-x", "c++", "--std=c++14"])
        .opaque_type("std::.*")
        .constified_enum_module("aeron_.*_enum")
        .derive_debug(false)
        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
        .generate()
        .expect("Unable to generate aeron bindings");

    bindings
        .write_to_file(out_path.join("bindings.rs"))
        .expect("Couldn't write bindings!");

Actual Results

error

error[E0428]: the name `this_t` is defined multiple times
     --> /home/alex/workspaces/personal/aeron-lib/target/debug/build/libaeron_archive-sys-0a7352ee9f461a4a/out/bindings.rs:10595:5
      |
10115 |     pub type this_t = root::aeron::concurrent::logbuffer::BufferClaim;
      |     ------------------------------------------------------------------ previous definition of the type `this_t` here
...
10595 |     pub type this_t = root::aeron::ChannelUri;
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `this_t` redefined here
      |
      = note: `this_t` must be defined only once in the type namespace of this module

error[E0428]: the name `this_t` is defined multiple times
     --> /home/alex/workspaces/personal/aeron-lib/target/debug/build/libaeron_archive-sys-0a7352ee9f461a4a/out/bindings.rs:10597:5
      |
10115 |     pub type this_t = root::aeron::concurrent::logbuffer::BufferClaim;
      |     ------------------------------------------------------------------ previous definition of the type `this_t` here
...
10597 |     pub type this_t = root::aeron::archive::client::Context;
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `this_t` redefined here
      |
      = note: `this_t` must be defined only once in the type namespace of this module

error[E0428]: the name `this_t` is defined multiple times
     --> /home/alex/workspaces/personal/aeron-lib/target/debug/build/libaeron_archive-sys-0a7352ee9f461a4a/out/bindings.rs:10598:5
      |
10115 |     pub type this_t = root::aeron::concurrent::logbuffer::BufferClaim;
      |     ------------------------------------------------------------------ previous definition of the type `this_t` here
...
10598 |     pub type this_t = root::aeron::BufferBuilder;
      |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `this_t` redefined here
      |
      = note: `this_t` must be defined only once in the type namespace of this module

generated file

// skip other line....
    pub type this_t = root::aeron::ChannelUri;
    pub type this_t = root::aeron::archive::client::Context;
    pub type this_t = root::aeron::BufferBuilder;
}

Expected Results

no redefined type

Reproduce generation from build.rs using bindings.h and AeronArchive.h, then inspect the generated bindings.rs entries where multiple pub type this_t definitions appear. Trace bindgen's C++ namespace handling and type-name generation, and consider the issue done when the same invocation produces bindings.rs without duplicate Rust type definitions.