i686_unknown_linux_musl.rs

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use target::{Target, TargetResult};

pub fn target() -> TargetResult {
    let mut base = super::linux_musl_base::opts();
    base.cpu = "pentium4".to_string();
    base.max_atomic_width = Some(64);
    base.pre_link_args.push("-m32".to_string());
    base.pre_link_args.push("-Wl,-melf_i386".to_string());

    // The unwinder used by i686-unknown-linux-musl, the LLVM libunwind
    // implementation, apparently relies on frame pointers existing... somehow.
    // It's not clear to me why nor where this dependency is introduced, but the
    // test suite does not pass with frame pointers eliminated and it passes
    // with frame pointers present.
    //
    // If you think that this is no longer necessary, then please feel free to
    // ignore! If it still passes the test suite and the bots then sounds good
    // to me.
    //
    // This may or may not be related to this bug:
    // https://llvm.org/bugs/show_bug.cgi?id=30879
    base.eliminate_frame_pointer = false;

    Ok(Target {
        llvm_target: "i686-unknown-linux-musl".to_string(),
        target_endian: "little".to_string(),
        target_pointer_width: "32".to_string(),
        data_layout: "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128".to_string(),
        arch: "x86".to_string(),
        target_os: "linux".to_string(),
        target_env: "musl".to_string(),
        target_vendor: "unknown".to_string(),
        options: base,
    })
}