加载目标规范时出错:无法找到目标规范

Question

我正在按照本教程学习如何在Rust中创建一个非常基本的操作系统.这是我目前的状态:

Cargo.toml

[package]
name = "blog_os"
version = "0.1.0"
authors = ["Philipp Oppermann <dev@phil-opp.com>"]   # Here I used my own details

[lib]
crate-type = ["staticlib"]

SRC/lib.rs

#![feature(lang_items)]
#![no_std]

#[no_mangle]
pub extern fn rust_main() {}

#[lang = "eh_personality"] extern fn eh_personality() {}
#[lang = "panic_fmt"] #[no_mangle] pub extern fn panic_fmt() -> ! {loop{}}

x86_64的-blog_os.json

{
  "llvm-target": "x86_64-unknown-none",
  "data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
  "linker-flavor": "gcc",
  "target-endian": "little",
  "target-pointer-width": "64",
  "target-c-int-width": "32",
  "arch": "x86_64",
  "os": "none",
  "disable-redzone": true,
  "features": "-mmx,-sse,+soft-float"
}

这是Makefile.

---

如果向下滚动到教程中的Fixing Linker Errors部分,我们基本上要求我们添加以下行Cargo.toml:

[dependencies]
rlibc = "1.0"

然后在lib.rs(之后#![no_std])指定外部包:

extern crate rlibc;

当我make run在终端中运行时,收到以下错误消息:

error: Error loading specification: Could not find specification for target "x86_64-blog_os" 

error: Could not compile 'rlibc'

我们预计会出现错误...而不是这个错误." 修复链接器错误"部分中的示例提供了我们应该期望的错误类型的概念.

可能出现什么问题？我在谷歌的任何地方搜索都没有解决方案.

Answer 1

我有同样的问题.Xargo和Cargo上的这些问题似乎表明目标规范的位置有一个错误:

• https://github.com/japaric/xargo/issues/44
• https://github.com/rust-lang/cargo/issues/4865

RUST_TARGET_PATH=pwd在调用之前设置xargo为我修复了问题.给定Makefile中的调用将如下所示:

@RUST_TARGET_PATH=$(shell pwd) xargo build --target $(target)