https://os.phil-opp.com/minimal-rust-kernel/#Target%20Specification

[utterances-bot]

A Minimal Rust Kernel | Writing an OS in Rust

https://os.phil-opp.com/minimal-rust-kernel/#Target%20Specification

[1600]

followed exact instructions, could not "cargo xbuild --target x86_64-blog_os.json". still "error[E0463]: can't find crate for core"

[phil-opp]

Hmm, do you have your code online somewhere so that I can test it? Are you seeing the "Compiling core v0.0.0 (file:///…/rust/src/libcore)" lines?

[1600]

I have the exact main.rs and Cargo.toml as yours, except maybe I'm on Windows 10. and no, I didnt see that line.

[phil-opp]

Could you give me the full output that you see? Maybe the problem is that you try to use a stable rust compiler instead of a nightly compiler.

[phil-opp]

@1600 Were you able to solve your problem?

[le-bananafish]

Hi, I think I might have the same problem. What should I comment for reduplication? Just for reference, I use the nightly compiler as my default.

[phil-opp]

Hi @le-bananafish,

could you give me the full command line output and the content of your main.rs?

[le-bananafish]

Hi @phil-opp

main.rs

#![no_std] // don't link the Rust standard library
#![no_main] // disable all Rust-level entry points

use core::panic::PanicInfo;

/// This function is called on panic.
#[panic_handler]
fn panic(_info: &PanicInfo) -> ! {
    loop {}
}

#[no_mangle] // don't mangle the name of this function
pub extern "C" fn _start() -> ! {
    // this function is the entry point, since the linker looks for a function
    // named `_start` by default
    loop {}
}

command output:

cargo xbuild --target os.json
   Compiling core v0.0.0 (C:\Users\Sebastian Lau\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\src\libcore)
    Finished release [optimized] target(s) in 25.44s
   Compiling compiler_builtins v0.1.0 (C:\Users\Sebastian Lau\.rustup\toolchains\nightly-x86_64-pc-windows-msvc\lib\rustlib\src\rust\src\libcompiler_builtins)
    Finished release [optimized] target(s) in 6.69s
   Compiling alloc v0.0.0 (C:\Users\SEBAST~1\AppData\Local\Temp\xargo.Y1tBY4X0UsYx)
    Finished release [optimized] target(s) in 4.52s
   Compiling kernel-starter-18-10-05 v0.1.0 (C:\Users\Sebastian Lau\Documents\Projects\kernel-starter-18-10-05)
error[E0463]: can't find crate for `core`
  |
  = note: the `os-15361375669166016168` target may not be installed

error: aborting due to previous error

For more information about this error, try `rustc --explain E0463`.
error: Could not compile `kernel-starter-18-10-05`.

To learn more, run the command again with --verbose.

I'm using the rls-plugin for vscode and it's also giving me this weird error:

{
	"resource": "/C:/Users/Sebastian Lau/Documents/Projects/kernel-starter-18-10-05/src/main.rs",
	"owner": "_generated_diagnostic_collection_name_#0",
	"code": "E0152",
	"severity": 8,
	"message": "duplicate lang item found: `panic_impl`.\n\nnote: first defined in crate `std`.",
	"source": "rustc",
	"startLineNumber": 8,
	"startColumn": 1,
	"endLineNumber": 10,
	"endColumn": 2
}

P.S. I haven't submitted code blocks on GitHub yet apologies for the formatting.

[phil-opp]

@le-bananafish Seems like you're running into rust-lang/cargo#6139, because your username contains a space. We tried our best to work around it, but we found no working way to escape the space. I hope that this gets fixed from the cargo side soon.

[le-bananafish]

@phil-opp Oh lol well that's a funny problem to have. I guess I shouldn't have put a space in my username...

Thanks anyway!

[phil-opp]

@le-bananafish You're welcome!

[phil-opp]

Closing this issue since there already exists a comment thread for the "A Minimal Rust Kernel" post.

@1600 If you're still having this problem please open a new issue!