[英]unknown feature `llvm_asm` when compile rust-src
I tried to compile rust-src using cargo xbuild but get this error:我尝试使用 cargo xbuild 编译 rust-src 但收到此错误:
error[E0635]: unknown feature `llvm_asm`
-> .cargo/registry/src/github.com-1ecc6299db9ec823/compiler_builtins-0.1.28/src/lib.rs:3:12
3 | #![feature(llvm_asm)]
How can I fix this error?我该如何解决这个错误? It's seem like xbuild tries to compile the new rust-src with an old rustc.
似乎 xbuild 试图用旧的 rustc 编译新的 rust-src。 I want it to also use the old rust-src.
我希望它也使用旧的 rust-src。
I can't update to a newer rustc version as it results in lots of "R_x86_32 relocation" errors, so I would prefer to use the 2020-03-24 version.我无法更新到较新的 rustc 版本,因为它会导致大量“R_x86_32 重定位”错误,因此我更愿意使用 2020-03-24 版本。
command命令
cargo new --bin test
rustup component add rust-src
cargo install cargo-xbuild
cd test
ls test
Cargo.toml rust-toolchain src x86_64-unknown-none.json
rust-toolchain生锈工具链
nightly-2020-03-24
x86_64-unknown-none.json x86_64-unknown-none.json
{
"llvm-target": "x86_64-unknown-none",
"data-layout": "e-m:e-i64:64-f80:128-n8:16:32:64-S128",
"arch": "x86_64",
"target-endian": "little",
"target-pointer-width": "64",
"target-c-int-width": "32",
"os": "none",
"executables": true,
"linker-flavor": "ld.lld",
"linker": "rust-lld",
"panic-strategy": "abort",
"disable-redzone": true,
"features": "-mmx,-sse,+soft-float"
}
src/main.rs src/main.rs
#![no_std] // don't link the Rust standard library
#![no_main] // disable all Rust-level entry points
#![allow(non_snake_case)] // disable non snake case name warning
use core::panic::PanicInfo;
#[no_mangle]
pub extern "C" fn _start() -> ! {
loop {}
}
#[panic_handler]
pub fn MyPacnicHandler(_panicInfo: &PanicInfo) -> ! {
loop {}
}
compile编译
cargo xbuild --target x86_64-unknown-none
rustc --version rustc --版本
rustc 1.44.0-nightly (1edd389cc 2020-03-23)
This is a bug in cargo-xbuild .这是cargo-xbuild中的一个错误。 Basically,
cargo xbuild
unconditionally fetches the latest compiler_builtins
.基本上,
cargo xbuild
无条件地获取最新的compiler_builtins
。
A patch has been merged, but is not yet in the latest crates.io
release.补丁已合并,但尚未在最新的
crates.io
版本中。 See this PR: https://github.com/rust-osdev/cargo-xbuild/pull/75/commits/eede1a1d4c08064763f1943c0920de2270260b33请参阅此 PR: https://github.com/rust-osdev/cargo-xbuild/pull/75/commits/eede1a1d4c08064763f1943c0920de2270260b33
Update your rust version by rustup update
, which works for me.通过
rustup update
更新您的 rust 版本,这对我有用。
The reason may be the feature rename in new version: https://github.com/rust-lang/rust/pull/71007原因可能是新版本中的功能重命名: https://github.com/rust-lang/rust/pull/71007
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