使用cargo qemu进行build时报错

[leo-frank]

我在使用cargo qemu进行编译，显示了如下错误。
➜ [/home/wynn/Desktop/codes/rustsbi-qemu] git:(main) cargo qemu Finished dev [unoptimized + debuginfo] target(s) in 0.03s Runningtarget/debug/xtask qemuxtask: mode: Debug Compiling rustsbi v0.2.0-alpha.8 error: cannot find macroasmin this scope --> /home/wynn/.cargo/registry/src/mirrors.ustc.edu.cn-61ef6e0cd06fb9b8/rustsbi-0.2.0-alpha.8/src/privileged.rs:30:15 | 30 | () => asm!(" | ^^^ | = note: consider importing this macro: core::arch::asm
因此，我认为是rustsbi v0.2.0-alpha.8导致的编译错误。
这是我使用的toolchain 的情况：
`➜ [/home/wynn/Desktop/codes/rustsbi-qemu] git:(main) rustup show
Default host: x86_64-unknown-linux-gnu
rustup home: /home/wynn/.rustup

installed toolchains

stable-x86_64-unknown-linux-gnu
nightly-2018-09-18-x86_64-unknown-linux-gnu
nightly-2019-07-15-x86_64-unknown-linux-gnu
nightly-2020-05-01-x86_64-unknown-linux-gnu
nightly-2020-06-04-x86_64-unknown-linux-gnu
nightly-2020-06-27-x86_64-unknown-linux-gnu
nightly-2021-10-15-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu (default)

installed targets for active toolchain

riscv64imac-unknown-none-elf
x86_64-unknown-linux-gnu

active toolchain

nightly-x86_64-unknown-linux-gnu (overridden by '/home/wynn/Desktop/codes/rustsbi-qemu/rust-toolchain.toml')
rustc 1.59.0-nightly (475b00aa4 2021-12-24)`

奇怪的是，我在rustsbi的仓库下（https://github.com/rustsbi/rustsbi/）对rustsbi的最新版本0.2.0-alpha.9进行编译不会报错。
`
➜ [/home/wynn/Desktop/codes/rustsbi] git:(master) cargo build --target riscv64imac-unknown-none-elf

Compiling memchr v2.4.1
Compiling regex-syntax v0.6.25
Compiling lazy_static v1.4.0
Compiling nb v1.0.0
Compiling bit_field v0.10.1
Compiling void v1.0.2
Compiling bare-metal v1.0.0
Compiling nb v0.1.3
Compiling embedded-hal v0.2.6
Compiling aho-corasick v0.7.18
Compiling regex v1.5.4
Compiling riscv-target v0.1.2
Compiling riscv v0.7.0
Compiling rustsbi v0.2.0-alpha.9 (/home/wynn/Desktop/codes/rustsbi)
Finished dev [unoptimized + debuginfo] target(s) in 6.48s
并且编译rustsbi使用的toolchain和编译rustsbi-qemu时使用的toolchain相同：
➜ [/home/wynn/Desktop/codes/rustsbi] git:(master) rustup show
Default host: x86_64-unknown-linux-gnu
rustup home: /home/wynn/.rustup

installed toolchains

stable-x86_64-unknown-linux-gnu
nightly-2018-09-18-x86_64-unknown-linux-gnu
nightly-2019-07-15-x86_64-unknown-linux-gnu
nightly-2020-05-01-x86_64-unknown-linux-gnu
nightly-2020-06-04-x86_64-unknown-linux-gnu
nightly-2020-06-27-x86_64-unknown-linux-gnu
nightly-2021-10-15-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu (default)

installed targets for active toolchain

riscv64imac-unknown-none-elf
x86_64-unknown-linux-gnu

active toolchain

nightly-x86_64-unknown-linux-gnu (default)
rustc 1.59.0-nightly (475b00aa4 2021-12-24)
`