貨物構建失敗：在此 scope 中找不到宏“llvm_asm”

Question

我正在嘗試構建rust-fractal-gui ，但構建總是失敗並出現以下錯誤：

$ cargo build --release

...

Compiling parking_lot v0.11.2
error: cannot find macro `llvm_asm` in this scope
  --> /home/riley/.cargo/registry/src/github.com-1ecc6299db9ec823/parking_lot-0.11.2/src/elision.rs:77:13
   |
77 |             llvm_asm!("xacquire; lock; cmpxchgq $2, $1"
   |             ^^^^^^^^

error: cannot find macro `llvm_asm` in this scope
   --> /home/riley/.cargo/registry/src/github.com-1ecc6299db9ec823/parking_lot-0.11.2/src/elision.rs:108:13
    |
108 |             llvm_asm!("xrelease; lock; xaddq $2, $1"
    |             ^^^^^^^^

error[E0635]: unknown feature `llvm_asm`
  --> /home/riley/.cargo/registry/src/github.com-1ecc6299db9ec823/parking_lot-0.11.2/src/lib.rs:14:42
   |
14 | #![cfg_attr(feature = "nightly", feature(llvm_asm))]
   |                                          ^^^^^^^^

For more information about this error, try `rustc --explain E0635`.
error: could not compile `parking_lot` due to 3 previous errors
warning: build failed, waiting for other jobs to finish...

rustup show的輸出：

rustup home:  /home/riley/.rustup

installed toolchains
--------------------

stable-x86_64-unknown-linux-gnu (default)
nightly-x86_64-unknown-linux-gnu
1.48.0-x86_64-unknown-linux-gnu

active toolchain
----------------

nightly-x86_64-unknown-linux-gnu (directory override for '/home/riley/projects/rust-fractal-gui')
rustc 1.64.0-nightly (c2f428d2f 2022-07-14)

我已經使用rustup update nightly將我的 nightly 工具鏈更新到最新版本，然后rustup override set nightly看到這個問題，但它沒有解決這個問題。

Answer 1

從rustc-nightly-2022-01-17 ，宏llvm_asm被刪除，取而代之的是新的asm宏。 rust-fractal-gui使用了一個過時的parking_lot版本，它仍然使用llvm_asm宏，導致了這個錯誤。 此后合並了一個PR以解決該問題。