Cannot build xv6-rust: failed to get allocator as a dependency of package

[anta40]

I'm on MacOS Big Sur with the latest nightly Rust installed:

$ rustc --version
rustc 1.60.0-nightly (bfe156467 2022-01-22)

I also already had another tools installed:

$ rustup target add riscv64gc-unknown-none-elf
$ cargo install cargo-binutils
$ rustup component add llvm-tools-preview

Now let's run make:

$ cd xv6-rust/kernel
make
...
...
error: failed to get allocator as a dependency of package kernel v0.1.0 (/Users/andre/Lab/OSDev/xv6-rust/kernel)

Caused by:
failed to load source for dependency allocator

Caused by:
Unable to update /Users/andre/Lab/OSDev/xv6-rust/allocator

Caused by:
failed to read /Users/andre/Lab/OSDev/xv6-rust/allocator/Cargo.toml

Caused by:
No such file or directory (os error 2)
make: *** [kernel] Error 101

[KuangjuX]

I'm guessing it's because the allocator's code isn't pulled down. Try to execute git submodule update --init --recursive to get the source code of the allocator crate.

[KuangjuX]

I have updated README.