error[E0463]: can't find crate for core

[pioneerlfn]

when run "cargo build" within blog-02,
it reports "can't find crate for core

i have already used nightly.

blog_os git:(post-02) rustc --version
rustc 1.46.0-nightly (346aec9b0 2020-07-11)

[bjorn3]

You need to use cargo xbuild, not cargo build.

[pioneerlfn]

You need to use cargo xbuild, not cargo build.

when run cargo xbuild, error still reported:

error[E0461]: couldn't find crate `core` with expected target triple x86_64-blog_os-10958214645806601562

[bjorn3]

Run cargo clean once. After that cargo xbuild should work fine.

[pioneerlfn]

Run cargo clean once. After that cargo xbuild should work fine.

thanks for helping me so patiently!
i did as what you said, but the error still exsits, as follows:

  blog_os git:(post-02) cargo clean
➜  blog_os git:(post-02) cargo xbuild
   Compiling compiler_builtins v0.1.32
   Compiling core v0.0.0 (/home/lfn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore)
   Compiling rustc-std-workspace-core v1.99.0 (/home/lfn/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/tools/rustc-std-workspace-core)
   Compiling alloc v0.0.0 (/tmp/cargo-xbuildkSeMac)
    Finished release [optimized] target(s) in 12.42s
   Compiling bootloader v0.9.8
   Compiling rlibc v1.0.0
error[E0461]: couldn't find crate `core` with expected target triple x86_64-blog_os-10958214645806601562
  |
  = note: the following crate versions were found:
          crate `core`, target triple x86_64-blog_os-6028079494216025267: /home/lfn/Documents/rust/projects/blog_os/target/sysroot/lib/rustlib/x86_64-blog_os/lib/libcore-8db6693f79383387.rmeta
          crate `core`, target triple x86_64-blog_os-6028079494216025267: /home/lfn/Documents/rust/projects/blog_os/target/sysroot/lib/rustlib/x86_64-blog_os/lib/libcore-8db6693f79383387.rlib

error: aborting due to previous error

error: could not compile `rlibc`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed

[bjorn3]

Strange. I don't know what could be the problem.

[pioneerlfn]

Strange. I don't know what could be the problem.

thx all the same~~

[phil-opp]

Sorry for the confusion all! I just updated the blog to use standard cargo build instead of cargo-xbuild in #835. However, this only works on the latest nightlies, so this is likely the problem here.

On https://os.phil-opp.com/minimal-rust-kernel/#building-our-kernel I put some note about this:

Note: The unstable.build-std configuration key requires at least the Rust nightly from 2020-07-15. Right now, the rustfmt component is not available on these recent nightlies, so you might need to use rustup update nightly --force to update your nightly, which skips the rustfmt component if it's not available.

I will also add this note to the Readme to try to prevent this confusion in the future.

[phil-opp]

I will also add this note to the Readme to try to prevent this confusion in the future.

Done.

[pioneerlfn]

Sorry for the confusion all! I just updated the blog to use standard cargo build instead of cargo-xbuild in #835. However, this only works on the latest nightlies, so this is likely the problem here.

On https://os.phil-opp.com/minimal-rust-kernel/#building-our-kernel I put some note about this:

Note: The unstable.build-std configuration key requires at least the Rust nightly from 2020-07-15. Right now, the rustfmt component is not available on these recent nightlies, so you might need to use rustup update nightly --force to update your nightly, which skips the rustfmt component if it's not available.

I will also add this note to the Readme to try to prevent this confusion in the future.

It works!
Thx a lot!!