mac - can't cross build for any target

[avnerbarr]

reproduce

cd /tmp/
mkdir test
cd test
cargo init
cargo run
# prints hello world as expected

now try to cross build

(all of the following were tried)

cross build --target aarch64-unknown-linux-gnu
cross build --target i686-pc-windows-gnu
cross build --target powerpc-unknown-linux-gnu
cross build --target aarch64-unknown-linux-gnu

# a single example here 👇 

 cross build --target aarch64-unknown-linux-gnu
warning: toolchain '1.51.0-x86_64-unknown-linux-gnu' may not be able to run on this system.
warning: If you meant to build software to target that platform, perhaps try `rustup target add x86_64-unknown-linux-gnu` instead?
info: syncing channel updates for '1.51.0-x86_64-unknown-linux-gnu'
info: latest update on 2021-03-25, rust version 1.51.0 (2fd73fabe 2021-03-23)
info: downloading component 'cargo'
info: downloading component 'clippy'
info: downloading component 'rust-docs'
info: downloading component 'rust-std'
info: downloading component 'rustc'
info: downloading component 'rustfmt'
info: installing component 'cargo'
info: using up to 500.0 MiB of RAM to unpack components
info: installing component 'clippy'
info: installing component 'rust-docs'
 14.9 MiB /  14.9 MiB (100 %)   6.8 MiB/s in  1s ETA:  0s
info: rolling back changes
error: failed to install component: 'rust-docs-x86_64-unknown-linux-gnu', detected conflict: '"share/doc/rust/html/std/keyword.self.html"'
error: couldn't install toolchain `1.51.0-x86_64-unknown-linux-gnu`
caused by: `"rustup" "toolchain" "add" "1.51.0-x86_64-unknown-linux-gnu"` failed with exit code: Some(1)
note: run with `RUST_BACKTRACE=1` for a backtrace

My setup is:

rustup show
Default host: x86_64-apple-darwin
rustup home:  /Users/avner/.rustup

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

stable-x86_64-apple-darwin
nightly-x86_64-apple-darwin
1.50.0-x86_64-apple-darwin
1.51.0-x86_64-apple-darwin (default)

installed targets for active toolchain
--------------------------------------

x86_64-apple-darwin
x86_64-unknown-linux-gnu
x86_64-unknown-linux-musl

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

1.51.0-x86_64-apple-darwin (default)
rustc 1.51.0 (2fd73fabe 2021-03-23)


/tmp/avner$ cat ~/.rustup/settings.toml
default_toolchain = "1.51.0-x86_64-apple-darwin"
profile = "default"
version = "12"

[overrides]
/tmp/avner$

[olitha]

Hi, I don't know the details. But there is another issue open #522

As a workaround this worked for me. Install before compiling with cross the toolchain with minimal profile
rustup toolchain install --profile minimal stable-x86_64-unknown-linux-gnu

[avnerbarr]

I've installed that per your suggestion.

printing my tool chains I have

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

stable-x86_64-apple-darwin
stable-x86_64-unknown-linux-gnu
nightly-x86_64-apple-darwin
1.49.0-x86_64-apple-darwin
1.49.0-x86_64-unknown-linux-gnu
1.50.0-x86_64-apple-darwin
1.51.0-x86_64-apple-darwin (default)

installed targets for active toolchain
--------------------------------------

x86_64-apple-darwin
x86_64-unknown-linux-gnu
x86_64-unknown-linux-musl

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

1.51.0-x86_64-apple-darwin (default)
rustc 1.51.0 (2fd73fabe 2021-03-23)

but still getting a build error:

error: failed to install component: 'rust-docs-x86_64-unknown-linux-gnu', detected conflict: '"share/doc/rust/html/std/keyword.self.html"'

[jiayihu]

@olitha's suggestion worked for me too, maybe retry a clean install of rustup

[avnerbarr]

when I use the nightly it works:

/tmp/foo$ cross +nightly build --target x86_64-unknown-linux-musl

[Alexhuszagh]

I'd recommend doing a clean install, annoying but there's likely weird conflicts arising somewhere and I doubt this is specifically a cross issue, since this is effectively failing on rustup target add aarch64-unknown-linux-gnu.

[Alexhuszagh]

Closed since #522 has been merged, which fixes this.

when I use the nightly it works:

That's likely because nightly doesn't have all the components, so it doesn't try to install conflicting components.