Can't find crate for `std` error - new target

[fpichet]

Hi,

I am currently porting rust to a new target (out of tree). The host compiler run on Windows (msvc) and cross-compile to an embedded target.

I am at the point where I want to use the std that was built using: python x.py build --config opus_config.toml

I changed the default rustc using: rustup toolchain link opus3-octasic-opuskernel C:\git\sdt_rust\build\x86_64-pc-windows-msvc\stage1

Now if I build a project, I get this error:

C:\git\hello_world> cargo build

Compiling hello_world v0.1.0 (C:\git\hello_world)
error[E0463]: can't find crate for `std`

I tried using "rustup target add" but that doesn't seem to work.

I can see the std files (.rlib and stuff) for my target in: C:\git\sdt_rust\build\x86_64-pc-windows-msvc\stage1-std\opus3-octasic-opuskernel\release

How can I tell cargo to look there for std lib?

Thank you

[fee1-dead]

Have you tried asking on Zulip? There are more compiler people active there and it is easier to receive and provide help on there.

[bjorn3]

What is your opus_config.toml file? You probably need to add the host target to the target array to allow building build script and proc macros. Also you need cargo build --target opus3-octasic-opuskernel to build for this target. Rustc defaults to building for the host target.

[fpichet]

Turn out I just needed to add `--target opus3-octasic-opuskernel' on the cargo build.

Thank you.