I've managed to compile stage1 rustc and cargo (stage1 cargo is build only when I compile stage2 for some reason) after reading through How to build and run the compiler - Rust Compiler Development Guide.
bootstrap.toml:
# See bootstrap.example.toml for documentation of available options
#
profile = "compiler" # Includes one of the default files in src/bootstrap/defaults
change-id = 140732
[build]
build = "x86_64-unknown-linux-gnu"
host = ["x86_64-unknown-linux-gnu"]
target = ["x86_64-unknown-linux-gnu", "thumbv7em-none-eabi"]
extended = true
build-stage = 2
#tools = ["cargo"]
I'm trying to make a toolchain that I can use to cargo build a no-std crate for embedded thumbv7em-none-eabi target.
$ rustup toolchain link stage1 build/host/stage1
$ cargo build
error: 'cargo' is not installed for the custom toolchain 'stage1'.
note: this is a custom toolchain, which cannot use `rustup component add`
help: if you built this toolchain from source, and used `rustup toolchain link`, then you may be able to build the component with `x.py`
From what I understand I'd need something like stage1-sysroot but I can't find any mention of such thing.
What am I missing?
If this is not the right place to ask this question I'd appreciate somebody pointing me to one.