Cargo build vs. dfx build

Developers
1

I can build perfectly fine when I run cargo build in my Rust create.

Finished dev [unoptimized + debuginfo] target(s) in 0.08s

However, when I run dfx build in the same crate, I receive many type errors related to the libs serde and typenum.

I had to run rustup target add wasm32-unknown-unknown to resolve this. Do you know what is happening here?

Is cargo build doing something different than dfx build?

2

cargo build will compile for the default target, whereas dfx build compiles explicitly for the target wasm-unknown-unknown.

You can find the exact command in the source of dfx: sdk/src/dfx/src/lib/builders/rust.rs at 4346ed71594df5d37aac3b662964275ea5a3d1f3 · dfinity/sdk · GitHub

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