rust compile x86 library on x86_64 machine

Question

I have ubuntu x86_64 container and cargo build goes well. But i need to build x86 library version too. As far as I understand i need to add i686 toolchain and target.

rustup target add i686-unknown-linux-gnu done successful

rustup toolchain install stable-i686-unknown-linux-gnu finished with error

$ rustup toolchain install stable-i686-unknown-linux-gnu
info: syncing channel updates for 'stable-i686-unknown-linux-gnu'
info: latest update on 2018-11-08, rust version 1.30.1 (1433507eb 2018-11-07)
info: downloading component 'rustc'
info: downloading component 'rust-std'
info: downloading component 'cargo'
info: downloading component 'rust-docs'
info: installing component 'rustc'
info: installing component 'rust-std'
info: installing component 'cargo'
info: installing component 'rust-docs'

  stable-i686-unknown-linux-gnu installed - (error reading rustc version)

and

$ rustup  default stable-i686
info: using existing install for 'stable-i686-unknown-linux-gnu'
info: default toolchain set to 'stable-i686-unknown-linux-gnu'

  stable-i686-unknown-linux-gnu unchanged - (error reading rustc version)

Do I missed something or took wrong approach?

hellow · Accepted Answer · 2018-11-27 15:53:06Z

4

Instead of changing your toolchain, you have to add the target to your current toolchain (make sure to switch back to your original toolchain first).

$ rustup target install i686-unknown-linux-gnu
$ cargo build --target=i686-unknown-linux-gnu

Of course, you need to install the 32-bit libraries on your system as well, e.g. on ubuntu you install them by

$ sudo apt install gcc-multilib

(for more information about that see How to Compile 32-bit Apps on 64-bit Ubuntu?)

edited Nov 27, 2018 at 15:53

answered Nov 27, 2018 at 9:52

hellow

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3 Comments

Alexander Lanin Over a year ago

Thank you. It was helpful. but I got stuck with the next step. error: failed to run custom build command for openssl-sys v0.9.39 Problem with x86_64 build I solved by installing libssl-dev But installing libssl-dev:i386 did not solve error on crosscompile. btw it is not Ubuntu i have. Debian stretch

hellow Over a year ago

The full error message would be helpful (and maybe worth another question).

Alexander Lanin Over a year ago

Problem resolved by pointing OPENSSL_DIR to right place. Yes, i should make a new question for it. Thank you

Alvin Smith · Accepted Answer · 2024-01-16 22:14:55Z

Bottom link is a great article. Also cargo make everything so easy.

cargo new --bin rust
     Created binary (application) `rust` package

cd rust
cargo run

   Compiling rust v0.1.0 (/home/user/Documents/rust)
    Finished dev [unoptimized + debuginfo] target(s) in 0.37s
     Running `target/debug/rust`
Hello, world!

cat ~/.cargo/config
───────┬────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
       │ File: /home/user/.cargo/config
───────┼────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
   1   │ [target.x86_64-unknown-linux-musl]
   2   │ linker = "x86_64-linux-gnu-gcc"
   3   │ 
   4   │ [target.x86_64-unknown-linux-gnu]
   5   │ linker = "x86_64-linux-gnu-gcc"
───────┴────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

cargo run
   Compiling rust v0.1.0 (/home/user/Documents/rust)
    Finished dev [unoptimized + debuginfo] target(s) in 0.10s
     Running `target/debug/rust`
I love programming.

cargo build --release --target x86_64-unknown-linux-musl
   Compiling rust v0.1.0 (/home/user/Documents/rust)
    Finished release [optimized] target(s) in 0.31s

https://burgers.io/cross-compile-rust-from-arm-to-x86-64

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