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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
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Alexander Lanin
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1 Answers1

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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?)

hellow
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  • 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 – Alexander Lanin Nov 27 '18 at 14:57
  • The full error message would be helpful (and maybe worth another question). – hellow Nov 27 '18 at 15:01
  • Problem resolved by pointing OPENSSL_DIR to right place. Yes, i should make a new question for it. Thank you – Alexander Lanin Nov 27 '18 at 15:47