Target triple and conditional compilation for Android

help
1

Hello,

I have a library which has a section I do not want to build when compiling for Android, I used target_os = "android" to detect this at compile time. However, my approach still fails. I have attached the relevant code and the list of targets below.

Conditional compilation code

#[cfg(
    all(
        not(feature = "pure-rust"),
        any(target_arch = "x86_64", target_arch = "aarch64"),
        not(any(target_os="android", target_os="androideabi",
                target_os="ios"))
    )
)]

For when "pure-rust" feature is not specified, and architecture is supported, and not on android or ios.

#[cfg(
    not(
        all(
            not(feature = "pure-rust"),
            any(target_arch = "x86_64", target_arch = "aarch64"),
            not(any(target_os="android", target_os="androideabi",
                    target_os="ios"))
        )
    )
)]

For when "pure-rust" feature is specified, or architecture is not supported, or target_os is not supported. Just a negation of above one.

Target I have trouble with

  • aarch64-linux-android

My confusion

target_os of the above target should yield android right?

Additional questions

For armv7-linux-androideabi, is target_os = "androideabi"?
For i686-linux-android, is target_os = "android"

Full context

This question originated from this issue and I'm trying to fix it in this PR.

Thanks,
Darren

2

Hmm, looks alright to me, not sure why it's not working.

For armv7-linux-androideabi , target_os = "android"

1 Like
3

I faced similar issues that the community helped resolve- see https://www.reddit.com/r/rust/comments/9yve3r/how_to_detect_if_im_on_a_raspberry_pi/

Specifically in your code above, I could not get "aarch64" or "aarch32" to detect in any formulation to detect a Raspberry Pi 3B+. But checking other values worked as expected based on the compiler target.

1 Like