Cross compiling "python embedded in rust" binary (pyo3) for armv7

[124C41p]

Can your docker images (manylinux2014-cross or manylinux_2_28-cross) be used to cross compile a rust project for an armv7 machine which is using pyo3 to call python? If possible, I would prefer a static embedding of python into the binary.

Here is what I have tried so far:

1. Create a docker image based on manylinux2014-cross with rust toolchain installed

FROM messense/manylinux2014-cross:armv7
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
RUN /root/.cargo/bin/rustup target add armv7-unknown-linux-gnueabihf

2. Create a tiny rust project inside the corresponding docker container

Cargo.toml:

[package]
name = "foo"
version = "0.1.0"
edition = "2021"

[dependencies]
pyo3 = { version = "0.18.3", features = ["auto-initialize"] }

main.rs:

use pyo3::prelude::*;

fn main() -> PyResult<()> {
    Python::with_gil(|py| {
        let builtins = PyModule::import(py, "builtins")?;
        let total: i32 = builtins
            .getattr("sum")?
            .call1((vec![1, 2, 3],))?
            .extract()?;
        println!("{total}");
        Ok(())
    })
}

3. Build with PYO3_CROSS_PYTHON_VERSION=3.11 cargo build

The build fails due to a linker error: ld: cannot find -lpython3.11. It seems to me there is a python installation missing for the target system. Is there an easy way to fix that issue?

[messense]

You need to set PYO3_CROSS_LIB_DIR.

See https://pyo3.rs/v0.19.0/building_and_distribution.html?highlight=PYO3_CROSS_LIB_DIR#cross-compiling

[messense]

If possible, I would prefer a static embedding of python into the binary

See PyO3/pyo3#416