cross compile from linux to win produces a wheel that crashes silently at runtime

[oscar6echo]

Bug Description

The cross compile from linux to windows of package polars_plugin_option_pricing produces a wheel.
This wheel can be pip installed on windows.
So far no apparent error or warning.

But at runtime, the program exits silently without error message when reaching the compiled module: polars_plugin_option_pricing._rust.

I tried to build the wheel on a linux host (ubuntu) and from inside a docker container (reproducible below).
I build the docker container on a ubuntu host and a redhat8 host.
Same result :-(

How to debug this ?
Is there a tested template of docker based cross compilation from linux to win somewhere in the docs ?

Note: the native and manylinux compilations work and produce working wheels.

Your maturin version (maturin --version)

1.7.4

Your Python version (python -V)

3.12

Your pip version (pip -V)

24.3.1

What bindings you're using

pyo3

Does cargo build work?

• Yes, it works

If on windows, have you checked that you aren't accidentally using unix path (those with the forward slash /)?

• Yes

Steps to Reproduce

Commands on linux host:

git clone https://github.com/oscar6echo/polars-plugin-option-pricing.git
cd polars-plugin-option-pricing
docker build -t builder-win:local -f ./win.Dockerfile .
docker run --rm -v "$(pwd)":/io builder-win:local      

docker run logs:

# from repo root
❯ docker run --rm -v "$(pwd)":/io builder-win:local      
    Updating crates.io index
 Downloading crates ...
  Downloaded serde v1.0.214
  Downloaded strum_macros v0.26.4
  Downloaded wasi v0.11.0+wasi-snapshot-preview1
  Downloaded compact_str v0.8.0
  Downloaded cc v1.1.31
  Downloaded castaway v0.2.3
  Downloaded bytes v1.8.0
  Downloaded bytemuck_derive v1.5.0
  Downloaded bytemuck v1.14.3
  Downloaded bitflags v2.4.2
  Downloaded memoffset v0.9.0
  Downloaded atoi_simd v0.15.6
  Downloaded array-init-cursor v0.2.0
  Downloaded argminmax v0.6.2
  Downloaded windows-targets v0.52.6
  Downloaded windows-targets v0.48.5
  Downloaded aho-corasick v1.1.2
  Downloaded windows_aarch64_gnullvm v0.48.5
  Downloaded syn v2.0.87
  Downloaded windows_aarch64_gnullvm v0.52.6
  Downloaded redox_syscall v0.4.1
  Downloaded regex v1.10.3
  Downloaded iter-read v0.3.1
  Downloaded windows_i686_gnullvm v0.52.6
  Downloaded polars-core v0.43.1
  Downloaded polars-arrow v0.43.1
  Downloaded windows_x86_64_gnullvm v0.48.5
  Downloaded libc v0.2.153
  Downloaded windows_x86_64_gnullvm v0.52.6
  Downloaded fast-float v0.2.0
  Downloaded regex-syntax v0.8.5
  Downloaded zerocopy-derive v0.7.32
  Downloaded zerocopy v0.7.32
  Downloaded version_check v0.9.4
  Downloaded scopeguard v1.2.0
  Downloaded windows_i686_gnu v0.48.5
  Downloaded windows_i686_gnu v0.52.6
  Downloaded windows_i686_msvc v0.52.6
  Downloaded windows_x86_64_gnu v0.48.5
  Downloaded windows_x86_64_msvc v0.48.5
  Downloaded windows_x86_64_msvc v0.52.6
  Downloaded xxhash-rust v0.8.10
  Downloaded wasm-bindgen-shared v0.2.91
  Downloaded wasm-bindgen-macro-support v0.2.91
  Downloaded wasm-bindgen-macro v0.2.91
  Downloaded wasm-bindgen-backend v0.2.91
  Downloaded wasm-bindgen v0.2.91
  Downloaded unindent v0.2.3
  Downloaded unicode-ident v1.0.12
  Downloaded thiserror-impl v2.0.0
  Downloaded thiserror-impl v1.0.57
  Downloaded thiserror v2.0.0
  Downloaded thiserror v1.0.57
  Downloaded target-lexicon v0.12.16
  Downloaded strength_reduce v0.2.4
  Downloaded streaming-iterator v0.1.9
  Downloaded streaming-decompression v0.1.2
  Downloaded stacker v0.1.15
  Downloaded smallvec v1.13.1
  Downloaded serde-pickle v1.1.1
  Downloaded regex-automata v0.4.5
  Downloaded simdutf8 v0.1.4
  Downloaded ryu v1.0.17
  Downloaded rustversion v1.0.14
  Downloaded windows_x86_64_gnu v0.52.6
  Downloaded windows_i686_msvc v0.48.5
  Downloaded windows_aarch64_msvc v0.52.6
  Downloaded windows_aarch64_msvc v0.48.5
  Downloaded winapi v0.3.9
  Downloaded crossbeam-utils v0.8.20
  Downloaded polars-ffi v0.43.1
  Downloaded option-pricing v0.1.4
  Downloaded multiversion-macros v0.7.3
  Downloaded recursive-proc-macro-impl v0.1.1
  Downloaded recursive v0.1.1
  Downloaded rayon v1.9.0
  Downloaded raw-cpuid v11.0.1
  Downloaded python3-dll-a v0.2.9
  Downloaded pyo3-macros-backend v0.22.5
  Downloaded pyo3-macros v0.22.5
  Downloaded pyo3-polars-derive v0.11.0
  Downloaded pyo3-polars v0.17.0
  Downloaded pyo3-ffi v0.22.5
  Downloaded pyo3-build-config v0.22.5
  Downloaded multiversion v0.7.3
  Downloaded pyo3 v0.22.5
  Downloaded psm v0.1.23
  Downloaded portable-atomic v1.9.0
  Downloaded polars-utils v0.43.1
  Downloaded polars-plan v0.43.1
  Downloaded polars-compute v0.43.1
  Downloaded itertools v0.13.0
  Downloaded hashbrown v0.14.5
  Downloaded rand_core v0.6.4
  Downloaded quote v1.0.35
  Downloaded winapi-i686-pc-windows-gnu v0.4.0
  Downloaded ppv-lite86 v0.2.17
  Downloaded polars-schema v0.43.1
  Downloaded polars-row v0.43.1
  Downloaded polars-ops v0.43.1
  Downloaded polars-mem-engine v0.43.1
  Downloaded polars-lazy v0.43.1
  Downloaded polars-io v0.43.1
  Downloaded polars-expr v0.43.1
  Downloaded bumpalo v3.15.1
  Downloaded polars-error v0.43.1
  Downloaded polars-arrow-format v0.1.0
  Downloaded planus v0.3.1
  Downloaded parquet-format-safe v0.2.4
  Downloaded parking_lot_core v0.9.9
  Downloaded parking_lot v0.12.1
  Downloaded winapi-x86_64-pc-windows-gnu v0.4.0
  Downloaded num-traits v0.2.18
  Downloaded num-integer v0.1.46
  Downloaded polars v0.43.1
  Downloaded memmap2 v0.7.1
  Downloaded memchr v2.7.1
  Downloaded log v0.4.20
  Downloaded lock_api v0.4.11
  Downloaded libm v0.2.8
  Downloaded js-sys v0.3.68
  Downloaded polars-parquet v0.43.1
  Downloaded itoa v1.0.10
  Downloaded indoc v2.0.4
  Downloaded heck v0.5.0
  Downloaded glob v0.3.1
  Downloaded windows-sys v0.52.0
  Downloaded target-features v0.1.5
  Downloaded getrandom v0.2.12
  Downloaded fallible-streaming-iterator v0.1.9
  Downloaded ethnum v1.5.0
  Downloaded either v1.13.0
  Downloaded dyn-clone v1.0.16
  Downloaded crossbeam-epoch v0.9.18
  Downloaded crossbeam-deque v0.8.5
  Downloaded chrono v0.4.34
  Downloaded byteorder v1.5.0
  Downloaded syn v1.0.109
  Downloaded bitflags v1.3.2
  Downloaded base64 v0.22.1
  Downloaded allocator-api2 v0.2.16
  Downloaded ahash v0.8.9
  Downloaded static_assertions v1.1.0
  Downloaded shlex v1.3.0
  Downloaded serde_derive v1.0.214
  Downloaded rayon-core v1.12.1
  Downloaded rand_distr v0.4.3
  Downloaded rand_chacha v0.3.1
  Downloaded rand v0.8.5
  Downloaded proc-macro2 v1.0.89
  Downloaded percent-encoding v2.3.1
  Downloaded once_cell v1.19.0
  Downloaded num-bigint v0.4.4
  Downloaded indexmap v2.2.3
  Downloaded home v0.5.9
  Downloaded equivalent v1.0.1
  Downloaded cfg-if v1.0.0
  Downloaded autocfg v1.1.0
🍹 Building a mixed python/rust project
🔗 Found pyo3 bindings with abi3 support for Python ≥ 3.8
🐍 Not using a specific python interpreter (Automatically generating windows import library)
   Compiling pyo3-build-config v0.22.5
   Compiling pyo3-ffi v0.22.5
   Compiling pyo3-macros-backend v0.22.5
   Compiling pyo3 v0.22.5
   Compiling pyo3-macros v0.22.5
   Compiling pyo3-polars v0.17.0
   Compiling polars-plugin-option-pricing v0.1.0 (/io)
    Finished `release` profile [optimized] target(s) in 1m 24s
📦 Including files matching "src/**/*.rs"
📦 Built wheel for abi3 Python ≥ 3.8 to /io/dist/docker/polars_plugin_option_pricing-0.1.0-cp38-abi3-win_amd64.whl

Commands on win host, in conda env with py3.12:

pip install polars_plugin_option_pricing-0.1.0-cp38-abi3-win_amd64.whl

# from repo root
python test-run-bs.py

This command outputs:

polars_plugin_option_pricing version: 0.1.0
START

LAP init: 0.019 s
shape: (10_000_000, 7)
┌─────────┬───────┬────────┬──────┬─────┬──────┬──────┐
│ is_call ┆ spot  ┆ strike ┆ mat  ┆ vol ┆ rate ┆ div  │
│ ---     ┆ ---   ┆ ---    ┆ ---  ┆ --- ┆ ---  ┆ ---  │
│ bool    ┆ f32   ┆ f32    ┆ f32  ┆ f32 ┆ f32  ┆ f32  │
╞═════════╪═══════╪════════╪══════╪═════╪══════╪══════╡
│ true    ┆ 80.0  ┆ 80.0   ┆ 1.0  ┆ 0.1 ┆ 0.0  ┆ 0.0  │
│ true    ┆ 80.0  ┆ 80.0   ┆ 1.0  ┆ 0.1 ┆ 0.0  ┆ 0.01 │
│ true    ┆ 80.0  ┆ 80.0   ┆ 1.0  ┆ 0.1 ┆ 0.0  ┆ 0.02 │
│ true    ┆ 80.0  ┆ 80.0   ┆ 1.0  ┆ 0.1 ┆ 0.0  ┆ 0.03 │
│ true    ┆ 80.0  ┆ 80.0   ┆ 1.0  ┆ 0.1 ┆ 0.0  ┆ 0.04 │
│ …       ┆ …     ┆ …      ┆ …    ┆ …   ┆ …    ┆ …    │
│ false   ┆ 120.0 ┆ 120.0  ┆ 10.0 ┆ 0.5 ┆ 0.04 ┆ 0.03 │
│ false   ┆ 120.0 ┆ 120.0  ┆ 10.0 ┆ 0.5 ┆ 0.04 ┆ 0.04 │
│ false   ┆ 120.0 ┆ 120.0  ┆ 10.0 ┆ 0.5 ┆ 0.04 ┆ 0.05 │
│ false   ┆ 120.0 ┆ 120.0  ┆ 10.0 ┆ 0.5 ┆ 0.04 ┆ 0.06 │
│ false   ┆ 120.0 ┆ 120.0  ┆ 10.0 ┆ 0.5 ┆ 0.04 ┆ 0.07 │
└─────────┴───────┴────────┴──────┴─────┴──────┴──────┘
10,000,000
LAP cross: 0.099 s
--------------------------------------------------
SHAPE_INPUT: cols
--------------------------------------------------

The program should continue (cf demo notebook run-bs.ipynb), but exits without showing any indication what the error was...

[messense]

Have you tried reproduce it directly on Windows w/o cross compilation?

[oscar6echo]

I did try maturin build --release but ran into the following error.
It complains that gcc is not installed, but it is (winlibs.com).

NOTE: it's a corp windows machine it is quite constrained with no admin rights. This is one reason, besides convenience, I try to buid all wheels from linux. For example maturin develop is blocked by a symantec "anti virus" that prevents writing an .exe in folder polars_plugin_option_pricing/target. Of course these problems are out of scope in this discussion.

Btw thx for the fast reply.

[oscar6echo]

I keep searching and just found that if I cross compile without PolarsAllocator (as below), then it does work !
But the performance is very poor:

• ~4 times slower !
• 4s to run run-bs.py (10m prices) vs. 1s with on a similarly sized linux machine.

mod black_scholes;
mod implied_vol;
// use pyo3_polars::PolarsAllocator;

use pyo3::types::{PyModule, PyModuleMethods};
use pyo3::{pymodule, Bound, PyResult};

#[pymodule]
fn _rust(m: &Bound<'_, PyModule>) -> PyResult<()> {
    m.add("__version__", env!("CARGO_PKG_VERSION"))?;
    Ok(())
}

// #[global_allocator]
// static ALLOC: PolarsAllocator = PolarsAllocator::new();

It seems PolarAllocator is defined there in repo pyo3-polars.

What could be so toxic in it that produces a silent crash ?

[messense]

Maybe it's hitting this https://github.com/pola-rs/pyo3-polars/blob/a6a37eff1ac65fe8935aef960e53902f9db7f041/pyo3-polars/src/alloc.rs#L79-L86 ?

You can build a debug wheel with maturin build --profile dev.

[oscar6echo]

You're right 👍

Running maturin build --profile dev I get this error:

Side question: Is it always true that running maturin build --profile dev will disclose all potentially hidden errors ?

[messense]

Is it always true that running maturin build --profile dev will disclose all potentially hidden errors ?

No, the error appears because the code is cfged with debug_assertions which means it won't be compiled in release mode. And looks like it currently does not support Windows correctly.

[oscar6echo]

Ok thx for your fast and insightful answers 👍

[oscar6echo]

Ref issue pola-rs/pyo3-polars#117

[oscar6echo]

Now I'm trying to cross compile from linux to windows with target x86_64-pc-windows-msvc.
(To see how compilation behaves in this case)

I do it inside a docker container.
The commands is:
maturin build -m /io/Cargo.toml --release --target x86_64-pc-windows-msvc --out /io/dist
And packages cargo-xwin and maturin were pip install-ed.
And the toolchain x86_64-pc-windows-msvc was a added with rustup add target x86_64-pc-windows-msvc

Compilation fails with error:

Caused by: https://aka.ms/vs/16/release/channel: Provided proxy credentials are incorrect

This container runs inside a corp network and internet is only accessible through a proxy.
I checked that env variables HTTP_PROXY and HTTPS_PROXY are properly set indeed.

How to let cargo to go fetch data through the proxy defined by these env variables ? if possible ?
I recognize this is not easy to realize or check from outside a corp...

[oscar6echo]

I just tried run the docker container outside corp:

FROM python:3.12-slim-bullseye

# ref https://learn.microsoft.com/en-us/vcpkg/users/platforms/mingw#mingw-cross
RUN apt-get update -y && \
    apt-get install -y curl wget vim build-essential

RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV PATH=/root/.cargo/bin:$PATH
RUN rustup target add x86_64-pc-windows-msvc

RUN python -m pip install --no-cache-dir -U pip && \
    python -m pip install --no-cache-dir cargo-xwin && \
    python -m pip install --no-cache-dir maturin

ENV XWIN_CACHE_DIR=/io/cache

WORKDIR /io
COPY ./maturin-build-win-msvc.sh .
ENTRYPOINT [ "/io/maturin-build-win-msvc.sh" ]

where maturin-build-win-msvc.sh is:

#! /bin/bash

maturin build -m /io/Cargo.toml --release --target x86_64-pc-windows-msvc --out /io/dist/docker-msvc

But I get this error:

docker run --rm -v "$(pwd)":/io builder-win-msvc:local
    Updating crates.io index
 Downloading crates ...
  Downloaded ahash v0.8.9
  Downloaded allocator-api2 v0.2.16
  Downloaded array-init-cursor v0.2.0
  Downloaded atoi_simd v0.15.6
  Downloaded autocfg v1.1.0
  Downloaded argminmax v0.6.2
  Downloaded base64 v0.22.1
  Downloaded aho-corasick v1.1.2
  Downloaded cc v1.1.31
  Downloaded bitflags v1.3.2
  Downloaded bytemuck_derive v1.5.0
  Downloaded byteorder v1.5.0
  Downloaded regex-automata v0.4.5
  Downloaded shlex v1.3.0
  Downloaded streaming-decompression v0.1.2
  Downloaded equivalent v1.0.1
  Downloaded unindent v0.2.3
  Downloaded windows-targets v0.48.5
  Downloaded wasm-bindgen-shared v0.2.91
  Downloaded windows-targets v0.52.6
  Downloaded scopeguard v1.2.0
  Downloaded home v0.5.9
  Downloaded glob v0.3.1
  Downloaded fallible-streaming-iterator v0.1.9
  Downloaded heck v0.5.0
  Downloaded crossbeam-deque v0.8.5
  Downloaded cfg-if v1.0.0
  Downloaded strength_reduce v0.2.4
  Downloaded iter-read v0.3.1
  Downloaded indoc v2.0.4
  Downloaded dyn-clone v1.0.16
  Downloaded castaway v0.2.3
  Downloaded rustversion v1.0.14
  Downloaded itoa v1.0.10
  Downloaded num-integer v0.1.46
  Downloaded target-features v0.1.5
  Downloaded static_assertions v1.1.0
  Downloaded thiserror v1.0.57
  Downloaded version_check v0.9.4
  Downloaded bumpalo v3.15.1
  Downloaded either v1.13.0
  Downloaded thiserror-impl v2.0.0
  Downloaded wasm-bindgen-macro v0.2.91
  Downloaded wasm-bindgen-macro-support v0.2.91
  Downloaded option-pricing v0.1.4
  Downloaded streaming-iterator v0.1.9
  Downloaded stacker v0.1.15
  Downloaded polars-error v0.43.1
  Downloaded thiserror-impl v1.0.57
  Downloaded polars-schema v0.43.1
  Downloaded recursive v0.1.1
  Downloaded polars-ffi v0.43.1
  Downloaded xxhash-rust v0.8.10
  Downloaded pyo3-polars-derive v0.11.0
  Downloaded recursive-proc-macro-impl v0.1.1
  Downloaded memoffset v0.9.0
  Downloaded simdutf8 v0.1.4
  Downloaded thiserror v2.0.0
  Downloaded getrandom v0.2.12
  Downloaded lock_api v0.4.11
  Downloaded multiversion-macros v0.7.3
  Downloaded log v0.4.20
  Downloaded wasi v0.11.0+wasi-snapshot-preview1
  Downloaded multiversion v0.7.3
  Downloaded bitflags v2.4.2
  Downloaded memmap2 v0.7.1
  Downloaded bytes v1.8.0
  Downloaded wasm-bindgen-backend v0.2.91
  Downloaded smallvec v1.13.1
  Downloaded pyo3-polars v0.17.0
  Downloaded polars-row v0.43.1
  Downloaded psm v0.1.23
  Downloaded zerocopy-derive v0.7.32
  Downloaded unicode-ident v1.0.12
  Downloaded strum_macros v0.26.4
  Downloaded ryu v1.0.17
  Downloaded target-lexicon v0.12.16
  Downloaded serde_derive v1.0.214
  Downloaded serde v1.0.214
  Downloaded rand_chacha v0.3.1
  Downloaded pyo3-macros v0.22.5
  Downloaded bytemuck v1.14.3
  Downloaded once_cell v1.19.0
  Downloaded crossbeam-utils v0.8.20
  Downloaded fast-float v0.2.0
  Downloaded crossbeam-epoch v0.9.18
  Downloaded percent-encoding v2.3.1
  Downloaded planus v0.3.1
  Downloaded polars-compute v0.43.1
  Downloaded polars-mem-engine v0.43.1
  Downloaded polars-utils v0.43.1
  Downloaded ppv-lite86 v0.2.17
  Downloaded rand_core v0.6.4
  Downloaded pyo3-build-config v0.22.5
  Downloaded zerocopy v0.7.32
  Downloaded wasm-bindgen v0.2.91
  Downloaded compact_str v0.8.0
  Downloaded redox_syscall v0.4.1
  Downloaded ethnum v1.5.0
  Downloaded num-traits v0.2.18
  Downloaded parking_lot_core v0.9.9
  Downloaded parking_lot v0.12.1
  Downloaded polars-arrow-format v0.1.0
  Downloaded polars-expr v0.43.1
  Downloaded quote v1.0.35
  Downloaded parquet-format-safe v0.2.4
  Downloaded polars-lazy v0.43.1
  Downloaded proc-macro2 v1.0.89
  Downloaded python3-dll-a v0.2.9
  Downloaded rand_distr v0.4.3
  Downloaded rayon-core v1.12.1
  Downloaded indexmap v2.2.3
  Downloaded pyo3-macros-backend v0.22.5
  Downloaded js-sys v0.3.68
  Downloaded memchr v2.7.1
  Downloaded pyo3-ffi v0.22.5
  Downloaded rand v0.8.5
  Downloaded num-bigint v0.4.4
  Downloaded raw-cpuid v11.0.1
  Downloaded polars v0.43.1
  Downloaded libm v0.2.8
  Downloaded itertools v0.13.0
  Downloaded hashbrown v0.14.5
  Downloaded syn v1.0.109
  Downloaded syn v2.0.87
  Downloaded polars-io v0.43.1
  Downloaded serde-pickle v1.1.1
  Downloaded polars-ops v0.43.1
  Downloaded portable-atomic v1.9.0
  Downloaded rayon v1.9.0
  Downloaded polars-parquet v0.43.1
  Downloaded regex-syntax v0.8.5
  Downloaded chrono v0.4.34
  Downloaded regex v1.10.3
  Downloaded polars-plan v0.43.1
  Downloaded polars-core v0.43.1
  Downloaded polars-arrow v0.43.1
  Downloaded windows_aarch64_gnullvm v0.52.6
  Downloaded windows_aarch64_gnullvm v0.48.5
  Downloaded windows_x86_64_gnullvm v0.52.6
  Downloaded windows_x86_64_gnullvm v0.48.5
  Downloaded pyo3 v0.22.5
  Downloaded libc v0.2.153
  Downloaded windows_i686_gnullvm v0.52.6
  Downloaded windows_aarch64_msvc v0.48.5
  Downloaded windows_aarch64_msvc v0.52.6
  Downloaded windows_x86_64_msvc v0.52.6
  Downloaded windows_x86_64_msvc v0.48.5
  Downloaded windows_x86_64_gnu v0.48.5
  Downloaded windows_i686_gnu v0.52.6
  Downloaded windows_x86_64_gnu v0.52.6
  Downloaded windows_i686_msvc v0.48.5
  Downloaded windows_i686_gnu v0.48.5
  Downloaded windows_i686_msvc v0.52.6
  Downloaded winapi v0.3.9
  Downloaded windows-sys v0.52.0
  Downloaded winapi-i686-pc-windows-gnu v0.4.0
  Downloaded winapi-x86_64-pc-windows-gnu v0.4.0
🍹 Building a mixed python/rust project
🔗 Found pyo3 bindings with abi3 support for Python ≥ 3.8
🐍 Not using a specific python interpreter (Automatically generating windows import library)
   Compiling cfg-if v1.0.0
   Compiling libm v0.2.8
   Compiling serde v1.0.214
   Compiling num-traits v0.2.18
   Compiling crossbeam-utils v0.8.20
   Compiling libc v0.2.153
   Compiling rayon-core v1.12.1
   Compiling either v1.13.0
   Compiling once_cell v1.19.0
   Compiling memchr v2.7.1
   Compiling winapi v0.3.9
   Compiling psm v0.1.23
   Compiling ahash v0.8.9
   Compiling windows_x86_64_msvc v0.48.5
The following warnings were emitted during compilation:

warning: [email protected]: Compiler family detection failed due to error: ToolNotFound: Failed to find tool. Is `clang-cl` installed?
warning: [email protected]: Compiler family detection failed due to error: ToolNotFound: Failed to find tool. Is `clang-cl` installed?

error: failed to run custom build command for `psm v0.1.23`

Caused by:
  process didn't exit successfully: `/io/target/release/build/psm-627b4451f7640b8d/build-script-build` (exit status: 1)
  --- stdout
  OPT_LEVEL = Some(3)
  TARGET = Some(x86_64-pc-windows-msvc)
  OUT_DIR = Some(/io/target/x86_64-pc-windows-msvc/release/build/psm-fabedde2f730ef42/out)
  cargo:rerun-if-env-changed=VCINSTALLDIR
  VCINSTALLDIR = None
  HOST = Some(x86_64-unknown-linux-gnu)
  cargo:rerun-if-env-changed=CC_x86_64-pc-windows-msvc
  CC_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CC_x86_64_pc_windows_msvc
  CC_x86_64_pc_windows_msvc = Some(clang-cl)
  cargo:rerun-if-env-changed=CC_KNOWN_WRAPPER_CUSTOM
  CC_KNOWN_WRAPPER_CUSTOM = None
  RUSTC_WRAPPER = None
  cargo:rerun-if-env-changed=CC_ENABLE_DEBUG_OUTPUT
  cargo:warning=Compiler family detection failed due to error: ToolNotFound: Failed to find tool. Is `clang-cl` installed?
  cargo:rerun-if-env-changed=CRATE_CC_NO_DEFAULTS
  CRATE_CC_NO_DEFAULTS = None
  CARGO_CFG_TARGET_FEATURE = Some(cmpxchg16b,fxsr,sse,sse2,sse3)
  DEBUG = Some(false)
  cargo:rerun-if-env-changed=CFLAGS_x86_64-pc-windows-msvc
  CFLAGS_x86_64-pc-windows-msvc = None
  cargo:rerun-if-env-changed=CFLAGS_x86_64_pc_windows_msvc
  CFLAGS_x86_64_pc_windows_msvc = Some(--target=x86_64-pc-windows-msvc -Wno-unused-command-line-argument -fuse-ld=lld-link /imsvc/root/.cache/cargo-xwin/xwin/crt/include /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/ucrt /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/um /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/shared  )
  cargo:rerun-if-env-changed=CC_SHELL_ESCAPED_FLAGS
  CC_SHELL_ESCAPED_FLAGS = None
  cargo:rustc-check-cfg=cfg(switchable_stack,asm,link_asm)
  cargo:rustc-cfg=asm
  cargo:rustc-cfg=link_asm
  cargo:warning=Compiler family detection failed due to error: ToolNotFound: Failed to find tool. Is `clang-cl` installed?

  --- stderr


  error occurred: Failed to find tool. Is `clang-cl` installed?


warning: build failed, waiting for other jobs to finish...
💥 maturin failed
  Caused by: Failed to build a native library through cargo
  Caused by: Cargo build finished with "exit status: 101": `env -u CARGO AR_x86_64_pc_windows_msvc="llvm-lib" BINDGEN_EXTRA_CLANG_ARGS_x86_64_pc_windows_msvc="-I/root/.cache/cargo-xwin/xwin/crt/include -I/root/.cache/cargo-xwin/xwin/sdk/include/ucrt -I/root/.cache/cargo-xwin/xwin/sdk/include/um -I/root/.cache/cargo-xwin/xwin/sdk/include/shared" CARGO_ENCODED_RUSTFLAGS="-C\u{1f}linker-flavor=lld-link\u{1f}-Lnative=/root/.cache/cargo-xwin/xwin/crt/lib/x86_64\u{1f}-Lnative=/root/.cache/cargo-xwin/xwin/sdk/lib/um/x86_64\u{1f}-Lnative=/root/.cache/cargo-xwin/xwin/sdk/lib/ucrt/x86_64" CARGO_TARGET_X86_64_PC_WINDOWS_MSVC_LINKER="lld-link" CC_x86_64_pc_windows_msvc="clang-cl" CFLAGS_x86_64_pc_windows_msvc="--target=x86_64-pc-windows-msvc -Wno-unused-command-line-argument -fuse-ld=lld-link /imsvc/root/.cache/cargo-xwin/xwin/crt/include /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/ucrt /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/um /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/shared  " CL_FLAGS="--target=x86_64-pc-windows-msvc -Wno-unused-command-line-argument -fuse-ld=lld-link /imsvc/root/.cache/cargo-xwin/xwin/crt/include /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/ucrt /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/um /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/shared " CMAKE_GENERATOR="Ninja" CMAKE_SYSTEM_NAME="Windows" CMAKE_TOOLCHAIN_FILE_x86_64_pc_windows_msvc="/root/.cache/cargo-xwin/cmake/x86_64-pc-windows-msvc-toolchain.cmake" CXXFLAGS_x86_64_pc_windows_msvc="--target=x86_64-pc-windows-msvc -Wno-unused-command-line-argument -fuse-ld=lld-link /imsvc/root/.cache/cargo-xwin/xwin/crt/include /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/ucrt /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/um /imsvc/root/.cache/cargo-xwin/xwin/sdk/include/shared  " CXX_x86_64_pc_windows_msvc="clang-cl" PATH="/root/.cargo/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/root/.cache/cargo-xwin" RCFLAGS="-I/root/.cache/cargo-xwin/xwin/crt/include -I/root/.cache/cargo-xwin/xwin/sdk/include/ucrt -I/root/.cache/cargo-xwin/xwin/sdk/include/um -I/root/.cache/cargo-xwin/xwin/sdk/include/shared" TARGET_AR="llvm-lib" TARGET_CC="clang-cl" TARGET_CXX="clang-cl" "cargo" "rustc" "--target" "x86_64-pc-windows-msvc" "--message-format" "json-render-diagnostics" "--manifest-path" "/io/Cargo.toml" "--release" "--lib"`
/io/maturin-build-win-msvc.sh: line 4: docker-msvc: command not found

I'm puzzled as I read in the cargo-xwin prerequisite that for a Rust only project (my case) no clang or llvm is necessary.
What am I missing ?

BTW: Unsurprising the corp proxy issue has gone (Cf comment above). So I need find a way to solve these 2 separate issues.