Description
🐛 Bug Reports
When cross-compiling pyo3s build.rs fails on two places without any pointers on what lines, but rather just "Error: NotPresent",
The guilty lines in build.rs:
https://github.com/PyO3/pyo3/blob/master/build.rs#L157, env::var("CARGO_CFG_TARGET_FAMILY") is not set
https://github.com/PyO3/pyo3/blob/master/build.rs#L433, env::var("CARGO_CFG_TARGET_FAMILY") is not set
After that, a custom python 32bit compilation requires PYO3_CROSS_INCLUDE_DIR which is only set for windows in fn cross_compilings https://github.com/PyO3/pyo3/blob/master/build.rs#L150
And finally, Include/pyconfig.h doesn't exists in https://www.python.org/downloads/release/python-379/
Which is required at https://github.com/PyO3/pyo3/blob/master/build.rs#L414
pyconfig.h gets generated when using ./configure and ends up in the root dir.
Also, when python is configured without --enable-shared and such, options retrieved from config_map crashes instead of defaulting to false, dunno if there's a reason for that. https://github.com/PyO3/pyo3/blob/master/build.rs#L415 but unwrap_or(false) might be better than current solution?
Accidently posted this issue before successfully compiling, will update on progress
update:
Well, seem to have gotten rid of all errors in build.rs, it seems to find all neccessary files and and so on but now I get about 100 errors regarding libc.
Using wasm32-wasi instead pulls the errors down to only 3 regarding wchar_t in libc. Seems to be a problem with libc and wasm32 target from here on out.
cargo build --release --target wasm32-wasi
pyo3 git:(master) ✗ cargo build --release --target wasm32-wasi
...
Compiling libc v0.2.79
Compiling pyo3 v0.12.1 (/home/cfr/workspace/clones/pyo3)
...
error[E0432]: unresolved import `libc::wchar_t`
--> src/ffi/unicodeobject.rs:3:5
|
3 | use libc::wchar_t;
| ^^^^^^^^^^^^^ no `wchar_t` in the root
error[E0432]: unresolved import `libc::wchar_t`
--> src/ffi/pylifecycle.rs:2:5
|
2 | use libc::wchar_t;
| ^^^^^^^^^^^^^ no `wchar_t` in the root
error[E0432]: unresolved import `libc::wchar_t`
--> src/ffi/sysmodule.rs:3:5
|
3 | use libc::wchar_t;
| ^^^^^^^^^^^^^ no `wchar_t` in the root
error: aborting due to 3 previous errors
🌍 Environment
- Your operating system and version: Linux debian 4.19.0-11-amd64 Ideas and progress #1 SMP Debian 4.19.146-1 (2020-09-17) x86_64 GNU/Linu
- Your python version: 3.7.9 (default, Oct 10 2020, 16:39:07) [GCC 8.3.0] ('32bit', 'ELF')
- How did you install python (e.g. apt or pyenv)? Did you use a virtualenv?: Compiled from source
- Your Rust version (
rustc --version): rustc 1.49.0-nightly (38d911dfc 2020-10-09) - Your PyO3 version: Cloned from git master today
- Have you tried using latest PyO3 master (replace
version = "0.x.y"withgit = "https://github.com/PyO3/pyo3")?: yupp
💥 Reproducing
Please provide a minimal working example. This means both the Rust code and the Python.
Please also write what exact flags are required to reproduce your results.
Compiled Python 3.7.9 with
CFLAGS=-m32 LDFLAGS=-m32 ./configure --enable-shared
make
Setup PYO3_CROSS flags
export PYO3_CROSS_PYTHON_VERSION=3.7
export PYO3_PYTHON=/home/Python-3.7.9/python
export PYO3_CROSS_INCLUDE_DIR=/home/Python-3.7.9/Include
export PYO3_CROSS_LIB_DIR=/home/Python-3.7.9/build/lib.linux-x86_64-3.7
lib.rs
use wasm_bindgen::prelude::*;
use pyo3::prelude::*;
use pyo3::types::IntoPyDict;
// Called when the wasm module is instantiated
#[wasm_bindgen(start)]
pub fn main() -> Result<(), JsValue> {
// Use `web_sys`'s global `window` function to get a handle on the global
// window object.
let window = web_sys::window().expect("no global `window` exists");
let document = window.document().expect("should have a document on window");
let body = document.body().expect("document should have a body");
// Manufacture the element we're gonna append
let val = document.create_element("p")?;
Python::with_gil(|py| {
main_(py).map_err(|e| {
// We can't display Python exceptions via std::fmt::Display,
// so print the error here manually.
e.print_and_set_sys_last_vars(py);
val.set_inner_html("Hello from Python!");
})
});
body.append_child(&val)?;
Ok(())
}
#[wasm_bindgen]
pub fn add(a: u32, b: u32) -> u32 {
a + b
}
fn main_(py: Python) -> PyResult<()> {
let sys = py.import("sys")?;
let version: String = sys.get("version")?.extract()?;
let locals = [("os", py.import("os")?)].into_py_dict(py);
let code = "os.getenv('USER') or os.getenv('USERNAME') or 'Unknown'";
let user: String = py.eval(code, None, Some(&locals))?.extract()?;
println!("Hello {}, I'm Python {}", user, version);
Ok(())
}Cargo.toml
[lib]
crate-type = ["cdylib"]
[dependencies]
wasm-bindgen = "*"
pyo3 = {path="/home/cfr/workspace/clones/pyo3"}
[dependencies.web-sys]
version = "0.3.4"
features = [
'Document',
'Element',
'HtmlElement',
'Node',
'Window',
]
Build command
wasm-pack build --target web