Crate python3_dll_a

Standalone python3.dll import library generator

Generates import libraries for the Stable ABI Python DLL for MinGW-w64 and MSVC (cross-)compile targets.

See https://docs.python.org/3/c-api/stable.html for details.

This crate does not require Python 3 distribution files to be present on the (cross-)compile host system.

Note: MSVC (cross-)compile targets require LLVM binutils to be available on the host system. More specifically, python3-dll-a requires llvm-dlltool executable to be present in PATH when targeting *-pc-windows-msvc.

Example build.rs script

The following script can be used to cross-compile Stable ABI PyO3 extension modules for Windows (64-bit MinGW-w64):

fn main() {
    if std::env::var("TARGET").unwrap() == "x86_64-pc-windows-gnu" {
        let libdir = std::env::var("PYO3_CROSS_LIB_DIR")
            .expect("PYO3_CROSS_LIB_DIR is not set when cross-compiling");
        python3_dll_a::generate_implib(&libdir)
            .expect("python3.dll import library generator failed");
    }
}

A compatible python3.dll import library will be automatically created in the directory pointed by PYO3_CROSS_LIB_DIR environment variable.

If both 64-bit and 32-bit or GNU and MSVC ABI (cross-)compile target support is needed, the more generic generate_implib_for_target() function must be used:

fn main() {
    if std::env::var("CARGO_CFG_TARGET_OS").unwrap() == "windows" {
        let libdir = std::env::var("PYO3_CROSS_LIB_DIR")
            .expect("PYO3_CROSS_LIB_DIR is not set when cross-compiling");
        let arch = std::env::var("CARGO_CFG_TARGET_ARCH").unwrap();
        let env = std::env::var("CARGO_CFG_TARGET_ENV").unwrap();
        python3_dll_a::generate_implib_for_target(&libdir, &arch, &env)
            .expect("python3.dll import library generator failed");
    }
}

Example cargo build invocation

PYO3_CROSS_LIB_DIR=target/python3-dll cargo build --target x86_64-pc-windows-gnu

Functions

generate_implib

Generates python3.dll import library directly from the embedded Python Stable ABI definitions data for the default 64-bit MinGW-w64 compile target.

generate_implib_for_target

Generates python3.dll import library directly from the embedded Python Stable ABI definitions data for the specified compile target.