Add support for cross compiling PyPy wheels when abi3 feature is enabled

.github/workflows/test.yml

@@ -286,5 +286,9 @@ jobs:
           # Use PYO3_CROSS_LIB_DIR
           export PYO3_CROSS_LIB_DIR=/opt/python/${{ matrix.platform.abi }}
           cargo run --target x86_64-unknown-linux-gnu -- build -i python3.9 --release --out dist --target ${{ matrix.platform.target }} -m test-crates/pyo3-mixed/Cargo.toml
+          unset PYO3_CROSS_LIB_DIR
+
+          # Test abi3
+          cargo run --target x86_64-unknown-linux-gnu -- build -i ${{ matrix.platform.python }} --release --out dist --target ${{ matrix.platform.target }} -m test-crates/pyo3-pure/Cargo.toml
           ' > build-wheel.sh
           docker run --rm -v "$PWD":/io -w /io messense/manylinux2014-cross:${{ matrix.platform.arch }} bash build-wheel.sh

Changelog.md

@@ -17,6 +17,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Add support for using bundled python sysconfigs for PyPy when abi3 feature is enabled in [#958](https://github.com/PyO3/maturin/pull/958)
 * Set `PYO3_PYTHON` env var for PyPy when abi3 is enabled in [#960](https://github.com/PyO3/maturin/pull/960)
 * Add sysconfigs for x64 Windows PyPy in [#962](https://github.com/PyO3/maturin/pull/962)
+* Add support for cross compiling PyPy wheels when abi3 feature is enabled in [#963](https://github.com/PyO3/maturin/pull/963)
 
 ## [0.12.19] - 2022-06-05
 

src/build_options.rs

@@ -987,6 +987,25 @@ pub fn find_interpreter(
                         platform: None,
                         runnable: false,
                     }])
+                } else if target.cross_compiling() {
+                    let mut interps = Vec::with_capacity(interpreters.len());
+                    let mut pypys = Vec::new();
+                    for interp in interpreters {
+                        if matches!(interp.interpreter_kind, InterpreterKind::PyPy) {
+                            pypys.push(PathBuf::from(format!(
+                                "pypy{}.{}",
+                                interp.major, interp.minor
+                            )));
+                        } else {
+                            interps.push(interp);
+                        }
+                    }
+                    // cross compiling to PyPy with abi3 feature enabled,
+                    // we cannot use host pypy so switch to bundled sysconfig instead
+                    if !pypys.is_empty() {
+                        interps.extend(find_interpreter_in_sysconfig(&pypys, target)?)
+                    }
+                    Ok(interps)
                 } else {
                     Ok(interpreters)
                 }