Add support for cross compiling PyPy wheels

.github/workflows/test.yml

@@ -211,6 +211,7 @@ jobs:
     strategy:
       matrix:
         platform:
+          # CPython
           - target: aarch64-unknown-linux-gnu
             arch: aarch64
             abi: cp36-cp36m
@@ -220,14 +221,21 @@ jobs:
           - target: s390x-unknown-linux-gnu
             arch: s390x
             abi: cp310-cp310
+          # PyPy
+          - target: aarch64-unknown-linux-gnu
+            arch: aarch64
+            abi: pp37-pypy37_pp73
+          - target: aarch64-unknown-linux-gnu
+            arch: aarch64
+            abi: pp38-pypy38_pp73
     steps:
       - uses: actions/checkout@v2
       - name: Build Wheels
         run: |
           echo 'curl -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable --profile minimal
           source ~/.cargo/env
           rustup target add ${{ matrix.platform.target }}
-          export PYO3_CROSS_LIB_DIR=/opt/python/${{ matrix.platform.abi }}/lib
+          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 --no-sdist --target ${{ matrix.platform.target }} -m test-crates/pyo3-mixed/Cargo.toml
           ' > build-wheel.sh
           docker run --rm -v "$PWD":/io -w /io messense/manylinux2014-cross:${{ matrix.platform.arch }} bash build-wheel.sh

src/build_options.rs

@@ -529,6 +529,11 @@ pub fn find_interpreter(
                     env::set_var("PYTHON_SYS_EXECUTABLE", &host_python.executable);
 
                     let sysconfig_path = find_sysconfigdata(cross_lib_dir.as_ref(), target)?;
+                    env::set_var(
+                        "MATURIN_PYTHON_SYSCONFIGDATA_DIR",
+                        sysconfig_path.parent().unwrap(),
+                    );
+
                     let sysconfig_data = parse_sysconfigdata(host_python, sysconfig_path)?;
                     let major = sysconfig_data
                         .get("version_major")

src/compile.rs

@@ -230,6 +230,10 @@ fn compile_target(
         }
     }
 
+    if let Some(lib_dir) = env::var_os("MATURIN_PYTHON_SYSCONFIGDATA_DIR") {
+        build_command.env("PYO3_CROSS_LIB_DIR", lib_dir);
+    }
+
     let mut cargo_build = build_command.spawn().context("Failed to run cargo")?;
 
     let mut artifacts = HashMap::new();

src/cross_compile.rs

@@ -147,12 +147,12 @@ pub fn find_sysconfigdata(lib_dir: &Path, target: &Target) -> Result<PathBuf> {
 /// recursive search for _sysconfigdata, returns all possibilities of sysconfigdata paths
 fn search_lib_dir(path: impl AsRef<Path>, target: &Target) -> Vec<PathBuf> {
     let mut sysconfig_paths = vec![];
-    let version_pat = if let Some(v) =
+    let (cpython_version_pat, pypy_version_pat) = if let Some(v) =
         env::var_os("PYO3_CROSS_PYTHON_VERSION").map(|s| s.into_string().unwrap())
     {
-        format!("python{}", v)
+        (format!("python{}", v), format!("pypy{}", v))
     } else {
-        "python3.".into()
+        ("python3.".into(), "pypy3.".into())
     };
     for f in fs::read_dir(path.as_ref()).expect("Path does not exist") {
         let sysc = match &f {
@@ -173,7 +173,12 @@ fn search_lib_dir(path: impl AsRef<Path>, target: &Target) -> Vec<PathBuf> {
                 }
                 search_lib_dir(f.path(), target)
             }
-            Ok(f) if starts_with(f, &version_pat) => search_lib_dir(f.path(), target),
+            Ok(f) if starts_with(f, &cpython_version_pat) => search_lib_dir(f.path(), target),
+            // PyPy 3.7: /opt/python/pp37-pypy37_pp73/lib_pypy/_sysconfigdata__linux_x86_64-linux-gnu.py
+            Ok(f) if starts_with(f, "lib_pypy") => search_lib_dir(f.path(), target),
+            // PyPy 3.8: /opt/python/pp38-pypy38_pp73/lib/pypy3.8/_sysconfigdata__linux_x86_64-linux-gnu.py
+            Ok(f) if starts_with(f, &pypy_version_pat) => search_lib_dir(f.path(), target),
+            Ok(f) if starts_with(f, "lib") && f.path().is_dir() => search_lib_dir(f.path(), target),
             _ => continue,
         };
         sysconfig_paths.extend(sysc);