Add support for using bundled python sysconfigs for PyPy when abi3 feature is enabled

Changelog.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Don't require `pip` error messages to be utf-8 encoding in [#953](https://github.com/PyO3/maturin/pull/953)
 * Compare minimum python version requirement between `requires-python` and bindings crate in [#954](https://github.com/PyO3/maturin/pull/954)
 * Add a `--target` option to `maturin list-python` command in [#957](https://github.com/PyO3/maturin/pull/957)
+* Add support for using bundled python sysconfigs for PyPy when abi3 feature is enabled in [#958](https://github.com/PyO3/maturin/pull/958)
 
 ## [0.12.19] - 2022-06-05
 

src/build_options.rs

@@ -908,11 +908,19 @@ pub fn find_interpreter(
         }
         BridgeModel::Bin(None) => Ok(vec![]),
         BridgeModel::BindingsAbi3(major, minor) => {
-            let interpreter = if !interpreter.is_empty() {
-                PythonInterpreter::check_executables(interpreter, target, bridge)
-                    .unwrap_or_default()
+            let interpreters = if !interpreter.is_empty() {
+                match find_interpreter_in_host(bridge, interpreter, target, Some(*minor as usize)) {
+                    Ok(host_interps) => host_interps,
+                    Err(err) => {
+                        if !interpreter.is_empty() {
+                            find_interpreter_in_sysconfig(interpreter, target).map_err(|_| err)?
+                        } else {
+                            Vec::new()
+                        }
+                    }
+                }
             } else {
-                PythonInterpreter::find_all(target, bridge, Some(*minor as usize))
+                find_interpreter_in_host(bridge, interpreter, target, Some(*minor as usize))
                     .unwrap_or_default()
             };
             // Ideally, we wouldn't want to use any python interpreter without abi3 at all.
@@ -937,9 +945,9 @@ pub fn find_interpreter(
                         platform: None,
                         runnable: false,
                     }])
-                } else if let Some(interp) = interpreter.get(0) {
+                } else if let Some(interp) = interpreters.get(0) {
                     println!("🐍 Using {} to generate to link bindings (With abi3, an interpreter is only required on windows)", interp);
-                    Ok(interpreter)
+                    Ok(interpreters)
                 } else if generate_import_lib {
                     println!("🐍 Not using a specific python interpreter (Automatically generating windows import library)");
                     // fake a python interpreter
@@ -980,7 +988,7 @@ pub fn find_interpreter(
                         runnable: false,
                     }])
                 } else {
-                    Ok(interpreter)
+                    Ok(interpreters)
                 }
             }
         }

src/compile.rs

@@ -308,7 +308,10 @@ fn compile_target(
 
             // rust-cpython, and legacy pyo3 versions
             build_command.env("PYTHON_SYS_EXECUTABLE", &interpreter.executable);
-        } else if (bindings_crate.is_bindings("pyo3") || bindings_crate.is_bindings("pyo3-ffi"))
+        } else if (bindings_crate.is_bindings("pyo3")
+            || bindings_crate.is_bindings("pyo3-ffi")
+            || (matches!(bindings_crate, BridgeModel::BindingsAbi3(_, _))
+                && matches!(interpreter.interpreter_kind, InterpreterKind::PyPy)))
             && env::var_os("PYO3_CONFIG_FILE").is_none()
         {
             let pyo3_config = interpreter.pyo3_config_file();