Add support linking with pyo3 in abi3 debug mode on Windows

src/build_context.rs

@@ -533,7 +533,8 @@ impl BuildContext {
             &self.project_layout,
             &self.module_name,
             &artifact.path,
-            None,
+            self.interpreter.first(),
+            true,
             &self.target,
             self.editable,
             self.pyproject_toml.as_ref(),
@@ -612,6 +613,7 @@ impl BuildContext {
             &self.module_name,
             &artifact.path,
             Some(python_interpreter),
+            false,
             &self.target,
             self.editable,
             self.pyproject_toml.as_ref(),

src/build_options.rs

@@ -371,6 +371,11 @@ impl BuildOptions {
                             implmentation_name: "cpython".to_string(),
                             soabi: None,
                         }])
+                    } else if let Some(config_file) = env::var_os("PYO3_CONFIG_FILE") {
+                        let interpreter_config =
+                            InterpreterConfig::from_pyo3_config(config_file.as_ref(), target)
+                                .context("Invalid PYO3_CONFIG_FILE")?;
+                        Ok(vec![PythonInterpreter::from_config(interpreter_config)])
                     } else if let Some(interp) = interpreters.get(0) {
                         println!("🐍 Using {interp} to generate to link bindings (With abi3, an interpreter is only required on windows)");
                         Ok(interpreters)

src/module_writer.rs

@@ -712,22 +712,27 @@ pub fn write_bindings_module(
     module_name: &str,
     artifact: &Path,
     python_interpreter: Option<&PythonInterpreter>,
+    is_abi3: bool,
     target: &Target,
     editable: bool,
     pyproject_toml: Option<&PyProjectToml>,
 ) -> Result<()> {
     let ext_name = &project_layout.extension_name;
-    let so_filename = match python_interpreter {
-        Some(python_interpreter) => python_interpreter.get_library_name(ext_name),
-        // abi3
-        None => {
-            if target.is_unix() {
-                format!("{ext_name}.abi3.so")
-            } else {
+    let so_filename = if is_abi3 {
+        if target.is_unix() {
+            format!("{ext_name}.abi3.so")
+        } else {
+            match python_interpreter {
+                Some(python_interpreter) if python_interpreter.is_windows_debug() => {
+                    format!("{ext_name}_d.pyd")
+                }
                 // Apparently there is no tag for abi3 on windows
-                format!("{ext_name}.pyd")
+                _ => format!("{ext_name}.pyd"),
             }
         }
+    } else {
+        let python_interpreter = python_interpreter.context("")?;
+        python_interpreter.get_library_name(ext_name)
     };
 
     if !editable {

src/python_interpreter/mod.rs

@@ -539,6 +539,11 @@ impl PythonInterpreter {
         )
     }
 
+    /// Is this a debug build of Python for Windows?
+    pub fn is_windows_debug(&self) -> bool {
+        self.ext_suffix.starts_with("_d.") && self.ext_suffix.ends_with(".pyd")
+    }
+
     /// Checks whether the given command is a python interpreter and returns a
     /// [PythonInterpreter] if that is the case
     pub fn check_executable(

test-crates/pyo3-ffi-pure/Cargo.toml

@@ -4,7 +4,7 @@ version = "1.0.0"
 edition = "2021"
 
 [dependencies]
-pyo3-ffi = { version = "0.17.3", features = ["abi3-py37", "extension-module"] }
+pyo3-ffi = { version = "0.18.1", features = ["abi3-py37", "extension-module"] }
 
 [lib]
 name = "pyo3_ffi_pure"