try both python and python.exe binary names

Author: Gentle

build.rs

@@ -17,11 +17,6 @@ use {
 
 const ZSTD_COMPRESSION_LEVEL: i32 = 19;
 
-#[cfg(any(target_os = "macos", target_os = "windows"))]
-const PYTHON_EXECUTABLE: &str = "python.exe";
-#[cfg(not(any(target_os = "macos", target_os = "windows")))]
-const PYTHON_EXECUTABLE: &str = "python";
-
 #[cfg(target_os = "windows")]
 const CLANG_EXECUTABLE: &str = "clang.exe";
 #[cfg(not(target_os = "windows"))]
@@ -265,24 +260,36 @@ fn add(builder: &mut Builder<impl Write>, root: &Path, path: &Path) -> Result<()
     Ok(())
 }
 
+fn find_python_binary(cpython_dir: &Path) -> Option<&'static str> {
+    for name in ["python", "python.exe"] {
+        if cpython_dir.join(name).is_file() {
+            return Some(name);
+        }
+    }
+    None
+}
+
 fn maybe_make_cpython(repo_dir: &Path, wasi_sdk: &Path) -> Result<()> {
     let cpython_wasi_dir = repo_dir.join("cpython/builddir/wasi");
     if !cpython_wasi_dir.join("libpython3.14.so").exists() {
         if !cpython_wasi_dir.join("libpython3.14.a").exists() {
             let cpython_native_dir = repo_dir.join("cpython/builddir/build");
-            if !cpython_native_dir.join(PYTHON_EXECUTABLE).exists() {
+            if let None = find_python_binary(&cpython_native_dir) {
                 fs::create_dir_all(&cpython_native_dir)?;
                 fs::create_dir_all(&cpython_wasi_dir)?;
 
                 run(Command::new("../../configure")
                     .current_dir(&cpython_native_dir)
                     .arg(format!(
                         "--prefix={}/install",
-                        cpython_native_dir.to_str().unwrap()
+                        &cpython_native_dir.to_str().unwrap()
                     )))?;
 
-                run(Command::new("make").current_dir(cpython_native_dir))?;
+                run(Command::new("make").current_dir(&cpython_native_dir))?;
             }
+            let Some(python_executable) = find_python_binary(&cpython_native_dir) else {
+                bail!("python binary not found");
+            };
 
             let config_guess =
                 run(Command::new("../../config.guess").current_dir(&cpython_wasi_dir))?;
@@ -300,7 +307,7 @@ fn maybe_make_cpython(repo_dir: &Path, wasi_sdk: &Path) -> Result<()> {
                     "--host=wasm32-unknown-wasip2",
                     &format!("--build={}", String::from_utf8(config_guess)?),
                     &format!(
-                        "--with-build-python={}/../build/{PYTHON_EXECUTABLE}",
+                        "--with-build-python={}/../build/{python_executable}",
                         cpython_wasi_dir.to_str().unwrap()
                     ),
                     &format!("--prefix={}/install", cpython_wasi_dir.to_str().unwrap()),