Use --crate-type cargo option on >= 1.64.0 (#322)

Author: yasuo-ozu

Diff for: CHANGELOG.md

@@ -4,6 +4,7 @@
 ### Fixed
 - Fix a bug where rebuilding the library would cause any running processes using it to segfault. [#295](https://github.com/PyO3/setuptools-rust/pull/295)
 - Fix `setup.cfg` format for compatibility with "poetry==1.4.0". [#319](https://github.com/PyO3/setuptools-rust/pull/319)
+- Fix to use `--crate-type` option of cargo if "toolchain >= 1.64". [#322](https://github.com/PyO3/setuptools-rust/pull/322)
 
 ## 1.5.2 (2022-09-19)
 ### Fixed

Diff for: setuptools_rust/build.py

@@ -28,7 +28,22 @@
 from ._utils import format_called_process_error
 from .command import RustCommand
 from .extension import Binding, RustBin, RustExtension, Strip
-from .rustc_info import get_rust_host, get_rust_target_list, get_rustc_cfgs
+from .rustc_info import (
+    get_rust_host,
+    get_rust_target_list,
+    get_rustc_cfgs,
+    get_rust_version,
+)
+from semantic_version import Version
+
+
+def _check_cargo_supports_crate_type_option() -> bool:
+    version = get_rust_version()
+
+    if version is None:
+        return False
+
+    return version.major > 1 or (version.major == 1 and version.minor >= 64)  # type: ignore
 
 
 class build_rust(RustCommand):
@@ -142,6 +157,7 @@ def build_extension(
 
         quiet = self.qbuild or ext.quiet
         debug = self._is_debug_build(ext)
+        use_cargo_crate_type = _check_cargo_supports_crate_type_option()
 
         cargo_args = self._cargo_args(
             ext=ext, target_triple=target_triple, release=not debug, quiet=quiet
@@ -160,11 +176,18 @@ def build_extension(
             ]
 
         else:
-            rustc_args = [
-                "--crate-type",
-                "cdylib",
-                *ext.rustc_flags,
-            ]
+            # If toolchain >= 1.64.0, use '--crate-type' option of cargo.
+            # See https://github.com/PyO3/setuptools-rust/issues/320
+            if use_cargo_crate_type:
+                rustc_args = [
+                    *ext.rustc_flags,
+                ]
+            else:
+                rustc_args = [
+                    "--crate-type",
+                    "cdylib",
+                    *ext.rustc_flags,
+                ]
 
             # OSX requires special linker arguments
             if rustc_cfgs.get("target_os") == "macos":
@@ -189,6 +212,9 @@ def build_extension(
             ):
                 rustc_args.extend(["-C", f"link-args=-sSIDE_MODULE=2 -sWASM_BIGINT"])
 
+            if use_cargo_crate_type and "--crate-type" not in cargo_args:
+                cargo_args.extend(["--crate-type", "cdylib"])
+
             command = [
                 self.cargo,
                 "rustc",