Fix compilation bug in toolchain >= 1.70.0

Fix #320

Author: yasuo-ozu

setuptools_rust/build.py

@@ -28,7 +28,15 @@
 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 _detect_toolchain_1_70_or_later() -> bool:
+    version = get_rust_version()
+    return version.major > 1 or (
+        version.major == 1 and version.minor >= 70
+    )
 
 
 class build_rust(RustCommand):
@@ -142,6 +150,7 @@ def build_extension(
 
         quiet = self.qbuild or ext.quiet
         debug = self._is_debug_build(ext)
+        is_toolchain_1_70_or_later = _detect_toolchain_1_70_or_later()
 
         cargo_args = self._cargo_args(
             ext=ext, target_triple=target_triple, release=not debug, quiet=quiet
@@ -160,11 +169,18 @@ def build_extension(
             ]
 
         else:
-            rustc_args = [
-                "--crate-type",
-                "cdylib",
-                *ext.rustc_flags,
-            ]
+            # If toolchain >= 1.70.0, use '--crate-type' option of cargo.
+            # See https://github.com/PyO3/setuptools-rust/issues/320
+            if is_toolchain_1_70_or_later:
+                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 +205,9 @@ def build_extension(
             ):
                 rustc_args.extend(["-C", f"link-args=-sSIDE_MODULE=2 -sWASM_BIGINT"])
 
+            if is_toolchain_1_70_or_later:
+                cargo_args.extend(["--crate-type", "cdylib"])
+
             command = [
                 self.cargo,
                 "rustc",