Make macOS deployment target check robust against float precision err…

…ors. (#52)

.github/workflows/build_wheels.yml

@@ -86,7 +86,6 @@ jobs:
         uses: pypa/[email protected]
         env:
           CIBW_ARCHS_LINUX: auto aarch64
-          MACOSX_DEPLOYMENT_TARGET: 10.15
 
       - uses: actions/upload-artifact@v3
         with:

setup.py

@@ -2,7 +2,7 @@
 import platform
 import sys
 from setuptools import setup, Extension
-from typing import List, Optional
+from typing import List, Optional, Tuple
 
 ir_native: Extension = Extension(
     name="clp_ffi_py.ir.native",
@@ -44,15 +44,22 @@
 if "__main__" == __name__:
     try:
         if "Darwin" == platform.system():
-            target: Optional[str] = os.environ.get("MACOSX_DEPLOYMENT_TARGET")
-            if None is target or float(target) < 10.15:
-                os.environ["MACOSX_DEPLOYMENT_TARGET"] = "10.15"
+            target_env_var_name: str = "MACOSX_DEPLOYMENT_TARGET"
+            min_target_version: Tuple[int, int] = (10, 15)
+
+            target_str: Optional[str] = os.environ.get(target_env_var_name)
+            target: Tuple[int, ...] = ()
+            if target_str is not None:
+                target = tuple(int(part) for part in target_str.split("."))
+            if target < min_target_version:
+                target = min_target_version
+            os.environ[target_env_var_name] = ".".join(str(part) for part in target)
 
         project_name: str = "clp_ffi_py"
         description: str = "CLP FFI Python Interface"
         extension_modules: List[Extension] = [ir_native]
         if (3, 7) > sys.version_info:
-            sys.exit(f"The minimum Python version required is Python3.7")
+            sys.exit("The minimum Python version required is Python3.7")
         else:
             setup(
                 name=project_name,