feat: Windows filtering and sets

Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>

cibuildwheel/util.py

@@ -2,13 +2,14 @@ import os
 import platform as platform_module
 import re
 import ssl
+import functools
 import textwrap
 import urllib.request
 from enum import Enum
 from fnmatch import fnmatch
 from pathlib import Path
 from time import sleep
-from typing import Dict, List, NamedTuple, Optional
+from typing import Dict, List, NamedTuple, Optional, Set
 
 import certifi
 
@@ -124,7 +125,10 @@ class DependencyConstraints:
         return f'{self.__class__.__name__}{self.base_file_path!r})'
 
 
+@functools.total_ordering
 class Architecture(Enum):
+    value: str
+
     # mac/linux archs
     x86_64 = 'x86_64'
     i686 = 'i686'
@@ -136,25 +140,29 @@ class Architecture(Enum):
     x86 = 'x86'
     AMD64 = 'AMD64'
 
+    # Allow this to be sorted
+    def __lt__(self, other: "Architecture") -> bool:
+        return self.value < other.value
+
     @staticmethod
-    def parse_config(config: str, platform: str) -> 'List[Architecture]':
-        result = []
+    def parse_config(config: str, platform: str) -> 'Set[Architecture]':
+        result = set()
         for arch_str in re.split(r'[\s,]+', config):
             if arch_str == 'auto':
-                result += Architecture.auto_archs(platform=platform)
+                result |= Architecture.auto_archs(platform=platform)
             else:
-                result.append(Architecture(arch_str))
+                result.add(Architecture(arch_str))
         return result
 
     @staticmethod
-    def auto_archs(platform: str) -> 'List[Architecture]':
+    def auto_archs(platform: str) -> 'Set[Architecture]':
         native_architecture = Architecture(platform_module.machine())
-        result = [native_architecture]
+        result = {native_architecture}
         if platform == 'linux' and native_architecture == Architecture.x86_64:
             # x86_64 machines can run i686 docker containers
-            result.append(Architecture.i686)
+            result.add(Architecture.i686)
         if platform == 'windows' and native_architecture == Architecture.AMD64:
-            result.append(Architecture.x86)
+            result.add(Architecture.x86)
         return result
 
 
@@ -162,7 +170,7 @@ class BuildOptions(NamedTuple):
     package_dir: Path
     output_dir: Path
     build_selector: BuildSelector
-    architectures: List[Architecture]
+    architectures: Set[Architecture]
     environment: ParsedEnvironment
     before_all: str
     before_build: Optional[str]