Modified build_scripts/build_helios.py to respect the CMAKE_OSX_ARCHITECTURES

  environment variable when present, before falling back to Python interpreter detection.

Author: bnbailey-psl

build_scripts/build_helios.py

@@ -348,7 +348,19 @@ def _configure_for_architecture(self):
             self.config['cmake_args'] = ['-A', arch_flag]
 
         elif self.platform_name == 'Darwin':  # macOS
-            if self.architecture == 'arm64':
+            # Check if CMAKE_OSX_ARCHITECTURES is already set in environment (e.g., by cibuildwheel)
+            env_cmake_arch = os.environ.get('CMAKE_OSX_ARCHITECTURES')
+            if env_cmake_arch:
+                self.config['cmake_args'].append(f'-DCMAKE_OSX_ARCHITECTURES={env_cmake_arch}')
+                print(f"Using CMAKE_OSX_ARCHITECTURES from environment: {env_cmake_arch}")
+                # Update our internal architecture tracking to match environment
+                if env_cmake_arch == 'arm64':
+                    self.architecture = 'arm64'
+                    print("Configuring for Apple Silicon (ARM64) - from environment")
+                else:
+                    self.architecture = 'x64'  
+                    print("Configuring for Intel Mac (x86_64) - from environment")
+            elif self.architecture == 'arm64':
                 # Apple Silicon - set CMAKE_OSX_ARCHITECTURES
                 self.config['cmake_args'].append('-DCMAKE_OSX_ARCHITECTURES=arm64')
                 print("Configuring for Apple Silicon (ARM64)")