Update Windows builds to use ClangCL

zanieb · zanieb · commit 16c9a50164d3 · 2025-03-17T15:37:09.000-05:00
diff --git a/cpython-windows/build.py b/cpython-windows/build.py
@@ -653,6 +653,9 @@ def run_msbuild(
         # This can also work around known incompatibilities with the Windows 11
         # SDK as of at least CPython 3.9.7.
         f"/property:DefaultWindowsSDKVersion={windows_sdk_version}",
+        # Use ClangCL for better build and runtime performance
+        # https://github.com/python/cpython/issues/130090
+        "/p:PlatformToolset=ClangCL",
     ]
 
     if freethreaded:

Original file line number	Diff line number	Diff line change
`@@ -653,6 +653,9 @@ def run_msbuild(`
`653`	`653`	`# This can also work around known incompatibilities with the Windows 11`
`654`	`654`	`# SDK as of at least CPython 3.9.7.`
`655`	`655`	`f"/property:DefaultWindowsSDKVersion={windows_sdk_version}",`
	`656`	`+ # Use ClangCL for better build and runtime performance`
	`657`	`+ # https://github.com/python/cpython/issues/130090`
	`658`	`+ "/p:PlatformToolset=ClangCL",`
`656`	`659`	`]`
`657`	`660`
`658`	`661`	`if freethreaded:`