Add ARM64 Windows builds for Python 3.11+

.github/workflows/windows.yml

@@ -92,6 +92,7 @@ jobs:
           fi
 
   build:
+    timeout-minutes: 60
     needs:
       - generate-matrix
       - pythonbuild

ci-runners.yaml

@@ -35,3 +35,8 @@ windows-latest:
   arch: x86_64
   platform: windows
   free: true
+
+windows-11-arm:
+  arch: aarch64
+  platform: windows
+  free: false

ci-targets.yaml

@@ -384,3 +384,21 @@ windows:
       - options:
           - freethreaded+pgo
         minimum-python-version: "3.13"
+
+  aarch64-pc-windows-msvc:
+    arch: aarch64
+    vcvars: vcvarsamd64_arm64.bat
+    python_versions:
+      # On 3.9 / 3.10, `_tkinter` is failing to be included in the build
+      # - "3.9"
+      # - "3.10"
+      - "3.11"
+      - "3.12"
+      - "3.13"
+      - "3.14"
+    build_options:
+      - pgo
+    build_options_conditional:
+      - options:
+          - freethreaded+pgo
+        minimum-python-version: "3.13"

cpython-windows/build.py

@@ -370,7 +370,7 @@ def hack_props(
 
     mpdecimal_version = DOWNLOADS["mpdecimal"]["version"]
 
-    if meets_python_minimum_version(python_version, "3.14"):
+    if meets_python_minimum_version(python_version, "3.14") or arch == "arm64":
         tcltk_commit = DOWNLOADS["tk-windows-bin"]["git_commit"]
     else:
         tcltk_commit = DOWNLOADS["tk-windows-bin-8612"]["git_commit"]
@@ -464,6 +464,8 @@ def hack_props(
         suffix = b"-x64"
     elif arch == "win32":
         suffix = b""
+    elif arch == "arm64":
+        suffix = b""
     else:
         raise Exception("unhandled architecture: %s" % arch)
 
@@ -505,6 +507,7 @@ def hack_project_files(
     build_directory: str,
     python_version: str,
     zlib_entry: str,
+    arch: str,
 ):
     """Hacks Visual Studio project files to work with our build."""
 
@@ -518,6 +521,17 @@ def hack_project_files(
         zlib_entry,
     )
 
+    # `--include-tcltk` is forced off on arm64, undo that
+    # See https://github.com/python/cpython/pull/132650
+    try:
+        static_replace_in_file(
+            cpython_source_path / "PC" / "layout" / "main.py",
+            rb'if ns.arch in ("arm32", "arm64"):',
+            rb'if ns.arch == "arm32":',
+        )
+    except NoSearchStringError:
+        pass
+
     # Our SQLite directory is named weirdly. This throws off version detection
     # in the project file. Replace the parsing logic with a static string.
     sqlite3_version = DOWNLOADS["sqlite"]["actual_version"].encode("ascii")
@@ -603,14 +617,18 @@ def hack_project_files(
     # have a standalone zlib DLL, so we remove references to it. For Python
     # 3.14+, we're using tk-windows-bin 8.6.14 which includes a prebuilt zlib
     # DLL, so we skip this patch there.
-    if meets_python_minimum_version(
-        python_version, "3.12"
-    ) and meets_python_maximum_version(python_version, "3.13"):
-        static_replace_in_file(
-            pcbuild_path / "_tkinter.vcxproj",
-            rb'<_TclTkDLL Include="$(tcltkdir)\bin\$(tclZlibDllName)" />',
-            rb"",
-        )
+    # On arm64, we use the new version of tk-windows-bin for all versions.
+    if meets_python_minimum_version(python_version, "3.12") and (
+        meets_python_maximum_version(python_version, "3.13") or arch == "arm64"
+    ):
+        try:
+            static_replace_in_file(
+                pcbuild_path / "_tkinter.vcxproj",
+                rb'<_TclTkDLL Include="$(tcltkdir)\bin\$(tclZlibDllName)" />',
+                rb"",
+            )
+        except NoSearchStringError:
+            pass
 
     # We don't need to produce python_uwp.exe and its *w variant. Or the
     # python3.dll, pyshellext, or pylauncher.
@@ -730,9 +748,11 @@ def build_openssl_for_arch(
     elif arch == "amd64":
         configure = "VC-WIN64A"
         prefix = "64"
+    elif arch == "arm64":
+        configure = "VC-WIN64-ARM"
+        prefix = "arm64"
     else:
-        print("invalid architecture: %s" % arch)
-        sys.exit(1)
+        raise Exception("unhandled architecture: %s" % arch)
 
     # The official CPython OpenSSL builds hack ms/uplink.c to change the
     # ``GetModuleHandle(NULL)`` invocation to load things from _ssl.pyd
@@ -780,6 +800,12 @@ def build_openssl_for_arch(
         log("copying %s to %s" % (source, dest))
         shutil.copyfile(source, dest)
 
+    # Copy `applink.c` to the include directory.
+    source_applink = source_root / "ms" / "applink.c"
+    dest_applink = install_root / "include" / "openssl" / "applink.c"
+    log("copying %s to %s" % (source_applink, dest_applink))
+    shutil.copyfile(source_applink, dest_applink)
+
 
 def build_openssl(
     entry: str,
@@ -801,6 +827,7 @@ def build_openssl(
 
         root_32 = td / "x86"
         root_64 = td / "x64"
+        root_arm64 = td / "arm64"
 
         if arch == "x86":
             root_32.mkdir()
@@ -824,13 +851,28 @@ def build_openssl(
                 root_64,
                 jom_archive=jom_archive,
             )
+        elif arch == "arm64":
+            root_arm64.mkdir()
+            build_openssl_for_arch(
+                perl_path,
+                "arm64",
+                openssl_archive,
+                openssl_version,
+                nasm_archive,
+                root_arm64,
+                jom_archive=jom_archive,
+            )
         else:
-            raise ValueError("unhandled arch: %s" % arch)
+            raise Exception("unhandled architecture: %s" % arch)
 
         install = td / "out"
 
         if arch == "x86":
             shutil.copytree(root_32 / "install" / "32", install / "openssl" / "win32")
+        elif arch == "arm64":
+            shutil.copytree(
+                root_arm64 / "install" / "arm64", install / "openssl" / "arm64"
+            )
         else:
             shutil.copytree(root_64 / "install" / "64", install / "openssl" / "amd64")
 
@@ -901,9 +943,14 @@ def build_libffi(
         if arch == "x86":
             args.append("-x86")
             artifacts_path = ffi_source_path / "i686-pc-cygwin"
-        else:
+        elif arch == "arm64":
+            args.append("-arm64")
+            artifacts_path = ffi_source_path / "aarch64-w64-cygwin"
+        elif arch == "amd64":
             args.append("-x64")
             artifacts_path = ffi_source_path / "x86_64-w64-cygwin"
+        else:
+            raise Exception("unhandled architecture: %s" % arch)
 
         subprocess.run(args, env=env, check=True)
 
@@ -1069,8 +1116,10 @@ def find_additional_dependencies(project: pathlib.Path):
         abi_platform = "win_amd64"
     elif arch == "win32":
         abi_platform = "win32"
+    elif arch == "arm64":
+        abi_platform = "win_arm64"
     else:
-        raise ValueError("unhandled arch: %s" % arch)
+        raise Exception("unhandled architecture: %s" % arch)
 
     if freethreaded:
         abi_tag = ".cp%st-%s" % (python_majmin, abi_platform)
@@ -1171,8 +1220,8 @@ def find_additional_dependencies(project: pathlib.Path):
                 if name == "zlib":
                     name = zlib_entry
 
-                # On 3.14+, we use the latest tcl/tk version
-                if ext == "_tkinter" and python_majmin == "314":
+                # On 3.14+ and aarch64, we use the latest tcl/tk version
+                if ext == "_tkinter" and (python_majmin == "314" or arch == "arm64"):
                     name = name.replace("-8612", "")
 
                 download_entry = DOWNLOADS[name]
@@ -1258,16 +1307,18 @@ def build_cpython(
     setuptools_wheel = download_entry("setuptools", BUILD)
     pip_wheel = download_entry("pip", BUILD)
 
-    # On CPython 3.14+, we use the latest tcl/tk version which has additional runtime
-    # dependencies, so we are conservative and use the old version elsewhere.
-    if meets_python_minimum_version(python_version, "3.14"):
-        tk_bin_archive = download_entry(
-            "tk-windows-bin", BUILD, local_name="tk-windows-bin.tar.gz"
-        )
-    else:
-        tk_bin_archive = download_entry(
-            "tk-windows-bin-8612", BUILD, local_name="tk-windows-bin.tar.gz"
-        )
+    # On CPython 3.14+, we use the latest tcl/tk version which has additional
+    # runtime dependencies, so we are conservative and use the old version
+    # elsewhere. The old version isn't built for arm64, so we use the new
+    # version there too
+    tk_bin_entry = (
+        "tk-windows-bin"
+        if meets_python_minimum_version(python_version, "3.14") or arch == "arm64"
+        else "tk-windows-bin-8612"
+    )
+    tk_bin_archive = download_entry(
+        tk_bin_entry, BUILD, local_name="tk-windows-bin.tar.gz"
+    )
 
     # On CPython 3.14+, zstd is included
     if meets_python_minimum_version(python_version, "3.14"):
@@ -1297,8 +1348,11 @@ def build_cpython(
     elif arch == "x86":
         build_platform = "win32"
         build_directory = "win32"
+    elif arch == "arm64":
+        build_platform = "arm64"
+        build_directory = "arm64"
     else:
-        raise ValueError("unhandled arch: %s" % arch)
+        raise Exception("unhandled architecture: %s" % arch)
 
     tempdir_opts = (
         {"ignore_cleanup_errors": True} if sys.version_info >= (3, 12) else {}
@@ -1332,7 +1386,7 @@ def build_cpython(
 
         # We need all the OpenSSL library files in the same directory to appease
         # install rules.
-        openssl_arch = {"amd64": "amd64", "x86": "win32"}[arch]
+        openssl_arch = {"amd64": "amd64", "x86": "win32", "arm64": "arm64"}[arch]
         openssl_root = td / "openssl" / openssl_arch
         openssl_bin_path = openssl_root / "bin"
         openssl_lib_path = openssl_root / "lib"
@@ -1346,6 +1400,17 @@ def build_cpython(
             log("copying %s to %s" % (source, dest))
             shutil.copyfile(source, dest)
 
+        # Delete the tk nmake helper, it's not needed and links msvc
+        tcltk_commit: str = DOWNLOADS[tk_bin_entry]["git_commit"]
+        tcltk_path = td / ("cpython-bin-deps-%s" % tcltk_commit)
+        (
+            tcltk_path
+            / build_directory
+            / "lib"
+            / "nmake"
+            / "x86_64-w64-mingw32-nmakehlp.exe"
+        ).unlink()
+
         cpython_source_path = td / ("Python-%s" % python_version)
         pcbuild_path = cpython_source_path / "PCbuild"
 
@@ -1368,6 +1433,7 @@ def build_cpython(
             build_directory,
             python_version=python_version,
             zlib_entry=zlib_entry,
+            arch=arch,
         )
 
         if pgo:
@@ -1790,9 +1856,14 @@ def main() -> None:
         if os.environ.get("Platform") == "x86":
             target_triple = "i686-pc-windows-msvc"
             arch = "x86"
-        else:
+        elif os.environ.get("Platform") == "arm64":
+            target_triple = "aarch64-pc-windows-msvc"
+            arch = "arm64"
+        elif os.environ.get("Platform") == "x64":
             target_triple = "x86_64-pc-windows-msvc"
             arch = "amd64"
+        else:
+            raise Exception("unhandled architecture: %s" % os.environ.get("Platform"))
 
         # TODO need better dependency checking.
 

src/validation.rs

@@ -18,7 +18,7 @@ use {
             macho::{LoadCommandVariant, MachHeader, Nlist},
             pe::{ImageNtHeaders, PeFile, PeFile32, PeFile64},
         },
-        Endianness, FileKind, Object, SectionIndex, SymbolScope,
+        Architecture, Endianness, FileKind, Object, SectionIndex, SymbolScope,
     },
     once_cell::sync::Lazy,
     std::{
@@ -33,6 +33,7 @@ use {
 const RECOGNIZED_TRIPLES: &[&str] = &[
     "aarch64-apple-darwin",
     "aarch64-apple-ios",
+    "aarch64-pc-windows-msvc",
     "aarch64-unknown-linux-gnu",
     "armv7-unknown-linux-gnueabi",
     "armv7-unknown-linux-gnueabihf",
@@ -117,11 +118,13 @@ const PE_ALLOWED_LIBRARIES: &[&str] = &[
     "libcrypto-1_1.dll",
     "libcrypto-1_1-x64.dll",
     "libcrypto-3.dll",
+    "libcrypto-3-arm64.dll",
     "libcrypto-3-x64.dll",
     "libffi-8.dll",
     "libssl-1_1.dll",
     "libssl-1_1-x64.dll",
     "libssl-3.dll",
+    "libssl-3-arm64.dll",
     "libssl-3-x64.dll",
     "python3.dll",
     "python39.dll",
@@ -137,8 +140,14 @@ const PE_ALLOWED_LIBRARIES: &[&str] = &[
     "tk86t.dll",
 ];
 
-// CPython 3.14 uses tcl/tk 8.6.14+ which includes a bundled zlib and dynamically links to msvcrt.
-const PE_ALLOWED_LIBRARIES_314: &[&str] = &["msvcrt.dll", "zlib1.dll"];
+// CPython 3.14 and ARM64 use a newer version of tcl/tk (8.6.14+) which includes a bundled zlib that
+// dynamically links some system libraries
+const PE_ALLOWED_LIBRARIES_314: &[&str] = &[
+    "zlib1.dll",
+    "api-ms-win-crt-private-l1-1-0.dll", // zlib loads this library on arm64, 3.14+
+    "msvcrt.dll",                        // zlib loads this library
+];
+const PE_ALLOWED_LIBRARIES_ARM64: &[&str] = &["msvcrt.dll", "zlib1.dll"];
 
 static GLIBC_MAX_VERSION_BY_TRIPLE: Lazy<HashMap<&'static str, version_compare::Version<'static>>> =
     Lazy::new(|| {
@@ -496,6 +505,7 @@ static PLATFORM_TAG_BY_TRIPLE: Lazy<HashMap<&'static str, &'static str>> = Lazy:
     [
         ("aarch64-apple-darwin", "macosx-11.0-arm64"),
         ("aarch64-apple-ios", "iOS-aarch64"),
+        ("aarch64-pc-windows-msvc", "win-arm64"),
         ("aarch64-unknown-linux-gnu", "linux-aarch64"),
         ("armv7-unknown-linux-gnueabi", "linux-arm"),
         ("armv7-unknown-linux-gnueabihf", "linux-arm"),
@@ -1375,15 +1385,17 @@ fn validate_pe<'data, Pe: ImageNtHeaders>(
             let lib = String::from_utf8(lib.to_vec())?;
 
             match python_major_minor {
-                "3.9" | "3.10" | "3.11" | "3.12" | "3.13" => {}
+                "3.11" | "3.12" | "3.13" if pe.architecture() == Architecture::Aarch64 => {
+                    if PE_ALLOWED_LIBRARIES_ARM64.contains(&lib.as_str()) {
+                        continue;
+                    }
+                }
                 "3.14" => {
                     if PE_ALLOWED_LIBRARIES_314.contains(&lib.as_str()) {
                         continue;
                     }
                 }
-                _ => {
-                    panic!("unhandled Python version: {}", python_major_minor);
-                }
+                _ => {}
             }
 
             if !PE_ALLOWED_LIBRARIES.contains(&lib.as_str()) {