From 87873c5417110c6ac5ad1f6d4c44c11270948df3 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 23 Jan 2026 12:04:18 -0800
Subject: [PATCH] Handle windows-on-arm `ARM64` host arch in cmake

It seems CMake doesn't help normalize anything in this regard.
---
 cmake/ba-download.cmake | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/cmake/ba-download.cmake b/cmake/ba-download.cmake
index c3e2dc46f..967a7c87e 100644
--- a/cmake/ba-download.cmake
+++ b/cmake/ba-download.cmake
@@ -9,6 +9,8 @@ function(ba_download target repo version)
     set(arch "aarch64")
   elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "AMD64")
     set(arch "x86_64")
+  elseif (CMAKE_HOST_SYSTEM_PROCESSOR STREQUAL "ARM64")
+    set(arch "aarch64")
   else()
     set(arch "UNKNOWN_ARCH")
     message(WARNING "Unsupported architecture ${CMAKE_HOST_SYSTEM_PROCESSOR} for ${target}")