From 480c3c4d0a61d13fea9b90f575a836d2ec1c1c29 Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Thu, 3 Nov 2022 14:41:28 +0100
Subject: [PATCH 1/2] compiler_rt: fix duplicate symbol error when linking libc
 on arm64 Windows

---
 lib/compiler_rt/stack_probe.zig | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/compiler_rt/stack_probe.zig b/lib/compiler_rt/stack_probe.zig
index 5ebb851825..22f0f936ce 100644
--- a/lib/compiler_rt/stack_probe.zig
+++ b/lib/compiler_rt/stack_probe.zig
@@ -18,15 +18,15 @@ comptime {
         if (is_mingw) {
             @export(_chkstk, .{ .name = "_alloca", .linkage = strong_linkage });
             @export(___chkstk_ms, .{ .name = "___chkstk_ms", .linkage = strong_linkage });
+
+            if (arch.isAARCH64()) {
+                @export(__chkstk, .{ .name = "__chkstk", .linkage = strong_linkage });
+            }
         } else if (!builtin.link_libc) {
             // This symbols are otherwise exported by MSVCRT.lib
             @export(_chkstk, .{ .name = "_chkstk", .linkage = strong_linkage });
             @export(__chkstk, .{ .name = "__chkstk", .linkage = strong_linkage });
         }
-
-        if (arch.isAARCH64()) {
-            @export(__chkstk, .{ .name = "__chkstk", .linkage = strong_linkage });
-        }
     }
 
     switch (arch) {

From 34652038248ff209e4bee60bcd2d7299404b15fe Mon Sep 17 00:00:00 2001
From: Jakub Konka <kubkon@jakubkonka.com>
Date: Thu, 3 Nov 2022 15:07:31 +0100
Subject: [PATCH 2/2] libc: add support for arm64 msvc installation

---
 src/libc_installation.zig | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libc_installation.zig b/src/libc_installation.zig
index f9f6b37fba..58910ba12f 100644
--- a/src/libc_installation.zig
+++ b/src/libc_installation.zig
@@ -411,6 +411,7 @@ pub const LibCInstallation = struct {
             .i386 => "x86",
             .x86_64 => "x64",
             .arm, .armeb => "arm",
+            .aarch64 => "arm64",
             else => return error.UnsupportedArchitecture,
         };
 
@@ -474,6 +475,7 @@ pub const LibCInstallation = struct {
             .i386 => "x86",
             .x86_64 => "x64",
             .arm, .armeb => "arm",
+            .aarch64 => "arm64",
             else => return error.UnsupportedArchitecture,
         };