From d606ba2c123826f153bbd037cf46e80b5eb8dc3e Mon Sep 17 00:00:00 2001
From: Niyas Sait <niyas.sait@linaro.org>
Date: Wed, 23 Mar 2022 17:58:01 +0000
Subject: [PATCH] enable windows/arm64 go build with bazel (#3072)

---
 go/private/platforms.bzl | 2 ++
 go/private/sdk.bzl       | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/go/private/platforms.bzl b/go/private/platforms.bzl
index ee2c7accba..21a62e90da 100644
--- a/go/private/platforms.bzl
+++ b/go/private/platforms.bzl
@@ -83,6 +83,7 @@ GOOS_GOARCH = (
     ("windows", "386"),
     ("windows", "amd64"),
     ("windows", "arm"),
+    ("windows", "arm64"),
 )
 
 RACE_GOOS_GOARCH = {
@@ -135,6 +136,7 @@ CGO_GOOS_GOARCH = {
     ("solaris", "amd64"): None,
     ("windows", "386"): None,
     ("windows", "amd64"): None,
+    ("windows", "arm64"): None,
 }
 
 def _generate_constraints(names, bazel_constraints):
diff --git a/go/private/sdk.bzl b/go/private/sdk.bzl
index 7c73c116ee..4189d81989 100644
--- a/go/private/sdk.bzl
+++ b/go/private/sdk.bzl
@@ -276,7 +276,11 @@ def _detect_host_platform(ctx):
         # Default to amd64 when uname doesn't return a known value.
 
     elif ctx.os.name.startswith("windows"):
-        goos, goarch = "windows", "amd64"
+        goos = "windows"
+        if ctx.os.environ.get("PROCESSOR_ARCHITECTURE") == "ARM64" or ctx.os.environ.get("PROCESSOR_ARCHITEW6432") == "ARM64":
+            goarch = "arm64"
+        else:
+            goarch = "amd64"
     elif ctx.os.name == "freebsd":
         goos, goarch = "freebsd", "amd64"
     else: