From 08b59753d4263b8c781448989e26f6374afb7909 Mon Sep 17 00:00:00 2001
From: Oliver Pajonk <oliver.pajonk@elektrobit.com>
Date: Wed, 18 Mar 2026 14:29:54 +0100
Subject: [PATCH] Add support for aarch64 ACL

Currently, the ACL dependency is hard-coded to x86_64. For aarch64, the library location is a bit different and a different binary package must be used. This PR introduces both fixes and adds an auto-selection of the right codepath, depending on the CPU.
---
 MODULE.bazel            | 7 +++++++
 externals/acl/BUILD     | 5 ++++-
 externals/acl/acl.BUILD | 7 ++++---
 3 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/MODULE.bazel b/MODULE.bazel
index ed1295ed..085467f0 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -109,6 +109,13 @@ deb(
     visibility = ["//visibility:public"],
 )
 
+deb(
+    name = "acl-deb-aarch64",
+    build = "//externals/acl:acl.BUILD",
+    urls = ["https://launchpadlibrarian.net/581258948/libacl1-dev_2.3.1-1_arm64.deb"],
+    visibility = ["//visibility:public"],
+)
+
 PYTHON_VERSION = "3.12"
 
 python = use_extension("@rules_python//python/extensions:python.bzl", "python", dev_dependency = True)
diff --git a/externals/acl/BUILD b/externals/acl/BUILD
index b71d5df1..da079950 100644
--- a/externals/acl/BUILD
+++ b/externals/acl/BUILD
@@ -1,5 +1,8 @@
 alias(
     name = "acl",
-    actual = "@acl-deb//:acl",
+    actual = select({
+        "@platforms//cpu:aarch64": "@acl-deb-aarch64//:acl",
+        "//conditions:default": "@acl-deb//:acl",
+    }),
     visibility = ["//visibility:public"],
 )
diff --git a/externals/acl/acl.BUILD b/externals/acl/acl.BUILD
index 718726c6..b695a6ac 100644
--- a/externals/acl/acl.BUILD
+++ b/externals/acl/acl.BUILD
@@ -1,8 +1,9 @@
 cc_library(
     name = "acl",
-    srcs = [
-        "usr/lib/libacl.a",
-    ],
+    srcs = select({
+        "@platforms//cpu:aarch64": ["usr/lib/aarch64-linux-gnu/libacl.a"],
+        "//conditions:default": ["usr/lib/libacl.a"],
+    }),
     hdrs = [
         "usr/include/acl/libacl.h",
         "usr/include/sys/acl.h",