From 151028f455a486ea80505b510bd07417f2cdcadd Mon Sep 17 00:00:00 2001
From: Artemis Tosini <me@artem.ist>
Date: Fri, 22 Nov 2024 03:51:40 +0000
Subject: [PATCH] freebsd: Add support for aarch64

Add a new `aarch64-freebsd` double and example system,
then fix include and libc to work.
This is enough to build packages like `hello`,
either static or dynamic.

This is useful for testing nix FreeBSD on a Raspberry Pi.
---
 lib/systems/doubles.nix                               | 2 +-
 lib/systems/examples.nix                              | 5 +++++
 pkgs/os-specific/bsd/freebsd/pkgs/include/package.nix | 3 +++
 pkgs/os-specific/bsd/freebsd/pkgs/libc/package.nix    | 2 ++
 4 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/systems/doubles.nix b/lib/systems/doubles.nix
index f60c6a8addef21..a753c835c81070 100644
--- a/lib/systems/doubles.nix
+++ b/lib/systems/doubles.nix
@@ -13,7 +13,7 @@ let
     "x86_64-darwin" "i686-darwin" "aarch64-darwin" "armv7a-darwin"
 
     # FreeBSD
-    "i686-freebsd" "x86_64-freebsd"
+    "i686-freebsd" "x86_64-freebsd" "aarch64-freebsd"
 
     # Genode
     "aarch64-genode" "i686-genode" "x86_64-genode"
diff --git a/lib/systems/examples.nix b/lib/systems/examples.nix
index 20f96f0849d168..441f89ba100ba5 100644
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -334,6 +334,11 @@ rec {
 
   # BSDs
 
+  aarch64-freebsd = {
+    config = "aarch64-unknown-freebsd";
+    useLLVM = true;
+  };
+
   x86_64-freebsd = {
     config = "x86_64-unknown-freebsd";
     useLLVM = true;
diff --git a/pkgs/os-specific/bsd/freebsd/pkgs/include/package.nix b/pkgs/os-specific/bsd/freebsd/pkgs/include/package.nix
index a7ceb0cdf384fb..27ef73554e4811 100644
--- a/pkgs/os-specific/bsd/freebsd/pkgs/include/package.nix
+++ b/pkgs/os-specific/bsd/freebsd/pkgs/include/package.nix
@@ -1,4 +1,5 @@
 {
+  stdenv,
   lib,
   mkDerivation,
   buildPackages,
@@ -14,6 +15,8 @@ mkDerivation {
     "contrib/libc-vis"
     "etc/mtree/BSD.include.dist"
     "sys"
+  ] ++ lib.optionals stdenv.isAarch64 [
+    "lib/msun/arm"
   ];
 
   extraNativeBuildInputs = [
diff --git a/pkgs/os-specific/bsd/freebsd/pkgs/libc/package.nix b/pkgs/os-specific/bsd/freebsd/pkgs/libc/package.nix
index 7ff10d065785b8..eb34e96a4f89bf 100644
--- a/pkgs/os-specific/bsd/freebsd/pkgs/libc/package.nix
+++ b/pkgs/os-specific/bsd/freebsd/pkgs/libc/package.nix
@@ -106,6 +106,8 @@ mkDerivation {
       "include/paths.h"
 
       "lib/libdl"
+    ] ++ lib.optionals stdenv.hostPlatform.isAarch64 [
+      "contrib/arm-optimized-routines"
     ];
 
   postPatch = ''