From 180d3ca9ab4e2384591c7e3da85cd2e64745f289 Mon Sep 17 00:00:00 2001
From: John Cater <jcater@engflow.com>
Date: Thu, 24 Sep 2026 15:56:49 +0200
Subject: [PATCH] Add a build test of a basic `apple_metal_library` target.

---
 ios/BUILD            | 18 +++++++++++++++++-
 ios/sample.metal     |  5 +++++
 ios/shader_defines.h |  6 ++++++
 3 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 ios/sample.metal
 create mode 100644 ios/shader_defines.h

diff --git a/ios/BUILD b/ios/BUILD
index 37c3c44..64f135d 100644
--- a/ios/BUILD
+++ b/ios/BUILD
@@ -1,6 +1,7 @@
 load("@bazel_skylib//rules:build_test.bzl", "build_test")
 load("@rules_apple//apple:ios.bzl", "ios_application", "ios_ui_test", "ios_unit_test")
-load("@rules_apple//apple:macos.bzl", "macos_unit_test")
+load("@rules_apple//apple:macos.bzl", "macos_build_test", "macos_unit_test")
+load("@rules_apple//apple:resources.bzl", "apple_metal_library")
 load("@rules_swift//swift:swift.bzl", "swift_library")
 
 swift_library(
@@ -63,3 +64,18 @@ macos_unit_test(
     ],
     deps = [":HelloTestLib"],
 )
+
+apple_metal_library(
+    name = "SampleMetal",
+    srcs = ["sample.metal"],
+    out = "Sample.metallib",
+    hdrs = ["shader_defines.h"],
+)
+
+macos_build_test(
+    name = "SampleMetalBuildTest",
+    minimum_os_version = "14.0",
+    targets = [
+        ":SampleMetal",
+    ],
+)
diff --git a/ios/sample.metal b/ios/sample.metal
new file mode 100644
index 0000000..72f7c6b
--- /dev/null
+++ b/ios/sample.metal
@@ -0,0 +1,5 @@
+#include <metal_stdlib>
+
+using namespace metal;
+
+// Just exists to make the compiler do some work.
diff --git a/ios/shader_defines.h b/ios/shader_defines.h
new file mode 100644
index 0000000..e8a668f
--- /dev/null
+++ b/ios/shader_defines.h
@@ -0,0 +1,6 @@
+#ifndef SHADER_DEFINES_H
+#define SHADER_DEFINES_H
+
+// Just exists to make the compiler do some work.
+
+#endif