0018-BF16-macos-version-guard.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Hiltgen <daniel@ollama.com>
Date: Wed, 30 Jul 2025 08:43:46 -0700
Subject: [PATCH] BF16 macos version guard

Only enable BF16 on supported MacOS versions (v14+)
---
 ggml/src/ggml-metal/ggml-metal-context.m | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ggml/src/ggml-metal/ggml-metal-context.m b/ggml/src/ggml-metal/ggml-metal-context.m
index 052efb7ac..b47dc7879 100644
--- a/ggml/src/ggml-metal/ggml-metal-context.m
+++ b/ggml/src/ggml-metal/ggml-metal-context.m
@@ -125,7 +125,12 @@ ggml_metal_t ggml_metal_init(ggml_metal_device_t dev) {
 
     res->d_queue = dispatch_queue_create("ggml-metal", DISPATCH_QUEUE_CONCURRENT);
 
-    res->use_bfloat      = props_dev->has_bfloat;
+    if (@available(macOS 14.0, *)) {
+        res->use_bfloat = props_dev->has_bfloat;
+    } else {
+        res->use_bfloat = false;
+    }
+
     res->use_fusion      = getenv("GGML_METAL_FUSION_DISABLE") == nil;
     res->use_concurrency = getenv("GGML_METAL_CONCURRENCY_DISABLE") == nil;