0022-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.m | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ggml/src/ggml-metal/ggml-metal.m b/ggml/src/ggml-metal/ggml-metal.m
index 110c9ece..ab46f6e3 100644
--- a/ggml/src/ggml-metal/ggml-metal.m
+++ b/ggml/src/ggml-metal/ggml-metal.m
@@ -89,7 +89,11 @@ static id<MTLDevice> ggml_backend_metal_device_acq(struct ggml_backend_metal_dev
         ctx->has_bfloat |= [ctx->mtl_device supportsFamily:MTLGPUFamilyApple6];
 
 #if defined(GGML_METAL_USE_BF16)
-        ctx->use_bfloat = ctx->has_bfloat;
+        if (@available(macOS 14.0, *)) {
+            ctx->use_bfloat = ctx->has_bfloat;
+        } else {
+            ctx->use_bfloat = false;
+        }
 #else
         ctx->use_bfloat = false;
 #endif