From 623bfde0079bbcbe64eecca5bffbb4ae68d8c879 Mon Sep 17 00:00:00 2001
From: Hajime Hoshi <hajimehoshi@gmail.com>
Date: Wed, 2 Jan 2019 01:16:54 +0900
Subject: [PATCH] graphicsdriver/metal/ca: Suppress warnings (#767)

---
 internal/graphicsdriver/metal/ca/ca.m | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/internal/graphicsdriver/metal/ca/ca.m b/internal/graphicsdriver/metal/ca/ca.m
index 9609820f6..4b04a06b4 100644
--- a/internal/graphicsdriver/metal/ca/ca.m
+++ b/internal/graphicsdriver/metal/ca/ca.m
@@ -48,8 +48,11 @@ const char *MetalLayer_SetMaximumDrawableCount(void *metalLayer,
                                                uint_t maximumDrawableCount) {
   if (@available(macOS 10.13.2, *)) {
     @try {
-      [((CAMetalLayer *)metalLayer)
-          setMaximumDrawableCount:(NSUInteger)maximumDrawableCount];
+      if ([(CAMetalLayer *)metalLayer
+              respondsToSelector:@selector(setMaximumDrawableCount:)]) {
+        [((CAMetalLayer *)metalLayer)
+            setMaximumDrawableCount:(NSUInteger)maximumDrawableCount];
+      }
     } @catch (NSException *exception) {
       return exception.reason.UTF8String;
     }
@@ -60,7 +63,10 @@ const char *MetalLayer_SetMaximumDrawableCount(void *metalLayer,
 void MetalLayer_SetDisplaySyncEnabled(void *metalLayer,
                                       BOOL displaySyncEnabled) {
   if (@available(macOS 10.13, *)) {
-    [((CAMetalLayer *)metalLayer) setDisplaySyncEnabled:displaySyncEnabled];
+    if ([(CAMetalLayer *)metalLayer
+            respondsToSelector:@selector(setDisplaySyncEnabled:)]) {
+      [((CAMetalLayer *)metalLayer) setDisplaySyncEnabled:displaySyncEnabled];
+    }
   }
 }