From 1213fe79d8160f879e982c9aebe5f12dad190d54 Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 14 Jun 2019 13:56:42 -0700
Subject: [PATCH] Worked around "Undefined symbol:
 ___isPlatformVersionAtLeast()" link error on Xcode 11 beta

---
 src/render/metal/SDL_render_metal.m       | 9 +++++----
 src/video/uikit/SDL_uikitvideo.m          | 5 ++++-
 src/video/uikit/SDL_uikitviewcontroller.m | 5 ++++-
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 3a85cad269a54..9233b8fee3c32 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1733,11 +1733,12 @@ - (void)dealloc
 #endif
 #else
 #ifdef __IPHONE_11_0
-    if (@available(iOS 11.0, *)) {
-        if ([mtldevice supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily4_v1]) {
-            maxtexsize = 16384;
-        }
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability-new"
+    if ([mtldevice supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily4_v1]) {
+        maxtexsize = 16384;
     } else
+#pragma clang diagnostic pop
 #endif
 #ifdef __IPHONE_10_0
     if ([mtldevice supportsFeatureSet:MTLFeatureSet_iOS_GPUFamily3_v1]) {
diff --git a/src/video/uikit/SDL_uikitvideo.m b/src/video/uikit/SDL_uikitvideo.m
index 7c21d16c2de3a..34b63f7b74677 100644
--- a/src/video/uikit/SDL_uikitvideo.m
+++ b/src/video/uikit/SDL_uikitvideo.m
@@ -230,10 +230,13 @@ static void UIKit_DeleteDevice(SDL_VideoDevice * device)
     if (focus) {
         SDL_WindowData *data = (__bridge SDL_WindowData *) focus->driverdata;
         if (data != nil) {
-            if (@available(iOS 11.0, *)) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability-new"
+            if ([data.viewcontroller respondsToSelector:@selector(setNeedsUpdateOfHomeIndicatorAutoHidden)]) {
                 [data.viewcontroller performSelectorOnMainThread:@selector(setNeedsUpdateOfHomeIndicatorAutoHidden) withObject:nil waitUntilDone:NO];
                 [data.viewcontroller performSelectorOnMainThread:@selector(setNeedsUpdateOfScreenEdgesDeferringSystemGestures) withObject:nil waitUntilDone:NO];
             }
+#pragma clang diagnostic pop
         }
     }
 #endif /* !TARGET_OS_TV */
diff --git a/src/video/uikit/SDL_uikitviewcontroller.m b/src/video/uikit/SDL_uikitviewcontroller.m
index e1f4cdc45c0e4..17221ebb06b04 100644
--- a/src/video/uikit/SDL_uikitviewcontroller.m
+++ b/src/video/uikit/SDL_uikitviewcontroller.m
@@ -57,10 +57,13 @@
     @autoreleasepool {
         SDL_uikitviewcontroller *viewcontroller = (__bridge SDL_uikitviewcontroller *) userdata;
         viewcontroller.homeIndicatorHidden = (hint && *hint) ? SDL_atoi(hint) : -1;
-        if (@available(iOS 11.0, *)) {
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wunguarded-availability-new"
+        if ([viewcontroller respondsToSelector:@selector(setNeedsUpdateOfHomeIndicatorAutoHidden)]) {
             [viewcontroller setNeedsUpdateOfHomeIndicatorAutoHidden];
             [viewcontroller setNeedsUpdateOfScreenEdgesDeferringSystemGestures];
         }
+#pragma clang diagnostic pop
     }
 }
 #endif