From f31c7086d8896f02cfc2eb68673f38c8c7dc562e Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <slime73@gmail.com>
Date: Sun, 25 Sep 2016 15:02:06 -0300
Subject: [PATCH] Enable SDL_LoadObject on iOS 8+ and tvOS.

---
 include/SDL_config_iphoneos.h          |  6 +-----
 premake/Xcode-iOS/SDL_config_premake.h |  4 ++--
 premake/projects/SDL2.lua              |  2 +-
 src/loadso/dlopen/SDL_sysloadso.c      | 18 ++++++++++++++++--
 src/video/uikit/SDL_uikitvideo.h       | 13 +++++++++----
 src/video/uikit/SDL_uikitvideo.m       |  2 +-
 6 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/include/SDL_config_iphoneos.h b/include/SDL_config_iphoneos.h
index 304c89201dac6..470985f80d550 100644
--- a/include/SDL_config_iphoneos.h
+++ b/include/SDL_config_iphoneos.h
@@ -119,11 +119,7 @@
 #define SDL_JOYSTICK_MFI 1
 
 /* Enable Unix style SO loading */
-/* Technically this works, but violates the iOS dev agreement prior to iOS 8 */
-/* #define SDL_LOADSO_DLOPEN 1 */
-
-/* Enable the stub shared object loader (src/loadso/dummy/\*.c) */
-#define SDL_LOADSO_DISABLED 1
+#define SDL_LOADSO_DLOPEN 1
 
 /* Enable various threading systems */
 #define SDL_THREAD_PTHREAD  1
diff --git a/premake/Xcode-iOS/SDL_config_premake.h b/premake/Xcode-iOS/SDL_config_premake.h
index c4a8a1bfa74d6..537d30510d93a 100644
--- a/premake/Xcode-iOS/SDL_config_premake.h
+++ b/premake/Xcode-iOS/SDL_config_premake.h
@@ -150,8 +150,8 @@
 #ifndef SDL_VIDEO_RENDER_OGL_ES2
 #define SDL_VIDEO_RENDER_OGL_ES2 1
 #endif
-#ifndef SDL_LOADSO_DISABLED
-#define SDL_LOADSO_DISABLED 1
+#ifndef SDL_LOADSO_DLOPEN
+#define SDL_LOADSO_DLOPEN 1
 #endif
 #ifndef SDL_HAPTIC_DISABLED
 #define SDL_HAPTIC_DISABLED 1
diff --git a/premake/projects/SDL2.lua b/premake/projects/SDL2.lua
index 2f64e0e85bcab..1ab2346b777a9 100755
--- a/premake/projects/SDL2.lua
+++ b/premake/projects/SDL2.lua
@@ -369,7 +369,7 @@ SDL_project "SDL2"
 			["SDL_AUDIO_DRIVER_COREAUDIO"] = 1,
 			["SDL_JOYSTICK_MFI"] = 1,
 			["SDL_HAPTIC_DISABLED"] = 1,
-			["SDL_LOADSO_DISABLED"] = 1,
+			["SDL_LOADSO_DLOPEN"] = 1,
 			["SDL_THREAD_PTHREAD"] = 1,
 			["SDL_THREAD_PTHREAD_RECURSIVE_MUTEX"] = 1,
 			["SDL_TIMER_UNIX"] = 1,
diff --git a/src/loadso/dlopen/SDL_sysloadso.c b/src/loadso/dlopen/SDL_sysloadso.c
index 03ffae12999a1..7b30b77350e55 100644
--- a/src/loadso/dlopen/SDL_sysloadso.c
+++ b/src/loadso/dlopen/SDL_sysloadso.c
@@ -30,11 +30,25 @@
 
 #include "SDL_loadso.h"
 
+#if SDL_VIDEO_DRIVER_UIKIT
+#include "../../video/uikit/SDL_uikitvideo.h"
+#endif
+
 void *
 SDL_LoadObject(const char *sofile)
 {
-    void *handle = dlopen(sofile, RTLD_NOW|RTLD_LOCAL);
-    const char *loaderror = (char *) dlerror();
+    void *handle;
+    const char *loaderror;
+
+#if SDL_VIDEO_DRIVER_UIKIT
+    if (!UIKit_IsSystemVersionAtLeast(8.0)) {
+        SDL_SetError("SDL_LoadObject requires iOS 8+");
+        return NULL;
+    }
+#endif
+
+    handle = dlopen(sofile, RTLD_NOW|RTLD_LOCAL);
+    loaderror = (char *) dlerror();
     if (handle == NULL) {
         SDL_SetError("Failed loading %s: %s", sofile, loaderror);
     }
diff --git a/src/video/uikit/SDL_uikitvideo.h b/src/video/uikit/SDL_uikitvideo.h
index 836cf18d0ee5b..aafb714d70d39 100644
--- a/src/video/uikit/SDL_uikitvideo.h
+++ b/src/video/uikit/SDL_uikitvideo.h
@@ -21,20 +21,25 @@
 #ifndef _SDL_uikitvideo_h
 #define _SDL_uikitvideo_h
 
-#include <UIKit/UIKit.h>
-
 #include "../SDL_sysvideo.h"
 
+#ifdef __OBJC__
+
+#include <UIKit/UIKit.h>
+
 @interface SDL_VideoData : NSObject
 
 @property (nonatomic) id pasteboardObserver;
 
 @end
 
+CGRect UIKit_ComputeViewFrame(SDL_Window *window, UIScreen *screen);
+
+#endif /* __OBJC__ */
+
 void UIKit_SuspendScreenSaver(_THIS);
 
-BOOL UIKit_IsSystemVersionAtLeast(double version);
-CGRect UIKit_ComputeViewFrame(SDL_Window *window, UIScreen *screen);
+SDL_bool UIKit_IsSystemVersionAtLeast(double version);
 
 #endif /* _SDL_uikitvideo_h */
 
diff --git a/src/video/uikit/SDL_uikitvideo.m b/src/video/uikit/SDL_uikitvideo.m
index c6d207a484889..9cfc922bc7186 100644
--- a/src/video/uikit/SDL_uikitvideo.m
+++ b/src/video/uikit/SDL_uikitvideo.m
@@ -167,7 +167,7 @@ static void UIKit_DeleteDevice(SDL_VideoDevice * device)
     }
 }
 
-BOOL
+SDL_bool
 UIKit_IsSystemVersionAtLeast(double version)
 {
     return [[UIDevice currentDevice].systemVersion doubleValue] >= version;