Fixed building on Mac OS X on the command line and with an older macOS SDK

configure

@@ -25394,7 +25394,12 @@ $as_echo "#define SDL_AUDIO_DRIVER_COREAUDIO 1" >>confdefs.h
 
 $as_echo "#define SDL_JOYSTICK_IOKIT 1" >>confdefs.h
 
+
+$as_echo "#define SDL_JOYSTICK_MFI 1" >>confdefs.h
+
             SOURCES="$SOURCES $srcdir/src/joystick/darwin/*.c"
+            SOURCES="$SOURCES $srcdir/src/joystick/iphoneos/*.m"
+            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-weak_framework,CoreHaptics -Wl,-weak_framework,GameController"
             have_joystick=yes
         fi
         # Set up files for the haptic library

configure.ac

@@ -4053,7 +4053,10 @@ AS_HELP_STRING([--enable-render-d3d], [enable the Direct3D render driver [[defau
         # Set up files for the joystick library
         if test x$enable_joystick = xyes; then
             AC_DEFINE(SDL_JOYSTICK_IOKIT, 1, [ ])
+            AC_DEFINE(SDL_JOYSTICK_MFI, 1, [ ])
             SOURCES="$SOURCES $srcdir/src/joystick/darwin/*.c"
+            SOURCES="$SOURCES $srcdir/src/joystick/iphoneos/*.m"
+            EXTRA_LDFLAGS="$EXTRA_LDFLAGS -Wl,-weak_framework,CoreHaptics -Wl,-weak_framework,GameController"
             have_joystick=yes
         fi
         # Set up files for the haptic library

include/SDL_config.h.in

@@ -289,6 +289,7 @@
 #undef SDL_JOYSTICK_XINPUT
 #undef SDL_JOYSTICK_DUMMY
 #undef SDL_JOYSTICK_IOKIT
+#undef SDL_JOYSTICK_MFI
 #undef SDL_JOYSTICK_LINUX
 #undef SDL_JOYSTICK_ANDROID
 #undef SDL_JOYSTICK_WINMM

src/haptic/darwin/SDL_syshaptic.c

@@ -28,7 +28,7 @@
 #include "../SDL_syshaptic.h"
 #include "SDL_joystick.h"
 #include "../../joystick/SDL_sysjoystick.h"     /* For the real SDL_Joystick */
-#include "../../joystick/darwin/SDL_sysjoystick_c.h"    /* For joystick hwdata */
+#include "../../joystick/darwin/SDL_iokitjoystick_c.h"    /* For joystick hwdata */
 #include "SDL_syshaptic_c.h"
 
 #include <IOKit/IOKitLib.h>

src/joystick/darwin/SDL_iokitjoystick.c

@@ -26,7 +26,7 @@
 #include "SDL_joystick.h"
 #include "../SDL_sysjoystick.h"
 #include "../SDL_joystick_c.h"
-#include "SDL_sysjoystick_c.h"
+#include "SDL_iokitjoystick_c.h"
 #include "../hidapi/SDL_hidapijoystick_c.h"
 #include "../../haptic/darwin/SDL_syshaptic_c.h"    /* For haptic hot plugging */
 

src/joystick/iphoneos/SDL_mfijoystick.m

@@ -21,7 +21,7 @@
 #include "../../SDL_internal.h"
 
 /* This is the iOS implementation of the SDL joystick API */
-#include "SDL_sysjoystick_c.h"
+#include "SDL_mfijoystick_c.h"
 
 #if !TARGET_OS_OSX
 /* needed for SDL_IPHONE_MAX_GFORCE macro */
@@ -46,6 +46,10 @@
 #import <CoreMotion/CoreMotion.h>
 #endif
 
+#if TARGET_OS_OSX
+#include <IOKit/hid/IOHIDManager.h>
+#endif
+
 #ifdef SDL_JOYSTICK_MFI
 #import <GameController/GameController.h>
 
@@ -58,6 +62,11 @@ static id disconnectObserver = nil;
 /* remove compilation warnings for strict builds by defining these selectors, even though
  * they are only ever used indirectly through objc_msgSend
  */
+@interface GCController (SDL)
+#if TARGET_OS_OSX && (__MAC_OS_X_VERSION_MAX_ALLOWED <= 101600)
++ (BOOL)supportsHIDDevice:(IOHIDDeviceRef)device;
+#endif
+@end
 @interface GCExtendedGamepad (SDL)
 #if !((__IPHONE_OS_VERSION_MAX_ALLOWED >= 121000) || (__APPLETV_OS_VERSION_MAX_ALLOWED >= 121000) || (__MAC_OS_VERSION_MAX_ALLOWED >= 1401000))
 @property (nonatomic, readonly, nullable) GCControllerButtonInput *leftThumbstickButton;