Avoid directly calling objc runtime functions in C

By managing autorelease pools in objc code we avoid warnings on OS X
10.9 and it is also safer than calling objc runtime functions from C.

src/MacVim/gui_macvim.m

@@ -1806,6 +1806,15 @@ void gui_macvim_get_window_layout(int *count, int *layout)
     }
 }
 
+void *gui_macvim_new_autoreleasepool()
+{
+    return (void *)[[NSAutoreleasePool alloc] init];
+}
+
+void gui_macvim_release_autoreleasepool(void *pool)
+{
+    [(id)pool release];
+}
 
 // -- Client/Server ---------------------------------------------------------
 

src/main.c

@@ -23,10 +23,6 @@
 # include <limits.h>
 #endif
 
-#ifdef FEAT_GUI_MACVIM
-#include <objc/objc-runtime.h>  /* for objc_*() and sel_*() */
-#endif
-
 /* Maximum number of commands from + or -c arguments. */
 #define MAX_ARG_CMDS 10
 
@@ -180,9 +176,7 @@ main
     // Cocoa needs an NSAutoreleasePool in place or it will leak memory.
     // This particular pool will hold autorelease objects created during
     // initialization.
-    id autoreleasePool = objc_msgSend(objc_msgSend(
-            objc_getClass("NSAutoreleasePool"),sel_getUid("alloc")
-            ), sel_getUid("init"));
+    void *autoreleasePool = gui_macvim_new_autoreleasepool();
 #endif
 
     /*
@@ -1066,13 +1060,11 @@ vim_main2(int argc UNUSED, char **argv UNUSED)
 #ifdef FEAT_GUI_MACVIM
     // The autorelease pool might have filled up quite a bit during
     // initialization, so purge it before entering the main loop.
-    objc_msgSend(autoreleasePool, sel_getUid("release"));
+    gui_macvim_release_autoreleasepool(autoreleasePool);
 
     // The main loop sets up its own autorelease pool, but to be safe we still
     // realloc this one here.
-    autoreleasePool = objc_msgSend(objc_msgSend(
-            objc_getClass("NSAutoreleasePool"),sel_getUid("alloc")
-            ), sel_getUid("init"));
+    autoreleasePool = gui_macvim_new_autoreleasepool();
 #endif
 
     /*
@@ -1081,7 +1073,7 @@ vim_main2(int argc UNUSED, char **argv UNUSED)
     main_loop(FALSE, FALSE);
 
 #ifdef FEAT_GUI_MACVIM
-    objc_msgSend(autoreleasePool, sel_getUid("release"));
+    gui_macvim_release_autoreleasepool(autoreleasePool);
 #endif
 
     return 0;
@@ -1152,9 +1144,7 @@ main_loop(cmdwin, noexmode)
 #ifdef FEAT_GUI_MACVIM
         // Cocoa needs an NSAutoreleasePool in place or it will leak memory.
         // This particular pool gets released once every loop.
-        id autoreleasePool = objc_msgSend(objc_msgSend(
-                objc_getClass("NSAutoreleasePool"),sel_getUid("alloc")
-                ), sel_getUid("init"));
+        void *autoreleasePool = gui_macvim_new_autoreleasepool();
 #endif
 
 	if (stuff_empty())
@@ -1404,7 +1394,7 @@ main_loop(cmdwin, noexmode)
 #ifdef FEAT_GUI_MACVIM
         // TODO! Make sure there are no continue statements that will cause
         // this not to be called or MacVim will leak memory!
-        objc_msgSend(autoreleasePool, sel_getUid("release"));
+        gui_macvim_release_autoreleasepool(autoreleasePool);
 #endif
     }
 }

src/proto/gui_macvim.pro

@@ -236,3 +236,6 @@ gui_mch_register_sign(char_u *signfile);
 
     void
 gui_mch_destroy_sign(void *sign);
+
+void *gui_macvim_new_autoreleasepool();
+void gui_macvim_release_autoreleasepool(void *pool);