Test for ObjC++ on OSX machines only

Tests/ObjC++/CMakeLists.txt

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+# a simple objc++ test case that uses Cocoa framework
+PROJECT (objc++)
+
+ADD_EXECUTABLE (objc++ objc++.mm)
+

Tests/ObjC++/objc++.mm

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+#import <iostream.h>
+#import <Cocoa/Cocoa.h>
+
+int main()
+{
+  NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
+   
+  NSMutableSet *mySet = [NSMutableSet set];
+  cout<<"Adding values to the set."<<endl;
+  [mySet addObject:[NSNumber numberWithInt:356]];
+  [mySet addObject:[NSNumber numberWithInt:550]];
+  [mySet addObject:[NSNumber numberWithInt:914]];
+
+  cout<<"The set contains "<<[mySet count]<<" objects."<<endl;
+  if ([mySet containsObject:[NSNumber numberWithInt:911]])
+    cout<<"It's there!"<<endl;
+  else
+    cout<<"It's not there."<<endl;
+
+  [pool release];
+  return 0;
+}