[vtk-developers] Use of autorelease in Cocoa classes

[David Gobbi]

Here's a very simple diff that re-adds the flag, it should be enough to
test whether it has the desired effect on gc.

 - David

diff --git a/Rendering/OpenGL/CMakeLists.txt b/Rendering/OpenGL/CMakeLists.txt
index 5e59f56..7e06178 100644
--- a/Rendering/OpenGL/CMakeLists.txt
+++ b/Rendering/OpenGL/CMakeLists.txt
@@ -340,6 +340,12 @@ elseif(VTK_USE_COCOA)
   list(APPEND ${vtk-module}_HDRS
     vtkCocoaMacOSXSDKCompatibility.h
     )
+  set_source_files_properties(
+    vtkCocoaRenderWindowInteractor.mm
+    vtkCocoaRenderWindow.mm
+    vtkCocoaGLView.mm
+    PROPERTIES COMPILE_FLAGS "-fobjc-gc"
+    )
   set_source_files_properties(vtkCocoaGLView WRAP_EXCLUDE)
 elseif(VTK_USE_CARBON)
   # Add some custom overrides