Compatibility mode for GCC 4.6.

4.6 doesn't support `override` keyword, using preprocessor macro to
simply hide it. The compatibility mode must be explicitly enabled,
though, using GCC46_COMPATIBILITY CMake option.

CMakeLists.txt

@@ -4,6 +4,8 @@ project(Magnum)
 
 include(CMakeDependentOption)
 
+option(GCC46_COMPATIBILITY "Enable compatibility mode for GCC 4.6 (might disable some features)" OFF)
+
 option(TARGET_GLES "Build for OpenGL ES instead of desktop OpenGL" OFF)
 cmake_dependent_option(TARGET_GLES2 "Build for OpenGL ES 2" ON "TARGET_GLES" OFF)
 

src/CMakeLists.txt

@@ -11,6 +11,11 @@ endif()
 if(TARGET_GLES2)
     set(MAGNUM_TARGET_GLES2 1)
 endif()
+
+if(GCC46_COMPATIBILITY)
+    set(MAGNUM_GCC46_COMPATIBILITY 1)
+endif()
+
 configure_file(${CMAKE_CURRENT_SOURCE_DIR}/magnumConfigure.h.cmake
                ${CMAKE_CURRENT_BINARY_DIR}/magnumConfigure.h)
 
@@ -73,6 +78,7 @@ set(Magnum_HEADERS
     Timeline.h
     TypeTraits.h
 
+    magnumCompatibility.h
     magnumVisibility.h)
 add_library(MagnumObjects OBJECT ${Magnum_SRCS})
 

src/magnumCompatibility.h

@@ -0,0 +1,24 @@
+#ifndef magnumCompatibility_h
+#define magnumCompatibility_h
+/*
+    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>
+
+    This file is part of Magnum.
+
+    Magnum is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License version 3
+    only, as published by the Free Software Foundation.
+
+    Magnum is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License version 3 for more details.
+*/
+
+#include "magnumConfigure.h"
+
+#ifdef MAGNUM_GCC46_COMPATIBILITY
+#define override
+#endif
+
+#endif

src/magnumConfigure.h.cmake

@@ -1,2 +1,3 @@
 #cmakedefine MAGNUM_TARGET_GLES
 #cmakedefine MAGNUM_TARGET_GLES2
+#cmakedefine MAGNUM_GCC46_COMPATIBILITY