Disable CGAL_Core if void* is size 8 (ie 64 bits).

Installation/CHANGES

@@ -4,6 +4,10 @@ Release notes of CGAL.
 
 CGAL 3.7 offers the following improvements and new functionality : 
 
+x General 
+
+  - The configuration of CGAL libraries now requires CMake>=2.6.
+
 x Triangulations and Delaunay Triangulations
 
 x.y 2D Triangulations

Installation/CMakeLists.txt

@@ -5,7 +5,7 @@
 # ${CMAKE_BINARY_DIR} or ${CMAKE_BINARY_DIR}.
 project(CGAL)
 
-CMAKE_MINIMUM_REQUIRED(VERSION 2.4.5 FATAL_ERROR)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.0 FATAL_ERROR)
 
 # This allows else(), endif(), etc... (without repeating the expression)
 set(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS true)
@@ -273,6 +273,17 @@ add_config_flag( CGAL_USE_MPFR )
 add_config_flag( CGAL_USE_GMPXX )
 add_config_flag( CGAL_USE_LEDA )
 
+# Disable CORE if the architecture is 64 bits.
+if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+  message(STATUS "Detected 64bit architecture, disable CGAL_Core")
+  set(CGAL_USE_CORE 0)
+  set(CGAL_NO_CORE ON)
+else()
+  set(CGAL_USE_CORE ${CGAL_USE_GMP})
+endif()
+
+add_config_flag( CGAL_USE_CORE )
+
 if ( RUNNING_CGAL_AUTO_TEST AND MSVC )
   file( APPEND "${CMAKE_BINARY_DIR}/include/CGAL/compiler_config.h" "#include <CGAL/Testsuite/vc_debug_hook.h>\n\n" )
 endif()

Installation/include/CGAL/config.h

@@ -188,13 +188,6 @@ using std::min;
 using std::max;
 #endif
 
-//-------------------------------------------------------------------//
-// Is CORE usable ?
-#ifdef CGAL_USE_GMP
-#  define CGAL_USE_CORE CGAL_USE_GMP
-#endif
-
-
 //-------------------------------------------------------------------//
 // Is Geomview usable ?
 #if !defined(_MSC_VER) && !defined(__MINGW32__)