Require at least CMake 2.6.3 to build current CMake

Remove some cruft left for supporting builds with CMake 2.4.

CMakeLists.txt

@@ -1,6 +1,6 @@
 #=============================================================================
 # CMake - Cross Platform Makefile Generator
-# Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+# Copyright 2000-2011 Kitware, Inc., Insight Software Consortium
 #
 # Distributed under the OSI-approved BSD License (the "License");
 # see accompanying file Copyright.txt for details.
@@ -9,12 +9,9 @@
 # implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 # See the License for more information.
 #=============================================================================
-CMAKE_MINIMUM_REQUIRED(VERSION 2.4.5 FATAL_ERROR)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.3 FATAL_ERROR)
 SET(CMAKE_LEGACY_CYGWIN_WIN32 0) # Remove when CMake >= 2.8.4 is required
 PROJECT(CMake)
-IF(COMMAND CMAKE_POLICY)
-  CMAKE_POLICY(SET CMP0003 NEW)
-ENDIF(COMMAND CMAKE_POLICY)
 
 IF(CMAKE_BOOTSTRAP)
   # Running from bootstrap script.  Set local variable and remove from cache.
@@ -24,18 +21,8 @@ ENDIF()
 
 MARK_AS_ADVANCED(CMAKE_BACKWARDS_COMPATIBILITY)
 
-# Allow empty endif() and such with CMake 2.4.
-SET(CMAKE_ALLOW_LOOSE_LOOP_CONSTRUCTS 1)
-
 SET(CMake_BIN_DIR ${CMake_BINARY_DIR}/bin)
 
-IF(NOT ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION} GREATER 2.4)
-  # Since the built CMake will install itself instead of the
-  # generating CMake, tell it that the install rules were generated
-  # by CMake 2.4.
-  INSTALL(CODE "SET(CMAKE_INSTALL_SELF_2_4 1)")
-ENDIF()
-
 IF("${CMake_SOURCE_DIR}" STREQUAL "${CMAKE_SOURCE_DIR}")
   # Disallow architecture-specific try_run.  It may not run on the host.
   MACRO(TRY_RUN)

Source/cmFileCommand.cxx

@@ -1707,7 +1707,7 @@ protected:
   {
     DoingType = DoingLast1,
     DoingRename,
-    DoingSelf24
+    DoingLast2
   };
   virtual bool CheckKeyword(std::string const& arg);
   virtual bool CheckValue(std::string const& arg);
@@ -1846,22 +1846,12 @@ bool cmFileInstaller::CheckKeyword(std::string const& arg)
   else if(arg == "COMPONENTS" || arg == "CONFIGURATIONS" ||
           arg == "PROPERTIES")
     {
-    if(this->Makefile->IsOn("CMAKE_INSTALL_SELF_2_4"))
-      {
-      // When CMake 2.4 builds this CMake version we need to support
-      // the install scripts it generates since it asks this CMake
-      // to install itself using the rules it generated.
-      this->Doing = DoingSelf24;
-      }
-    else
-      {
-      cmOStringStream e;
-      e << "INSTALL called with old-style " << arg << " argument.  "
-        << "This script was generated with an older version of CMake.  "
-        << "Re-run this cmake version on your build tree.";
-      this->FileCommand->SetError(e.str().c_str());
-      this->Doing = DoingError;
-      }
+    cmOStringStream e;
+    e << "INSTALL called with old-style " << arg << " argument.  "
+      << "This script was generated with an older version of CMake.  "
+      << "Re-run this cmake version on your build tree.";
+    this->FileCommand->SetError(e.str().c_str());
+    this->Doing = DoingError;
     }
   else
     {
@@ -1884,12 +1874,6 @@ bool cmFileInstaller::CheckValue(std::string const& arg)
     case DoingRename:
       this->Rename = arg;
       break;
-    case DoingSelf24:
-      // Ignore these arguments for compatibility.  This should be
-      // reached only when CMake 2.4 is installing the current
-      // CMake.  It can be removed when CMake 2.6 or higher is
-      // required to build CMake.
-      break;
     default:
       return this->cmFileCopier::CheckValue(arg);
     }

Utilities/cmcurl/CMakeLists.txt

@@ -1,10 +1,4 @@
-CMAKE_MINIMUM_REQUIRED(VERSION 2.4)
-IF(COMMAND CMAKE_POLICY)
-  CMAKE_POLICY(SET CMP0003 NEW)
-ENDIF(COMMAND CMAKE_POLICY)
-IF(CMAKE_OSX_ARCHITECTURES)
-  CMAKE_MINIMUM_REQUIRED(VERSION 2.6.3 FATAL_ERROR)
-ENDIF(CMAKE_OSX_ARCHITECTURES)
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.3 FATAL_ERROR)
 PROJECT(LIBCURL C)
 
 # Setup package meta-data

Utilities/cmlibarchive/CMakeLists.txt

@@ -1,8 +1,8 @@
+CMAKE_MINIMUM_REQUIRED(VERSION 2.6.3 FATAL_ERROR)
 #
 #
 PROJECT(libarchive C)
 #
-CMAKE_MINIMUM_REQUIRED(VERSION 2.6.1)
 SET(CMAKE_MODULE_PATH "${libarchive_SOURCE_DIR}/build/cmake")
 
 # We use CHECK_TYPE_SIZE for existence tests, so use only one arch.