Source/cmCMakeMinimumRequired.cxx

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmCMakeMinimumRequired.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2008-03-24 14:56:26 $
   7   Version:   $Revision: 1.18 $
   8
   9   Copyright (c) 2002 Kitware, Inc., Insight Consortium.  All rights reserved.
  10   See Copyright.txt or http://www.cmake.org/HTML/Copyright.html for details.
  11
  12      This software is distributed WITHOUT ANY WARRANTY; without even
  13      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  14      PURPOSE.  See the above copyright notices for more information.
  15
  16 =========================================================================*/
  17 #include "cmCMakeMinimumRequired.h"
  18
  19 #include "cmVersion.h"
  20
  21 // cmCMakeMinimumRequired
  22 bool cmCMakeMinimumRequired
  23 ::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
  24 {
  25   // Process arguments.
  26   std::string version_string;
  27   bool doing_version = false;
  28   for(unsigned int i=0; i < args.size(); ++i)
  29     {
  30     if(args[i] == "VERSION")
  31       {
  32       doing_version = true;
  33       }
  34     else if(args[i] == "FATAL_ERROR")
  35       {
  36       if(doing_version)
  37         {
  38         this->SetError("called with no value for VERSION.");
  39         return false;
  40         }
  41       doing_version = false;
  42       }
  43     else if(doing_version)
  44       {
  45       doing_version = false;
  46       version_string = args[i];
  47       }
  48     else
  49       {
  50       cmOStringStream e;
  51       e << "called with unknown argument \"" << args[i].c_str() << "\".";
  52       this->SetError(e.str().c_str());
  53       return false;
  54       }
  55     }
  56   if(doing_version)
  57     {
  58     this->SetError("called with no value for VERSION.");
  59     return false;
  60     }
  61
  62   // Make sure there was a version to check.
  63   if(version_string.empty())
  64     {
  65     return true;
  66     }
  67
  68   // Save the required version string.
  69   this->Makefile->AddDefinition("CMAKE_MINIMUM_REQUIRED_VERSION",
  70                                 version_string.c_str());
  71
  72
  73   // Get the current version number.
  74   int current_major = cmVersion::GetMajorVersion();
  75   int current_minor = cmVersion::GetMinorVersion();
  76   int current_patch = cmVersion::GetPatchVersion();
  77
  78   // Parse the required version number.  If no patch-level is given
  79   // use zero.
  80   int required_major = 0;
  81   int required_minor = 0;
  82   int required_patch = 0;
  83   if(sscanf(version_string.c_str(), "%d.%d.%d",
  84             &required_major, &required_minor, &required_patch) < 2)
  85     {
  86     cmOStringStream e;
  87     e << "could not parse VERSION \"" << version_string.c_str() << "\".";
  88     this->SetError(e.str().c_str());
  89     return false;
  90     }
  91
  92   // Compare the version numbers.
  93   if(current_major < required_major ||
  94      current_major == required_major &&
  95      current_minor < required_minor ||
  96      current_major == required_major &&
  97      current_minor == required_minor &&
  98      current_patch < required_patch)
  99     {
 100     // The current version is too low.
 101     cmOStringStream e;
 102     e << "CMake " << version_string.c_str()
 103       << " or higher is required.  You are running version "
 104       << current_major << "." << current_minor << "." << current_patch;
 105     this->Makefile->IssueMessage(cmake::FATAL_ERROR, e.str());
 106     cmSystemTools::SetFatalErrorOccured();
 107     return true;
 108     }
 109
 110   if (required_major < 2 || required_major == 2 && required_minor < 4)
 111   {
 112     this->Makefile->SetPolicyVersion("2.4");
 113   }
 114   else
 115   {
 116     this->Makefile->SetPolicyVersion(version_string.c_str());
 117   }
 118
 119   return true;
 120 }
 121