Source/cmVariableRequiresCommand.cxx

   1 /*=========================================================================
   2
   3   Program:   CMake - Cross-Platform Makefile Generator
   4   Module:    $RCSfile: cmVariableRequiresCommand.cxx,v $
   5   Language:  C++
   6   Date:      $Date: 2008-01-23 15:27:59 $
   7   Version:   $Revision: 1.15 $
   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 "cmVariableRequiresCommand.h"
  18 #include "cmCacheManager.h"
  19
  20 // cmLibraryCommand
  21 bool cmVariableRequiresCommand
  22 ::InitialPass(std::vector<std::string>const& args, cmExecutionStatus &)
  23 {
  24   if(args.size() < 3 )
  25     {
  26     this->SetError("called with incorrect number of arguments");
  27     return false;
  28     }
  29
  30   std::string testVariable = args[0];
  31   if(!this->Makefile->IsOn(testVariable.c_str()))
  32     {
  33     return true;
  34     }
  35   std::string resultVariable = args[1];
  36   bool requirementsMet = true;
  37   std::string notSet;
  38   bool hasAdvanced = false;
  39   for(unsigned int i = 2; i < args.size(); ++i)
  40     {
  41     if(!this->Makefile->IsOn(args[i].c_str()))
  42       {
  43       requirementsMet = false;
  44       notSet += args[i];
  45       notSet += "\n";
  46       cmCacheManager::CacheIterator it =
  47         this->Makefile->GetCacheManager()->GetCacheIterator(args[i].c_str());
  48       if(!it.IsAtEnd() && it.GetPropertyAsBool("ADVANCED"))
  49         {
  50         hasAdvanced = true;
  51         }
  52       }
  53     }
  54   const char* reqVar = this->Makefile->GetDefinition(resultVariable.c_str());
  55   // if reqVar is unset, then set it to requirementsMet
  56   // if reqVar is set to true, but requirementsMet is false , then
  57   // set reqVar to false.
  58   if(!reqVar || (!requirementsMet && this->Makefile->IsOn(reqVar)))
  59     {
  60     this->Makefile->AddDefinition(resultVariable.c_str(), requirementsMet);
  61     }
  62
  63   if(!requirementsMet)
  64     {
  65     std::string message = "Variable assertion failed:\n";
  66     message += testVariable +
  67       " Requires that the following unset variables are set:\n";
  68     message += notSet;
  69     message += "\nPlease set them, or set ";
  70     message += testVariable + " to false, and re-configure.\n";
  71     if(hasAdvanced)
  72       {
  73       message +=
  74         "One or more of the required variables is advanced."
  75         "  To set the variable, you must turn on advanced mode in cmake.";
  76       }
  77     cmSystemTools::Error(message.c_str());
  78     }
  79
  80   return true;
  81 }