CMake/Source/cmVariableRequiresCommand.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
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#include "cmVariableRequiresCommand.h"
#include "cmCacheManager.h"
// cmLibraryCommand
bool cmVariableRequiresCommand
::InitialPass(std::vector<std::string>const& args, cmExecutionStatus &)
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{
if(this->Disallowed(cmPolicies::CMP0035,
"The variable_requires command should not be called; see CMP0035."))
{ return true; }
if(args.size() < 3 )
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{
this->SetError("called with incorrect number of arguments");
return false;
}
std::string testVariable = args[0];
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if(!this->Makefile->IsOn(testVariable.c_str()))
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{
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return true;
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}
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std::string resultVariable = args[1];
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bool requirementsMet = true;
std::string notSet;
bool hasAdvanced = false;
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for(unsigned int i = 2; i < args.size(); ++i)
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{
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if(!this->Makefile->IsOn(args[i].c_str()))
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{
requirementsMet = false;
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notSet += args[i];
notSet += "\n";
cmCacheManager::CacheIterator it =
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this->Makefile->GetCacheManager()->GetCacheIterator(args[i].c_str());
if(!it.IsAtEnd() && it.GetPropertyAsBool("ADVANCED"))
{
hasAdvanced = true;
}
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}
}
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const char* reqVar = this->Makefile->GetDefinition(resultVariable.c_str());
// if reqVar is unset, then set it to requirementsMet
// if reqVar is set to true, but requirementsMet is false , then
// set reqVar to false.
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if(!reqVar || (!requirementsMet && this->Makefile->IsOn(reqVar)))
{
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this->Makefile->AddDefinition(resultVariable.c_str(), requirementsMet);
}
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if(!requirementsMet)
{
std::string message = "Variable assertion failed:\n";
message += testVariable +
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" Requires that the following unset variables are set:\n";
message += notSet;
message += "\nPlease set them, or set ";
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message += testVariable + " to false, and re-configure.\n";
if(hasAdvanced)
{
message +=
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"One or more of the required variables is advanced."
" To set the variable, you must turn on advanced mode in cmake.";
}
cmSystemTools::Error(message.c_str());
}
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return true;
}