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diff --git a/Source/cmGeneratorExpressionDAGChecker.cxx b/Source/cmGeneratorExpressionDAGChecker.cxx
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+/*============================================================================
+ CMake - Cross Platform Makefile Generator
+ Copyright 2012 Stephen Kelly <steveire@gmail.com>
+
+ Distributed under the OSI-approved BSD License (the "License");
+ see accompanying file Copyright.txt for details.
+
+ 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.
+============================================================================*/
+
+#include "cmGeneratorExpressionDAGChecker.h"
+
+#include "cmMakefile.h"
+
+//----------------------------------------------------------------------------
+cmGeneratorExpressionDAGChecker::cmGeneratorExpressionDAGChecker(
+ const cmListFileBacktrace &backtrace,
+ const std::string &target,
+ const std::string &property,
+ const GeneratorExpressionContent *content,
+ cmGeneratorExpressionDAGChecker *parent)
+ : Parent(parent), Target(target), Property(property),
+ Content(content), Backtrace(backtrace)
+{
+ this->IsDAG = this->isDAG();
+}
+
+//----------------------------------------------------------------------------
+bool cmGeneratorExpressionDAGChecker::check() const
+{
+ return this->IsDAG;
+}
+
+//----------------------------------------------------------------------------
+void cmGeneratorExpressionDAGChecker::reportError(
+ cmGeneratorExpressionContext *context,
+ const std::string &expr)
+{
+ if (this->IsDAG)
+ {
+ return;
+ }
+
+ context->HadError = true;
+ if (context->Quiet)
+ {
+ return;
+ }
+
+ const cmGeneratorExpressionDAGChecker *parent = this->Parent;
+
+ if (parent && !parent->Parent)
+ {
+ cmOStringStream e;
+ e << "Error evaluating generator expression:\n"
+ << " " << expr << "\n"
+ << "Self reference on target \""
+ << context->Target->GetName() << "\".\n";
+ context->Makefile->GetCMakeInstance()
+ ->IssueMessage(cmake::FATAL_ERROR, e.str().c_str(),
+ parent->Backtrace);
+ return;
+ }
+
+ {
+ cmOStringStream e;
+ e << "Error evaluating generator expression:\n"
+ << " " << expr << "\n"
+ << "Dependency loop found.";
+ context->Makefile->GetCMakeInstance()
+ ->IssueMessage(cmake::FATAL_ERROR, e.str().c_str(),
+ context->Backtrace);
+ }
+
+ int loopStep = 1;
+ while (parent)
+ {
+ cmOStringStream e;
+ e << "Loop step " << loopStep << "\n"
+ << " "
+ << (parent->Content ? parent->Content->GetOriginalExpression() : expr)
+ << "\n";
+ context->Makefile->GetCMakeInstance()
+ ->IssueMessage(cmake::FATAL_ERROR, e.str().c_str(),
+ parent->Backtrace);
+ parent = parent->Parent;
+ ++loopStep;
+ }
+}
+
+//----------------------------------------------------------------------------
+bool cmGeneratorExpressionDAGChecker::isDAG() const
+{
+ const cmGeneratorExpressionDAGChecker *parent = this->Parent;
+ while (parent)
+ {
+ if (this->Target == parent->Target && this->Property == parent->Property)
+ {
+ return false;
+ }
+ parent = parent->Parent;
+ }
+ return true;
+}