1 files changed, 4 insertions, 1 deletions
diff --git a/Source/cmGeneratorExpressionEvaluator.h b/Source/cmGeneratorExpressionEvaluator.h
index d904b02..fb6c7ee 100644
--- a/Source/cmGeneratorExpressionEvaluator.h
+++ b/Source/cmGeneratorExpressionEvaluator.h
@@ -24,9 +24,12 @@ struct cmGeneratorExpressionContext
 {
   cmListFileBacktrace Backtrace;
   std::set<cmTarget*> Targets;
+  std::set<cmStdString> SeenTargetProperties;
   cmMakefile *Makefile;
   const char *Config;
-  cmTarget *Target;
+  cmTarget *HeadTarget; // The target whose property is being evaluated.
+  cmTarget *CurrentTarget; // The dependent of HeadTarget which appears
+                           // directly or indirectly in the property.
   bool Quiet;
   bool HadError;
 };