cmTarget: Allow transitive evaluation of SOURCES property.

Extend the cmGeneratorExpressionDAGChecker with an interface
returning the name of the top target.  Use that to determine
when there is a DAG violation, as required by the RunCMake.Languages
tests.

1 files changed, 4 insertions, 1 deletions

diff --git a/Source/cmGeneratorExpressionDAGChecker.h b/Source/cmGeneratorExpressionDAGChecker.h
index 6cbbd2a..b3147f7 100644
--- a/Source/cmGeneratorExpressionDAGChecker.h
+++ b/Source/cmGeneratorExpressionDAGChecker.h
@@ -25,7 +25,8 @@
   SELECT(F, EvaluatingSystemIncludeDirectories, SYSTEM_INCLUDE_DIRECTORIES) \
   SELECT(F, EvaluatingCompileDefinitions,       COMPILE_DEFINITIONS) \
   SELECT(F, EvaluatingCompileOptions,           COMPILE_OPTIONS) \
-  SELECT(F, EvaluatingAutoUicOptions,           AUTOUIC_OPTIONS)
+  SELECT(F, EvaluatingAutoUicOptions,           AUTOUIC_OPTIONS) \
+  SELECT(F, EvaluatingSources,                  SOURCES)
 
 #define CM_FOR_EACH_TRANSITIVE_PROPERTY(F) \
   CM_FOR_EACH_TRANSITIVE_PROPERTY_IMPL(F, CM_SELECT_BOTH)
@@ -70,6 +71,8 @@ struct cmGeneratorExpressionDAGChecker
   void SetTransitivePropertiesOnly()
     { this->TransitivePropertiesOnly = true; }
 
+  std::string TopTarget() const;
+
 private:
   Result CheckGraph() const;