Keep track of all targets seen while evaluating a genex.

As dependencies of the generator expression, these will re-exported
in try_compile generated code.

Source/cmGeneratorExpression.cxx

@@ -114,7 +114,8 @@ const char *cmCompiledGeneratorExpression::Evaluate(
     this->HadContextSensitiveCondition = context.HadContextSensitiveCondition;
     }
 
-  this->Targets = context.Targets;
+  this->DependTargets = context.DependTargets;
+  this->AllTargetsSeen = context.AllTargets;
   // TODO: Return a std::string from here instead?
   return this->Output.c_str();
 }

Source/cmGeneratorExpression.h

@@ -88,11 +88,14 @@ public:
 
   /** Get set of targets found during evaluations.  */
   std::set<cmTarget*> const& GetTargets() const
-    { return this->Targets; }
+    { return this->DependTargets; }
 
   std::set<cmStdString> const& GetSeenTargetProperties() const
     { return this->SeenTargetProperties; }
 
+  std::set<cmTarget*> const& GetAllTargetsSeen() const
+    { return this->AllTargetsSeen; }
+
   ~cmCompiledGeneratorExpression();
 
   std::string GetInput() const
@@ -123,7 +126,8 @@ private:
   const std::string Input;
   bool NeedsParsing;
 
-  mutable std::set<cmTarget*> Targets;
+  mutable std::set<cmTarget*> DependTargets;
+  mutable std::set<cmTarget*> AllTargetsSeen;
   mutable std::set<cmStdString> SeenTargetProperties;
   mutable std::string Output;
   mutable bool HadContextSensitiveCondition;

Source/cmGeneratorExpressionEvaluator.cxx

@@ -392,6 +392,7 @@ static const struct TargetPropertyNode : public cmGeneratorExpressionNode
         reportError(context, content->GetOriginalExpression(), e.str());
         return std::string();
         }
+        context->AllTargets.insert(target);
       }
 
     if (target == context->HeadTarget)
@@ -852,7 +853,8 @@ struct TargetFilesystemArtifact : public cmGeneratorExpressionNode
                   "Target \"" + name + "\" is not an executable or library.");
       return std::string();
       }
-    context->Targets.insert(target);
+    context->DependTargets.insert(target);
+    context->AllTargets.insert(target);
 
     std::string result =
                 TargetFilesystemArtifactResultCreator<linker, soname>::Create(

Source/cmGeneratorExpressionEvaluator.h

@@ -23,7 +23,8 @@ class cmTarget;
 struct cmGeneratorExpressionContext
 {
   cmListFileBacktrace Backtrace;
-  std::set<cmTarget*> Targets;
+  std::set<cmTarget*> DependTargets;
+  std::set<cmTarget*> AllTargets;
   std::set<cmStdString> SeenTargetProperties;
   cmMakefile *Makefile;
   const char *Config;