cmTarget: Add Compute API for sources.

This method is a refactoring artifact.  It will be removed in a
follow-up.

Source/cmGlobalGenerator.cxx

@@ -1538,6 +1538,7 @@ void cmGlobalGenerator::CreateGeneratorTargets(TargetTypes targetTypes,
         ti != targets.end(); ++ti)
       {
       cmTarget* t = &ti->second;
+      t->Compute();
       cmGeneratorTarget* gt = new cmGeneratorTarget(t, lg);
       this->GeneratorTargets[t] = gt;
       generatorTargets[t] = gt;

Source/cmGlobalVisualStudio8Generator.cxx

@@ -254,6 +254,7 @@ bool cmGlobalVisualStudio8Generator::AddCheckTarget()
     mf->AddUtilityCommand(CMAKE_CHECK_BUILD_SYSTEM_TARGET, false,
                           no_working_directory, no_depends,
                           noCommandLines);
+  tgt->Compute();
 
   cmGeneratorTarget* gt = new cmGeneratorTarget(tgt, lg);
   mf->AddGeneratorTarget(tgt, gt);

Source/cmGlobalVisualStudioGenerator.cxx

@@ -86,6 +86,7 @@ void cmGlobalVisualStudioGenerator::AddExtraIDETargets()
                           no_depends, no_commands, false,
                           "Build all projects");
 
+      allBuild->Compute();
       cmGeneratorTarget* gt = new cmGeneratorTarget(allBuild, gen[0]);
       allBuild->GetMakefile()->AddGeneratorTarget(allBuild, gt);
 

Source/cmGlobalXCodeGenerator.cxx

@@ -456,6 +456,7 @@ cmGlobalXCodeGenerator::AddExtraTargets(cmLocalGenerator* root,
                         no_working_directory,
                         "echo", "Build all projects");
 
+  allbuild->Compute();
   cmGeneratorTarget* allBuildGt = new cmGeneratorTarget(allbuild, root);
   mf->AddGeneratorTarget(allbuild, allBuildGt);
 
@@ -491,6 +492,7 @@ cmGlobalXCodeGenerator::AddExtraTargets(cmLocalGenerator* root,
                           no_working_directory,
                           "make", "-f", file.c_str());
 
+    check->Compute();
     cmGeneratorTarget* checkGt = new cmGeneratorTarget(check, root);
     mf->AddGeneratorTarget(check, checkGt);
     }

Source/cmQtAutoGeneratorInitializer.cxx

@@ -885,6 +885,8 @@ void cmQtAutoGeneratorInitializer::InitializeAutogenTarget(
                                 /*byproducts=*/rcc_output, depends,
                                 commandLines, false, autogenComment.c_str());
 
+    autogenTarget->Compute();
+
     cmGeneratorTarget* gt = new cmGeneratorTarget(autogenTarget, lg);
     makefile->AddGeneratorTarget(autogenTarget, gt);
 

Source/cmTarget.cxx

@@ -397,6 +397,10 @@ void CreatePropertyGeneratorExpressions(
     }
 }
 
+void cmTarget::Compute()
+{
+}
+
 //----------------------------------------------------------------------------
 void cmTarget::AddUtility(const std::string& u, cmMakefile *makefile)
 {

Source/cmTarget.h

@@ -133,6 +133,8 @@ public:
   void AddPostBuildCommand(cmCustomCommand const &cmd)
     {this->PostBuildCommands.push_back(cmd);}
 
+  void Compute();
+
   /**
    * Get the list of the source files used by this target
    */