QtAutogen: Reconfigure when .qrc file changes

Add .qrc files to the CMake depends.
When the .qrc file changes the build system gets reconfigured
and the resource files watch list gets updated.

Source/cmQtAutoGeneratorInitializer.cxx

@@ -109,7 +109,7 @@ static void SetupSourceFiles(cmGeneratorTarget const* target,
   std::vector<cmSourceFile*> srcFiles;
   target->GetConfigCommonSourceFiles(srcFiles);
 
-  std::vector<std::string> newRccFiles;
+  std::vector<std::string> rccOutput;
 
   cmFilePathChecksum fpathCheckSum(makefile);
   for (std::vector<cmSourceFile*>::const_iterator fileIt = srcFiles.begin();
@@ -127,19 +127,16 @@ static void SetupSourceFiles(cmGeneratorTarget const* target,
       if (ext == "qrc" &&
           !cmSystemTools::IsOn(sf->GetPropertyForUser("SKIP_AUTORCC"))) {
 
+        // Run cmake again when .qrc file changes
+        makefile->AddCMakeDependFile ( absFile );
+
         std::string rccOutputFile = GetAutogenTargetBuildDir(target);
         rccOutputFile += fpathCheckSum.getPart(absFile);
         rccOutputFile += "/qrc_";
         rccOutputFile +=
           cmsys::SystemTools::GetFilenameWithoutLastExtension(absFile);
         rccOutputFile += ".cpp";
-
-        makefile->GetOrCreateSource(rccOutputFile, true);
-        newRccFiles.push_back(rccOutputFile);
-
-        // Create output directory
-        cmSystemTools::MakeDirectory(
-          cmsys::SystemTools::GetFilenamePath(rccOutputFile));
+        rccOutput.push_back(rccOutputFile);
       }
     }
 
@@ -158,9 +155,16 @@ static void SetupSourceFiles(cmGeneratorTarget const* target,
     }
   }
 
-  for (std::vector<std::string>::const_iterator fileIt = newRccFiles.begin();
-       fileIt != newRccFiles.end(); ++fileIt) {
-    const_cast<cmGeneratorTarget*>(target)->AddSource(*fileIt);
+  // Add rcc output files as sources
+  for (std::vector<std::string>::const_iterator fileIt = rccOutput.begin();
+       fileIt != rccOutput.end(); ++fileIt) {
+    const std::string& rccOutputFile = *fileIt;
+    // Add source
+    makefile->GetOrCreateSource(rccOutputFile, true);
+    const_cast<cmGeneratorTarget*>(target)->AddSource(rccOutputFile);
+    // Create output directory
+    cmSystemTools::MakeDirectory(
+      cmsys::SystemTools::GetFilenamePath(rccOutputFile));
   }
 }