Merge topic 'vtkWrapping-fix-depfile-writing'

839a6e6b vtkParse_MainMulti: also initialize dependency tracking
f9c71959 vtkParseDependencyTracking: write a trivial file without inputs

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: David Gobbi <david.gobbi@gmail.com>
Merge-request: !10661

Wrapping/Tools/vtkParseDependencyTracking.c

@@ -131,6 +131,10 @@ int vtkParse_DependencyTrackingWrite(const char* fname)
       ++input;
     }
   }
+  else
+  {
+    write_line(fout, DepTracker.Target, "");
+  }
 
   fclose(fout);
 

Wrapping/Tools/vtkParseMain.c

@@ -603,6 +603,12 @@ StringCache* vtkParse_MainMulti(int argc, char* argv[])
     exit(1);
   }
 
+  if (options.DepFileName && options.OutputFileName)
+  {
+    vtkParse_InitDependencyTracking(options.OutputFileName);
+    /* TODO: register response files read in `read_option_file` here. */
+  }
+
   /* the input file */
   options.InputFileName = options.Files[0];
   return strings;