ENH: Improve context for errors in macros

We now properly report the source location of command arguments inside
macros instead of using the macro invocation site.  No information is
lost because full call-stack information is already reported.

Source/cmMacroCommand.cxx

@@ -129,13 +129,6 @@ bool cmMacroHelperCommand::InvokeInitialPass
     newLFF.Name = this->Functions[c].Name;
     newLFF.FilePath = this->Functions[c].FilePath;
     newLFF.Line = this->Functions[c].Line;
-    const char* def = this->Makefile->GetDefinition
-      ("CMAKE_MACRO_REPORT_DEFINITION_LOCATION"); 
-    bool macroReportLocation = false;
-    if(def && !cmSystemTools::IsOff(def))
-      {
-      macroReportLocation = true;
-      }
 
     // for each argument of the current function
     for (std::vector<cmListFileArgument>::const_iterator k = 
@@ -212,28 +205,8 @@ bool cmMacroHelperCommand::InvokeInitialPass
 
       arg.Value = tmps;
       arg.Quoted = k->Quoted;
-      if(macroReportLocation)
-        {
-        // Report the location of the argument where the macro was
-        // defined.
-        arg.FilePath = k->FilePath;
-        arg.Line = k->Line;
-        }
-      else
-        {
-        // Report the location of the argument where the macro was
-        // invoked.
-        if (args.size())
-          {
-          arg.FilePath = args[0].FilePath;
-          arg.Line = args[0].Line;
-          }
-        else
-          {
-          arg.FilePath = "Unknown";
-          arg.Line = 0;
-          }
-        }
+      arg.FilePath = k->FilePath;
+      arg.Line = k->Line;
       newLFF.Arguments.push_back(arg);
       }
     cmExecutionStatus status;