Documentation update

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                         <td>-E</td>
                         <td>Instructs the compiler to only preprocess the input, writing the preprocessed output to stdout</td>
                     </tr>
+                    <tr>
+                        <td>-D</td>
+                        <td>
+                            &quot;define&quot; a macro. Optionally you may supply
+                            a value to the macro with &quot;=&quot;. Implicitally turns on -fftepp
+                        </td>
+                    </tr>
                     <tr>
                         <td>-Wall</td>
                         <td>Enables all compiled warnings for the selcted standard</td>