Add option for running with gdb

buildconfig/CMake/Packaging/launch_mantidplot.sh.in

@@ -22,10 +22,10 @@ fi
 
 if [ -n "${NXSESSIONID}" ]; then
   command -v vglrun >/dev/null 2>&1 || { echo >&2 "MantidPlot requires VirtualGL but it's not installed.  Aborting."; exit 1; }
-  VGLRUN="vglrun "
+  VGLRUN="vglrun"
 elif [ -n "${TLSESSIONDATA}" ]; then
   command -v vglrun >/dev/null 2>&1 || { echo >&2 "MantidPlot requires VirtualGL but it's not installed.  Aborting."; exit 1; }
-  VGLRUN="vglrun "
+  VGLRUN="vglrun"
 fi
 
 # Define when to report large memory allocation
@@ -42,8 +42,15 @@ else
     TCM_REPORT=${TCMALLOC_LARGE_ALLOC_REPORT_THRESHOLD}
 fi
 
+# run with gdb THIS OPTION MUST BE SUPPLIED FIRST
+if [ -n "$1" ] && [ "$1" = "--debug" ]; then
+    shift
+    GDB="gdb --args"
+fi
+
+
 # Launch
 LD_PRELOAD=${LOCAL_PRELOAD} TCMALLOC_RELEASE_RATE=${TCM_RELEASE} \
     TCMALLOC_LARGE_ALLOC_REPORT_THRESHOLD=${TCM_REPORT} \
     LD_LIBRARY_PATH=${LOCAL_LDPATH} QT_API=pyqt \
-    @WRAPPER_PREFIX@$VGLRUN$INSTALLDIR/@MANTIDPLOT_EXEC@ $*@WRAPPER_POSTFIX@
+    @WRAPPER_PREFIX@$VGLRUN $GDB $INSTALLDIR/@MANTIDPLOT_EXEC@ $*@WRAPPER_POSTFIX@