re PR sanitizer/64706 (-fsanitize=vptr is not documented)

	PR sanitizer/64706
	* doc/invoke.texi (-fsanitize=vptr): Document.

From-SVN: r219971

gcc/ChangeLog

 2015-01-21  Jakub Jelinek  <jakub@redhat.com>
 
+	PR sanitizer/64706
+	* doc/invoke.texi (-fsanitize=vptr): Document.
+
 	PR rtl-optimization/62078
 	* dse.c: Include cfgcleanup.h.
 	(rest_of_handle_dse): For -fnon-call-exceptions, if DSE removed

gcc/doc/invoke.texi

@@ -5761,6 +5761,13 @@ This option enables instrumentation of loads from an enum type.  If
 a value outside the range of values for the enum type is loaded,
 a run-time error is issued.
 
+@item -fsanitize=vptr
+@opindex fsanitize=vptr
+
+This option enables instrumentation of C++ member function calls, member
+accesses and some conversions between pointers to base and derived classes,
+to verify the referenced object has the correct dynamic type.
+
 @end table
 
 While @option{-ftrapv} causes traps for signed overflows to be emitted,