add --enable-sanitize config option

Change-Id: Ie6888cc29b9815d3dc7aa6673599a0d6cb010e6b

configure.ac

@@ -70,6 +70,18 @@ AC_SUBST(found_sqlite3)
 
 dnl Checks for typedefs, structures and compiler characteristics
 
+AC_ARG_ENABLE(sanitize,
+	[AS_HELP_STRING(
+		[--enable-sanitize],
+		[Compile with address sanitizer enabled],
+	)],
+	[sanitize=$enableval], [sanitize="no"])
+if test x"$sanitize" = x"yes"
+then
+	CFLAGS="$CFLAGS -fsanitize=address -fsanitize=undefined"
+	CPPFLAGS="$CPPFLAGS -fsanitize=address -fsanitize=undefined"
+fi
+
 # The following test is taken from WebKit's webkit.m4
 saved_CFLAGS="$CFLAGS"
 CFLAGS="$CFLAGS -fvisibility=hidden "