PR 48915 Clarify _gfortran_set_options documentation

From-SVN: r173770

gcc/fortran/ChangeLog

+2011-05-15  Janne Blomqvist  <jb@gcc.gnu.org>
+
+	PR libfortran/48915
+	* gfortran.texi (_gfortran_set_options): Even though -fbacktrace
+	is now the default, the library defaults to backtracing disabled.
+
 2011-05-14  Tobias Burnus  <burnus@net-b.de>
 
 	* lang.opt (fdump-core): Re-add as ignored option

gcc/fortran/gfortran.texi

@@ -2611,7 +2611,7 @@ standard error.  Default: @code{GFC_STD_F95_DEL | GFC_STD_LEGACY}.
 Default: off.
 @item @var{option}[3] @tab Unused.
 @item @var{option}[4] @tab If non zero, enable backtracing on run-time
-errors.  Default: enabled.
+errors.  Default: off.
 Note: Installs a signal handler and requires command-line
 initialization using @code{_gfortran_set_args}.
 @item @var{option}[5] @tab If non zero, supports signed zeros.