invoke.texi (-Ofast): Also enables -fstack-arrays.

2011-05-14  Tobias Burnus  <burnus@net-b.de>

        * doc/invoke.texi (-Ofast): Also enables -fstack-arrays.

2011-05-14  Tobias Burnus  <burnus@net-b.de>

        * options.c (gfc_init_options, gfc_post_options): Enable
        -fstack-arrays by default if -Ofast is used.
        * invoke.texi (-fstack-arrays): Document this.

From-SVN: r173751

3 files changed, 26 insertions, 15 deletions

diff --git a/gcc/fortran/ChangeLog b/gcc/fortran/ChangeLog
index afc5533..b416831 100644
--- a/gcc/fortran/ChangeLog
+++ b/gcc/fortran/ChangeLog
@@ -1,21 +1,27 @@
+2011-05-14  Tobias Burnus  <burnus@net-b.de>
+
+	* options.c (gfc_init_options, gfc_post_options): Enable
+	-fstack-arrays by default if -Ofast is used.
+	* invoke.texi (-fstack-arrays): Document this.
+
 2011-05-14  Janne Blomqvist  <jb@gcc.gnu.org>
 
-        PR libfortran/48915
-        * gfortran.h (gfc_option_t): Remove flag_dump_core.
-        * gfortran.texi (GFORTRAN_ERROR_DUMPCORE): Remove section.
-        (GFORTRAN_ERROR_BACKTRACE): Document that it's enabled by default.
-        * intrinsic.texi (ABORT): Remove explanation of -fdump-core.
-        * invoke.texi: Remove -fdump-core, document that -fbacktrace is
-        enabled by default.
-        * lang.opt: Remove -fdump-core.
-        * options.c (gfc_init_options): Make backtrace default to enabled,
-        remove dump_core.
-        (gfc_handle_option): Remove OPT_fdump-core.
-        * trans-decl.c: Pass a 0 to preserve ABI.
+	PR libfortran/48915
+	* gfortran.h (gfc_option_t): Remove flag_dump_core.
+	* gfortran.texi (GFORTRAN_ERROR_DUMPCORE): Remove section.
+	(GFORTRAN_ERROR_BACKTRACE): Document that it's enabled by default.
+	* intrinsic.texi (ABORT): Remove explanation of -fdump-core.
+	* invoke.texi: Remove -fdump-core, document that -fbacktrace is
+	enabled by default.
+	* lang.opt: Remove -fdump-core.
+	* options.c (gfc_init_options): Make backtrace default to enabled,
+	remove dump_core.
+	(gfc_handle_option): Remove OPT_fdump-core.
+	* trans-decl.c: Pass a 0 to preserve ABI.
 
 2011-05-14  Janne Blomqvist  <jb@gcc.gnu.org>
 
-        * gfortran.texi: Remove GFORTRAN_USE_STDERR documentation.
+	* gfortran.texi: Remove GFORTRAN_USE_STDERR documentation.
 
 2011-05-13  Tobias Burnus  <burnus@net-b.de>
 
diff --git a/gcc/fortran/invoke.texi b/gcc/fortran/invoke.texi
index f68b18c..ab45072 100644
--- a/gcc/fortran/invoke.texi
+++ b/gcc/fortran/invoke.texi
@@ -1381,7 +1381,9 @@ The default value for @var{n} is 32768.
 Adding this option will make the fortran compiler put all local arrays,
 even those of unknown size onto stack memory.  If your program uses very
 large local arrays it's possible that you'll have to extend your runtime
-limits for stack memory on some operating systems.
+limits for stack memory on some operating systems. This flag is enabled
+by default at optimization level @option{-Ofast}.
+
 
 @item -fpack-derived
 @opindex @code{fpack-derived}
diff --git a/gcc/fortran/options.c b/gcc/fortran/options.c
index d4778ba..920b95f 100644
--- a/gcc/fortran/options.c
+++ b/gcc/fortran/options.c
@@ -125,7 +125,7 @@ gfc_init_options (unsigned int decoded_options_count,
 
   /* Default value of flag_max_stack_var_size is set in gfc_post_options.  */
   gfc_option.flag_max_stack_var_size = -2;
-  gfc_option.flag_stack_arrays = 0;
+  gfc_option.flag_stack_arrays = -1;
 
   gfc_option.flag_range_check = 1;
   gfc_option.flag_pack_derived = 0;
@@ -274,6 +274,9 @@ gfc_post_options (const char **pfilename)
   if (gfc_option.flag_protect_parens == -1)
     gfc_option.flag_protect_parens = !optimize_fast;
 
+  if (gfc_option.flag_stack_arrays == -1)
+    gfc_option.flag_stack_arrays = optimize_fast;
+
   /* By default, disable (re)allocation during assignment for -std=f95,
      and enable it for F2003/F2008/GNU/Legacy. */
   if (gfc_option.flag_realloc_lhs == -1)