invoke.texi: Document -Wunderflow and spell check.

	* invoke.texi: Document -Wunderflow and spell check.
	* lang.opt: Add Wunderflow.
	* gfortran.h (gfc_option_t): Add warn_underflow option.
	* options.c (gfc_init_options, set_Wall): Use it.
	* primary.c (match_real_constant): Explicitly handle UNDERFLOW.
	* arith.c (gfc_arith_uminus, gfc_arith_plus, gfc_arith_minus,
	gfc_arith_times, gfc_arith_divide, gfc_arith_power, gfc_real2real,
	gfc_real2complex, gfc_complex2real, gfc_complex2complex): Ditto.
	* arith.c (common_logarithm): Fix typo in comment.

From-SVN: r82130

1 files changed, 6 insertions, 0 deletions

diff --git a/gcc/fortran/options.c b/gcc/fortran/options.c
index f0135bd..b0f9a76 100644
--- a/gcc/fortran/options.c
+++ b/gcc/fortran/options.c
@@ -56,6 +56,7 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_option.warn_conversion = 0;
   gfc_option.warn_implicit_interface = 0;
   gfc_option.warn_line_truncation = 0;
+  gfc_option.warn_underflow = 1;
   gfc_option.warn_surprising = 0;
   gfc_option.warn_unused_labels = 0;
 
@@ -123,6 +124,7 @@ set_Wall (void)
 
   gfc_option.warn_aliasing = 1;
   gfc_option.warn_line_truncation = 1;
+  gfc_option.warn_underflow = 1;
   gfc_option.warn_surprising = 1;
   gfc_option.warn_unused_labels = 1;
 
@@ -198,6 +200,10 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.warn_line_truncation = value;
       break;
 
+    case OPT_Wunderflow:
+      gfc_option.warn_underflow = value;
+      break;
+
     case OPT_Wsurprising:
       gfc_option.warn_surprising = value;
       break;