lang.opt: Add -fmax-errors= option.

* lang.opt: Add -fmax-errors= option.
* gfortran.h (gfc_option_t): Add max_errors element.
* options.c (gfc_init_options): Set max_errors default value
to 25.
(gfc_handle_options): Assign -fmax_errors value to
gfc_option.max_errors.
* error.c (gfc_increment_error_count): New function, which
also checks whether the error count exceeds max_errors.
(gfc_warning): Use it.
(gfc_warning_now): Use it.
(gfc_notify_std): Use it.
(gfc_error): Use it.
(gfc_error_now): Use it.
(gfc_error_check): Use it.

From-SVN: r118615

gcc/fortran/ChangeLog

@@ -1,3 +1,20 @@
+2006-11-08  Brooks Moses  <brooks.moses@codesourcery.com>
+
+	* lang.opt: Add -fmax-errors= option.
+	* gfortran.h (gfc_option_t): Add max_errors element.
+	* options.c (gfc_init_options): Set max_errors default value
+	to 25.
+	(gfc_handle_options): Assign -fmax_errors value to
+	gfc_option.max_errors.
+	* error.c (gfc_increment_error_count): New function, which
+	also checks whether the error count exceeds max_errors.
+	(gfc_warning): Use it.
+	(gfc_warning_now): Use it.
+	(gfc_notify_std): Use it.
+	(gfc_error): Use it.
+	(gfc_error_now): Use it.
+	(gfc_error_check): Use it.
+
 2006-11-08  Brooks Moses  <brooks.moses@codesourcery.com>
 
 	* lang.opt: Remove non-working -qkind= option.

gcc/fortran/error.c

@@ -460,6 +460,18 @@ error_printf (const char *nocmsgid, ...)
 }
 
 
+/* Increment the number of errors, and check whether too many have 
+   been printed.  */
+
+static void
+gfc_increment_error_count (void)
+{
+  errors++;
+  if ((gfc_option.max_errors != 0) && (errors >= gfc_option.max_errors))
+    gfc_fatal_error ("Error count reached limit of %d.", gfc_option.max_errors);
+}
+
+
 /* Issue a warning.  */
 
 void
@@ -475,17 +487,17 @@ gfc_warning (const char *nocmsgid, ...)
   cur_error_buffer = &warning_buffer;
 
   va_start (argp, nocmsgid);
-  if (buffer_flag == 0)
-  {
-    warnings++;
-    if (warnings_are_errors)
-      errors++;
-  }
-
   error_print (_("Warning:"), _(nocmsgid), argp);
   va_end (argp);
 
   error_char ('\0');
+
+  if (buffer_flag == 0)
+  {
+    warnings++;
+    if (warnings_are_errors)
+      gfc_increment_error_count();
+  }
 }
 
 
@@ -530,13 +542,6 @@ gfc_notify_std (int std, const char *nocmsgid, ...)
   cur_error_buffer->flag = 1;
   cur_error_buffer->index = 0;
 
-  if (buffer_flag == 0)
-    {
-      if (warning && !warnings_are_errors)
-	warnings++;
-      else
-	errors++;
-    }
   va_start (argp, nocmsgid);
   if (warning)
     error_print (_("Warning:"), _(nocmsgid), argp);
@@ -545,6 +550,15 @@ gfc_notify_std (int std, const char *nocmsgid, ...)
   va_end (argp);
 
   error_char ('\0');
+
+  if (buffer_flag == 0)
+    {
+      if (warning && !warnings_are_errors)
+	warnings++;
+      else
+	gfc_increment_error_count();
+    }
+
   return (warning && !warnings_are_errors) ? SUCCESS : FAILURE;
 }
 
@@ -564,7 +578,7 @@ gfc_warning_now (const char *nocmsgid, ...)
   buffer_flag = 0;
   warnings++;
   if (warnings_are_errors)
-    errors++;
+    gfc_increment_error_count();
 
   va_start (argp, nocmsgid);
   error_print (_("Warning:"), _(nocmsgid), argp);
@@ -615,12 +629,13 @@ gfc_error (const char *nocmsgid, ...)
   cur_error_buffer = &error_buffer;
 
   va_start (argp, nocmsgid);
-  if (buffer_flag == 0)
-    errors++;
   error_print (_("Error:"), _(nocmsgid), argp);
   va_end (argp);
 
   error_char ('\0');
+
+  if (buffer_flag == 0)
+    gfc_increment_error_count();
 }
 
 
@@ -638,13 +653,15 @@ gfc_error_now (const char *nocmsgid, ...)
 
   i = buffer_flag;
   buffer_flag = 0;
-  errors++;
 
   va_start (argp, nocmsgid);
   error_print (_("Error:"), _(nocmsgid), argp);
   va_end (argp);
 
   error_char ('\0');
+
+  gfc_increment_error_count();
+
   buffer_flag = i;
 
   if (flag_fatal_errors)
@@ -720,11 +737,12 @@ gfc_error_check (void)
 
   if (error_buffer.flag)
     {
-      errors++;
       if (error_buffer.message != NULL)
 	fputs (error_buffer.message, stderr);
       error_buffer.flag = 0;
 
+      gfc_increment_error_count();
+
       if (flag_fatal_errors)
 	exit (1);
     }

gcc/fortran/gfortran.h

@@ -1629,6 +1629,7 @@ typedef struct
   int warn_surprising;
   int warn_tabs;
   int warn_underflow;
+  int max_errors;
 
   int flag_all_intrinsics;
   int flag_default_double;

gcc/fortran/lang.opt

@@ -169,6 +169,10 @@ ffree-line-length-
 Fortran RejectNegative Joined UInteger
 -ffree-line-length-<n>		Use n as character line width in free mode
 
+fmax-errors=
+Fortran RejectNegative Joined UInteger
+-fmax-errors=<n>	Maximum number of errors to report
+
 fmax-identifier-length=
 Fortran RejectNegative Joined UInteger
 -fmax-identifier-length=<n>	Maximum identifier length

gcc/fortran/options.c

@@ -61,6 +61,7 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_option.warn_surprising = 0;
   gfc_option.warn_tabs = 1;
   gfc_option.warn_underflow = 1;
+  gfc_option.max_errors = 25;
 
   gfc_option.flag_all_intrinsics = 0;
   gfc_option.flag_default_double = 0;
@@ -512,6 +513,10 @@ gfc_handle_option (size_t scode, const char *arg, int value)
       gfc_option.flag_implicit_none = value;
       break;
 
+    case OPT_fmax_errors_:
+      gfc_option.max_errors = value;
+      break;
+
     case OPT_fmax_stack_var_size_:
       gfc_option.flag_max_stack_var_size = value;
       break;