gfortran.h (GFC_MAX_LINE): Remove constant definition.

* gfortran.h (GFC_MAX_LINE): Remove constant definition.
(gfc_option_t): Clarify comments.
* options.c: Set default line length limits to actual default
values, rather than flag values.
* scanner.c: Eliminate checking and handling of the
fixed/free_line_length flag values.

From-SVN: r118842

gcc/fortran/ChangeLog

 2006-11-14  Brooks Moses  <brooks.moses@codesourcery.com>
  
+ 	* gfortran.h (GFC_MAX_LINE): Remove constant definition.
+ 	(gfc_option_t): Clarify comments.
+ 	* options.c: Set default line length limits to actual default
+ 	values, rather than flag values.
+ 	* scanner.c: Eliminate checking and handling of the
+ 	fixed/free_line_length flag values.
+
+2006-11-14  Brooks Moses  <brooks.moses@codesourcery.com>
+ 
  	* lang.opt: Remove -fno-backend option.
  	* gfortran.h (gfc_option_t): Remove flag_no_backend.
  	* options.c (gfc_init_options): Remove flag_no_backend.

gcc/fortran/gfortran.h

@@ -55,8 +55,7 @@ char *alloca ();
 
 /* Major control parameters.  */
 
-#define GFC_MAX_SYMBOL_LEN 63
-#define GFC_MAX_LINE 132	/* Characters beyond this are not seen.  */
+#define GFC_MAX_SYMBOL_LEN 63   /* Must be at least 63 for F2003.  */
 #define GFC_MAX_DIMENSIONS 7	/* Maximum dimensions in an array.  */
 #define GFC_LETTERS 26		/* Number of letters in the alphabet.  */
 
@@ -1602,20 +1601,16 @@ typedef struct
 {
   char *module_dir;
   gfc_source_form source_form;
-  /* When fixed_line_length or free_line_length are 0, the whole line is used.
-
-     Default is -1, the maximum line length mandated by the respective source
-     form is used:
-     for FORM_FREE GFC_MAX_LINE (132)
-     else 72.
-
-     If fixed_line_length or free_line_length is not 0 nor -1 then the user has
-     requested a specific line-length.
+  /* Maximum line lengths in fixed- and free-form source, respectively.
+     When fixed_line_length or free_line_length are 0, the whole line is used,
+     regardless of length.
 
      If the user requests a fixed_line_length <7 then gfc_init_options()
      emits a fatal error.  */
-  int fixed_line_length; /* maximum line length in fixed-form.  */
-  int free_line_length; /* maximum line length in free-form.  */
+  int fixed_line_length;
+  int free_line_length;
+  /* Maximum number of continuation lines in fixed- and free-form source,
+     respectively.  */
   int max_continue_fixed;
   int max_continue_free;
   int max_identifier_length;

gcc/fortran/options.c

@@ -46,8 +46,8 @@ gfc_init_options (unsigned int argc ATTRIBUTE_UNUSED,
   gfc_source_file = NULL;
   gfc_option.module_dir = NULL;
   gfc_option.source_form = FORM_UNKNOWN;
-  gfc_option.fixed_line_length = -1;
-  gfc_option.free_line_length = -1;
+  gfc_option.fixed_line_length = 72;
+  gfc_option.free_line_length = 132;
   gfc_option.max_continue_fixed = 19;
   gfc_option.max_continue_free = 39;
   gfc_option.max_identifier_length = GFC_MAX_SYMBOL_LEN;

gcc/fortran/scanner.c

@@ -956,33 +956,25 @@ load_line (FILE * input, char **pbuf, int *pbuflen)
   int seen_printable = 0, seen_ampersand = 0;
   char *buffer;
 
-  /* Determine the maximum allowed line length.
-     The default for free-form is GFC_MAX_LINE, for fixed-form or for
-     unknown form it is 72. Refer to the documentation in gfc_option_t.  */
+  /* Determine the maximum allowed line length.  */
   if (gfc_current_form == FORM_FREE)
-    {
-      if (gfc_option.free_line_length == -1)
-	maxlen = GFC_MAX_LINE;
-      else
-	maxlen = gfc_option.free_line_length;
-    }
+    maxlen = gfc_option.free_line_length;
   else if (gfc_current_form == FORM_FIXED)
-    {
-      if (gfc_option.fixed_line_length == -1)
-	maxlen = 72;
-      else
-	maxlen = gfc_option.fixed_line_length;
-    }
+    maxlen = gfc_option.fixed_line_length;
   else
     maxlen = 72;
 
   if (*pbuf == NULL)
     {
-      /* Allocate the line buffer, storing its length into buflen.  */
+      /* Allocate the line buffer, storing its length into buflen.
+	 Note that if maxlen==0, indicating that arbitrary-length lines
+	 are allowed, the buffer will be reallocated if this length is
+	 insufficient; since 132 characters is the length of a standard
+	 free-form line, we use that as a starting guess.  */
       if (maxlen > 0)
 	buflen = maxlen;
       else
-	buflen = GFC_MAX_LINE;
+	buflen = 132;
 
       *pbuf = gfc_getmem (buflen + 1);
     }