re PR fortran/42852 (gfortran -Wall warns about truncated lines when only a…

re PR fortran/42852 (gfortran -Wall warns about truncated lines when only a continuation character is truncated)

2010-07-25  Jerry DeLisle  <jvdelisle@gcc.gnu.org>

	PR fortran/42852
	* scanner.c (gfc_next_char_literal): Move check for truncation earlier
	in the function so that it does not get missed by early exits.
	(load_line): Add checks for quoted strings and free form comments to
	disable warnings on comments. Add check for ampersand as first
	character after truncation and don't warn for this case, but warn if
	there are subsequent non-whitespace characters.

From-SVN: r162512

gcc/fortran/ChangeLog

+2010-07-25  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
+
+	PR fortran/42852
+	* scanner.c (gfc_next_char_literal): Move check for truncation earlier
+	in the function so that it does not get missed by early exits.
+	(load_line): Add checks for quoted strings and free form comments to
+	disable warnings on comments. Add check for ampersand as first
+	character after truncation and don't warn for this case, but warn if
+	there are subsequent non-whitespace characters.
+
 2010-07-24  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/40011

gcc/fortran/scanner.c

@@ -1044,6 +1044,17 @@ restart:
 	  goto done;
 	}
 
+      /* Check to see if the continuation line was truncated.  */
+      if (gfc_option.warn_line_truncation && gfc_current_locus.lb != NULL
+	  && gfc_current_locus.lb->truncated)
+	{
+	  int maxlen = gfc_option.free_line_length;
+	  gfc_current_locus.lb->truncated = 0;
+	  gfc_current_locus.nextc += maxlen;
+	  gfc_warning_now ("Line truncated at %L", &gfc_current_locus);
+	  gfc_current_locus.nextc -= maxlen;
+	}
+
       if (c != '&')
 	goto done;
 
@@ -1095,17 +1106,6 @@ restart:
 	    }
 	}
 
-      /* Check to see if the continuation line was truncated.  */
-      if (gfc_option.warn_line_truncation && gfc_current_locus.lb != NULL
-	  && gfc_current_locus.lb->truncated)
-	{
-	  int maxlen = gfc_option.free_line_length;
-	  gfc_current_locus.lb->truncated = 0;
-	  gfc_current_locus.nextc += maxlen;
-	  gfc_warning_now ("Line truncated at %L", &gfc_current_locus);
-	  gfc_current_locus.nextc -= maxlen;
-	}
-
       /* Now find where it continues. First eat any comment lines.  */
       openmp_cond_flag = skip_free_comments ();
 
@@ -1420,7 +1420,7 @@ load_line (FILE *input, gfc_char_t **pbuf, int *pbuflen, const int *first_char)
   static int linenum = 0, current_line = 1;
   int c, maxlen, i, preprocessor_flag, buflen = *pbuflen;
   int trunc_flag = 0, seen_comment = 0;
-  int seen_printable = 0, seen_ampersand = 0;
+  int seen_printable = 0, seen_ampersand = 0, quoted = ' ';
   gfc_char_t *buffer;
   bool found_tab = false;
 
@@ -1502,6 +1502,18 @@ load_line (FILE *input, gfc_char_t **pbuf, int *pbuflen, const int *first_char)
 	  && (c == '*' || c == 'c' || c == 'd'))
 	seen_comment = 1;
 
+      if (quoted == ' ')
+	{
+	  if (c == '\'' || c == '"')
+	    quoted = c;
+	}
+      else if (c == quoted)
+	quoted = ' ';
+
+      /* Is this a free-form comment?  */
+      if (c == '!' && quoted == ' ')
+        seen_comment = 1;
+
       /* Vendor extension: "<tab>1" marks a continuation line.  */
       if (found_tab)
 	{
@@ -1550,17 +1562,33 @@ load_line (FILE *input, gfc_char_t **pbuf, int *pbuflen, const int *first_char)
 	}
       else if (i >= maxlen)
 	{
+	  bool trunc_warn = true;
+
+	  /* Enhancement, if the very next non-space character is an ampersand
+	     or comment that we would otherwise warn about, don't mark as
+	     truncated.  */
+
 	  /* Truncate the rest of the line.  */
 	  for (;;)
 	    {
 	      c = getc (input);
-	      if (c == '\r')
+	      if (c == '\r' || c == ' ')
 	        continue;
 
 	      if (c == '\n' || c == EOF)
 		break;
 
-	      trunc_flag = 1;
+	      if (!trunc_warn && c != '!')
+		trunc_warn = true;
+
+	      if (trunc_warn && (c == '&' || c == '!'))
+		trunc_warn = false;
+
+	      if (c == '!')
+		seen_comment = 1;
+
+	      if (trunc_warn && !seen_comment)
+		trunc_flag = 1;
 	    }
 
 	  c = '\n';