re PR debug/33739 (Failure of gfortran.dg/literal_character_constant_1_*.F with -m64 -g on Darwin)

	PR fortran/33739
	* scanner.c (start_source_file, end_source_file,
	exit_remaining_files): New functions.
	(gfc_advance_line): Use the new functions.

From-SVN: r130016

gcc/fortran/ChangeLog

 2007-11-08  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
 
+	PR fortran/33739
+	* scanner.c (start_source_file, end_source_file,
+	exit_remaining_files): New functions.
+	(gfc_advance_line): Use the new functions.
+
+2007-11-08  Francois-Xavier Coudert  <fxcoudert@gcc.gnu.org>
+
 	PR fortran/34028
 	* trans-intrinsic.c (gfc_conv_intrinsic_ishft): Use correct type.
 

gcc/fortran/scanner.c

@@ -300,13 +300,59 @@ gfc_at_eol (void)
 }
 
 
+struct file_entered_chainon
+{
+  gfc_file *file;
+  struct file_entered_chainon *prev;
+};
+
+static struct file_entered_chainon *last_file_entered = NULL;
+
+static void
+start_source_file (int line, gfc_file *file)
+{
+  struct file_entered_chainon *f = gfc_getmem (sizeof
+                                       (struct file_entered_chainon));
+
+  f->file = file;
+  f->prev = last_file_entered;
+  last_file_entered = f;
+
+  (*debug_hooks->start_source_file) (line, file->filename);
+}
+
+static void
+end_source_file (int line)
+{
+  gcc_assert (last_file_entered);
+  last_file_entered = last_file_entered->prev;
+  (*debug_hooks->end_source_file) (line);
+}
+
+static void
+exit_remaining_files (void)
+{
+  struct file_entered_chainon *f = last_file_entered;
+  while (f)
+    {
+      /* The line number doesn't matter much, because we're at the end of
+         the toplevel file anyway.  */
+      (*debug_hooks->end_source_file) (0);
+
+      f = f->prev;
+    }
+}
+
 /* Advance the current line pointer to the next line.  */
 
 void
 gfc_advance_line (void)
 {
   if (gfc_at_end ())
-    return;
+    {
+      exit_remaining_files ();
+      return;
+    }
 
   if (gfc_current_locus.lb == NULL) 
     {
@@ -322,17 +368,15 @@ gfc_advance_line (void)
 	  && gfc_current_locus.lb->file->up == gfc_current_locus.lb->next->file)
 	{
 	  /* We exit from an included file. */
-	  (*debug_hooks->end_source_file)
-		(gfc_linebuf_linenum (gfc_current_locus.lb->next));
+	  end_source_file (gfc_linebuf_linenum (gfc_current_locus.lb->next));
 	  gfc_current_locus.lb->next->dbg_emitted = true;
 	}
       else if (gfc_current_locus.lb->next->file != gfc_current_locus.lb->file
 	       && !gfc_current_locus.lb->next->dbg_emitted)
 	{
 	  /* We enter into a new file.  */
-	  (*debug_hooks->start_source_file)
-		(gfc_linebuf_linenum (gfc_current_locus.lb),
-		 gfc_current_locus.lb->next->file->filename);
+	  start_source_file (gfc_linebuf_linenum (gfc_current_locus.lb),
+			     gfc_current_locus.lb->next->file);
 	  gfc_current_locus.lb->next->dbg_emitted = true;
 	}
     }