re PR preprocessor/48248 (Wrong error message location when compiling preprocessed code)

	PR preprocessor/48248
	* c-ppoutput.c (print): Add src_file field.
	(init_pp_output): Initialize it.
	(maybe_print_line): Don't optimize by adding up to 8 newlines
	if map->to_file and print.src_file are different file.
	(print_line): Update print.src_file.

From-SVN: r171693

gcc/ChangeLog

+2011-03-29  Jakub Jelinek  <jakub@redhat.com>
+
+	PR preprocessor/48248
+	* c-ppoutput.c (print): Add src_file field.
+	(init_pp_output): Initialize it.
+	(maybe_print_line): Don't optimize by adding up to 8 newlines
+	if map->to_file and print.src_file are different file.
+	(print_line): Update print.src_file.
+
 2011-03-29  Vladimir Makarov  <vmakarov@redhat.com>
 
 	* ira-conflicts.c (build_object_conflicts): Add unused attribute

gcc/c-family/c-ppoutput.c

@@ -36,6 +36,7 @@ static struct
   int src_line;			/* Line number currently being written.  */
   unsigned char printed;	/* Nonzero if something output at line.  */
   bool first_time;		/* pp_file_change hasn't been called yet.  */
+  const char *src_file;		/* Current source file.  */
 } print;
 
 /* Defined and undefined macros being queued for output with -dU at
@@ -153,6 +154,7 @@ init_pp_output (FILE *out_stream)
   print.prev = 0;
   print.outf = out_stream;
   print.first_time = 1;
+  print.src_file = "";
 }
 
 /* Writes out the preprocessed file, handling spacing and paste
@@ -312,7 +314,9 @@ maybe_print_line (source_location src_loc)
       print.printed = 0;
     }
 
-  if (src_line >= print.src_line && src_line < print.src_line + 8)
+  if (src_line >= print.src_line
+      && src_line < print.src_line + 8
+      && strcmp (map->to_file, print.src_file) == 0)
     {
       while (src_line > print.src_line)
 	{
@@ -344,6 +348,7 @@ print_line (source_location src_loc, const char *special_flags)
       unsigned char *p;
 
       print.src_line = SOURCE_LINE (map, src_loc);
+      print.src_file = map->to_file;
 
       /* cpp_quote_string does not nul-terminate, so we have to do it
 	 ourselves.  */