cppmacro.c (_cpp_backup_tokens): Revert previous check-in.

	* cppmacro.c (_cpp_backup_tokens): Revert previous check-in.
	Don't fall off the base token run.
	* gcc.dg/cpp/fpreprocessed.c: New test case.

From-SVN: r47182

gcc/ChangeLog

+2001-11-19  Neil Booth  <neil@daikokuya.demon.co.uk>
+
+	* cppmacro.c (_cpp_backup_tokens): Revert previous check-in.
+	Don't fall off the base token run.
+
 2001-11-19  Jason Wilkins <fenix@io.com>
 
 	* Makefile.in: Use INSTALL_SCRIPT not INSTALL_PROGRAM.

gcc/cppmacro.c

@@ -1087,12 +1087,14 @@ _cpp_backup_tokens (pfile, count)
       pfile->lookaheads += count;
       while (count--)
 	{
-	  if (pfile->cur_token == pfile->cur_run->base)
+	  pfile->cur_token--;
+	  if (pfile->cur_token == pfile->cur_run->base
+	      /* Possible with -fpreprocessed and no leading #line.  */
+	      && pfile->cur_run->prev != NULL)
 	    {
 	      pfile->cur_run = pfile->cur_run->prev;
 	      pfile->cur_token = pfile->cur_run->limit;
 	    }
-	  pfile->cur_token--;
 	}
     }
   else

gcc/testsuite/ChangeLog

+2001-11-19  Neil Booth  <neil@daikokuya.demon.co.uk>
+
+	* gcc.dg/cpp/fpreprocessed.c: New test case.
+
 2001-11-18  Joseph S. Myers  <jsm28@cam.ac.uk>
 
 	* gcc.dg/cpp/assert_trad1.c, gcc.dg/cpp/tr-paste.c,