cppinit.c (cpp_finish): Pop the final buffer without comment.

	* cppinit.c (cpp_finish): Pop the final buffer without comment.
	* cpplex.c (_cpp_lex_token): Don't pop the final buffer; and
	take care to avoid multiple no-newline at EOF warnings in that
	case.

From-SVN: r44701

gcc/ChangeLog

+2001-08-07  Neil Booth  <neil@daikokuya.demon.co.uk>
+
+	* cppinit.c (cpp_finish): Pop the final buffer without comment.
+	* cpplex.c (_cpp_lex_token): Don't pop the final buffer; and
+	take care to avoid multiple no-newline at EOF warnings in that
+	case.
+
 Tue Aug  7 22:18:06 CEST 2001  Jan Hubicka  <jh@suse.cz>
 
 	* calls.c (expand_call): Do not emit INSN_SETJMP note.

gcc/cppinit.c

@@ -1010,12 +1010,13 @@ void
 cpp_finish (pfile)
      cpp_reader *pfile;
 {
-  if (CPP_BUFFER (pfile))
-    {
-      cpp_ice (pfile, "buffers still stacked in cpp_finish");
-      while (CPP_BUFFER (pfile))
-	_cpp_pop_buffer (pfile);
-    }
+  /* cpplex.c leaves the final buffer on the stack.  This it so that
+     it returns an unending stream of CPP_EOFs to the client.  If we
+     popped the buffer, we'd derefence a NULL buffer pointer and
+     segfault.  It's nice to allow the client to do worry-free excess
+     cpp_get_token calls.  */
+  while (pfile->buffer)
+    _cpp_pop_buffer (pfile);
 
   /* Don't write the deps file if preprocessing has failed.  */
   if (CPP_OPTION (pfile, print_deps) && pfile->errors == 0)

gcc/cpplex.c

@@ -897,21 +897,26 @@ _cpp_lex_token (pfile, result)
 	pfile->line--;
       else if (! pfile->state.parsing_args)
 	{
-	  unsigned char ret = pfile->buffer->return_at_eof;
-
 	  /* Non-empty files should end in a newline.  Don't warn for
 	     command line and _Pragma buffers.  */
 	  if (pfile->lexer_pos.col != 0)
 	    {
-	      /* Account for the missing \n.  */
+	      /* Account for the missing \n, prevent multiple warnings.  */
 	      pfile->line++;
+	      pfile->lexer_pos.col = 0;
 	      if (!buffer->from_stage3)
 		cpp_pedwarn (pfile, "no newline at end of file");
 	    }
 
-	  _cpp_pop_buffer (pfile);
-	  if (pfile->buffer && !ret)
-	    goto next_token;
+	  /* Don't pop the last file.  */
+	  if (buffer->prev)
+	    {
+	      unsigned char stop = buffer->return_at_eof;
+
+	      _cpp_pop_buffer (pfile);
+	      if (!stop)
+		goto next_token;
+	    }
 	}
       result->type = CPP_EOF;
       return;