Re: 1.875: can't compile output with g++-2.95.3

[Paul Eggert]

Thanks for your bug report.  We've installed the following patches
and they should appear in the next Bison version.

2003-01-04  Paul Eggert  <address@hidden>

        * data/yacc.c (yyerrlab1): Omit attribute if __cplusplus is defined,
        since GNU C++ (as of 3.2.1) does not allow attributes on labels.
        Problem reported by Nelson H. F. Beebe.

2003-01-02  Paul Eggert  <address@hidden>

        * data/yacc.c (yyerrlab1): Append `;' after attribute, to
        pacify the buggy "smart preprocessor" in MacOS 10.2.3.
        Bug reported by Nelson H. F. Beebe.

--- data/yacc.c 28 Dec 2002 08:36:02 -0000      1.47
+++ data/yacc.c 5 Jan 2003 00:48:16 -0000       1.50
@@ -1,7 +1,7 @@
 m4_divert(-1)                                                       -*- C -*-
 
 # Yacc compatible skeleton for Bison
-# Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002
+# Copyright (C) 1984, 1989, 1990, 2000, 2001, 2002, 2003
 # Free Software Foundation, Inc.
 
 # This program is free software; you can redistribute it and/or modify
@@ -134,7 +134,7 @@ m4_changecom()
 m4_divert(0)dnl
 @output @output_parser_name@
 b4_copyright([Skeleton parser for Yacc-like parsing with Bison],
-             [1984, 1989, 1990, 2000, 2001, 2002])[
+             [1984, 1989, 1990, 2000, 2001, 2002, 2003])[
 
 /* As a special exception, when this file is copied by Bison into a
    Bison output file, you may use that output file without restriction.
@@ -1112,9 +1112,13 @@ yyerrlab:
 yyerrlab1:
 
   /* Suppress GCC warning that yyerrlab1 is unused when no action
-     invokes YYERROR.  */
+     invokes YYERROR.  MacOS 10.2.3's buggy "smart preprocessor"
+     insists on the trailing semicolon.  */
 #if defined (__GNUC_MINOR__) && 2093 <= (__GNUC__ * 1000 + __GNUC_MINOR__)
-  __attribute__ ((__unused__))
+  /* GNU C++ (as of version 3.2.1) does not allow attributes on labels.  */
+# ifndef __cplusplus
+  __attribute__ ((__unused__));
+# endif
 #endif
 
 ]b4_location_if([  yylerrsp = yylsp;
@@ -1204,7 +1208,7 @@ b4_epilogue
 m4_if(b4_defines_flag, 0, [],
 address@hidden @output_header_name@
 b4_copyright([Skeleton parser for Yacc-like parsing with Bison],
-             [1984, 1989, 1990, 2000, 2001, 2002])
+             [1984, 1989, 1990, 2000, 2001, 2002, 2003])
 
 /* As a special exception, when this file is copied by Bison into a
    Bison output file, you may use that output file without restriction.