version 3.7.5

* NEWS: Record release date.
tables: fix handling for useless tokens
2026-08-11 03:35:15 +00:00 · 2021-01-24 08:30:41 +01:00 · 2021-01-24 08:28:45 +01:00 · 2021-01-24 08:24:56 +01:00 · 2021-01-23 15:08:48 +01:00 · 2021-01-23 15:02:49 +01:00
243 changed files with 899 additions and 452 deletions
@@ -1 +1 @@
-3.7.3
+3.7.4
@@ -24,7 +24,7 @@ and nasty bugs.

 -----

-Copyright (C) 1998-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 1998-2015, 2018-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.

@@ -26733,7 +26733,7 @@

 	-----

-	Copyright (C) 1987-1988, 1991-2015, 2018-2020 Free Software
+	Copyright (C) 1987-1988, 1991-2015, 2018-2021 Free Software
 	Foundation, Inc.

 	Copying and distribution of this file, with or without
@@ -1,6 +1,6 @@
 ## Process this file with automake to produce Makefile.in.

-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -133,9 +133,10 @@ gen-ChangeLog:
 	$(CC) $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -o $@ -E $<

 .PHONY: codespell
+CODESPELL = codespell
 codespell:
 	$(AM_V_GEN) cd $(srcdir) \
-	&& codespell \
+	&& $(CODESPELL) \
 	     --regex "[\\w\\-'’\`]+\+*" \
 	     --ignore-words-list "ba,circularly,cloneable,copyable,define'd,dout,froms,iff,ifset,od,ois" \
 	     $$(git ls-files data doc lib src tests)
@@ -1,5 +1,29 @@
 GNU Bison NEWS

+* Noteworthy changes in release 3.7.5 (2021-01-24) [stable]
+
+** Bug fixes
+
+*** Counterexample Generation
+
+  In some cases counterexample generation could crash.  This is fixed.
+
+*** Fix Table Generation
+
+  In some very rare conditions, when there are many useless tokens, it was
+  possible to generate incorrect parsers.
+
+*** GLR parsers now support %merge together with api.value.type=union.
+
+*** C++ parsers use noexcept in more places.
+
+*** Generated parsers avoid some warnings about signedness issues.
+
+*** C-language parsers now avoid warnings from pedantic clang.
+
+*** C-language parsers now work around quirks of HP-UX 11.23 (2003).
+
+
 * Noteworthy changes in release 3.7.4 (2020-11-14) [stable]

 ** Bug fixes
@@ -4548,7 +4572,7 @@ mode: outline
 fill-column: 76
 End:

-Copyright (C) 1995-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 1995-2015, 2018-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Parser Generator.

@@ -36,7 +36,7 @@ to the bison package.

 -----

-Copyright (C) 2002, 2005, 2009-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002, 2005, 2009-2015, 2018-2021 Free Software Foundation,
 Inc.

 This file is part of Bison, the GNU Compiler Compiler.
@@ -120,7 +120,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2020 Free
+Copyright (C) 1992, 1998-1999, 2003-2005, 2008-2015, 2018-2021 Free
 Software Foundation, Inc.

 This file is part of GNU bison, the GNU Compiler Compiler.
@@ -12,7 +12,7 @@ the problems you encounter.

 -----

-Copyright (C) 2002, 2004, 2009-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002, 2004, 2009-2015, 2018-2021 Free Software Foundation,
 Inc.

 This file is part of GNU Bison.
@@ -569,7 +569,7 @@ bootstrapped.

 <!--

-Copyright (C) 2002-2005, 2007-2015, 2018-2020 Free Software Foundation,
+Copyright (C) 2002-2005, 2007-2015, 2018-2021 Free Software Foundation,
 Inc.

 This file is part of GNU Bison.
@@ -237,7 +237,7 @@ End:

 -----

-Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Parser Generator.

@@ -877,7 +877,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2020 Free Software
+Copyright (C) 2001-2004, 2006, 2008-2015, 2018-2021 Free Software
 Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.
@@ -1,6 +1,6 @@
 # Bootstrap configuration.

-# Copyright (C) 2006-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2006-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -2,7 +2,7 @@

 # Generate a release announcement message.

-# Copyright (C) 2007-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2000-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2000-2015, 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -3,7 +3,7 @@
 # Update b4_copyright invocations or b4_copyright_years definitions to
 # include the current year.

-# Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2009-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -2,7 +2,7 @@

 # In configure.ac, update PACKAGE_COPYRIGHT_YEAR to the current year.

-# Copyright (C) 2010-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2010-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -2,7 +2,7 @@

 # Update expectations in an Autotest test suite.

-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,5 +1,5 @@
 ## Customize maint.mk                           -*- makefile -*-
-## Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.

 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -156,6 +156,7 @@ exclude = \
 $(call exclude,                                                                 \
  bindtextdomain=^lib/main.c$$                                                  \
  cast_of_argument_to_free=^src/muscle-tab.c$$                                  \
+  copyright_check=gnulib/lib/version-etc.c$$                                    \
  error_message_uppercase=etc/bench.pl.in$$                                     \
  po_check=^tests|(^po/POTFILES.in|.md)$$                                       \
  preprocessor_indentation=^data/|^lib/|^src/parse-gram.[ch]$$                  \
@@ -1,6 +1,6 @@
 # Configure template for GNU Bison.                   -*-Autoconf-*-
 #
-# Copyright (C) 2001-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2001-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -29,7 +29,7 @@ AC_INIT([GNU Bison],
        [[email protected]],
        [],
        [https://www.gnu.org/software/bison/])
-AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2020])
+AC_SUBST([PACKAGE_COPYRIGHT_YEAR], [2021])
 AC_DEFINE_UNQUOTED([PACKAGE_COPYRIGHT_YEAR], [$PACKAGE_COPYRIGHT_YEAR],
                   [The copyright year for this package])

@@ -142,11 +142,17 @@ The macro `b4_symbol(NUM, FIELD)` gives access to the following FIELDS:
  When api.value.type=union, the generated name for the union member.
  yytype_INT etc. for symbols that has_id, otherwise yytype_1 etc.

- `type`
+- `type`: string
  If it has a semantic value, its type tag, or, if variant are used,
  its type.
  In the case of api.value.type=union, type is the real type (e.g. int).

+- `slot`: string
+  If it has a semantic value, the name of the union member (i.e., bounces to
+  either `type_tag` or `type`).  It would be better to fix our mess and
+  always use `type` for the true type of the member, and `type_tag` for the
+  name of the union member.
+
 - `has_printer`: 0, 1
 - `printer`: string
 - `printer_file`: string
@@ -187,7 +193,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2002, 2008-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2002, 2008-2015, 2018-2021 Free Software Foundation, Inc.

 This file is part of GNU Bison.

@@ -1,5 +1,5 @@
 /* Default styling rules for Bison when doing terminal output.
-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2002, 2005-2015, 2018-2020 Free Software Foundation,
+## Copyright (C) 2002, 2005-2015, 2018-2021 Free Software Foundation,
 ## Inc.

 ## This program is free software: you can redistribute it and/or modify
@@ -2,7 +2,7 @@

 # Language-independent M4 Macros for Bison.

-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2002, 2004-2015, 2018-2021 Free Software Foundation,
 # Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -465,6 +465,19 @@ m4_case([$1],
 # but are S_YYEMPTY and symbol_kind::S_YYEMPTY in C++.
 m4_copy([b4_symbol_kind_base], [b4_symbol_kind])

+
+# b4_symbol_slot(NUM)
+# -------------------
+# The name of union member that contains the value of these symbols.
+# Currently, we are messy, this should actually be type_tag, but type_tag
+# has several meanings.
+m4_define([b4_symbol_slot],
+[m4_case(b4_percent_define_get([[api.value.type]]),
+         [union],   [b4_symbol([$1], [type_tag])],
+         [variant], [b4_symbol([$1], [type_tag])],
+         [b4_symbol([$1], [type])])])
+
+
 # b4_symbol(NUM, FIELD)
 # ---------------------
 # Fetch FIELD of symbol #NUM (or "orig NUM").  Fail if undefined.
@@ -475,6 +488,7 @@ m4_define([b4_symbol],
         [id],        [b4_symbol_token_kind([$1])],
         [kind_base], [b4_symbol_kind_base([$1])],
         [kind],      [b4_symbol_kind([$1])],
+         [slot],      [b4_symbol_slot([$1])],
         [_b4_symbol($@)])])


@@ -537,7 +551,7 @@ m4_defn([b4_actions_])[]dnl
        break;
    }dnl
 ],
-[YYUSE (m4_default([$2], [yykind]));])dnl
+[YY_USE (m4_default([$2], [yykind]));])dnl
 m4_popdef([b4_actions_])dnl
 ])

@@ -2,7 +2,7 @@

 # C++ skeleton dispatching for Bison.

-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -2,7 +2,7 @@

 # C++ skeleton for Bison

-# Copyright (C) 2002-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -340,7 +340,7 @@ m4_define([b4_symbol_type_define],
      }

      /// Destroy contents, and record that is empty.
-      void clear ()
+      void clear () YY_NOEXCEPT
      {]b4_variant_if([[
        // User destructor.
        symbol_kind_type yykind = this->kind ();
@@ -424,7 +424,7 @@ m4_define([b4_symbol_type_define],
      by_kind (kind_type t);

      /// Record that this symbol is empty.
-      void clear ();
+      void clear () YY_NOEXCEPT;

      /// Steal the symbol kind from \a that.
      void move (by_kind& that);
@@ -544,7 +544,7 @@ m4_define([b4_public_types_define],
  {}

  ]b4_inline([$1])[void
-  ]b4_parser_class[::by_kind::clear ()
+  ]b4_parser_class[::by_kind::clear () YY_NOEXCEPT
  {
    kind_ = ]b4_symbol(-2, kind)[;
  }
@@ -2,7 +2,7 @@

 # Common code for C-like languages (C, C++, Java, etc.)

-# Copyright (C) 2012-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -2,7 +2,7 @@

 # C skeleton dispatching for Bison.

-# Copyright (C) 2006-2007, 2009-2015, 2018-2020 Free Software
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
 # Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -2,7 +2,7 @@

 # C M4 Macros for Bison.

-# Copyright (C) 2002, 2004-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2002, 2004-2015, 2018-2021 Free Software Foundation,
 # Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -160,11 +160,11 @@ m4_popdef([$1])dnl

 # b4_parse_param_use([VAL], [LOC])
 # --------------------------------
-# 'YYUSE' VAL, LOC if locations are enabled, and all the parse-params.
+# 'YY_USE' VAL, LOC if locations are enabled, and all the parse-params.
 m4_define([b4_parse_param_use],
-[m4_ifvaln([$1], [  YYUSE ([$1]);])dnl
-b4_locations_if([m4_ifvaln([$2], [  YYUSE ([$2]);])])dnl
-b4_parse_param_for([Decl], [Formal], [  YYUSE (Formal);
+[m4_ifvaln([$1], [  YY_USE ([$1]);])dnl
+b4_locations_if([m4_ifvaln([$2], [  YY_USE ([$2]);])])dnl
+b4_parse_param_for([Decl], [Formal], [  YY_USE (Formal);
 ])dnl
 ])

@@ -242,6 +242,18 @@ typedef int_least16_t yytype_int16;
 typedef short yytype_int16;
 #endif

+/* Work around bug in HP-UX 11.23, which defines these macros
+   incorrectly for preprocessor constants.  This workaround can likely
+   be removed in 2023, as HPE has promised support for HP-UX 11.23
+   (aka HP-UX 11i v2) only through the end of 2022; see Table 2 of
+   <https://h20195.www2.hpe.com/V2/getpdf.aspx/4AA4-7673ENW.pdf>.  */
+#ifdef __hpux
+# undef UINT_LEAST8_MAX
+# undef UINT_LEAST16_MAX
+# define UINT_LEAST8_MAX 255
+# define UINT_LEAST16_MAX 65535
+#endif
+
 #if defined __UINT_LEAST8_MAX__ && __UINT_LEAST8_MAX__ <= __INT_MAX__
 typedef __UINT_LEAST8_TYPE__ yytype_uint8;
 #elif (!defined __UINT_LEAST8_MAX__ && defined YY_STDINT_H \
@@ -366,14 +378,16 @@ dnl use C' _Noreturn in C++, to avoid -Wc11-extensions warnings.
      && ((201103 <= __cplusplus && !(__GNUC__ == 4 && __GNUC_MINOR__ == 7)) \
          || (defined _MSC_VER && 1900 <= _MSC_VER)))
 #  define _Noreturn [[noreturn]]
-# elif (!defined __cplusplus                     \
-        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0)  \
-            || 4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
-            || (defined __apple_build_version__ \
-                ? 6000000 <= __apple_build_version__ \
-                : 3 < __clang_major__ + (5 <= __clang_minor__))))
+# elif ((!defined __cplusplus || defined __clang__) \
+        && (201112 <= (defined __STDC_VERSION__ ? __STDC_VERSION__ : 0) \
+            || (!defined __STRICT_ANSI__ \
+                && (__4 < __GNUC__ + (7 <= __GNUC_MINOR__) \
+                    || (defined __apple_build_version__ \
+                        ? 6000000 <= __apple_build_version__ \
+                        : 3 < __clang_major__ + (5 <= __clang_minor__))))))
   /* _Noreturn works as-is.  */
-# elif 2 < __GNUC__ + (8 <= __GNUC_MINOR__) || 0x5110 <= __SUNPRO_C
+# elif (2 < __GNUC__ + (8 <= __GNUC_MINOR__) || defined __clang__ \
+        || 0x5110 <= __SUNPRO_C)
 #  define _Noreturn __attribute__ ((__noreturn__))
 # elif 1200 <= (defined _MSC_VER ? _MSC_VER : 0)
 #  define _Noreturn __declspec (noreturn)
@@ -384,9 +398,9 @@ dnl use C' _Noreturn in C++, to avoid -Wc11-extensions warnings.

 ]])[/* Suppress unused-variable warnings by "using" E.  */
 #if ! defined lint || defined __GNUC__
-# define YYUSE(E) ((void) (E))
+# define YY_USE(E) ((void) (E))
 #else
-# define YYUSE(E) /* empty */
+# define YY_USE(E) /* empty */
 #endif

 #if defined __GNUC__ && ! defined __ICC && 407 <= __GNUC__ * 100 + __GNUC_MINOR__
@@ -2,7 +2,7 @@

 # D skeleton dispatching for Bison.

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -2,7 +2,7 @@

 # D language support for Bison

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,8 +1,8 @@
-                                                                    -*- C -*-
+#                                                             -*- C -*-

 # GLR skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -145,6 +145,15 @@ m4_define([b4_rhs_location],
 [(b4_rhs_data([$1], [$2]).yyloc)])


+# b4_call_merger(MERGER-NUM, MERGER-NAME, SYMBOL-SUM)
+# ---------------------------------------------------
+m4_define([b4_call_merger],
+[b4_case([$1],
+         [    b4_symbol_if([$3], [has_type],
+                           [yy0->b4_symbol($3, slot) = $2 (*yy0, *yy1);],
+                           [*yy0 = $2 (*yy0, *yy1);])])])
+
+
 ## -------------- ##
 ## Declarations.  ##
 ## -------------- ##
@@ -188,7 +197,7 @@ b4_glr_cc_if([],
 [b4_defines_if(
 [b4_output_begin([b4_spec_header_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 ]b4_cpp_guard_open([b4_spec_mapped_header_file])[
 ]b4_shared_declarations[
 ]b4_cpp_guard_close([b4_spec_mapped_header_file])[
@@ -202,7 +211,7 @@ b4_copyright([Skeleton interface for Bison GLR parsers in C],

 b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison GLR parsers in C],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 /* C GLR parser skeleton written by Paul Hilfinger.  */

 ]b4_disclaimer[
@@ -215,7 +224,7 @@ b4_copyright([Skeleton implementation for Bison GLR parsers in C],
 #define YYLTYPE ]b4_api_PREFIX[LTYPE]])])[
 ]m4_if(b4_prefix, [yy], [],
 [[/* Substitute the variable and function names.  */
-#define yyparse ]b4_prefix[parse
+#define ]b4_glr_cc_if([yy_parse_impl], [yyparse])[ ]b4_prefix[]b4_glr_cc_if([_parse_impl], [parse])[
 #define yylex   ]b4_prefix[lex
 #define yyerror ]b4_prefix[error
 #define yydebug ]b4_prefix[debug]]b4_pure_if([], [[
@@ -875,7 +884,7 @@ yyuserAction (yyRuleNum yyn, int yyrhslen, yyGLRStackItem* yyvsp,
  yybool yynormal YY_ATTRIBUTE_UNUSED = yystackp->yysplitPoint == YY_NULLPTR;
  int yylow;
 ]b4_parse_param_use([yyvalp], [yylocp])dnl
-[  YYUSE (yyrhslen);
+[  YY_USE (yyrhslen);
 # undef yyerrok
 # define yyerrok (yystackp->yyerrState = 0)
 # undef YYACCEPT
@@ -939,8 +948,8 @@ yyuserAction (yyRuleNum yyn, int yyrhslen, yyGLRStackItem* yyvsp,
 static void
 yyuserMerge (int yyn, YYSTYPE* yy0, YYSTYPE* yy1)
 {
-  YYUSE (yy0);
-  YYUSE (yy1);
+  YY_USE (yy0);
+  YY_USE (yy1);

  switch (yyn)
    {
@@ -1795,8 +1804,8 @@ static YYRESULTTAG
 yyreportAmbiguity (yySemanticOption* yyx0,
                   yySemanticOption* yyx1]b4_pure_formals[)
 {
-  YYUSE (yyx0);
-  YYUSE (yyx1);
+  YY_USE (yyx0);
+  YY_USE (yyx1);

 #if ]b4_api_PREFIX[DEBUG
  YY_FPRINTF ((stderr, "Ambiguity detected.\n"));
@@ -2140,7 +2149,7 @@ yypcontext_token (const yyGLRStack *yystackp) YY_ATTRIBUTE_UNUSED;
 static yysymbol_kind_t
 yypcontext_token (const yyGLRStack *yystackp)
 {
-  YYUSE (yystackp);
+  YY_USE (yystackp);
  yysymbol_kind_t yytoken = yychar == ]b4_symbol(-2, id)[ ? ]b4_symbol(-2, kind)[ : YYTRANSLATE (yychar);
  return yytoken;
 }
@@ -2152,7 +2161,7 @@ yypcontext_location (const yyGLRStack *yystackp) YY_ATTRIBUTE_UNUSED;
 static YYLTYPE *
 yypcontext_location (const yyGLRStack *yystackp)
 {
-  YYUSE (yystackp);
+  YY_USE (yystackp);
  return &yylloc;
 }]])],
         [detailed\|verbose],
@@ -2420,7 +2429,7 @@ yyrecoverSyntaxError (yyGLRStack* yystackp]b4_user_formals[)
 `----------*/

 int
-yyparse (]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param)], [void])[)
+]b4_glr_cc_if([yy_parse_impl], [yyparse])[ (]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param)], [void])[)
 {
  int yyresult;
  yyGLRStack yystack;
@@ -1,6 +1,6 @@
 # C++ GLR skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -144,7 +144,7 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
  int
  ]b4_parser_class[::parse ()
  {
-    return ::yyparse (*this]b4_user_args[);
+    return ::yy_parse_impl (*this]b4_user_args[);
  }

 #if ]b4_api_PREFIX[DEBUG
@@ -157,11 +157,11 @@ m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
                           const semantic_type* yyvaluep]b4_locations_if([[,
                           const location_type* yylocationp]])[) const
  {]b4_locations_if([[
-    YYUSE (yylocationp);]])[
-    YYUSE (yyvaluep);
+    YY_USE (yylocationp);]])[
+    YY_USE (yyvaluep);
    std::ostream& yyo = debug_stream ();
    std::ostream& yyoutput = yyo;
-    YYUSE (yyoutput);
+    YY_USE (yyoutput);
    ]b4_symbol_actions([printer])[
  }

@@ -381,7 +381,7 @@ b4_percent_code_get([[requires]])[
 ]b4_defines_if(
 [b4_output_begin([b4_spec_header_file])
 b4_copyright([Skeleton interface for Bison GLR parsers in C++],
-             [2002-2015, 2018-2020])[
+             [2002-2015, 2018-2021])[
 // C++ GLR parser skeleton written by Akim Demaille.

 ]b4_disclaimer[
@@ -2,7 +2,7 @@

 # Java skeleton dispatching for Bison.

-# Copyright (C) 2007, 2009-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
 # Inc.

 # This program is free software: you can redistribute it and/or modify
@@ -2,7 +2,7 @@

 # Java language support for Bison

-# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -160,7 +160,7 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))])])


 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018-2020])
+           [2002-2015, 2018-2021])

 m4_define([b4_parser_class],
          [b4_percent_define_get([[api.parser.class]])])
@@ -271,9 +271,9 @@ m4_define([b4_shared_declarations],
    {
    public:
      context (const ]b4_parser_class[& yyparser, const symbol_type& yyla);
-      const symbol_type& lookahead () const { return yyla_; }
-      symbol_kind_type token () const { return yyla_.kind (); }]b4_locations_if([[
-      const location_type& location () const { return yyla_.location; }
+      const symbol_type& lookahead () const YY_NOEXCEPT { return yyla_; }
+      symbol_kind_type token () const YY_NOEXCEPT { return yyla_.kind (); }]b4_locations_if([[
+      const location_type& location () const YY_NOEXCEPT { return yyla_.location; }
 ]])[
      /// Put in YYARG at most YYARGN of the expected tokens, and return the
      /// number of tokens stored in YYARG.  If YYARG is null, return the
@@ -597,7 +597,7 @@ m4_if(b4_prefix, [yy], [],
 #else // !]b4_api_PREFIX[DEBUG

 # define YYCDEBUG if (false) std::cerr
-# define YY_SYMBOL_PRINT(Title, Symbol)  YYUSE (Symbol)
+# define YY_SYMBOL_PRINT(Title, Symbol)  YY_USE (Symbol)
 # define YY_REDUCE_PRINT(Rule)           static_cast<void> (0)
 # define YY_STACK_PRINT()                static_cast<void> (0)

@@ -736,7 +736,7 @@ m4_if(b4_prefix, [yy], [],
  ]b4_parser_class[::yy_print_ (std::ostream& yyo, const basic_symbol<Base>& yysym) const
  {
    std::ostream& yyoutput = yyo;
-    YYUSE (yyoutput);
+    YY_USE (yyoutput);
    if (yysym.empty ())
      yyo << "empty symbol";
    else
@@ -1,6 +1,6 @@
 # D skeleton for Bison -*- autoconf -*-

-# Copyright (C) 2007-2012, 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2012, 2019-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@ m4_include(b4_skeletonsdir/[d.m4])

 b4_output_begin([b4_parser_file_name])
 b4_copyright([Skeleton implementation for Bison LALR(1) parsers in D],
-             [2007-2012, 2019-2020])[
+             [2007-2012, 2019-2021])[
 ]b4_disclaimer[
 ]b4_percent_define_ifdef([package], [module b4_percent_define_get([package]);
 ])[
@@ -1,6 +1,6 @@
 # Java skeleton for Bison                           -*- autoconf -*-

-# Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -78,7 +78,7 @@ m4_define([b4_define_state],[[

 ]b4_output_begin([b4_parser_file_name])[
 ]b4_copyright([Skeleton implementation for Bison LALR(1) parsers in Java],
-              [2007-2015, 2018-2020])[
+              [2007-2015, 2018-2021])[
 ]b4_disclaimer[
 ]b4_percent_define_ifdef([api.package], [package b4_percent_define_get([api.package]);[
 ]])[
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 m4_pushdef([b4_copyright_years],
-           [2002-2015, 2018-2020])
+           [2002-2015, 2018-2021])


 # b4_position_file
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 # C++ skeleton for Bison

-# Copyright (C) 2002-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,11 +1,11 @@
 #                                                            -*- C -*-
 # Yacc compatible skeleton for Bison

-# Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2020 Free Software
+# Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software
 # Foundation, Inc.

 m4_pushdef([b4_copyright_years],
-           [1984, 1989-1990, 2000-2015, 2018-2020])
+           [1984, 1989-1990, 2000-2015, 2018-2021])

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -3,7 +3,7 @@
 <!--
    bison.xsl - common templates for Bison XSLT.

-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

    This file is part of Bison, the GNU Compiler Compiler.

@@ -3,7 +3,7 @@
 <!--
    xml2dot.xsl - transform Bison XML Report into DOT.

-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

    This file is part of Bison, the GNU Compiler Compiler.

@@ -3,7 +3,7 @@
 <!--
    xml2text.xsl - transform Bison XML Report into plain text.

-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

    This file is part of Bison, the GNU Compiler Compiler.

@@ -3,7 +3,7 @@
 <!--
    xml2html.xsl - transform Bison XML Report into XHTML.

-    Copyright (C) 2007-2015, 2018-2020 Free Software Foundation, Inc.
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.

    This file is part of Bison, the GNU Compiler Compiler.

@@ -173,7 +173,7 @@
 This manual (@value{UPDATED}) is for GNU Bison (version @value{VERSION}),
 the GNU parser generator.

-Copyright @copyright{} 1988--1993, 1995, 1998--2015, 2018--2020 Free
+Copyright @copyright{} 1988--1993, 1995, 1998--2015, 2018--2021 Free
 Software Foundation, Inc.

@quotation
@@ -1663,7 +1663,7 @@ after @samp{//}.
@example
 /* Parser for rpcalc.   -*- C -*-

-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
   Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.
@@ -2549,7 +2549,7 @@ Here are the C and Bison declarations for the multi-function calculator.
@example
 /* Parser for mfcalc.   -*- C -*-

-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
   Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.
@@ -2678,7 +2678,7 @@ provides for either functions or variables to be placed in the table.
@example
 /* Functions for mfcalc.   -*- C -*-

-   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2020 Free Software
+   Copyright (C) 1988-1993, 1995, 1998-2015, 2018-2021 Free Software
   Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.
@@ -11988,7 +11988,7 @@ generate C++.
@example
 /* Simple variant-based parser.   -*- C++ -*-

-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -13084,7 +13084,7 @@ library components, and the declaration of the parser class.
@example
 /* Driver for calc++.   -*- C++ -*-

-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -13180,7 +13180,7 @@ The implementation of the driver (@file{driver.cc}) is straightforward.
@example
 /* Driver for calc++.   -*- C++ -*-

-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -13247,7 +13247,7 @@ designed the grammar for.
@example
 /* Parser for calc++.   -*- C++ -*-

-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -13459,7 +13459,7 @@ then the parser's to get the set of defined tokens.
@example
 /* Scanner for calc++.   -*- C++ -*-

-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -13555,6 +13555,14 @@ then the parser's to get the set of defined tokens.
 #  pragma GCC diagnostic ignored "-Wsign-conversion"
 # endif
 #endif
+
+// Flex 2.6.4, GCC 9
+// warning: useless cast to type 'int' [-Wuseless-cast]
+// 1361 |   YY_CURRENT_BUFFER_LVALUE->yy_buf_size = (int) (new_size - 2);
+//      |                                                 ^
+#if defined GCC_VERSION && 900 <= GCC_VERSION
+# pragma GCC diagnostic ignored "-Wuseless-cast"
+#endif
 %@}
@end example
@end ignore
@@ -13706,7 +13714,7 @@ The top level file, @file{calc++.cc}, poses no problem.
@example
 /* Main for calc++.   -*- C++ -*-

-   Copyright (C) 2005--2015, 2018--2020 Free Software Foundation, Inc.
+   Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2001-2003, 2005-2015, 2018-2020 Free Software
+## Copyright (C) 2001-2003, 2005-2015, 2018-2021 Free Software
 ## Foundation, Inc.

 ## This program is free software: you can redistribute it and/or modify
@@ -19,7 +19,7 @@
 \def\finalout{\overfullrule=0pt}
 %\finalout

-% Copyright (c) 1998, 2001, 2009--2015, 2018--2020 Free Software
+% Copyright (c) 1998, 2001, 2009--2015, 2018--2021 Free Software
 % Foundation, Inc.
 %
 % This file is part of Bison.
@@ -22,7 +22,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2006, 2009-2015, 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2006, 2009-2015, 2018-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 #! /usr/bin/perl -w

-# Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
+# Copyright (C) 2006, 2008-2015, 2018-2021 Free Software Foundation,
 # Inc.
 #
 # This file is part of Bison, the GNU Compiler Compiler.
@@ -1,4 +1,4 @@
-## Copyright (C) 2006, 2008-2015, 2018-2020 Free Software Foundation,
+## Copyright (C) 2006, 2008-2015, 2018-2021 Free Software Foundation,
 ## Inc.

 ## This program is free software: you can redistribute it and/or modify
@@ -17,7 +17,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -46,7 +46,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -36,7 +36,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+  Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,5 +1,5 @@
 /*
-  Copyright (C) 2008-2015, 2018-2020 Free Software Foundation, Inc.
+  Copyright (C) 2008-2015, 2018-2021 Free Software Foundation, Inc.

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
@@ -81,7 +81,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 This file is part of GNU bison, the GNU Compiler Compiler.

@@ -32,7 +32,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser and scanner for bistromathic.   -*- C -*-

-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -9,7 +9,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2019-2020 Free Software Foundation, Inc.
+Copyright (C) 2019-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2019-2020 Free Software Foundation, Inc.
+# Copyright (C) 2019-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2019-2020 Free Software Foundation, Inc.
+## Copyright (C) 2019-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -11,7 +11,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser for lexcalc.   -*- C -*-

-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 /* Scanner for lexcalc.   -*- C -*-

-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -20,7 +20,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2020 Free Software Foundation, Inc.
+Copyright (C) 2020-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2020 Free Software Foundation, Inc.
+# Copyright (C) 2020-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser and scanner for pushcalc.   -*- C -*-

-   Copyright (C) 2020 Free Software Foundation, Inc.
+   Copyright (C) 2020-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -26,7 +26,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1,4 +1,4 @@
-## Copyright (C) 2019-2020 Free Software Foundation, Inc.
+## Copyright (C) 2019-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser for reccalc.   -*- C -*-

-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Scanner for reccalc.   -*- C -*-

-   Copyright (C) 2019-2020 Free Software Foundation, Inc.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2005-2006, 2008-2015, 2018-2020 Free Software
+## Copyright (C) 2005-2006, 2008-2015, 2018-2021 Free Software
 ## Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2005-2015, 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2005-2015, 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -15,7 +15,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser and scanner for calc in D.   -*- D -*-

-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -3,7 +3,7 @@

 # This file is part of GNU Bison

-# Copyright (C) 1992, 2000-2001, 2005-2006, 2009-2015, 2018-2020 Free
+# Copyright (C) 1992, 2000-2001, 2005-2006, 2009-2015, 2018-2021 Free
 # Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
@@ -19,7 +19,7 @@ fill-column: 76
 ispell-dictionary: "american"
 End:

-Copyright (C) 2018-2020 Free Software Foundation, Inc.
+Copyright (C) 2018-2021 Free Software Foundation, Inc.

 Permission is granted to copy, distribute and/or modify this document
 under the terms of the GNU Free Documentation License, Version 1.3 or
@@ -1,6 +1,6 @@
 #! /bin/sh

-# Copyright (C) 2018-2020 Free Software Foundation, Inc.
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
 #
 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -1,6 +1,6 @@
 /* Parser and scanner for calc in Java.   -*- Java -*-

-   Copyright (C) 2018-2020 Free Software Foundation, Inc.
+   Copyright (C) 2018-2021 Free Software Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

@@ -1,4 +1,4 @@
-## Copyright (C) 2018-2020 Free Software Foundation, Inc.
+## Copyright (C) 2018-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -1,4 +1,4 @@
-## Copyright (C) 2020 Free Software Foundation, Inc.
+## Copyright (C) 2020-2021 Free Software Foundation, Inc.
 ##
 ## This program is free software: you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Akim Demaille	2fac23b9dd	version 3.7.5 * NEWS: Record release date.	2021-01-24 08:30:41 +01:00
Akim Demaille	c22902e360	tables: fix handling for useless tokens In some rare conditions, the generated parser can be wrong when there are useless tokens. Reported by Balázs Scheidler. https://github.com/akimd/bison/issues/72 Balázs managed to prove that the bug was introduced in commit `af1c6f973a` Author: Theophile Ranquet <[email protected]> Date: Tue Nov 13 10:38:49 2012 +0000 tables: use bitsets for a performance boost Suggested by Yuri at <http://lists.gnu.org/archive/html/bison-patches/2012-01/msg00000.html>. The improvement is marginal for most grammars, but notable for large grammars (e.g., PosgreSQL's postgre.y), and very large for the sample.y grammar submitted by Yuri in http://lists.gnu.org/archive/html/bison-patches/2012-01/msg00012.html. Measured with --trace=time -fsyntax-only. parser action tables postgre.y sample.y Before 0,129 (44%) 37,095 (99%) After 0,117 (42%) 5,046 (93%) * src/tables.c (pos): Replace this set of integer coded as an unsorted array of integers with... (pos_set): this bitset. which was implemented long ago, but that I installed only recently (March 2019), first published in v3.3.90. That patch introduces a bitset to represent a set of integers. It managed negative integers by using a (fixed) base (the smallest integer to represent). It avoided negative accesses into the bitset by ignoring integers smaller than the base, under the asumption that these cases correspond to useless tokens that are ignored anyway. While it turns out to be true for all the test cases in the test suite (!), Balázs' use case demonstrates that it is not always the case. So we need to be able to accept negative integers that are smaller than the current base. "Amusingly" enough, the aforementioned patch was visibly unsure about itself: /* Store PLACE into POS_SET. PLACE might not belong to the set of possible values for instance with useless tokens. It would be more satisfying to eliminate the need for this 'if'. / This commit needs several improvements in the future: - support from bitset for bit assignment and shifts - amortized resizing of pos_set - test cases src/tables.c (pos_set_base, pos_set_dump, pos_set_set, pos_set_test): New. Use them instead of using bitset_set and bitset_test directly.	2021-01-24 08:28:45 +01:00
Vincent ImbimboandAkim Demaille	2c294c1325	cex: fix state-item pruning There were several bugs in pruning that would leave the state-item graph in an inconsistent state which could cause crashes later on: - Pruning now happens in one pass instead of two. - Disabled state-items no longer prune the state-items they transition to if that state-item has other states that transition to it. - State-items that transition to disabled state-items are always pruned even if they have productions. Reported by Michal Bartkowiak <[email protected]> https://lists.gnu.org/r/bug-bison/2021-01/msg00000.html and Zartaj Majeed https://github.com/akimd/bison/issues/71 * src/state-item.c (prune_forward, prune_backward): Fuse into... (prune_state_item): this. Adjust callers.	2021-01-24 08:24:56 +01:00
Akim Demaille	236b85dd28	package: pacify syntax-check * cfg.mk: Currently we cannot update gnulib because of portability issues with ancient versions of clang (https://lists.gnu.org/r/bug-gnulib/2021-01/msg00241.html). So skip the check about copyright date for gnulib.	2021-01-23 15:08:48 +01:00
Akim Demaille	4109d56aa9	news: update	2021-01-23 15:02:49 +01:00
Akim Demaille	003ca0498d	package: bump copyrights to 2021 Run 'make update-copyright'.	2021-01-23 15:02:49 +01:00
Akim Demaille	3abad26a2d	%merge: associate it to its first definition, not the latest Currently each time we meet %merge we record this location as the defining location (and symbol). Instead, record the first definition. In the generated code we go from yy0->A = merge (yy0, yy1); to yy0->S = merge (yy0, yy1); where S was indeed the first symbol, and in the diagnostics we go from glr-regr18.y:30.18-24: error: result type clash on merge function 'merge': <type2> != <type1> 30 \| sym2: sym3 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ glr-regr18.y:29.18-24: note: previous declaration 29 \| sym1: sym2 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ glr-regr18.y:31.13-19: error: result type clash on merge function 'merge': <type3> != <type2> 31 \| sym3: %merge<merge> { $$ = 0; } ; \| ^~~~~~~ glr-regr18.y:30.18-24: note: previous declaration 30 \| sym2: sym3 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ to glr-regr18.y:30.18-24: error: result type clash on merge function 'merge': <type2> != <type1> 30 \| sym2: sym3 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ glr-regr18.y:29.18-24: note: previous declaration 29 \| sym1: sym2 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ glr-regr18.y:31.13-19: error: result type clash on merge function 'merge': <type3> != <type1> 31 \| sym3: %merge<merge> { $$ = 0; } ; \| ^~~~~~~ glr-regr18.y:29.18-24: note: previous declaration 29 \| sym1: sym2 %merge<merge> { $$ = $1; } ; \| ^~~~~~~ where both duplicates are reported against definition 1, rather than using definition 1 as a reference when diagnosing about definition 2, and then 2 as a reference for 3. * src/reader.c (record_merge_function_type): Keep the first definition. * tests/glr-regression.at: Adjust.	2021-01-23 15:02:49 +01:00
Akim Demaille	1bac4ecc44	%merge: fix compatibility with api.value.type=union Reported by Jot Dot. https://lists.gnu.org/r/help-bison/2020-12/msg00014.html * data/skeletons/glr.c, data/skeletons/glr2.cc (b4_call_merger): Use the symbol's slot, not its type. * examples/c/glr/c++-types.y: Use explicit per-symbol typing together with api.value.type=union. (yylex): Use yytoken_kind_t.	2021-01-23 15:02:49 +01:00
Akim Demaille	84b00b6bf0	%merge: delegate the generation of calls to mergers to m4 Don't generate C code from bison, leave that to the skeletons. * src/output.c (merger_output): Emit invocations to b4_call_merger. * data/skeletons/glr.c (b4_call_merger): New.	2021-01-23 15:02:49 +01:00
Akim Demaille	a26f7cf98f	%merge: let mergers record a typing-symbol, rather than a type Symbols are richer than types, and in M4 it is my simpler (and more common) to deal with symbols rather than types. So let's associate mergers to a symbol rather than a type name. * src/reader.h (merger_list): Replace the 'type' member by a symbol member. * src/reader.c (record_merge_function_type): Take a symbol as argument, rather than a type name. * src/output.c (merger_output): Adjust.	2021-01-23 10:43:25 +01:00
Akim Demaille	0317055bb0	%merge: clearer tests on diagnostics * tests/glr-regression.at: Use caret errors.	2021-01-23 10:43:25 +01:00
Akim Demaille	c73dcd6958	skeletons: introduce "slot"s for symbols Extracted from `d9cf99b6a5`, in the master branch. * data/skeletons/bison.m4 (b4_symbol_slot): New, with safer semantics than type and type_tag.	2021-01-23 10:43:25 +01:00
Akim Demaille	11f6839645	style: YYUSE is private, make it YY_USE This macro is not exposed to users, make start it with 'YY_'. * data/skeletons/bison.m4, data/skeletons/c.m4, data/skeletons/glr.c, * data/skeletons/glr.cc, data/skeletons/lalr1.cc, * src/parse-gram.c, tests/actions.at, tests/c++.at, tests/headers.at, * tests/local.at (YYUSE): Rename as... (YY_USE): this.	2021-01-23 10:43:25 +01:00
Akim Demaille	4910c02579	package: codespell * src/parse-gram.y: Fix spelling.	2021-01-23 10:43:25 +01:00
Akim Demaille	83bc889536	cex: fix traces: fix display of disabled items The display of disabled state items is incorrect. The item is stuttered, and lacks on end-of-line. From State 7: 1 exp: exp • "⊕" exp -> 1 exp: exp "⊕" • exp <- 1 exp: • exp "⊕" exp 2 exp: exp • "+" exp 2 exp: exp • "+" exp DISABLED 2 exp: exp "+" exp • <- 2 exp: exp "+" • exp 3 exp: exp • "+" exp 3 exp: exp • "+" exp DISABLED 3 exp: exp "+" exp • <- 3 exp: exp "+" • exp to State 7: 1 exp: exp • "⊕" exp -> 1 exp: exp "⊕" • exp <- 1 exp: • exp "⊕" exp 2 exp: exp • "+" exp DISABLED 2 exp: exp "+" exp • <- 2 exp: exp "+" • exp 3 exp: exp • "+" exp DISABLED 3 exp: exp "+" exp • <- 3 exp: exp "+" • exp * src/state-item.c (state_items_report): Don't issue disabled items twice, and issue two '\n' at their end. * tests/conflicts.at: Check it.	2021-01-23 10:43:04 +01:00
Akim Demaille	2f554e6260	cex: fix traces: add missing end-of-lines In `430ca0fc63`, I completely forgot that `puts` adds a `\n`. * src/lssi.c, src/state-item.c: Restore missing end-of-lines in the output.	2021-01-23 10:42:52 +01:00
Akim Demaille	7a31b6bb7f	cex: add support for $TIME_LIMIT * src/counterexample.c (TIME_LIMIT): Replace with... (time_limit): this. (counterexample_init): Check $TIME_LIMIT. * src/scan-gram.l: Reorder includes.	2021-01-23 09:40:32 +01:00
Akim Demaille	8320691a63	cex: send traces to stderr, not stdout When comparing traces from different machines, the mixture of stdout/stderr in the output are making things uselessly difficult. * src/lssi.c, src/state-item.c: Output debug traces on stderr.	2021-01-23 09:39:27 +01:00
Akim Demaille	3b03c62e49	c++: I'm tired of Flex's warnings * doc/bison.texi: Disable another warning I'm tired to see. New releases would be most welcome.	2021-01-23 09:39:15 +01:00
Akim Demaille	a700a13822	glr.cc: don't "leak" yyparse When using glr.cc, the C function yyparse is an internal detail that should not be exposed. Users might call it by accident (I did). * data/skeletons/glr.c (yyparse): When used for glr.cc, rename as yy_parse_impl. * data/skeletons/glr.cc: Adjust.	2021-01-23 09:37:05 +01:00
Akim Demaille	1d3df34671	tables: avoid warnings and save bits The yydefgoto table uses -1 as an invalid for an impossible case (we never use yydefgoto[0], since it corresponds to the reduction to $accept, which never happens). Since yydefgoto is a table of state numbers, this -1 forces a signed type uselessly, which (1) might trigger compiler warnings when storing a value from yydefgoto into a state number (nonnegative), and (2) wastes bits which might result in using a int16 where a uint8 suffices. Reported by Jot Dot <[email protected]>. https://lists.gnu.org/r/bug-bison/2020-11/msg00027.html * src/tables.c (default_goto): Use 0 rather than -1 as invalid value. * tests/regression.at: Adjust.	2021-01-23 09:36:24 +01:00
Akim Demaille	89d2b69c1b	c++: use noexcept where appropriate Reported by Don Macpherson. https://github.com/akimd/bison/issues/63 https://github.com/akimd/bison/issues/64 * data/skeletons/c++.m4, data/skeletons/lalr1.cc: here.	2021-01-23 09:28:01 +01:00
Martin RehakandAkim Demaille	1e0b087244	examples: avoid "unbound variable" errors When the shell option `nounset` is set, we may get "unbound variable" errors. https://lists.gnu.org/r/bug-bison/2020-11/msg00013.html * examples/test (diff_opts): Be sure to initialize it.	2021-01-23 09:27:30 +01:00
Akim Demaille	4744faf205	autoconf: update	2021-01-23 09:24:11 +01:00
Akim Demaille	1ac973aa56	c: adjust _Noreturn to pedantic clang Reported by Joe Nelson <[email protected]>. https://lists.gnu.org/r/help-bison/2021-01/msg00004.html Fixed by Paul Eggert in gnulib. https://lists.gnu.org/r/bug-gnulib/2021-01/msg00156.html * data/skeletons/c.m4 (b4_attribute_define): Adjust _Noreturn to pedantic clang.	2021-01-23 09:24:01 +01:00
Paul Eggert	8358090292	c: port to HP-UX 11.23 Problem reported by Albert Chin in: https://lists.gnu.org/r/bug-bison/2021-01/msg00029.html * data/skeletons/c.m4 (b4_c99_int_type_define): Work around HP-UX bug.	2021-01-21 11:45:34 -08:00
Akim Demaille	0364dbacbf	maint: post-release administrivia * NEWS: Add header line for next release. * .prev-version: Record previous version. * cfg.mk (old_NEWS_hash): Auto-update.	2020-11-14 12:26:42 +01:00
@@ -1 +1 @@
 .7.3
 .7.4