build: update gnulib submodule to latest

Problem reported by James K. Lowden in:
https://lists.gnu.org/r/bison-patches/2026-07/msg00000.html
* data/skeletons/yacc.c: In C++, check that YYLTYPE is
trivially copyable if this is not already known.
But skip the check in older compilers.

.gitignore

@@ -1,10 +1,19 @@
+*.a
+*.bak
+*.diff
+*.exe
 *.log
 *.o
+*.orig
+*.out
+*.output
 *.pdf
+*.rej
 *.stamp
+*.tmp
 *.trs
 *~
-.deps
+.deps/
 .dirstamp
 /*.cache
 /*.flc
@@ -20,11 +29,9 @@
 /Makefile.in
 /README-release
 /_*
-/a.exe
-/a.out
 /aclocal.m4
-/b.out
 /bison-*
+/build-aux/move-if-change
 /conf[0-9]*
 /confdefs*
 /config.log

NEWS

@@ -8,6 +8,9 @@ GNU Bison NEWS
 
   The C++ skeletons now expose copy and move operators for symbols.
 
+  The default (C) skeleton now supports user-defined semantic and location
+  types that are trivially copyable in C++.
+
   Fixed portability issues of the test suite on Solaris.
 
   Fixed spurious warnings about input containing `m4_` or `b4_`.

bootstrap

@@ -3,7 +3,7 @@
 
 scriptversion=2025-06-10.02; # UTC
 
-# Copyright (C) 2003-2025 Free Software Foundation, Inc.
+# Copyright (C) 2003-2026 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

bootstrap-funclib.sh

@@ -1,6 +1,6 @@
 # A library of shell functions for autopull.sh, autogen.sh, and bootstrap.
 
-scriptlibversion=2025-06-10.02; # UTC
+scriptlibversion=2025-12-04.19; # UTC
 
 # Copyright (C) 2003-2026 Free Software Foundation, Inc.
 #
@@ -35,7 +35,7 @@ export LC_ALL
 # Honor $PERL, but work even if there is none.
 PERL="${PERL-perl}"
 
-default_gnulib_url=https://git.savannah.gnu.org/git/gnulib.git
+default_gnulib_url=https://https.git.savannah.gnu.org/git/gnulib.git
 
 # Copyright year, for the --version output.
 copyright_year=`echo "$scriptlibversion" | sed -e 's/[^0-9].*//'`
@@ -824,7 +824,8 @@ autopull()
     elif check_exists git-merge-changelog; then
       echo "$0: initializing git-merge-changelog driver"
       git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
-      git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
+      git config merge.merge-changelog.driver \
+          'git-merge-changelog %O %A %B "%Y"'
     else
       echo "$0: consider installing git-merge-changelog from gnulib"
     fi

bootstrap.conf

@@ -34,6 +34,7 @@ gnulib_modules='
   libtextstyle-optional
   linked-list
   malloc-gnu
+  mcel-prefer
   mbfile mbswidth
   obstack
   obstack-printf
@@ -80,7 +81,16 @@ XGETTEXT_OPTIONS_RUNTIME=$XGETTEXT_OPTIONS'\\\
  --keyword=YY_ \\\
 '
 
-gnulib_tool_option_extras='--symlink --conditional-dependencies --makefile-name=gnulib.mk --automake-subdir --automake-subdir-tests --po-base=gnulib-po --po-domain=bison'
+gnulib_tool_option_extras="\
+ --automake-subdir\
+ --automake-subdir-tests\
+ --avoid=mbiterf\
+ --conditional-dependencies\
+ --makefile-name=gnulib.mk\
+ --po-base=gnulib-po\
+ --po-domain=bison\
+ --symlink\
+"
 
 gnulib_extra_files="$gnulib_extra_files build-aux/move-if-change"
 

build-aux/.gitignore

@@ -3,7 +3,6 @@
 /config.guess
 /config.libpath
 /config.rpath
-/config.rpath~
 /config.sub
 /depcomp
 /do-release-commit-and-tag

data/skeletons/glr.c

@@ -307,6 +307,10 @@ static YYLTYPE yyloc_default][]b4_yyloc_default;])[
 # include <setjmp.h>
 # define YYJMP_BUF jmp_buf
 # define YYSETJMP(Env) setjmp (Env)
+/* Pacify GCC <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21161>.  */
+#if defined __GNUC__ && 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
+# pragma GCC diagnostic ignored "-Wclobbered"
+#endif
 /* Pacify Clang and ICC.  */
 # define YYLONGJMP(Env, Val)                    \
  do {                                           \

data/skeletons/glr2.cc

@@ -483,6 +483,10 @@ namespace
 # include <setjmp.h>
 # define YYJMP_BUF jmp_buf
 # define YYSETJMP(Env) setjmp (Env)
+/* Pacify GCC <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21161>.  */
+#if defined __GNUC__ && 4 < __GNUC__ + (6 <= __GNUC_MINOR__)
+# pragma GCC diagnostic ignored "-Wclobbered"
+#endif
 /* Pacify Clang and ICC.  */
 # define YYLONGJMP(Env, Val)                    \
  do {                                           \

data/skeletons/lalr1.cc

@@ -843,6 +843,7 @@ m4_if(b4_prefix, [yy], [],
   int
   ]b4_parser_class[::parse ()
   {
+    YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
     int yyn;
     /// Length of the RHS of the rule being reduced.
     int yylen = 0;
@@ -987,7 +988,6 @@ b4_dollar_popdef])[]dnl
   yyreduce:
     yylen = yyr2_[yyn];
     {
-      YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
       stack_symbol_type yylhs;
       yylhs.state = yy_lr_goto_state_ (yystack_[yylen].state, yyr1_[yyn]);]b4_variant_if([[
       /* Variants are always initialized to an empty instance of the
@@ -1040,7 +1040,6 @@ b4_dollar_popdef])[]dnl
 
       // Shift the result of the reduction.
       yypush_ (YY_NULLPTR, YY_MOVE (yylhs));
-      YY_IGNORE_MAYBE_UNINITIALIZED_END
     }
     goto yynewstate;
 
@@ -1181,6 +1180,7 @@ b4_dollar_popdef])[]dnl
       }
 
     return yyresult;
+    YY_IGNORE_MAYBE_UNINITIALIZED_END
   }
 #if YY_EXCEPTIONS
     catch (...)

data/skeletons/yacc.c

@@ -581,10 +581,27 @@ void free (void *); /* INFRINGES ON USER NAME SPACE */
 # define YYCOPY_NEEDED 1]])[
 #endif /* ]b4_lac_if([[1]], [b4_parse_error_case([simple], [[!defined yyoverflow]], [[1]])])[ */
 
-#if (! defined yyoverflow \
-     && (! defined __cplusplus \
-         || (]b4_locations_if([[defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL \
-             && ]])[defined ]b4_api_PREFIX[STYPE_IS_TRIVIAL && ]b4_api_PREFIX[STYPE_IS_TRIVIAL)))
+#ifndef yyoverflow
+/* In C++, ]b4_api_PREFIX[STYPE must be trivially copyable.
+   If ]b4_api_PREFIX[STYPE_IS_TRIVIAL, this is already known.
+   Otherwise check this if easy, as in newer C++ compilers.]b4_locations_if([[
+   Likewise for ]b4_api_PREFIX[LTYPE.]])[  */
+# if (! (]b4_locations_if([[defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL \
+         && ]])[defined ]b4_api_PREFIX[STYPE_IS_TRIVIAL && ]b4_api_PREFIX[STYPE_IS_TRIVIAL) \
+      && defined __cplusplus && 201103 <= __cplusplus \
+      && !(defined _GLIBCXX_RELEASE \
+           ? _GLIBCXX_RELEASE < 5 \
+           : defined __GLIBCXX__) \
+      && defined __has_include)
+#  if __has_include (<type_traits>)
+#   include <type_traits>
+]b4_locations_if(
+[[static_assert (std::is_trivially_copyable<]b4_api_PREFIX[LTYPE>::value,
+               "Bison error: api.location.type is not trivially copyable");
+]])[static_assert (std::is_trivially_copyable<]b4_api_PREFIX[STYPE>::value,
+               "Bison error: api.value.type is not trivially copyable");
+#  endif
+# endif
 
 /* A type that is properly aligned for any stack member.  */
 union yyalloc

doc/.gitignore

@@ -8,27 +8,18 @@
 #/bison.cp
 #/bison.cps
 #/bison.toc
-
-/*~
-/.dirstamp
+*.dvi
+*.ps
 /bison.1
-/bison.dvi
 /bison.help
 /bison.html
 /bison.info
-/bison.info.bak
-/bison.log
-/bison.pdf
-/bison.ps
 /cross-options.texi
 /figs/*.eps
 /figs/*.svg
 /gendocs_template
 /gendocs_template_min
 /gpl-3.0.texi
-/refcard.dvi
-/refcard.log
-/refcard.ps
 /relocatable.texi
 /stamp-vti
 /version.texi

examples/.gitignore

@@ -0,0 +1,13 @@
+*.c
+*.cc
+*.class
+*.h
+*.hh
+!/c++/glr/ast.hh
+*.java
+*.ll
+/c/bistromathic/bistromathic
+/c/calc/calc
+/c/glr/c++-types
+/c/lexcalc/lexcalc
+/c/pushcalc/calc

examples/c++/.gitignore

@@ -1 +1,5 @@
+/glr/c++-types
+/simple
 /simple.yy
+/variant
+/variant-11

examples/c++/calc++/.gitignore

@@ -1,19 +1,2 @@
-/*.o
-/*.tmp
-/.deps
 /calc++
-/calc++.cc
-/calc++.exe
-/calc.stamp
-/driver.cc
-/driver.hh
-/location.hh
-/parser.cc
-/parser.hh
-/parser.output
-/parser.stamp
 /parser.yy
-/position.hh
-/scanner.cc
-/scanner.ll
-/stack.hh

examples/c/mfcalc/.gitignore

@@ -1,11 +1,2 @@
-/*.o
-/*.tmp
-/.deps
-/calc.h
 /mfcalc
-/mfcalc.c
-/mfcalc.exe
-/mfcalc.h
-/mfcalc.output
-/mfcalc.stamp
 /mfcalc.y

examples/c/reccalc/.gitignore

@@ -1,2 +1 @@
-/scan.c
-/scan.h
+/reccalc

examples/c/rpcalc/.gitignore

@@ -1,7 +1,2 @@
-/calc.h
 /rpcalc
-/rpcalc.c
-/rpcalc.h
-/rpcalc.output
-/rpcalc.stamp
 /rpcalc.y

gnulib-po/.gitignore

@@ -17,5 +17,4 @@
 /quot.sed
 /remove-potcdate.sed
 /remove-potcdate.sin
-/remove-potcdate.sin~
 /stamp-po

lib/.gitignore

@@ -1,9 +1,3 @@
-/*.a
-/*.bak
-/*.o
-/*~
-/.deps
-/.dirstamp
 /_Noreturn.h
 /access.c
 /alloca.h
@@ -27,8 +21,6 @@
 /basename.c
 /binary-io.c
 /binary-io.h
-/bitrotate.c
-/bitrotate.h
 /bitset.c
 /bitset.h
 /bitset/
@@ -39,7 +31,6 @@
 /c-ctype.h
 /c-strcase.h
 /c-strcasecmp.c
-/c-strcaseeq.h
 /c-strncasecmp.c
 /c-strtod.c
 /c-strtod.h
@@ -226,10 +217,6 @@
 /iconv_open-aix.h
 /iconv_open-hpux.gperf
 /iconv_open-hpux.h
-/iconv_open-irix.gperf
-/iconv_open-irix.h
-/iconv_open-osf.gperf
-/iconv_open-osf.h
 /iconv_open-solaris.gperf
 /iconv_open-solaris.h
 /iconv_open-zos.gperf
@@ -243,6 +230,7 @@
 /intprops.h
 /inttypes.h
 /inttypes.in.h
+/isinf.c
 /isnan.c
 /isnand-nolibm.h
 /isnand.c
@@ -250,6 +238,8 @@
 /isnanf.c
 /isnanl-nolibm.h
 /isnanl.c
+/issymlink.c
+/issymlink.h
 /iswblank.c
 /iswdigit.c
 /iswpunct.c
@@ -279,8 +269,6 @@
 /mbchar.h
 /mbfile.c
 /mbfile.h
-/mbiterf.c
-/mbiterf.h
 /mbrtoc32.c
 /mbrtowc-impl-utf8.h
 /mbrtowc-impl.h
@@ -292,8 +280,11 @@
 /mbszero.c
 /mbtowc-lock.c
 /mbtowc-lock.h
+/mcel.c
+/mcel.h
 /memchr.c
 /memchr.valgrind
+/memeq.c
 /mempcpy.c
 /memrchr.c
 /minmax.h
@@ -337,6 +328,7 @@
 /pthread-once.c
 /pthread.h
 /pthread.in.h
+/pthread_sigmask.c
 /quote.h
 /quotearg.c
 /quotearg.h
@@ -370,6 +362,8 @@
 /sig-handler.c
 /sig-handler.h
 /sigaction.c
+/sigdelay.c
+/sigdelay.h
 /signal.h
 /signal.in.h
 /signbitd.c
@@ -404,14 +398,21 @@
 /stat-w32.c
 /stat-w32.h
 /stat.c
+/stdbit.h
+/stdbit.in.h
 /stdbool.h
+/stdc_rotate_left.c
+/stdc_rotate_right.c
 /stdckdint.h
 /stdckdint.in.h
+/stdcountof.h
+/stdcountof.in.h
 /stddef.h
 /stddef.in.h
 /stdint.h
 /stdint.in.h
 /stdio--.h
+/stdio-consolesafe.c
 /stdio-impl.h
 /stdio-read.c
 /stdio-safer.h
@@ -426,7 +427,8 @@
 /strchrnul.c
 /strchrnul.valgrind
 /strdup.c
-/streq.h
+/streq-opt.h
+/streq.c
 /strerror-override.c
 /strerror-override.h
 /strerror.c
@@ -438,6 +440,7 @@
 /stripslash.c
 /strndup.c
 /strnlen.c
+/strnul.c
 /strtod.c
 /strverscmp.c
 /sys/
@@ -452,6 +455,10 @@
 /termios.in.h
 /textstyle.h
 /textstyle.in.h
+/thread-creators.gperf
+/thread-creators.h
+/thread-optim-proto.c
+/thread-optim.c
 /thread-optim.h
 /time.h
 /time.in.h
@@ -520,6 +527,8 @@
 /windows-rwlock.h
 /windows-spawn.c
 /windows-spawn.h
+/windows-spin.c
+/windows-spin.h
 /windows-tls.c
 /windows-tls.h
 /xalloc-die.c

m4/.gitignore

@@ -1,4 +1,3 @@
-/*~
 /00gnulib.m4
 /__inline.m4
 /absolute-header.m4
@@ -15,6 +14,7 @@
 /calloc.m4
 /canonicalize.m4
 /chdir-long.m4
+/check-math-lib.m4
 /clock_time.m4
 /close.m4
 /closedir.m4
@@ -39,7 +39,6 @@
 /extensions-aix.m4
 /extensions.m4
 /extern-inline.m4
-/extern-inline.m4~
 /fatal-signal.m4
 /fchdir.m4
 /fclose.m4
@@ -76,6 +75,7 @@
 /getprogname.m4
 /getrusage.m4
 /gettext.m4
+/gettext_h.m4
 /gettime.m4
 /gettimeofday.m4
 /glibc2.m4
@@ -102,6 +102,7 @@
 /inttypes-pri.m4
 /inttypes.m4
 /inttypes_h.m4
+/isinf.m4
 /isnan.m4
 /isnand.m4
 /isnanf.m4
@@ -121,6 +122,7 @@
 /lib-ld.m4
 /lib-link.m4
 /lib-prefix.m4
+/libdl.m4
 /libtextstyle-optional.m4
 /libtextstyle.m4
 /libunistring-base.m4
@@ -140,13 +142,13 @@
 /math_h.m4
 /mbchar.m4
 /mbfile.m4
-/mbiter.m4
 /mbrtoc32.m4
 /mbrtowc.m4
 /mbsinit.m4
 /mbstate_t.m4
 /mbswidth.m4
 /memchr.m4
+/memeq.m4
 /mempcpy.m4
 /memrchr.m4
 /minmax.m4
@@ -185,6 +187,7 @@
 /pthread-spin.m4
 /pthread_h.m4
 /pthread_rwlock_rdlock.m4
+/pthread_sigmask.m4
 /quote.m4
 /quotearg.m4
 /raise.m4
@@ -220,7 +223,9 @@
 /stat.m4
 /std-gnu11.m4
 /stdalign.m4
+/stdbit_h.m4
 /stdckdint_h.m4
+/stdcountof_h.m4
 /stddef_h.m4
 /stdint.m4
 /stdint_h.m4
@@ -230,6 +235,7 @@
 /stpncpy.m4
 /strchrnul.m4
 /strdup.m4
+/streq.m4
 /strerror.m4
 /strerror_r.m4
 /string_h.m4

po/.gitignore

@@ -1,6 +1,5 @@
 /*.gmo
 /*.po
-/*~
 /.reference
 /LINGUAS
 /Makefile

runtime-po/.gitignore

@@ -1,6 +1,5 @@
 /*.gmo
 /*.po
-/*~
 /.reference
 /LINGUAS
 /Makefile

src/.gitignore

@@ -1,9 +1,4 @@
 /*.flc
-/*.log
-/*.o
-/*.output
-/.deps
-/.dirstamp
 /bison
 /bison.exe
 /scan-code.c

src/muscle-tab.c

@@ -193,7 +193,7 @@ muscle_grow (const char *key, const char *val,
     obstack_sgrow (&muscle_obstack, terminator);
 
   {
-    char const *new_val = obstack_finish0 (&muscle_obstack);
+    char *new_val = obstack_finish0 (&muscle_obstack);
     entry->value = entry->storage = xstrdup (new_val);
     obstack_free (&muscle_obstack, new_val);
   }
@@ -211,7 +211,7 @@ muscle_syncline_grow (char const *key, location loc)
   obstack_quote (&muscle_obstack,
                  quotearg_style (c_quoting_style, map_file_name (loc.start.file)));
   obstack_sgrow (&muscle_obstack, ")dnl\n[");
-  char const *extension = obstack_finish0 (&muscle_obstack);
+  char *extension = obstack_finish0 (&muscle_obstack);
   muscle_grow (key, extension, "", "");
   obstack_free (&muscle_obstack, extension);
 }
@@ -239,7 +239,7 @@ muscle_pair_list_grow (const char *muscle,
   obstack_sgrow (&muscle_obstack, ", ");
   obstack_quote (&muscle_obstack, a2);
   obstack_sgrow (&muscle_obstack, "]");
-  char const *pair = obstack_finish0 (&muscle_obstack);
+  char *pair = obstack_finish0 (&muscle_obstack);
   muscle_grow (muscle, pair, ",\n", "");
   obstack_free (&muscle_obstack, pair);
 }
@@ -275,7 +275,7 @@ muscle_boundary_grow (char const *key, boundary bound)
   obstack_sgrow  (&muscle_obstack, "[[");
   obstack_escape (&muscle_obstack, bound.file);
   obstack_printf (&muscle_obstack, ":%d.%d@@%d]]", bound.line, bound.column, bound.byte);
-  char const *extension = obstack_finish0 (&muscle_obstack);
+  char *extension = obstack_finish0 (&muscle_obstack);
   muscle_grow (key, extension, "", "");
   obstack_free (&muscle_obstack, extension);
 }
@@ -326,7 +326,7 @@ string_decode (char const *key)
           break;
       }
   } while (*value++);
-  char const *value_decoded = obstack_finish (&muscle_obstack);
+  char *value_decoded = obstack_finish (&muscle_obstack);
   char *res = xstrdup (value_decoded);
   obstack_free (&muscle_obstack, value_decoded);
   return res;
@@ -407,16 +407,15 @@ define_directive (char const *assignment,
                   muscle_kind kind,
                   char const *value)
 {
-  char *eq = strchr (assignment, '=');
   char const *fmt
-    = eq || !value || !*value ? "%%define %s"
+    = strchr (assignment, '=') || !value || !*value ? "%%define %s"
     : kind == muscle_code     ? "%%define %s {%s}"
     : kind == muscle_string   ? "%%define %s \"%s\""
     :                           "%%define %s %s";
   char *res = xmalloc (strlen (fmt) + strlen (assignment)
                        + (value ? strlen (value) : 0));
   sprintf (res, fmt, assignment, value);
-  eq = strchr (res, '=');
+  char *eq = strchr (res, '=');
   if (eq)
     *eq = eq[1] ? ' ' : '\0';
   return res;

tests/.gitignore

@@ -1,4 +1,3 @@
-/*.output
 /atconfig
 /atlocal
 /bison