* build-aux/cross-options.pl: As in --help output, write optional
arguments as [=ARG] not =[ARG].
* doc/bison.texinfo (Bison Options): Add -W/--warnings argument.
* build-aux/cross-options.pl: The argument ends at the first
space, not the first non-symbol character.
Use @var for each word appearing the argument description.
(cherry picked from commit 74eae918c3)
-g and -x take optional arguments, just like their long options.
* build-aux/cross-options.pl: Use /x to make the regexp easier to
understand.
Fix the handling of $opt which resulted in all the argument to be
considered as optional.
* NEWS (2.3a+): Mention.
* doc/bison.texinfo (Bison Options): Add an entry.
* src/files.c (compute_output_file_names): Don't override
spec_verbose_file if already set.
* src/getargs.c (usage): Document --report-file.
(REPORT_FILE_OPTION): New anonymous enum member.
(long_options): Add entry for it.
(getargs): Add case for it setting spec_verbose_file.
* build-aux/cross-options.pl: Don't record a short option just because
there's an arg.
* doc/.cvsignore: Add yacc.1.
