Share options between info and man page

I'd like to put an updated patch for both gdb.texinfo and texi2pod.pl,
plus the new comparing result.

etc/ChangeLog:

        * texi2pod.pl (postprocess): Move command process for '@sc' to the
        front of '@dfn'.  Add a new command process for '@t{...}', just print
        the content.

gdb/doc/ChangeLog:

        * gdb.texinfo (Man Pages): Remove the content of man OPTIONS
gdb, add
        a cross reference to 'Invoking GDB'.
        (Invoking GDB): Share the option sub-sections with man OPTIONS
gdb,
        move the uniqe part of man here.  To display correrctly in man
page,
        change '@xref' after a comma to 'see @ref', and change '@table
@code'
        to '@table @env'.

Best regards,
Mingjie
27c27
<        You can use GDB to debug programs written in C, C@t{++}, Fortran and Modula-2.
---
>        You can use GDB to debug programs written in C, C++, Fortran and Modula-2.
84,87c84,93
<        Any arguments other than options specify an executable file and core file (or process ID); that is, the first argument encountered with no associated option flag is equivalent to
<        a -se option, and the second, if any, is equivalent to a -c option if it's the name of a file.  Many options have both long and short forms; both are shown here.  The long forms
<        are also recognized if you truncate them, so long as enough of the option is present to be unambiguous.  (If you prefer, you can flag option arguments with + rather than -, though
<        we illustrate the more usual convention.)
---
>        When GDB starts, it reads any arguments other than options as specifying an executable file and core file (or process ID).  This is the same as if the arguments were specified by
>        the -se and -c (or -p) options respectively.  (GDB reads the first argument that does not have an associated option flag as equivalent to the -se option followed by that argument;
>        and the second argument that does not have an associated option flag, if any, as equivalent to the -c/-p option followed by that argument.)  If the second argument begins with a
>        decimal digit, GDB will first attempt to attach to it as a process, and if that fails, attempt to open it as a corefile.  If you have a corefile whose name begins with a digit,
>        you can prevent GDB from treating it as a pid by prefixing it with ./, e.g. ./12345.
> 
>        If GDB has not been configured to included core file support, such as for most embedded targets, then it will complain about a second argument and ignore it.
> 
>        Many options have both long and short forms; both are shown in the following list.  GDB also recognizes the long forms if you truncate them, so long as enough of the option is
>        present to be unambiguous.  (If you prefer, you can flag option arguments with -- rather than -, though we illustrate the more usual convention.)
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<        -symbols=file
---
>        -symbols file
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<        -write
<            Enable writing into executable and core files.
< 
<        -exec=file
---
>        -exec file
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<        -se=file
---
>        -se file
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<        -core=file
---
>        -core file
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<        -command=file
---
>        -pid number
>        -p number
>            Connect to process ID number, as with the "attach" command.
> 
>        -command file
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<            Execute GDB commands from file file.
---
>            Execute commands from file file.  The contents of this file is evaluated exactly as the "source" command would.
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>        -eval-command command
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<            Execute given GDB command.
---
>            Execute a single GDB command.
> 
>            This option may be used multiple times to call multiple commands.  It may also be interleaved with -command as required.
> 
>                    gdb -ex 'target sim' -ex 'load' \
>                       -x setbreakpoints -ex 'run' a.out
> 
>        -init-command file
>        -ix file
>            Execute commands from file file before loading the inferior (but after loading gdbinit files).
> 
>        -init-eval-command command
>        -iex command
>            Execute a single GDB command before loading the inferior (but after loading gdbinit files).
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<        -directory=directory
---
>        -directory directory
121c142
<            Add directory to the path to search for source files.
---
>            Add directory to the path to search for source and script files.
123c144,149
<        -nh Do not execute commands from ~/.gdbinit.
---
>        -r
>        -readnow
>            Read each symbol file's entire symbol table immediately, rather than the default, which is to read it incrementally as it is needed.  This makes startup slower, but makes
>            future operations faster.
> 
>        You can run GDB in various alternative modes---for example, in batch mode or quiet mode.
126c152,167
<        -n  Do not execute commands from any .gdbinit initialization files.
---
>        -n  Do not execute commands found in any initialization file.  There are three init files, loaded in the following order:
> 
>            "system.gdbinit"
>                This is the system-wide init file.  Its location is specified with the "--with-system-gdbinit" configure option.  It is loaded first when GDB starts, before command line
>                options have been processed.
> 
>            "~/.gdbinit"
>                This is the init file in your home directory.  It is loaded next, after system.gdbinit, and before command options have been processed.
> 
>            "./.gdbinit"
>                This is the init file in the current directory.  It is loaded last, after command line options other than "-x" and "-ex" have been processed.  Command line options "-x"
>                and "-ex" are processed last, after ./.gdbinit has been loaded.
> 
>            For further documentation on startup processing, see Startup.  For documentation on how to write command files, see Command Files,,Command Files.
> 
>        -nh Do not execute commands found in ~/.gdbinit, the init file in your home directory.
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>        -silent
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<            Run in batch mode.  Exit with status 0 after processing all the command files specified with -x (and .gdbinit, if not inhibited).  Exit with nonzero status if an error occurs
<            in executing the GDB commands in the command files.
---
>            Run in batch mode.  Exit with status 0 after processing all the command files specified with -x (and all commands from initialization files, if not inhibited with -n).  Exit
>            with nonzero status if an error occurs in executing the GDB commands in the command files.  Batch mode also disables pagination, sets unlimited terminal width and height, and
>            acts as if "set confirm off" were in effect.
141c184,210
<        -cd=directory
---
>        -batch-silent
>            Run in batch mode exactly like -batch, but totally silently.  All GDB output to "stdout" is prevented ("stderr" is unaffected).  This is much quieter than -silent and would be
>            useless for an interactive session.
> 
>            This is particularly useful when using targets that give Loading section messages, for example.
> 
>            Note that targets that give their output via GDB, as opposed to writing directly to "stdout", will also be made silent.
> 
>        -return-child-result
>            The return code from GDB will be the return code from the child process (the process being debugged), with the following exceptions:
> 
>            ·   GDB exits abnormally.  E.g., due to an incorrect argument or an internal error.  In this case the exit code is the same as it would have been without -return-child-result.
> 
>            ·   The user quits with an explicit value.  E.g., quit 1.
> 
>            ·   The child process never runs, or is not allowed to terminate, in which case the exit code will be -1.
> 
>            This option is useful in conjunction with -batch or -batch-silent, when GDB is being used as a remote program loader or simulator interface.
> 
>        -nowindows
>        -nw "No windows".  If GDB comes with a graphical user interface (GUI) built in, then this option tells GDB to only use the command-line interface.  If no GUI is available, this
>            option has no effect.
> 
>        -windows
>        -w  If GDB includes a GUI, then this option requires it to be used if possible.
> 
>        -cd directory
143a213,216
>        -data-directory directory
>        -D directory
>            Run GDB using directory as its data directory.  The data directory is where GDB searches for its auxiliary files.
> 
145,147c218,231
<        -f  Emacs sets this option when it runs GDB as a subprocess.  It tells GDB to output the full file name and line number in a standard, recognizable fashion each time a stack frame
<            is displayed (which includes each time the program stops).  This recognizable format looks like two \032 characters, followed by the file name, line number and character
<            position separated by colons, and a newline.  The Emacs-to-GDB interface program uses the two \032 characters as a signal to display the source code for the frame.
---
>        -f  GNU Emacs sets this option when it runs GDB as a subprocess.  It tells GDB to output the full file name and line number in a standard, recognizable fashion each time a stack
>            frame is displayed (which includes each time your program stops).  This recognizable format looks like two \032 characters, followed by the file name, line number and
>            character position separated by colons, and a newline.  The Emacs-to-GDB interface program uses the two \032 characters as a signal to display the source code for the frame.
> 
>        -annotate level
>            This option sets the annotation level inside GDB.  Its effect is identical to using set annotate level.  The annotation level controls how much information GDB prints together
>            with its prompt, values of expressions, source lines, and other types of output.  Level 0 is the normal, level 1 is for use when GDB is run as a subprocess of GNU Emacs, level
>            3 is the maximum annotation suitable for programs that control GDB, and level 2 has been deprecated.
> 
>            The annotation mechanism has largely been superseded by GDB/MI.
> 
>        --args
>            Change interpretation of command line so that arguments following the executable file are passed as command line arguments to the inferior.  This option stops option
>            processing.
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>        -baud bps
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<        -tty=device
---
>        -l timeout
>            Set the timeout (in seconds) of any communication used by GDB for remote debugging.
> 
>        -tty device
>        -t device
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> 
>        -tui
>            Activate the Text User Interface when starting.  The Text User Interface manages several text windows on the terminal, showing source, assembly, registers and GDB command
>            outputs.  Do not use this option if you run GDB from Emacs.
> 
>        -interpreter interp
>            Use the interpreter interp for interface with the controlling program or device.  This option is meant to be set by programs which communicate with GDB using it as a back end.
> 
>            --interpreter=mi (or --interpreter=mi2) causes GDB to use the GDB/MI interface included since GDB version 6.0.  The previous GDB/MI interface, included in GDB version 5.3 and
>            selected with --interpreter=mi1, is deprecated.  Earlier GDB/MI interfaces are no longer supported.
> 
>        -write
>            Open the executable and core files for both reading and writing.  This is equivalent to the set write on command inside GDB.
> 
>        -statistics
>            This option causes GDB to print statistics about time and memory usage after it completes each command and returns to the prompt.
> 
>        -version
>            This option causes GDB to print its version number and no-warranty blurb, and exit.
> 
>        -configuration
>            This option causes GDB to print details about its build-time configuration parameters, and then exit.  These details can be important when reporting GDB bugs.

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