Re: The add-symbol-file command comment in the manual is confusing

[Andrew Cagney <ac131313 at cygnus dot com>]

Just FYI, 

This sounds like our first (?) Doco bug :-) As for your questions,
others are definitly more qualified to comment.

	Andrew

Stephen Smith wrote:
> 
> The add-symbol-file symbol file command has the following prose in the manual:
> 
>      add-symbol-file filename address [ -readnow ] [ -mapped ]
>      The add-symbol-file command reads additional symbol table information from the file filename. You would use this
> command when filename has been dynamically
>      loaded (by some other means) into the program that is running. address should be the memory address at which the
> file has been loaded; GDB cannot figure this out for itself.
>      You can specify address as an expression. The symbol table of the file filename is added to the symbol table
> originally read with the symbol-file command. You can use
>      the add-symbol-file command any number of times; the new symbol data thus read keeps adding to the old. To discard
> all old symbol data instead, use the
>      symbol-file command. add-symbol-file does not repeat if you press RET after using it. You can use the `-mapped' and
> `-readnow' options just as with the
>      symbol-file command, to change how GDB manages the symbol table information for filename.
> 
> Several questions
> 1)  What is the difference between useing and not using the -mapped command?   Maybe I should ask first what is the use
> of the mapped switch?
> 
> 2)  The quote says that "You can specify address as an expression".  How would you do that?  And just a curriosity, how
> would you figure out the address to use?