[Bug gdb/19750] New: defining hook(post)-where produces "'hook(post)-where' command does not hook any existing command"

["r.l.bongers at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19750

            Bug ID: 19750
           Summary: defining hook(post)-where produces "'hook(post)-where'
                    command does not hook any existing command"
           Product: gdb
           Version: 7.10
            Status: NEW
          Severity: minor
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: r.l.bongers at gmail dot com
  Target Milestone: ---

Defining hook-where or hookpost-where produces the message that where is not an
existing command.

>(gdb) define hook-where
>Warning: Your new `hook-where' command does not hook any existing command.
>Proceed? (y or n)
>(gdb) define hookpost-where
>Warning: Your new `hookpost-where' command does not hook any existing command.
>Proceed? (y or n)

Where is indeed defined as a command.

>gdb helloworld.c
>b main
>r
>where
>#0 0x00000000004004ea in main ()

hook-(cmd) and hookpost-(cmd) work for other functions.

>(gdb) define hook-print
>>echo hook\n
>>end
>(gdb) print "test string"
>hook
>$1 = "test string"

Hooks for where cannot be defined in .gdbinit files or using the -x command on
scripts either.

Temporary solution if you only need basic where ability:

>define where
>frame
>end
>define hook-frame
>...
>end

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