[Bug cli/17820] New: set history size unlimited in ~/.gdbinit disables history

["dje at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17820

            Bug ID: 17820
           Summary: set history size unlimited in ~/.gdbinit disables
                    history
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: cli
          Assignee: unassigned at sourceware dot org
          Reporter: dje at google dot com

I have this in my ~/.gdbinit:

set history size unlimited

but I generally always use emacs so I've never noticed this.

It doesn't work because while set_history_size_command knows how to
map "unlimited" (== UINT_MAX) to DTRT, init_history does not, which passes
UINT_MAX to stifle_history, which takes an int, and boom.

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