[patch, testsuite] check for readline support in gdb.base/history-duplicates.exp

[Yao Qi]

Sandra Loosemore <sandra@codesourcery.com> writes:

> The testcase gdb.base/history-duplicates.exp checks the interaction
> between "set history remove-duplicates" and scrolling back through
> command history with ^P, thus it only makes sense if readline support
> is present.  I've copied the test that currently appears in
> readline.exp and other places.  OK to commit?

Yes, patch is OK.

For the record, there is no fails with board file local-remote-host
(which has tty),

$ make check RUNTESTFLAGS="--host_board=local-remote-host --target_board=local-remote-host  history-duplicates.exp"

but there are some fails with local-remote-host-notty (readline is
disabled due to lack of tty),

FAIL: gdb.base/history-duplicates.exp: remove-duplicates=unlimited: history entry is print 4
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=unlimited: history entry is print 3
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=unlimited: history entry is print 2
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=unlimited: history entry is print 1
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=unlimited: history entry is print 0
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=1: history entry is print 1
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=1: history entry is print 2
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=1: history entry is print 0
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=1: history entry is print 1 (again)
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=1: history entry is print 0 (again)
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=0: history entry is print 1
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=0: history entry is print 1 (again)
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=0: history entry is print 0
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=0: history entry is print 0 (again)
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=2: history entry is print 0
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=2: history entry is print 2
FAIL: gdb.base/history-duplicates.exp: remove-duplicates=2: history entry is print 1

-- 
Yao (齐尧)