[Bug gdb/18208] Fails in gdb.base/coredump-filter.exp in remote testing

["qiyao at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18208

--- Comment #9 from Yao Qi <qiyao at gcc dot gnu.org> ---
(In reply to Pedro Alves from comment #8)

> so it sounds like the issue may be on your board file.  I haven't tried it
> through a board file myself though.  We should probably have a board file
> that does real remote gdbserver testing against localhost...

Maybe, I hacked the test case to set /proc/PID/coredump_filter in the C code,

int
set_coredump_filter (int pid, int bits)
{
  char cmd[80];

  snprintf(cmd, sizeof cmd, "echo %d > /proc/%d/coredump_filter", bits, pid);
  return system (cmd);
}

and call set_coredump_filter in gdb like this,

gdb_test "p set_coredump_filter (${ipid}, ${filter_flag})" " = 0"

all the fails go away.

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