gdb/36: testsuite/gdb.base/exprs.exp loses synchronization

[chastain at redhat dot com]

>Number:         36
>Category:       gdb
>Synopsis:       testsuite/gdb.base/exprs.exp loses synchronization
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 09 12:08:00 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     chastain@redhat.com
>Release:        cvs 2001-03-08
>Organization:
>Environment:
Solaris 2.6

>Description:
In the section "test expressions with pointers out of range",
the test script says:

  send_gdb "print sizeof (long long) > sizeof(long)\n"
  gdb_expect {
    -re "\\$\[0-9\]* = $true" {
       set ok 1
       pass "sizeof (long long) > sizeof (long) (true)"
    }
    ...
  }

The regular expression does not capture $gdb_prompt.
This leads to intermittent failures of the next test:

  print sizeof (long long) > sizeof (long)^M
  $197 = 1^M
  (gdb) PASS: gdb.base/exprs.exp: sizeof (long long) > sizeof(long) (true)
  FAIL: gdb.base/exprs.exp: truncate (void*) 0x00000000ffffffff + 1
  warning: value truncated^M
  $198 = (void *) 0x0^M

The second test FAILs before its output comes back,
because it's getting the prompt from the first test.

>How-To-Repeat:
Run this test on Solaris 2.5, 2.6, 2.7, and 2.8
multiple times (three times is good).  I think the failure
rate is >50% per trial.
>Fix:
Match up to "$gdb_prompt $" in the regular expressions.
>Release-Note:
>Audit-Trail:
>Unformatted: