Re: New failures: gdb.base/recurse.exp

[Michael Elizabeth Chastain <chastain@cygnus.com>]

I saw some of those on a branch inside Red Hat a few weeks ago.
Let me cut-and-paste some verbiage:

    This test script sets a watchpoint on a local variable in a recursive
    function.  It then observes the watchpoint as the function recurses
    and returns.

    In the configurations that FAIL, gdb deletes the watchpoint when
    the function calls itself.  gdb says that "the program has left the
    block in which its expression is valid".  This is an error in gdb.

    When gdb deletes the watchpoint, it stops and prints a message on
    the current line (the open brace of the function being called).
    This message desynchronizes the test script and causes a cascade
    of FAILs.

    All of the configurations which fail use software watchpoints.
    Software watchpoints use watchpoint_check, which calls
    find_frame_addr_in_frame_chain to find this information.

Michael