[Bug backtrace/19293] enabling or disabling an unwinder doesn't affect "bt"

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

https://sourceware.org/bugzilla/show_bug.cgi?id=19293

--- Comment #4 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=e0f3fd7c44cebec7d787893b9c800e7de509cb32

commit e0f3fd7c44cebec7d787893b9c800e7de509cb32
Author: Tom Tromey <tom@tromey.com>
Date:   Thu Jun 9 15:20:09 2016 -0600

    PR python/19293 - invalidate frame cache when unwinders change

    PR python/19293 notes that when a Python unwinder is disabled, the
    frame cache is not invalidated.  This means that disabling an unwinder
    doesn't have any immediate effect -- but in my experience it's often
    the case that I want to enable or disable an unwinder in order to see
    what happens.

    This patch adds a new gdb.invalidate_cached_frames function and
    arranges for the relevant bits of library code to call it.  I've only
    partially documented this function, considering a warning sufficient
    without going into all the reasons ordinary code should not call it.
    The name of the new function was taken from a comment in frame.h next
    to reinit_frame_cache.

    No new test as I think the updates to the existing test are sufficient
    to show that the code is working as intended.

    Built and regtested on x86-64 Fedora 23.

    2016-07-12  Tom Tromey  <tom@tromey.com>

        PR python/19293:
        * python/lib/gdb/command/unwinders.py (do_enable_unwinder): Call
        gdb.invalidate_cached_frames.
        * python/lib/gdb/unwinder.py (register_unwinder): Call
        gdb.invalidate_cached_frames.
        * python/python.c (gdbpy_invalidate_cached_frames): New function.
        (python_GdbMethods): Add entry for invalidate_cached_frames.

    2016-07-12  Tom Tromey  <tom@tromey.com>

        PR python/19293:
        * python.texi (Frames In Python): Document
        gdb.invalidate_cached_frames.

    2016-07-12  Tom Tromey  <tom@tromey.com>

        PR python/19293:
        * gdb.python/py-unwind-maint.exp: Update tests.

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