[Bug cli/27125] unwanted interaction of [-ex "bt"] with [-batch -return-child-result]. used to work in gdb 8.1

["kelly at 219design dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27125

--- Comment #1 from kelly at 219design dot com ---
I have located the commit that introduced the behavior change. I can clearly
see that the change was intentional, and yet I would still like to question
whether "-return-child-result" should be given special consideration.

Commit that introduced the unexpected "-return-child-result" outcome:

commit b0f492b90f3d13da8ac80437e6ecb9a87db4a75b (refs/bisect/bad)
Author: Gary Benson <gbenson@redhat.com>
Date:   Wed Aug 29 16:11:50 2018 +0100

    Indicate batch mode failures by exiting with nonzero status

    This commit causes GDB in batch mode to exit with nonzero status
    if the last command to be executed fails.

    gdb/ChangeLog:

            PR gdb/13000:
            * gdb/main.c (captured_main_1): Exit with nonzero status
            in batch mode if the last command to be executed failed.
            * NEWS: Mention the above.

    gdb/testsuite/ChangeLog:

            PR gdb/13000:
            * gdb.base/batch-exit-status.exp: New file.
            * gdb.base/batch-exit-status.good-commands: Likewise.
            * gdb.base/batch-exit-status.bad-commands: Likewise.

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