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From: "cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug breakpoints/29548] Can't breakpoint __cxa_throw with
 Qt5Core.dll
Date: Tue, 05 Dec 2023 17:47:32 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29548

--- Comment #1 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Hannes Domani <ssbssa@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=3Dbinutils-gdb.git;h=3D6e28dd6fa302=
7d38351d2cf672509eca05aa19fd

commit 6e28dd6fa3027d38351d2cf672509eca05aa19fd
Author: Hannes Domani <ssbssa@yahoo.de>
Date:   Tue Dec 5 18:41:44 2023 +0100

    Fix breakpoints on symbols with multiple trampoline symbols

    On mingw targets it's possible that there are multiple trampoline
    symbols for __cxa_throw, in each module where a throw is done, but
    without a corresponding global symbol.
    Since commit 77f2120b200be6cabbf6f610942fc1173a8df6d3 they cancel each
    other out in search_minsyms_for_name, which makes it impossible to set
    a breakpoint there:

    (gdb) b __cxa_throw
    Function "__cxa_throw" not defined.
    Make breakpoint pending on future shared library load? (y or [n]) y
    Breakpoint 2 (__cxa_throw) pending.
    (gdb) c
    Continuing.
    [Inferior 1 (process 10004) exited with code 03]

    With catch throw it also doesn't work, and you don't even get an error
    message:

    (gdb) catch throw
    Catchpoint 2 (throw)
    (gdb) c
    Continuing.
    [Inferior 1 (process 5532) exited with code 03]
    (gdb)

    The fix is to simply ignore other trampoline symbols when looking for
    corresponding global symbols, and it's working as expected:

    (gdb) b __cxa_throw
    Breakpoint 2 at 0x13f091590 (2 locations)
    (gdb) c
    Continuing.

    Breakpoint 2.1, 0x000000013f091590 in __cxa_throw ()
    (gdb)

    And catch throw also works again:

    (gdb) catch throw
    Catchpoint 2 (throw)
    (gdb) c
    Continuing.

    Catchpoint 2.1 (exception thrown), 0x000000013f181590 in __cxa_throw ()
    (gdb)

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=3D29548
    Approved-By: Tom Tromey <tom@tromey.com>

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