[Bug 253840] editors/libreoffice: fails to start after update to 7.1.0.3_2 with "Application Error"

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253840

--- Comment #21 from Dimitry Andric <dim at FreeBSD.org> ---
I've looked at the layout of struct _Unwind_Exception, which is declared in
libcxxrt's unwind.h, and did some checks on the field offsets:

----------------------------------------------------------------------
amd64, before libcxxrt changes:

offsetof(_Unwind_Exception, exception_class)   = 0
offsetof(_Unwind_Exception, exception_cleanup) = 8
offsetof(_Unwind_Exception, private_1)         = 16
offsetof(_Unwind_Exception, private_2)         = 24
sizeof(_Unwind_Exception)                      = 32

amd64, after libcxxrt changes:

offsetof(_Unwind_Exception, exception_class)   = 0
offsetof(_Unwind_Exception, exception_cleanup) = 8
offsetof(_Unwind_Exception, private_1)         = 16
offsetof(_Unwind_Exception, private_2)         = 24
sizeof(_Unwind_Exception)                      = 32


i386, before libcxxrt changes:

offsetof(_Unwind_Exception, exception_class)   = 0
offsetof(_Unwind_Exception, exception_cleanup) = 8
offsetof(_Unwind_Exception, private_1)         = 12
offsetof(_Unwind_Exception, private_2)         = 16
sizeof(_Unwind_Exception)                      = 20

i386, after libcxxrt changes:

offsetof(_Unwind_Exception, exception_class)   = 0
offsetof(_Unwind_Exception, exception_cleanup) = 8
offsetof(_Unwind_Exception, private_1)         = 12
offsetof(_Unwind_Exception, private_2)         = 16
offsetof(_Unwind_Exception, reserved)          = 20
sizeof(_Unwind_Exception)                      = 32
----------------------------------------------------------------------

So in short, only on i386 has the struct become bigger, but this shouldn't
influence any callers. (At least, if they aren't crazy enough to attempt to
allocate and fill these by themselves... But libreoffice might be crazy enough)

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