[Bug libc/20544] RFE: atexit, __cxa_atexit, on_exit detect NULL function pointer argument

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20544

--- Comment #4 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to John Reiser from comment #3)
>  __cxa_atexit is involved in my big app written in C++ and Python.  Using
> -flto, one function pointer definitely is NULL.  Obviously this is a bug;
> finding it is tedious.

If it is only about finding the culprit, a conditional breakpoint or a
Systemtap script should help here.

I don't think the code generated by GCC checks the return value of
__cxa_atexit, so an error return would not help anyway, we would have to
terminate the process.

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