[libcxx-dev] Static initialization order potential issue in libcxxabi

[Idan Freiberg via libcxx-dev]

Hello,

I believe iv'e identified an issue with libcxxabi.
The symptom is that, when calling std::treminate() on some simple program,
the program segfaults.

After a bit of debugging libcxxabi, Iv'e noticed that
`__cxa_terminate_handler` is NULL at program initialization. However,
calling std::set_terminate(nullptr); sets the actual default terminate
handler (in my case is just std::abort).

I tend to believe this is related to an static initialization order issue,
in which `__cxa_terminate_handler`  doesn't not get this correct value of
std::abort (set by default_terminate_handler).
https://github.com/llvm/llvm-project/blob/master/libcxxabi/src/cxa_default_handlers.cpp#L96

One solution for iv'e found is wrapping the default_terminate_handler with
a function and set this function as __cxa_terminate_handler first.

I would be happy to hear your insights about this.

-- 
Idan Freiberg
Mobile: +972-52-2925213
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/libcxx-dev/attachments/20191208/bc14517d/attachment.html>