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

[Eric Fiselier via libcxx-dev]

I've committed a fix, though I was unable to reproduce the problem with
unit tests.

https://github.com/llvm/llvm-project/commit/a9245e4f86165ac38a297138fff08cd4eb7255a7

Could you please confirm it on your end?

On Sun, Dec 8, 2019, 6:52 AM Idan Freiberg via libcxx-dev <
libcxx-dev at lists.llvm.org> wrote:

> 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
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