[llvm-bugs] [Bug 44252] New: default_terminate_handler / default_unexpected_handler is not always set due to static initialization order fiasco

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=44252

            Bug ID: 44252
           Summary: default_terminate_handler / default_unexpected_handler
                    is not always set due to static initialization order
                    fiasco
           Product: libc++abi
           Version: 8.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: speidy at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Hi,

Iv'e build libcxxabi using gcc-musl toolchain iv'e downloaded from:
http://musl.cc/x86_64-linux-musl-cross.tgz.

When using libcxxabi built by the mentioned toolchain, iv'e noticed that call
to std::terminate() will crash the program.

However, a call to `std::set_terminate(nullptr);` first, will actually set the
default_terminate_handler to the right one (in my case std::abort), then
another call to std::terminate() will succeed.

After a bit of debugging libcxxabi, Iv'e noticed that `__cxa_terminate_handler`
is NULL at program initialization.
I tend to believe this is related to a static initialization order issue, in
which `__cxa_terminate_handler`  doesn't not get the correct value of
`default_terminate_handler` (which should be statically initialized to some
handler func, such as std::abort). 
https://github.com/llvm/llvm-project/blob/master/libcxxabi/src/cxa_default_handlers.cpp#L96

This is true for `__cxa_unexpected_handler` as well.

Note: when building libcxxabi with clang++, the issue does not occur.

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