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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - default_terminate_handler / default_unexpected_handler is not always set due to static initialization order fiasco"
href="https://bugs.llvm.org/show_bug.cgi?id=44252">44252</a>
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<th>Summary</th>
<td>default_terminate_handler / default_unexpected_handler is not always set due to static initialization order fiasco
</td>
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<th>Product</th>
<td>libc++abi
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>speidy@gmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
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<div>
<pre>Hi,
Iv'e build libcxxabi using gcc-musl toolchain iv'e downloaded from:
<a href="http://musl.cc/x86_64-linux-musl-cross.tgz">http://musl.cc/x86_64-linux-musl-cross.tgz</a>.
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).
<a href="https://github.com/llvm/llvm-project/blob/master/libcxxabi/src/cxa_default_handlers.cpp#L96">https://github.com/llvm/llvm-project/blob/master/libcxxabi/src/cxa_default_handlers.cpp#L96</a>
This is true for `__cxa_unexpected_handler` as well.
Note: when building libcxxabi with clang++, the issue does not occur.</pre>
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