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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Type id miss match when std::any object passed to shared library on AARCH64 Linux"
href="https://bugs.llvm.org/show_bug.cgi?id=45258">45258</a>
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<th>Summary</th>
<td>Type id miss match when std::any object passed to shared library on AARCH64 Linux
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>yschandra@gmail.com
</td>
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23264" name="attach_23264" title="Example implementation">attachment 23264</a> <a href="attachment.cgi?id=23264&action=edit" title="Example implementation">[details]</a></span>
Example implementation
When RTTI is disabled libc++ has a implementation of using address of static
member for each type
(<a href="https://github.com/llvm/llvm-project/blob/master/libcxx/include/any#L154-L161">https://github.com/llvm/llvm-project/blob/master/libcxx/include/any#L154-L161</a>),
this particular method fails on AARCH64 Linux (-target aarch64-linux-android)
when a std::any object passed by reference to a method in dynamic library it
raises bad_any_cast() exception even though type did not change. The same works
as expected on x86_64 Linux (-target x86_64-linux-android). Both are same
version of clang and libc++.
This issue is seen with 9.0.0, 10.0.0rc3, trunk (11.0.0) clang & libc++.
To demonstrate the problem I have a small example implemented which reproduces
the issue without libc++.
On aarch64-linux-android this example produces output
fallback type before calling function pointer 0x40002c3b4504
fallback type in function pointer 0xaaaacc30a5d4
On x86_64-linux-android this example produces output
fallback type before calling function pointer 0x58d4496a155c
fallback type in function pointer 0x58d4496a155c
To me it appears that on AARCH64 there are 2 instances of static member one in
shared library and one in main executable, leading to this issue.
Any help is appreciated on this.</pre>
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