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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - is_equal failure with GCC shared libraries"
href="https://llvm.org/bugs/show_bug.cgi?id=26785">26785</a>
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<th>Summary</th>
<td>is_equal failure with GCC shared libraries
</td>
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<th>Product</th>
<td>libc++abi
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>rianquinn@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Libcxxabi does not appear to properly handle typeinfo when working across
multiple shared libraries compiled using GCC. The issue I am having is throwing
an exception in one shared library, and catching in another, but I also noticed
that dynamic_cast has the same issue (cast from a different shared library). In
both cases they fail.
At the very top of private_typeinfo.cpp, there is the following function:
is_equal(const std::type_info* x, const std::type_info* y, bool use_strcmp)
{
#ifndef _WIN32
if (!use_strcmp)
return x == y;
return strcmp(x->name(), y->name()) == 0;
#else
return (x == y) || (strcmp(x->name(), y->name()) == 0);
#endif
}
If I modify this code such that, it thinks it's Windows the problem goes away
(i.e. it always performs the strcmp if needed). I am currently using the latest
GCC (5.3) and the latest libcxxabi (master - head).</pre>
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