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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Putting std::optional to std::any seems broken with visbility=hidden"
href="https://bugs.llvm.org/show_bug.cgi?id=49399">49399</a>
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<th>Summary</th>
<td>Putting std::optional to std::any seems broken with visbility=hidden
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
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<th>Version</th>
<td>10.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>predelnik@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>a.cpp:
#include <optional>
#include <any>
std::optional<int> f (const std::any &value)
{
return std::any_cast<std::optional<int>> (value);
}
std::any g ();
int main ()
{
return f (g ()).value_or (0);
}
b.cpp:
#include <any>
#include <optional>
[[gnu::visibility("default")]] std::any g () { return std::make_optional (1); }
Running with:
clang++ -stdlib=libc++ b.cpp -std=c++20 -shared -fPIC -o b.so
-fvisibility=hidden
clang++ -stdlib=libc++ a.cpp -std=c++20 -L . -l:b.so
LD_LIBRARY_PATH=. ./a.out
Example works fine with libstdc++, seems like something is wrong with
std::optional visbiility</pre>
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