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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Mangled name for std::is_same within function identifier changes when including <complex>"
href="https://bugs.llvm.org/show_bug.cgi?id=34810">34810</a>
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<th>Summary</th>
<td>Mangled name for std::is_same within function identifier changes when including <complex>
</td>
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<th>Product</th>
<td>libc++
</td>
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<th>Version</th>
<td>5.0
</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>
</tr>
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<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
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>yaghmour.shafik@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
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<p>
<div>
<pre>Given the following code:
#include <complex>
#include <type_traits>
template <typename T>
std::enable_if_t<std::is_same<T, float>::value, float> f(const void *g)
{ return {}; }
template float f<float>(const void *g);
int main(){ return 0; }
and using the following command line options to clang++:
-stdlib=libc++ -std=c++14
The mangled name for the f(const void *g) drops std:: from std::is_same, we
get:
__Z1fIfENSt3__19enable_ifIXsr7is_sameIT_fEE5valueEfE4typeEPKv
^^^
See gotbolt example: <a href="https://godbolt.org/g/RehUpq">https://godbolt.org/g/RehUpq</a>
while dropping dropping the include of <complex> we get:
__Z1fIfENSt9enable_ifIXsr3std7is_sameIT_fEE5valueEfE4typeEPKv
^^^^
See godbolt example: <a href="https://godbolt.org/g/CkEwJw">https://godbolt.org/g/CkEwJw</a>
In our larger application this is causing a linker failure.
I don't believe this is expected behavior, we should expect the same type for
std::is_same<float,float> whether we include <complex> or not</pre>
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