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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang failed to emit method definition in template class (e.g. std::set)"
href="https://bugs.llvm.org/show_bug.cgi?id=49442">49442</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang failed to emit method definition in template class (e.g. std::set)
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ytj000@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Steps to Reproduce:
Online version: <a href="https://wandbox.org/permlink/M22DS95maZND7g3X">https://wandbox.org/permlink/M22DS95maZND7g3X</a>
Basically for the following code
```
// a.h
#pragma once
#include <set>
struct Foo {
Foo();
~Foo();
std::set<int> field;
void operator=(const std::set<int>& value) {
field = value;
}
};
// a.cpp
#include "a.h"
Foo::Foo() {}
Foo::~Foo() {}
// prog.cc
#include "a.h"
template <class>
void f() {
Foo s;
s = {24};
}
int main() {
f<int>();
}
```
Gcc accepts the code, but clang rejects with following error message
```
/tmp/prog-66526a.o: In function `void f<int>()':
prog.cc:(.text._Z1fIiEvv[_Z1fIiEvv]+0x59): undefined reference to
`std::__1::set<int, std::__1::less<int>, std::__1::allocator<int> >::~set()'
prog.cc:(.text._Z1fIiEvv[_Z1fIiEvv]+0x8e): undefined reference to
`std::__1::set<int, std::__1::less<int>, std::__1::allocator<int> >::~set()'
/usr/bin/ld: prog.exe: hidden symbol
`_ZNSt3__13setIiNS_4lessIiEENS_9allocatorIiEEED1Ev' isn't defined
/usr/bin/ld: final link failed: Bad value
clang-13: error: linker command failed with exit code 1 (use -v to see
invocation)
```
It looks like clang did not emit `std::set<int>::~set()` in `prog.cc` while it
should.
This can be reproduced in both clang++ 7.0/9.0/trunk on CentOS 8.</pre>
</div>
</p>
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