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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Non-type parameter link failure"
href="http://llvm.org/bugs/show_bug.cgi?id=15858">15858</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Non-type parameter link failure
</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>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>kjw.chiu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>When using decltype on a function pointer template parameter to define
a data member, it seems to generate an incorrect external reference.
This code:
template <typename R, typename P, R F(P)>
struct B {
B() { v = F; }
decltype(F) v;
};
void foo(int) {}
int main() {
B<void, int, &foo> o;
}
results in this error:
$ clang++ --version
clang version 3.3 (trunk 180631)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ clang++ -std=c++11 bug.cpp
/tmp/bug-FYJpAX.o: In function `B<void, int, &(foo(int))>::B()':
bug.cpp:(.text._ZN1BIviXadL_Z3fooiEEEC2Ev[_ZN1BIviXadL_Z3fooiEEEC2Ev]+0x14):
undefined reference to `B<void, int, &(foo(int))>::v'
clang: error: linker command failed with exit code 1 (use -v to see
invocation)
The compiler seems to have treated v as if it were a static data member.</pre>
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