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<body><span class="vcard"><a class="email" href="mailto:kamikaze@bsdforen.de" title="Dominic Fandrey <kamikaze@bsdforen.de>"> <span class="fn">Dominic Fandrey</span></a>
</span> changed
<a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - link success with static template member depends on optimisation level"
href="http://llvm.org/bugs/show_bug.cgi?id=20593">bug 20593</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>RESOLVED
</td>
<td>REOPENED
</td>
</tr>
<tr>
<td style="text-align:right;">Resolution</td>
<td>INVALID
</td>
<td>---
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - link success with static template member depends on optimisation level"
href="http://llvm.org/bugs/show_bug.cgi?id=20593#c3">Comment # 3</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - link success with static template member depends on optimisation level"
href="http://llvm.org/bugs/show_bug.cgi?id=20593">bug 20593</a>
from <span class="vcard"><a class="email" href="mailto:kamikaze@bsdforen.de" title="Dominic Fandrey <kamikaze@bsdforen.de>"> <span class="fn">Dominic Fandrey</span></a>
</span></b>
<pre>New code, works with -O1 and -O2, shouldn't work, because the uninitialised
static member is used.
--- foo.hpp ---
#ifndef _FOO_HPP_
#define _FOO_HPP_
#include <memory>
template <class T>
class foo {
private:
static std::allocator<T> alloc;
T * const payload;
public:
foo(T const val) : payload(foo<T>::alloc.allocate(1)) {
this->payload[0] = val;
}
virtual ~foo() {
foo<T>::alloc.deallocate(payload, 1);
}
T const & getPayload() const {
return this->payload[0];
}
};
#endif /* _FOO_HPP_ */
--- main.cpp ---
#include "foo.hpp"
#include <iostream>
int main() {
foo<int> bar(1337);
std::cout << &bar.getPayload() << ": " << bar.getPayload() << '\n';
return 0;
}
<span class="quote">> c++ -O2 main.cpp && ./a.out </span >
0x801c06058: 1337
<span class="quote">> c++ -O1 main.cpp && ./a.out </span >
0x801c06058: 1337
<span class="quote">> c++ -O0 main.cpp && ./a.out </span >
/tmp/main-e745e6.o: In function `foo<int>::foo(int)':
main.cpp:(.text._ZN3fooIiEC2Ei[_ZN3fooIiEC2Ei]+0xc): undefined reference to
`foo<int>:
:alloc'
/tmp/main-e745e6.o: In function `foo<int>::~foo()':
main.cpp:(.text._ZN3fooIiED2Ev[_ZN3fooIiED2Ev]+0xc): undefined reference to
`foo<int>:
:alloc'
c++: error: linker command failed with exit code 1 (use -v to see invocation)</pre>
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