<html>
<head>
<base href="https://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - llvm/clang using __atomic_add_fetch_8 which is not available on x86 linux"
href="https://llvm.org/bugs/show_bug.cgi?id=24908">24908</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>llvm/clang using __atomic_add_fetch_8 which is not available on x86 linux
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat test.cpp
#include <atomic>
std::atomic<uint64_t> foo;
int main() {
++foo;
}
$ clang++ test.cpp -o t -std=c++11 -m32
/tmp/test-c543d4.o:test.cpp:function std::__atomic_base<unsigned long
long>::operator++(): error: undefined reference to '__atomic_add_fetch_8'
clang-3.8: error: linker command failed with exit code 1 (use -v to see
invocation)
Running "g++ test.cpp -o t -std=c++11 -m32" works.
gcc produces a "lock cmpxchg8b" instead of a call.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>