<html>
<head>
<base href="http://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 --- - Clang fails to link program with extern address-taken initial-exec thread-local variable"
href="http://llvm.org/bugs/show_bug.cgi?id=22083">22083</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang fails to link program with extern address-taken initial-exec thread-local variable
</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>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>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>vonosmas@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ cat tmp/a.h
__attribute__((tls_model("initial-exec")))
extern __thread unsigned long a;
$ cat tmp/a.cc
#include "a.h"
int main() {
return (unsigned long)(&a) % sizeof(a);
}
$ cat tmp/b.cc
#include "a.h"
__thread unsigned long a;
$ ./bin/clang++ tmp/a.cc -c -o a.o ; ./bin/clang++ tmp/b.cc -c -o b.o ;
./bin/clang++ a.o b.o -o a.out ; ./a.out ; echo $?
/usr/bin/ld: a.o: TLS transition from R_X86_64_GOTTPOFF to R_X86_64_TPOFF32
against `a' at 0xd in section `.text' failed
/usr/bin/ld: final link failed: Bad value
Note that this example links and runs successfully if I use GCC or Clang 3.5</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>