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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - mis-compile of TLS+alias (extracted from glibc's errno.c)"
href="http://llvm.org/bugs/show_bug.cgi?id=21288">21288</a>
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<th>Summary</th>
<td>mis-compile of TLS+alias (extracted from glibc's errno.c)
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>david.majnemer@gmail.com
</td>
</tr>
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<th>Reporter</th>
<td>kcc@google.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>test case (extracted from glibc's csu/errno.c):
__thread int TL_WITH_ALIAS;
extern __thread int __libc_errno __attribute__ ((alias ("TL_WITH_ALIAS")));
gcc produces tbss.
clang produces bss. (tested with clang r219701 on x86_64 linux)
Chandler says to show this to David Majnemer
% for c in gcc clang; do $c -S p.c -o -; echo =======================; done
.file "p.c"
.globl TL_WITH_ALIAS
.section .tbss,"awT",@nobits
.align 4
.type TL_WITH_ALIAS, @object
.size TL_WITH_ALIAS, 4
TL_WITH_ALIAS:
.zero 4
.globl __libc_errno
.set __libc_errno,TL_WITH_ALIAS
.ident "GCC: (Ubuntu 4.8.2-19ubuntu1) 4.8.2"
.section .note.GNU-stack,"",@progbits
=======================
.text
.file "p.c"
.type TL_WITH_ALIAS,@object # @TL_WITH_ALIAS
.bss
.globl TL_WITH_ALIAS
.align 4
TL_WITH_ALIAS:
.long 0 # 0x0
.size TL_WITH_ALIAS, 4
.globl __libc_errno
__libc_errno = TL_WITH_ALIAS
.ident "clang version 3.6.0 (219701)"
.section ".note.GNU-stack","",@progbits
=======================</pre>
</div>
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