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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Can emit SHF_MERGE section with a sh_entsize of 0"
href="http://llvm.org/bugs/show_bug.cgi?id=22463">22463</a>
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<th>Summary</th>
<td>Can emit SHF_MERGE section with a sh_entsize of 0
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>MC
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>peter@pcc.me.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given the following IR:
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
$foo = comdat any
@foo = unnamed_addr constant [4 x i32] [i32 7, i32 8, i32 9, i32 10], comdat
define [4 x i32]* @f() {
ret [4 x i32]* @foo
}
we can emit a SHF_MERGE section with a sh_entsize of 0. This is invalid and can
cause some versions of gold to crash.
$ ~/src/llvm-build-rel/bin/llc -filetype=obj -o foo.o foo.ll
$ readelf -a -W foo.o | grep rodata.foo
[ 6] .rodata.foo PROGBITS 0000000000000000 000058 000010 00 AMG
0 0 4
$ ld.gold -r -o foo2.o foo.o
Floating point exception (core dumped)
(binutils bug fix: <a href="https://sourceware.org/ml/binutils/2015-02/msg00040.html">https://sourceware.org/ml/binutils/2015-02/msg00040.html</a>)</pre>
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