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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLD fails to merge similarly named sections"
href="https://bugs.llvm.org/show_bug.cgi?id=42289">42289</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>LLD fails to merge similarly named sections
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</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>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>ELF
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ndesaulniers@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org, sedat.dilek@gmail.com, srhines@google.com
</td>
</tr>
<tr>
<th>Blocks</th>
<td>4068
</td>
</tr></table>
<p>
<div>
<pre>via: <a href="https://github.com/ClangBuiltLinux/linux/issues/431">https://github.com/ClangBuiltLinux/linux/issues/431</a>
It seems that ld.bfd merges sections with the same name, whereas ld.lld does
not.
$ ld.bfd -r -o driver.ko ath10k_core.o ath10k_core.mod.o
$ readelf -S driver.ko | grep rodata\.cst32 [71] .rodata.cst32 PROGBITS
0000000000000000 00062d60
$ ld.lld -r -o driver.ko ath10k_core.o ath10k_core.mod.o
$ readelf -S driver.ko | grep rodata\.cst32
[104] .rodata.cst32 PROGBITS 0000000000000000 00a20850
[157] .rodata.cst32 PROGBITS 0000000000000000 00a20e20
This produces dmesg warnings for kernel modules linked with LLD:
$ dmesg | grep sysfs:
[ 1.969125] sysfs: cannot create duplicate filename
'/module/i915/sections/.rodata.cst16'
[ 3.954645] sysfs: cannot create duplicate filename
'/module/bluetooth/sections/.rodata.cst16'
[ 4.009524] sysfs: cannot create duplicate filename
'/module/mac80211/sections/.rodata.cst32'
[ 4.122455] sysfs: cannot create duplicate filename
'/module/ath10k_core/sections/.rodata.cst32'</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_CONFIRMED "
title="CONFIRMED - [Meta] Compiling the Linux kernel with clang"
href="https://bugs.llvm.org/show_bug.cgi?id=4068">Bug 4068</a>] [Meta] Compiling the Linux kernel with clang
</li>
</ul>
</div>
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