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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLD with LTO breaks ELF symbol versioning"
href="https://bugs.llvm.org/show_bug.cgi?id=46420">46420</a>
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<th>Summary</th>
<td>LLD with LTO breaks ELF symbol versioning
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>ELF
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>itay.bookstein@nextsilicon.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, smithp352@googlemail.com
</td>
</tr></table>
<p>
<div>
<pre>Minimal repro follows below.
My debugging seems to indicate that the call to sym->parseSymbolVersion() in
LinkerDriver::compileBitcodeFiles() causes the observed truncation. The method
does indeed truncate the symbol object's name as reported by Symbol::getName(),
but that seems to be the very intention of that method. Perhaps it is done too
early? Perhaps the code that builds the symbol table needs to take the
parsed-version-state into account? I'm not quite sure yet.
~itay@local:~> cat try.ll
target triple = "x86_64-unknown-linux-gnu"
module asm ".symver loc1,<a href="mailto:loc1@GLIBC_2.2.5">loc1@GLIBC_2.2.5</a>"
@loc1 = local_unnamed_addr global i8* null, align 8
~itay@local:~> cat build.sh
#!/bin/bash -eu
_DIR=/home/itay/Projects/llvm-project/Debug/bin
${_DIR}/llvm-as try.ll -o try.bc
${_DIR}/clang -fuse-ld=lld -nostdlib -nostartfiles -r try.bc -o
try_reloclink_nolto.o
${_DIR}/clang -fuse-ld=lld -nostdlib -nostartfiles -r try.bc -o
try_reloclink_lto.o -flto
file try_reloclink*
${_DIR}/llvm-nm try_reloclink*
~itay@local:~> ./build.sh
try_reloclink_lto.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV),
not stripped
try_reloclink_nolto.o: ELF 64-bit LSB relocatable, x86-64, version 1 (SYSV),
not stripped
try_reloclink_lto.o:
0000000000000000 B loc1
0000000000000000 B loc1
try_reloclink_nolto.o:
0000000000000000 B loc1
0000000000000000 B <a href="mailto:loc1@GLIBC_2.2.5">loc1@GLIBC_2.2.5</a></pre>
</div>
</p>
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