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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - LLD doesn't like it if LLVM_LINK_LLVM_DYLIB is turned on"
href="https://llvm.org/bugs/show_bug.cgi?id=27685">27685</a>
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<th>Summary</th>
<td>LLD doesn't like it if LLVM_LINK_LLVM_DYLIB is turned on
</td>
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<th>Product</th>
<td>lld
</td>
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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>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>All Bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>ed@80386.nl
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Sylvestre Ledru and I are currently working on extending the Debian packages
for LLVM (<a href="http://llvm.org/apt/">http://llvm.org/apt/</a>) to also contain LLD. Sylvestre observed that
his copy of LLD crashes on startup with the following message:
$ lld-3.9
: CommandLine Error: Option 'asm-instrumentation' registered more than once!
LLVM ERROR: inconsistency in registered CommandLine options
*** Error in `lld-3.9': free(): invalid pointer: 0x00007fbcc967ab78 ***
======= Backtrace: =========
...
Looking into this in more detail, it seems like his copy of LLD is both
statically and dynamically linked against LLVM libraries, which happens because
he's building LLD with LLVM_LINK_LLVM_DYLIB set.
Taking a quick glance at the LLD CMakeLists, I can imagine why this is
happening. The add_lld_library() calls explicitly list the LLVM libraries we
are interested in using. This is different from how this is done in the LLVM
source tree, where we set LLVM_LINK_COMPONENTS to a list of libraries we want
to use. These libraries are ignored if LLVM_LINK_LLVM_DYLIB is set (see
cmake/modules/AddLLVM.cmake).
I have to confess I know too little of CMake to fix this myself. Otherwise I
would have sent out a code review for this. Just filing this bug to make sure
it won't get lost.</pre>
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