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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - OCaml bindings don't link to libLLVM-3.x.so with -Wl,--as-needed"
href="http://llvm.org/bugs/show_bug.cgi?id=22014">22014</a>
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<th>Summary</th>
<td>OCaml bindings don't link to libLLVM-3.x.so with -Wl,--as-needed
</td>
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<th>Product</th>
<td>Build scripts
</td>
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<th>Version</th>
<td>trunk
</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>Makefiles
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>evangelos@foutrelis.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13587" name="attach_13587" title="Fix OCaml bindings linking with -Wl,--as-needed">attachment 13587</a> <a href="attachment.cgi?id=13587&action=edit" title="Fix OCaml bindings linking with -Wl,--as-needed">[details]</a></span>
Fix OCaml bindings linking with -Wl,--as-needed
When building LLVM with "-Wl,--as-needed" in LDFLAGS (as it's been the default
in Arch Linux for several years now), the OCaml bindings' .so libs won't get
linked to libLLVM-3.x.so and thus result in undefined symbols when they are
used:
<span class="quote">> /usr/lib/ocaml/dllllvm.so: undefined symbol: LLVMGetFirstUse</span >
I believe this is caused by the object files appearing after the libraries
during the linking stage. [1]
I've attached a patch for Makefile.ocaml which fixes the issue for me.
(I only tested with LLVM 3.5 but this issue should affect /trunk as well.)
[1]
<a href="https://wiki.mageia.org/en/Overlinking_issues_in_packaging#Wrong_linking_order">https://wiki.mageia.org/en/Overlinking_issues_in_packaging#Wrong_linking_order</a></pre>
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