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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - RTLD_LAZY does not work if compiled with clang"
href="https://bugs.llvm.org/show_bug.cgi?id=37779">37779</a>
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<tr>
<th>Summary</th>
<td>RTLD_LAZY does not work if compiled with clang
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Driver
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>tom.ty89@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20421" name="attach_20421" title="Example">attachment 20421</a> <a href="attachment.cgi?id=20421&action=edit" title="Example">[details]</a></span>
Example
Supposedly with RTLD_LAZY, symbols will only be resolved as the code references
them are executed. However, when compiled with clang, undefined symbols are
being resolved before dlopen() returns, as if RTLD_NOW is used.
Here's the difference when the attached example is compiled with gcc and clang
respectively:
$ make
cc -shared libshared.c -o libshared.so
cc -shared libplugin.c -o libplugin.so
cc main.c -ldl -o executable
$ ./executable
plugin: value = 42
$ make clean
rm -f executable libshared.so libplugin.so
$ make CC=clang
clang -shared libshared.c -o libshared.so
clang -shared libplugin.c -o libplugin.so
clang main.c -ldl -o executable
$ ./executable
dlopen failed: ./libplugin.so: undefined symbol: libshared_get_value
$</pre>
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