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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Undefined symbol checking should be done after --gc-sections, not before"
href="https://llvm.org/bugs/show_bug.cgi?id=26360">26360</a>
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<th>Summary</th>
<td>Undefined symbol checking should be done after --gc-sections, not before
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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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
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<th>Reporter</th>
<td>ed@80386.nl
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>With GNU ld, the following C application will build properly if --gc-sections
is passed to the linker:
----------------
void undefined_function(void);
void unreferenced_function(void);
void unreferenced_function(void) {
undefined_function();
}
int main(int argc, char **argv) {
return 0;
}
----------------
As in, if code is unreferenced and is about to be pruned away by --gc-sections,
it is allowed to contain references to undefined symbols. My observation is
that lld 3.8.0rc1 does not allow this. In other words, the checking for
undefined symbols is done before --gc-sections is performed, instead of the
other way around.
I'm not saying that what GNU ld is doing is better than what lld does; it's
merely an observation. :-)</pre>
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