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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - lld emits a misleading diagnostic"
href="https://bugs.llvm.org/show_bug.cgi?id=34872">34872</a>
</td>
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<th>Summary</th>
<td>lld emits a misleading diagnostic
</td>
</tr>
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<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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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>davide@freebsd.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>If you take the example in <a class="bz_bug_link
bz_status_NEW "
title="NEW - [InstCombine] miscompile of __builtin_fmod"
href="show_bug.cgi?id=34870">https://bugs.llvm.org/show_bug.cgi?id=34870</a> and link
with lld, you get two diagnostics.
[davide@localhost bin]$ ./clang fmod.c -O0 -fuse-ld=lld
/home/davide/work/llvm/build-release/bin/./ld.lld: error: undefined symbol:
fmod
<span class="quote">>>> referenced by fmod.c
>>> /tmp/fmod-208cee.o:(foo)</span >
/home/davide/work/llvm/build-release/bin/./ld.lld: error: symbol 'fmod' defined
in /tmp/fmod-208cee.o has no type
clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)
The first one, I guess is fine.
The second one, I'm not sure it's really good and/or informative. It doesn't
really matter that the symbol has no type *if* the link already failed because
it's undefined.
IMHO, once we emit a diag for undefined we're already in an unrecoverable state
and we should not emit other (unrelated) diagnostics for that symbol.</pre>
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