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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 - Make ld.lld repeat undefined symbol message only once for each undefined symbol"
href="https://bugs.llvm.org/show_bug.cgi?id=42260">42260</a>
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<th>Summary</th>
<td>Make ld.lld repeat undefined symbol message only once for each undefined symbol
</td>
</tr>
<tr>
<th>Product</th>
<td>lld
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<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>
</tr>
<tr>
<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>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, peter.smith@linaro.org
</td>
</tr></table>
<p>
<div>
<pre>If there are multiple references to an undefined symbol, lld-link prints only
one error line and then list all symbols. This is a nice feature and makes the
output more concise:
$ cat test.cc
int f();
void g() { f(); }
void h() { f(); }
void j() { f(); }
$ out/gn/bin/clang-cl /Zi test.cc -fuse-ld=lld /link /dll /noentry
/nodefaultlib
lld-link: error: undefined symbol: int __cdecl f(void)
<span class="quote">>>> referenced by /Users/thakis/src/chrome/src/test.cc:2
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-96be76.obj:(void __cdecl g(void))
>>> referenced by /Users/thakis/src/chrome/src/test.cc:3
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-96be76.obj:(void __cdecl h(void))
>>> referenced by /Users/thakis/src/chrome/src/test.cc:4
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-96be76.obj:(void __cdecl j(void))</span >
clang: error: linker command failed with exit code 1 (use -v to see invocation)
The ELF port isn't able to do this:
$ out/gn/bin/clang --target=x86_64-linux -nostartfiles -nodefaultlibs test.cc
-fuse-ld=lld -g
ld.lld: error: undefined symbol: f()
<span class="quote">>>> referenced by test.cc:2
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-a3c919.o:(g())</span >
ld.lld: error: undefined symbol: f()
<span class="quote">>>> referenced by test.cc:3
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-a3c919.o:(h())</span >
ld.lld: error: undefined symbol: f()
<span class="quote">>>> referenced by test.cc:4
>>> /var/folders/c5/8d7sdn1x2mg92mj0rndghhdr0000gn/T/test-a3c919.o:(j())</span >
clang: error: linker command failed with exit code 1 (use -v to see invocation)
We should teach it the same trick.</pre>
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