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<base href="https://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Assertion `Val && "isa<> used on a null pointer"' failed while linking LTO objects (recent regression)"
href="https://llvm.org/bugs/show_bug.cgi?id=30344">30344</a>
</td>
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<tr>
<th>Summary</th>
<td>Assertion `Val && "isa<> used on a null pointer"' failed while linking LTO objects (recent regression)
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bero@lindev.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=17236" name="attach_17236" title="IR code producing the assert">attachment 17236</a> <a href="attachment.cgi?id=17236&action=edit" title="IR code producing the assert">[details]</a></span>
IR code producing the assert
Using llvm and clang svn rev. 281115 (3.9.0 release is ok), building
networkmanager-qt with lto enabled (both -flto and -flto=thin produce the
error) results in
ld: ../include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<llvm::GlobalAlias, const llvm::GlobalValue *>::doit(const
>From *) [To = llvm::GlobalAlias, From = const llvm::GlobalValue *]: Assertion
`Val && "isa<> used on a null pointer"' failed.
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: linker command failed due to signal (use -v to see
invocation)
The error is reproducible when using just one of the object files generated
earlier (attached).
$ clang -fPIC -flto -shared -o test.so device.cpp.o
ld: ../include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<llvm::GlobalAlias, const llvm::GlobalValue *>::doit(const
>From *) [To = llvm::GlobalAlias, From = const llvm::GlobalValue *]: Assertion
`Val && "isa<> used on a null pointer"' failed.
clang-4.0: error: unable to execute command: Aborted (core dumped)
clang-4.0: error: linker command failed due to signal (use -v to see
invocation)</pre>
</div>
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