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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 --- - Linking against macOS prebuilt binaries causes linker warnings around std::__1::__call_once_proxy"
href="https://llvm.org/bugs/show_bug.cgi?id=31782">31782</a>
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<th>Summary</th>
<td>Linking against macOS prebuilt binaries causes linker warnings around std::__1::__call_once_proxy
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>4.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>URL</th>
<td>https://github.com/zneak/fcd/tree/llvm-4.0
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Core LLVM classes
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>felixcca@yahoo.ca
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mehdi.amini@apple.com
</td>
</tr>
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<th>Blocks</th>
<td>31622
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>I've upgraded a project (see bug URL) to LLVM 4.0. It seems to work, but I get
over 200 linker warnings of the following format:
<span class="quote">> ld: warning: direct access in function 'llvm::initializeExternalAAWrapperPassPass(llvm::PassRegistry&)' from file '/Users/.../Projets/clang+llvm-4.0.0-rc1-x86_64-apple-darwin/lib/libLLVMAnalysis.a(AliasAnalysis.cpp.o)' to global weak symbol 'void std::__1::__call_once_proxy<std::__1::tuple<void* (&)(llvm::PassRegistry&), std::__1::reference_wrapper<llvm::PassRegistry>&&> >(void*)' from file '/Users/.../Library/Developer/Xcode/DerivedData/fcd-aagtzwcwgbftbkcrfnkqbgvqpfbm/Build/Intermediates/.../Objects-normal/x86_64/foo.o' means the weak symbol cannot be overridden at runtime. This was likely caused by different translation units being compiled with different visibility settings.</span >
The constant is __call_once_proxy.
I am building my project using the libc++ version that ships with Xcode 8.2.1.
The project didn't have any of these warnings when linking against the prebuilt
LLVM 3.9.</pre>
</div>
</p>
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