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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 - BugPoint tests are failing when compiled with LTO"
href="https://bugs.llvm.org/show_bug.cgi?id=51230">51230</a>
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<th>Summary</th>
<td>BugPoint tests are failing when compiled with LTO
</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>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>MachO
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>phosek@chromium.org
</td>
</tr>
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<th>CC</th>
<td>gkm@fb.com, jezreel@gmail.com, llvm-bugs@lists.llvm.org, smeenai@fb.com
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<p>
<div>
<pre>I tried enabling the use of ld64.lld in our toolchain build that uses (regular)
LTO but I see a number of BugPoint tests failure which all looks the same:
```
Error opening
'/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib':
dlopen(/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib,
9): Symbol not found: __ZNK4llvm4Pass11getPassNameEv
Referenced from:
/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib
Expected in: flat namespace
in
/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/lib/BugpointPasses.dylib
-load request ignored.
bugpoint: Unknown command line argument '-bugpoint-crashcalls'. Try:
'/opt/s/w/ir/x/w/staging/llvm_build/tools/clang/stage2-bins/bin/bugpoint
--help'
bugpoint: Did you mean '--print-after-all'?
```
I suspect it's related to the use of -flat_namespace, see
<a href="https://github.com/llvm/llvm-project/blob/e69a8c42135606e60446d5e78144357a9e429c77/llvm/cmake/modules/HandleLLVMOptions.cmake#L174">https://github.com/llvm/llvm-project/blob/e69a8c42135606e60446d5e78144357a9e429c77/llvm/cmake/modules/HandleLLVMOptions.cmake#L174</a>,
which should be supported under LTO according to
<a href="https://github.com/llvm/llvm-project/blob/d7d2e4545e6b04ea29ffd05ebef2f7c26590b925/lld/MachO/LTO.cpp#L83">https://github.com/llvm/llvm-project/blob/d7d2e4545e6b04ea29ffd05ebef2f7c26590b925/lld/MachO/LTO.cpp#L83</a>
but perhaps it doesn't behave the same way as ld64?</pre>
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