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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 - fatal error: error in backend: Wasm COMDATs only support SelectionKind:Any, 'function' cannot be lowered"
href="https://bugs.llvm.org/show_bug.cgi?id=34901">34901</a>
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<th>Summary</th>
<td>fatal error: error in backend: Wasm COMDATs only support SelectionKind:Any, 'function' cannot be lowered
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>mark@chavfreezone.me.uk
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</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=19258" name="attach_19258" title="preprocessed source and associated run script">attachment 19258</a> <a href="attachment.cgi?id=19258&action=edit" title="preprocessed source and associated run script">[details]</a></span>
preprocessed source and associated run script
Testing the wasm32-unknown-unknown-wasm target in an attempt to see how stable
the wasm backend is with a test case, but get the following error:
fatal error: error in backend: Wasm COMDATs only support SelectionKind::Any,
'_ZN16PermutationTable7SetSeedEi' cannot
be lowered.
clang.exe: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version is 6.0.0 (trunk 314790) (llvm/trunk 315211)
Context:
The test case I wrote was in relation to the issue I raised here:
<a href="https://github.com/WebAssembly/binaryen/issues/1215">https://github.com/WebAssembly/binaryen/issues/1215</a> in relation to the startup
functions being exported with periods in their names which rendered them
unaccessible in the browser.
The code is stable when I add a main function and compile to it an exe on
windows, and if I have clang output the bitcode and pass it through llc, s2wasm
and wat2wasm I get a usable .wasm file (ignoring the fact that the startup
function isn't accessible so all the GetPermAt function returns is 0s).
Commands to produce the .wasm file from bitcode are below:
<span class="quote">> clang -c -v --target=wasm32 -std=c++14 -emit-llvm -Oz main.cpp
> llc -O2 main.bc -o main.s
> s2wasm main.s > main.wat
> wat2wasm main.wat -o main.wasm</span ></pre>
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