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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Constructor for template class codegen'd multiple times with dllexport explicit instantiation"
href="https://bugs.llvm.org/show_bug.cgi?id=47683">47683</a>
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<th>Summary</th>
<td>Constructor for template class codegen'd multiple times with dllexport explicit instantiation
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
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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>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>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>aeubanks@google.com
</td>
</tr>
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<th>CC</th>
<td>hans@chromium.org, htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, rnk@google.com
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<p>
<div>
<pre>$ cat /tmp/repro.cc
class a {
public:
a();
};
class b;
template <class> class c {
c() = default;
a d;
};
extern template class c<b>;
template class __declspec(dllexport) c<b>;
$ clang -cc1 -triple x86_64-pc-windows-msvc19.16.0 -fms-compatibility
-emit-llvm /tmp/repro.cc
clang: ../../clang/lib/CodeGen/CodeGenFunction.cpp:694: void
clang::CodeGen::CodeGenFunction::StartFunction(clang::GlobalDecl,
clang::QualType, llvm::Function *, const clang::CodeGen::CGFunctionInfo &,
const clang::CodeGen::FunctionArgList &, clang::SourceLocation,
clang::SourceLocation): Assertion `CurFn->isDeclaration() && "Function already
has body?"' failed.
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - "Function already has body?" assert on explicitly defaulted non-trivial dllexport ctor during explicit template instantiation"
href="show_bug.cgi?id=42857">https://bugs.llvm.org/show_bug.cgi?id=42857</a> seems related.</pre>
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