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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 - Clang incorrectly considers dllimport pointers to member functions to be valid constant initializers"
href="https://bugs.llvm.org/show_bug.cgi?id=33570">33570</a>
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<th>Summary</th>
<td>Clang incorrectly considers dllimport pointers to member functions to be valid constant initializers
</td>
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<th>Product</th>
<td>clang
</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>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
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Consider:
struct __declspec(dllimport) Foo { void f(); };
auto global_fp = &Foo::f;
This generates the following LLVM IR global:
declare dllimport void @"\01?f@Foo@@QEAAXXZ"(%struct.Foo*) #0
@"\01?global_fp@@3P8Foo@@EAAXXZEQ1@" = global i8* bitcast (void (%struct.Foo*)*
@"\01?f@Foo@@QEAAXXZ" to i8*), align 8
This means that 'global_fp' will contain the import thunk for Foo::f, and not
the actual address of Foo::f in the DLL that exports it.
This is basically another instance of
<a href="https://bugs.llvm.org//show_bug.cgi?id=20130">https://bugs.llvm.org//show_bug.cgi?id=20130</a>.
The solution is to teach Sema that a dllimported member function pointer is not
constant, and to emit a dynamic initializer instead.</pre>
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