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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [-cxx-abi microsoft] Calling convention mismatch for operator new/delete and potentially others"
href="http://llvm.org/bugs/show_bug.cgi?id=17371">17371</a>
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<th>Summary</th>
<td>[-cxx-abi microsoft] Calling convention mismatch for operator new/delete and potentially others
</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>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu, richard-llvm@metafoo.co.uk
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This is a link error when building SupportTests with clang-cl /fallback.
The mismatch looks like this:
$ dumpbin /symbols lib/IR/CMakeFiles/LLVMCore.dir/User.cpp.obj
unittests/Support/CMakeFiles/SupportTests.dir/ValueHandleTest.cpp.obj | grep
'User::operator new'
14A 00000180 SECT1 notype () External | ??2User@llvm@@KEPAXII@Z
(protected: static void * __thiscall llvm::User::operator new(unsigned
int,unsigned int))
B9A 00000000 UNDEF notype () External | ??2User@llvm@@KAPAXII@Z
(protected: static void * __cdecl llvm::User::operator new(unsigned
int,unsigned int))
The key diff is __thiscall vs. __cdecl.
This is a bug in the calling convention change I committed. Since operator new
is declared in a record context, we assume it's __thiscall, even though it has
no this pointer. I assume we have a similar problem for delete, and maybe
other operators that I'm unaware of.</pre>
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