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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang-cl and cl disagree about the mangling of functions taking variadic templates"
href="http://llvm.org/bugs/show_bug.cgi?id=21888">21888</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang-cl and cl disagree about the mangling of functions taking variadic templates
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++11
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This program fails to link if one half is compiled with clang-cl but the other
is compiled with cl:
C:\src\chromefetch\src> type tmp.cc
template <typename... Ts>
struct Tuple {
Tuple() {}
};
using Tuple0 = Tuple<>;
class Message;
class SyncChannelTestMsg_AnswerToLife {
public:
static bool ReadSendParam(const Message* msg, Tuple0* p);
};
#ifdef FOO
bool SyncChannelTestMsg_AnswerToLife::ReadSendParam(
const Message* msg, Tuple0* p) {
return true;
}
#else
int main() {
SyncChannelTestMsg_AnswerToLife::ReadSendParam(nullptr, nullptr);
}
#endif
C:\src\chromefetch\src>cl tmp.cc /DFOO /c
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
tmp.cc
C:\src\chromefetch\src>..\..\llvm-rw-build-rel\bin\clang-cl.exe tmp.cc /c
/Fotmp2.obj
C:\src\chromefetch\src>cl /Fetmp.exe tmp.obj tmp2.obj
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
Microsoft (R) Incremental Linker Version 12.00.21005.1
Copyright (C) Microsoft Corporation. All rights reserved.
/out:tmp.exe
tmp.obj
tmp2.obj
tmp2.obj : error LNK2019: unresolved external symbol "public: static bool
__cdecl SyncChannelTestMsg_AnswerToLife::ReadSendParam(class Message const
*,struct Tuple<> *)"
(?ReadSendParam@SyncChannelTestMsg_AnswerToLife@@SA_NPBVMessage@@PAU?$Tuple@$$V@@@Z)
referenced in function _main
tmp.exe : fatal error LNK1120: 1 unresolved externals
C:\src\chromefetch\src>cl.exe tmp.cc /c /Fotmp2.obj
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
tmp.cc
C:\src\chromefetch\src>cl /Fetmp.exe tmp.obj tmp2.obj
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
Microsoft (R) Incremental Linker Version 12.00.21005.1
Copyright (C) Microsoft Corporation. All rights reserved.
/out:tmp.exe
tmp.obj
tmp2.obj
// cl /DFOO:
// tmp2.obj : error LNK2019: unresolved external symbol "public: static bool
__cdecl SyncChannelTestMsg_AnswerToLife::ReadSendParam(class Message const *
// ,struct Tuple<> *)"
(?ReadSendParam@SyncChannelTestMsg_AnswerToLife@@SA_NPBVMessage@@PAU?$Tuple@$$V@@@Z)
referenced in function _main
// clang-cl /DFOO:
// tmp1.obj : error LNK2019: unresolved external symbol "public: static bool
__cdecl SyncChannelTestMsg_AnswerToLife::ReadSendParam(class Message const *
// ,struct Tuple<> *)"
(?ReadSendParam@SyncChannelTestMsg_AnswerToLife@@SA_NPBVMessage@@PAU?$Tuple@$$$V@@@Z)
referenced in function _main
Note how clang produces $$V@@@Z while cl produces $$$V@@@Z -- cl has more
trailing dollars.</pre>
</div>
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