<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Windows] __uuidof in a template parameter issue with MSVC abi"
href="https://bugs.llvm.org/show_bug.cgi?id=39881">39881</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[Windows] __uuidof in a template parameter issue with MSVC abi
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mike.winterberg@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Between r345380 and r346630 (likely, in r345692), in C++17 mode passing
__uuidof(X) to a template parameter started failing with the error "cannot yet
mangle expression type ConstantExpr" if the target is i386-pc-windows or
amd64-pc-windows.
Compiling this code:
typedef struct _GUID
{
unsigned long Data1;
unsigned short Data2;
unsigned short Data3;
unsigned char Data4[8];
} GUID;
struct __declspec(uuid("12345678-1234-1234-1234-123456789abc")) uuid;
template <const _GUID*>
struct baz {
};
baz<&__uuidof(uuid)> y;
as -std=c++17 -fms-extensions -target amd64-pc-windows results in this error:
uuidof.cc:12:5: error: cannot yet mangle expression type ConstantExpr
CE link just to show the effect of different flags:
<a href="https://gcc.godbolt.org/z/PXV4rO">https://gcc.godbolt.org/z/PXV4rO</a></pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>