<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 - Error when passing 0 args to a variadic macro parameters with `-std=c++20 -pedantic-errors`"
href="https://bugs.llvm.org/show_bug.cgi?id=51609">51609</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Error when passing 0 args to a variadic macro parameters with `-std=c++20 -pedantic-errors`
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>12.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>blckcat@inbox.ru
</td>
</tr>
<tr>
<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>Starting from C++20, it's allowed to pass 0 arguments to the variadic macro
parameter.
I.e. following should be allowed:
#define FOO(x, ...)
FOO(42)
Clang successfully compiles it by default, but if you add `-std=c++20
-pedantic-errors`, it starts (incorrectly) complaining:
error: must specify at least one argument for '...' parameter of variadic
macro [-Werror,-Wgnu-zero-variadic-macro-arguments]
`-pedantic-errors` should only enable this diagnostic in C++17 and earlier.</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>