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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 - Duplicated warning message in -Wcomma"
href="https://bugs.llvm.org/show_bug.cgi?id=46438">46438</a>
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</tr>
<tr>
<th>Summary</th>
<td>Duplicated warning message in -Wcomma
</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>Linux
</td>
</tr>
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<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>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>haoxintu@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
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<pre>This code, bug.cc, clang-9 to clang-trunk emit two duplicated warning message
"warning: possible misuse of comma operator here [-Wcomma]", while clang-6 to
clang-8 just give one warning message about this.
$cat bug.cc
const long var = 10;
static_assert (1 ? ( 0 , var ) : 0 , "" );
$clang++-trunk -Wcomma -c bug.cc
bug.cc:2:24: warning: possible misuse of comma operator here [-Wcomma]
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
bug.cc:2:22: note: cast expression to void to silence warning
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
static_cast<void>( )
bug.cc:2:24: warning: possible misuse of comma operator here [-Wcomma]
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
bug.cc:2:22: note: cast expression to void to silence warning
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
static_cast<void>( )
2 warnings generated.
$clang++-8 -Wcomma -c bug.cc
bug.cc:2:24: warning: possible misuse of comma operator here [-Wcomma]
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
bug.cc:2:22: note: cast expression to void to silence warning
static_assert (1 ? ( 0 , var ) : 0 , "" );
^
static_cast<void>( )
1 warning generated.</pre>
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</p>
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