<html>
<head>
<base href="http://llvm.org/bugs/" />
</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 --- - No -Wparentheses warning for "if (a += b)""
href="http://llvm.org/bugs/show_bug.cgi?id=19063">19063</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>No -Wparentheses warning for "if (a += b)"
</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>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chengniansun@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The clang trunk emits -Wparentheses warnings for "if (a |= b)" and "if(a = a +
b)", but not "if (a += b)"
$: cat s.c
int b;
int f(int a) {
if (a |= b)
return 3;
else if (a += b) /* <- no warning here*/
return 2;
else if (a = a + b)
return 4;
else
return 1;
}
$: clang-trunk -Wparentheses -c s.c
s.c:3:9: warning: using the result of an assignment as a condition without
parentheses [-Wparentheses]
if (a |= b)
~~^~~~
s.c:3:9: note: place parentheses around the assignment to silence this warning
if (a |= b)
^
( )
s.c:3:9: note: use '!=' to turn this compound assignment into an inequality
comparison
if (a |= b)
^~
!=
s.c:7:14: warning: using the result of an assignment as a condition without
parentheses [-Wparentheses]
else if (a = a + b)
~~^~~~~~~
s.c:7:14: note: place parentheses around the assignment to silence this warning
else if (a = a + b)
^
( )
s.c:7:14: note: use '==' to turn this assignment into an equality comparison
else if (a = a + b)
^
==
2 warnings generated.
$:</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>