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<base href="https://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 generates warnings if use preprocessed files."
href="https://llvm.org/bugs/show_bug.cgi?id=30529">30529</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang generates warnings if use preprocessed files.
</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>Linux
</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>yunlian@chromium.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>#define T(x) (x==1)
int main(){
int x = 1;
if (T(x)) {
return 0;}
return 1;
}
clang -Wall a.c returns no warning.
clang a.c -E > a.i
clang -Wall a.i
returns
a.c:5:9: warning: equality comparison with extraneous parentheses
[-Wparentheses-equality]
if ((x==1)) {
~^~~
a.c:5:9: note: remove extraneous parentheses around the comparison to silence
this warning
if ((x==1)) {
~ ^ ~
a.c:5:9: note: use '=' to turn this equality comparison into an assignment
if ((x==1)) {
^~
=
1 warning generated.</pre>
</div>
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