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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -Wempty-body false negative on NULL check"
href="http://llvm.org/bugs/show_bug.cgi?id=19785">19785</a>
</td>
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<tr>
<th>Summary</th>
<td>-Wempty-body false negative on NULL check
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>3.4
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Macintosh
</td>
</tr>
<tr>
<th>OS</th>
<td>MacOS X
</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>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>publicposting@lapcatsoftware.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>-Wempty-body false negatives for 3 and 4 below.
$ cat > empty.c
#include <stddef.h>
int main( int argc, const char **argv )
{
if ( !argv );
return 1;
if ( argv );
return 2;
if ( argv == NULL );
return 3;
if ( argv != NULL );
return 4;
if ( NULL == argv );
return 5;
if ( NULL != argv );
return 6;
return 0;
}
$ clang -Wempty-body empty.c
empty.c:5:14: warning: if statement has empty body [-Wempty-body]
if ( !argv );
^
empty.c:5:14: note: put the semicolon on a separate line to silence this
warning
empty.c:8:13: warning: if statement has empty body [-Wempty-body]
if ( argv );
^
empty.c:8:13: note: put the semicolon on a separate line to silence this
warning
empty.c:17:21: warning: if statement has empty body [-Wempty-body]
if ( NULL == argv );
^
empty.c:17:21: note: put the semicolon on a separate line to silence this
warning
empty.c:20:21: warning: if statement has empty body [-Wempty-body]
if ( NULL != argv );
^
empty.c:20:21: note: put the semicolon on a separate line to silence this
warning
4 warnings generated.</pre>
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