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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 - __attribute__((__format__(printf()))) doesn't warn about NULL format string"
href="https://bugs.llvm.org/show_bug.cgi?id=34575">34575</a>
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<th>Summary</th>
<td>__attribute__((__format__(printf()))) doesn't warn about NULL format string
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>5.0
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>shabbyx@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Take this code:
#include <stdio.h>
int main()
{
printf(NULL, "x");
return 0;
}
gcc helpfully warns that:
<source>: In function 'int main()':
5 : <source>:5:19: warning: null argument where non-null required (argument
1) [-Wnonnull]
printf(NULL, "x");
^
5 : <source>:5:19: warning: too many arguments for format
[-Wformat-extra-args]
while clang doesn't say anything (it doesn't even warn about extra arguments).
It would be nice if it did.</pre>
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