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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Missing -Wformat-extra-args warning when calling basename() in printf() argument"
href="https://bugs.llvm.org/show_bug.cgi?id=36972">36972</a>
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<th>Summary</th>
<td>Missing -Wformat-extra-args warning when calling basename() in printf() argument
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>bernie@codewiz.org
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>All versions of clang I tried did not warn about an extra printf argument in
the testcase below.
Fails in: clang 7.0.1, 5.0.1, 3.8.275480
Works in: gcc 7.3.0
Reduced testcase:
--------------------------------------------
#include <stdio.h>
#include <libgen.h> // basename()
int main(int argc, char** argv) {
// Fails to emit -Wformat-extra-args diagnostic
printf("too %s", "many", basename(argv[0]));
// Works as expected
printf("too %s", "many", __xpg_basename(argv[0]));
}
--------------------------------------------</pre>
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