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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Builtin prototypes are implicitly defined"
href="https://bugs.llvm.org/show_bug.cgi?id=34557">34557</a>
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<th>Summary</th>
<td>Builtin prototypes are implicitly defined
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>joerg@NetBSD.org
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>A common way to do autoconf-style tests for declarations in headers uses the
following approach:
int main(void) { (void)strlcpy; return 0; }
This should fail with unknown identifier errors, but currently passes with a
implicit prototype warning for GNUish language modes (i.e. gnu89, gnu99 etc).
It fails for "unknown" identifiers like strlcpy2. This is a pretty bad error as
it can lead to incorrect autodetection of system headers.</pre>
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