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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - preprocessor should warn on #include_next with a filename different from the including name" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23750&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=z9a5jae6zzVuEA2m-jHlnHQWCQf42J9GeLcVXVOW6a4&s=l1EsniSR9K3Utsc7DUjKOxZXwtr2jGfBjGhKmYfxkq8&e=">23750</a>
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<th>Summary</th>
<td>preprocessor should warn on #include_next with a filename different from the including name
</td>
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<th>Product</th>
<td>clang
</td>
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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>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Suppose:
main.cpp:
#include "foo/bar.h"
foo/bar.h:
#pragma once // or an include guard
#include_next "bar.h"
baz/bar.h:
extern int n;
... and we compile main.cpp with -Ifoo -Ibaz:
main.cpp includes foo/bar.h
foo/bar.h includes *itself*
Note that baz/bar.h is never included, and confusion reigns.
We should issue a warning if a file issues a #include_once with a name that
would not have found that same file in the starting search directory for the
#include_next search (that is, if the includer used the wrong name for the
file).</pre>
</div>
</p>
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