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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 --- - __has_include seems to be broken under #ifdef"
href="http://llvm.org/bugs/show_bug.cgi?id=15539">15539</a>
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<th>Summary</th>
<td>__has_include seems to be broken under #ifdef
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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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>
</tr>
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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>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>dblaikie@gmail.com
</td>
</tr>
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<th>Reporter</th>
<td>dblaikie@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>#if FOO
#elif __has_include(<foo>)
#endif
compiles without error, however
#ifdef FOO
#elif __has_include(<foo>)
#endif
produces:
typeinfo.cpp:2:7: error: __has_include must be used within a preprocessing
directive
#elif __has_include(<foo>)
^
typeinfo.cpp:2:7: error: invalid token at start of a preprocessor expression
<scratch space>:2:1: note: expanded from here
0
^
2 errors generated.
(discovered in a change to libc++, r177297)</pre>
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