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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __has_attribute does not parse C++11 namespaced attributes"
href="http://llvm.org/bugs/show_bug.cgi?id=15853">15853</a>
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<th>Summary</th>
<td>__has_attribute does not parse C++11 namespaced attributes
</td>
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<th>Product</th>
<td>clang
</td>
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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
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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
</td>
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<th>Component</th>
<td>C++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>arcata@gmail.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Testing for a namespaced attribute with __has_attribute gives a parse error:
////
#if __has_attribute(clang::fallthrough)
#warning "clang::fallthrough supported"
#endif
////
----
foo.cpp:1:5: error: builtin feature check macro requires a parenthesized
identifier
#if __has_attribute(clang::fallthrough)
^
foo.cpp:1:26: error: invalid token at start of a preprocessor expression
#if __has_attribute(clang::fallthrough)
----
Testing with the un-namespaced name works:
////
#if __has_attribute(fallthrough)
#warning "fallthrough supported...somewhere"
#endif
////
----
#if __has_attribute(fallthrough)
#warning "fallthrough supported...somewhere"
#endif
----</pre>
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