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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 --- - __bases and __direct_bases intrinsics are not supported (N2965)" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23915&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=9U2BS6LqFQndPgZxIIkHbY7JRU2UsOfmcv5s2jG8_HQ&s=nQ0_srkE_Ql1V4bDSPScVbbOKsDCZkVOi-r3TG5_6j0&e=">23915</a>
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<th>Summary</th>
<td>__bases and __direct_bases intrinsics are not supported (N2965)
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>alexfrolov1878@yandex.ru
</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>Clang cannot compile GCC header tr2/type_traits (see below).
Type traits "bases" and "direct_bases" were proposed as N2965 for C++11
standard, but were not included.
The feature is well-documented (see
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.open-2Dstd.org_jtc1_sc22_wg21_docs_papers_2009_n2965.html&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=9U2BS6LqFQndPgZxIIkHbY7JRU2UsOfmcv5s2jG8_HQ&s=j9f2pq79Lss_R9B8rj7yLFgeQ5ELoRRDBFRzmkW7pX0&e=">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2965.html</a>) and is
supported by GCC.
There are some questions and requests regarding this feature on developer
forums (for example,
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__stackoverflow.com_questions_18435001_what-2Dis-2Dthe-2Dstatus-2Dof-2Dn2965-2Dstdbases-2Dand-2Dstddirect-2Dbases&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=9U2BS6LqFQndPgZxIIkHbY7JRU2UsOfmcv5s2jG8_HQ&s=EDUMG6bqOMSZlGXBCoAmf40M_Grr1kF0TsvLkCf_Ij4&e=">http://stackoverflow.com/questions/18435001/what-is-the-status-of-n2965-stdbases-and-stddirect-bases</a>).
$ clang --version
clang version 3.7.0 (trunk)
Target: x86_64-unknown-linux-gnu
Thread model: posix
$ cat test.cpp
#include <tr2/type_traits>
$ clang -std=c++11 -c test.cpp
In file included from test.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/tr2/type_traits:90:45:
error: '_Tp' does not refer to a value
typedef __reflection_typelist<__bases(_Tp)...> type;
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/tr2/type_traits:87:21:
note: declared here
template<typename _Tp>
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/tr2/type_traits:97:52:
error: '_Tp' does not refer to a value
typedef __reflection_typelist<__direct_bases(_Tp)...> type;
^
/usr/lib/gcc/x86_64-redhat-linux/4.8.2/../../../../include/c++/4.8.2/tr2/type_traits:94:21:
note: declared here
template<typename _Tp>
^
2 errors generated.
As you can see, Clang does not support __bases and __direct_bases intrinsics.
Alexey Frolov
=============
Software Engineer
Intel Compiler Team
Intel</pre>
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