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<h1>C++ and C++'0x Support in Clang</h1>
<!--*************************************************************************-->
<p>Last updated: $Date$</p>
<ul>
<li><a href="#projects">Projects Building with Clang</a></li>
<li><a href="#specification">Implementation Status by Section</a></li>
<li><a href="#cxx0x">C++0x Status</a></li>
</ul>
<p>Clang currently implements all of the ISO C++ 1998 standard (including
the defects addressed in the ISO C++ 2003 standard) except for 'export'
(which has been removed from the C++'0x draft).
The <a href="http://llvm.org/bugs/">LLVM bug tracker</a>
contains a Clang C++ component that tracks known Clang C++ bugs.</p>
Douglas Gregor
committed
<h2 id="projects">Projects Building with Clang</h2>
<p>Clang is now capable of compiling large C++ projects, and the following
table describes various projects that we have attempted to compile with
Clang++.</p>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Project</th>
<th>Status</th>
<th>Last Tested</th>
<th>Tracking Bug</th>
</tr>
<tr>
<td><a href="http://clang.llvm.org">Clang</a> and <a href="http://llvm.org">LLVM</a></td>
<td>Successful self-hosting achieved</td>
<td>Continually</td>
<td></td>
</tr>
Douglas Gregor
committed
<tr>
<td><a href="http://www.cmake.org">CMake</a></td>
<td>Compiles, passes regression tests (debug build)</td>
<td>February 9, 2010</td>
<td></td>
</tr>
<tr>
<td><a href="http://www.boost.org">Boost</a></td>
<td><a href="http://blog.llvm.org/2010/05/clang-builds-boost.html">Compiles
and passes regression tests</a> on Darwin/X86-64.</td>
<td>May 20, 2010</td>
<td><a href="http://llvm.org/bugs/show_bug.cgi?id=6023"><del>PR6023</del></a></td>
Douglas Gregor
committed
<tr>
<td>Partially compiles; miscompilation of uic prevents complete compilation, qmake works, some small examples also.</td>
Douglas Gregor
committed
<td>February 9, 2010</td>
<td><a href="http://llvm.org/bugs/show_bug.cgi?id=5881">PR5881</a></td>
</tr>
<h2 id="cxx0x">C++0x Implementation status</h2>
<p>Clang's development effort is focused primarily on fixing bugs in the current
ISO C++ standard (1998/2003). This section tracks the status of various C++0x
<h2 id="specification">Implementation Status by Feature</h2>
<!-- Within this table: The colors we're using to color-code our level
of support for a given section:
White (no background): not considered/tested.
#C11B17: Broken.
#F88017: Some useful examples work
#FDD017: Many examples work
#347C17: Nearly everything works
#00FF00 + check mark: Implementation complete!
-->
<p>The following table is used to help track our implementation
progress toward implementing the complete C++'0x standard. We use a
simple, somewhat arbitrary color-coding scheme to describe the
relative completeness of features:</p>
<table width="689" border="1" cellspacing="0">
<tr>
<th>Not started/not evaluated</th>
<th>Not Applicable</th>
<th>Broken</th>
<th>Some examples work</th>
<th>Many examples work</th>
<th>Nearly everything works</th>
<th>Complete</th>
<!--
<th>Complete (with tests for each paragraph)</th>
-->
</tr>
<tr>
<td></td>
<td class="na">N/A</td>
<td class="broken"></td>
<td class="basic"></td>
<td class="medium"></td>
<td class="advanced"></td>
<td class="complete">rXXXXXX</td>
<!--
<td class="complete" align="center">✓</td>
-->
<p>In addition, boxes marked with ✓ have complete and passing tests.
Similarly, boxes marked with ✗ have complete tests, some of which
are failing, and a <b>?</b> indicates partial tests while not making any
statement about passing status.</p>
<p>A feature is "complete" when the appropriate Clang component (Parse, AST,
Sema, CodeGen) implements the behavior described in all of the
paragraphs in the relevant C++'0x draft standard. The major
components are:</p>
<dd>Clang is able to parse the grammar of this feature (or the grammar
described by this section), but does not necessarily do anything with the
parsed result. Use Clang's <code>-fsyntax-only</code> option to parse C++
programs.</dd>
<dd>Clang builds an abstract syntax tree (AST) for the feature, but does not
necessarily perform any type-checking. Use Clang's <code>-ast-print</code>
option to print the resulting ASTs.</dd>
<dd>Clang parses and type-checks this feature and provides a well-formed AST
annotated with types. Use Clang's <code>-fsyntax-only</code> to type-check
code.</dd>
<dd>Clang parses, type-checks, and generates code for this feature, allowing
one to compile and execute programs.</dd>
<p>Updates to this table are welcome! Tests for the various features are also
welcome!</p>
<table width="689" border="1" cellspacing="0">
<tr><td colspan="7" align="center" bgcolor="#ffddaa">C++0x Features (current draft report <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3225.pdf">here</a>) </td>
<th>Parse</th>
<th>AST</th>
<th>Sema</th>
<th>CodeGen</th>
<th>Standard Sections</th>
<tr><td colspan="7" class="category">Control Flow Modifications</td></tr>
<tr>
<td>Range-based for loop</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>6.5.4</td>
<td><a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2007/n2243.html">N2243</a></td>
</tr>
<tr><td colspan="7" class="category">Type System Modifications</td></tr>
<td>rvalue references</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete"></td>
<td>8.3.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2118.html">N2118</a>,
<a href="http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2009/n2831.html">N2831</a> <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2439.htm">N2439</a>
</td>
<td>decltype</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">✓</td>
<td>7.1.6.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2343.pdf">N2343</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1478.pdf">N1478</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1978.pdf">N1978</a>
</td>
</tr>
<tr>
<td>auto type deduction</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td>7.1.6.2, 7.1.6.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1984.pdf">N1984</a></td>
<td>nullptr</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="broken"></td>
<td>2.14.7, 4.10, 4.11</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2431.pdf">N2431</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1488.pdf">N1488</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2214.pdf">N2214</a>
</td>
</tr>
<tr>
<td>enum classes</td>
<td class="complete"></td>
<td class="advanced"></td>
<td class="advanced"></td>
<td>7.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1513.pdf">N1513</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf">N2347</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2499.pdf">N2499</a>
Includes forward declaration capability
</td>
<td>long long</td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td>3.9.1</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1811.pdf">N1811</a>
</td>
</tr>
<tr>
<td>constexpr</td>
<td></td>
<td></td>
<td></td>
<td>3.6.2, 3.9, 5.19, 7.1.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1521.pdf">N1521</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2235.pdf">N2235</a>
</td>
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
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299
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302
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304
305
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309
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311
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401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
<td>char16_t/char32_t</td>
<td class="medium"></td>
<td class="medium"></td>
<td class="medium"></td>
<td class="medium"></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2249.html">N2249</a></td>
</tr>
<tr>
<td>Unicode string literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.3, 2.14.5</td>
<td></td>
</tr>
<tr>
<td>Raw string literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2053.html">N2053</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2442.html">N2442</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2378.pdf">N2378</a>
</td>
</tr>
<tr>
<td>user-defined literal types</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>2.14.8</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2378.pdf">N2378</a></td>
</tr>
<tr>
<td>POD defintion changes</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>3.9, 9</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2294.html">N2294</a></td>
</tr>
<tr>
<td>Unrestricted unions</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>9.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2544.pdf">N2544</a></td>
</tr>
<tr>
<td>Tighter narrowing rules</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>8.5.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1890.pdf">N1890</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2215.pdf">N2215</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2640.pdf">N2640</a>
</td>
</tr>
<tr><td colspan="7" class="category">Class Modifications</td></tr>
<tr>
<td>delegating constructors</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.6.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1986">N1986</a></td>
</tr>
<tr>
<td>inheriting constructors</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.9</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1890.pdf">N1890</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1898.pdf">N1898</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2512.html">N2512</a>
</td>
</tr>
<tr>
<td>In-declaration member initialization</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2628.html">N2628</a></td>
</tr>
<tr>
<td>Changes to implicitly generated methods</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>Includes implicit generation of move operations</td>
</tr>
<tr>
<td>defaulted methods</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1717.pdf">N1717</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2326.html">N2326</a>
</td>
</tr>
<tr>
<td>destructor defaults to noexcept</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>sizeof on members without object instance</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2150.html">N2150</a></td>
</tr>
<tr>
<td>virtual function safety modifications</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Explicit conversion operators</td>
<td class="complete" align="center"></td>
<td class="basic" align="center"></td>
<td class="basic" align="center"></td>
<td>12.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2437.pdf">N2437</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2333.html">N2333</a>
No name mangling; ASTs don't contain calls to conversion operators</td>
<tr><td colspan="7" class="category">Template Modifications</td></tr>
<tr>
<td>Right angle brackets</td>
<td class="complete" align="center"></td>
<td class="na" align="center">N/A</td>
<td class="na" align="center">N/A</td>
<td class="na">N/A</td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1757.html">N1757</a></td>
</tr>
<td>variadic templates</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td>14.6.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2080.pdf">N2080</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n2087.pdf">N2087</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2242.pdf">N2242</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2488.pdf">N2488</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2555.pdf">N2555</a>
</td>
</tr>
<tr>
<td>template aliases</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>7.1.3, 14.6.7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2003/n1489.pdf">N1489</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2258.pdf">N2258</a>
Includes non-template type aliasing
</td>
</tr>
<tr>
<td>Removal of export</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td></td>
<td>This was never implemented in C++03</td>
</tr>
<tr>
<td>extern templates</td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td class="complete"></td>
<td>14.8.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1987.htm">N1987</a></td>
<td>Local classes as template parameters</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2402.pdf">N2402</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2657.htm">N2657</a>
</td>
</tr>
<tr><td colspan="7" class="category">Exception Modifications</td></tr>
<tr>
<td>Deprecation of exception specifications</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>15.4</td>
<td></td>
</tr>
<tr>
<td>noexcept</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">✓</td>
<td class="na">N/A</td>
<td>5.3.7, 15.4</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3050.html">N3050</a></td>
</tr>
<tr><td colspan="7" class="category">Preprocessor Modifications</td></tr>
<tr>
<td>__STDC_HOSTED__</td>
<td class="complete"></td>
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.8</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>_Pragma</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.9</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>Variable argument macros</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.3</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>Empty macro arguments</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.3</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>__func__</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>8.4.1</td>
<td>C99
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1568.htm">N1568</a>
</td>
</tr>
<tr>
<td>__cplusplus</td>
<td class="complete"></td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td class="na">N/A</td>
<td>16.8</td>
<td></td>
</tr>
<tr><td colspan="7" class="category">Things Completely New</td></tr>
<tr>
<td>Late-specified return type</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>8.3.5</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2445.html">N2445</a></td>
</tr>
<tr>
<td>lambda expressions</td>
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
<td></td>
<td></td>
<td></td>
<td>5.1.2</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2006/n1968.htm">N1968</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2550.pdf">N2550</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2009/n2859.pdf">N2859</a>
</td>
</tr>
<tr>
<td>Uniform initializers </td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>12.6</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2215.pdf">N2215</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2640.pdf">N2640</a>
</td>
</tr>
<tr>
<td>Memory model</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td>1.7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2556.html">N2556</a></td>
<tr><td colspan="7" class="category">Miscellania</td></tr>
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
<td>Standard attribute syntax</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2418.pdf">N2418</a></td>
</tr>
<tr>
<td>alignment control</td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Deleted functions</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="medium" align="center"></td>
<td class="na">N/A</td>
<td>8.4.3</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2326.htm">N2326</a></br>
This also includes class methods.</td>
</tr>
<tr>
<td>static_assert</td>
<td class="complete" align="center"></td>
<td class="complete" align="center"></td>
<td class="advanced" align="center"></td>
<td class="na">N/A</td>
<td>7</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2002/n1381.htm">N1381</a>
<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2004/n1720.pdf">N1720</a>
</td>
</tr>
<tr>
<td>Inline namespaces</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">✓</td>
<td class="complete" align="center">N/A</td>
<td>7.3.1</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2535.htm">N2535</a></td>
</tr>
<tr>
<td>thread_local storage</td>
<td></td>
<td></td>
<td></td>
<td>3.7.2, 7.1.1</td>
<td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2660.htm">N2660</a></td>
<tr><td colspan="7" class="category">Standard Library Modifications, see <a href="http://libcxx.llvm.org/index.html">libc++</a> or <a href="http://gcc.gnu.org/onlinedocs/libstdc++/manual/bk01pt01ch01.html#manual.intro.status.standard.200x">libstdc++</a> or <a href="http://blogs.msdn.com/b/vcblog/archive/2010/07/02/video-introduction-to-the-stl-part-1.aspx">VC++ 2010</a></td></tr>