C++98, C++11, and C++14 Support in Clang
Last updated: $Date$
C++98 implementation status
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 in C++11) and is considered a production-quality C++ compiler. The LLVM bug tracker contains a Clang C++ component that tracks known Clang C++ bugs.
C++11 implementation status
Clang implements all of the ISO C++ 2011 standard. The following table describes the Clang version in which each feature became available.
By default, Clang builds C++ code according to the C++98 standard, with many
C++11 features accepted as extensions. You can use Clang in C++11 mode with the
-std=c++11 option. Clang's C++11 mode can be used
with libc++ or with gcc's libstdc++, but
patches are needed to make libstdc++-4.4
work with Clang in C++11 mode. Patches are also needed to make
libstdc++-4.6,
and libstdc++-4.7 work with Clang
releases prior to version 3.2 in C++11 mode. thread_local support
currently requires g++-4.8's C++ runtime library.
| Language Feature | C++11 Proposal | Available in Clang? |
|---|---|---|
| Rvalue references | N2118 | Clang 2.9 |
Rvalue references for *this |
N2439 | Clang 2.9 |
| Initialization of class objects by rvalues | N1610 | Clang 2.9 |
| Non-static data member initializers | N2756 | Clang 3.0 |
| Variadic templates | N2242 | Clang 2.9 |
| Extending variadic template template parameters | N2555 | Clang 2.9 |
| Initializer lists | N2672 | Clang 3.1 |
| Static assertions | N1720 | Clang 2.9 |
auto-typed variables |
N1984 | Clang 2.9 |
Multi-declarator auto |
N1737 | Clang 2.9 |
| Removal of auto as a storage-class specifier | N2546 | Clang 2.9 |
| New function declarator syntax | N2541 | Clang 2.9 |
| Lambda expressions | N2927 | Clang 3.1 |
| Declared type of an expression | N2343 | Clang 2.9 |
| Incomplete return types | N3276 | Clang 3.1 |
| Right angle brackets | N1757 | Clang 2.9 |
| Default template arguments for function templates | DR226 | Clang 2.9 |
| Solving the SFINAE problem for expressions | DR339 | Clang 2.9 |
| Alias templates | N2258 | Clang 3.0 |
| Extern templates | N1987 | Clang 2.9 |
| Null pointer constant | N2431 | Clang 3.0 |
| Strongly-typed enums | N2347 | Clang 2.9 |
| Forward declarations for enums | N2764
DR1206 |
Clang 3.1 |
| Generalized attributes | N2761 | Clang 3.3 (1) |
| Generalized constant expressions | N2235 | Clang 3.1 |
| Alignment support | N2341 | Clang 3.3 |
| Delegating constructors | N1986 | Clang 3.0 |
| Inheriting constructors | N2540 | Clang 3.3 |
| Explicit conversion operators | N2437 | Clang 3.0 |
| New character types | N2249 | Clang 2.9 |
| Unicode string literals | N2442 | Clang 3.0 |
| Raw string literals | N2442 | Clang 3.0 |
| Universal character names in literals | N2170 | Clang 3.1 |
| User-defined literals | N2765 | Clang 3.1 |
| Standard Layout Types | N2342 | Clang 3.0 |
| Defaulted functions | N2346 | Clang 3.0 |
| Deleted functions | N2346 | Clang 2.9 |
| Extended friend declarations | N1791 | Clang 2.9 |
Extending sizeof |
N2253
DR850 |
Clang 3.1 |
| Inline namespaces | N2535 | Clang 2.9 |
| Unrestricted unions | N2544 | Clang 3.1 |
| Local and unnamed types as template arguments | N2657 | Clang 2.9 |
| Range-based for | N2930 | Clang 3.0 |
| Explicit virtual overrides | N2928
N3206 N3272 |
Clang 3.0 |
| Minimal support for garbage collection and reachability-based leak detection | N2670 | N/A |
| Allowing move constructors to throw [noexcept] | N3050 | Clang 3.0 |
| Defining move special member functions | N3053 | Clang 3.0 |
| Concurrency | ||
| Sequence points | N2239 | Clang 3.3 |
| Atomic operations | N2427 | Clang 3.1 |
| Strong Compare and Exchange | N2748 | Clang 3.1 (2) |
| Bidirectional Fences | N2752 | Clang 3.1 |
| Memory model | N2429 | Clang 3.2 |
| Data-dependency ordering: atomics and memory model | N2664 | Clang 3.2 (3) |
| Propagating exceptions | N2179 | Clang 2.9 |
| Abandoning a process and at_quick_exit | N2440 | N/A |
| Allow atomics use in signal handlers | N2547 | Clang 3.1 |
| Thread-local storage | N2659 | Clang 3.3 |
| Dynamic initialization and destruction with concurrency | N2660 | Clang 2.9 |
| C99 Features in C++11 | ||
__func__ predefined identifier |
N2340 | Clang 2.9 |
| C99 preprocessor | N1653 | Clang 2.9 |
long long |
N1811 | Clang 2.9 |
| Extended integral types | N1988 | N/A (4) |
(1): The [[carries_dependency]] attribute
has no effect.
(2): All compare-exchange operations are emitted as
strong compare-exchanges.
(3): memory_order_consume is lowered to
memory_order_acquire.
(4): __int128 is not treated as an extended
integer type, because changing intmax_t would be an
ABI-incompatible change.
C++1y implementation status
Clang is introducing support for the upcoming C++ language standard, provisionally named C++1y. The following table describes which C++1y features have been implemented in Clang and in which Clang version they became available.
You can use Clang in C++1y mode with the -std=c++1y option.
| Language Feature | C++1y Proposal | Available in Clang? |
|---|---|---|
| Tweak to certain C++ contextual conversions | N3323 | No |
| Binary literals | N3472 | Yes |
| decltype(auto) | N3638 | Clang 3.3 |
| Return type deduction for normal functions | Partial | |
| Runtime-sized arrays with automatic storage duration | N3639 | Partial |
| Initialized lambda captures | N3648 | No |
| Generic lambdas | N3649 | No [WIP] |
| Variable templates | N3651 | No |
| Relaxing requirements on constexpr functions | N3652 | Partial |
| Member initializers and aggregates | N3653 | Clang 3.3 |
| Clarifying memory allocation | N3664 | Yes |