C++ - C++0x/C++11 Support in GCC

C++0x was the working name of the ISO C++ 2011 standard, which introduced a host of new features into the standard C++ language and library. This project sought to implement new C++11 features in GCC, and made it the first compiler to bring feature-complete C++11 to C++ programmers.

C++11 features are available as part of the "mainline" GCC compiler in the trunk of GCC's Subversion repository and in GCC 4.3 and later. To enable C++0x support, add the command-line parameter -std=c++0x to your g++ command line. Or, to enable GNU extensions in addition to C++0x extensions, add -std=gnu++0x to your g++ command line. GCC 4.7 and later support -std=c++11 and -std=gnu++11 as well.

Important: GCC's support for C++11 is still experimental. Some features were implemented based on early proposals, and no attempt will be made to maintain backward compatibility when they are updated to match the final C++11 standard.

C++11 Language Features

The following table lists new language features that have been accepted into the C++11 standard. The "Proposal" column provides a link to the ISO C++ committee proposal that describes the feature, while the "Available in GCC?" column indicates the first version of GCC that contains an implementation of this feature (if it has been implemented).

For information about C++11 support in a specific version of GCC, please see:

• GCC 4.3 C++0x Status
• GCC 4.4 C++0x Status
• GCC 4.5 C++0x Status
• GCC 4.6 C++0x Status
• GCC 4.7 C++11 Status
• GCC 4.8 C++11 Status

Language Feature	Proposal	Available in GCC?	SD-6 Feature Test
Rvalue references	N2118	GCC 4.3	__cpp_rvalue_references >= 200610
Rvalue references for *this	N2439	GCC 4.8.1	__cpp_ref_qualifiers >= 200710
Initialization of class objects by rvalues	N1610	Yes
Non-static data member initializers	N2756	GCC 4.7	__cpp_nsdmi >= 200809
Variadic templates	N2242	GCC 4.3	__cpp_variadic_templates >= 200704
Extending variadic template template parameters	N2555	GCC 4.4
Initializer lists	N2672	GCC 4.4	__cpp_initializer_lists >= 200806
Static assertions	N1720	GCC 4.3	__cpp_static_assert >= 200410
auto-typed variables	N1984	GCC 4.4
Multi-declarator auto	N1737	GCC 4.4
Removal of auto as a storage-class specifier	N2546	GCC 4.4
New function declarator syntax	N2541	GCC 4.4
New wording for C++0x lambdas	N2927	GCC 4.5	__cpp_lambdas >= 200907
Declared type of an expression	N2343	GCC 4.3	__cpp_decltype >= 200707
decltype and call expressions	N3276	GCC 4.8.1
Right angle brackets	N1757	GCC 4.3
Default template arguments for function templates	DR226	GCC 4.3
Solving the SFINAE problem for expressions	DR339	GCC 4.4
Template aliases	N2258	GCC 4.7	__cpp_alias_templates >= 200704
Extern templates	N1987	Yes
Null pointer constant	N2431	GCC 4.6
Strongly-typed enums	N2347	GCC 4.4
Forward declarations for enums	N2764	GCC 4.6
Generalized attributes	N2761	GCC 4.8	__cpp_attributes >= 200809; __has_cpp_attribute(noreturn) >= 200809; __has_cpp_attribute(carries_dependency) == 0 (not implemented)
Generalized constant expressions	N2235	GCC 4.6	__cpp_constexpr >= 200704
Alignment support	N2341	GCC 4.8
Delegating constructors	N1986	GCC 4.7	__cpp_delegating_constructors >= 200604
Inheriting constructors	N2540	GCC 4.8	__cpp_inheriting_constructors >= 200802
Explicit conversion operators	N2437	GCC 4.5
New character types	N2249	GCC 4.4	__cpp_unicode_characters >= 200704
Unicode string literals	N2442	GCC 4.5	__cpp_unicode_literals >= 200710
Raw string literals	N2442	GCC 4.5	__cpp_raw_strings >= 200710
Universal character name literals	N2170	GCC 4.5
User-defined literals	N2765	GCC 4.7	__cpp_user_defined_literals >= 200809
Standard Layout Types	N2342	GCC 4.5
Defaulted and deleted functions	N2346	GCC 4.4
Extended friend declarations	N1791	GCC 4.7
Extending sizeof	N2253	GCC 4.4
Inline namespaces	N2535	GCC 4.4
Unrestricted unions	N2544	GCC 4.6
Local and unnamed types as template arguments	N2657	GCC 4.5
Range-based for	N2930	GCC 4.6	__cpp_range_based_for >= 200907
Explicit virtual overrides	N2928 N3206 N3272	GCC 4.7
Minimal support for garbage collection and reachability-based leak detection	N2670	No
Allowing move constructors to throw [noexcept]	N3050	GCC 4.6
Defining move special member functions	N3053	GCC 4.6
Concurrency
Sequence points	N2239	Yes
Atomic operations	N2427	GCC 4.4
Strong Compare and Exchange	N2748	GCC 4.5
Bidirectional Fences	N2752	GCC 4.8
Memory model	N2429	GCC 4.8
Data-dependency ordering: atomics and memory model	N2664	GCC 4.4 (memory_order_consume)
Propagating exceptions	N2179	GCC 4.4
Abandoning a process and at_quick_exit	N2440	GCC 4.8
Allow atomics use in signal handlers	N2547	Yes
Thread-local storage	N2659	GCC 4.8
Dynamic initialization and destruction with concurrency	N2660	GCC 4.3
C99 Features in C++11
__func__ predefined identifier	N2340	GCC 4.3
C99 preprocessor	N1653	GCC 4.3
long long	N1811	GCC 4.3
Extended integral types	N1988	Yes

C++11 Library Features

The status of the library implementation can be tracked in this table