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The reason I'm asking is, that there are contradictory pieces of information on the web. On the one hand on isocpp.org it states that GCC 4.8.1 has the C++11 standard implemented completely. On the other hand the GCC C++11 support page states that there is no "Minimal support for garbage collection and reachability-based leak detection". So is GCC 4.8.1 really C++11 feature complete?
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Status of Experimental C++11 Support in GCC 4.8GCC provides experimental support for the 2011 ISO C++ standard. This support can be enabled with the -std=c++11 or -std=gnu++11 compiler options; the former disables GNU extensions.
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Garbage collection (automatic recycling of unreferenced regions of memory) is optional in C++; that is, a garbage collector is not a compulsory part of an implementation. However, C++11 provides a definition of what a GC can do if one is used and an ABI (Application Binary Interface) to help control its actions.
According to cppreference, full support of c++11 came with gcc 4.8.
The support for garbage collection is optional by the standard (see Bjarne Stroustrup C++11 FAQ). Therefore, GCC 4.8.1 is feature complete since it implements all the mandatory core parts of the standard.
The comments proved my answer unclear, I will be more specific: I was only talking about the core support for garbage collection. The library part is mandatory. The version of libstdc++ shipped with GCC 4.8.1 is not fully C++11-compliant (<regex> is not currently working for example), and the ABI for garbage collection is part of the missing features.
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