For reference, GCC 4.7 (released March 2012) was the last build of GCC that is written in C, and supports almost all of the C++11 language (4.8.1, written in C+

For reference, GCC 4.7 (released March 2012) was the last build of GCC that is written in C, and supports almost all of the C++11 language (4.8.1, written in C++, finished the last bits) and a fair amount of the library. If you have to work on a system that hasn't been updated since 2014 or so (since it's fair enough to avoid the .0 releases), getting support for later C++ standards is significantly more complicated.