Clang's scan-build supports C++ for a long time already.

Regarding gcc/g++, there seems to be support only for C. From https://gcc.gnu.org/wiki/DavidMalcolm/StaticAnalyzer:

> Initial implementation was added in GCC 10; major rewrite occurred in GCC 11. > Only C is currently supported (I hope to support C++ in GCC 13, but it is out-of-scope for GCC 12)

Looking forward to seeing C++ support added to it!