A few important, production C++ codebases do use tracing mark/sweep GC. Most famously: Chrome does (Oilpan), GCC does (or did), Unreal does (for core game stat

A few important, production C++ codebases do use tracing mark/sweep GC. Most famously: Chrome does (Oilpan), GCC does (or did), Unreal does (for core game state heaps), I think WebKit also does.