Depends on the compiler. In my very limited experience I've found that Clang is far superior to GCC in this matter (but rustc is better still, apart from iterator errors)
I am curious about which GCC, G++ version you have in mind. Clang definitely took the lead, but by GCC caught up and I prefer GCC's do Clang. But even I am behind the bleeding edge quite a bit so not sure how things stand now.
