> Also, I'm not sure how GCC compares.
Not favorably. Both projects have massive "backlogs," by naive metrics.
Maintainers for both are in a double bind: people get mad when you close their years-old issues because they can't be reproduced anymore, and people give you grief for not closing issues.
I don't have a point with this other that it's surprising (for end-users like me). Also, I'm not sure how GCC compares.