[Bug c++/67075] Infinite GC loop with ggc-min-expand=0

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67075

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Sounds more like ggc_collect is now always doing the gc and there are a lot of
ggc_collect calls. 

So what is happening we are close to your 32M limit you set, so any garbage
that is produced in a pass will cause the next call to ggc_collect to always
collect. This means there a lot of calls to ggc_collect but in the normal case
(non 0 case), it does not matter. 

You might want to try 5.2 as 4.8.x is no longer supported and there have been
some memory reductions happened since 4.8.x.