[Bug middle-end/90930] Excessive memory consumption

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90930

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>The file also compiles well if –O2 is removed and all optimization flags described in https://gcc.gnu.org/onlinedocs/gcc-7.4.0/gcc/Optimize-Options.html#Optimize-Options

You did not read that fully:
Most optimizations are only enabled if an -O level is set on the command line.

So obviously not including -O will cause -O0 to be done and most of those
options also to be ignored.