[Bug fortran/76490] when use -O2 -fcheck-founds compiler appears to hang and consumes all memory

[urbanjost at comcast dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=76490

--- Comment #1 from urbanjost at comcast dot net ---
Created attachment 39433
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39433&action=edit
Smallest version of problem I could generate to reproduce problem