Works:
gcc-9 -c ./mastermind.ii
gcc-10 -c ./mastermind.ii
gcc-10 -O3 -c ./mastermind.ii

Hangs:
gcc-9 -O3 -c ./mastermind.ii

20.10 will be switching to gcc-10 by default soon, so I guess it's not
that critical and indeed there are fixes in the 10 branch in Ubuntu
already.

** Also affects: gcc-10 (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: gcc-10 (Ubuntu)
       Status: New => Fix Released

** Changed in: gcc-9 (Ubuntu)
       Status: New => Confirmed

** Changed in: gcc-9 (Ubuntu)
   Importance: Undecided => Low

** Changed in: ubuntu-power-systems
   Importance: Medium => Low

** Changed in: ubuntu-power-systems
       Status: Triaged => Incomplete

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https://bugs.launchpad.net/bugs/1883531

Title:
  build hangs for 2 hours with -03, yet succeeds with -O2 very quickly

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